sdhci-s3c.c

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/* linux/drivers/mmc/host/sdhci-s3c.c
 *
 * Copyright 2008 Openmoko Inc.
 * Copyright 2008 Simtec Electronics
 *      Ben Dooks <[email protected]>
 *      http://armlinux.simtec.co.uk/
 *
 * SDHCI (HSMMC) support for Samsung SoC
 *
 * 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/delay.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>

#include <linux/mmc/host.h>

#include <plat/sdhci.h>
#include <plat/regs-sdhci.h>

#include "sdhci.h"

#define MAX_BUS_CLK (4)

/* Number of gpio's used is max data bus width + command and clock lines */
#define NUM_GPIOS(x)    (x + 2)

struct sdhci_s3c {
    struct sdhci_host   *host;
    struct platform_device  *pdev;
    struct resource     *ioarea;
    struct s3c_sdhci_platdata *pdata;
    unsigned int        cur_clk;
    int         ext_cd_irq;
    int         ext_cd_gpio;
    int         *gpios;

    struct clk      *clk_io;
    struct clk      *clk_bus[MAX_BUS_CLK];
};

struct sdhci_s3c_drv_data {
    unsigned int    sdhci_quirks;
};

static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
{
    return sdhci_priv(host);
}

static u32 get_curclk(u32 ctrl2)
{
    ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
    ctrl2 >>= S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;

    return ctrl2;
}

static void sdhci_s3c_check_sclk(struct sdhci_host *host)
{
    struct sdhci_s3c *ourhost = to_s3c(host);
    u32 tmp = readl(host->ioaddr + S3C_SDHCI_CONTROL2);

    if (get_curclk(tmp) != ourhost->cur_clk) {
        dev_dbg(&ourhost->pdev->dev, "restored ctrl2 clock setting\n");

        tmp &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
        tmp |= ourhost->cur_clk << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
        writel(tmp, host->ioaddr + S3C_SDHCI_CONTROL2);
    }
}

static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
{
    struct sdhci_s3c *ourhost = to_s3c(host);
    struct clk *busclk;
    unsigned int rate, max;
    int clk;

    /* note, a reset will reset the clock source */

    sdhci_s3c_check_sclk(host);

    for (max = 0, clk = 0; clk < MAX_BUS_CLK; clk++) {
        busclk = ourhost->clk_bus[clk];
        if (!busclk)
            continue;

        rate = clk_get_rate(busclk);
        if (rate > max)
            max = rate;
    }

    return max;
}

static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
                         unsigned int src,
                         unsigned int wanted)
{
    unsigned long rate;
    struct clk *clksrc = ourhost->clk_bus[src];
    int div;

    if (!clksrc)
        return UINT_MAX;

    /*
     * If controller uses a non-standard clock division, find the best clock
     * speed possible with selected clock source and skip the division.
     */
    if (ourhost->host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK) {
        rate = clk_round_rate(clksrc, wanted);
        return wanted - rate;
    }

    rate = clk_get_rate(clksrc);

    for (div = 1; div < 256; div *= 2) {
        if ((rate / div) <= wanted)
            break;
    }

    dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
        src, rate, wanted, rate / div);

    return wanted - (rate / div);
}

static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
{
    struct sdhci_s3c *ourhost = to_s3c(host);
    unsigned int best = UINT_MAX;
    unsigned int delta;
    int best_src = 0;
    int src;
    u32 ctrl;

    /* don't bother if the clock is going off. */
    if (clock == 0)
        return;

    for (src = 0; src < MAX_BUS_CLK; src++) {
        delta = sdhci_s3c_consider_clock(ourhost, src, clock);
        if (delta < best) {
            best = delta;
            best_src = src;
        }
    }

    dev_dbg(&ourhost->pdev->dev,
        "selected source %d, clock %d, delta %d\n",
         best_src, clock, best);

    /* select the new clock source */
    if (ourhost->cur_clk != best_src) {
        struct clk *clk = ourhost->clk_bus[best_src];

        clk_prepare_enable(clk);
        clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);

        /* turn clock off to card before changing clock source */
        writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);

        ourhost->cur_clk = best_src;
        host->max_clk = clk_get_rate(clk);

        ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
        ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
        ctrl |= best_src << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
        writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
    }

    /* reprogram default hardware configuration */
    writel(S3C64XX_SDHCI_CONTROL4_DRIVE_9mA,
        host->ioaddr + S3C64XX_SDHCI_CONTROL4);

    ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
    ctrl |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
          S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
          S3C_SDHCI_CTRL2_ENFBCLKRX |
          S3C_SDHCI_CTRL2_DFCNT_NONE |
          S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
    writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);

    /* reconfigure the controller for new clock rate */
    ctrl = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
    if (clock < 25 * 1000000)
        ctrl |= (S3C_SDHCI_CTRL3_FCSEL3 | S3C_SDHCI_CTRL3_FCSEL2);
    writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL3);
}

static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host)
{
    struct sdhci_s3c *ourhost = to_s3c(host);
    unsigned int delta, min = UINT_MAX;
    int src;

    for (src = 0; src < MAX_BUS_CLK; src++) {
        delta = sdhci_s3c_consider_clock(ourhost, src, 0);
        if (delta == UINT_MAX)
            continue;
        /* delta is a negative value in this case */
        if (-delta < min)
            min = -delta;
    }
    return min;
}

/* sdhci_cmu_get_max_clk - callback to get maximum clock frequency.*/
static unsigned int sdhci_cmu_get_max_clock(struct sdhci_host *host)
{
    struct sdhci_s3c *ourhost = to_s3c(host);

    return clk_round_rate(ourhost->clk_bus[ourhost->cur_clk], UINT_MAX);
}

/* sdhci_cmu_get_min_clock - callback to get minimal supported clock value. */
static unsigned int sdhci_cmu_get_min_clock(struct sdhci_host *host)
{
    struct sdhci_s3c *ourhost = to_s3c(host);

    /*
     * initial clock can be in the frequency range of
     * 100KHz-400KHz, so we set it as max value.
     */
    return clk_round_rate(ourhost->clk_bus[ourhost->cur_clk], 400000);
}

/* sdhci_cmu_set_clock - callback on clock change.*/
static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
{
    struct sdhci_s3c *ourhost = to_s3c(host);
    struct device *dev = &ourhost->pdev->dev;
    unsigned long timeout;
    u16 clk = 0;

    /* don't bother if the clock is going off */
    if (clock == 0)
        return;

    sdhci_s3c_set_clock(host, clock);

    clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);

    host->clock = clock;

    clk = SDHCI_CLOCK_INT_EN;
    sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

    /* Wait max 20 ms */
    timeout = 20;
    while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
        & SDHCI_CLOCK_INT_STABLE)) {
        if (timeout == 0) {
            dev_err(dev, "%s: Internal clock never stabilised.\n",
                mmc_hostname(host->mmc));
            return;
        }
        timeout--;
        mdelay(1);
    }

    clk |= SDHCI_CLOCK_CARD_EN;
    sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
}

static int sdhci_s3c_platform_8bit_width(struct sdhci_host *host, int width)
{
    u8 ctrl;

    ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);

    switch (width) {
    case MMC_BUS_WIDTH_8:
        ctrl |= SDHCI_CTRL_8BITBUS;
        ctrl &= ~SDHCI_CTRL_4BITBUS;
        break;
    case MMC_BUS_WIDTH_4:
        ctrl |= SDHCI_CTRL_4BITBUS;
        ctrl &= ~SDHCI_CTRL_8BITBUS;
        break;
    default:
        ctrl &= ~SDHCI_CTRL_4BITBUS;
        ctrl &= ~SDHCI_CTRL_8BITBUS;
        break;
    }

    sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);

    return 0;
}

static struct sdhci_ops sdhci_s3c_ops = {
    .get_max_clock      = sdhci_s3c_get_max_clk,
    .set_clock      = sdhci_s3c_set_clock,
    .get_min_clock      = sdhci_s3c_get_min_clock,
    .platform_8bit_width    = sdhci_s3c_platform_8bit_width,
};

