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mmc-twl4030.c

/*
 * linux/arch/arm/mach-omap2/mmc-twl4030.c
 *
 * Copyright (C) 2007-2008 Texas Instruments
 * Copyright (C) 2008 Nokia Corporation
 * Author: Texas Instruments
 *
 * 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/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/mmc/host.h>
#include <linux/regulator/consumer.h>

#include <mach/hardware.h>
#include <mach/control.h>
#include <mach/mmc.h>
#include <mach/board.h>

#include "mmc-twl4030.h"


#if defined(CONFIG_REGULATOR) && \
      (defined(CONFIG_MMC_OMAP_HS) || defined(CONFIG_MMC_OMAP_HS_MODULE))

static u16 control_pbias_offset;
static u16 control_devconf1_offset;

#define HSMMC_NAME_LEN  9

static struct twl_mmc_controller {
      struct omap_mmc_platform_data *mmc;
      /* Vcc == configured supply
       * Vcc_alt == optional
       *   -      MMC1, supply for DAT4..DAT7
       *   -      MMC2/MMC2, external level shifter voltage supply, for
       *    chip (SDIO, eMMC, etc) or transceiver (MMC2 only)
       */
      struct regulator        *vcc;
      struct regulator        *vcc_aux;
      char                    name[HSMMC_NAME_LEN + 1];
} hsmmc[OMAP34XX_NR_MMC];

static int twl_mmc_card_detect(int irq)
{
      unsigned i;

      for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
            struct omap_mmc_platform_data *mmc;

            mmc = hsmmc[i].mmc;
            if (!mmc)
                  continue;
            if (irq != mmc->slots[0].card_detect_irq)
                  continue;

            /* NOTE: assumes card detect signal is active-low */
            return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
      }
      return -ENOSYS;
}

static int twl_mmc_get_ro(struct device *dev, int slot)
{
      struct omap_mmc_platform_data *mmc = dev->platform_data;

      /* NOTE: assumes write protect signal is active-high */
      return gpio_get_value_cansleep(mmc->slots[0].gpio_wp);
}

static int twl_mmc_get_cover_state(struct device *dev, int slot)
{
      struct omap_mmc_platform_data *mmc = dev->platform_data;

      /* NOTE: assumes card detect signal is active-low */
      return !gpio_get_value_cansleep(mmc->slots[0].switch_pin);
}

/*
 * MMC Slot Initialization.
 */
static int twl_mmc_late_init(struct device *dev)
{
      struct omap_mmc_platform_data *mmc = dev->platform_data;
      int ret = 0;
      int i;

      /* MMC/SD/SDIO doesn't require a card detect switch */
      if (gpio_is_valid(mmc->slots[0].switch_pin)) {
            ret = gpio_request(mmc->slots[0].switch_pin, "mmc_cd");
            if (ret)
                  goto done;
            ret = gpio_direction_input(mmc->slots[0].switch_pin);
            if (ret)
                  goto err;
      }

      /* require at least main regulator */
      for (i = 0; i < ARRAY_SIZE(hsmmc); i++) {
            if (hsmmc[i].name == mmc->slots[0].name) {
                  struct regulator *reg;

                  hsmmc[i].mmc = mmc;

                  reg = regulator_get(dev, "vmmc");
                  if (IS_ERR(reg)) {
                        dev_dbg(dev, "vmmc regulator missing\n");
                        /* HACK: until fixed.c regulator is usable,
                         * we don't require a main regulator
                         * for MMC2 or MMC3
                         */
                        if (i != 0)
                              break;
                        ret = PTR_ERR(reg);
                        hsmmc[i].vcc = NULL;
                        goto err;
                  }
                  hsmmc[i].vcc = reg;
                  mmc->slots[0].ocr_mask = mmc_regulator_get_ocrmask(reg);

                  /* allow an aux regulator */
                  reg = regulator_get(dev, "vmmc_aux");
                  hsmmc[i].vcc_aux = IS_ERR(reg) ? NULL : reg;

