diff options
Diffstat (limited to 'arch/arm/mach-imx/cpuidle-imx6sll.c')
| -rw-r--r-- | arch/arm/mach-imx/cpuidle-imx6sll.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/cpuidle-imx6sll.c b/arch/arm/mach-imx/cpuidle-imx6sll.c new file mode 100644 index 000000000000..bb8678ff56f0 --- /dev/null +++ b/arch/arm/mach-imx/cpuidle-imx6sll.c @@ -0,0 +1,277 @@ +/* + * Copyright (C) 2016 Freescale Semiconductor, Inc. + * Copyright 2017 NXP. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/busfreq-imx.h> +#include <linux/cpuidle.h> +#include <linux/cpu_pm.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/psci.h> +#include <linux/regulator/consumer.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <asm/cpuidle.h> +#include <asm/fncpy.h> +#include <asm/proc-fns.h> +#include <asm/suspend.h> + +#include <uapi/linux/psci.h> + +#include "common.h" +#include "cpuidle.h" +#include "hardware.h" + +#define MAX_MMDC_IO_NUM 14 + +#define PMU_LOW_PWR_CTRL 0x270 +#define XTALOSC24M_OSC_CONFIG0 0x2a0 +#define XTALOSC24M_OSC_CONFIG1 0x2b0 +#define XTALOSC24M_OSC_CONFIG2 0x2c0 +#define XTALOSC24M_OSC_CONFIG0_RC_OSC_PROG_CUR_SHIFT 24 +#define XTALOSC24M_OSC_CONFIG0_HYST_MINUS_MASK 0xf +#define XTALOSC24M_OSC_CONFIG0_HYST_MINUS_SHIFT 16 +#define XTALOSC24M_OSC_CONFIG0_HYST_PLUS_MASK 0xf +#define XTALOSC24M_OSC_CONFIG0_HYST_PLUS_SHIFT 12 +#define XTALOSC24M_OSC_CONFIG0_RC_OSC_PROG_SHIFT 4 +#define XTALOSC24M_OSC_CONFIG0_ENABLE_SHIFT 1 +#define XTALOSC24M_OSC_CONFIG0_START_SHIFT 0 +#define XTALOSC24M_OSC_CONFIG1_COUNT_RC_CUR_SHIFT 20 +#define XTALOSC24M_OSC_CONFIG1_COUNT_RC_TRG_SHIFT 0 +#define XTALOSC24M_OSC_CONFIG2_COUNT_1M_TRG_MASK 0xfff +#define XTALOSC24M_OSC_CONFIG2_COUNT_1M_TRG_SHIFT 0 + +extern unsigned long iram_tlb_phys_addr; +static void __iomem *wfi_iram_base; + +#ifdef CONFIG_CPU_FREQ +static void __iomem *wfi_iram_base_phys; +extern unsigned long mx6sll_lpm_wfi_start asm("mx6sll_lpm_wfi_start"); +extern unsigned long mx6sll_lpm_wfi_end asm("mx6sll_lpm_wfi_end"); +#endif + +struct imx6_pm_base { + phys_addr_t pbase; + void __iomem *vbase; +}; + +struct imx6_cpuidle_pm_info { + phys_addr_t pbase; /* The physical address of pm_info. */ + phys_addr_t resume_addr; /* The physical resume address for asm code */ + u32 pm_info_size; /* Size of pm_info. */ + u32 ttbr; + struct imx6_pm_base mmdc_base; + struct imx6_pm_base iomuxc_base; + struct imx6_pm_base ccm_base; + struct imx6_pm_base gpc_base; + struct imx6_pm_base anatop_base; + struct imx6_pm_base src_base; + struct imx6_pm_base l2_base; + u32 saved_diagnostic; /* To save disagnostic register */ + u32 mmdc_io_num; /* Number of MMDC IOs which need saved/restored. */ + u32 mmdc_io_val[MAX_MMDC_IO_NUM][2]; /* To save offset and value */ +} __aligned(8); + +static const u32 imx6sll_mmdc_io_offset[] __initconst = { + 0x294, 0x298, 0x29c, 0x2a0, /* DQM0, DQM1, RAS, CAS */ + 0x544, 0x54c, 0x554, 0x558, /* GPR_B0DS ~ GPR_B3DS */ + 0x530, 0x540, 0x2ac, 0x52c, /* MODE_CTL, MODE, SDCLK0, GPR_ADDS */ + 0x2a4, 0x2a8, /* SDCKE0, SDCKE1 */ +}; + +static void (*imx6sll_wfi_in_iram_fn)(void __iomem *iram_vbase); + +#define