static void sdhci_s3c_notify_change(struct platform_device *dev, int state)
{
    struct sdhci_host *host = platform_get_drvdata(dev);
    struct sdhci_s3c *sc = sdhci_priv(host);
    unsigned long flags;

    if (host) {
        spin_lock_irqsave(&host->lock, flags);
        if (state) {
            dev_dbg(&dev->dev, "card inserted.\n");
#ifdef CONFIG_PM_RUNTIME
            clk_prepare_enable(sc->clk_io);
#endif
            host->flags &= ~SDHCI_DEVICE_DEAD;
            host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
        } else {
            dev_dbg(&dev->dev, "card removed.\n");
            host->flags |= SDHCI_DEVICE_DEAD;
            host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
#ifdef CONFIG_PM_RUNTIME
            clk_disable_unprepare(sc->clk_io);
#endif
        }
        tasklet_schedule(&host->card_tasklet);
        spin_unlock_irqrestore(&host->lock, flags);
    }
}

static irqreturn_t sdhci_s3c_gpio_card_detect_thread(int irq, void *dev_id)
{
    struct sdhci_s3c *sc = dev_id;
    int status = gpio_get_value(sc->ext_cd_gpio);
    if (sc->pdata->ext_cd_gpio_invert)
        status = !status;
    sdhci_s3c_notify_change(sc->pdev, status);
    return IRQ_HANDLED;
}

static void sdhci_s3c_setup_card_detect_gpio(struct sdhci_s3c *sc)
{
    struct s3c_sdhci_platdata *pdata = sc->pdata;
    struct device *dev = &sc->pdev->dev;

    if (gpio_request(pdata->ext_cd_gpio, "SDHCI EXT CD") == 0) {
        sc->ext_cd_gpio = pdata->ext_cd_gpio;
        sc->ext_cd_irq = gpio_to_irq(pdata->ext_cd_gpio);
        if (sc->ext_cd_irq &&
            request_threaded_irq(sc->ext_cd_irq, NULL,
                     sdhci_s3c_gpio_card_detect_thread,
                     IRQF_TRIGGER_RISING |
                     IRQF_TRIGGER_FALLING |
                     IRQF_ONESHOT,
                     dev_name(dev), sc) == 0) {
            int status = gpio_get_value(sc->ext_cd_gpio);
            if (pdata->ext_cd_gpio_invert)
                status = !status;
            sdhci_s3c_notify_change(sc->pdev, status);
        } else {
            dev_warn(dev, "cannot request irq for card detect\n");
            sc->ext_cd_irq = 0;
        }
    } else {
        dev_err(dev, "cannot request gpio for card detect\n");
    }
}

#ifdef CONFIG_OF
static int __devinit sdhci_s3c_parse_dt(struct device *dev,
        struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
{
    struct device_node *node = dev->of_node;
    struct sdhci_s3c *ourhost = to_s3c(host);
    u32 max_width;
    int gpio, cnt, ret;

    /* if the bus-width property is not specified, assume width as 1 */
    if (of_property_read_u32(node, "bus-width", &max_width))
        max_width = 1;
    pdata->max_width = max_width;

    ourhost->gpios = devm_kzalloc(dev, NUM_GPIOS(pdata->max_width) *
                sizeof(int), GFP_KERNEL);
    if (!ourhost->gpios)
        return -ENOMEM;

    /* get the card detection method */
    if (of_get_property(node, "broken-cd", 0)) {
        pdata->cd_type = S3C_SDHCI_CD_NONE;
        goto setup_bus;
    }

    if (of_get_property(node, "non-removable", 0)) {
        pdata->cd_type = S3C_SDHCI_CD_PERMANENT;
        goto setup_bus;
    }

    gpio = of_get_named_gpio(node, "cd-gpios", 0);
    if (gpio_is_valid(gpio)) {
        pdata->cd_type = S3C_SDHCI_CD_GPIO;
        goto found_cd;
    } else if (gpio != -ENOENT) {
        dev_err(dev, "invalid card detect gpio specified\n");
        return -EINVAL;
    }