                  /* UGLY HACK:  workaround regulator framework bugs.
                   * When the bootloader leaves a supply active, it's
                   * initialized with zero usecount ... and we can't
                   * disable it without first enabling it.  Until the
                   * framework is fixed, we need a workaround like this
                   * (which is safe for MMC, but not in general).
                   */
                  if (regulator_is_enabled(hsmmc[i].vcc) > 0) {
                        regulator_enable(hsmmc[i].vcc);
                        regulator_disable(hsmmc[i].vcc);
                  }
                  if (hsmmc[i].vcc_aux) {
                        if (regulator_is_enabled(reg) > 0) {
                              regulator_enable(reg);
                              regulator_disable(reg);
                        }
                  }

                  break;
            }
      }

      return 0;

err:
      gpio_free(mmc->slots[0].switch_pin);
done:
      mmc->slots[0].card_detect_irq = 0;
      mmc->slots[0].card_detect = NULL;

      dev_err(dev, "err %d configuring card detect\n", ret);
      return ret;
}

static void twl_mmc_cleanup(struct device *dev)
{
      struct omap_mmc_platform_data *mmc = dev->platform_data;
      int i;

      gpio_free(mmc->slots[0].switch_pin);
      for(i = 0; i < ARRAY_SIZE(hsmmc); i++) {
            regulator_put(hsmmc[i].vcc);
            regulator_put(hsmmc[i].vcc_aux);
      }
}

#ifdef CONFIG_PM

static int twl_mmc_suspend(struct device *dev, int slot)
{
      struct omap_mmc_platform_data *mmc = dev->platform_data;

      disable_irq(mmc->slots[0].card_detect_irq);
      return 0;
}

static int twl_mmc_resume(struct device *dev, int slot)
{
      struct omap_mmc_platform_data *mmc = dev->platform_data;

      enable_irq(mmc->slots[0].card_detect_irq);
      return 0;
}

#else
#define twl_mmc_suspend NULL
#define twl_mmc_resume  NULL
#endif

#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)

static int twl4030_mmc_get_context_loss(struct device *dev)
{
      /* FIXME: PM DPS not implemented yet */
      return 0;
}

#else
#define twl4030_mmc_get_context_loss NULL
#endif

static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
                        int vdd)
{
      u32 reg;
      int ret = 0;
      struct twl_mmc_controller *c = &hsmmc[0];
      struct omap_mmc_platform_data *mmc = dev->platform_data;

      /*
       * Assume we power both OMAP VMMC1 (for CMD, CLK, DAT0..3) and the
       * card with Vcc regulator (from twl4030 or whatever).  OMAP has both
       * 1.8V and 3.0V modes, controlled by the PBIAS register.
       *
       * In 8-bit modes, OMAP VMMC1A (for DAT4..7) needs a supply, which
       * is most naturally TWL VSIM; those pins also use PBIAS.
       *
       * FIXME handle VMMC1A as needed ...
       */
      if (power_on) {
            if (cpu_is_omap2430()) {
                  reg = omap_ctrl_readl(OMAP243X_CONTROL_DEVCONF1);
                  if ((1 << vdd) >= MMC_VDD_30_31)
                        reg |= OMAP243X_MMC1_ACTIVE_OVERWRITE;
                  else
                        reg &= ~OMAP243X_MMC1_ACTIVE_OVERWRITE;
                  omap_ctrl_writel(reg, OMAP243X_CONTROL_DEVCONF1);
            }

            if (mmc->slots[0].internal_clock) {
                  reg = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
                  reg |= OMAP2_MMCSDIO1ADPCLKISEL;
                  omap_ctrl_writel(reg, OMAP2_CONTROL_DEVCONF0);
            }

            reg = omap_ctrl_readl(control_pbias_offset);
            reg |= OMAP2_PBIASSPEEDCTRL0;
            reg &= ~OMAP2_PBIASLITEPWRDNZ0;
            omap_ctrl_writel(reg, control_pbias_offset);

            ret = mmc_regulator_set_ocr(c->vcc, vdd);

            /* 100ms delay required for PBIAS configuration */
            msleep(100);
            reg = omap_ctrl_readl(control_pbias_offset);
            reg |= (OMAP2_PBIASLITEPWRDNZ0 | OMAP2_PBIASSPEEDCTRL0);
            if ((1 << vdd) <= MMC_VDD_165_195)
                  reg &= ~OMAP2_PBIASLITEVMODE0;
            else
                  reg |= OMAP2_PBIASLITEVMODE0;
            omap_ctrl_writel(reg, control_pbias_offset);
      } else {
            reg = omap_ctrl_readl(control_pbias_offset);
            reg &= ~OMAP2_PBIASLITEPWRDNZ0;
            omap_ctrl_writel(reg, control_pbias_offset);

            ret = mmc_regulator_set_ocr(c->vcc, 0);

