diff options
Diffstat (limited to 'arch/arm/mach-stmp3xxx/mmc.c')
| -rw-r--r-- | arch/arm/mach-stmp3xxx/mmc.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/arch/arm/mach-stmp3xxx/mmc.c b/arch/arm/mach-stmp3xxx/mmc.c new file mode 100644 index 000000000000..d90d680908ce --- /dev/null +++ b/arch/arm/mach-stmp3xxx/mmc.c @@ -0,0 +1,161 @@ +/* + * 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/stmp3xxx.h> +#include <mach/regs-ssp.h> +#include "common.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), +}; + +static int stmp3xxxmmc_get_wp(void) +{ + if (mmc_wp_supported) + return gpio_get_value(MMC_WP); + + return 0; +} + +static 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; +} + +static 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"); +} + +static void stmp3xxxmmc_cmd_pullup_ssp1(int enable) +{ + stmp3xxx_pin_pullup(PINID_SSP1_CMD, enable, "mmc"); +} + +static 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 */ + HW_SSP_TIMING_WR(BF_SSP_TIMING_CLOCK_DIVIDE(2) | + BF_SSP_TIMING_TIMEOUT(0xFFFF)); + + 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; +} + +static struct stmp3xxxmmc_platform_data mmc_data = { + .hw_init = stmp3xxxmmc_hw_init_ssp1, + .hw_release = stmp3xxxmmc_hw_release_ssp1, + .get_wp = stmp3xxxmmc_get_wp, + .cmd_pullup = stmp3xxxmmc_cmd_pullup_ssp1, + .setclock = stmp3xxxmmc_setclock_ssp1, + .read_uA = 50000, + .write_uA = 70000, +}; + +void stmp3xxx_set_mmc_data(struct device *dev) +{ + dev->platform_data = &mmc_data; +} +EXPORT_SYMBOL(stmp3xxx_set_mmc_data); |