    gpio = of_get_named_gpio(node, "samsung,cd-pinmux-gpio", 0);
    if (gpio_is_valid(gpio)) {
        pdata->cd_type = S3C_SDHCI_CD_INTERNAL;
        goto found_cd;
    } else if (gpio != -ENOENT) {
        dev_err(dev, "invalid card detect gpio specified\n");
        return -EINVAL;
    }

    dev_info(dev, "assuming no card detect line available\n");
    pdata->cd_type = S3C_SDHCI_CD_NONE;

 found_cd:
    if (pdata->cd_type == S3C_SDHCI_CD_GPIO) {
        pdata->ext_cd_gpio = gpio;
        ourhost->ext_cd_gpio = -1;
        if (of_get_property(node, "cd-inverted", NULL))
            pdata->ext_cd_gpio_invert = 1;
    } else if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL) {
        ret = gpio_request(gpio, "sdhci-cd");
        if (ret) {
            dev_err(dev, "card detect gpio request failed\n");
            return -EINVAL;
        }
        ourhost->ext_cd_gpio = gpio;
    }

 setup_bus:
    /* get the gpios for command, clock and data lines */
    for (cnt = 0; cnt < NUM_GPIOS(pdata->max_width); cnt++) {
        gpio = of_get_gpio(node, cnt);
        if (!gpio_is_valid(gpio)) {
            dev_err(dev, "invalid gpio[%d]\n", cnt);
            goto err_free_dt_cd_gpio;
        }
        ourhost->gpios[cnt] = gpio;
    }

    for (cnt = 0; cnt < NUM_GPIOS(pdata->max_width); cnt++) {
        ret = gpio_request(ourhost->gpios[cnt], "sdhci-gpio");
        if (ret) {
            dev_err(dev, "gpio[%d] request failed\n", cnt);
            goto err_free_dt_gpios;
        }
    }

    return 0;

 err_free_dt_gpios:
    while (--cnt >= 0)
        gpio_free(ourhost->gpios[cnt]);
 err_free_dt_cd_gpio:
    if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL)
        gpio_free(ourhost->ext_cd_gpio);
    return -EINVAL;
}
#else
static int __devinit sdhci_s3c_parse_dt(struct device *dev,
        struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
{
    return -EINVAL;
}
#endif

static const struct of_device_id sdhci_s3c_dt_match[];

static inline struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
            struct platform_device *pdev)
{
#ifdef CONFIG_OF
    if (pdev->dev.of_node) {
        const struct of_device_id *match;
        match = of_match_node(sdhci_s3c_dt_match, pdev->dev.of_node);
        return (struct sdhci_s3c_drv_data *)match->data;
    }
#endif
    return (struct sdhci_s3c_drv_data *)
            platform_get_device_id(pdev)->driver_data;
}

static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
{
    struct s3c_sdhci_platdata *pdata;
    struct sdhci_s3c_drv_data *drv_data;
    struct device *dev = &pdev->dev;
    struct sdhci_host *host;
    struct sdhci_s3c *sc;
    struct resource *res;
    int ret, irq, ptr, clks;

    if (!pdev->dev.platform_data && !pdev->dev.of_node) {
        dev_err(dev, "no device data specified\n");
        return -ENOENT;
    }

    irq = platform_get_irq(pdev, 0);
    if (irq < 0) {
        dev_err(dev, "no irq specified\n");
        return irq;
    }

    host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
    if (IS_ERR(host)) {
        dev_err(dev, "sdhci_alloc_host() failed\n");
        return PTR_ERR(host);
    }
    sc = sdhci_priv(host);

    pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
    if (!pdata) {
        ret = -ENOMEM;
        goto err_pdata;
    }

    if (pdev->dev.of_node) {
        ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);
        if (ret)
            goto err_pdata;
    } else {
        memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
        sc->ext_cd_gpio = -1; /* invalid gpio number */
    }

    drv_data = sdhci_s3c_get_driver_data(pdev);

    sc->host = host;
    sc->pdev = pdev;
    sc->pdata = pdata;

    platform_set_drvdata(pdev, host);

    sc->clk_io = clk_get(dev, "hsmmc");
    if (IS_ERR(sc->clk_io)) {
        dev_err(dev, "failed to get io clock\n");
        ret = PTR_ERR(sc->clk_io);
        goto err_io_clk;
    }

