diff options
Diffstat (limited to 'drivers/mtd/nand/imx_nfc.c')
| -rw-r--r-- | drivers/mtd/nand/imx_nfc.c | 8286 |
1 files changed, 8286 insertions, 0 deletions
diff --git a/drivers/mtd/nand/imx_nfc.c b/drivers/mtd/nand/imx_nfc.c new file mode 100644 index 000000000000..65f72b4e468a --- /dev/null +++ b/drivers/mtd/nand/imx_nfc.c @@ -0,0 +1,8286 @@ +/* + * Copyright 2009 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/interrupt.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/mtd/partitions.h> +#include <linux/io.h> + +#define DRIVER_VERSION "1.0" + +/* Define this macro to enable event reporting. */ + +#define EVENT_REPORTING + +/* + * For detailed information that will be helpful in understanding this driver, + * see: + * + * Documentation/imx_nfc.txt + */ + +/* + * Macros that describe NFC hardware have names of the form: + * + * NFC_* + * + * Macros that apply only to specific versions of the NFC have names of the + * following form: + * + * NFC_<M>_<N>_* + * + * where: + * + * <M> is the major version of the NFC hardware. + * <N> is the minor version of the NFC hardware. + * + * The minor version can be 'X', which means that the macro applies to *all* + * NFCs of the same major version. + * + * For NFC versions with only one set of registers, macros that give offsets + * against the base address have names of the form: + * + * *<RegisterName>_REG_OFF + * + * Macros that give the position of a field's LSB within a given register have + * names of the form: + * + * *<RegisterName>_<FieldName>_POS + * + * Macros that mask a field within a given register have names of the form: + * + * *<RegisterName>_<FieldName>_MSK + */ + +/* + * Macro definitions for ALL NFC versions. + */ + +#define NFC_MAIN_BUF_SIZE (512) + +/* + * Macro definitions for version 1.0 NFCs. + */ + +#define NFC_1_0_BUF_SIZE_REG_OFF (0x00) +#define NFC_1_0_BUF_ADDR_REG_OFF (0x04) +#define NFC_1_0_FLASH_ADDR_REG_OFF (0x06) +#define NFC_1_0_FLASH_CMD_REG_OFF (0x08) +#define NFC_1_0_CONFIG_REG_OFF (0x0A) +#define NFC_1_0_ECC_STATUS_RESULT_REG_OFF (0x0C) +#define NFC_1_0_RSLTMAIN_AREA_REG_OFF (0x0E) +#define NFC_1_0_RSLTSPARE_AREA_REG_OFF (0x10) +#define NFC_1_0_WRPROT_REG_OFF (0x12) +#define NFC_1_0_UNLOCKSTART_BLKADDR_REG_OFF (0x14) +#define NFC_1_0_UNLOCKEND_BLKADDR_REG_OFF (0x16) +#define NFC_1_0_NF_WRPRST_REG_OFF (0x18) + +#define NFC_1_0_CONFIG1_REG_OFF (0x1A) +#define NFC_1_0_CONFIG1_NF_CE_POS (7) +#define NFC_1_0_CONFIG1_NF_CE_MSK (0x1 << 7) + +#define NFC_1_0_CONFIG2_REG_OFF (0x1C) + +/* +* Macro definitions for version 2.X NFCs. +*/ + +#define NFC_2_X_FLASH_ADDR_REG_OFF (0x06) +#define NFC_2_X_FLASH_CMD_REG_OFF (0x08) +#define NFC_2_X_CONFIG_REG_OFF (0x0A) + +#define NFC_2_X_WR_PROT_REG_OFF (0x12) + +#define NFC_2_X_NF_WR_PR_ST_REG_OFF (0x18) + +#define NFC_2_X_CONFIG2_REG_OFF (0x1C) +#define NFC_2_X_CONFIG2_FCMD_POS (0) +#define NFC_2_X_CONFIG2_FCMD_MSK (0x1 << 0) +#define NFC_2_X_CONFIG2_FADD_POS (1) +#define NFC_2_X_CONFIG2_FADD_MSK (0x1 << 1) +#define NFC_2_X_CONFIG2_FDI_POS (2) +#define NFC_2_X_CONFIG2_FDI_MSK (0x1 << 2) +#define NFC_2_X_CONFIG2_FDO_POS (3) +#define NFC_2_X_CONFIG2_FDO_MSK (0x7 << 3) +#define NFC_2_X_CONFIG2_INT_POS (15) +#define NFC_2_X_CONFIG2_INT_MSK (0x1 << 15) + +/* +* Macro definitions for version 2.0 NFCs. +*/ + +#define NFC_2_0_BUF_ADDR_REG_OFF (0x04) +#define NFC_2_0_BUF_ADDR_RBA_POS (0) +#define NFC_2_0_BUF_ADDR_RBA_MSK (0xf << 0) + +#define NFC_2_0_ECC_STATUS_REG_OFF (0x0C) +#define NFC_2_0_ECC_STATUS_NOSER1_POS (0) +#define NFC_2_0_ECC_STATUS_NOSER1_MSK (0xF << 0) +#define NFC_2_0_ECC_STATUS_NOSER2_POS (4) +#define NFC_2_0_ECC_STATUS_NOSER2_MSK (0xF << 4) +#define NFC_2_0_ECC_STATUS_NOSER3_POS (8) +#define NFC_2_0_ECC_STATUS_NOSER3_MSK (0xF << 8) +#define NFC_2_0_ECC_STATUS_NOSER4_POS (12) +#define NFC_2_0_ECC_STATUS_NOSER4_MSK (0xF << 12) + +#define NFC_2_0_CONFIG1_REG_OFF (0x1A) +#define NFC_2_0_CONFIG1_SP_EN_POS (2) +#define NFC_2_0_CONFIG1_SP_EN_MSK (0x1 << 2) +#define NFC_2_0_CONFIG1_ECC_EN_POS (3) +#define NFC_2_0_CONFIG1_ECC_EN_MSK (0x1 << 3) +#define NFC_2_0_CONFIG1_INT_MSK_POS (4) +#define NFC_2_0_CONFIG1_INT_MSK_MSK (0x1 << 4) +#define NFC_2_0_CONFIG1_NF_BIG_POS (5) +#define NFC_2_0_CONFIG1_NF_BIG_MSK (0x1 << 5) +#define NFC_2_0_CONFIG1_NFC_RST_POS (6) +#define NFC_2_0_CONFIG1_NFC_RST_MSK (0x1 << 6) +#define NFC_2_0_CONFIG1_NF_CE_POS (7) +#define NFC_2_0_CONFIG1_NF_CE_MSK (0x1 << 7) +#define NFC_2_0_CONFIG1_ONE_CYLE_POS (8) +#define NFC_2_0_CONFIG1_ONE_CYLE_MSK (0x1 << 8) +#define NFC_2_0_CONFIG1_MLC_POS (9) +#define NFC_2_0_CONFIG1_MLC_MSK (0x1 << 9) + +#define NFC_2_0_UNLOCK_START_REG_OFF (0x14) +#define NFC_2_0_UNLOCK_END_REG_OFF (0x16) + +/* +* Macro definitions for version 2.1 NFCs. +*/ + +#define NFC_2_1_BUF_ADDR_REG_OFF (0x04) +#define NFC_2_1_BUF_ADDR_RBA_POS (0) +#define NFC_2_1_BUF_ADDR_RBA_MSK (0x7 << 0) +#define NFC_2_1_BUF_ADDR_CS_POS (4) +#define NFC_2_1_BUF_ADDR_CS_MSK (0x3 << 4) + +#define NFC_2_1_ECC_STATUS_REG_OFF (0x0C) +#define NFC_2_1_ECC_STATUS_NOSER1_POS (0) +#define NFC_2_1_ECC_STATUS_NOSER1_MSK (0xF << 0) +#define NFC_2_1_ECC_STATUS_NOSER2_POS (4) +#define NFC_2_1_ECC_STATUS_NOSER2_MSK (0xF << 4) +#define NFC_2_1_ECC_STATUS_NOSER3_POS (8) +#define NFC_2_1_ECC_STATUS_NOSER3_MSK (0xF << 8) +#define NFC_2_1_ECC_STATUS_NOSER4_POS (12) +#define NFC_2_1_ECC_STATUS_NOSER4_MSK (0xF << 12) + +#define NFC_2_1_CONFIG1_REG_OFF (0x1A) +#define NFC_2_1_CONFIG1_ECC_MODE_POS (0) +#define NFC_2_1_CONFIG1_ECC_MODE_MSK (0x1 << 0) +#define NFC_2_1_CONFIG1_DMA_MODE_POS (1) +#define NFC_2_1_CONFIG1_DMA_MODE_MSK (0x1 << 1) +#define NFC_2_1_CONFIG1_SP_EN_POS (2) +#define NFC_2_1_CONFIG1_SP_EN_MSK (0x1 << 2) +#define NFC_2_1_CONFIG1_ECC_EN_POS (3) +#define NFC_2_1_CONFIG1_ECC_EN_MSK (0x1 << 3) +#define NFC_2_1_CONFIG1_INT_MSK_POS (4) +#define NFC_2_1_CONFIG1_INT_MSK_MSK (0x1 << 4) +#define NFC_2_1_CONFIG1_NF_BIG_POS (5) +#define NFC_2_1_CONFIG1_NF_BIG_MSK (0x1 << 5) +#define NFC_2_1_CONFIG1_NFC_RST_POS (6) +#define NFC_2_1_CONFIG1_NFC_RST_MSK (0x1 << 6) +#define NFC_2_1_CONFIG1_NF_CE_POS (7) +#define NFC_2_1_CONFIG1_NF_CE_MSK (0x1 << 7) +#define NFC_2_1_CONFIG1_SYM_POS (8) +#define NFC_2_1_CONFIG1_SYM_MSK (0x1 << 8) +#define NFC_2_1_CONFIG1_PPB_POS (9) +#define NFC_2_1_CONFIG1_PPB_MSK (0x3 << 9) +#define NFC_2_1_CONFIG1_FP_INT_POS (11) +#define NFC_2_1_CONFIG1_FP_INT_MSK (0x1 << 11) + +#define NFC_2_1_UNLOCK_START_0_REG_OFF (0x20) +#define NFC_2_1_UNLOCK_END_0_REG_OFF (0x22) +#define NFC_2_1_UNLOCK_START_1_REG_OFF (0x24) +#define NFC_2_1_UNLOCK_END_1_REG_OFF (0x26) +#define NFC_2_1_UNLOCK_START_2_REG_OFF (0x28) +#define NFC_2_1_UNLOCK_END_2_REG_OFF (0x2A) +#define NFC_2_1_UNLOCK_START_3_REG_OFF (0x2C) +#define NFC_2_1_UNLOCK_END_3_REG_OFF (0x2E) + +/* +* Macro definitions for version 3.X NFCs. +*/ + +/* +* Macro definitions for version 3.1 NFCs. +*/ + +#define NFC_3_1_FLASH_ADDR_CMD_REG_OFF (0x00) +#define NFC_3_1_CONFIG1_REG_OFF (0x04) +#define NFC_3_1_ECC_STATUS_RESULT_REG_OFF (0x08) +#define NFC_3_1_LAUNCH_NFC_REG_OFF (0x0C) + +#define NFC_3_1_WRPROT_REG_OFF (0x00) +#define NFC_3_1_WRPROT_UNLOCK_BLK_ADD0_REG_OFF (0x04) +#define NFC_3_1_CONFIG2_REG_OFF (0x14) +#define NFC_3_1_IPC_REG_OFF (0x18) + +/* +* Macro definitions for version 3.2 NFCs. +*/ + +#define NFC_3_2_CMD_REG_OFF (0x00) + +#define NFC_3_2_ADD0_REG_OFF (0x04) +#define NFC_3_2_ADD1_REG_OFF (0x08) +#define NFC_3_2_ADD2_REG_OFF (0x0C) +#define NFC_3_2_ADD3_REG_OFF (0x10) +#define NFC_3_2_ADD4_REG_OFF (0x14) +#define NFC_3_2_ADD5_REG_OFF (0x18) +#define NFC_3_2_ADD6_REG_OFF (0x1C) +#define NFC_3_2_ADD7_REG_OFF (0x20) +#define NFC_3_2_ADD8_REG_OFF (0x24) +#define NFC_3_2_ADD9_REG_OFF (0x28) +#define NFC_3_2_ADD10_REG_OFF (0x2C) +#define NFC_3_2_ADD11_REG_OFF (0x30) + +#define NFC_3_2_CONFIG1_REG_OFF (0x34) +#define NFC_3_2_CONFIG1_SP_EN_POS (0) +#define NFC_3_2_CONFIG1_SP_EN_MSK (0x1 << 0) +#define NFC_3_2_CONFIG1_NF_CE_POS (1) +#define NFC_3_2_CONFIG1_NF_CE_MSK (0x1 << 1) +#define NFC_3_2_CONFIG1_RST_POS (2) +#define NFC_3_2_CONFIG1_RST_MSK (0x1 << 2) +#define NFC_3_2_CONFIG1_RBA_POS (4) +#define NFC_3_2_CONFIG1_RBA_MSK (0x7 << 4) +#define NFC_3_2_CONFIG1_ITER_POS (8) +#define NFC_3_2_CONFIG1_ITER_MSK (0xf << 8) +#define NFC_3_2_CONFIG1_CS_POS (12) +#define NFC_3_2_CONFIG1_CS_MSK (0x7 << 12) +#define NFC_3_2_CONFIG1_STATUS_POS (16) +#define NFC_3_2_CONFIG1_STATUS_MSK (0xFFFF<<16) + +#define NFC_3_2_ECC_STATUS_REG_OFF (0x38) +#define NFC_3_2_ECC_STATUS_NOBER1_POS (0) +#define NFC_3_2_ECC_STATUS_NOBER1_MSK (0xF << 0) +#define NFC_3_2_ECC_STATUS_NOBER2_POS (4) +#define NFC_3_2_ECC_STATUS_NOBER2_MSK (0xF << 4) +#define NFC_3_2_ECC_STATUS_NOBER3_POS (8) +#define NFC_3_2_ECC_STATUS_NOBER3_MSK (0xF << 8) +#define NFC_3_2_ECC_STATUS_NOBER4_POS (12) +#define NFC_3_2_ECC_STATUS_NOBER4_MSK (0xF << 12) +#define NFC_3_2_ECC_STATUS_NOBER5_POS (16) +#define NFC_3_2_ECC_STATUS_NOBER5_MSK (0xF << 16) +#define NFC_3_2_ECC_STATUS_NOBER6_POS (20) +#define NFC_3_2_ECC_STATUS_NOBER6_MSK (0xF << 20) +#define NFC_3_2_ECC_STATUS_NOBER7_POS (24) +#define NFC_3_2_ECC_STATUS_NOBER7_MSK (0xF << 24) +#define NFC_3_2_ECC_STATUS_NOBER8_POS (28) +#define NFC_3_2_ECC_STATUS_NOBER8_MSK (0xF << 28) + + +#define NFC_3_2_STATUS_SUM_REG_OFF (0x3C) +#define NFC_3_2_STATUS_SUM_NAND_SUM_POS (0x0) +#define NFC_3_2_STATUS_SUM_NAND_SUM_MSK (0xFF << 0) +#define NFC_3_2_STATUS_SUM_ECC_SUM_POS (8) +#define NFC_3_2_STATUS_SUM_ECC_SUM_MSK (0xFF << 8) + +#define NFC_3_2_LAUNCH_REG_OFF (0x40) +#define NFC_3_2_LAUNCH_FCMD_POS (0) +#define NFC_3_2_LAUNCH_FCMD_MSK (0x1 << 0) +#define NFC_3_2_LAUNCH_FADD_POS (1) +#define NFC_3_2_LAUNCH_FADD_MSK (0x1 << 1) +#define NFC_3_2_LAUNCH_FDI_POS (2) +#define NFC_3_2_LAUNCH_FDI_MSK (0x1 << 2) +#define NFC_3_2_LAUNCH_FDO_POS (3) +#define NFC_3_2_LAUNCH_FDO_MSK (0x7 << 3) +#define NFC_3_2_LAUNCH_AUTO_PROG_POS (6) +#define NFC_3_2_LAUNCH_AUTO_PROG_MSK (0x1 << 6) +#define NFC_3_2_LAUNCH_AUTO_READ_POS (7) +#define NFC_3_2_LAUNCH_AUTO_READ_MSK (0x1 << 7) +#define NFC_3_2_LAUNCH_AUTO_ERASE_POS (9) +#define NFC_3_2_LAUNCH_AUTO_ERASE_MSK (0x1 << 9) +#define NFC_3_2_LAUNCH_COPY_BACK0_POS (10) +#define NFC_3_2_LAUNCH_COPY_BACK0_MSK (0x1 << 10) +#define NFC_3_2_LAUNCH_COPY_BACK1_POS (11) +#define NFC_3_2_LAUNCH_COPY_BACK1_MSK (0x1 << 11) +#define NFC_3_2_LAUNCH_AUTO_STATUS_POS (12) +#define NFC_3_2_LAUNCH_AUTO_STATUS_MSK (0x1 << 12) + +#define NFC_3_2_WRPROT_REG_OFF (0x00) +#define NFC_3_2_WRPROT_WPC_POS (0) +#define NFC_3_2_WRPROT_WPC_MSK (0x7 << 0) +#define NFC_3_2_WRPROT_CS2L_POS (3) +#define NFC_3_2_WRPROT_CS2L_MSK (0x7 << 3) +#define NFC_3_2_WRPROT_BLS_POS (6) +#define NFC_3_2_WRPROT_BLS_MSK (0x3 << 6) +#define NFC_3_2_WRPROT_LTS0_POS (8) +#define NFC_3_2_WRPROT_LTS0_MSK (0x1 << 8) +#define NFC_3_2_WRPROT_LS0_POS (9) +#define NFC_3_2_WRPROT_LS0_MSK (0x1 << 9) +#define NFC_3_2_WRPROT_US0_POS (10) +#define NFC_3_2_WRPROT_US0_MSK (0x1 << 10) +#define NFC_3_2_WRPROT_LTS1_POS (11) +#define NFC_3_2_WRPROT_LTS1_MSK (0x1 << 11) +#define NFC_3_2_WRPROT_LS1_POS (12) +#define NFC_3_2_WRPROT_LS1_MSK (0x1 << 12) +#define NFC_3_2_WRPROT_US1_POS (13) +#define NFC_3_2_WRPROT_US1_MSK (0x1 << 13) +#define NFC_3_2_WRPROT_LTS2_POS (14) +#define NFC_3_2_WRPROT_LTS2_MSK (0x1 << 14) +#define NFC_3_2_WRPROT_LS2_POS (15) +#define NFC_3_2_WRPROT_LS2_MSK (0x1 << 15) +#define NFC_3_2_WRPROT_US2_POS (16) +#define NFC_3_2_WRPROT_US2_MSK (0x1 << 16) +#define NFC_3_2_WRPROT_LTS3_POS (17) +#define NFC_3_2_WRPROT_LTS3_MSK (0x1 << 17) +#define NFC_3_2_WRPROT_LS3_POS (18) +#define NFC_3_2_WRPROT_LS3_MSK (0x1 << 18) +#define NFC_3_2_WRPROT_US3_POS (19) +#define NFC_3_2_WRPROT_US3_MSK (0x1 << 19) +#define NFC_3_2_WRPROT_LTS4_POS (20) +#define NFC_3_2_WRPROT_LTS4_MSK (0x1 << 20) +#define NFC_3_2_WRPROT_LS4_POS (21) +#define NFC_3_2_WRPROT_LS4_MSK (0x1 << 21) +#define NFC_3_2_WRPROT_US4_POS (22) +#define NFC_3_2_WRPROT_US4_MSK (0x1 << 22) +#define NFC_3_2_WRPROT_LTS5_POS (23) +#define NFC_3_2_WRPROT_LTS5_MSK (0x1 << 23) +#define NFC_3_2_WRPROT_LS5_POS (24) +#define NFC_3_2_WRPROT_LS5_MSK (0x1 << 24) +#define NFC_3_2_WRPROT_US5_POS (25) +#define NFC_3_2_WRPROT_US5_MSK (0x1 << 25) +#define NFC_3_2_WRPROT_LTS6_POS (26) +#define NFC_3_2_WRPROT_LTS6_MSK (0x1 << 26) +#define NFC_3_2_WRPROT_LS6_POS (27) +#define NFC_3_2_WRPROT_LS6_MSK (0x1 << 27) +#define NFC_3_2_WRPROT_US6_POS (28) +#define NFC_3_2_WRPROT_US6_MSK (0x1 << 28) +#define NFC_3_2_WRPROT_LTS7_POS (29) +#define NFC_3_2_WRPROT_LTS7_MSK (0x1 << 29) +#define NFC_3_2_WRPROT_LS7_POS (30) +#define NFC_3_2_WRPROT_LS7_MSK (0x1 << 30) +#define NFC_3_2_WRPROT_US7_POS (31) +#define NFC_3_2_WRPROT_US7_MSK (0x1 << 31) + +#define NFC_3_2_UNLOCK_BLK_ADD0_REG_OFF (0x04) +#define NFC_3_2_UNLOCK_BLK_ADD0_USBA0_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD0_USBA0_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD0_UEBA0_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD0_UEBA0_MSK (0xFFFF<<16) + +#define NFC_3_2_UNLOCK_BLK_ADD1_REG_OFF (0x08) +#define NFC_3_2_UNLOCK_BLK_ADD1_USBA1_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD1_USBA1_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD1_UEBA1_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD1_UEBA1_MSK (0xFFFF<<16) + +#define NFC_3_2_UNLOCK_BLK_ADD2_REG_OFF (0x0C) +#define NFC_3_2_UNLOCK_BLK_ADD2_USBA2_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD2_USBA2_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD2_UEBA2_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD2_UEBA2_MSK (0xFFFF<<16) + +#define NFC_3_2_UNLOCK_BLK_ADD3_REG_OFF (0x10) +#define NFC_3_2_UNLOCK_BLK_ADD3_USBA3_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD3_USBA3_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD3_UEBA3_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD3_UEBA3_MSK (0xFFFF<<16) + +#define NFC_3_2_UNLOCK_BLK_ADD4_REG_OFF (0x14) +#define NFC_3_2_UNLOCK_BLK_ADD4_USBA4_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD4_USBA4_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD4_UEBA4_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD4_UEBA4_MSK (0xFFFF<<16) + +#define NFC_3_2_UNLOCK_BLK_ADD5_REG_OFF (0x18) +#define NFC_3_2_UNLOCK_BLK_ADD5_USBA5_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD5_USBA5_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD5_UEBA5_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD5_UEBA5_MSK (0xFFFF<<16) + +#define NFC_3_2_UNLOCK_BLK_ADD6_REG_OFF (0x1C) +#define NFC_3_2_UNLOCK_BLK_ADD6_USBA6_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD6_USBA6_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD6_UEBA6_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD6_UEBA6_MSK (0xFFFF<<16) + +#define NFC_3_2_UNLOCK_BLK_ADD7_REG_OFF (0x20) +#define NFC_3_2_UNLOCK_BLK_ADD7_USBA7_POS (0) +#define NFC_3_2_UNLOCK_BLK_ADD7_USBA7_MSK (0xFFFF << 0) +#define NFC_3_2_UNLOCK_BLK_ADD7_UEBA7_POS (16) +#define NFC_3_2_UNLOCK_BLK_ADD7_UEBA7_MSK (0xFFFF<<16) + +#define NFC_3_2_CONFIG2_REG_OFF (0x24) +#define NFC_3_2_CONFIG2_PS_POS (0) +#define NFC_3_2_CONFIG2_PS_MSK (0x3 << 0) +#define NFC_3_2_CONFIG2_SYM_POS (2) +#define NFC_3_2_CONFIG2_SYM_MSK (0x1 << 2) +#define NFC_3_2_CONFIG2_ECC_EN_POS (3) +#define NFC_3_2_CONFIG2_ECC_EN_MSK (0x1 << 3) +#define NFC_3_2_CONFIG2_CMD_PHASES_POS (4) +#define NFC_3_2_CONFIG2_CMD_PHASES_MSK (0x1 << 4) +#define NFC_3_2_CONFIG2_ADDR_PHASES0_POS (5) +#define NFC_3_2_CONFIG2_ADDR_PHASES0_MSK (0x1 << 5) +#define NFC_3_2_CONFIG2_ECC_MODE_POS (6) +#define NFC_3_2_CONFIG2_ECC_MODE_MSK (0x1 << 6) +#define NFC_3_2_CONFIG2_PPB_POS (7) +#define NFC_3_2_CONFIG2_PPB_MSK (0x3 << 7) +#define NFC_3_2_CONFIG2_EDC_POS (9) +#define NFC_3_2_CONFIG2_EDC_MSK (0x7 << 9) +#define NFC_3_2_CONFIG2_ADDR_PHASES1_POS (12) +#define NFC_3_2_CONFIG2_ADDR_PHASES1_MSK (0x3 << 12) +#define NFC_3_2_CONFIG2_AUTO_DONE_MSK_POS (14) +#define NFC_3_2_CONFIG2_AUTO_DONE_MSK_MSK (0x1 << 14) +#define NFC_3_2_CONFIG2_INT_MSK_POS (15) +#define NFC_3_2_CONFIG2_INT_MSK_MSK (0x1 << 15) +#define NFC_3_2_CONFIG2_SPAS_POS (16) +#define NFC_3_2_CONFIG2_SPAS_MSK (0xFF << 16) +#define NFC_3_2_CONFIG2_ST_CMD_POS (24) +#define NFC_3_2_CONFIG2_ST_CMD_MSK (0xFF << 24) + +#define NFC_3_2_CONFIG3_REG_OFF (0x28) +#define NFC_3_2_CONFIG3_ADD_OP_POS (0) +#define NFC_3_2_CONFIG3_ADD_OP_MSK (0x3 << 0) +#define NFC_3_2_CONFIG3_TOO_POS (2) +#define NFC_3_2_CONFIG3_TOO_MSK (0x1 << 2) +#define NFC_3_2_CONFIG3_FW_POS (3) +#define NFC_3_2_CONFIG3_FW_MSK (0x1 << 3) +#define NFC_3_2_CONFIG3_SB2R_POS (4) +#define NFC_3_2_CONFIG3_SB2R_MSK (0x7 << 4) +#define NFC_3_2_CONFIG3_NF_BIG_POS (7) +#define NFC_3_2_CONFIG3_NF_BIG_MSK (0x1 << 7) +#define NFC_3_2_CONFIG3_SBB_POS (8) +#define NFC_3_2_CONFIG3_SBB_MSK (0x7 << 8) +#define NFC_3_2_CONFIG3_DMA_MODE_POS (11) +#define NFC_3_2_CONFIG3_DMA_MODE_MSK (0x1 << 11) +#define NFC_3_2_CONFIG3_NUM_OF_DEVICES_POS (12) +#define NFC_3_2_CONFIG3_NUM_OF_DEVICES_MSK (0x7 << 12) +#define NFC_3_2_CONFIG3_RBB_MODE_POS (15) +#define NFC_3_2_CONFIG3_RBB_MODE_MSK (0x1 << 15) +#define NFC_3_2_CONFIG3_FMP_POS (16) +#define NFC_3_2_CONFIG3_FMP_MSK (0xF << 16) +#define NFC_3_2_CONFIG3_NO_SDMA_POS (20) +#define NFC_3_2_CONFIG3_NO_SDMA_MSK (0x1 << 20) + +#define NFC_3_2_IPC_REG_OFF (0x2C) +#define NFC_3_2_IPC_CREQ_POS (0) +#define NFC_3_2_IPC_CREQ_MSK (0x1 << 0) +#define NFC_3_2_IPC_CACK_POS (1) +#define NFC_3_2_IPC_CACK_MSK (0x1 << 1) +#define NFC_3_2_IPC_DMA_STATUS_POS (26) +#define NFC_3_2_IPC_DMA_STATUS_MSK (0x3 << 26) +#define NFC_3_2_IPC_RB_B_POS (28) +#define NFC_3_2_IPC_RB_B_MSK (0x1 << 28) +#define NFC_3_2_IPC_LPS_POS (29) +#define NFC_3_2_IPC_LPS_MSK (0x1 << 29) +#define NFC_3_2_IPC_AUTO_PROG_DONE_POS (30) +#define NFC_3_2_IPC_AUTO_PROG_DONE_MSK (0x1 << 30) +#define NFC_3_2_IPC_INT_POS (31) +#define NFC_3_2_IPC_INT_MSK (0x1 << 31) + +#define NFC_3_2_AXI_ERR_ADD_REG_OFF (0x30) + +/** + * enum override - Choices for overrides. + * + * Some functions of this driver can be overriden at run time. This is a + * convenient enumerated type for all such options. + */ + +enum override { + NEVER = -1, + DRIVER_CHOICE = 0, + ALWAYS = 1, +}; + +/** + * struct physical_geometry - Physical geometry description. + * + * This structure describes the physical geometry of the medium. + * + * @chip_count: The number of chips in the medium. + * @chip_size: The size, in bytes, of a single chip (excluding the + * out-of-band bytes). + * @block_size: The size, in bytes, of a single block (excluding the + * out-of-band bytes). + * @page_data_size: The size, in bytes, of the data area in a page (excluding + * the out-of-band bytes). + * @page_oob_size: The size, in bytes, of the out-of-band area in a page. + */ + +struct physical_geometry { + unsigned int chip_count; + uint64_t chip_size; + unsigned int block_size; + unsigned int page_data_size; + unsigned int page_oob_size; +}; + +/** + * struct nfc_geometry - NFC geometry description. + * + * This structure describes the NFC's view of the medium geometry, which may be + * different from the physical geometry (for example, we treat pages that are + * physically 2K+112 as if they are 2K+64). + * + * @page_data_size: The size of the data area in a page (excluding the + * out-of-band bytes). This is almost certain to be the same + * as the physical data size. + * @page_oob_size: The size of the out-of-band area in a page. This may be + * different from the physical OOB size. + * @ecc_algorithm: The name of the ECC algorithm (e.g., "Reed-Solomon" or + * "BCH"). + * @ecc_strength: A number that describes the strength of the ECC algorithm. + * For example, various i.MX SoC's support ECC-1, ECC-4 or + * ECC-8 of the Reed-Solomon ECC algorithm. + * @buffer_count: The number of main/spare buffers used with this geometry. + * @spare_buf_size: The number of bytes held in each spare buffer. + * @spare_buf_spill: The number of extra bytes held in the last spare buffer. + * @mtd_layout: The MTD layout that best matches the geometry described by + * the rest of this structure. The logical layer might not use + * this structure, especially when interleaving. + */ + +struct nfc_geometry { + const unsigned int page_data_size; + const unsigned int page_oob_size; + const char *ecc_algorithm; + const int ecc_strength; + const unsigned int buffer_count; + const unsigned int spare_buf_size; + const unsigned int spare_buf_spill; + struct nand_ecclayout mtd_layout; +}; + +/** + * struct logical_geometry - Logical geometry description. + * + * This structure describes the logical geometry we expose to MTD. This geometry + * may be different from the physical or NFC geometries, especially when + * interleaving. + * + * @chip_count: The number of chips in the medium. + * @chip_size: The size, in bytes, of a single chip (excluding the + * out-of-band bytes). + * @usable_size: The size, in bytes, of the medium that MTD can actually + * use. This may be less than the chip size multiplied by the + * number of chips. + * @block_size: The size, in bytes, of a single block (excluding the + * out-of-band bytes). + * @page_data_size: The size of the data area in a page (excluding the + * out-of-band bytes). + * @page_oob_size: The size of the out-of-band area in a page. + */ + +struct logical_geometry { + unsigned int chip_count; + uint32_t chip_size; + uint32_t usable_size; + unsigned int block_size; + unsigned int page_data_size; + unsigned int page_oob_size; + struct nand_ecclayout *mtd_layout; +}; + +/** + * struct imx_nfc_data - i.MX NFC per-device data. + * + * Note that the "device" managed by this driver represents the NAND Flash + * controller *and* the NAND Flash medium behind it. Thus, the per-device data + * structure has information about the controller, the chips to which it is + * connected, and properties of the medium as a whole. + * + * @dev: A pointer to the owning struct device. + * @pdev: A pointer to the owning struct platform_device. + * @pdata: A pointer to the device's platform data. + * @buffers: A pointer to the NFC buffers. + * @primary_regs: A pointer to the NFC primary registers. + * @secondary_regs: A pointer to the NFC secondary registers. + * @clock: A pointer to the NFC struct clk. + * @interrupt: The NFC interrupt number. + * @physical_geometry: A description of the medium's physical geometry. + * @nfc: A pointer to the NFC HAL. + * @nfc_geometry: A description of the medium geometry as viewed by the + * NFC. + * @done: The struct completion we use to handle interrupts. + * @logical_geometry: A description of the logical geometry exposed to MTD. + * @interrupt_override: Can override how the driver uses interrupts when + * waiting for the NFC. + * @auto_op_override: Can override whether the driver uses automatic NFC + * operations. + * @inject_ecc_error: Indicates that the driver should inject an ECC error in + * the next read operation that uses ECC. User space + * programs can set this value through the sysfs node of + * the same name. If this value is less than zero, the + * driver will inject an uncorrectable ECC error. If this + * value is greater than zero, the driver will inject that + * number of correctable errors, capped at whatever + * possible maximum currently applies. + * @current_chip: The chip currently selected by the NAND Fash MTD HIL. + * A negative value indicates that no chip is selected. + * We use this field to detect when the HIL begins and + * ends essential transactions. This helps us to know when + * we should turn the NFC clock on or off. + * @command: The last command the HIL tried to send by calling + * cmdfunc(). Later functions use this information to + * adjust their behavior. The sentinel value ~0 indicates + * no command. + * @command_is_new: Indicates the command has just come down to cmdfunc() + * from the HIL and hasn't yet been handled. Other + * functions use this to adjust their behavior. + * @page_address: The current page address of interest. For reads, this + * information arrives in calls to cmdfunc(), but we don't + * actually use it until later. + * @nand: The data structure that represents this NAND Flash + * medium to the MTD NAND Flash system. + * @mtd: The data structure that represents this NAND Flash + * medium to MTD. + * @partitions: A pointer to a set of partitions collected from one of + * several possible sources (e.g., the boot loader, the + * kernel command line, etc.). See the global variable + * partition_source_types for the list of partition + * sources we examine. If this member is NULL, then no + * partitions were discovered. + * @partition_count: The number of discovered partitions. + */ + +struct imx_nfc_data { + + /* System Interface */ + struct device *dev; + struct platform_device *pdev; + + /* Platform Configuration */ + struct imx_nfc_platform_data *pdata; + void *buffers; + void *primary_regs; + void *secondary_regs; + struct clk *clock; + unsigned int interrupt; + + /* Flash Hardware */ + struct physical_geometry physical_geometry; + + /* NFC HAL and NFC Utilities */ + struct nfc_hal *nfc; + struct nfc_geometry *nfc_geometry; + struct completion done; + + /* Medium Abstraction Layer */ + struct logical_geometry logical_geometry; + enum override interrupt_override; + enum override auto_op_override; + int inject_ecc_error; + + /* MTD Interface Layer */ + int current_chip; + unsigned int command; + int command_is_new; + int page_address; + + /* NAND Flash MTD */ + struct nand_chip nand; + + /* MTD */ + struct mtd_info mtd; + struct mtd_partition *partitions; + unsigned int partition_count; + +}; + +/** + * struct nfc_hal - i.MX NFC HAL + * + * This structure embodies an abstract interface to the underlying NFC hardware. + * + * @major_version: The major version number of the NFC to which this + * structure applies. + * @minor_version: The minor version number of the NFC to which this + * structure applies. + * @max_chip_count: The maximum number of chips the NFC can possibly + * support. This may *not* be the actual number of chips + * currently connected. This value is constant for NFC's + * of a given version. + * @max_buffer_count: The number of main/spare buffers available in the NFC's + * memory. This value is constant for NFC's of a given + * version. + * @spare_buf_stride: The stride, in bytes, from the beginning of one spare + * buffer to the beginning of the next one. This value is + * constant for NFC's of a given version. + * @has_secondary_regs: Indicates if the NFC has a secondary register set that + * must be mapped in. + * @can_be_symmetric: Indicates if the NFC supports a "symmetric" clock. When + * the clock is "symmetric," the hardware waits one NFC + * clock for every read/write cycle. When the clock is + * "asymmetric," the hardware waits two NFC clocks for + * every read/write cycle. + * @init: Initializes the NFC and any version-specific