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/*
* Freescale STMP37XX/STMP378X MMC pin multiplexing
*
* Embedded Alley Solutions, Inc <source@embeddedalley.com>
*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright 2008 Embedded Alley Solutions, 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/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <mach/pinmux.h>
#include <mach/stmp3xxx.h>
#include <mach/platform.h>
#include <mach/mmc.h>
#include <mach/regs-ssp.h>
#if defined(CONFIG_MACH_STMP378X)
#define MMC_POWER PINID_PWM3
#define MMC_WP PINID_PWM4
#elif defined(CONFIG_MACH_STMP37XX)
#define MMC_POWER PINID_PWM3
#define MMC_WP PINID_PWM4
#else
#define MMC_POWER PINID_NO_PIN
#define MMC_WP PINID_NO_PIN
#endif
static int mmc_drive_power;
static int mmc_wp_supported;
static struct pin_desc mmc_pins_desc[] = {
{ PINID_SSP1_DATA0, PIN_FUN1, PIN_8MA, PIN_3_3V, 1 },
{ PINID_SSP1_DATA1, PIN_FUN1, PIN_8MA, PIN_3_3V, 1 },
{ PINID_SSP1_DATA2, PIN_FUN1, PIN_8MA, PIN_3_3V, 1 },
{ PINID_SSP1_DATA3, PIN_FUN1, PIN_8MA, PIN_3_3V, 1 },
{ PINID_SSP1_CMD, PIN_FUN1, PIN_8MA, PIN_3_3V, 1 },
{ PINID_SSP1_SCK, PIN_FUN1, PIN_8MA, PIN_3_3V, 0 },
{ PINID_SSP1_DETECT, PIN_FUN1, PIN_8MA, PIN_3_3V, 0 },
};
static struct pin_group mmc_pins = {
.pins = mmc_pins_desc,
.nr_pins = ARRAY_SIZE(mmc_pins_desc),
};
int stmp3xxxmmc_get_wp(void)
{
if (mmc_wp_supported)
return gpio_get_value(MMC_WP);
return 0;
}
int stmp3xxxmmc_hw_init_ssp1(void)
{
int ret;
mmc_drive_power = stmp3xxx_valid_pin(MMC_POWER);
mmc_wp_supported = stmp3xxx_valid_pin(MMC_WP);
ret = stmp3xxx_request_pin_group(&mmc_pins, "mmc");
if (ret)
goto out;
if (mmc_wp_supported) {
/* Configure write protect GPIO pin */
ret = gpio_request(MMC_WP, "mmc wp");
if (ret)
goto out_wp;
gpio_set_value(MMC_WP, 0);
gpio_direction_input(MMC_WP);
}
if (mmc_drive_power) {
/* Configure POWER pin as gpio to drive power to MMC slot */
ret = gpio_request(MMC_POWER, "mmc power");
if (ret)
goto out_power;
gpio_direction_output(MMC_POWER, 0);
mdelay(100);
}
return 0;
out_power:
if (mmc_wp_supported)
gpio_free(MMC_WP);
out_wp:
stmp3xxx_release_pin_group(&mmc_pins, "mmc");
out:
return ret;
}
void stmp3xxxmmc_hw_release_ssp1(void)
{
if (mmc_drive_power)
gpio_free(MMC_POWER);
if (mmc_wp_supported)
gpio_free(MMC_WP);
stmp3xxx_release_pin_group(&mmc_pins, "mmc");
}
void stmp3xxxmmc_cmd_pullup_ssp1(int enable)
{
stmp3xxx_pin_pullup(PINID_SSP1_CMD, enable, "mmc");
}
unsigned long stmp3xxxmmc_setclock_ssp1(unsigned long hz)
{
struct clk *ssp = clk_get(NULL, "ssp"), *parent;
char *p;
long r;
/* using SSP1, no timeout, clock rate 1 */
__raw_writel(BF(2, SSP_TIMING_CLOCK_DIVIDE) |
BF(0xFFFF, SSP_TIMING_TIMEOUT),
REGS_SSP1_BASE + HW_SSP_TIMING);
if (hz > 1000000)
p = "io";
else
p = "osc_24M";
parent = clk_get(NULL, p);
clk_set_parent(ssp, parent);
r = clk_set_rate(ssp, 2 * hz / 1000);
clk_put(parent);
clk_put(ssp);
return hz;
}
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