    /* enable the local io clock and keep it running for the moment. */
    clk_prepare_enable(sc->clk_io);

    for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
        struct clk *clk;
        char name[14];

        snprintf(name, 14, "mmc_busclk.%d", ptr);
        clk = clk_get(dev, name);
        if (IS_ERR(clk))
            continue;

        clks++;
        sc->clk_bus[ptr] = clk;

        /*
         * save current clock index to know which clock bus
         * is used later in overriding functions.
         */
        sc->cur_clk = ptr;

        dev_info(dev, "clock source %d: %s (%ld Hz)\n",
             ptr, name, clk_get_rate(clk));
    }

    if (clks == 0) {
        dev_err(dev, "failed to find any bus clocks\n");
        ret = -ENOENT;
        goto err_no_busclks;
    }

#ifndef CONFIG_PM_RUNTIME
    clk_prepare_enable(sc->clk_bus[sc->cur_clk]);
#endif

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    host->ioaddr = devm_request_and_ioremap(&pdev->dev, res);
    if (!host->ioaddr) {
        dev_err(dev, "failed to map registers\n");
        ret = -ENXIO;
        goto err_req_regs;
    }

    /* Ensure we have minimal gpio selected CMD/CLK/Detect */
    if (pdata->cfg_gpio)
        pdata->cfg_gpio(pdev, pdata->max_width);

    host->hw_name = "samsung-hsmmc";
    host->ops = &sdhci_s3c_ops;
    host->quirks = 0;
    host->irq = irq;

    /* Setup quirks for the controller */
    host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
    host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
    if (drv_data)
        host->quirks |= drv_data->sdhci_quirks;

#ifndef CONFIG_MMC_SDHCI_S3C_DMA

    /* we currently see overruns on errors, so disable the SDMA
     * support as well. */
    host->quirks |= SDHCI_QUIRK_BROKEN_DMA;

#endif /* CONFIG_MMC_SDHCI_S3C_DMA */

    /* It seems we do not get an DATA transfer complete on non-busy
     * transfers, not sure if this is a problem with this specific
     * SDHCI block, or a missing configuration that needs to be set. */
    host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;

    /* This host supports the Auto CMD12 */
    host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;

    /* Samsung SoCs need BROKEN_ADMA_ZEROLEN_DESC */
    host->quirks |= SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC;

    if (pdata->cd_type == S3C_SDHCI_CD_NONE ||
        pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
        host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;

    if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
        host->mmc->caps = MMC_CAP_NONREMOVABLE;

    switch (pdata->max_width) {
    case 8:
        host->mmc->caps |= MMC_CAP_8_BIT_DATA;
    case 4:
        host->mmc->caps |= MMC_CAP_4_BIT_DATA;
        break;
    }

    if (pdata->pm_caps)
        host->mmc->pm_caps |= pdata->pm_caps;

    host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
             SDHCI_QUIRK_32BIT_DMA_SIZE);

    /* HSMMC on Samsung SoCs uses SDCLK as timeout clock */
    host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;

    /*
     * If controller does not have internal clock divider,
     * we can use overriding functions instead of default.
     */
    if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK) {
        sdhci_s3c_ops.set_clock = sdhci_cmu_set_clock;
        sdhci_s3c_ops.get_min_clock = sdhci_cmu_get_min_clock;
        sdhci_s3c_ops.get_max_clock = sdhci_cmu_get_max_clock;
    }

    /* It supports additional host capabilities if needed */
    if (pdata->host_caps)
        host->mmc->caps |= pdata->host_caps;

    if (pdata->host_caps2)
        host->mmc->caps2 |= pdata->host_caps2;

    pm_runtime_enable(&pdev->dev);
    pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
    pm_runtime_use_autosuspend(&pdev->dev);
    pm_suspend_ignore_children(&pdev->dev, 1);

    ret = sdhci_add_host(host);
    if (ret) {
        dev_err(dev, "sdhci_add_host() failed\n");
        pm_runtime_forbid(&pdev->dev);
        pm_runtime_get_noresume(&pdev->dev);
        goto err_req_regs;
    }