MX6SLL_POWERDWN_IDLE_PARAM \ + ((1 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \ + (1 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \ + (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT)) + +static int imx6sll_idle_finish(unsigned long val) +{ + if (psci_ops.cpu_suspend) + psci_ops.cpu_suspend(MX6SLL_POWERDWN_IDLE_PARAM, + __pa(cpu_resume)); + else + imx6sll_wfi_in_iram_fn(wfi_iram_base); + + return 0; +} + +static int imx6sll_enter_wait(struct cpuidle_device *dev, + struct cpuidle_driver *drv, int index) +{ + int mode = get_bus_freq_mode(); + + imx6_set_lpm(WAIT_UNCLOCKED); + if ((index == 1) || ((mode != BUS_FREQ_LOW) && index == 2)) { + index = 1; + cpu_do_idle(); + } else { + imx_gpc_switch_pupscr_clk(true); + /* Need to notify there is a cpu pm operation. */ + cpu_pm_enter(); + cpu_cluster_pm_enter(); + + cpu_suspend(0, imx6sll_idle_finish); + + cpu_cluster_pm_exit(); + cpu_pm_exit(); + imx6_enable_rbc(false); + + imx_gpc_switch_pupscr_clk(false); + } + + imx6_set_lpm(WAIT_CLOCKED); + + return index; +} + +static struct cpuidle_driver imx6sll_cpuidle_driver = { + .name = "imx6sll_cpuidle", + .owner = THIS_MODULE, + .states = { + /* WFI */ + ARM_CPUIDLE_WFI_STATE, + /* WAIT */ + { + .exit_latency = 50, + .target_residency = 75, + .enter = imx6sll_enter_wait, + .name = "WAIT", + .desc = "Clock off", + }, + /* LOW POWER IDLE */ + { + /* + * RBC 130us + ARM gating 43us + RBC clear 65us + * + PLL2 relock 450us and some margin, here set + * it to 700us. + */ + .exit_latency = 700, + .target_residency = 1000, + .enter = imx6sll_enter_wait, + .name = "LOW-POWER-IDLE", + .desc = "ARM power off", + } + }, + .state_count = 3, + .safe_state_index = 0, +}; + +int __init imx6sll_cpuidle_init(void) +{ + void __iomem *anatop_base = (void __iomem *)IMX_IO_P2V(MX6Q_ANATOP_BASE_ADDR); + u32 val; +#ifdef CONFIG_CPU_FREQ + struct imx6_cpuidle_pm_info *cpuidle_pm_info; + int i; + const u32 *mmdc_offset_array; + u32 wfi_code_size; + + wfi_iram_base_phys = (void *)(iram_tlb_phys_addr + MX6_CPUIDLE_IRAM_ADDR_OFFSET); + + /* Make sure wfi_iram_base is 8 byte aligned. */ + if ((uintptr_t)(wfi_iram_base_phys) & (FNCPY_ALIGN - 1)) + wfi_iram_base_phys += FNCPY_ALIGN - ((uintptr_t)wfi_iram_base_phys % (FNCPY_ALIGN)); + + wfi_iram_base = (void *)IMX_IO_P2V((unsigned long) wfi_iram_base_phys); + + cpuidle_pm_info = wfi_iram_base; + cpuidle_pm_info->pbase = (phys_addr_t) wfi_iram_base_phys; + cpuidle_pm_info->pm_info_size = sizeof(*cpuidle_pm_info); + cpuidle_pm_info->resume_addr = virt_to_phys(v7_cpu_resume); + cpuidle_pm_info->mmdc_io_num = ARRAY_SIZE(imx6sll_mmdc_io_offset); + mmdc_offset_array = imx6sll_mmdc_io_offset; + + cpuidle_pm_info->mmdc_base.pbase = MX6Q_MMDC_P0_BASE_ADDR; + cpuidle_pm_info->mmdc_base.vbase = (void __iomem *)IMX_IO_P2V(MX6Q_MMDC_P0_BASE_ADDR); + + cpuidle_pm_info->ccm_base.pbase = MX6Q_CCM_BASE_ADDR; + cpuidle_pm_info->ccm_base.vbase = (void __iomem *)IMX_IO_P2V(MX6Q_CCM_BASE_ADDR); + + cpuidle_pm_info->anatop_base.pbase = MX6Q_ANATOP_BASE_ADDR; + cpuidle_pm_info->anatop_base.vbase = (void __iomem *)IMX_IO_P2V(MX6Q_ANATOP_BASE_ADDR); + + cpuidle_pm_info->gpc_base.pbase = MX6Q_GPC_BASE_ADDR; + cpuidle_pm_info->gpc_base.vbase = (void __iomem *)IMX_IO_P2V(MX6Q_GPC_BASE_ADDR); + + cpuidle_pm_info->iomuxc_base.pbase = MX6Q_IOMUXC_BASE_ADDR; + cpuidle_pm_info->iomuxc_base.vbase = (void __iomem *)IMX_IO_P2V(MX6Q_IOMUXC_BASE_ADDR); + + cpuidle_pm_info->src_base.pbase = MX6Q_SRC_BASE_ADDR; + cpuidle_pm_info->src_base.vbase = (void __iomem *)IMX_IO_P2V(MX6Q_SRC_BASE_ADDR); + + cpuidle_pm_info->l2_base.pbase = MX6Q_L2_BASE_ADDR; + cpuidle_pm_info->l2_base.vbase = (void __iomem *)IMX_IO_P2V(MX6Q_L2_BASE_ADDR); + + /* Only save mmdc io offset, settings will be saved in asm code */ + for (i = 0; i < cpuidle_pm_info->mmdc_io_num; i++) + cpuidle_pm_info->mmdc_io_val[i][0] = mmdc_offset_array[i]; + + wfi_code_size = (&mx6sll_lpm_wfi_end -&mx6sll_lpm_wfi_start) *4; + + imx6sll_wfi_in_iram_fn = (void *)fncpy(wfi_iram_base + sizeof(*cpuidle_pm_info), + &imx6sll_low_power_idle, wfi_code_size); +#endif + + imx6_set_int_mem_clk_lpm(true); + + /* + * enable RC-OSC here, as it needs at least 4ms for RC-OSC to + * be stable, low power idle flow can NOT endure this big + * latency, so we make RC-OSC self-tuning enabled here. + */ + val = readl_relaxed(anatop_base + PMU_LOW_PWR_CTRL); + val |= 0x1; + writel_relaxed(val, anatop_base + PMU_LOW_PWR_CTRL); + /* + * config RC-OSC freq + * tune_enable = 1;tune_start = 1;hyst_plus = 0;hyst_minus = 0; + * osc_prog = 0xa7; + */ + writel_relaxed( + 0x4 << XTALOSC24M_OSC_CONFIG0_RC_OSC_PROG_CUR_SHIFT | + 0xa7 << XTALOSC24M_OSC_CONFIG0_RC_OSC_PROG_SHIFT | + 0x1 << XTALOSC24M_OSC_CONFIG0_ENABLE_SHIFT | + 0x1 << XTALOSC24M_OSC_CONFIG0_START_SHIFT, + anatop_base + XTALOSC24M_OSC_CONFIG0); + /* set count_trg = 0x2dc */ + writel_relaxed( + 0x40 << XTALOSC24M_OSC_CONFIG1_COUNT_RC_CUR_SHIFT | + 0x2dc << XTALOSC24M_OSC_CONFIG1_COUNT_RC_TRG_SHIFT, + anatop_base + XTALOSC24M_OSC_CONFIG1); + /* wait 4ms according to hardware design */ + msleep(4); + /* + * now add some hysteresis, hyst_plus=3, hyst_minus=3 + * (the minimum hysteresis that looks good is 2) + */ + val = readl_relaxed(anatop_base + XTALOSC24M_OSC_CONFIG0); + val &= ~((XTALOSC24M_OSC_CONFIG0_HYST_MINUS_MASK << + XTALOSC24M_OSC_CONFIG0_HYST_MINUS_SHIFT) | + (XTALOSC24M_OSC_CONFIG0_HYST_PLUS_MASK << + XTALOSC24M_OSC_CONFIG0_HYST_PLUS_SHIFT)); + val |= (0x3 << XTALOSC24M_OSC_CONFIG0_HYST_MINUS_SHIFT) | + (0x3 << XTALOSC24M_OSC_CONFIG0_HYST_PLUS_SHIFT); + writel_relaxed(val, anatop_base + XTALOSC24M_OSC_CONFIG0); + /* set the count_1m_trg = 0x2d7 */ + val = readl_relaxed(anatop_base + XTALOSC24M_OSC_CONFIG2); + val &= ~(XTALOSC24M_OSC_CONFIG2_COUNT_1M_TRG_MASK << + XTALOSC24M_OSC_CONFIG2_COUNT_1M_TRG_SHIFT); + val |= 0x2d7 << XTALOSC24M_OSC_CONFIG2_COUNT_1M_TRG_SHIFT; + writel_relaxed(val, anatop_base + XTALOSC24M_OSC_CONFIG2); + /* + * hardware design require to write XTALOSC24M_OSC_CONFIG0 or + * XTALOSC24M_OSC_CONFIG1 to + * make XTALOSC24M_OSC_CONFIG2 write work + */ + val = readl_relaxed(anatop_base + XTALOSC24M_OSC_CONFIG1); + + return cpuidle_register(&imx6sll_cpuidle_driver, NULL); +} |