data + * structures. This function will be called after + * everything has been set up for communication with the + * NFC itself, but before the platform has set up off-chip + * communication. Thus, this function must not attempt to + * communicate with the NAND Flash hardware. A non-zero + * return value indicates failure. + * @set_geometry: Based on the physical geometry, this function selects + * an NFC geometry structure and configures the NFC + * hardware to match. A non-zero return value indicates + * failure. + * @exit: Shuts down the NFC and cleans up version-specific data + * structures. This function will be called after the + * platform has shut down off-chip communication but while + * communication with the NFC still works. + * @set_closest_cycle: Configures the hardware to make the NAND Flash bus + * cycle period as close as possible to the given cycle + * period. This function is called during boot up and may + * assume that, at the time it's called, the parent clock + * is running at the highest rate it will ever run. Thus, + * this function need never worry that the NAND Flash bus + * will run faster and potentially make it impossible to + * communicate with the NAND Flash device -- it will only + * run slower. + * @mask_interrupt: Masks the NFC's interrupt. + * @unmask_interrupt: Unmasks the NFC's interrupt. + * @clear_interrupt: Clears the NFC's interrupt. + * @is_interrupting: Returns true if the NFC is interrupting. + * @is_ready: Returns true if all the chips in the medium are ready. + * This member may be set to NULL, which indicates that + * the underlying NFC hardware doesn't expose ready/busy + * signals. + * @set_force_ce: If passed true, forces the hardware chip enable signal + * for the current chip to be asserted always. If passed + * false, causes the chip enable signal to be asserted + * only during I/O. + * @set_ecc: Sets ECC on or off. + * @get_ecc_status: Examines the hardware ECC status and returns: + * == 0 => No errors. + * > 0 => The number of corrected errors. + * < 0 => There were uncorrectable errors. + * @get_symmetric: Gets the current symmetric clock setting. For versions + * that don't support symmetric clocks, this function + * always returns false. + * @set_symmetric: For versions that support symmetric clocks, sets + * whether or not the clock is symmetric. + * @select_chip: Selects the current chip. + * @command_cycle: Sends a command code and then returns immediately + * *without* waiting for the NFC to finish. + * @write_cycle: Applies a single write cycle to the current chip, + * sending the given byte, and waiting for the NFC to + * finish. + * @read_cycle: Applies a single read cycle to the current chip and + * returns the result, necessarily waiting for the NFC to + * finish. The width of the result is the same as the + * width of the Flash bus. + * @read_page: Applies read cycles to the current chip to read an + * entire page into the NFC. Note that ECC is enabled or + * disabled with the set_ecc function pointer (see above). + * This function waits for the NFC to finish before + * returning. + * @send_page: Applies write cycles to send an entire page from the + * NFC to the current chip. Note that ECC is enabled or + * disabled with the set_ecc function pointer (see above). + * This function waits for the NFC to finish before + * returning. + * @start_auto_read: Starts an automatic read operation. A NULL pointer + * indicates automatic read operations aren't available + * with this NFC version. + * @wait_for_auto_read: Blocks until an automatic read operation is ready for + * the CPU to copy a page out of the NFC. + * @resume_auto_read: Resumes an automatic read operation after the CPU has + * copied a page out. + * @start_auto_write: Starts an automatic write operation. A NULL pointer + * indicates automatic write operations aren't available + * with this NFC version. + * @wait_for_auto_write: Blocks until an automatic write operation is ready for + * the CPU to copy a page into the NFC. + * @start_auto_erase: Starts an automatic erase operation. A NULL pointer + * indicates automatic erase operations aren't available + * with this NFC version. + */ + +struct nfc_hal { + const unsigned int major_version; + const unsigned int minor_version; + const unsigned int max_chip_count; + const unsigned int max_buffer_count; + const unsigned int spare_buf_stride; + const int has_secondary_regs; + const int can_be_symmetric; + int (*init) (struct imx_nfc_data *); + int (*set_geometry) (struct imx_nfc_data *); + void (*exit) (struct imx_nfc_data *); + int (*set_closest_cycle) (struct imx_nfc_data *, unsigned ns); + void (*mask_interrupt) (struct imx_nfc_data *); + void (*unmask_interrupt) (struct imx_nfc_data *); + void (*clear_interrupt) (struct imx_nfc_data *); + int (*is_interrupting) (struct imx_nfc_data *); + int (*is_ready) (struct imx_nfc_data *); + void (*set_force_ce) (struct imx_nfc_data *, int on); + void (*set_ecc) (struct imx_nfc_data *, int on); + int (*get_ecc_status) (struct imx_nfc_data *); + int (*get_symmetric) (struct imx_nfc_data *); + void (*set_symmetric) (struct imx_nfc_data *, int on); + void (*select_chip) (struct imx_nfc_data *, int chip); + void (*command_cycle) (struct imx_nfc_data *, unsigned cmd); + void (*write_cycle) (struct imx_nfc_data *, unsigned byte); + unsigned (*read_cycle) (struct imx_nfc_data *); + void (*read_page) (struct imx_nfc_data *); + void (*send_page) (struct imx_nfc_data *); + int (*start_auto_read) (struct imx_nfc_data *, + unsigned start, unsigned count, unsigned column, unsigned page); + int (*wait_for_auto_read) (struct imx_nfc_data *); + int (*resume_auto_read) (struct imx_nfc_data *); + int (*start_auto_write) (struct imx_nfc_data *, + unsigned start, unsigned count, unsigned column, unsigned page); + int (*wait_for_auto_write)(struct imx_nfc_data *); + int (*start_auto_erase) (struct imx_nfc_data *, + unsigned start, unsigned count, unsigned page); +}; + +/* + * This variable controls whether or not probing is enabled. If false, then + * the driver will refuse to probe. The "enable" module parameter controls the + * value of this variable. + */ + +static int imx_nfc_module_enable = true; + +#ifdef EVENT_REPORTING + +/* + * This variable controls whether the driver reports event information by + * printing to the console. The "report_events" module parameter controls the + * value of this variable. + */ + +static int imx_nfc_module_report_events; /* implicitly initialized false*/ + +#endif + +/* + * This variable potentially overrides the driver's choice to interleave. The + * "interleave_override" module parameter controls the value of this variable. + */ + +static enum override imx_nfc_module_interleave_override = DRIVER_CHOICE; + +/* + * When set, this variable forces the driver to use the bytewise copy functions + * to get data in and out of the NFC. This is intended for testing, not typical + * use. + */ + +static int imx_nfc_module_force_bytewise_copy; /* implicitly initialized false*/ + +/* + * The list of algorithms we use to get partition information from the + * environment. + */ + +#ifdef CONFIG_MTD_PARTITIONS +static const char *partition_source_types[] = { "cmdlinepart", NULL }; +#endif + +/* + * The following structures describe the NFC geometries we support. + * + * Notice that pieces of some structure definitions are commented out and edited + * because various parts of the MTD system can't handle the way our hardware + * formats the out-of-band area. + * + * Here are the problems: + * + * - struct nand_ecclayout expects no more than 64 ECC bytes. + * + * The eccpos member of struct nand_ecclayout can't hold more than 64 ECC + * byte positions. Some of our formats have more so, unedited, they won't + * even compile. We comment out all ECC byte positions after the 64th one. + * + * - struct nand_ecclayout expects no more than 8 free spans. + * + * The oobfree member of struct nand_ecclayout can't hold more than 8 free + * spans. Some of our formats have more so, unedited, they won't even + * compile. We comment out all free spans after the eighth one. + * + * - The MEMGETOOBSEL command in the mtdchar driver. + * + * The mtdchar ioctl command MEMGETOOBSEL checks the number of ECC bytes + * against the length of the eccpos array in struct nand_oobinfo + * (see include/mtd/mtd-abi.h). This array can handle up to 32 ECC bytes, + * but some of our formats have more. + * + * To make this work, we cap the value assigned to eccbytes at 32. + * + * Notice that struct nand_oobinfo, used by mtdchar, is *different* from the + * struct nand_ecclayout that MTD uses internally. The latter structure + * can accomodate up to 64 ECC byte positions. Thus, we declare up to 64 + * ECC byte positions here, even if the advertised number of ECC bytes is + * less. + * + * This command is obsolete and, if no one used it, we wouldn't care about + * this problem. Unfortunately The nandwrite program uses it, and everyone + * expects nandwrite to work (it's how everyone usually lays down their + * JFFS2 file systems). + */ + +static struct nfc_geometry nfc_geometry_512_16_RS_ECC1 = { + .page_data_size = 512, + .page_oob_size = 16, + .ecc_algorithm = "Reed-Solomon", + .ecc_strength = 1, + .buffer_count = 1, + .spare_buf_size = 16, + .spare_buf_spill = 0, + .mtd_layout = { + .eccbytes = 5, + .eccpos = {6, 7, 8, 9, 10}, + .oobavail = 11, + .oobfree = { {0, 6}, {11, 5} }, + } +}; + +static struct nfc_geometry nfc_geometry_512_16_RS_ECC4 = { + .page_data_size = 512, + .page_oob_size = 16, + .ecc_algorithm = "Reed-Solomon", + .ecc_strength = 4, + .buffer_count = 1, + .spare_buf_size = 16, + .spare_buf_spill = 0, + .mtd_layout = { + .eccbytes = 9, + .eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15}, + .oobavail = 7, + .oobfree = { {0, 7} }, + } +}; + +static struct nfc_geometry nfc_geometry_512_16_BCH_ECC4 = { + .page_data_size = 512, + .page_oob_size = 16, + .ecc_algorithm = "BCH", + .ecc_strength = 4, + .buffer_count = 1, + .spare_buf_size = 16, + .spare_buf_spill = 0, + .mtd_layout = { + .eccbytes = 8, + .eccpos = {8, 9, 10, 11, 12, 13, 14, 15}, + .oobavail = 8, + .oobfree = { {0, 8} }, + } +}; + +static struct nfc_geometry nfc_geometry_2K_64_RS_ECC4 = { + .page_data_size = 2048, + .page_oob_size = 64, + .ecc_algorithm = "Reed-Solomon", + .ecc_strength = 4, + .buffer_count = 4, + .spare_buf_size = 16, + .spare_buf_spill = 0, + .mtd_layout = { + .eccbytes = 32 /*9 * 4*/, /* See notes above. */ + .eccpos = { + + (0*16)+7 , (0*16)+8 , (0*16)+9 , (0*16)+10, (0*16)+11, + (0*16)+12, (0*16)+13, (0*16)+14, (0*16)+15, + + (1*16)+7 , (1*16)+8 , (1*16)+9 , (1*16)+10, (1*16)+11, + (1*16)+12, (1*16)+13, (1*16)+14, (1*16)+15, + + (2*16)+7 , (2*16)+8 , (2*16)+9 , (2*16)+10, (2*16)+11, + (2*16)+12, (2*16)+13, (2*16)+14, (2*16)+15, + + (3*16)+7 , (3*16)+8 , (3*16)+9 , (3*16)+10, (3*16)+11, + (3*16)+12, (3*16)+13, (3*16)+14, (3*16)+15, + + }, + .oobavail = 7 * 4, + .oobfree = { + {(0*16)+0, 7}, + {(1*16)+0, 7}, + {(2*16)+0, 7}, + {(3*16)+0, 7}, + }, + } +}; + +static struct nfc_geometry nfc_geometry_2K_64_BCH_ECC4 = { + .page_data_size = 2048, + .page_oob_size = 64, + .ecc_algorithm = "BCH", + .ecc_strength = 4, + .buffer_count = 4, + .spare_buf_size = 16, + .spare_buf_spill = 0, + .mtd_layout = { + .eccbytes = 8 * 4, + .eccpos = { + + (0*16)+8 , (0*16)+9 , (0*16)+10, (0*16)+11, + (0*16)+12, (0*16)+13, (0*16)+14, (0*16)+15, + + (1*16)+8 , (1*16)+9 , (1*16)+10, (1*16)+11, + (1*16)+12, (1*16)+13, (1*16)+14, (1*16)+15, + + (2*16)+8 , (2*16)+9 , (2*16)+10, (2*16)+11, + (2*16)+12, (2*16)+13, (2*16)+14, (2*16)+15, + + (3*16)+8 , (3*16)+9 , (3*16)+10, (3*16)+11, + (3*16)+12, (3*16)+13, (3*16)+14, (3*16)+15, + + }, + .oobavail = 8 * 4, + .oobfree = { + {(0*16)+0, 8}, + {(1*16)+0, 8}, + {(2*16)+0, 8}, + {(3*16)+0, 8}, + }, + } +}; + +static struct nfc_geometry nfc_geometry_4K_128_BCH_ECC4 = { + .page_data_size = 4096, + .page_oob_size = 128, + .ecc_algorithm = "BCH", + .ecc_strength = 4, + .buffer_count = 8, + .spare_buf_size = 16, + .spare_buf_spill = 0, + .mtd_layout = { + .eccbytes = 8 * 8, + .eccpos = { + + (0*16)+8 , (0*16)+9 , (0*16)+10, (0*16)+11, + (0*16)+12, (0*16)+13, (0*16)+14, (0*16)+15, + + (1*16)+8 , (1*16)+9 , (1*16)+10, (1*16)+11, + (1*16)+12, (1*16)+13, (1*16)+14, (1*16)+15, + + (2*16)+8 , (2*16)+9 , (2*16)+10, (2*16)+11, + (2*16)+12, (2*16)+13, (2*16)+14, (2*16)+15, + + (3*16)+8 , (3*16)+9 , (3*16)+10, (3*16)+11, + (3*16)+12, (3*16)+13, (3*16)+14, (3*16)+15, + + (4*16)+8 , (4*16)+9 , (4*16)+10, (4*16)+11, + (4*16)+12, (4*16)+13, (4*16)+14, (4*16)+15, + + (5*16)+8 , (5*16)+9 , (5*16)+10, (5*16)+11, + (5*16)+12, (5*16)+13, (5*16)+14, (5*16)+15, + + (6*16)+8 , (6*16)+9 , (6*16)+10, (6*16)+11, + (6*16)+12, (6*16)+13, (6*16)+14, (6*16)+15, + + (7*16)+8 , (7*16)+9 , (7*16)+10, (7*16)+11, + (7*16)+12, (7*16)+13, (7*16)+14, (7*16)+15, + + }, + .oobavail = 8 * 8, + .oobfree = { + {(0*16)+0, 8}, + {(1*16)+0, 8}, + {(2*16)+0, 8}, + {(3*16)+0, 8}, + {(4*16)+0, 8}, + {(5*16)+0, 8}, + {(6*16)+0, 8}, + {(7*16)+0, 8}, + }, + } +}; + +static struct nfc_geometry nfc_geometry_4K_218_BCH_ECC8 = { + .page_data_size = 4096, + .page_oob_size = 218, + .ecc_algorithm = "BCH", + .ecc_strength = 8, + .buffer_count = 8, + .spare_buf_size = 26, + .spare_buf_spill = 10, + .mtd_layout = { + .eccbytes = 32 /*10 * 8*/, /* See notes above. */ + .eccpos = { + + (0*26)+12, (0*26)+13, (0*26)+14, (0*26)+15, (0*26)+16, + (0*26)+17, (0*26)+18, (0*26)+19, (0*26)+20, (0*26)+21, + + (1*26)+12, (1*26)+13, (1*26)+14, (1*26)+15, (1*26)+16, + (1*26)+17, (1*26)+18, (1*26)+19, (1*26)+20, (1*26)+21, + + (2*26)+12, (2*26)+13, (2*26)+14, (2*26)+15, (2*26)+16, + (2*26)+17, (2*26)+18, (2*26)+19, (2*26)+20, (2*26)+21, + + (3*26)+12, (3*26)+13, (3*26)+14, (3*26)+15, (3*26)+16, + (3*26)+17, (3*26)+18, (3*26)+19, (3*26)+20, (3*26)+21, + + (4*26)+12, (4*26)+13, (4*26)+14, (4*26)+15, (4*26)+16, + (4*26)+17, (4*26)+18, (4*26)+19, (4*26)+20, (4*26)+21, + + (5*26)+12, (5*26)+13, (5*26)+14, (5*26)+15, (5*26)+16, + (5*26)+17, (5*26)+18, (5*26)+19, (5*26)+20, (5*26)+21, + + (6*26)+12, (6*26)+13, (6*26)+14, (6*26)+15, + /* See notes above. + (6*26)+16, + (6*26)+17, (6*26)+18, (6*26)+19, (6*26)+20, (6*26)+21, + + (7*26)+12, (7*26)+13, (7*26)+14, (7*26)+15, (7*26)+16, + (7*26)+17, (7*26)+18, (7*26)+19, (7*26)+20, (7*26)+21, + */ + + }, + .oobavail = 96 /*(16 * 8) + 10*/, /* See notes above. */ + .oobfree = { + {(0*26)+0, 12}, {(0*26)+22, 4}, + {(1*26)+0, 12}, {(1*26)+22, 4}, + {(2*26)+0, 12}, {(2*26)+22, 4}, + {(3*26)+0, 48}, /* See notes above. */ + /* See notes above. + {(3*26)+0, 12}, {(3*26)+22, 4}, + {(4*26)+0, 12}, {(4*26)+22, 4}, + {(5*26)+0, 12}, {(5*26)+22, 4}, + {(6*26)+0, 12}, {(6*26)+22, 4}, + {(7*26)+0, 12}, {(7*26)+22, 4 + 10}, + */ + }, + } +}; + +/* + * When the logical geometry differs from the NFC geometry (e.g., + * interleaving), we synthesize a layout rather than use the one that comes with + * the NFC geometry. See mal_set_logical_geometry(). + */ + +static struct nand_ecclayout synthetic_layout; + +/* + * These structures describe how the BBT code will find block marks in the OOB + * area of a page. Don't be confused by the fact that this is the same type used + * to describe bad block tables. Some of the same information is needed, so the + * designers use the same structure for two conceptually distinct functions. + */ + +static uint8_t block_mark_pattern[] = { 0xff, 0xff }; + +static struct nand_bbt_descr small_page_block_mark_descriptor = { + .options = NAND_BBT_SCAN2NDPAGE, + .offs = 5, + .len = 1, + .pattern = block_mark_pattern, +}; + +static struct nand_bbt_descr large_page_block_mark_descriptor = { + .options = NAND_BBT_SCAN2NDPAGE, + .offs = 0, + .len = 2, + .pattern = block_mark_pattern, +}; + +/* + * Bad block table descriptors for the main and mirror tables. + */ + +static uint8_t bbt_main_pattern[] = { 'B', 'b', 't', '0' }; +static uint8_t bbt_mirror_pattern[] = { '1', 't', 'b', 'B' }; + +static struct nand_bbt_descr bbt_main_descriptor = { + .options = + NAND_BBT_LASTBLOCK | + NAND_BBT_CREATE | + NAND_BBT_WRITE | + NAND_BBT_2BIT | + NAND_BBT_VERSION | + NAND_BBT_PERCHIP, + .offs = 0, + .len = 4, + .veroffs = 4, + .maxblocks = 4, + .pattern = bbt_main_pattern, +}; + +static struct nand_bbt_descr bbt_mirror_descriptor = { + .options = + NAND_BBT_LASTBLOCK | + NAND_BBT_CREATE | + NAND_BBT_WRITE | + NAND_BBT_2BIT | + NAND_BBT_VERSION | + NAND_BBT_PERCHIP, + .offs = 0, + .len = 4, + .veroffs = 4, + .maxblocks = 4, + .pattern = bbt_mirror_pattern, +}; + +#ifdef EVENT_REPORTING + +/** + * struct event - A single record in the event trace. + * + * @time: The time at which the event occurred. + * @nesting: Indicates function call nesting. + * @description: A description of the event. + */ + +struct event { + ktime_t time; + unsigned int nesting; + char *description; +}; + +/** + * The event trace. + * + * @overhead: The delay to take a time stamp and nothing else. + * @nesting: The current nesting level. + * @overflow: Indicates the trace overflowed. + * @next: Index of the next event to write. + * @events: The array of events. + */ + +#define MAX_EVENT_COUNT (200) + +static struct { + ktime_t overhead; + int nesting; + int overflow; + unsigned int next; + struct event events[MAX_EVENT_COUNT]; +} event_trace; + +/** + * reset_event_trace() - Resets the event trace. + */ +static void reset_event_trace(void) +{ + event_trace.nesting = 0; + event_trace.overflow = false; + event_trace.next = 0; +} + +/** + * add_event() - Adds an event to the event trace. + * + * @description: A description of the event. + * @delta: A delta to the nesting level for this event [-1, 0, 1]. + */ +static inline void add_event(char *description, int delta) +{ + struct event *event; + + if (!imx_nfc_module_report_events) + return; + + if (event_trace.overflow) + return; + + if (event_trace.next >= MAX_EVENT_COUNT) { + event_trace.overflow = true; + return; + } + + event = event_trace.events + event_trace.next; + + event->time = ktime_get(); + + event->description = description; + + if (!delta) + event->nesting = event_trace.nesting; + else if (delta < 0) { + event->nesting = event_trace.nesting - 1; + event_trace.nesting -= 2; + } else { + event->nesting = event_trace.nesting + 1; + event_trace.nesting += 2; + } + + if (event_trace.nesting < 0) + event_trace.nesting = 0; + + event_trace.next++; + +} + +/** + * add_state_event_l() - Adds an event to display some state. + * + * @address: The address to examine. + * @mask: A mask to apply to the contents of the given address. + * @clear: An event message to add if the result is zero. + * @not_zero: An event message to add if the result is not zero. + */ +static void add_state_event_l(void *address, uint32_t mask, + char *zero, char *not_zero) +{ + int state; + state = !!(__raw_readl(address) & mask); + if (state) + add_event(not_zero, 0); + else + add_event(zero, 0); +} + +/** + * start_event_trace() - Starts an event trace and adds the first event. + * + * @description: A description of the first event. + */ +static void start_event_trace(char *description) +{ + + ktime_t t0; + ktime_t t1; + + if (!imx_nfc_module_report_events) + return; + + reset_event_trace(); + + t0 = ktime_get(); + t1 = ktime_get(); + + event_trace.overhead = ktime_sub(t1, t0); + + add_event(description, 1); + +} + +/** + * dump_event_trace() - Dumps the event trace. + */ +static void dump_event_trace(void) +{ + unsigned int i; + time_t seconds; + long nanoseconds; + char line[100]; + int o; + struct event *first_event; + struct event *last_event; + struct event *matching_event; + struct event *event; + ktime_t delta; + + /* Check if event reporting is turned off. */ + + if (!imx_nfc_module_report_events) + return; + + /* Print important facts about this event trace. */ + + printk(KERN_DEBUG "\n+--------------\n"); + + printk(KERN_DEBUG "| Overhead : [%d:%d]\n", + event_trace.overhead.tv.sec, + event_trace.overhead.tv.nsec); + + if (!event_trace.next) { + printk(KERN_DEBUG "| No Events\n"); + return; + } + + first_event = event_trace.events; + last_event = event_trace.events + (event_trace.next - 1); + + delta = ktime_sub(last_event->time, first_event->time); + printk(KERN_DEBUG "| Elapsed Time: [%d:%d]\n", + delta.tv.sec, delta.tv.nsec); + + if (event_trace.overflow) + printk(KERN_DEBUG "| Overflow!\n"); + + /* Print the events in this history. */ + + for (i = 0, event = event_trace.events; + i < event_trace.next; i++, event++) { + + /* Get the delta between this event and the previous event. */ + + if (!i) { + seconds = 0; + nanoseconds = 0; + } else { + delta = ktime_sub(event[0].time, event[-1].time); + seconds = delta.tv.sec; + nanoseconds = delta.tv.nsec; + } + + /* Print the current event. */ + + o = 0; + + o = snprintf(line, sizeof(line) - o, "| [%ld:% 10ld]%*s %s", + seconds, nanoseconds, + event->nesting, "", + event->description); + /* Check if this is the last event in a nested series. */ + + if (i && (event[0].nesting < event[-1].nesting)) { + + for (matching_event = event - 1;; matching_event--) { + + if (matching_event < event_trace.events) { + matching_event = 0; + break; + } + + if (matching_event->nesting == event->nesting) + break; + + } + + if (matching_event) { + delta = ktime_sub(event->time, + matching_event->time); + o += snprintf(line + o, sizeof(line) - o, + " <%d:%d]", delta.tv.sec, + delta.tv.nsec); + } + + } + + /* Check if this is the first event in a nested series. */ + + if ((i < event_trace.next - 1) && + (event[0].nesting < event[1].nesting)) { + + for (matching_event = event + 1;; matching_event++) { + + if (matching_event >= + (event_trace.events+event_trace.next)) { + matching_event = 0; + break; + } + + if (matching_event->nesting == event->nesting) + break; + + } + + if (matching_event) { + delta = ktime_sub(matching_event->time, + event->time); + o += snprintf(line + o, sizeof(line) - o, + " [%d:%d>", delta.tv.sec, + delta.tv.nsec); + } + + } + + printk(KERN_DEBUG "%s\n", line); + + } + + printk(KERN_DEBUG "+--------------\n"); + +} + +/** + * stop_event_trace() - Stops an event trace. + * + * @description: A description of the last event. + */ +static void stop_event_trace(char *description) +{ + struct event *event; + + if (!imx_nfc_module_report_events) + return; + + /* + * We want the end of the trace, no matter what happens. If the trace + * has already overflowed, or is about to, just jam this event into the + * last spot. Otherwise, add this event like any other. + */ + + if (event_trace.overflow || (event_trace.next >= MAX_EVENT_COUNT)) { + event = event_trace.events + (MAX_EVENT_COUNT - 1); + event->time = ktime_get(); + event->description = description; + event->nesting = 0; + } else { + add_event(description, -1); + } + + dump_event_trace(); + reset_event_trace(); + +} + +#else /* EVENT_REPORTING */ + +#define start_event_trace(description) do {} while (0) +#define add_event(description, delta) do {} while (0) +#define add_state_event_l(address, mask, zero, not_zero) do {} while (0) +#define stop_event_trace(description) do {} while (0) +#define dump_event_trace() do {} while (0) + +#endif /* EVENT_REPORTING */ + +/** + * unimplemented() - Announces intentionally unimplemented features. + * + * @this: Per-device data. + * @msg: A message about the unimplemented feature. + */ +static inline void unimplemented(struct imx_nfc_data *this, const char * msg) +{ + dev_err(this->dev, "Intentionally unimplemented: %s", msg); +} + +/** + * raw_read_mask_w() - Reads masked bits in a 16-bit hardware register. + */ +static inline uint16_t raw_read_mask_w(uint16_t mask, void *address) +{ + return __raw_readw(address) & mask; +} + +/** + * raw_set_mask_w() - Sets bits in a 16-bit hardware register. + */ +static inline void raw_set_mask_w(uint16_t mask, void *address) +{ + __raw_writew(__raw_readw(address) | mask, address); +} + +/** + * raw_clr_mask_w() - Clears bits in a 16-bit hardware register. + */ +static inline void raw_clr_mask_w(uint16_t mask, void *address) +{ + __raw_writew(__raw_readw(address) & (~mask), address); +} + +/** + * raw_read_mask_l() - Reads masked bits in a 32-bit hardware register. + */ +static inline uint32_t raw_read_mask_l(uint32_t mask, void *address) +{ + return __raw_readl(address) & mask; +} + +/** + * raw_set_mask_l() - Sets bits in a 32-bit hardware register. + */ +static inline void raw_set_mask_l(uint32_t mask, void *address) +{ + __raw_writel(__raw_readl(address) | mask, address); +} + +/** + * raw_clr_mask_l() - Clears bits in a 32-bit hardware register. + */ +static inline void raw_clr_mask_l(uint32_t mask, void *address) +{ + __raw_writel(__raw_readl(address) & (~mask), address); +} + +/** + * is_large_page_chip() - Returns true for large page media. + * + * @this: Per-device data. + */ +static inline int is_large_page_chip(struct imx_nfc_data *this) +{ + return (this->physical_geometry.page_data_size > 512); +} + +/** + * is_small_page_chip() - Returns true for small page media. + * + * @this: Per-device data. + */ +static inline int is_small_page_chip(struct imx_nfc_data *this) +{ + return !is_large_page_chip(this); +} + +/** + * get_cycle_in_ns() - Returns the given device's cycle period, in ns. + * + * @this: Per-device data. + */ +static inline unsigned get_cycle_in_ns(struct imx_nfc_data *this) +{ + unsigned long cycle_in_ns; + + cycle_in_ns = 1000000000 / clk_get_rate(this->clock); + + if (!this->nfc->get_symmetric(this)) + cycle_in_ns *= 2; + + return cycle_in_ns; + +} + +/** + * nfc_util_set_best_cycle() - Sets the closest possible NAND Flash bus cycle. + * + * This function computes the clock setup that will best approximate the given + * target Flash bus cycle period. + * + * For some NFC versions, we can make the clock "symmetric." When the clock + * is "symmetric," the hardware waits one NFC clock for every read/write cycle. + * When the clock is "asymmetric," the hardware waits two NFC clocks for every + * read/write cycle. Thus, making the clock asymmetric essentially divides the + * NFC clock by two. + * + * We compute the target frequency that matches the given target period. We then + * discover the closest available match with that frequency and the closest + * available match with double that frequency (for use with an asymmetric + * clock). We implement the best choice of original clock and symmetric or + * asymmetric setting, preferring symmetric clocks. + * + * @this: Per-device data. + * @ns: The target cycle period, in nanoseconds. + * @no_asym: Disallow making the clock asymmetric. + * @no_sym: Disallow making the clock symmetric. + */ +static int nfc_util_set_best_cycle(struct