            /* 100ms delay required for PBIAS configuration */
            msleep(100);
            reg = omap_ctrl_readl(control_pbias_offset);
            reg |= (OMAP2_PBIASSPEEDCTRL0 | OMAP2_PBIASLITEPWRDNZ0 |
                  OMAP2_PBIASLITEVMODE0);
            omap_ctrl_writel(reg, control_pbias_offset);
      }

      return ret;
}

static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int vdd)
{
      int ret = 0;
      struct twl_mmc_controller *c = NULL;
      struct omap_mmc_platform_data *mmc = dev->platform_data;
      int i;

      for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
            if (mmc == hsmmc[i].mmc) {
                  c = &hsmmc[i];
                  break;
            }
      }

      if (c == NULL)
            return -ENODEV;

      /* If we don't see a Vcc regulator, assume it's a fixed
       * voltage always-on regulator.
       */
      if (!c->vcc)
            return 0;

      /*
       * Assume Vcc regulator is used only to power the card ... OMAP
       * VDDS is used to power the pins, optionally with a transceiver to
       * support cards using voltages other than VDDS (1.8V nominal).  When a
       * transceiver is used, DAT3..7 are muxed as transceiver control pins.
       *
       * In some cases this regulator won't support enable/disable;
       * e.g. it's a fixed rail for a WLAN chip.
       *
       * In other cases vcc_aux switches interface power.  Example, for
       * eMMC cards it represents VccQ.  Sometimes transceivers or SDIO
       * chips/cards need an interface voltage rail too.
       */
      if (power_on) {
            /* only MMC2 supports a CLKIN */
            if (mmc->slots[0].internal_clock) {
                  u32 reg;

                  reg = omap_ctrl_readl(control_devconf1_offset);
                  reg |= OMAP2_MMCSDIO2ADPCLKISEL;
                  omap_ctrl_writel(reg, control_devconf1_offset);
            }
            ret = mmc_regulator_set_ocr(c->vcc, vdd);
            /* enable interface voltage rail, if needed */
            if (ret == 0 && c->vcc_aux) {
                  ret = regulator_enable(c->vcc_aux);
                  if (ret < 0)
                        ret = mmc_regulator_set_ocr(c->vcc, 0);
            }
      } else {
            if (c->vcc_aux && (ret = regulator_is_enabled(c->vcc_aux)) > 0)
                  ret = regulator_disable(c->vcc_aux);
            if (ret == 0)
                  ret = mmc_regulator_set_ocr(c->vcc, 0);
      }

      return ret;
}

static int twl_mmc1_set_sleep(struct device *dev, int slot, int sleep, int vdd,
                        int cardsleep)
{
      struct twl_mmc_controller *c = &hsmmc[0];
      int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;

      return regulator_set_mode(c->vcc, mode);
}

static int twl_mmc23_set_sleep(struct device *dev, int slot, int sleep, int vdd,
                         int cardsleep)
{
      struct twl_mmc_controller *c = NULL;
      struct omap_mmc_platform_data *mmc = dev->platform_data;
      int i, err, mode;

      for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
            if (mmc == hsmmc[i].mmc) {
                  c = &hsmmc[i];
                  break;
            }
      }

      if (c == NULL)
            return -ENODEV;

      /*
       * If we don't see a Vcc regulator, assume it's a fixed
       * voltage always-on regulator.
       */
      if (!c->vcc)
            return 0;

      mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;

      if (!c->vcc_aux)
            return regulator_set_mode(c->vcc, mode);

      if (cardsleep) {
            /* VCC can be turned off if card is asleep */
            struct regulator *vcc_aux = c->vcc_aux;

            c->vcc_aux = NULL;
            if (sleep)
                  err = twl_mmc23_set_power(dev, slot, 0, 0);
            else
                  err = twl_mmc23_set_power(dev, slot, 1, vdd);
            c->vcc_aux = vcc_aux;
      } else
            err = regulator_set_mode(c->vcc, mode);
      if (err)
            return err;
      return regulator_set_mode(c->vcc_aux, mode);
}

static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;

void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
{
      struct twl4030_hsmmc_info *c;
      int nr_hsmmc = ARRAY_SIZE(hsmmc_data);

      if (cpu_is_omap2430()) {
            control_pbias_offset = OMAP243X_CONTROL_PBIAS_LITE;
            control_devconf1_offset = OMAP243X_CONTROL_DEVCONF1;
            nr_hsmmc = 2;
      } else {
            control_pbias_offset = OMAP343X_CONTROL_PBIAS_LITE;
            control_devconf1_offset = OMAP343X_CONTROL_DEVCONF1;
      }

