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board-trout-mmc.c

/* linux/arch/arm/mach-msm/board-trout-mmc.c
** Author: Brian Swetland <swetland@google.com>
*/

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/err.h>
#include <linux/debugfs.h>

#include <asm/gpio.h>
#include <asm/io.h>

#include <mach/vreg.h>

#include <mach/mmc.h>

#include "devices.h"

#include "board-trout.h"

#include "proc_comm.h"

#define DEBUG_SDSLOT_VDD 1

/* ---- COMMON ---- */
static void config_gpio_table(uint32_t *table, int len)
{
      int n;
      unsigned id;
      for(n = 0; n < len; n++) {
            id = table[n];
            msm_proc_comm(PCOM_RPC_GPIO_TLMM_CONFIG_EX, &id, 0);
      }
}

/* ---- SDCARD ---- */

static uint32_t sdcard_on_gpio_table[] = {
      PCOM_GPIO_CFG(62, 2, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_8MA), /* CLK */
      PCOM_GPIO_CFG(63, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_8MA), /* CMD */
      PCOM_GPIO_CFG(64, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_8MA), /* DAT3 */
      PCOM_GPIO_CFG(65, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_8MA), /* DAT2 */
      PCOM_GPIO_CFG(66, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_4MA), /* DAT1 */
      PCOM_GPIO_CFG(67, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_4MA), /* DAT0 */
};

static uint32_t sdcard_off_gpio_table[] = {
      PCOM_GPIO_CFG(62, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* CLK */
      PCOM_GPIO_CFG(63, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* CMD */
      PCOM_GPIO_CFG(64, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT3 */
      PCOM_GPIO_CFG(65, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT2 */
      PCOM_GPIO_CFG(66, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT1 */
      PCOM_GPIO_CFG(67, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT0 */
};

static uint opt_disable_sdcard;

static int __init trout_disablesdcard_setup(char *str)
{
      int cal = simple_strtol(str, NULL, 0);
      
      opt_disable_sdcard = cal;
      return 1;
}

__setup("board_trout.disable_sdcard=", trout_disablesdcard_setup);

static struct vreg *vreg_sdslot;    /* SD slot power */

00074 struct mmc_vdd_xlat {
      int mask;
      int level;
};

static struct mmc_vdd_xlat mmc_vdd_table[] = {
      { MMC_VDD_165_195,      1800 },
      { MMC_VDD_20_21,  2050 },
      { MMC_VDD_21_22,  2150 },
      { MMC_VDD_22_23,  2250 },
      { MMC_VDD_23_24,  2350 },
      { MMC_VDD_24_25,  2450 },
      { MMC_VDD_25_26,  2550 },
      { MMC_VDD_26_27,  2650 },
      { MMC_VDD_27_28,  2750 },
      { MMC_VDD_28_29,  2850 },
      { MMC_VDD_29_30,  2950 },
};

static unsigned int sdslot_vdd = 0xffffffff;
static unsigned int sdslot_vreg_enabled;

static uint32_t trout_sdslot_switchvdd(struct device *dev, unsigned int vdd)
{
      int i, rc;

      BUG_ON(!vreg_sdslot);

      if (vdd == sdslot_vdd)
            return 0;

      sdslot_vdd = vdd;

      if (vdd == 0) {
#if DEBUG_SDSLOT_VDD
            printk("%s: Disabling SD slot power\n", __func__);
#endif
            config_gpio_table(sdcard_off_gpio_table,
                          ARRAY_SIZE(sdcard_off_gpio_table));
            vreg_disable(vreg_sdslot);
            sdslot_vreg_enabled = 0;
            return 0;
      }

      if (!sdslot_vreg_enabled) {
            rc = vreg_enable(vreg_sdslot);
            if (rc) {
                  printk(KERN_ERR "%s: Error enabling vreg (%d)\n",
                         __func__, rc);
            }
            config_gpio_table(sdcard_on_gpio_table,
                          ARRAY_SIZE(sdcard_on_gpio_table));
            sdslot_vreg_enabled = 1;
      }

      for (i = 0; i < ARRAY_SIZE(mmc_vdd_table); i++) {
            if (mmc_vdd_table[i].mask == (1 << vdd)) {
#if DEBUG_SDSLOT_VDD
                  printk("%s: Setting level to %u\n",
                          __func__, mmc_vdd_table[i].level);
#endif
                  rc = vreg_set_level(vreg_sdslot,
                                  mmc_vdd_table[i].level);
                  if (rc) {
                        printk(KERN_ERR
                               "%s: Error setting vreg level (%d)\n",
                               __func__, rc);
                  }
                  return 0;
            }
      }

      printk(KERN_ERR "%s: Invalid VDD %d specified\n", __func__, vdd);
      return 0;
}

static unsigned int trout_sdslot_status(struct device *dev)
{
      unsigned int status;

      status = (unsigned int) gpio_get_value(TROUT_GPIO_SDMC_CD_N);
      return (!status);
}

#define TROUT_MMC_VDD   MMC_VDD_165_195 | MMC_VDD_20_21 | MMC_VDD_21_22 \
                  | MMC_VDD_22_23 | MMC_VDD_23_24 | MMC_VDD_24_25 \
                  | MMC_VDD_25_26 | MMC_VDD_26_27 | MMC_VDD_27_28 \
                  | MMC_VDD_28_29 | MMC_VDD_29_30

static struct msm_mmc_platform_data trout_sdslot_data = {
      .ocr_mask   = TROUT_MMC_VDD,
      .status           = trout_sdslot_status,
      .translate_vdd    = trout_sdslot_switchvdd,
};

int __init trout_init_mmc(unsigned int sys_rev)
{
      sdslot_vreg_enabled = 0;

      vreg_sdslot = vreg_get(0, "gp6");
      if (IS_ERR(vreg_sdslot))
            return PTR_ERR(vreg_sdslot);

      set_irq_wake(TROUT_GPIO_TO_INT(TROUT_GPIO_SDMC_CD_N), 1);

      if (!opt_disable_sdcard)
            msm_add_sdcc(2, &trout_sdslot_data,
                       TROUT_GPIO_TO_INT(TROUT_GPIO_SDMC_CD_N), 0);
      else
            printk(KERN_INFO "trout: SD-Card interface disabled\n");
      return 0;
}


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