imx_nfc_data *this, + unsigned int ns, int no_asym, int no_sym) +{ + unsigned long target_hz; + long symmetric_hz; + long symmetric_delta_hz; + long asymmetric_hz; + long asymmetric_delta_hz; + unsigned long best_hz; + int best_symmetry_setting; + struct device *dev = this->dev; + + /* The target cycle period must be greater than zero. */ + + if (!ns) + return -EINVAL; + + /* Compute the target frequency. */ + + target_hz = 1000000000 / ns; + + /* Find out how close we can get with a symmetric clock. */ + + if (!no_sym && this->nfc->can_be_symmetric) + symmetric_hz = clk_round_rate(this->clock, target_hz); + else + symmetric_hz = -EINVAL; + + /* Find out how close we can get with an asymmetric clock. */ + + if (!no_asym) + asymmetric_hz = clk_round_rate(this->clock, target_hz * 2); + else + asymmetric_hz = -EINVAL; + + /* Does anything work at all? */ + + if ((symmetric_hz == -EINVAL) && (asymmetric_hz == -EINVAL)) { + dev_err(dev, "Can't support Flash bus cycle of %uns\n", ns); + return -EINVAL; + } + + /* Discover the best match. */ + + if ((symmetric_hz != -EINVAL) && (asymmetric_hz != -EINVAL)) { + + symmetric_delta_hz = target_hz - symmetric_hz; + asymmetric_delta_hz = target_hz - (asymmetric_hz / 2); + + if (symmetric_delta_hz <= asymmetric_delta_hz) + best_symmetry_setting = true; + else + best_symmetry_setting = false; + + } else if (symmetric_hz != -EINVAL) { + best_symmetry_setting = true; + } else { + best_symmetry_setting = false; + } + + best_hz = best_symmetry_setting ? symmetric_hz : asymmetric_hz; + + /* Implement the best match. */ + + this->nfc->set_symmetric(this, best_symmetry_setting); + + return clk_set_rate(this->clock, best_hz); + +} + +/** + * nfc_util_wait_for_the_nfc() - Waits for the NFC to finish an operation. + * + * @this: Per-device data. + * @use_irq: Indicates that we should wait for an interrupt rather than polling + * and delaying. + */ +static void nfc_util_wait_for_the_nfc(struct imx_nfc_data *this, int use_irq) +{ + unsigned spin_count; + struct device *dev = this->dev; + + /* Apply the override, if any. */ + + switch (this->interrupt_override) { + + case NEVER: + use_irq = false; + break; + + case DRIVER_CHOICE: + break; + + case ALWAYS: + use_irq = true; + break; + + } + + /* Check if we're using interrupts. */ + + if (use_irq) { + + /* + * If control arrives here, the caller wants to use interrupts. + * Presumably, this operation is known to take a very long time. + */ + + if (this->nfc->is_interrupting(this)) { + add_event("Waiting for the NFC (early interrupt)", 1); + this->nfc->clear_interrupt(this); + } else { + add_event("Waiting for the NFC (interrupt)", 1); + this->nfc->unmask_interrupt(this); + wait_for_completion(&this->done); + } + + add_event("NFC done", -1); + + } else { + + /* + * If control arrives here, the caller doesn't want to use + * interrupts. Presumably, this operation is too quick to + * justify the overhead. Leave the interrupt masked, and loop + * until the interrupt bit lights up, or we time out. + * + * We spin for a maximum of about 2ms before declaring a time + * out. No operation we could possibly spin on should take that + * long. + */ + + spin_count = 2000; + + add_event("Waiting for the NFC (polling)", 1); + + for (; spin_count > 0; spin_count--) { + + if (this->nfc->is_interrupting(this)) { + this->nfc->clear_interrupt(this); + add_event("NFC done", -1); + return; + } + + udelay(1); + + } + + /* Timed out. */ + + add_event("Timed out", -1); + + dev_err(dev, "[wait_for_the_nfc] ===== Time Out =====\n"); + dump_event_trace(); + + } + +} + +/** + * nfc_util_bytewise_copy_from_nfc_mem() - Copies bytes from the NFC memory. + * + * @from: A pointer to the source memory. + * @to: A pointer to the destination memory. + * @size: The number of bytes to copy. + */ +static void nfc_util_bytewise_copy_from_nfc_mem(const void *from, + void *to, size_t n) +{ + unsigned int i; + const uint8_t *f = from; + uint8_t *t = to; + uint16_t *p; + uint16_t x; + + for (i = 0; i < n; i++, f++, t++) { + + p = (uint16_t *) (((unsigned long) f) & ~((unsigned long) 1)); + + x = __raw_readw(p); + + if (((unsigned long) f) & 0x1) + *t = (x >> 8) & 0xff; + else + *t = (x >> 0) & 0xff; + + } + +} + +/** + * nfc_util_bytewise_copy_to_nfc_mem() - Copies bytes to the NFC memory. + * + * @from: A pointer to the source memory. + * @to: A pointer to the destination memory. + * @size: The number of bytes to copy. + */ +static void nfc_util_bytewise_copy_to_nfc_mem(const void *from, + void *to, size_t n) +{ + unsigned int i; + const uint8_t *f = from; + uint8_t *t = to; + uint16_t *p; + uint16_t x; + + for (i = 0; i < n; i++, f++, t++) { + + p = (uint16_t *) (((unsigned long) t) & ~((unsigned long) 1)); + + x = __raw_readw(p); + + if (((unsigned long) t) & 0x1) + ((uint8_t *)(&x))[1] = *f; + else + ((uint8_t *)(&x))[0] = *f; + + __raw_writew(x, p); + + } + +} + +/** + * nfc_util_copy_from_nfc_mem() - Copies from the NFC memory to main memory. + * + * @from: A pointer to the source memory. + * @to: A pointer to the destination memory. + * @size: The number of bytes to copy. + */ +static void nfc_util_copy_from_nfc_mem(const void *from, void *to, size_t n) +{ + unsigned int chunk_count; + + /* + * Check if we're testing bytewise copies. + */ + + if (imx_nfc_module_force_bytewise_copy) + goto force_bytewise_copy; + + /* + * We'd like to use memcpy to get data out of the NFC but, because that + * memory responds only to 16- and 32-byte reads, we can only do so + * safely if both the start and end of both the source and destination + * are perfectly aligned on 4-byte boundaries. + */ + + if (!(((unsigned long) from) & 0x3) && !(((unsigned long) to) & 0x3)) { + + /* + * If control arrives here, both the source and destination are + * aligned on 4-byte boundaries. Compute the number of whole, + * 4-byte chunks we can move. + */ + + chunk_count = n / 4; + + /* + * Move all the chunks we can, and then update the pointers and + * byte count to show what's left. + */ + + if (chunk_count) { + memcpy(to, from, chunk_count * 4); + from += chunk_count * 4; + to += chunk_count * 4; + n -= chunk_count * 4; + } + + } + + /* + * Move what's left. + */ + +force_bytewise_copy: + + nfc_util_bytewise_copy_from_nfc_mem(from, to, n); + +} + +/** + * nfc_util_copy_to_nfc_mem() - Copies from main memory to the NFC memory. + * + * @from: A pointer to the source memory. + * @to: A pointer to the destination memory. + * @size: The number of bytes to copy. + */ +static void nfc_util_copy_to_nfc_mem(const void *from, void *to, size_t n) +{ + unsigned int chunk_count; + + /* + * Check if we're testing bytewise copies. + */ + + if (imx_nfc_module_force_bytewise_copy) + goto force_bytewise_copy; + + /* + * We'd like to use memcpy to get data into the NFC but, because that + * memory responds only to 16- and 32-byte writes, we can only do so + * safely if both the start and end of both the source and destination + * are perfectly aligned on 4-byte boundaries. + */ + + if (!(((unsigned long) from) & 0x3) && !(((unsigned long) to) & 0x3)) { + + /* + * If control arrives here, both the source and destination are + * aligned on 4-byte boundaries. Compute the number of whole, + * 4-byte chunks we can move. + */ + + chunk_count = n / 4; + + /* + * Move all the chunks we can, and then update the pointers and + * byte count to show what's left. + */ + + if (chunk_count) { + memcpy(to, from, chunk_count * 4); + from += chunk_count * 4; + to += chunk_count * 4; + n -= chunk_count * 4; + } + + } + + /* + * Move what's left. + */ + +force_bytewise_copy: + + nfc_util_bytewise_copy_to_nfc_mem(from, to, n); + +} + +/** + * nfc_util_copy_from_the_nfc() - Copies bytes out of the NFC. + * + * This function makes the data in the NFC look like a contiguous, model page. + * + * @this: Per-device data. + * @start: The index of the starting byte in the NFC. + * @buf: A pointer to the destination buffer. + * @len: The number of bytes to copy out. + */ +static void nfc_util_copy_from_the_nfc(struct imx_nfc_data *this, + unsigned int start, uint8_t *buf, unsigned int len) +{ + unsigned int i; + unsigned int count; + unsigned int offset; + unsigned int data_size; + unsigned int oob_size; + unsigned int total_size; + void *spare_base; + unsigned int first_spare; + void *from; + struct nfc_geometry *geometry = this->nfc_geometry; + + /* + * During initialization, the HIL will attempt to read ID bytes. For + * some NFC hardware versions, the ID bytes are deposited in the NFC + * memory, so this function will be called to deliver them. At that + * point, we won't know the NFC geometry. That's OK because we're only + * going to be reading a byte at a time. + * + * If we don't yet know the NFC geometry, just plug in some values that + * make things work for now. + */ + + if (unlikely(!geometry)) { + data_size = NFC_MAIN_BUF_SIZE; + oob_size = 0; + } else { + data_size = geometry->page_data_size; + oob_size = geometry->page_oob_size; + } + + total_size = data_size + oob_size; + + /* Validate. */ + + if ((start >= total_size) || ((start + len) > total_size)) { + dev_err(this->dev, "Bad copy from NFC memory: [%u, %u]\n", + start, len); + return; + } + + /* Check if we're copying anything at all. */ + + if (!len) + return; + + /* Check if anything comes from the main area. */ + + if (start < data_size) { + + /* Compute the bytes to copy from the main area. */ + + count = min(len, data_size - start); + + /* Copy. */ + + nfc_util_copy_from_nfc_mem(this->buffers + start, buf, count); + + buf += count; + start += count; + len -= count; + + } + + /* Check if we're done. */ + + if (!len) + return; + + /* Compute the base address of the spare buffers. */ + + spare_base = this->buffers + + (this->nfc->max_buffer_count * NFC_MAIN_BUF_SIZE); + + /* Discover in which spare buffer the copying begins. */ + + first_spare = (start - data_size) / geometry->spare_buf_size; + + /* Check if anything comes from the regular spare buffer area. */ + + if (first_spare < geometry->buffer_count) { + + /* Start copying from spare buffers. */ + + for (i = first_spare; i < geometry->buffer_count; i++) { + + /* Compute the offset into this spare area. */ + + offset = start - + (data_size + (geometry->spare_buf_size * i)); + + /* Compute the address of that offset. */ + + from = spare_base + offset + + (this->nfc->spare_buf_stride * i); + + /* Compute the bytes to copy from this spare area. */ + + count = min(len, geometry->spare_buf_size - offset); + + /* Copy. */ + + nfc_util_copy_from_nfc_mem(from, buf, count); + + buf += count; + start += count; + len -= count; + + } + + } + + /* Check if we're done. */ + + if (!len) + return; + + /* Compute the offset into the extra spare area. */ + + offset = start - + (data_size + (geometry->spare_buf_size*geometry->buffer_count)); + + /* Compute the address of that offset. */ + + from = spare_base + offset + + (this->nfc->spare_buf_stride * geometry->buffer_count); + + /* Compute the bytes to copy from the extra spare area. */ + + count = min(len, geometry->spare_buf_spill - offset); + + /* Copy. */ + + nfc_util_copy_from_nfc_mem(from, buf, count); + +} + +/** + * nfc_util_copy_to_the_nfc() - Copies bytes into the NFC memory. + * + * This function makes the data in the NFC look like a contiguous, model page. + * + * @this: Per-device data. + * @buf: A pointer to the source buffer. + * @start: The index of the starting byte in the NFC memory. + * @len: The number of bytes to copy in. + */ +static void nfc_util_copy_to_the_nfc(struct imx_nfc_data *this, + const uint8_t *buf, unsigned int start, unsigned int len) +{ + unsigned int i; + unsigned int count; + unsigned int offset; + unsigned int data_size; + unsigned int oob_size; + unsigned int total_size; + void *spare_base; + unsigned int first_spare; + void *to; + struct nfc_geometry *geometry = this->nfc_geometry; + + /* Establish some important facts. */ + + data_size = geometry->page_data_size; + oob_size = geometry->page_oob_size; + total_size = data_size + oob_size; + + /* Validate. */ + + if ((start >= total_size) || ((start + len) > total_size)) { + dev_err(this->dev, "Bad copy to NFC memory: [%u, %u]\n", + start, len); + return; + } + + /* Check if we're copying anything at all. */ + + if (!len) + return; + + /* Check if anything goes to the main area. */ + + if (start < data_size) { + + /* Compute the bytes to copy to the main area. */ + + count = min(len, data_size - start); + + /* Copy. */ + + nfc_util_copy_to_nfc_mem(buf, this->buffers + start, count); + + buf += count; + start += count; + len -= count; + + } + + /* Check if we're done. */ + + if (!len) + return; + + /* Compute the base address of the spare buffers. */ + + spare_base = this->buffers + + (this->nfc->max_buffer_count * NFC_MAIN_BUF_SIZE); + + /* Discover in which spare buffer the copying begins. */ + + first_spare = (start - data_size) / geometry->spare_buf_size; + + /* Check if anything goes to the regular spare buffer area. */ + + if (first_spare < geometry->buffer_count) { + + /* Start copying to spare buffers. */ + + for (i = first_spare; i < geometry->buffer_count; i++) { + + /* Compute the offset into this spare area. */ + + offset = start - + (data_size + (geometry->spare_buf_size * i)); + + /* Compute the address of that offset. */ + + to = spare_base + offset + + (this->nfc->spare_buf_stride * i); + + /* Compute the bytes to copy to this spare area. */ + + count = min(len, geometry->spare_buf_size - offset); + + /* Copy. */ + + nfc_util_copy_to_nfc_mem(buf, to, count); + + buf += count; + start += count; + len -= count; + + } + + } + + /* Check if we're done. */ + + if (!len) + return; + + /* Compute the offset into the extra spare area. */ + + offset = start - + (data_size + (geometry->spare_buf_size*geometry->buffer_count)); + + /* Compute the address of that offset. */ + + to = spare_base + offset + + (this->nfc->spare_buf_stride * geometry->buffer_count); + + /* Compute the bytes to copy to the extra spare area. */ + + count = min(len, geometry->spare_buf_spill - offset); + + /* Copy. */ + + nfc_util_copy_to_nfc_mem(buf, to, count); + +} + +/** + * nfc_util_isr() - i.MX NFC ISR. + * + * @irq: The arriving interrupt number. + * @context: A cookie for this ISR. + */ +static irqreturn_t nfc_util_isr(int irq, void *cookie) +{ + struct imx_nfc_data *this = cookie; + this->nfc->mask_interrupt(this); + this->nfc->clear_interrupt(this); + complete(&this->done); + return IRQ_HANDLED; +} + +/** + * nfc_util_send_cmd() - Sends a command to the current chip, without waiting. + * + * @this: Per-device data. + * @command: The command code. + */ + +static void nfc_util_send_cmd(struct imx_nfc_data *this, unsigned int command) +{ + + add_event("Entering nfc_util_send_cmd", 1); + + this->nfc->command_cycle(this, command); + + add_event("Exiting nfc_util_send_cmd", -1); + +} + +/** + * nfc_util_send_cmd_and_addrs() - Sends a cmd and addrs to the current chip. + * + * This function conveniently combines sending a command, and then sending + * optional addresses, waiting for the NFC to finish will all steps. + * + * @this: Per-device data. + * @command: The command code. + * @column: The column address to send, or -1 if no column address applies. + * @page: The page address to send, or -1 if no page address applies. + */ + +static void nfc_util_send_cmd_and_addrs(struct imx_nfc_data *this, + unsigned command, int column, int page) +{ + uint32_t page_mask; + + add_event("Entering nfc_util_send_cmd_and_addrs", 1); + + /* Send the command.*/ + + add_event("Sending the command...", 0); + + nfc_util_send_cmd(this, command); + + nfc_util_wait_for_the_nfc(this, false); + + /* Send the addresses. */ + + add_event("Sending the addresses...", 0); + + if (column != -1) { + + this->nfc->write_cycle(this, (column >> 0) & 0xff); + + if (is_large_page_chip(this)) + this->nfc->write_cycle(this, (column >> 8) & 0xff); + + } + + if (page != -1) { + + page_mask = this->nand.pagemask; + + do { + this->nfc->write_cycle(this, page & 0xff); + page_mask >>= 8; + page >>= 8; + } while (page_mask != 0); + + } + + add_event("Exiting nfc_util_send_cmd_and_addrs", -1); + +} + +/** + * nfc_2_x_exit() - Version-specific shut down. + * + * @this: Per-device data. + */ +static void nfc_2_x_exit(struct imx_nfc_data *this) +{ +} + +/** + * nfc_2_x_clear_interrupt() - Clears an interrupt. + * + * @this: Per-device data. + */ +static void nfc_2_x_clear_interrupt(struct imx_nfc_data *this) +{ + void *base = this->primary_regs; + raw_clr_mask_w(NFC_2_X_CONFIG2_INT_MSK, base + NFC_2_X_CONFIG2_REG_OFF); +} + +/** + * nfc_2_x_is_interrupting() - Returns the interrupt bit status. + * + * @this: Per-device data. + */ +static int nfc_2_x_is_interrupting(struct imx_nfc_data *this) +{ + void *base = this->primary_regs; + return raw_read_mask_w(NFC_2_X_CONFIG2_INT_MSK, + base + NFC_2_X_CONFIG2_REG_OFF); +} + +/** + * nfc_2_x_command_cycle() - Sends a command. + * + * @this: Per-device data. + * @command: The command code. + */ +static void nfc_2_x_command_cycle(struct imx_nfc_data *this, unsigned command) +{ + void *base = this->primary_regs; + + /* Write the command we want to send. */ + + __raw_writew(command, base + NFC_2_X_FLASH_CMD_REG_OFF); + + /* Launch a command cycle. */ + + __raw_writew(NFC_2_X_CONFIG2_FCMD_MSK, base + NFC_2_X_CONFIG2_REG_OFF); + +} + +/** + * nfc_2_x_write_cycle() - Writes a single byte. + * + * @this: Per-device data. + * @byte: The byte. + */ +static void nfc_2_x_write_cycle(struct imx_nfc_data *this, unsigned int byte) +{ + void *base = this->primary_regs; + + /* Give the NFC the byte we want to write. */ + + __raw_writew(byte, base + NFC_2_X_FLASH_ADDR_REG_OFF); + + /* Launch an address cycle. + * + * This is *sort* of a hack, but not really. The intent of the NFC + * design is for this operation to send an address byte. In fact, the + * NFC neither knows nor cares what we're sending. It justs runs a write + * cycle. + */ + + __raw_writew(NFC_2_X_CONFIG2_FADD_MSK, base + NFC_2_X_CONFIG2_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, false); + +} + +/** + * nfc_2_0_init() - Version-specific hardware initialization. + * + * @this: Per-device data. + */ +static int nfc_2_0_init(struct imx_nfc_data *this) +{ + void *base = this->primary_regs; + + /* Initialize the interrupt machinery. */ + + this->nfc->mask_interrupt(this); + this->nfc->clear_interrupt(this); + + /* Unlock the NFC memory. */ + + __raw_writew(0x2, base + NFC_2_X_CONFIG_REG_OFF); + + /* Set the unlocked block range to cover the entire medium. */ + + __raw_writew(0 , base + NFC_2_0_UNLOCK_START_REG_OFF); + __raw_writew(~0, base + NFC_2_0_UNLOCK_END_REG_OFF); + + /* Unlock all blocks. */ + + __raw_writew(0x4, base + NFC_2_X_WR_PROT_REG_OFF); + + /* Return success. */ + + return 0; + +} + +/** + * nfc_2_0_mask_interrupt() - Masks interrupts. + * + * @this: Per-device data. + */ +static void nfc_2_0_mask_interrupt(struct imx_nfc_data *this) +{ + void *base = this->primary_regs; + raw_set_mask_w(NFC_2_0_CONFIG1_INT_MSK_MSK, + base + NFC_2_0_CONFIG1_REG_OFF); +} + +/** + * nfc_2_0_unmask_interrupt() - Unmasks interrupts. + * + * @this: Per-device data. + */ +static void nfc_2_0_unmask_interrupt(struct imx_nfc_data *this) +{ + void *base = this->primary_regs; + raw_clr_mask_w(NFC_2_0_CONFIG1_INT_MSK_MSK, + base + NFC_2_0_CONFIG1_REG_OFF); +} + +/** + * nfc_2_0_set_ecc() - Turns ECC on or off. + * + * @this: Per-device data. + * @on: Indicates if ECC should be on or off. + */ +static void nfc_2_0_set_ecc(struct imx_nfc_data *this, int on) +{ + void *base = this->primary_regs; + + if (on) + raw_set_mask_w(NFC_2_0_CONFIG1_ECC_EN_MSK, + base + NFC_2_0_CONFIG1_REG_OFF); + else + raw_clr_mask_w(NFC_2_0_CONFIG1_ECC_EN_MSK, + base + NFC_2_0_CONFIG1_REG_OFF); + +} + +/** + * nfc_2_0_get_ecc_status() - Reports ECC errors. + * + * @this: Per-device data. + */ +static int nfc_2_0_get_ecc_status(struct imx_nfc_data *this) +{ + unsigned int i; + void *base = this->primary_regs; + uint16_t status_reg; + unsigned int buffer_status[4]; + int status; + + /* Get the entire status register. */ + + status_reg = __raw_readw(base + NFC_2_0_ECC_STATUS_REG_OFF); + + /* Pick out the status for each buffer. */ + + buffer_status[0] = (status_reg & NFC_2_0_ECC_STATUS_NOSER1_MSK) + >> NFC_2_0_ECC_STATUS_NOSER1_POS; + + buffer_status[1] = (status_reg & NFC_2_0_ECC_STATUS_NOSER2_MSK) + >> NFC_2_0_ECC_STATUS_NOSER2_POS; + + buffer_status[2] = (status_reg & NFC_2_0_ECC_STATUS_NOSER3_MSK) + >> NFC_2_0_ECC_STATUS_NOSER3_POS; + + buffer_status[3] = (status_reg & NFC_2_0_ECC_STATUS_NOSER4_MSK) + >> NFC_2_0_ECC_STATUS_NOSER4_POS; + + /* Loop through the buffers we're actually using. */ + + status = 0; + + for (i = 0; i < this->nfc_geometry->buffer_count; i++) { + + if (buffer_status[i] > this->nfc_geometry->ecc_strength) { + status = -1; + break; + } + + status += buffer_status[i]; + + } + + /* Return the final result. */ + + return status; + +} + +/** + * nfc_2_0_get_symmetric() - Indicates if the clock is symmetric. + * + * @this: Per-device data. + */ +static int nfc_2_0_get_symmetric(struct imx_nfc_data *this) +{ + void *base = this->primary_regs; + + return !!raw_read_mask_w(NFC_2_0_CONFIG1_ONE_CYLE_MSK, + base + NFC_2_0_CONFIG1_REG_OFF); + +} + +/** + * nfc_2_0_set_symmetric() - Turns symmetric clock mode on or off. + * + * @this: Per-device data. + */ +static void nfc_2_0_set_symmetric(struct imx_nfc_data *this, int on) +{ + void *base = this->primary_regs; + + if (on) + raw_set_mask_w(NFC_2_0_CONFIG1_ONE_CYLE_MSK, + base + NFC_2_0_CONFIG1_REG_OFF); + else + raw_clr_mask_w(NFC_2_0_CONFIG1_ONE_CYLE_MSK, + base + NFC_2_0_CONFIG1_REG_OFF); + +} + +/** + * nfc_2_0_set_geometry() - Configures for the medium geometry. + * + * @this: Per-device data. + */ +static int nfc_2_0_set_geometry(struct imx_nfc_data *this) +{ + struct physical_geometry *physical = &this->physical_geometry; + + /* Select an NFC geometry. */ + + switch (physical->page_data_size) { + + case 512: + this->nfc_geometry = &nfc_geometry_512_16_RS_ECC4; + break; + + case 2048: + this->nfc_geometry = &nfc_geometry_2K_64_RS_ECC4; + break; + + default: + dev_err(this->dev, "NFC can't handle page size: %u", + physical->page_data_size); + return !0; + break; + + } + + /* + * This NFC version receives page size information from a register + * that's external to the NFC. We must rely on platform-specific code + * to set this register for us. + */ + + return this->pdata->set_page_size(physical->page_data_size); + +} + +/** + * nfc_2_0_select_chip() - Selects the current chip. + * + * @this: Per-device data. + * @chip: The chip number to select, or -1 to select no chip. + */ +static void nfc_2_0_select_chip(struct imx_nfc_data *this, int chip) +{ +} + +/** + * nfc_2_0_read_cycle() - Applies a single read cycle to the current chip. + * + * @this: Per-device data. + */ +static unsigned int nfc_2_0_read_cycle(struct imx_nfc_data *this) +{ + uint8_t byte; + unsigned int result; + void *base = this->primary_regs; + + /* Read into main buffer 0. */ + + __raw_writew(0x0, base + NFC_2_0_BUF_ADDR_REG_OFF); + + /* Launch a "Data Out" operation. */ + + __raw_writew(0x4 << NFC_2_X_CONFIG2_FDO_POS, + base + NFC_2_X_CONFIG2_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, false); + + /* Get the result from the NFC memory. */ + + nfc_util_copy_from_the_nfc(this, 0, &byte, 1); + result = byte; + + /* Return the results. */ + + return result; + +} + +/** + * nfc_2_0_read_page() - Reads a page from the current chip into the NFC. + * + * @this: Per-device data. + */ +static void nfc_2_0_read_page(struct imx_nfc_data *this) +{ + unsigned int i; + void *base = this->primary_regs; + + /* Loop over the number of buffers in use. */ + + for (i = 0; i < this->nfc_geometry->buffer_count; i++) { + + /* Make the NFC read into the current buffer. */ + + __raw_writew(i << NFC_2_0_BUF_ADDR_RBA_POS, + base + NFC_2_0_BUF_ADDR_REG_OFF); + + /* Launch a page data out operation. */ + + __raw_writew(0x1 << NFC_2_X_CONFIG2_FDO_POS, + base + NFC_2_X_CONFIG2_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, true); + + } + +} + +/** + * nfc_2_0_send_page() - Sends a page from the NFC to the current chip. + * + * @this: Per-device data. + */ +static void nfc_2_0_send_page(struct imx_nfc_data *this) +{ + unsigned int i; + void *base = this->primary_regs; + + /* Loop over the number of buffers in use. */ + + for (i = 0; i < this->nfc_geometry->buffer_count; i++) { + + /* Make the NFC send from the current buffer. */ + + __raw_writew(i << NFC_2_0_BUF_ADDR_RBA_POS, + base + NFC_2_0_BUF_ADDR_REG_OFF); + + /* Launch a page data in operation. */ + + __raw_writew(0x1 << NFC_2_X_CONFIG2_FDI_POS, + base + NFC_2_X_CONFIG2_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, true); + + } + +} + +/** + * nfc_3_2_init() - Hardware initialization. + * + * @this: Per-device data. + */ +static int nfc_3_2_init(struct imx_nfc_data *this) +{ + int error; + unsigned int no_sdma; + unsigned int fmp; + unsigned int rbb_mode; + unsigned int num_of_devices; + unsigned int dma_mode; + unsigned int sbb; + unsigned int nf_big; + unsigned int sb2r; + unsigned int fw; + unsigned int too; + unsigned int add_op; + uint32_t config3; + void *primary_base = this->primary_regs; + void *secondary_base = this->secondary_regs; + + /* Initialize the interrupt machinery. */ + + this->nfc->mask_interrupt(this); + this->nfc->clear_interrupt(this); + + /* Set up the clock. */ + + error = this->nfc->set_closest_cycle(this, + this->pdata->target_cycle_in_ns); + + if (error) + return !0; + + /* We never read the spare area alone. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_SP_EN_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Tell the NFC the "Read Status" command code. */ + + raw_clr_mask_l(NFC_3_2_CONFIG2_ST_CMD_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + + raw_set_mask_l(NAND_CMD_STATUS << NFC_3_2_CONFIG2_ST_CMD_POS, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + + /* + * According to erratum ENGcm09051, the CONFIG3 register doesn't reset + * correctly, so we need to re-build the entire register just in case. + */ + + /* + * Set the NO_SDMA bit to tell the NFC that we are NOT using SDMA. If + * you clear this bit (to indicates you *are* using SDMA), but you + * don't actually set up SDMA, the NFC has been observed to crash the + * hardware when it asserts its DMA request signals. In the future, we + * *may* use SDMA, but it's not worth the effort at this writing. + */ + + no_sdma = 0x1; + + /* + * Set the default FIFO Mode Protection (128 bytes). FMP doesn't work if + * the NO_SDMA bit is set. + */ + + fmp = 0x2; + + /* + * The rbb_mode bit determines how the NFC figures out whether chips are + * ready during automatic operations only (this has no effect on atomic + * operations). The two choices are either to monitor the ready/busy + * signals, or to read the status register. We monitor the ready/busy + * signals. + */ + + rbb_mode = 0x1; + + /* + * We don't yet know how many devices are connected. We'll find out in + * out in nfc_3_2_set_geometry(). + */ + + num_of_devices = 0; + + /* Set the default DMA mode. */ + + dma_mode = 0x0; + + /* Set the default status busy bit. */ + + sbb = 0x6; + + /* Little-endian (the default). */ + + nf_big = 0x0; + + /* Set the default (standard) status bit to record. */ + + sb2r = 0x0; + + /* We support only 8-bit Flash bus width. */ + + fw = 0x1; + + /* We don't support "two-on-one." */ + + too = 0x0; + + /* Set the addressing option. */ + + add_op = 0x3; + + /* Set the CONFIG3 register. */ + + config3 = 0; + + config3 |= no_sdma << NFC_3_2_CONFIG3_NO_SDMA_POS; + config3 |= fmp << NFC_3_2_CONFIG3_FMP_POS; + config3 |= rbb_mode << NFC_3_2_CONFIG3_RBB_MODE_POS; + config3 |= num_of_devices << NFC_3_2_CONFIG3_NUM_OF_DEVICES_POS; + config3 |= dma_mode << NFC_3_2_CONFIG3_DMA_MODE_POS; + config3 |= sbb << NFC_3_2_CONFIG3_SBB_POS; + config3 |= nf_big << NFC_3_2_CONFIG3_NF_BIG_POS; + config3 |= sb2r << NFC_3_2_CONFIG3_SB2R_POS; + config3 |= fw << NFC_3_2_CONFIG3_FW_POS; + config3 |= too << NFC_3_2_CONFIG3_TOO_POS; + config3 |= add_op << NFC_3_2_CONFIG3_ADD_OP_POS; + + __raw_writel(config3, secondary_base + NFC_3_2_CONFIG3_REG_OFF); + + /* Return success. */ + + return 0; + +} + +/** + * nfc_3_2_set_geometry() - Configures for the medium geometry. + * + * @this: Per-device data. + */ +static int nfc_3_2_set_geometry(struct imx_nfc_data *this) +{ + unsigned int ps; + unsigned int cmd_phases; + unsigned int pages_per_chip; + unsigned int addr_phases0; + unsigned int addr_phases1; + unsigned int pages_per_block; + unsigned int ecc_mode; + unsigned int ppb; + unsigned int spas; + unsigned int mask; + uint32_t config2; + unsigned int num_of_devices; + uint32_t config3; + unsigned int x; + unsigned int chip; + struct physical_geometry *physical = &this->physical_geometry; + void *secondary_base = this->secondary_regs; + + /* + * Select an NFC geometry based on the physical geometry and the + * capabilities of this NFC. + */ + + switch (physical->page_data_size) { + + case 512: + this->nfc_geometry = &nfc_geometry_512_16_BCH_ECC4; + ps = 0; + break; + + case 2048: + this->nfc_geometry = &nfc_geometry_2K_64_BCH_ECC4; + ps = 1; + break; + + case 4096: + + switch (this->physical_geometry.page_oob_size) { + + case 128: + this->nfc_geometry = &nfc_geometry_4K_128_BCH_ECC4; + break; + + case 218: + this->nfc_geometry = &nfc_geometry_4K_218_BCH_ECC8; + break; + + default: + dev_err(this->dev, + "NFC can't handle page geometry: %u+%u", + physical->page_data_size, + physical->page_oob_size); + return !0; + break; + + } + + ps = 2; + + break; + + default: + dev_err(this->dev, "NFC can't handle page size: %u", + physical->page_data_size); + return !0; + break; + + } + + /* Compute the ECC mode. */ + + switch (this->nfc_geometry->ecc_strength) { + + case 4: + ecc_mode = 0; + break; + + case 8: + ecc_mode = 1; + break; + + default: + dev_err(this->dev, "NFC can't handle ECC strength: %u", + this->nfc_geometry->ecc_strength); + return !0; + break; + + } + + /* Compute the pages per block. */ + + pages_per_block = physical->block_size / physical->page_data_size; + + switch (pages_per_block) { + case 32: + ppb = 0; + break; + case 64: + ppb = 1; + break; + case 128: + ppb = 2; + break; + case 256: + ppb = 3; + break; + default: + dev_err(this->dev, "NFC can't handle pages per block: %d", + pages_per_block); + return !0; + break; + } + + /* + * The hardware needs to know the physical size of the spare area, in + * units of half-words (16 bits). This may be different from the amount + * of the spare area we actually expose to MTD. For example, for for + * 2K+112, we only expose 64 spare bytes, but the hardware needs to know + * the real facts. + */ + + spas = this->physical_geometry.page_oob_size >> 1; + + /* + * The number of command phases needed to read a page is directly + * dependent on whether this is a small page or large page device. Large + * page devices need more address phases, terminated by a second command + * phase. + */ + + cmd_phases = is_large_page_chip(this) ? 1 : 0; + + /* + * The num_adr_phases1 field contains the number of phases needed to + * transmit addresses for read and program operations. This is the sum + * of the number of phases for a page address and the number of phases + * for a column address. + * + * The number of phases for a page address is the number of bytes needed + * to contain a page address. + * + * The number of phases for a column address is the number of bytes + * needed to contain a column address. + * + * After computing the sum, we subtract three because a value of zero in + * this field indicates three address phases, and this is the minimum + * number of phases the hardware can comprehend. + * + * We compute the number of phases based on the *physical* geometry, not + * the NFC geometry. For example, even if we are treating a very large + * device as if it contains fewer pages than it actually does, the + * hardware still needs the additional address phases. + */ + + pages_per_chip = + physical->chip_size >> (fls(physical->page_data_size) - 1); + + addr_phases1 = (fls(pages_per_chip) >> 3) + 1; + + addr_phases1 += (fls(physical->page_data_size) >> 3) + 1; + + addr_phases1 -= 3; + + /* + * The num_adr_phases0 field contains the number of phases needed to + * transmit a page address for an erase operation. That is, this is + * the value of addr_phases1, less the number of phases for the column + * address. + * + * The hardware expresses this phase count as one or two cycles less + * than the count indicated by add_phases1 (see the reference manual). + */ + + addr_phases0 = is_large_page_chip(this) ? 1 : 0; + + /* Set the CONFIG2 register. */ + + mask = + NFC_3_2_CONFIG2_PS_MSK | + NFC_3_2_CONFIG2_CMD_PHASES_MSK | + NFC_3_2_CONFIG2_ADDR_PHASES0_MSK | + NFC_3_2_CONFIG2_ECC_MODE_MSK | + NFC_3_2_CONFIG2_PPB_MSK | + NFC_3_2_CONFIG2_ADDR_PHASES1_MSK | + NFC_3_2_CONFIG2_SPAS_MSK ; + + config2 = __raw_readl(secondary_base + NFC_3_2_CONFIG2_REG_OFF); + + config2 &= ~mask; + + config2 |= ps << NFC_3_2_CONFIG2_PS_POS; + config2 |= cmd_phases << NFC_3_2_CONFIG2_CMD_PHASES_POS; + config2 |= addr_phases0 << NFC_3_2_CONFIG2_ADDR_PHASES0_POS; + config2 |= ecc_mode << NFC_3_2_CONFIG2_ECC_MODE_POS; + config2 |= ppb << NFC_3_2_CONFIG2_PPB_POS; + config2 |= addr_phases1 << NFC_3_2_CONFIG2_ADDR_PHASES1_POS; + config2 |= spas << NFC_3_2_CONFIG2_SPAS_POS; + + config2 = __raw_writel(config2, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + + /* + * Compute the num_of_devices field. + * + * It's very important to set this field correctly. This controls the + * set of ready/busy lines to which the NFC listens with automatic + * transactions. If this number is too large, the NFC will listen to + * ready/busy signals that are electrically floating, or it will try to + * read the status registers of chips that don't exist. Conversely, if + * the number is too small, the NFC could believe an operation is + * finished when some chips are still busy. + */ + + num_of_devices = physical->chip_count - 1; + + /* Set the CONFIG3 register. */ + + mask = NFC_3_2_CONFIG3_NUM_OF_DEVICES_MSK; + + config3 = __raw_readl(secondary_base + NFC_3_2_CONFIG3_REG_OFF); + + config3 &= ~mask; + + config3 |= num_of_devices << NFC_3_2_CONFIG3_NUM_OF_DEVICES_POS; + + __raw_writel(config3, secondary_base + NFC_3_2_CONFIG3_REG_OFF); + + /* + * Check if the physical chip count is a power of 2. If not, then + * automatic operations aren't available. This is because we use an + * addressing option (see the ADD_OP field of CONFIG3) that requires + * a number of chips that is a power of 2. + */ + + if (ffs(physical->chip_count) != fls(physical->chip_count)) { + this->nfc->start_auto_read = 0; + this->nfc->start_auto_write = 0; + this->nfc->start_auto_erase = 0; + } + + /* Unlock the NFC RAM. */ + + x = __raw_readl(secondary_base + NFC_3_2_WRPROT_REG_OFF); + x &= ~NFC_3_2_WRPROT_BLS_MSK; + x |= 0x2 << NFC_3_2_WRPROT_BLS_POS; + __raw_writel(x, secondary_base + NFC_3_2_WRPROT_REG_OFF); + + /* Loop over chip selects, setting the unlocked ranges. */ + + for (chip = 0; chip < this->nfc->max_chip_count; chip++) { + + /* Set the unlocked range to cover the entire chip.*/ + + __raw_writel(0xffff0000, secondary_base + + NFC_3_2_UNLOCK_BLK_ADD0_REG_OFF + (chip * 4)); + + /* Unlock. */ + + x = __raw_readl(secondary_base + NFC_3_2_WRPROT_REG_OFF); + x &= ~(NFC_3_2_WRPROT_CS2L_MSK | NFC_3_2_WRPROT_WPC_MSK); + x |= chip << NFC_3_2_WRPROT_CS2L_POS; + x |= 0x4 << NFC_3_2_WRPROT_WPC_POS ; + __raw_writel(x, secondary_base + NFC_3_2_WRPROT_REG_OFF); + + } + + /* Return success. */ + + return 0; + +} + +/** + * nfc_3_2_exit() - Hardware cleanup. + * + * @this: Per-device data. + */ +static void nfc_3_2_exit(struct imx_nfc_data *this) +{ +} + +/** + * nfc_3_2_set_closest_cycle() - Version-specific hardware cleanup. + * + * @this: Per-device data. + */ +static int nfc_3_2_set_closest_cycle(struct imx_nfc_data *this, unsigned ns) +{ + struct clk *parent_clock; + unsigned long parent_clock_rate_in_hz; + unsigned long sym_low_clock_rate_in_hz; + unsigned long asym_low_clock_rate_in_hz; + unsigned int sym_high_cycle_in_ns; + unsigned int asym_high_cycle_in_ns; + + /* + * According to ENGcm09121: + * + * - If the NFC is set to SYMMETRIC mode, the NFC clock divider must + * divide the EMI Slow Clock by NO MORE THAN 4. + * + * - If the NFC is set for ASYMMETRIC mode, the NFC clock divider must + * divide the EMI Slow Clock by NO MORE THAN 3. + * + * We need to compute the corresponding cycle time constraints. Start + * by getting information about the parent clock. + */ + + parent_clock = clk_get_parent(this->clock); + parent_clock_rate_in_hz = clk_get_rate(parent_clock); + + /* Compute the limit frequencies. */ + + sym_low_clock_rate_in_hz = parent_clock_rate_in_hz / 4; + asym_low_clock_rate_in_hz = parent_clock_rate_in_hz / 3; + + /* Compute the corresponding limit cycle periods. */ + + sym_high_cycle_in_ns = 1000000000 / sym_low_clock_rate_in_hz; + asym_high_cycle_in_ns = (1000000000 / asym_low_clock_rate_in_hz) * 2; + + /* Attempt to implement the given cycle. */ + + return nfc_util_set_best_cycle(this, ns, + ns > asym_high_cycle_in_ns, ns > sym_high_cycle_in_ns); + +} + +/** + * nfc_3_2_mask_interrupt() - Masks interrupts. + * + * @this: Per-device data. + */ +static void nfc_3_2_mask_interrupt(struct imx_nfc_data *this) +{ + void *secondary_base = this->secondary_regs; + raw_set_mask_l(NFC_3_2_CONFIG2_INT_MSK_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); +} + +/** + * nfc_3_2_unmask_interrupt() - Unmasks interrupts. + * + * @this: Per-device data. + */ +static void nfc_3_2_unmask_interrupt(struct imx_nfc_data *this) +{ + void *secondary_base = this->secondary_regs; + raw_clr_mask_l(NFC_3_2_CONFIG2_INT_MSK_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); +} + +/** + * nfc_3_2_clear_interrupt() - Clears an interrupt. + * + * @this: Per-device data. + */ +static void nfc_3_2_clear_interrupt(struct imx_nfc_data *this) +{ + int done; + void *secondary_base = this->secondary_regs; + + /* Request IP bus interface access. */ + + raw_set_mask_l(NFC_3_2_IPC_CREQ_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + + /* Wait for access. */ + + do + done = !!raw_read_mask_l(NFC_3_2_IPC_CACK_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + while (!done); + + /* Clear the interrupt. */ + + raw_clr_mask_l(NFC_3_2_IPC_INT_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + + /* Release the IP bus interface. */ + + raw_clr_mask_l(NFC_3_2_IPC_CREQ_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + +} + +/** + * nfc_3_2_is_interrupting() - Returns the interrupt bit status. + * + * @this: Per-device data. + */ +static int nfc_3_2_is_interrupting(struct imx_nfc_data *this) +{ + void *secondary_base = this->secondary_regs; + return !!raw_read_mask_l(NFC_3_2_IPC_INT_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); +} + +/** + * nfc_3_2_is_ready() - Returns the ready/busy status. + * + * @this: Per-device data. + */ +static int nfc_3_2_is_ready(struct imx_nfc_data *this) +{ + void *secondary_base = this->secondary_regs; + return !!raw_read_mask_l(NFC_3_2_IPC_RB_B_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); +} + +/** + * nfc_3_2_set_force_ce() - Can force CE to be asserted always. + * + * @this: Per-device data. + * @on: Indicates if the hardware CE signal should be asserted always. + */ +static void nfc_3_2_set_force_ce(struct imx_nfc_data *this, int on) +{ + void *primary_base = this->primary_regs; + + if (on) + raw_set_mask_l(NFC_3_2_CONFIG1_NF_CE_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + else + raw_clr_mask_l(NFC_3_2_CONFIG1_NF_CE_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + +} + +/** + * nfc_3_2_set_ecc() - Turns ECC on or off. + * + * @this: Per-device data. + * @on: Indicates if ECC should be on or off. + */ +static void nfc_3_2_set_ecc(struct imx_nfc_data *this, int on) +{ + void *secondary_base = this->secondary_regs; + + if (on) + raw_set_mask_l(NFC_3_2_CONFIG2_ECC_EN_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + else + raw_clr_mask_l(NFC_3_2_CONFIG2_ECC_EN_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + +} + +/** + * nfc_3_2_get_ecc_status() - Reports ECC errors. + * + * @this: Per-device data. + */ +static int nfc_3_2_get_ecc_status(struct imx_nfc_data *this) +{ + unsigned int i; + void *base = this->primary_regs; + uint16_t status_reg; + unsigned int buffer_status[8]; + int status; + + /* Get the entire status register. */ + + status_reg = __raw_readw(base + NFC_3_2_ECC_STATUS_REG_OFF); + + /* Pick out the status for each buffer. */ + + buffer_status[0] = (status_reg & NFC_3_2_ECC_STATUS_NOBER1_MSK) + >> NFC_3_2_ECC_STATUS_NOBER1_POS; + + buffer_status[1] = (status_reg & NFC_3_2_ECC_STATUS_NOBER2_MSK) + >> NFC_3_2_ECC_STATUS_NOBER2_POS; + + buffer_status[2] = (status_reg & NFC_3_2_ECC_STATUS_NOBER3_MSK) + >> NFC_3_2_ECC_STATUS_NOBER3_POS; + + buffer_status[3] = (status_reg & NFC_3_2_ECC_STATUS_NOBER4_MSK) + >> NFC_3_2_ECC_STATUS_NOBER4_POS; + + buffer_status[4] = (status_reg & NFC_3_2_ECC_STATUS_NOBER5_MSK) + >> NFC_3_2_ECC_STATUS_NOBER5_POS; + + buffer_status[5] = (status_reg & NFC_3_2_ECC_STATUS_NOBER6_MSK) + >> NFC_3_2_ECC_STATUS_NOBER6_POS; + + buffer_status[6] = (status_reg & NFC_3_2_ECC_STATUS_NOBER7_MSK) + >> NFC_3_2_ECC_STATUS_NOBER7_POS; + + buffer_status[7] = (status_reg & NFC_3_2_ECC_STATUS_NOBER8_MSK) + >> NFC_3_2_ECC_STATUS_NOBER8_POS; + + /* Loop through the buffers we're actually using. */ + + status = 0; + + for (i = 0; i < this->nfc_geometry->buffer_count; i++) { + + if (buffer_status[i] > this->nfc_geometry->ecc_strength) { + status = -1; + break; + } + + status += buffer_status[i]; + + } + + /* Return the final result. */ + + return status; + +} + +/** + * nfc_3_2_get_symmetric() - Indicates if the clock is symmetric. + * + * @this: Per-device data. + */ +static int nfc_3_2_get_symmetric(struct imx_nfc_data *this) +{ + void *secondary_base = this->secondary_regs; + + return !!raw_read_mask_w(NFC_3_2_CONFIG2_SYM_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + +} + +/** + * nfc_3_2_set_symmetric() - Turns symmetric clock mode on or off. + * + * @this: Per-device data. + */ +static void nfc_3_2_set_symmetric(struct imx_nfc_data *this, int on) +{ + void *secondary_base = this->secondary_regs; + + if (on) + raw_set_mask_l(NFC_3_2_CONFIG2_SYM_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + else + raw_clr_mask_l(NFC_3_2_CONFIG2_SYM_MSK, + secondary_base + NFC_3_2_CONFIG2_REG_OFF); + +} + +/** + * nfc_3_2_select_chip() - Selects the current chip. + * + * @this: Per-device data. + * @chip: The chip number to select, or -1 to select no chip. + */ +static void nfc_3_2_select_chip(struct imx_nfc_data *this, int chip) +{ + unsigned long x; + void *primary_base = this->primary_regs; + + if (chip < 0) + return; + + x = __raw_readl(primary_base + NFC_3_2_CONFIG1_REG_OFF); + + x &= ~NFC_3_2_CONFIG1_CS_MSK; + + x |= (chip << NFC_3_2_CONFIG1_CS_POS) & NFC_3_2_CONFIG1_CS_MSK; + + __raw_writel(x, primary_base + NFC_3_2_CONFIG1_REG_OFF); + +} + +/** + * nfc_3_2_command_cycle() - Sends a command. + * + * @this: Per-device data. + * @command: The command code. + */ +static void nfc_3_2_command_cycle(struct imx_nfc_data *this, unsigned command) +{ + void *primary_base = this->primary_regs; + + /* Write the command we want to send. */ + + __raw_writel(command, primary_base + NFC_3_2_CMD_REG_OFF); + + /* Launch a command cycle. */ + + __raw_writel(NFC_3_2_LAUNCH_FCMD_MSK, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + +} + +/** + * nfc_3_2_write_cycle() - writes a single byte. + * + * @this: Per-device data. + * @byte: The byte. + */ +static void nfc_3_2_write_cycle(struct imx_nfc_data *this, unsigned int byte) +{ + void *primary_base = this->primary_regs; + + /* Give the NFC the byte we want to write. */ + + __raw_writel(byte, primary_base + NFC_3_2_ADD0_REG_OFF); + + /* Launch an address cycle. + * + * This is *sort* of a hack, but not really. The intent of the NFC + * design is for this operation to send an address byte. In fact, the + * NFC neither knows nor cares what we're sending. It justs runs a write + * cycle. + */ + + __raw_writel(NFC_3_2_LAUNCH_FADD_MSK, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, false); + +} + +/** + * nfc_3_2_read_cycle() - Applies a single read cycle to the current chip. + * + * @this: Per-device data. + */ +static unsigned int nfc_3_2_read_cycle(struct imx_nfc_data *this) +{ + unsigned int result; + void *primary_base = this->primary_regs; + + /* Launch a "Data Out" operation. */ + + __raw_writel(0x4 << NFC_3_2_LAUNCH_FDO_POS, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, false); + + /* Get the result. */ + + result = __raw_readl(primary_base + NFC_3_2_CONFIG1_REG_OFF) + >> NFC_3_2_CONFIG1_STATUS_POS; + result &= 0xff; + + /* Return the result. */ + + return result; + +} + +/** + * nfc_3_2_read_page() - Reads a page into the NFC memory. + * + * @this: Per-device data. + */ +static void nfc_3_2_read_page(struct imx_nfc_data *this) +{ + void *primary_base = this->primary_regs; + + /* Start reading into buffer 0. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_RBA_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Launch a page data out operation. */ + + __raw_writel(0x1 << NFC_3_2_LAUNCH_FDO_POS, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, true); + +} + +/** + * nfc_3_2_send_page() - Sends a page from the NFC to the current chip. + * + * @this: Per-device data. + */ +static void nfc_3_2_send_page(struct imx_nfc_data *this) +{ + void *primary_base = this->primary_regs; + + /* Start sending from buffer 0. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_RBA_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Launch a page data in operation. */ + + __raw_writel(NFC_3_2_LAUNCH_FDI_MSK, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, true); + +} + +/** + * nfc_3_2_add_state_events() - Adds events to display important state. + * + * @this: Per-device data. + */ +static void nfc_3_2_add_state_events(struct imx_nfc_data *this) +{ +#ifdef EVENT_REPORTING + void *secondary_base = this->secondary_regs; + + add_state_event_l + ( + secondary_base + NFC_3_2_IPC_REG_OFF, + NFC_3_2_IPC_INT_MSK, + " Interrupt : 0", + " Interrupt : X" + ); + + add_state_event_l + ( + secondary_base + NFC_3_2_IPC_REG_OFF, + NFC_3_2_IPC_AUTO_PROG_DONE_MSK, + " auto_prog_done: 0", + " auto_prog_done: X" + ); + + add_state_event_l + ( + secondary_base + NFC_3_2_IPC_REG_OFF, + NFC_3_2_IPC_RB_B_MSK, + " Medium : Busy", + " Medium : Ready" + ); +#endif +} + +/** + * nfc_3_2_get_auto_loop_params() - Gets automatic operation loop parameters. + * + * This function and the corresponding "setter" enable the automatic operations + * to keep some state as they iterate over chips. + * + * The most "obvious" way to save state would be to allocate a private data + * structure and hang it off the owning struct nfc_hal. On the other hand, + * writing the code to allocate the memory and then release it when the NFC + * shuts down is annoying - and we have some perfectly good memory in the NFC + * hardware that we can use. Since we only use two commands at a time, we can + * stash our loop limits and loop index in the top 16 bits of the NAND_CMD + * register. To paraphrase the reference manual: + * + * + * NAND_CMD + * + * |<-- 4 bits -->|<-- 4 bits -->|<-- 8 bits -->| + * +----------------+---------------+--------------------------------+ + * | First | Last | Loop Index | + * +----------------+---------------+--------------------------------+ + * | NAND COMMAND1 | NAND COMMAND0 | + * +--------------------------------+--------------------------------+ + * |<-- 16 bits -->|<-- 16 bits -->| + * + * + * @this: Per-device data. + * @first: A pointer to a variable that will receive the first chip number. + * @last: A pointer to a variable that will receive the last chip number. + * @index: A pointer to a variable that will receive the current chip number. + */ +static void nfc_3_2_get_auto_loop_params(struct imx_nfc_data *this, + unsigned *first, unsigned *last, unsigned *index) +{ + uint32_t x; + void *primary_base = this->primary_regs; + + x = __raw_readl(primary_base + NFC_3_2_CMD_REG_OFF); + + *first = (x >> 28) & 0x0f; + *last = (x >> 24) & 0x0f; + *index = (x >> 16) & 0xff; + +} + +/** + * nfc_3_2_set_auto_loop_params() - Sets automatic operation loop parameters. + * + * See nfc_3_2_get_auto_loop_params() for detailed information about these + * functions. + * + * @this: Per-device data. + * @first: The first chip number. + * @last: The last chip number. + * @index: The current chip number. + */ +static void nfc_3_2_set_auto_loop_params(struct imx_nfc_data *this, + unsigned first, unsigned last, unsigned index) +{ + uint32_t x; + void *primary_base = this->primary_regs; + + x = __raw_readl(primary_base + NFC_3_2_CMD_REG_OFF); + + x &= 0x0000ffff; + x |= (first & 0x0f) << 28; + x |= (last & 0x0f) << 24; + x |= (index & 0xff) << 16; + + __raw_writel(x, primary_base + NFC_3_2_CMD_REG_OFF); + +} + +/** + * nfc_3_2_get_auto_addresses() - Gets automatic operation addresses. + * + * @this: Per-device data. + * @group: The address group number. + * @chip: A pointer to a variable that will receive the chip number. + * @column: A pointer to a variable that will receive the column address. + * A NULL pointer indicates there is no column address. + * @page: A pointer to a variable that will receive the page address. + */ +static void nfc_3_2_get_auto_addresses(struct imx_nfc_data *this, + unsigned group, unsigned *chip, unsigned *column, unsigned *page) +{ + uint32_t x; + unsigned int chip_count; + unsigned int cs_width; + unsigned int cs_mask; + unsigned int page_lsbs; + unsigned int page_msbs; + uint32_t *low; + uint16_t *high; + void *primary_base = this->primary_regs; + void *secondary_base = this->secondary_regs; + + /* + * The width of the chip select field depends on the number of connected + * chips. + * + * Notice that these computations work only if the number of chips is a + * power of 2. In fact, that is a fundamental limitation for using + * automatic operations. + */ + + x = __raw_readl(secondary_base + NFC_3_2_CONFIG3_REG_OFF); + + chip_count = + (x & NFC_3_2_CONFIG3_NUM_OF_DEVICES_MSK) >> + NFC_3_2_CONFIG3_NUM_OF_DEVICES_POS; + chip_count++; + + cs_width = ffs(chip_count) - 1; + cs_mask = chip_count - 1; + + /* Construct pointers to the pieces of the given address group. */ + + low = primary_base + NFC_3_2_ADD0_REG_OFF; + low += group; + + high = primary_base + NFC_3_2_ADD8_REG_OFF; + high += group; + + /* Check if there's a column address. */ + + if (column) { + + /* + * The low 32 bits of the address group look like this: + * + * 16 - n n + * | <- bits ->|<->|<- 16 bits ->| + * +-------------+---+----------------+ + * | Page LSBs |CS | Column | + * +-------------+---+----------------+ + */ + + x = __raw_readl(low); + + *column = x & 0xffff; + *chip = (x >> 16) & cs_mask; + page_lsbs = x >> (16 + cs_width); + + /* The high 16 bits contain the MSB's of the page address. */ + + page_msbs = __raw_readw(high); + + *page = (page_msbs << (16 - cs_width)) | page_lsbs; + + } else { + + /* + * The low 32 bits of the address group look like this: + * + * n + * | <- (32 - n) bits ->|<->| + * +-----------------------------+---+ + * | Page LSBs |CS | + * +-----------------------------+---+ + */ + + x = __raw_readl(low); + + *chip = x & cs_mask; + page_lsbs = x >> cs_width; + + /* The high 16 bits contain the MSB's of the page address. */ + + page_msbs = __raw_readw(high); + + *page = (page_msbs << (32 - cs_width)) | page_lsbs; + + } + +} + +/** + * nfc_3_2_set_auto_addresses() - Sets automatic operation addresses. + * + * @this: Per-device data. + * @group: The address group number. + * @chip: The chip number. + * @column: The column address. The sentinel value ~0 indicates that there is + * no column address. + * @page: The page address. + */ +static void nfc_3_2_set_auto_addresses(struct imx_nfc_data *this, + unsigned group, unsigned chip, unsigned column, unsigned page) +{ + uint32_t x; + unsigned chip_count; + unsigned int cs_width; + unsigned int cs_mask; + uint32_t *low; + uint16_t *high; + void *primary_base = this->primary_regs; + void *secondary_base = this->secondary_regs; + + /* + * The width of the chip select field depends on the number of connected + * chips. + * + * Notice that these computations work only if the number of chips is a + * power of 2. In fact, that is a fundamental limitation for using + * automatic operations. + */ + + x = __raw_readl(secondary_base + NFC_3_2_CONFIG3_REG_OFF); + + chip_count = + (x & NFC_3_2_CONFIG3_NUM_OF_DEVICES_MSK) >> + NFC_3_2_CONFIG3_NUM_OF_DEVICES_POS; + chip_count++; + + cs_width = ffs(chip_count) - 1; + cs_mask = chip_count - 1; + + /* Construct pointers to the pieces of the given address group. */ + + low = primary_base + NFC_3_2_ADD0_REG_OFF; + low += group; + + high = primary_base + NFC_3_2_ADD8_REG_OFF; + high += group; + + /* Check if we have a column address. */ + + if (column != ~0) { + + /* + * The low 32 bits of the address group look like this: + * + * 16 - n n + * | <- bits ->|<->|<- 16 bits ->| + * +-------------+---+----------------+ + * | Page LSBs |CS | Column | + * +-------------+---+----------------+ + */ + + x = 0; + x |= column & 0xffff; + x |= (chip & cs_mask) << 16; + x |= page << (16 + cs_width); + + __raw_writel(x, low); + + /* The high 16 bits contain the MSB's of the page address. */ + + x = (page >> (16 - cs_width)) & 0xffff; + + __raw_writew(x, high); + + } else { + + /* + * The low 32 bits of the address group look like this: + * + * n + * | <- (32 - n) bits ->|<->| + * +-----------------------------+---+ + * | Page LSBs |CS | + * +-----------------------------+---+ + */ + + x = 0; + x |= chip & cs_mask; + x |= page << cs_width; + + __raw_writel(x, low); + + /* The high 16 bits contain the MSB's of the page address. */ + + x = (page >> (32 - cs_width)) & 0xffff; + + __raw_writew(x, high); + + } + +} + +/** + * nfc_3_2_start_auto_read() - Starts an automatic read. + * + * This function returns 0 if everything went well. + * + * @this: Per-device data. + * @start: The first physical chip number on which to operate. + * @count: The number of physical chips on which to operate. + * @column: The column address. + * @page: The page address. + */ +static int nfc_3_2_start_auto_read(struct imx_nfc_data *this, + unsigned start, unsigned count, unsigned column, unsigned page) +{ + uint32_t x; + int return_value = 0; + void *primary_base = this->primary_regs; + + add_event("Entering nfc_3_2_start_auto_read", 1); + + /* Check for nonsense. */ + + if ((start > 7) || (!count) || (count > 8)) { + return_value = !0; + goto exit; + } + + /* Set state. */ + + nfc_3_2_set_auto_loop_params(this, start, start + count - 1, start); + nfc_3_2_set_auto_addresses(this, 0, start, column, page); + + /* Set up for ONE iteration at a time. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_ITER_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Reset to buffer 0. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_RBA_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* + * Set up the commands. Note that the number of command phases was + * configured in the set_geometry() function so, even though we're + * giving both commands here, they won't necessarily both be used. + */ + + x = __raw_readl(primary_base + NFC_3_2_CMD_REG_OFF); + + x &= 0xffff0000; + x |= NAND_CMD_READ0 << 0; + x |= NAND_CMD_READSTART << 8; + + __raw_writel(x, primary_base + NFC_3_2_CMD_REG_OFF); + + /* Launch the operation. */ + + add_event("Launching", 0); + + __raw_writel(NFC_3_2_LAUNCH_AUTO_READ_MSK, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + +exit: /* Return. */ + + add_event("Exiting nfc_3_2_start_auto_read", -1); + + return return_value; + +} + +/** + * nfc_3_2_wait_for_auto_read() - Waits until auto read is ready for the CPU. + * + * This function returns 0 if everything went well. + * + * @this: Per-device data. + */ +static int nfc_3_2_wait_for_auto_read(struct imx_nfc_data *this) +{ + unsigned int first; + unsigned int last; + unsigned int index; + int return_value = 0; + + add_event("Entering nfc_3_2_wait_for_auto_read", 1); + + /* Get state. */ + + nfc_3_2_get_auto_loop_params(this, &first, &last, &index); + + /* This function should be called for every chip. */ + + if ((index < first) || (index > last)) { + return_value = !0; + goto exit; + } + + /* Wait for the NFC to completely finish and interrupt. */ + + nfc_util_wait_for_the_nfc(this, true); + +exit: /* Return. */ + + add_event("Exiting nfc_3_2_wait_for_auto_read", -1); + + return return_value; + +} + +/** + * nfc_3_2_resume_auto_read() - Resumes auto read after CPU intervention. + * + * This function returns 0 if everything went well. + * + * @this: Per-device data. + */ +static int nfc_3_2_resume_auto_read(struct imx_nfc_data *this) +{ + unsigned int first; + unsigned int last; + unsigned int index; + unsigned int chip; + unsigned int column; + unsigned int page; + int return_value = 0; + void *primary_base = this->primary_regs; + + add_event("Entering nfc_3_2_resume_auto_read", 1); + + /* Get state. */ + + nfc_3_2_get_auto_loop_params(this, &first, &last, &index); + nfc_3_2_get_auto_addresses(this, 0, &chip, &column, &page); + + /* This function should be called for every chip, except the last. */ + + if ((index < first) || (index >= last)) { + return_value = !0; + goto exit; + } + + /* Move to the next chip. */ + + index++; + + /* Update state. */ + + nfc_3_2_set_auto_loop_params(this, first, last, index); + nfc_3_2_set_auto_addresses(this, 0, index, column, page); + + /* Reset to buffer 0. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_RBA_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Launch the operation. */ + + add_event("Launching", 0); + + __raw_writel(NFC_3_2_LAUNCH_AUTO_READ_MSK, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + +exit: /* Return. */ + + add_event("Exiting nfc_3_2_resume_auto_read", -1); + + return return_value; + +} + +/** + * nfc_3_2_start_auto_write() - Starts an automatic write. + * + * This function returns 0 if everything went well. + * + * @this: Per-device data. + * @start: The first physical chip number on which to operate. + * @count: The number of physical chips on which to operate. + * @column: The column address. + * @page: The page address. + */ +static int nfc_3_2_start_auto_write(struct imx_nfc_data *this, + unsigned start, unsigned count, unsigned column, unsigned page) +{ + uint32_t x; + int return_value = 0; + void *primary_base = this->primary_regs; + void *secondary_base = this->secondary_regs; + + add_event("Entering nfc_3_2_start_auto_write", 1); + + /* Check for nonsense. */ + + if ((start > 7) || (!count) || (count > 8)) { + return_value = !0; + goto exit; + } + + /* Set state. */ + + nfc_3_2_set_auto_loop_params(this, start, start + count - 1, start); + nfc_3_2_set_auto_addresses(this, 0, start, column, page); + + /* Set up for ONE iteration at a time. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_ITER_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Set up the commands. */ + + x = __raw_readl(primary_base + NFC_3_2_CMD_REG_OFF); + + x &= 0xffff0000; + x |= NAND_CMD_SEQIN << 0; + x |= NAND_CMD_PAGEPROG << 8; + + __raw_writel(x, primary_base + NFC_3_2_CMD_REG_OFF); + + /* Clear the auto_prog_done bit. */ + + raw_clr_mask_l(NFC_3_2_IPC_AUTO_PROG_DONE_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + +exit: /* Return. */ + + add_event("Exiting nfc_3_2_start_auto_write", -1); + + return return_value; + +} + +/** + * nfc_3_2_wait_for_auto_write() - Waits for auto write to be writey for the CPU. + * + * This function returns 0 if everything went well. + * + * @this: Per-device data. + */ +static int nfc_3_2_wait_for_auto_write(struct imx_nfc_data *this) +{ + unsigned int first; + unsigned int last; + unsigned int index; + unsigned int chip; + unsigned int column; + unsigned int page; + uint32_t x; + int interrupt; + int transmitted; + int ready; + int return_value = 0; + void *primary_base = this->primary_regs; + void *secondary_base = this->secondary_regs; + + add_event("Entering nfc_3_2_wait_for_auto_write", 1); + + /* Get state. */ + + nfc_3_2_get_auto_loop_params(this, &first, &last, &index); + nfc_3_2_get_auto_addresses(this, 0, &chip, &column, &page); + + /* This function should be called for every chip. */ + + if ((index < first) || (index > last)) { + return_value = !0; + goto exit; + } + + /* Reset to buffer 0. */ + + raw_clr_mask_l(NFC_3_2_CONFIG1_RBA_MSK, + primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Launch the operation. */ + + nfc_3_2_add_state_events(this); + + add_event("Launching", 0); + + __raw_writel(NFC_3_2_LAUNCH_AUTO_PROG_MSK, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + + nfc_3_2_add_state_events(this); + + /* Wait for the NFC to transmit the page. */ + + add_event("Spinning while the NFC transmits the page...", 0); + + do + transmitted = !!raw_read_mask_l(NFC_3_2_IPC_AUTO_PROG_DONE_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + while (!transmitted); + + /* + * When control arrives here, the auto_prog_done bit is set. This + * indicates the NFC has finished transmitting the current page. The CPU + * is now free to write the next page into the NFC's memory. The Flash + * hardware is still busy programming the page into its storage array. + * + * Clear the auto_prog_done bit. This is analogous to acknowledging an + * interrupt. + */ + + nfc_3_2_add_state_events(this); + + add_event("Acknowledging the page...", 0); + + raw_clr_mask_l(NFC_3_2_IPC_AUTO_PROG_DONE_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + + nfc_3_2_add_state_events(this); + + /* + * If this is *not* the last iteration, move to the next chip and return + * to the caller so he can put the next page in the NFC buffer. + */ + + if (index < last) { + + add_event("Moving to the next chip...", 0); + + index++; + + nfc_3_2_set_auto_loop_params(this, first, last, index); + nfc_3_2_set_auto_addresses(this, 0, index, column, page); + + goto exit; + + } + + /* + * If control arrives here, this is the last iteration, so it's time to + * close out the entire operation. We need to wait for the medium to be + * ready and then acknowledge the final interrupt. + * + * Because of the way the NFC hardware works, the code here requires a + * bit of explanation. The most important rule is: + * + * During automatic operations, the NFC sets its + * interrupt bit *whenever* it sees the ready/busy + * signal transition from "Busy" to "Ready". + * + * Recall that the ready/busy signals from all the chips in the medium + * are "wire-anded." Thus, the NFC will only see that the medium is + * ready if *all* chips are ready. + * + * Because of variability in NAND Flash timing, the medium *may* have + * become ready during previous iterations, which means the interrupt + * bit *may* be set at this moment. This is a "left-over" interrupt, and + * can complicate our logic. + * + * The two bits of state that interest us here are the interrupt bit + * and the ready/busy bit. It boils down to the following truth table: + * + * | Interrupt | Ready/Busy | Description + * +------------+------------+--------------- + * | | | Busy medium and no left-over interrupt. + * | 0 | 0 | The final interrupt will arrive in the + * | | | future. + * +------------+------------+--------------- + * | | | Ready medium and no left-over interrupt. + * | 0 | 1 | There will be no final interrupt. This + * | | | case should be impossible. + * +------------+------------+--------------- + * | | | Busy medium and left-over interrupt. + * | 1 | 0 | The final interrupt will arrive in the + * | | | future. This is the hard case. + * +------------+------------+--------------- + * | | | Ready medium and left-over interrupt. + * | 1 | 1 | The final interrupt has already + * | | | arrived. Acknowledge it and exit. + * +------------+------------+--------------- + * + * Case #3 is a small problem. If we clear the interrupt, we may or may + * not have another interrupt following. + */ + + /* Sample the IPC register. */ + + x = __raw_readl(secondary_base + NFC_3_2_IPC_REG_OFF); + + interrupt = !!(x & NFC_3_2_IPC_INT_MSK); + ready = !!(x & NFC_3_2_IPC_RB_B_MSK); + + /* Check for the easy cases. */ + + if (!interrupt && !ready) { + add_event("Waiting for the final interrupt..." , 0); + nfc_util_wait_for_the_nfc(this, true); + goto exit; + } else if (!interrupt && ready) { + add_event("Done." , 0); + goto exit; + } else if (interrupt && ready) { + add_event("Acknowledging the final interrupt..." , 0); + nfc_util_wait_for_the_nfc(this, false); + goto exit; + + } + + /* + * If control arrives here, we hit case #3. Begin by acknowledging the + * interrupt we have right now. + */ + + add_event("Clearing the left-over interrupt..." , 0); + nfc_util_wait_for_the_nfc(this, false); + + /* + * Check the ready/busy bit again. If the medium is still busy, then + * we're going to get one more interrupt. + */ + + ready = !!raw_read_mask_l(NFC_3_2_IPC_RB_B_MSK, + secondary_base + NFC_3_2_IPC_REG_OFF); + + if (!ready) { + add_event("Waiting for the final interrupt..." , 0); + nfc_util_wait_for_the_nfc(this, true); + } + +exit: /* Return. */ + + add_event("Exiting nfc_3_2_wait_for_auto_write", -1); + + return return_value; + +} + +/** + * nfc_3_2_start_auto_erase() - Starts an automatic erase. + * + * This function returns 0 if everything went well. + * + * @this: Per-device data. + * @start: The first physical chip number on which to operate. + * @count: The number of physical chips on which to operate. + * @page: The page address. + */ +static int nfc_3_2_start_auto_erase(struct imx_nfc_data *this, + unsigned start, unsigned count, unsigned page) +{ + uint32_t x; + unsigned i; + int return_value = 0; + void *primary_base = this->primary_regs; + + add_event("Entering nfc_3_2_start_auto_erase", 1); + + /* Check for nonsense. */ + + if ((start > 7) || (!count) || (count > 8)) { + return_value = !0; + goto exit; + } + + /* Set up the commands. */ + + x = __raw_readl(primary_base + NFC_3_2_CMD_REG_OFF); + + x &= 0xffff0000; + x |= NAND_CMD_ERASE1 << 0; + x |= NAND_CMD_ERASE2 << 8; + + __raw_writel(x, primary_base + NFC_3_2_CMD_REG_OFF); + + /* Set the iterations. */ + + x = __raw_readl(primary_base + NFC_3_2_CONFIG1_REG_OFF); + + x &= ~NFC_3_2_CONFIG1_ITER_MSK; + x |= ((count - 1) << NFC_3_2_CONFIG1_ITER_POS) & + NFC_3_2_CONFIG1_ITER_MSK; + + __raw_writel(x, primary_base + NFC_3_2_CONFIG1_REG_OFF); + + /* Loop over chips, setting up the address groups. */ + + for (i = 0; i < count; i++) + nfc_3_2_set_auto_addresses(this, i, start + i, ~0, page); + + /* Launch the operation. */ + + add_event("Launching", 0); + + __raw_writel(NFC_3_2_LAUNCH_AUTO_ERASE_MSK, + primary_base + NFC_3_2_LAUNCH_REG_OFF); + +exit: /* Return. */ + + add_event("Exiting nfc_3_2_start_auto_erase", -1); + + return return_value; + +} + +/* + * At this point, we've defined all the version-specific primitives. We're now + * ready to construct the NFC HAL structures for every version. + */ + +struct nfc_hal nfc_1_0_hal = { + .major_version = 1, + .minor_version = 0, + .max_chip_count = 1, + .max_buffer_count = 4, + .spare_buf_stride = 16, + .has_secondary_regs = 0, + .can_be_symmetric = 0, + }; + +struct nfc_hal nfc_2_0_hal = { + .major_version = 2, + .minor_version = 0, + .max_chip_count = 1, + .max_buffer_count = 4, + .spare_buf_stride = 16, + .has_secondary_regs = false, + .can_be_symmetric = true, + .init = nfc_2_0_init, + .set_geometry = nfc_2_0_set_geometry, + .exit = nfc_2_x_exit, + .mask_interrupt = nfc_2_0_mask_interrupt, + .unmask_interrupt = nfc_2_0_unmask_interrupt, + .clear_interrupt = nfc_2_x_clear_interrupt, + .is_interrupting = nfc_2_x_is_interrupting, + .is_ready = 0, /* Ready/Busy not exposed. */ + .set_ecc = nfc_2_0_set_ecc, + .get_ecc_status = nfc_2_0_get_ecc_status, + .get_symmetric = nfc_2_0_get_symmetric, + .set_symmetric = nfc_2_0_set_symmetric, + .select_chip = nfc_2_0_select_chip, + .command_cycle = nfc_2_x_command_cycle, + .write_cycle = nfc_2_x_write_cycle, + .read_cycle = nfc_2_0_read_cycle, + .read_page = nfc_2_0_read_page, + .send_page = nfc_2_0_send_page, + .start_auto_read = 0, /* Not supported. */ + .wait_for_auto_read = 0, /* Not supported. */ + .resume_auto_read = 0, /* Not supported. */ + .start_auto_write = 0, /* Not supported. */ + .wait_for_auto_write = 0, /* Not supported. */ + .start_auto_erase = 0, /* Not supported. */ + }; + +struct nfc_hal nfc_2_1_hal = { + .major_version = 2, + .minor_version = 1, + .max_chip_count = 4, + .max_buffer_count = 8, + .spare_buf_stride = 64, + .has_secondary_regs = 0, + .can_be_symmetric = !0, + }; + +struct nfc_hal nfc_3_1_hal = { + .major_version = 3, + .minor_version = 1, + .max_chip_count = 4, + .max_buffer_count = 8, + .spare_buf_stride = 64, + .has_secondary_regs = !0, + .can_be_symmetric = !0, + }; + +struct nfc_hal nfc_3_2_hal = { + .major_version = 3, + .minor_version = 2, + .max_chip_count = 8, + .max_buffer_count = 8, + .spare_buf_stride = 64, + .has_secondary_regs = true, + .can_be_symmetric = true, + .init = nfc_3_2_init, + .set_geometry = nfc_3_2_set_geometry, + .exit = nfc_3_2_exit, + .set_closest_cycle = nfc_3_2_set_closest_cycle, + .mask_interrupt = nfc_3_2_mask_interrupt, + .unmask_interrupt = nfc_3_2_unmask_interrupt, + .clear_interrupt = nfc_3_2_clear_interrupt, + .is_interrupting = nfc_3_2_is_interrupting, + .is_ready = nfc_3_2_is_ready, + .set_force_ce = nfc_3_2_set_force_ce, + .set_ecc = nfc_3_2_set_ecc, + .get_ecc_status = nfc_3_2_get_ecc_status, + .get_symmetric = nfc_3_2_get_symmetric, + .set_symmetric = nfc_3_2_set_symmetric, + .select_chip = nfc_3_2_select_chip, + .command_cycle = nfc_3_2_command_cycle, + .write_cycle = nfc_3_2_write_cycle, + .read_cycle = nfc_3_2_read_cycle, + .read_page = nfc_3_2_read_page, + .send_page = nfc_3_2_send_page, + .start_auto_read = nfc_3_2_start_auto_read, + .wait_for_auto_read = nfc_3_2_wait_for_auto_read, + .resume_auto_read = nfc_3_2_resume_auto_read, + .start_auto_write = nfc_3_2_start_auto_write, + .wait_for_auto_write = nfc_3_2_wait_for_auto_write, + .start_auto_erase = nfc_3_2_start_auto_erase, + }; + +/* + * This array has a pointer to every NFC HAL structure. The probing process will + * find the one that matches the version given by the platform. + */ + +struct nfc_hal *(nfc_hals[]) = { + &nfc_1_0_hal, + &nfc_2_0_hal, + &nfc_2_1_hal, + &nfc_3_1_hal, + &nfc_3_2_hal, +}; + +/** + * mal_init() - Initialize the Medium Abstraction Layer. + * + * @this: Per-device data. + */ +static void mal_init(struct imx_nfc_data *this) +{ + this->interrupt_override = DRIVER_CHOICE; + this->auto_op_override = DRIVER_CHOICE; + this->inject_ecc_error = 0; +} + +/** + * mal_set_physical_geometry() - Set up the physical medium geometry. + * + * This function retrieves the physical geometry information discovered by + * nand_scan(), corrects it, and records it in the per-device data structure. + * + * @this: Per-device data. + */ +static int mal_set_physical_geometry(struct imx_nfc_data *this) +{ + struct mtd_info *mtd = &this->mtd; + struct nand_chip *nand = &this->nand; + struct device *dev = this->dev; + uint8_t manufacturer_id; + uint8_t device_id; + unsigned int block_size_in_pages; + unsigned int chip_size_in_blocks; + unsigned int chip_size_in_pages; + uint64_t medium_size_in_bytes; + struct physical_geometry *physical = &this->physical_geometry; + + /* + * Begin by transcribing exactly what the MTD code discovered. If there + * are any mistakes, we'll fix them in a moment. + */ + + physical->chip_count = nand->numchips; + physical->chip_size = nand->chipsize; + physical->block_size = mtd->erasesize; + physical->page_data_size = mtd->writesize; + physical->page_oob_size = mtd->oobsize; + + /* Read some of the ID bytes from the first NAND Flash chip. */ + + nand->select_chip(mtd, 0); + + nfc_util_send_cmd_and_addrs(this, NAND_CMD_READID, 0x00, -1); + + manufacturer_id = nand->read_byte(mtd); + device_id = nand->read_byte(mtd); + + /* + * Most manufacturers sell 4K page devices with 218 out-of-band bytes + * per page to accomodate ECC-8. + * + * Samsung and Hynix claim their parts have better reliability, so they + * only need ECC-4 and they have only 128 out-of-band bytes. + * + * The MTD code pays no attention to the manufacturer ID (something that + * eventually will have to change), so it believes that all 4K pages + * have 218 out-of-band bytes. + * + * We correct that mistake here. + */ + + if (physical->page_data_size == 4096) { + if ((manufacturer_id == NAND_MFR_SAMSUNG) || + (manufacturer_id == NAND_MFR_HYNIX)) { + physical->page_oob_size = 128; + } + } + + /* Compute some interesting facts. */ + + block_size_in_pages = + physical->block_size / physical->page_data_size; + chip_size_in_pages = + physical->chip_size >> (fls(physical->page_data_size) - 1); + chip_size_in_blocks = + physical->chip_size >> (fls(physical->block_size) - 1); + medium_size_in_bytes = + physical->chip_size * physical->chip_count; + + /* Report. */ + + dev_dbg(dev, "-----------------\n"); + dev_dbg(dev, "Physical Geometry\n"); + dev_dbg(dev, "-----------------\n"); + dev_dbg(dev, "Chip Count : %d\n", physical->chip_count); + dev_dbg(dev, "Page Data Size in Bytes: %u (0x%x)\n", + physical->page_data_size, physical->page_data_size); + dev_dbg(dev, "Page OOB Size in Bytes : %u\n", + physical->page_oob_size); + dev_dbg(dev, "Block Size in Bytes : %u (0x%x)\n", + physical->block_size, physical->block_size); + dev_dbg(dev, "Block Size in Pages : %u (0x%x)\n", + block_size_in_pages, block_size_in_pages); + dev_dbg(dev, "Chip Size in Bytes : %llu (0x%llx)\n", + physical->chip_size, physical->chip_size); + dev_dbg(dev, "Chip Size in Pages : %u (0x%x)\n", + chip_size_in_pages, chip_size_in_pages); + dev_dbg(dev, "Chip Size in Blocks : %u (0x%x)\n", + chip_size_in_blocks, chip_size_in_blocks); + dev_dbg(dev, "Medium Size in Bytes : %llu (0x%llx)\n", + medium_size_in_bytes, medium_size_in_bytes); + + /* Return success. */ + + return 0; + +} + +/** + * mal_set_nfc_geometry() - Set up the NFC geometry. + * + * This function calls the NFC HAL to select an NFC geometry that is compatible + * with the medium's physical geometry. + * + * @this: Per-device data. + */ +static int mal_set_nfc_geometry(struct imx_nfc_data *this) +{ + struct device *dev = this->dev; + struct nfc_geometry *nfc; + + /* Set the NFC geometry. */ + + if (this->nfc->set_geometry(this)) + return !0; + + /* Get a pointer to the new NFC geometry information. */ + + nfc = this->nfc_geometry; + + /* Report. */ + + dev_dbg(dev, "------------\n"); + dev_dbg(dev, "NFC Geometry\n"); + dev_dbg(dev, "------------\n"); + dev_dbg(dev, "Page Data Size in Bytes: %u (0x%x)\n", + nfc->page_data_size, nfc->page_data_size); + dev_dbg(dev, "Page OOB Size in Bytes : %u\n", nfc->page_oob_size); + dev_dbg(dev, "ECC Algorithm : %s\n", nfc->ecc_algorithm); + dev_dbg(dev, "ECC Strength : %d\n", nfc->ecc_strength); + dev_dbg(dev, "Buffer Count : %u\n", nfc->buffer_count); + dev_dbg(dev, "Spare Buffer Size : %u\n", nfc->spare_buf_size); + dev_dbg(dev, "Spare Buffer Spillover : %u\n", nfc->spare_buf_spill); + dev_dbg(dev, "Auto Read Available : %s\n", + this->nfc->start_auto_read ? "Yes" : "No"); + dev_dbg(dev, "Auto Write Available : %s\n", + this->nfc->start_auto_write ? "Yes" : "No"); + dev_dbg(dev, "Auto Erase Available : %s\n", + this->nfc->start_auto_erase ? "Yes" : "No"); + + /* Return success. */ + + return 0; + +} + +/** + * mal_set_logical_geometry() - Set up the logical medium geometry. + * + * This function constructs the logical geometry that we will expose to MTD, + * based on the physical and NFC geometries, and whether or not interleaving is + * on. + * + * @this: Per-device data. + */ +static int mal_set_logical_geometry(struct imx_nfc_data *this) +{ + const uint32_t max_medium_size_in_bytes = ~0; + int we_are_interleaving; + uint64_t physical_medium_size_in_bytes; + unsigned int usable_blocks; + unsigned int block_size_in_pages; + unsigned int chip_size_in_blocks; + unsigned int chip_size_in_pages; + unsigned int usable_medium_size_in_pages; + unsigned int usable_medium_size_in_blocks; + struct physical_geometry *physical = &this->physical_geometry; + struct nfc_geometry *nfc = this->nfc_geometry; + struct logical_geometry *logical = &this->logical_geometry; + struct device *dev = this->dev; + + /* Figure out if we're interleaving. */ + + we_are_interleaving = this->pdata->interleave; + + switch (imx_nfc_module_interleave_override) { + + case NEVER: + we_are_interleaving = false; + break; + + case DRIVER_CHOICE: + break; + + case ALWAYS: + we_are_interleaving = true; + break; + + } + + /* Compute the physical size of the medium. */ + + physical_medium_size_in_bytes = + physical->chip_count * physical->chip_size; + + /* Compute the logical geometry. */ + + if (!we_are_interleaving) { + + /* + * At this writing, MTD uses unsigned 32-bit variables to + * represent the size of the medium. If the physical medium is + * larger than that, the logical medium must be smaller. Here, + * we compute the total number of physical blocks in the medium + * that we can actually use. + */ + + if (physical_medium_size_in_bytes <= max_medium_size_in_bytes) { + usable_blocks = + physical_medium_size_in_bytes >> + (ffs(physical->block_size) - 1); + } else { + usable_blocks = + max_medium_size_in_bytes / physical->block_size; + } + + /* Set up the logical geometry. + * + * Notice that the usable medium size is not necessarily the + * same as the chip size multiplied by the number of physical + * chips. We can't afford to touch the physical chip size + * because the NAND Flash MTD code *requires* it to be a power + * of 2. + */ + + logical->chip_count = physical->chip_count; + logical->chip_size = physical->chip_size; + logical->usable_size = usable_blocks * physical->block_size; + logical->block_size = physical->block_size; + logical->page_data_size = nfc->page_data_size; + + /* Use the MTD layout that best matches the NFC geometry. */ + + logical->mtd_layout = &nfc->mtd_layout; + logical->page_oob_size = nfc->mtd_layout.eccbytes + + nfc->mtd_layout.oobavail; + + } else { + + /* + * If control arrives here, we are interleaving. Specifically, + * we are "horizontally concatenating" the pages in all the + * physical chips. + * + * - A logical page will be the size of a physical page + * multiplied by the number of physical chips. + * + * - A logical block will have the same number of pages as a + * physical block but, since the logical page size is larger, + * the logical block size is larger. + * + * - The entire medium will appear to be a single chip. + * + * At this writing, MTD uses unsigned 32-bit variables to + * represent the size of the medium. If the physical medium is + * larger than that, the logical medium must be smaller. + * + * The NAND Flash MTD code represents the size of a single chip + * as an unsigned 32-bit value. It also *requires* that the size + * of a chip be a power of two. Thus, the largest possible chip + * size is 2GiB. + * + * When interleaving, the entire medium appears to be one chip. + * Thus, when interleaving, the largest possible medium size is + * 2GiB. + */ + + if (physical_medium_size_in_bytes <= max_medium_size_in_bytes) { + logical->chip_size = + 0x1 << (fls(physical_medium_size_in_bytes) - 1); + } else { + logical->chip_size = + 0x1 << (fls(max_medium_size_in_bytes) - 1); + } + + /* + * If control arrives here, we're interleaving. The logical + * geometry is very different from the physical geometry. + */ + + logical->chip_count = 1; + logical->usable_size = logical->chip_size; + logical->block_size = + physical->block_size * physical->chip_count; + logical->page_data_size = + nfc->page_data_size * physical->chip_count; + + /* + * Since the logical geometry doesn't match the physical + * geometry, we can't use the MTD layout that matches the + * NFC geometry. We synthesize one here. + * + * Our "logical" OOB will be the concatenation of the first 5 + * bytes of the "physical" OOB of every chip. This has some + * important properties: + * + * - This will make the block mark of every physical chip + * visible (even for small page chips, which put their block + * mark in the 5th OOB byte). + * + * - None of the NFC controllers put ECC in the first 5 OOB + * bytes, so this layout exposes no ECC. + */ + + logical->page_oob_size = 5 * physical->chip_count; + + synthetic_layout.eccbytes = 0; + synthetic_layout.oobavail = 5 * physical->chip_count; + synthetic_layout.oobfree[0].offset = 0; + synthetic_layout.oobfree[0].length = synthetic_layout.oobavail; + + /* Install the synthetic layout. */ + + logical->mtd_layout = &synthetic_layout; + + } + + /* Compute some interesting facts. */ + + block_size_in_pages = logical->block_size / logical->page_data_size; + chip_size_in_pages = logical->chip_size / logical->page_data_size; + chip_size_in_blocks = logical->chip_size / logical->block_size; + usable_medium_size_in_pages = + logical->usable_size / logical->page_data_size; + usable_medium_size_in_blocks = + logical->usable_size / logical->block_size; + + /* Report. */ + + dev_dbg(dev, "----------------\n"); + dev_dbg(dev, "Logical Geometry\n"); + dev_dbg(dev, "----------------\n"); + dev_dbg(dev, "Chip Count : %d\n", logical->chip_count); + dev_dbg(dev, "Page Data Size in Bytes: %u (0x%x)\n", + logical->page_data_size, logical->page_data_size); + dev_dbg(dev, "Page OOB Size in Bytes : %u\n", + logical->page_oob_size); + dev_dbg(dev, "Block Size in Bytes : %u (0x%x)\n", + logical->block_size, logical->block_size); + dev_dbg(dev, "Block Size in Pages : %u (0x%x)\n", + block_size_in_pages, block_size_in_pages); + dev_dbg(dev, "Chip Size in Bytes : %u (0x%x)\n", + logical->chip_size, logical->chip_size); + dev_dbg(dev, "Chip Size in Pages : %u (0x%x)\n", + chip_size_in_pages, chip_size_in_pages); + dev_dbg(dev, "Chip Size in Blocks : %u (0x%x)\n", + chip_size_in_blocks, chip_size_in_blocks); + dev_dbg(dev, "Physical Size in Bytes : %llu (0x%llx)\n", + physical_medium_size_in_bytes, physical_medium_size_in_bytes); + dev_dbg(dev, "Usable Size in Bytes : %u (0x%x)\n", + logical->usable_size, logical->usable_size); + dev_dbg(dev, "Usable Size in Pages : %u (0x%x)\n", + usable_medium_size_in_pages, usable_medium_size_in_pages); + dev_dbg(dev, "Usable Size in Blocks : %u (0x%x)\n", + usable_medium_size_in_blocks, usable_medium_size_in_blocks); + + /* Return success. */ + + return 0; + +} + +/** + * mal_set_mtd_geometry() - Set up the MTD geometry. + * + * This function adjusts the owning MTD data structures to match the logical + * geometry we've chosen. + * + * @this: Per-device data. + */ +static int mal_set_mtd_geometry(struct imx_nfc_data *this) +{ + struct logical_geometry *logical = &this->logical_geometry; + struct mtd_info *mtd = &this->mtd; + struct nand_chip *nand = &this->nand; + + /* Configure the struct mtd_info. */ + + mtd->size = logical->usable_size; + mtd->erasesize = logical->block_size; + mtd->writesize = logical->page_data_size; + mtd->ecclayout = logical->mtd_layout; + mtd->oobavail = mtd->ecclayout->oobavail; + mtd->oobsize = mtd->ecclayout->oobavail + mtd->ecclayout->eccbytes; + mtd->subpage_sft = 0; /* We don't support sub-page writing. */ + + /* Configure the struct nand_chip. */ + + nand->numchips = logical->chip_count; + nand->chipsize = logical->chip_size; + nand->page_shift = ffs(logical->page_data_size) - 1; + nand->pagemask = (nand->chipsize >> nand->page_shift) - 1; + nand->subpagesize = mtd->writesize >> mtd->subpage_sft; + nand->phys_erase_shift = ffs(logical->block_size) - 1; + nand->bbt_erase_shift = nand->phys_erase_shift; + nand->chip_shift = ffs(logical->chip_size) - 1; + nand->oob_poi = nand->buffers->databuf+logical->page_data_size; + nand->ecc.layout = logical->mtd_layout; + + /* Set up the pattern that describes block marks. */ + + if (is_small_page_chip(this)) + nand->badblock_pattern = &small_page_block_mark_descriptor; + else + nand->badblock_pattern = &large_page_block_mark_descriptor; + + /* Return success. */ + + return 0; +} + +/** + * mal_set_geometry() - Set up the medium geometry. + * + * @this: Per-device data. + */ +static int mal_set_geometry(struct imx_nfc_data *this) +{ + + /* Set up the various layers of geometry, in this specific order. */ + + if (mal_set_physical_geometry(this)) + return !0; + + if (mal_set_nfc_geometry(this)) + return !0; + + if (mal_set_logical_geometry(this)) + return !0; + + if (mal_set_mtd_geometry(this)) + return !0; + + /* Return success. */ + + return 0; + +} + +/** + * mal_reset() - Resets the given chip. + * + * This is the fully-generalized reset operation, including support for + * interleaving. All reset operations funnel through here. + * + * @this: Per-device data. + * @chip: The logical chip of interest. + */ +static void mal_reset(struct imx_nfc_data *this, unsigned chip) +{ + int we_are_interleaving; + unsigned int start; + unsigned int end; + unsigned int i; + struct physical_geometry *physical = &this->physical_geometry; + struct logical_geometry *logical = &this->logical_geometry; + + add_event("Entering mal_get_status", 1); + + /* Establish some important facts. */ + + we_are_interleaving = logical->chip_count != physical->chip_count; + + /* Choose the loop bounds. */ + + if (we_are_interleaving) { + start = 0; + end = physical->chip_count; + } else { + start = chip; + end = start + 1; + } + + /* Loop over physical chips. */ + + add_event("Looping over physical chips...", 0); + + for (i = start; i < end; i++) { + + /* Select the current chip. */ + + this->nfc->select_chip(this, i); + + /* Reset the current chip. */ + + add_event("Resetting...", 0); + + nfc_util_send_cmd(this, NAND_CMD_RESET); + nfc_util_wait_for_the_nfc(this, false); + + } + + add_event("Exiting mal_get_status", -1); + +} + +/** + * mal_get_status() - Abstracted status retrieval. + * + * For media with a single chip, or concatenated chips, the HIL explicitly + * addresses a single chip at a time and wants the status from that chip only. + * + * For interleaved media, we must combine the individual chip states. At this + * writing, the NAND MTD system knows about the following bits in status + * registers: + * + * +------------------------+-------+---------+ + * | | | Combine | + * | Macro | Value | With | + * +------------------------+-------+---------+ + * | NAND_STATUS_FAIL | 0x01 | OR | + * | NAND_STATUS_FAIL_N1 | 0x02 | OR | + * | NAND_STATUS_TRUE_READY | 0x20 | AND | + * | NAND_STATUS_READY | 0x40 | AND | + * | NAND_STATUS_WP | 0x80 | AND | + * +------------------------+-------+---------+ + * + * @this: Per-device data. + * @chip: The logical chip of interest. + */ +static uint8_t mal_get_status(struct imx_nfc_data *this, unsigned chip) +{ + int we_are_interleaving; + unsigned int start; + unsigned int end; + unsigned int i; + unsigned int x; + unsigned int or_mask; + unsigned int and_mask; + uint8_t status; + struct physical_geometry *physical = &this->physical_geometry; + struct logical_geometry *logical = &this->logical_geometry; + + add_event("Entering mal_get_status", 1); + + /* Establish some important facts. */ + + we_are_interleaving = logical->chip_count != physical->chip_count; + + /* Compute the masks we need. */ + + or_mask = NAND_STATUS_FAIL | NAND_STATUS_FAIL_N1; + and_mask = NAND_STATUS_TRUE_READY | NAND_STATUS_READY | NAND_STATUS_WP; + + /* Assume the chip is successful, ready and writeable. */ + + status = and_mask & ~or_mask; + + /* Choose the loop bounds. */ + + if (we_are_interleaving) { + start = 0; + end = physical->chip_count; + } else { + start = chip; + end = start + 1; + } + + /* Loop over physical chips. */ + + add_event("Looping over physical chips...", 0); + + for (i = start; i < end; i++) { + + /* Select the current chip. */ + + this->nfc->select_chip(this, i); + + /* Get the current chip's status. */ + + add_event("Sending the command...", 0); + + nfc_util_send_cmd(this, NAND_CMD_STATUS); + nfc_util_wait_for_the_nfc(this, false); + + add_event("Reading the status...", 0); + + x = this->nfc->read_cycle(this); + + /* Fold this chip's status into the combined status. */ + + status |= (x & or_mask); + status &= (x & and_mask) | or_mask; + + } + + add_event("Exiting mal_get_status", -1); + + return status; + +} + +/** + * mal_read_a_page() - Abstracted page read. + * + * This function returns the ECC status for the entire read operation. A + * positive return value indicates the number of errors that were corrected + * (symbol errors for Reed-Solomon hardware engines, bit errors for BCH hardware + * engines). A negative return value indicates that the ECC engine failed to + * correct all errors and the data is corrupted. A zero return value indicates + * there were no errors at all. + * + * @this: Per-device data. + * @use_ecc: Indicates if we're to use ECC. + * @chip: The logical chip of interest. + * @page: The logical page number to read. + * @data: A pointer to the destination data buffer. If this pointer is null, + * that indicates the caller doesn't want the data. + * @oob: A pointer to the destination OOB buffer. If this pointer is null, + * that indicates the caller doesn't want the OOB. + */ +static int mal_read_a_page(struct imx_nfc_data *this, int use_ecc, + unsigned chip, unsigned page, uint8_t *data, uint8_t *oob) +{ + int we_are_interleaving; + int use_automatic_op; + unsigned int start; + unsigned int end; + unsigned int current_chip; + unsigned int oob_bytes_to_copy; + unsigned int data_bytes_to_copy; + int status; + unsigned int worst_case_ecc_status; + int return_value = 0; + struct physical_geometry *physical = &this->physical_geometry; + struct nfc_geometry *nfc = this->nfc_geometry; + struct logical_geometry *logical = &this->logical_geometry; + + add_event("Entering mal_read_a_page", 1); + + /* Establish some important facts. */ + + we_are_interleaving = logical->chip_count != physical->chip_count; + use_automatic_op = !!this->nfc->start_auto_read; + + /* Apply the automatic operation override, if any. */ + + switch (this->auto_op_override) { + + case NEVER: + use_automatic_op = false; + break; + + case DRIVER_CHOICE: + break; + + case ALWAYS: + if (this->nfc->start_auto_read) + use_automatic_op = true; + break; + + } + + /* Set up ECC. */ + + this->nfc->set_ecc(this, use_ecc); + + /* Check if we're interleaving and set up the loop iterations. */ + + if (we_are_interleaving) { + + start = 0; + end = physical->chip_count; + + data_bytes_to_copy = + this->logical_geometry.page_data_size / + this->physical_geometry.chip_count; + oob_bytes_to_copy = + this->logical_geometry.page_oob_size / + this->physical_geometry.chip_count; + + } else { + + start = chip; + end = start + 1; + + data_bytes_to_copy = this->logical_geometry.page_data_size; + oob_bytes_to_copy = this->logical_geometry.page_oob_size; + + } + + /* If we're using the automatic operation, start it now. */ + + if (use_automatic_op) { + add_event("Starting the automatic operation...", 0); + this->nfc->start_auto_read(this, start, end - start, 0, page); + } + + /* Loop over physical chips. */ + + add_event("Looping over physical chips...", 0); + + for (current_chip = start; current_chip < end; current_chip++) { + + /* Check if we're using the automatic operation. */ + + if (use_automatic_op) { + + add_event("Waiting...", 0); + this->nfc->wait_for_auto_read(this); + + } else { + + /* Select the current chip. */ + + this->nfc->select_chip(this, current_chip); + + /* Set up the chip. */ + + add_event("Sending the command and addresses...", 0); + + nfc_util_send_cmd_and_addrs(this, + NAND_CMD_READ0, 0, page); + + if (is_large_page_chip(this)) { + add_event("Sending the final command...", 0); + nfc_util_send_cmd(this, NAND_CMD_READSTART); + } + + /* Wait till the page is ready. */ + + add_event("Waiting for the page to arrive...", 0); + + nfc_util_wait_for_the_nfc(this, true); + + /* Read the page. */ + + add_event("Reading the page...", 0); + + this->nfc->read_page(this); + + } + + /* Copy a page out of the NFC. */ + + add_event("Copying from the NFC...", 0); + + if (oob) { + nfc_util_copy_from_the_nfc(this, + nfc->page_data_size, oob, oob_bytes_to_copy); + oob += oob_bytes_to_copy; + } + + if (data) { + nfc_util_copy_from_the_nfc(this, + 0, data, data_bytes_to_copy); + data += data_bytes_to_copy; + } + + /* + * If we're using ECC, and we haven't already seen an ECC + * failure, continue to gather ECC status. Note that, if we + * *do* see an ECC failure, we continue to read because the + * client might want the data for forensic purposes. + */ + + if (use_ecc && (return_value >= 0)) { + + add_event("Getting ECC status...", 0); + + status = this->nfc->get_ecc_status(this); + + if (status >= 0) + return_value += status; + else + return_value = -1; + + } + + /* Check if we're using the automatic operation. */ + + if (use_automatic_op) { + + /* + * If this is not the last iteration, resume the + * automatic operation. + */ + + if (current_chip < (end - 1)) { + add_event("Resuming...", 0); + this->nfc->resume_auto_read(this); + } + + } + + } + + /* Check if we're supposed to inject an ECC error. */ + + if (use_ecc && this->inject_ecc_error) { + + /* Inject the appropriate error. */ + + if (this->inject_ecc_error < 0) { + + add_event("Injecting an uncorrectable error...", 0); + + return_value = -1; + + } else { + + add_event("Injecting correctable errors...", 0); + + worst_case_ecc_status = + physical->chip_count * + nfc->buffer_count * + nfc->ecc_strength; + + if (this->inject_ecc_error > worst_case_ecc_status) + return_value = worst_case_ecc_status; + else + return_value = this->inject_ecc_error; + + } + + /* Stop injecting further errors. */ + + this->inject_ecc_error = 0; + + } + + /* Return. */ + + add_event("Exiting mal_read_a_page", -1); + + return return_value; + +} + +/** + * mal_write_a_page() - Abstracted page write. + * + * This function returns zero if the operation succeeded, or -EIO if the + * operation failed. + * + * @this: Per-device data. + * @use_ecc: Indicates if we're to use ECC. + * @chip: The logical chip of interest. + * @page: The logical page number to write. + * @data: A pointer to the source data buffer. + * @oob: A pointer to the source OOB buffer. + */ +static int mal_write_a_page(struct imx_nfc_data *this, int use_ecc, + unsigned chip, unsigned page, const uint8_t *data, const uint8_t *oob) +{ + int we_are_interleaving; + int use_automatic_op; + unsigned int start; + unsigned int end; + unsigned int current_chip; + unsigned int oob_bytes_to_copy; + unsigned int data_bytes_to_copy; + int return_value = 0; + struct physical_geometry *physical = &this->physical_geometry; + struct nfc_geometry *nfc = this->nfc_geometry; + struct logical_geometry *logical = &this->logical_geometry; + + add_event("Entering mal_write_a_page", 1); + + /* Establish some important facts. */ + + we_are_interleaving = logical->chip_count != physical->chip_count; + use_automatic_op = !!this->nfc->start_auto_write; + + /* Apply the automatic operation override, if any. */ + + switch (this->auto_op_override) { + + case NEVER: + use_automatic_op = false; + break; + + case DRIVER_CHOICE: + break; + + case ALWAYS: + if (this->nfc->start_auto_write) + use_automatic_op = true; + break; + + } + + /* Set up ECC. */ + + this->nfc->set_ecc(this, use_ecc); + + /* Check if we're interleaving and set up the loop iterations. */ + + if (we_are_interleaving) { + + start = 0; + end = physical->chip_count; + + data_bytes_to_copy = + this->logical_geometry.page_data_size / + this->physical_geometry.chip_count; + oob_bytes_to_copy = + this->logical_geometry.page_oob_size / + this->physical_geometry.chip_count; + + } else { + + start = chip; + end = start + 1; + + data_bytes_to_copy = this->logical_geometry.page_data_size; + oob_bytes_to_copy = this->logical_geometry.page_oob_size; + + } + + /* If we're using the automatic operation, start the hardware now. */ + + if (use_automatic_op) { + add_event("Starting the automatic operation...", 0); + this->nfc->start_auto_write(this, start, end - start, 0, page); + } + + /* Loop over physical chips. */ + + add_event("Looping over physical chips...", 0); + + for (current_chip = start; current_chip < end; current_chip++) { + + /* Copy a page into the NFC. */ + + add_event("Copying to the NFC...", 0); + + nfc_util_copy_to_the_nfc(this, oob, nfc->page_data_size, + oob_bytes_to_copy); + oob += oob_bytes_to_copy; + + nfc_util_copy_to_the_nfc(this, data, 0, data_bytes_to_copy); + + data += data_bytes_to_copy; + + /* Check if we're using the automatic operation. */ + + if (use_automatic_op) { + + /* Wait for the write operation to finish. */ + + add_event("Waiting...", 0); + + this->nfc->wait_for_auto_write(this); + + } else { + + /* Select the current chip. */ + + this->nfc->select_chip(this, current_chip); + + /* Set up the chip. */ + + add_event("Sending the command and addresses...", 0); + + nfc_util_send_cmd_and_addrs(this, + NAND_CMD_SEQIN, 0, page); + + /* Send the page. */ + + add_event("Sending the page...", 0); + + this->nfc->send_page(this); + + /* Start programming the page. */ + + add_event("Programming the page...", 0); + + nfc_util_send_cmd(this, NAND_CMD_PAGEPROG); + + /* Wait until the page is finished. */ + + add_event("Waiting...", 0); + + nfc_util_wait_for_the_nfc(this, true); + + } + + } + + /* Get status. */ + + add_event("Gathering status...", 0); + + if (mal_get_status(this, chip) & NAND_STATUS_FAIL) { + add_event("Bad status", 0); + return_value = -EIO; + } else { + add_event("Good status", 0); + } + + /* Return. */ + + add_event("Exiting mal_write_a_page", -1); + + return return_value; + +} + +/** + * mal_erase_a_block() - Abstract block erase operation. + * + * Note that this function does *not* wait for the operation to finish. The + * caller is expected to call waitfunc() at some later time. + * + * @this: Per-device data. + * @chip: The logical chip of interest. + * @page: A logical page address that identifies the block to erase. + */ +static void mal_erase_a_block(struct imx_nfc_data *this, + unsigned chip, unsigned page) +{ + int we_are_interleaving; + int use_automatic_op; + unsigned int start; + unsigned int end; + unsigned int i; + struct physical_geometry *physical = &this->physical_geometry; + struct logical_geometry *logical = &this->logical_geometry; + + add_event("Entering mal_erase_a_block", 1); + + /* Establish some important facts. */ + + we_are_interleaving = logical->chip_count != physical->chip_count; + use_automatic_op = !!this->nfc->start_auto_erase; + + /* Apply the automatic operation override, if any. */ + + switch (this->auto_op_override) { + + case NEVER: + use_automatic_op = false; + break; + + case DRIVER_CHOICE: + break; + + case ALWAYS: + if (this->nfc->start_auto_erase) + use_automatic_op = true; + break; + + } + + /* Choose the loop bounds. */ + + if (we_are_interleaving) { + start = 0; + end = physical->chip_count; + } else { + start = chip; + end = start + 1; + } + + /* Check if we're using the automatic operation. */ + + if (use_automatic_op) { + + /* + * Start the operation. Note that we don't wait for it to + * finish because the HIL will call our waitfunc(). + */ + + add_event("Starting the automatic operation...", 0); + + this->nfc->start_auto_erase(this, start, end - start, page); + + } else { + + /* Loop over physical chips. */ + + add_event("Looping over physical chips...", 0); + + for (i = start; i < end; i++) { + + /* Select the current chip. */ + + this->nfc->select_chip(this, i); + + /* Set up the chip. */ + + nfc_util_send_cmd_and_addrs(this, + NAND_CMD_ERASE1, -1, page); + + /* Start the erase. */ + + nfc_util_send_cmd(this, NAND_CMD_ERASE2); + + /* + * If this is the last time through the loop, break out + * now so we don't try to wait (the HIL will call our + * waitfunc() for the final wait). + */ + + if (i >= (end - 1)) + break; + + /* Wait for the erase on the current chip to finish. */ + + nfc_util_wait_for_the_nfc(this, true); + + } + + } + + add_event("Exiting mal_erase_a_block", -1); + +} + +/** + * mal_is_block_bad() - Abstract bad block check. + * + * @this: Per-device data. + * @chip: The logical chip of interest. + * @page: The logical page number to read. + */ + #if 0 + +/* TODO: Finish this function and plug it in. */ + +static int mal_is_block_bad(struct imx_nfc_data *this, + unsigned chip, unsigned page) +{ + int we_are_interleaving; + unsigned int start; + unsigned int end; + unsigned int i; + uint8_t *p; + int return_value = 0; + struct nand_chip *nand = &this->nand; + struct physical_geometry *physical = &this->physical_geometry; + struct logical_geometry *logical = &this->logical_geometry; + + /* Figure out if we're interleaving. */ + + we_are_interleaving = logical->chip_count != physical->chip_count; + + /* + * We're about to use the NAND Flash MTD layer's buffer, so invalidate + * the page cache. + */ + + this->nand.pagebuf = -1; + + /* + * Read the OOB of the given page, using the NAND Flash MTD's buffer. + * + * Notice that ECC is off, which it *must* be when scanning block marks. + */ + + mal_read_a_page(this, false, + this->current_chip, this->page_address, 0, nand->oob_poi); + + /* Choose the loop bounds. */ + + if (we_are_interleaving) { + start = 0; + end = physical->chip_count; + } else { + start = chip; + end = start + 1; + } + + /* Start scanning at the beginning of the OOB data. */ + + p = nand->oob_poi; + + /* Loop over physical chips. */ + + add_event("Looping over physical chips...", 0); + + for (i = start; i < end; i++, p += 5) { + + /* Examine the OOB for this chip. */ + + if (p[nand->badblockpos] != 0xff) { + return_value = !0; + break; + } + + } + + /* Return. */ + + return return_value; + +} +#endif + +/** + * mil_init() - Initializes the MTD Interface Layer. + * + * @this: Per-device data. + */ +static void mil_init(struct imx_nfc_data *this) +{ + this->current_chip = -1; /* No chip is selected yet. */ + this->command_is_new = false; /* No command yet. */ +} + +/** + * mil_cmd_ctrl() - MTD Interface cmd_ctrl() + * + * @mtd: A pointer to the owning MTD. + * @dat: The data signals to present to the chip. + * @ctrl: The control signals to present to the chip. + */ +static void mil_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); +} + +/** + * mil_dev_ready() - MTD Interface dev_ready() + * + * @mtd: A pointer to the owning MTD. + */ +static int mil_dev_ready(struct mtd_info *mtd) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc dev_ready]\n"); + + add_event("Entering mil_dev_ready", 1); + + if (this->nfc->is_ready(this)) { + add_event("Exiting mil_dev_ready - Returning ready", -1); + return !0; + } else { + add_event("Exiting mil_dev_ready - Returning busy", -1); + return 0; + } + +} + +/** + * mil_select_chip() - MTD Interface select_chip() + * + * @mtd: A pointer to the owning MTD. + * @chip: The chip number to select, or -1 to select no chip. + */ +static void mil_select_chip(struct mtd_info *mtd, int chip) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc select_chip] chip: %d\n", chip); + + /* Figure out what kind of transition this is. */ + + if ((this->current_chip < 0) && (chip >= 0)) { + start_event_trace("Entering mil_select_chip"); + if (this->pdata->force_ce) + this->nfc->set_force_ce(this, true); + clk_enable(this->clock); + add_event("Exiting mil_select_chip", -1); + } else if ((this->current_chip >= 0) && (chip < 0)) { + add_event("Entering mil_select_chip", 1); + if (this->pdata->force_ce) + this->nfc->set_force_ce(this, false); + clk_disable(this->clock); + stop_event_trace("Exiting mil_select_chip"); + } else { + add_event("Entering mil_select_chip", 1); + add_event("Exiting mil_select_chip", -1); + } + + this->current_chip = chip; + +} + +/** + * mil_cmdfunc() - MTD Interface cmdfunc() + * + * This function handles NAND Flash command codes from the HIL. Since only the + * HIL calls this function (none of the reference implementations we use do), it + * needs to handle very few command codes. + * + * @mtd: A pointer to the owning MTD. + * @command: The command code. + * @column: The column address associated with this command code, or -1 if no + * column address applies. + * @page: The page address associated with this command code, or -1 if no + * page address applies. + */ +static void mil_cmdfunc(struct mtd_info *mtd, + unsigned command, int column, int page) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc cmdfunc] command: 0x%02x, " + "column: 0x%04x, page: 0x%06x\n", command, column, page); + + add_event("Entering mil_cmdfunc", 1); + + /* Record the command and the fact that it hasn't yet been sent. */ + + this->command = command; + this->command_is_new = true; + + /* + * Process the command code. + * + * Note the default case to trap unrecognized codes. Thus, every command + * we support must have a case here, even if we don't have to do any + * pre-processing work. If the HIL changes and starts sending commands + * we haven't explicitly implemented, this will warn us. + */ + + switch (command) { + + case NAND_CMD_READ0: + add_event("NAND_CMD_READ0", 0); + /* + * After calling this function to send the command and + * addresses, the HIL will call ecc.read_page() or + * ecc.read_page_raw() to collect the data. + * + * The column address from the HIL is always zero. The only + * information we need to keep from this call is the page + * address. + */ + this->page_address = page; + break; + + case NAND_CMD_STATUS: + add_event("NAND_CMD_STATUS", 0); + /* + * After calling this function to send the command, the HIL + * will call read_byte() once to collect the status. + */ + break; + + case NAND_CMD_READID: + add_event("NAND_CMD_READID", 0); + /* + * After calling this function to send the command, the HIL + * will call read_byte() repeatedly to collect ID bytes. + */ + break; + + case NAND_CMD_RESET: + add_event("NAND_CMD_RESET", 0); + mal_reset(this, this->current_chip); + break; + + default: + dev_emerg(this->dev, "Unsupported NAND Flash command code: " + "0x%02x\n", command); + BUG(); + break; + + } + + add_event("Exiting mil_cmdfunc", -1); + +} + +/** + * mil_waitfunc() - MTD Interface waifunc() + * + * This function blocks until the current chip is ready and then returns the + * contents of the chip's