      for (c = controllers; c->mmc; c++) {
            struct twl_mmc_controller *twl = hsmmc + c->mmc - 1;
            struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];

            if (!c->mmc || c->mmc > nr_hsmmc) {
                  pr_debug("MMC%d: no such controller\n", c->mmc);
                  continue;
            }
            if (mmc) {
                  pr_debug("MMC%d: already configured\n", c->mmc);
                  continue;
            }

            mmc = kzalloc(sizeof(struct omap_mmc_platform_data), GFP_KERNEL);
            if (!mmc) {
                  pr_err("Cannot allocate memory for mmc device!\n");
                  return;
            }

            if (c->name)
                  strncpy(twl->name, c->name, HSMMC_NAME_LEN);
            else
                  snprintf(twl->name, ARRAY_SIZE(twl->name),
                        "mmc%islot%i", c->mmc, 1);
            mmc->slots[0].name = twl->name;
            mmc->nr_slots = 1;
            mmc->slots[0].wires = c->wires;
            mmc->slots[0].internal_clock = !c->ext_clock;
            mmc->dma_mask = 0xffffffff;
            mmc->init = twl_mmc_late_init;

            /* note: twl4030 card detect GPIOs can disable VMMCx ... */
            if (gpio_is_valid(c->gpio_cd)) {
                  mmc->cleanup = twl_mmc_cleanup;
                  mmc->suspend = twl_mmc_suspend;
                  mmc->resume = twl_mmc_resume;

                  mmc->slots[0].switch_pin = c->gpio_cd;
                  mmc->slots[0].card_detect_irq = gpio_to_irq(c->gpio_cd);
                  if (c->cover_only)
                        mmc->slots[0].get_cover_state = twl_mmc_get_cover_state;
                  else
                        mmc->slots[0].card_detect = twl_mmc_card_detect;
            } else
                  mmc->slots[0].switch_pin = -EINVAL;

            mmc->get_context_loss_count =
                        twl4030_mmc_get_context_loss;

            /* write protect normally uses an OMAP gpio */
            if (gpio_is_valid(c->gpio_wp)) {
                  gpio_request(c->gpio_wp, "mmc_wp");
                  gpio_direction_input(c->gpio_wp);

                  mmc->slots[0].gpio_wp = c->gpio_wp;
                  mmc->slots[0].get_ro = twl_mmc_get_ro;
            } else
                  mmc->slots[0].gpio_wp = -EINVAL;

            if (c->nonremovable)
                  mmc->slots[0].nonremovable = 1;

            if (c->power_saving)
                  mmc->slots[0].power_saving = 1;

            /* NOTE:  MMC slots should have a Vcc regulator set up.
             * This may be from a TWL4030-family chip, another
             * controllable regulator, or a fixed supply.
             *
             * temporary HACK: ocr_mask instead of fixed supply
             */
            mmc->slots[0].ocr_mask = c->ocr_mask;

            switch (c->mmc) {
            case 1:
                  /* on-chip level shifting via PBIAS0/PBIAS1 */
                  mmc->slots[0].set_power = twl_mmc1_set_power;
                  mmc->slots[0].set_sleep = twl_mmc1_set_sleep;
                  break;
            case 2:
                  if (c->ext_clock)
                        c->transceiver = 1;
                  if (c->transceiver && c->wires > 4)
                        c->wires = 4;
                  /* FALLTHROUGH */
            case 3:
                  /* off-chip level shifting, or none */
                  mmc->slots[0].set_power = twl_mmc23_set_power;
                  mmc->slots[0].set_sleep = twl_mmc23_set_sleep;
                  break;
            default:
                  pr_err("MMC%d configuration not supported!\n", c->mmc);
                  kfree(mmc);
                  continue;
            }
            hsmmc_data[c->mmc - 1] = mmc;
      }

      omap2_init_mmc(hsmmc_data, OMAP34XX_NR_MMC);

      /* pass the device nodes back to board setup code */
      for (c = controllers; c->mmc; c++) {
            struct omap_mmc_platform_data *mmc = hsmmc_data[c->mmc - 1];

            if (!c->mmc || c->mmc > nr_hsmmc)
                  continue;
            c->dev = mmc->dev;
      }
}

#endif

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