status register. The HIL only calls this function + * after starting an erase operation. + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + */ +static int mil_waitfunc(struct mtd_info *mtd, struct nand_chip *nand) +{ + int status; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc waitfunc]\n"); + + add_event("Entering mil_waitfunc", 1); + + /* Wait for the NFC to finish. */ + + nfc_util_wait_for_the_nfc(this, true); + + /* Get the status. */ + + status = mal_get_status(this, this->current_chip); + + add_event("Exiting mil_waitfunc", -1); + + return status; + +} + +/** + * mil_read_byte() - MTD Interface read_byte(). + * + * @mtd: A pointer to the owning MTD. + */ +static uint8_t mil_read_byte(struct mtd_info *mtd) +{ + uint8_t byte = 0; + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + + add_event("Entering mil_read_byte", 1); + + /* + * The command sent by the HIL before it called this function determines + * how we get the byte we're going to return. + */ + + switch (this->command) { + + case NAND_CMD_STATUS: + add_event("NAND_CMD_STATUS", 0); + byte = mal_get_status(this, this->current_chip); + break; + + case NAND_CMD_READID: + add_event("NAND_CMD_READID", 0); + + /* + * Check if the command is new. If so, then the HIL just + * recently called cmdfunc(), so the current chip isn't selected + * and the command hasn't been sent to the chip. + */ + + if (this->command_is_new) { + add_event("Sending the \"Read ID\" command...", 0); + this->nfc->select_chip(this, this->current_chip); + nfc_util_send_cmd_and_addrs(this, + NAND_CMD_READID, 0, -1); + this->command_is_new = false; + } + + /* Read the ID byte. */ + + add_event("Reading the ID byte...", 0); + + byte = this->nfc->read_cycle(this); + + break; + + default: + dev_emerg(this->dev, "Unsupported NAND Flash command code: " + "0x%02x\n", this->command); + BUG(); + break; + + } + + DEBUG(MTD_DEBUG_LEVEL2, + "[imx_nfc read_byte] Returning: 0x%02x\n", byte); + + add_event("Exiting mil_read_byte", -1); + + return byte; + +} + +/** + * mil_read_word() - MTD Interface read_word(). + * + * @mtd: A pointer to the owning MTD. + */ +static uint16_t mil_read_word(struct mtd_info *mtd) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); + return 0; +} + +/** + * mil_read_buf() - MTD Interface read_buf(). + * + * @mtd: A pointer to the owning MTD. + * @buf: The destination buffer. + * @len: The number of bytes to read. + */ +static void mil_read_buf(struct mtd_info *mtd, uint8_t * buf, int len) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); +} + +/** + * mil_write_buf() - MTD Interface write_buf(). + * + * @mtd: A pointer to the owning MTD. + * @buf: The source buffer. + * @len: The number of bytes to read. + */ +static void mil_write_buf(struct mtd_info *mtd, const uint8_t * buf, int len) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); +} + +/** + * mil_verify_buf() - MTD Interface verify_buf(). + * + * @mtd: A pointer to the owning MTD. + * @buf: The destination buffer. + * @len: The number of bytes to read. + */ +static int mil_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); + return 0; +} + +/** + * mil_ecc_hwctl() - MTD Interface ecc.hwctl(). + * + * @mtd: A pointer to the owning MTD. + * @mode: The ECC mode. + */ +static void mil_ecc_hwctl(struct mtd_info *mtd, int mode) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); +} + +/** + * mil_ecc_calculate() - MTD Interface ecc.calculate(). + * + * @mtd: A pointer to the owning MTD. + * @dat: A pointer to the source data. + * @ecc_code: A pointer to a buffer that will receive the resulting ECC. + */ +static int mil_ecc_calculate(struct mtd_info *mtd, + const uint8_t *dat, uint8_t *ecc_code) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); + return 0; +} + +/** + * mil_ecc_correct() - MTD Interface ecc.correct(). + * + * @mtd: A pointer to the owning MTD. + * @dat: A pointer to the source data. + * @read_ecc: A pointer to the ECC that was read from the medium. + * @calc_ecc: A pointer to the ECC that was calculated for the source data. + */ +static int mil_ecc_correct(struct mtd_info *mtd, + uint8_t *dat, uint8_t *read_ecc, uint8_t *calc_ecc) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); + return 0; +} + +/** + * mil_ecc_read_page() - MTD Interface ecc.read_page(). + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + * @buf: A pointer to the destination buffer. + */ +static int mil_ecc_read_page(struct mtd_info *mtd, + struct nand_chip *nand, uint8_t *buf) +{ + int ecc_status; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc ecc_read_page]\n"); + + add_event("Entering mil_ecc_read_page", 1); + + /* Read the page. */ + + ecc_status = + mal_read_a_page(this, true, this->current_chip, + this->page_address, buf, nand->oob_poi); + + /* Propagate ECC information. */ + + if (ecc_status < 0) { + add_event("ECC Failure", 0); + mtd->ecc_stats.failed++; + } else if (ecc_status > 0) { + add_event("ECC Corrections", 0); + mtd->ecc_stats.corrected += ecc_status; + } + + add_event("Exiting mil_ecc_read_page", -1); + + return 0; + +} + +/** + * mil_ecc_read_page_raw() - MTD Interface ecc.read_page_raw(). + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + * @buf: A pointer to the destination buffer. + */ +static int mil_ecc_read_page_raw(struct mtd_info *mtd, + struct nand_chip *nand, uint8_t *buf) +{ + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc ecc_read_page_raw]\n"); + + add_event("Entering mil_ecc_read_page_raw", 1); + + mal_read_a_page(this, false, this->current_chip, + this->page_address, buf, nand->oob_poi); + + add_event("Exiting mil_ecc_read_page_raw", -1); + + return 0; + +} + +/** + * mil_ecc_write_page() - MTD Interface ecc.write_page(). + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + * @buf: A pointer to the source buffer. + */ +static void mil_ecc_write_page(struct mtd_info *mtd, + struct nand_chip *nand, const uint8_t *buf) +{ + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); +} + +/** + * mil_ecc_write_page_raw() - MTD Interface ecc.write_page_raw(). + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + * @buf: A pointer to the source buffer. + */ +static void mil_ecc_write_page_raw(struct mtd_info *mtd, + struct nand_chip *nand, const uint8_t *buf) +{ + struct imx_nfc_data *this = nand->priv; + unimplemented(this, __func__); +} + +/** + * mil_write_page() - MTD Interface ecc.write_page(). + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + * @buf: A pointer to the source buffer. + * @page: The page number to write. + * @cached: Indicates cached programming (ignored). + * @raw: Indicates not to use ECC. + */ +static int mil_write_page(struct mtd_info *mtd, + struct nand_chip *nand, const uint8_t *buf, + int page, int cached, int raw) +{ + int return_value; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc write_page]\n"); + + add_event("Entering mil_write_page", 1); + + return_value = mal_write_a_page(this, !raw, + this->current_chip, page, buf, nand->oob_poi); + + add_event("Exiting mil_write_page", -1); + + return return_value; + +} + +/** + * mil_ecc_read_oob() - MTD Interface read_oob(). + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + * @page: The page number to read. + * @sndcmd: Indicates this function should send a command to the chip before + * reading the out-of-band bytes. This is only false for small page + * chips that support auto-increment. + */ +static int mil_ecc_read_oob(struct mtd_info *mtd, struct nand_chip *nand, + int page, int sndcmd) +{ + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc ecc_read_oob] " + "page: 0x%06x, sndcmd: %s\n", page, sndcmd ? "Yes" : "No"); + + add_event("Entering mil_ecc_read_oob", 1); + + mal_read_a_page(this, false, + this->current_chip, page, 0, nand->oob_poi); + + add_event("Exiting mil_ecc_read_oob", -1); + + /* + * Return true, indicating that the next call to this function must send + * a command. + */ + + return true; + +} + +/** + * mil_ecc_write_oob() - MTD Interface write_oob(). + * + * @mtd: A pointer to the owning MTD. + * @nand: A pointer to the owning NAND Flash MTD. + * @page: The page number to write. + */ +static int mil_ecc_write_oob(struct mtd_info *mtd, + struct nand_chip *nand, int page) +{ + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc ecc_write_oob] page: 0x%06x\n", page); + + /* + * There are fundamental incompatibilities between the i.MX NFC and the + * NAND Flash MTD model that make it essentially impossible to write the + * out-of-band bytes. + */ + + dev_emerg(this->dev, "This driver doesn't support writing the OOB\n"); + WARN_ON(1); + + /* Return status. */ + + return -EIO; + +} + +/** + * mil_erase_cmd() - MTD Interface erase_cmd(). + * + * We set the erase_cmd pointer in struct nand_chip to point to this function. + * Thus, the HIL will call here for all erase operations. + * + * Strictly speaking, since the erase_cmd pointer is marked "Internal," we + * shouldn't be doing this. However, the only reason the HIL uses that pointer + * is to install a different function for erasing conventional NAND Flash or AND + * Flash. Since AND Flash is obsolete and we don't support it, this isn't + * important. + * + * Furthermore, to cleanly implement interleaving (which is critical to speeding + * up erase operations), we want to "hook into" the operation at the highest + * semantic level possible. If we don't hook this function, then the only way + * we'll know that an erase is happening is when the HIL calls cmdfunc() with + * an erase command. Implementing interleaving at that level is roughly a + * billion times less desirable. + * + * This function does *not* wait for the operation to finish. The HIL will call + * waitfunc() later to wait for the operation to finish. + * + * @mtd: A pointer to the owning MTD. + * @page: A page address that identifies the block to erase. + */ +static void mil_erase_cmd(struct mtd_info *mtd, int page) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc erase_cmd] page: 0x%06x\n", page); + + add_event("Entering mil_erase_cmd", 1); + + mal_erase_a_block(this, this->current_chip, page); + + add_event("Exiting mil_erase_cmd", -1); + +} + +/** + * mil_block_bad() - MTD Interface block_bad(). + * + * @mtd: A pointer to the owning MTD. + * @ofs: The offset of the block of interest, from the start of the medium. + * @getchip: Indicates this function must acquire the MTD before using it. + */ +#if 0 + +/* TODO: Finish this function and plug it in. */ + +static int mil_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip) +{ + unsigned int chip; + unsigned int page; + int return_value; + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc block_bad] page: 0x%06x\n", page); + + add_event("Entering mil_block_bad", 1); + + /* Compute the logical chip number that contains the given offset. */ + + chip = (unsigned int) (ofs >> nand->chip_shift); + + /* Compute the logical page address within the logical chip. */ + + page = ((unsigned int) (ofs >> nand->page_shift)) & nand->pagemask; + + /* Check if the block is bad. */ + + return_value = mal_is_block_bad(this, chip, page); + + if (return_value) + add_event("Bad block", 0); + + /* Return. */ + + add_event("Exiting mil_block_bad", -1); + + return return_value; + +} +#endif + +/** + * mil_scan_bbt() - MTD Interface scan_bbt(). + * + * The HIL calls this function once, when it initializes the NAND Flash MTD. + * + * Nominally, the purpose of this function is to look for or create the bad + * block table. In fact, since the HIL calls this function at the very end of + * the initialization process started by nand_scan(), and the HIL doesn't have a + * more formal mechanism, everyone "hooks" this function to continue the + * initialization process. + * + * At this point, the physical NAND Flash chips have been identified and + * counted, so we know the physical geometry. This enables us to make some + * important configuration decisions. + * + * The return value of this function propogates directly back to this driver's + * call to nand_scan(). Anything other than zero will cause this driver to + * tear everything down and declare failure. + * + * @mtd: A pointer to the owning MTD. + */ +static int mil_scan_bbt(struct mtd_info *mtd) +{ + struct nand_chip *nand = mtd->priv; + struct imx_nfc_data *this = nand->priv; + + DEBUG(MTD_DEBUG_LEVEL2, "[imx_nfc scan_bbt] \n"); + + add_event("Entering mil_scan_bbt", 1); + + /* + * We replace the erase_cmd() function that the MTD NAND Flash system + * has installed with our own. See mil_erase_cmd() for the reasons. + */ + + nand->erase_cmd = mil_erase_cmd; + + /* + * Tell MTD users that the out-of-band area can't be written. + * + * This flag is not part of the standard kernel source tree. It comes + * from a patch that touches both MTD and JFFS2. + * + * The problem is that, without this patch, JFFS2 believes it can write + * the data area and the out-of-band area separately. This is wrong for + * two reasons: + * + * 1) Our NFC distributes out-of-band bytes throughout the page, + * intermingled with the data, and covered by the same ECC. + * Thus, it's not possible to write the out-of-band bytes and + * data bytes separately. + * + * 2) Large page (MLC) Flash chips don't support partial page + * writes. You must write the entire page at a time. Thus, even + * if our NFC didn't force you to write out-of-band and data + * bytes together, it would *still* be a bad idea to do + * otherwise. + */ + + mtd->flags &= ~MTD_OOB_WRITEABLE; + + /* Set up geometry. */ + + mal_set_geometry(this); + + /* We use the reference implementation for bad block management. */ + + add_event("Exiting mil_scan_bbt", -1); + + return nand_scan_bbt(mtd, nand->badblock_pattern); + +} + +/** + * parse_bool_param() - Parses the value of a boolean parameter string. + * + * @s: The string to parse. + */ +static int parse_bool_param(const char *s) +{ + + if (!strcmp(s, "1") || !strcmp(s, "on") || + !strcmp(s, "yes") || !strcmp(s, "true")) { + return 1; + } else if (!strcmp(s, "0") || !strcmp(s, "off") || + !strcmp(s, "no") || !strcmp(s, "false")) { + return 0; + } else { + return -1; + } + +} + +/** + * set_module_enable() - Controls whether this driver is enabled. + * + * Note that this state can be controlled from the command line. Disabling this + * driver is sometimes useful for debugging. + * + * @s: The new value of the parameter. + * @kp: The owning kernel parameter. + */ +static int set_module_enable(const char *s, struct kernel_param *kp) +{ + + switch (parse_bool_param(s)) { + + case 1: + imx_nfc_module_enable = true; + break; + + case 0: + imx_nfc_module_enable = false; + break; + + default: + return -EINVAL; + break; + + } + + return 0; + +} + +/** + * get_module_enable() - Indicates whether this driver is enabled. + * + * @p: A pointer to a (small) buffer that will receive the response. + * @kp: The owning kernel parameter. + */ +static int get_module_enable(char *p, struct kernel_param *kp) +{ + p[0] = imx_nfc_module_enable ? '1' : '0'; + p[1] = 0; + return 1; +} + +#ifdef EVENT_REPORTING + +/** + * set_module_report_events() - Controls whether this driver reports events. + * + * @s: The new value of the parameter. + * @kp: The owning kernel parameter. + */ +static int set_module_report_events(const char *s, struct kernel_param *kp) +{ + + switch (parse_bool_param(s)) { + + case 1: + imx_nfc_module_report_events = true; + break; + + case 0: + imx_nfc_module_report_events = false; + reset_event_trace(); + break; + + default: + return -EINVAL; + break; + + } + + return 0; + +} + +/** + * get_module_report_events() - Indicates whether the driver reports events. + * + * @p: A pointer to a (small) buffer that will receive the response. + * @kp: The owning kernel parameter. + */ +static int get_module_report_events(char *p, struct kernel_param *kp) +{ + p[0] = imx_nfc_module_report_events ? '1' : '0'; + p[1] = 0; + return 1; +} + +/** + * set_module_dump_events() - Forces the driver to dump current events. + * + * @s: The new value of the parameter. + * @kp: The owning kernel parameter. + */ +static int set_module_dump_events(const char *s, struct kernel_param *kp) +{ + dump_event_trace(); + return 0; +} + +#endif /*EVENT_REPORTING*/ + +/** + * set_module_interleave_override() - Controls the interleave override. + * + * @s: The new value of the parameter. + * @kp: The owning kernel parameter. + */ +static int set_module_interleave_override(const char *s, + struct kernel_param *kp) +{ + + if (!strcmp(s, "-1")) + imx_nfc_module_interleave_override = NEVER; + else if (!strcmp(s, "0")) + imx_nfc_module_interleave_override = DRIVER_CHOICE; + else if (!strcmp(s, "1")) + imx_nfc_module_interleave_override = ALWAYS; + else + return -EINVAL; + + return 0; + +} + +/** + * get_module_interleave_override() - Indicates the interleave override state. + * + * @p: A pointer to a (small) buffer that will receive the response. + * @kp: The owning kernel parameter. + */ +static int get_module_interleave_override(char *p, struct kernel_param *kp) +{ + return sprintf(p, "%d", imx_nfc_module_interleave_override); +} + +/** + * set_force_bytewise_copy() - Controls forced bytewise copy from/to the NFC. + * + * @s: The new value of the parameter. + * @kp: The owning kernel parameter. + */ +static int set_module_force_bytewise_copy(const char *s, + struct kernel_param *kp) +{ + + switch (parse_bool_param(s)) { + + case 1: + imx_nfc_module_force_bytewise_copy = true; + break; + + case 0: + imx_nfc_module_force_bytewise_copy = false; + break; + + default: + return -EINVAL; + break; + + } + + return 0; + +} + +/** + * get_force_bytewise_copy() - Indicates whether bytewise copy is being forced. + * + * @p: A pointer to a (small) buffer that will receive the response. + * @kp: The owning kernel parameter. + */ +static int get_module_force_bytewise_copy(char *p, struct kernel_param *kp) +{ + p[0] = imx_nfc_module_force_bytewise_copy ? '1' : '0'; + p[1] = 0; + return 1; +} + +/* Module attributes that appear in sysfs. */ + +module_param_call(enable, set_module_enable, get_module_enable, 0, 0444); +MODULE_PARM_DESC(enable, "enables/disables probing"); + +#ifdef EVENT_REPORTING +module_param_call(report_events, + set_module_report_events, get_module_report_events, 0, 0644); +MODULE_PARM_DESC(report_events, "enables/disables event reporting"); + +module_param_call(dump_events, set_module_dump_events, 0, 0, 0644); +MODULE_PARM_DESC(dump_events, "forces current event dump"); +#endif + +module_param_call(interleave_override, set_module_interleave_override, + get_module_interleave_override, 0, 0444); +MODULE_PARM_DESC(interleave_override, "overrides interleaving choice"); + +module_param_call(force_bytewise_copy, set_module_force_bytewise_copy, + get_module_force_bytewise_copy, 0, 0644); +MODULE_PARM_DESC(force_bytewise_copy, "forces bytewise copy from/to NFC"); + +/** + * show_device_platform_info() - Shows the device's platform information. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_platform_info(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int o = 0; + unsigned int i; + void *buffer_base; + void *primary_base; + void *secondary_base; + unsigned int interrupt_number; + struct resource *r; + struct imx_nfc_data *this = dev_get_drvdata(dev); + struct platform_device *pdev = this->pdev; + struct imx_nfc_platform_data *pdata = this->pdata; + struct mtd_partition *partition; + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, + IMX_NFC_BUFFERS_ADDR_RES_NAME); + + buffer_base = (void *) r->start; + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, + IMX_NFC_PRIMARY_REGS_ADDR_RES_NAME); + + primary_base = (void *) r->start; + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, + IMX_NFC_SECONDARY_REGS_ADDR_RES_NAME); + + secondary_base = (void *) r->start; + + r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, + IMX_NFC_INTERRUPT_RES_NAME); + + interrupt_number = r->start; + + o += sprintf(buf, + "NFC Major Version : %u\n" + "NFC Minor Version : %u\n" + "Force CE : %s\n" + "Target Cycle in ns : %u\n" + "Clock Name : %s\n" + "Interleave : %s\n" + "Buffer Base : 0x%p\n" + "Primary Registers Base : 0x%p\n" + "Secondary Registers Base: 0x%p\n" + "Interrupt Number : %u\n" + , + pdata->nfc_major_version, + pdata->nfc_minor_version, + pdata->force_ce ? "Yes" : "No", + pdata->target_cycle_in_ns, + pdata->clock_name, + pdata->interleave ? "Yes" : "No", + buffer_base, + primary_base, + secondary_base, + interrupt_number + ); + + #ifdef CONFIG_MTD_PARTITIONS + + o += sprintf(buf + o, + "Partition Count : %u\n" + , + pdata->partition_count + ); + + /* Loop over partitions. */ + + for (i = 0; i < pdata->partition_count; i++) { + + partition = pdata->partitions + i; + + o += sprintf(buf+o, " [%d]\n", i); + o += sprintf(buf+o, " Name : %s\n", partition->name); + + switch (partition->offset) { + + case MTDPART_OFS_NXTBLK: + o += sprintf(buf+o, " Offset: " + "MTDPART_OFS_NXTBLK\n"); + break; + case MTDPART_OFS_APPEND: + o += sprintf(buf+o, " Offset: " + "MTDPART_OFS_APPEND\n"); + break; + default: + o += sprintf(buf+o, " Offset: %u (%u MiB)\n", + partition->offset, + partition->offset / (1024 * 1024)); + break; + + } + + if (partition->size == MTDPART_SIZ_FULL) { + o += sprintf(buf+o, " Size : " + "MTDPART_SIZ_FULL\n"); + } else { + o += sprintf(buf+o, " Size : %u (%u MiB)\n", + partition->size, + partition->size / (1024 * 1024)); + } + + } + + #endif + + return o; + +} + +/** + * show_device_physical_geometry() - Shows the physical Flash device geometry. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_physical_geometry(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + struct physical_geometry *physical = &this->physical_geometry; + + return sprintf(buf, + "Chip Count : %u\n" + "Chip Size in Bytes : %llu\n" + "Block Size in Bytes : %u\n" + "Page Data Size in Bytes: %u\n" + "Page OOB Size in Bytes : %u\n" + , + physical->chip_count, + physical->chip_size, + physical->block_size, + physical->page_data_size, + physical->page_oob_size + ); + +} + +/** + * show_device_nfc_info() - Shows the NFC-specific information. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_nfc_info(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long parent_clock_rate_in_hz; + unsigned long clock_rate_in_hz; + struct clk *parent_clock; + struct imx_nfc_data *this = dev_get_drvdata(dev); + struct nfc_hal *nfc = this->nfc; + + parent_clock = clk_get_parent(this->clock); + parent_clock_rate_in_hz = clk_get_rate(parent_clock); + clock_rate_in_hz = clk_get_rate(this->clock); + + return sprintf(buf, + "Major Version : %u\n" + "Minor Version : %u\n" + "Max Chip Count : %u\n" + "Max Buffer Count : %u\n" + "Spare Buffer Stride : %u\n" + "Has Secondary Registers : %s\n" + "Can Be Symmetric : %s\n" + "Exposes Ready/Busy : %s\n" + "Parent Clock Rate in Hz : %lu\n" + "Clock Rate in Hz : %lu\n" + "Symmetric Clock : %s\n" + , + nfc->major_version, + nfc->minor_version, + nfc->max_chip_count, + nfc->max_buffer_count, + nfc->spare_buf_stride, + nfc->has_secondary_regs ? "Yes" : "No", + nfc->can_be_symmetric ? "Yes" : "No", + nfc->is_ready ? "Yes" : "No", + parent_clock_rate_in_hz, + clock_rate_in_hz, + this->nfc->get_symmetric(this) ? "Yes" : "No" + ); + +} + +/** + * show_device_nfc_geometry() - Shows the NFC view of the device geometry. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_nfc_geometry(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + + return sprintf(buf, + "Page Data Size in Bytes : %u\n" + "Page OOB Size in Bytes : %u\n" + "ECC Algorithm : %s\n" + "ECC Strength : %u\n" + "Buffers in Use : %u\n" + "Spare Buffer Size in Use: %u\n" + "Spare Buffer Spillover : %u\n" + , + this->nfc_geometry->page_data_size, + this->nfc_geometry->page_oob_size, + this->nfc_geometry->ecc_algorithm, + this->nfc_geometry->ecc_strength, + this->nfc_geometry->buffer_count, + this->nfc_geometry->spare_buf_size, + this->nfc_geometry->spare_buf_spill + ); + +} + +/** + * show_device_logical_geometry() - Shows the logical device geometry. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_logical_geometry(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + struct logical_geometry *logical = &this->logical_geometry; + + return sprintf(buf, + "Chip Count : %u\n" + "Chip Size in Bytes : %u\n" + "Usable Size in Bytes : %u\n" + "Block Size in Bytes : %u\n" + "Page Data Size in Bytes: %u\n" + "Page OOB Size in Bytes : %u\n" + , + logical->chip_count, + logical->chip_size, + logical->usable_size, + logical->block_size, + logical->page_data_size, + logical->page_oob_size + ); + +} + +/** + * show_device_mtd_nand_info() - Shows the device's MTD NAND-specific info. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_mtd_nand_info(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int o = 0; + unsigned int i; + unsigned int j; + static const unsigned int columns = 8; + struct imx_nfc_data *this = dev_get_drvdata(dev); + struct nand_chip *nand = &this->nand; + + o += sprintf(buf + o, + "Options : 0x%08x\n" + "Chip Count : %u\n" + "Chip Size : %lu\n" + "Minimum Writable Size: %u\n" + "Page Shift : %u\n" + "Page Mask : 0x%x\n" + "Block Shift : %u\n" + "BBT Block Shift : %u\n" + "Chip Shift : %u\n" + "Block Mark Offset : %u\n" + "Cached Page Number : %d\n" + , + nand->options, + nand->numchips, + nand->chipsize, + nand->subpagesize, + nand->page_shift, + nand->pagemask, + nand->phys_erase_shift, + nand->bbt_erase_shift, + nand->chip_shift, + nand->badblockpos, + nand->pagebuf + ); + + o += sprintf(buf + o, + "ECC Byte Count : %u\n" + , + nand->ecc.layout->eccbytes + ); + + /* Loop over rows. */ + + for (i = 0; (i * columns) < nand->ecc.layout->eccbytes; i++) { + + /* Loop over columns within rows. */ + + for (j = 0; j < columns; j++) { + + if (((i * columns) + j) >= nand->ecc.layout->eccbytes) + break; + + o += sprintf(buf + o, " %3u", + nand->ecc.layout->eccpos[(i * columns) + j]); + + } + + o += sprintf(buf + o, "\n"); + + } + + o += sprintf(buf + o, + "OOB Available Bytes : %u\n" + , + nand->ecc.layout->oobavail + ); + + j = 0; + + for (i = 0; j < nand->ecc.layout->oobavail; i++) { + + j += nand->ecc.layout->oobfree[i].length; + + o += sprintf(buf + o, + " [%3u, %2u]\n" + , + nand->ecc.layout->oobfree[i].offset, + nand->ecc.layout->oobfree[i].length + ); + + } + + return o; + +} + +/** + * show_device_mtd_info() - Shows the device's MTD-specific information. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_mtd_info(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int o = 0; + unsigned int i; + unsigned int j; + static const unsigned int columns = 8; + struct imx_nfc_data *this = dev_get_drvdata(dev); + struct mtd_info *mtd = &this->mtd; + + o += sprintf(buf + o, + "Name : %s\n" + "Type : %u\n" + "Flags : 0x%08x\n" + "Size in Bytes : %u\n" + "Erase Region Count : %d\n" + "Erase Size in Bytes: %u\n" + "Write Size in Bytes: %u\n" + "OOB Size in Bytes : %u\n" + "Errors Corrected : %u\n" + "Failed Reads : %u\n" + "Bad Block Count : %u\n" + "BBT Block Count : %u\n" + , + mtd->name, + mtd->type, + mtd->flags, + mtd->size, + mtd->numeraseregions, + mtd->erasesize, + mtd->writesize, + mtd->oobsize, + mtd->ecc_stats.corrected, + mtd->ecc_stats.failed, + mtd->ecc_stats.badblocks, + mtd->ecc_stats.bbtblocks + ); + + o += sprintf(buf + o, + "ECC Byte Count : %u\n" + , + mtd->ecclayout->eccbytes + ); + + /* Loop over rows. */ + + for (i = 0; (i * columns) < mtd->ecclayout->eccbytes; i++) { + + /* Loop over columns within rows. */ + + for (j = 0; j < columns; j++) { + + if (((i * columns) + j) >= mtd->ecclayout->eccbytes) + break; + + o += sprintf(buf + o, " %3u", + mtd->ecclayout->eccpos[(i * columns) + j]); + + } + + o += sprintf(buf + o, "\n"); + + } + + o += sprintf(buf + o, + "OOB Available Bytes: %u\n" + , + mtd->ecclayout->oobavail + ); + + j = 0; + + for (i = 0; j < mtd->ecclayout->oobavail; i++) { + + j += mtd->ecclayout->oobfree[i].length; + + o += sprintf(buf + o, + " [%3u, %2u]\n" + , + mtd->ecclayout->oobfree[i].offset, + mtd->ecclayout->oobfree[i].length + ); + + } + + return o; + +} + +/** + * show_device_bbt_pages() - Shows the pages in which BBT's appear. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_bbt_pages(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int o = 0; + unsigned int i; + struct imx_nfc_data *this = dev_get_drvdata(dev); + struct nand_chip *nand = &this->nand; + + /* Loop over main BBT pages. */ + + if (nand->bbt_td) + for (i = 0; i < NAND_MAX_CHIPS; i++) + o += sprintf(buf + o, "%d: 0x%08x\n", + i, nand->bbt_td->pages[i]); + + /* Loop over mirror BBT pages. */ + + if (nand->bbt_md) + for (i = 0; i < NAND_MAX_CHIPS; i++) + o += sprintf(buf + o, "%d: 0x%08x\n", + i, nand->bbt_md->pages[i]); + + return o; + +} + +/** + * show_device_cycle_in_ns() - Shows the device's cycle in ns. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_cycle_in_ns(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + return sprintf(buf, "%u\n", get_cycle_in_ns(this)); +} + +/** + * store_device_cycle_in_ns() - Sets the device's cycle in ns. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_cycle_in_ns(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + int error; + unsigned long new_cycle_in_ns; + struct imx_nfc_data *this = dev_get_drvdata(dev); + + /* Look for nonsense. */ + + if (!size) + return -EINVAL; + + /* Try to understand the new cycle period. */ + + if (strict_strtoul(buf, 0, &new_cycle_in_ns)) + return -EINVAL; + + /* Try to implement the new cycle period. */ + + error = this->nfc->set_closest_cycle(this, new_cycle_in_ns); + + if (error) + return -EINVAL; + + /* Return success. */ + + return size; + +} + +/** + * show_device_interrupt_override() - Shows the device's interrupt override. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_interrupt_override(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + + switch (this->interrupt_override) { + + case NEVER: + return sprintf(buf, "-1\n"); + break; + + case DRIVER_CHOICE: + return sprintf(buf, "0\n"); + break; + + case ALWAYS: + return sprintf(buf, "1\n"); + break; + + default: + return sprintf(buf, "?\n"); + break; + + } + +} + +/** + * store_device_interrupt_override() - Sets the device's interrupt override. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_interrupt_override(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + + if (!strcmp(buf, "-1")) + this->interrupt_override = NEVER; + else if (!strcmp(buf, "0")) + this->interrupt_override = DRIVER_CHOICE; + else if (!strcmp(buf, "1")) + this->interrupt_override = ALWAYS; + else + return -EINVAL; + + return size; + +} + +/** + * show_device_auto_op_override() - Shows the device's automatic op override. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_auto_op_override(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + + switch (this->auto_op_override) { + + case NEVER: + return sprintf(buf, "-1\n"); + break; + + case DRIVER_CHOICE: + return sprintf(buf, "0\n"); + break; + + case ALWAYS: + return sprintf(buf, "1\n"); + break; + + default: + return sprintf(buf, "?\n"); + break; + + } + +} + +/** + * store_device_auto_op_override() - Sets the device's automatic op override. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_auto_op_override(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + + if (!strcmp(buf, "-1")) + this->auto_op_override = NEVER; + else if (!strcmp(buf, "0")) + this->auto_op_override = DRIVER_CHOICE; + else if (!strcmp(buf, "1")) + this->auto_op_override = ALWAYS; + else + return -EINVAL; + + return size; + +} + +/** + * show_device_inject_ecc_error() - Shows the device's error injection flag. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_inject_ecc_error(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", this->inject_ecc_error); + +} + +/** + * store_device_inject_ecc_error() - Sets the device's error injection flag. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_inject_ecc_error(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + unsigned long new_inject_ecc_error; + struct imx_nfc_data *this = dev_get_drvdata(dev); + + /* Look for nonsense. */ + + if (!size) + return -EINVAL; + + /* Try to understand the new cycle period. */ + + if (strict_strtol(buf, 0, &new_inject_ecc_error)) + return -EINVAL; + + /* Store the value. */ + + this->inject_ecc_error = new_inject_ecc_error; + + /* Return success. */ + + return size; + +} + +/** + * store_device_invalidate_page_cache() - Invalidates the device's page cache. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_invalidate_page_cache(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct imx_nfc_data *this = dev_get_drvdata(dev); + + /* Invalidate the page cache. */ + + this->nand.pagebuf = -1; + + /* Return success. */ + + return size; + +} + +/* Device attributes that appear in sysfs. */ + +static DEVICE_ATTR(platform_info , 0444, show_device_platform_info , 0); +static DEVICE_ATTR(physical_geometry, 0444, show_device_physical_geometry, 0); +static DEVICE_ATTR(nfc_info , 0444, show_device_nfc_info , 0); +static DEVICE_ATTR(nfc_geometry , 0444, show_device_nfc_geometry , 0); +static DEVICE_ATTR(logical_geometry , 0444, show_device_logical_geometry , 0); +static DEVICE_ATTR(mtd_nand_info , 0444, show_device_mtd_nand_info , 0); +static DEVICE_ATTR(mtd_info , 0444, show_device_mtd_info , 0); +static DEVICE_ATTR(bbt_pages , 0444, show_device_bbt_pages , 0); + +static DEVICE_ATTR(cycle_in_ns, 0644, + show_device_cycle_in_ns, store_device_cycle_in_ns); + +static DEVICE_ATTR(interrupt_override, 0644, + show_device_interrupt_override, store_device_interrupt_override); + +static DEVICE_ATTR(auto_op_override, 0644, + show_device_auto_op_override, store_device_auto_op_override); + +static DEVICE_ATTR(inject_ecc_error, 0644, + show_device_inject_ecc_error, store_device_inject_ecc_error); + +static DEVICE_ATTR(invalidate_page_cache, 0644, + 0, store_device_invalidate_page_cache); + +static struct device_attribute *device_attributes[] = { + &dev_attr_platform_info, + &dev_attr_physical_geometry, + &dev_attr_nfc_info, + &dev_attr_nfc_geometry, + &dev_attr_logical_geometry, + &dev_attr_mtd_nand_info, + &dev_attr_mtd_info, + &dev_attr_bbt_pages, + &dev_attr_cycle_in_ns, + &dev_attr_interrupt_override, + &dev_attr_auto_op_override, + &dev_attr_inject_ecc_error, + &dev_attr_invalidate_page_cache, +}; + +/** + * validate_the_platform() - Validates information about the platform. + * + * Note that this function doesn't validate the NFC version. That's done when + * the probing process attempts to configure for the specific hardware version. + * + * @pdev: A pointer to the platform device. + */ +static int validate_the_platform(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct imx_nfc_platform_data *pdata = pdev->dev.platform_data; + + /* Validate the clock name. */ + + if (!pdata->clock_name) { + dev_err(dev, "No clock name\n"); + return -ENXIO; + } + + /* Validate the partitions. */ + + if ((pdata->partitions && (!pdata->partition_count)) || + (!pdata->partitions && (pdata->partition_count))) { + dev_err(dev, "Bad partition data\n"); + return -ENXIO; + } + + /* Return success */ + + return 0; + +} + +/** + * set_up_the_nfc_hal() - Sets up for the specific NFC hardware HAL. + * + * @this: Per-device data. + */ +static int set_up_the_nfc_hal(struct imx_nfc_data *this) +{ + unsigned int i; + struct nfc_hal *p; + struct imx_nfc_platform_data *pdata = this->pdata; + + for (i = 0; i < ARRAY_SIZE(nfc_hals); i++) { + + p = nfc_hals[i]; + + /* + * Restrict to 3.2 until others are fully implemented. + * + * TODO: Remove this. + */ + + if ((p->major_version != 3) && (p->minor_version != 2)) + continue; + + if ((p->major_version == pdata->nfc_major_version) && + (p->minor_version == pdata->nfc_minor_version)) { + this->nfc = p; + return 0; + break; + } + + } + + dev_err(this->dev, "Unkown NFC version %d.%d\n", + pdata->nfc_major_version, pdata->nfc_minor_version); + + return !0; + +} + +/** + * acquire_resources() - Tries to acquire resources. + * + * @this: Per-device data. + */ +static int acquire_resources(struct imx_nfc_data *this) +{ + + int error = 0; + struct platform_device *pdev = this->pdev; + struct device *dev = this->dev; + struct imx_nfc_platform_data *pdata = this->pdata; + struct resource *r; + + /* Find the buffers and map them. */ + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, + IMX_NFC_BUFFERS_ADDR_RES_NAME); + + if (!r) { + dev_err(dev, "Can't get '%s'\n", IMX_NFC_BUFFERS_ADDR_RES_NAME); + error = -ENXIO; + goto exit_buffers; + } + + this->buffers = ioremap(r->start, r->end - r->start + 1); + + if (!this->buffers) { + dev_err(dev, "Can't remap buffers\n"); + error = -EIO; + goto exit_buffers; + } + + /* Find the primary registers and map them. */ + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, + IMX_NFC_PRIMARY_REGS_ADDR_RES_NAME); + + if (!r) { + dev_err(dev, "Can't get '%s'\n", + IMX_NFC_PRIMARY_REGS_ADDR_RES_NAME); + error = -ENXIO; + goto exit_primary_registers; + } + + this->primary_regs = ioremap(r->start, r->end - r->start + 1); + + if (!this->primary_regs) { + dev_err(dev, "Can't remap the primary registers\n"); + error = -EIO; + goto exit_primary_registers; + } + + /* Check for secondary registers. */ + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, + IMX_NFC_SECONDARY_REGS_ADDR_RES_NAME); + + if (r && !this->nfc->has_secondary_regs) { + + dev_err(dev, "Resource '%s' should not be present\n", + IMX_NFC_SECONDARY_REGS_ADDR_RES_NAME); + error = -ENXIO; + goto exit_secondary_registers; + + } + + if (this->nfc->has_secondary_regs) { + + if (!r) { + dev_err(dev, "Can't get '%s'\n", + IMX_NFC_SECONDARY_REGS_ADDR_RES_NAME); + error = -ENXIO; + goto exit_secondary_registers; + } + + this->secondary_regs = ioremap(r->start, r->end - r->start + 1); + + if (!this->secondary_regs) { + dev_err(dev, + "Can't remap the secondary registers\n"); + error = -EIO; + goto exit_secondary_registers; + } + + } + + /* Find out what our interrupt is and try to own it. */ + + r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, + IMX_NFC_INTERRUPT_RES_NAME); + + if (!r) { + dev_err(dev, "Can't get '%s'\n", IMX_NFC_INTERRUPT_RES_NAME); + error = -ENXIO; + goto exit_irq; + } + + this->interrupt = r->start; + + error = request_irq(this->interrupt, + nfc_util_isr, 0, this->dev->bus_id, this); + + if (error) { + dev_err(dev, "Can't own interrupt %d\n", this->interrupt); + goto exit_irq; + } + + /* Find out the name of our clock and try to own it. */ + + this->clock = clk_get(dev, pdata->clock_name); + + if (this->clock == ERR_PTR(-ENOENT)) { + dev_err(dev, "Can't get clock '%s'\n", pdata->clock_name); + error = -ENXIO; + goto exit_clock; + } + + /* Return success. */ + + return 0; + + /* Error return paths begin here. */ + +exit_clock: + free_irq(this->interrupt, this); +exit_irq: + if (this->secondary_regs) + iounmap(this->secondary_regs); +exit_secondary_registers: + iounmap(this->primary_regs); +exit_primary_registers: + iounmap(this->buffers); +exit_buffers: + return error; + +} + +/** + * release_resources() - Releases resources. + * + * @this: Per-device data. + */ +static void release_resources(struct imx_nfc_data *this) +{ + + /* Release our clock. */ + + clk_disable(this->clock); + clk_put(this->clock); + + /* Release our interrupt. */ + + free_irq(this->interrupt, this); + + /* Release mapped memory. */ + + iounmap(this->buffers); + iounmap(this->primary_regs); + if (this->secondary_regs) + iounmap(this->secondary_regs); + +} + +/** + * register_with_mtd() - Registers this medium with MTD. + * + * @this: Per-device data. + */ +static int register_with_mtd(struct imx_nfc_data *this) +{ + int error = 0; + struct mtd_info *mtd = &this->mtd; + struct nand_chip *nand = &this->nand; + struct device *dev = this->dev; + struct imx_nfc_platform_data *pdata = this->pdata; + + /* Link the MTD structures together, along with our own data. */ + + mtd->priv = nand; + nand->priv = this; + + /* Prepare the MTD structure. */ + + mtd->owner = THIS_MODULE; + + /* + * Signal Control Functions + */ + + nand->cmd_ctrl = mil_cmd_ctrl; + + /* + * Chip Control Functions + * + * Not all of our NFC hardware versions expose Ready/Busy signals. For + * versions that don't, the is_ready function pointer will be NULL. In + * those cases, we leave the dev_ready member unassigned, which will + * cause the HIL to use a reference implementation's algorithm to + * discover when the hardware is ready. + */ + + nand->select_chip = mil_select_chip; + nand->cmdfunc = mil_cmdfunc; + nand->waitfunc = mil_waitfunc; + + if (this->nfc->is_ready) + nand->dev_ready = mil_dev_ready; + + /* + * Low-level I/O Functions + */ + + nand->read_byte = mil_read_byte; + nand->read_word = mil_read_word; + nand->read_buf = mil_read_buf; + nand->write_buf = mil_write_buf; + nand->verify_buf = mil_verify_buf; + + /* + * ECC Control Functions + */ + + nand->ecc.hwctl = mil_ecc_hwctl; + nand->ecc.calculate = mil_ecc_calculate; + nand->ecc.correct = mil_ecc_correct; + + /* + * ECC-Aware I/O Functions + */ + + nand->ecc.read_page = mil_ecc_read_page; + nand->ecc.read_page_raw = mil_ecc_read_page_raw; + nand->ecc.write_page = mil_ecc_write_page; + nand->ecc.write_page_raw = mil_ecc_write_page_raw; + + /* + * High-level I/O Functions + */ + + nand->write_page = mil_write_page; + nand->ecc.read_oob = mil_ecc_read_oob; + nand->ecc.write_oob = mil_ecc_write_oob; + + /* + * Bad Block Marking Functions + * + * We want to use the reference block_bad and block_markbad + * implementations, so we don't assign those members. + */ + + nand->scan_bbt = mil_scan_bbt; + + /* + * Error Recovery Functions + * + * We don't fill in the errstat function pointer because it's optional + * and we don't have a need for it. + */ + + /* + * Device Attributes + * + * We don't fill in the chip_delay member because we don't have a need + * for it. + * + * We support only 8-bit Flash bus width. + */ + + /* + * ECC Attributes + * + * Members that aren't set here are configured by a version-specific + * set_geometry() function. + */ + + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.size = NFC_MAIN_BUF_SIZE; + nand->ecc.prepad = 0; + nand->ecc.postpad = 0; + + /* + * Bad Block Management Attributes + * + * We don't fill in the following attributes: + * + * badblockpos + * bbt + * badblock_pattern + * bbt_erase_shift + * + * These attributes aren't hardware-specific, and the HIL makes fine + * choices without our help. + */ + + nand->options |= NAND_USE_FLASH_BBT; + nand->bbt_td = &bbt_main_descriptor; + nand->bbt_md = &bbt_mirror_descriptor; + + /* + * Device Control + * + * We don't fill in the controller attribute. In principle, we could set + * up a structure to represent the controller. However, since it's + * vanishingly improbable that we'll have more than one medium behind + * the controller, it's not worth the effort. We let the HIL handle it. + */ + + /* + * Memory-mapped I/O + * + * We don't fill in the following attributes: + * + * IO_ADDR_R + * IO_ADDR_W + * + * None of these are necessary because we don't have a memory-mapped + * implementation. + */ + + /* + * Install a "fake" ECC layout. + * + * We'll be calling nand_scan() to do the final MTD setup. If we haven't + * already chosen an ECC layout, then nand_scan() will choose one based + * on the part geometry it discovers. Unfortunately, it doesn't make + * good choices. It would be best if we could install the correct ECC + * layout now, before we call nand_scan(). We can't do that because we + * don't know the medium geometry yet. Here, we install a "fake" ECC + * layout just to stop nand_scan() from trying to pick on for itself. + * Later, in imx_nfc_scan_bbt(), when we know the medium geometry, we'll + * install the correct choice. + * + * Of course, this tactic depends critically on nand_scan() not using + * the fake layout before we can install a good one. This is in fact the + * case. + */ + + nand->ecc.layout = &nfc_geometry_512_16_RS_ECC1.mtd_layout; + + /* + * Ask the NAND Flash system to scan for chips. + * + * This will fill in reference implementations for all the members of + * the MTD structures that we didn't set, and will make the medium fully + * usable. + */ + + error = nand_scan(mtd, this->nfc->max_chip_count); + + if (error) { + dev_err(dev, "Chip scan failed\n"); + error = -ENXIO; + goto exit_scan; + } + + /* Register the MTD that represents the entire medium. */ + + mtd->name = "NAND Flash Medium"; + + add_mtd_device(mtd); + + /* Check if we're doing partitions and register MTD's accordingly. */ + + #ifdef CONFIG_MTD_PARTITIONS + + /* + * Look for partition information. If we find some, install + * them. Otherwise, use the partitions handed to us by the + * platform. + */ + + this->partition_count = + parse_mtd_partitions(mtd, partition_source_types, + &this->partitions, 0); + + if ((this->partition_count <= 0) && (pdata->partitions)) { + this->partition_count = pdata->partition_count; + this->partitions = pdata->partitions; + } + + if (this->partitions) + add_mtd_partitions(mtd, this->partitions, + this->partition_count); + + #endif + + /* Return success. */ + + return 0; + + /* Error return paths begin here. */ + +exit_scan: + return error; + +} + +/** + * unregister_with_mtd() - Unregisters this medium with MTD. + * + * @this: Per-device data. + */ +static void unregister_with_mtd(struct imx_nfc_data *this) +{ + + /* Get MTD to let go. */ + + nand_release(&this->mtd); + +} + +/** + * manage_sysfs_files() - Creates/removes sysfs files for this device. + * + * @this: Per-device data. + */ +static void manage_sysfs_files(struct imx_nfc_data *this, int create) +{ + int error; + unsigned int i; + struct device_attribute **attr; + + for (i = 0, attr = device_attributes; + i < ARRAY_SIZE(device_attributes); i++, attr++) { + + if (create) { + error = device_create_file(this->dev, *attr); + if (error) { + while (--attr >= device_attributes) + device_remove_file(this->dev, *attr); + return; + } + } else { + device_remove_file(this->dev, *attr); + } + + } + +} + +/** + * imx_nfc_probe() - Probes for a device and, if possible, takes ownership. + * + * @pdev: A pointer to the platform device. + */ +static int imx_nfc_probe(struct platform_device *pdev) +{ + int error = 0; + char *symmetric_clock; + struct clk *parent_clock; + unsigned long parent_clock_rate_in_hz; + unsigned long parent_clock_rate_in_mhz; + unsigned long nfc_clock_rate_in_hz; + unsigned long nfc_clock_rate_in_mhz; + unsigned long clock_divisor; + unsigned long cycle_in_ns; + struct device *dev = &pdev->dev; + struct imx_nfc_platform_data *pdata = pdev->dev.platform_data; + struct imx_nfc_data *this = 0; + + /* Say hello. */ + + dev_info(dev, "Probing...\n"); + + /* Check if we're enabled. */ + + if (!imx_nfc_module_enable) { + dev_info(dev, "Disabled\n"); + return -ENXIO; + } + + /* Validate the platform device data. */ + + error = validate_the_platform(pdev); + + if (error) + goto exit_validate_platform; + + /* Allocate memory for the per-device data. */ + + this = kzalloc(sizeof(*this), GFP_KERNEL); + + if (!this) { + dev_err(dev, "Failed to allocate per-device memory\n"); + error = -ENOMEM; + goto exit_allocate_this; + } + + /* Link our per-device data to the owning device. */ + + platform_set_drvdata(pdev, this); + + /* Fill in the convenience pointers in our per-device data. */ + + this->pdev = pdev; + this->dev = &pdev->dev; + this->pdata = pdata; + + /* Initialize the interrupt service pathway. */ + + init_completion(&this->done); + + /* Set up the NFC HAL. */ + + error = set_up_the_nfc_hal(this); + + if (error) + goto exit_set_up_nfc_hal; + + /* Attempt to acquire the resources we need. */ + + error = acquire_resources(this); + + if (error) + goto exit_acquire_resources; + + /* Initialize the NFC HAL. */ + + if (this->nfc->init(this)) { + error = -ENXIO; + goto exit_nfc_init; + } + + /* Tell the platform we're bringing this device up. */ + + if (pdata->init) + error = pdata->init(); + + if (error) + goto exit_platform_init; + + /* Report. */ + + parent_clock = clk_get_parent(this->clock); + parent_clock_rate_in_hz = clk_get_rate(parent_clock); + parent_clock_rate_in_mhz = parent_clock_rate_in_hz / 1000000; + nfc_clock_rate_in_hz = clk_get_rate(this->clock); + nfc_clock_rate_in_mhz = nfc_clock_rate_in_hz / 1000000; + + clock_divisor = parent_clock_rate_in_hz / nfc_clock_rate_in_hz; + symmetric_clock = this->nfc->get_symmetric(this) ? "Yes" : "No"; + cycle_in_ns = get_cycle_in_ns(this); + + dev_dbg(dev, "-------------\n"); + dev_dbg(dev, "Configuration\n"); + dev_dbg(dev, "-------------\n"); + dev_dbg(dev, "NFC Version : %d.%d\n" , this->nfc->major_version, + this->nfc->minor_version); + dev_dbg(dev, "Buffers : 0x%p\n" , this->buffers); + dev_dbg(dev, "Primary Regs : 0x%p\n" , this->primary_regs); + dev_dbg(dev, "Secondary Regs : 0x%p\n" , this->secondary_regs); + dev_dbg(dev, "Interrupt : %u\n" , this->interrupt); + dev_dbg(dev, "Clock Name : %s\n" , pdata->clock_name); + dev_dbg(dev, "Parent Clock Rate: %lu Hz (%lu MHz)\n", + parent_clock_rate_in_hz, + parent_clock_rate_in_mhz); + dev_dbg(dev, "Clock Divisor : %lu\n", clock_divisor); + dev_dbg(dev, "NFC Clock Rate : %lu Hz (%lu MHz)\n", + nfc_clock_rate_in_hz, + nfc_clock_rate_in_mhz); + dev_dbg(dev, "Symmetric Clock : %s\n" , symmetric_clock); + dev_dbg(dev, "Actual Cycle : %lu ns\n" , cycle_in_ns); + dev_dbg(dev, "Target Cycle : %u ns\n" , pdata->target_cycle_in_ns); + + /* Initialize the Medium Abstraction Layer. */ + + mal_init(this); + + /* Initialize the MTD Interface Layer. */ + + mil_init(this); + + /* Register this medium with MTD. */ + + error = register_with_mtd(this); + + if (error) + goto exit_mtd_registration; + + /* Create sysfs entries for this device. */ + + manage_sysfs_files(this, true); + + /* Return success. */ + + return 0; + + /* Error return paths begin here. */ + +exit_mtd_registration: + if (pdata->exit) + pdata->exit(); +exit_platform_init: + this->nfc->exit(this); +exit_nfc_init: +exit_acquire_resources: +exit_set_up_nfc_hal: + platform_set_drvdata(pdev, NULL); + kfree(this); +exit_allocate_this: +exit_validate_platform: + return error; + +} + +/** + * imx_nfc_remove() - Dissociates this driver from the given device. + * + * @pdev: A pointer to the device. + */ +static int __exit imx_nfc_remove(struct platform_device *pdev) +{ + struct imx_nfc_data *this = platform_get_drvdata(pdev); + + /* Remove sysfs entries for this device. */ + + manage_sysfs_files(this, false); + + /* Unregister with the NAND Flash MTD system. */ + + unregister_with_mtd(this); + + /* Tell the platform we're shutting down this device. */ + + if (this->pdata->exit) + this->pdata->exit(); + + /* Shut down the NFC. */ + + this->nfc->exit(this); + + /* Release our resources. */ + + release_resources(this); + + /* Unlink our per-device data from the platform device. */ + + platform_set_drvdata(pdev, NULL); + + /* Free our per-device data. */ + + kfree(this); + + /* Return success. */ + + return 0; +} + +#ifdef CONFIG_PM + +/** + * suspend() - Puts the NFC in a low power state. + * + * Refer to Documentation/driver-model/driver.txt for more information. + * + * @pdev: A pointer to the device. + * @state: The new power state. + */ + +static int imx_nfc_suspend(struct platform_device *pdev, pm_message_t state) +{ + int error = 0; + struct imx_nfc_data *this = platform_get_drvdata(pdev); + struct mtd_info *mtd = &this->mtd; + struct device *dev = &this->pdev->dev; + + dev_dbg(dev, "Suspending...\n"); + + /* Suspend MTD's use of this device. */ + + error = mtd->suspend(mtd); + + /* Suspend the actual hardware. */ + + clk_disable(this->clock); + + return error; + +} + +/** + * resume() - Brings the NFC back from a low power state. + * + * Refer to Documentation/driver-model/driver.txt for more information. + * + * @pdev: A pointer to the device. + */ +static int imx_nfc_resume(struct platform_device *pdev) +{ + struct imx_nfc_data *this = platform_get_drvdata(pdev); + struct mtd_info *mtd = &this->mtd; + struct device *dev = &this->pdev->dev; + + dev_dbg(dev, "Resuming...\n"); + + /* Resume MTD's use of this device. */ + + mtd->resume(mtd); + + return 0; + +} + +#else + +#define suspend NULL +#define resume NULL + +#endif /* CONFIG_PM */ + +/* + * This structure represents this driver to the platform management system. + */ +static struct platform_driver imx_nfc_driver = { + .driver = { + .name = IMX_NFC_DRIVER_NAME, + }, + .probe = imx_nfc_probe, + .remove = __exit_p(imx_nfc_remove), + .suspend = imx_nfc_suspend, + .resume = imx_nfc_resume, +}; + +/** + * imx_nfc_init() - Initializes this module. + */ +static int __init imx_nfc_init(void) +{ + + pr_info("i.MX NFC driver %s\n", DRIVER_VERSION); + + /* Register this driver with the platform management system. */ + + if (platform_driver_register(&imx_nfc_driver) != 0) { + pr_err("i.MX NFC driver registration failed\n"); + return -ENODEV; + } + + return 0; + +} + +/** + * imx_nfc_exit() - Deactivates this module. + */ +static void __exit imx_nfc_exit(void) +{ + pr_debug("i.MX NFC driver exiting...\n"); + platform_driver_unregister(&imx_nfc_driver); +} + +module_init(imx_nfc_init); +module_exit(imx_nfc_exit); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("i.MX NAND Flash Controller Driver"); +MODULE_LICENSE("GPL"); |