    /* The following two methods of card detection might call
       sdhci_s3c_notify_change() immediately, so they can be called
       only after sdhci_add_host(). Setup errors are ignored. */
    if (pdata->cd_type == S3C_SDHCI_CD_EXTERNAL && pdata->ext_cd_init)
        pdata->ext_cd_init(&sdhci_s3c_notify_change);
    if (pdata->cd_type == S3C_SDHCI_CD_GPIO &&
        gpio_is_valid(pdata->ext_cd_gpio))
        sdhci_s3c_setup_card_detect_gpio(sc);

#ifdef CONFIG_PM_RUNTIME
    if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
        clk_disable_unprepare(sc->clk_io);
#endif
    return 0;

 err_req_regs:
#ifndef CONFIG_PM_RUNTIME
    clk_disable_unprepare(sc->clk_bus[sc->cur_clk]);
#endif
    for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
        if (sc->clk_bus[ptr]) {
            clk_put(sc->clk_bus[ptr]);
        }
    }

 err_no_busclks:
    clk_disable_unprepare(sc->clk_io);
    clk_put(sc->clk_io);

 err_io_clk:
    for (ptr = 0; ptr < NUM_GPIOS(sc->pdata->max_width); ptr++)
        gpio_free(sc->gpios[ptr]);
    if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL)
        gpio_free(sc->ext_cd_gpio);

 err_pdata:
    sdhci_free_host(host);

    return ret;
}

static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
{
    struct sdhci_host *host =  platform_get_drvdata(pdev);
    struct sdhci_s3c *sc = sdhci_priv(host);
    struct s3c_sdhci_platdata *pdata = sc->pdata;
    int ptr;

    if (pdata->cd_type == S3C_SDHCI_CD_EXTERNAL && pdata->ext_cd_cleanup)
        pdata->ext_cd_cleanup(&sdhci_s3c_notify_change);

    if (sc->ext_cd_irq)
        free_irq(sc->ext_cd_irq, sc);

    if (gpio_is_valid(sc->ext_cd_gpio))
        gpio_free(sc->ext_cd_gpio);

#ifdef CONFIG_PM_RUNTIME
    if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
        clk_prepare_enable(sc->clk_io);
#endif
    sdhci_remove_host(host, 1);

    pm_runtime_dont_use_autosuspend(&pdev->dev);
    pm_runtime_disable(&pdev->dev);

#ifndef CONFIG_PM_RUNTIME
    clk_disable_unprepare(sc->clk_bus[sc->cur_clk]);
#endif
    for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
        if (sc->clk_bus[ptr]) {
            clk_put(sc->clk_bus[ptr]);
        }
    }
    clk_disable_unprepare(sc->clk_io);
    clk_put(sc->clk_io);

    if (pdev->dev.of_node) {
        for (ptr = 0; ptr < NUM_GPIOS(sc->pdata->max_width); ptr++)
            gpio_free(sc->gpios[ptr]);
    }

    sdhci_free_host(host);
    platform_set_drvdata(pdev, NULL);

    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int sdhci_s3c_suspend(struct device *dev)
{
    struct sdhci_host *host = dev_get_drvdata(dev);

    return sdhci_suspend_host(host);
}

static int sdhci_s3c_resume(struct device *dev)
{
    struct sdhci_host *host = dev_get_drvdata(dev);

    return sdhci_resume_host(host);
}
#endif

#ifdef CONFIG_PM_RUNTIME
static int sdhci_s3c_runtime_suspend(struct device *dev)
{
    struct sdhci_host *host = dev_get_drvdata(dev);
    struct sdhci_s3c *ourhost = to_s3c(host);
    struct clk *busclk = ourhost->clk_io;
    int ret;

    ret = sdhci_runtime_suspend_host(host);

    clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);
    clk_disable_unprepare(busclk);
    return ret;
}

static int sdhci_s3c_runtime_resume(struct device *dev)
{
    struct sdhci_host *host = dev_get_drvdata(dev);
    struct sdhci_s3c *ourhost = to_s3c(host);
    struct clk *busclk = ourhost->clk_io;
    int ret;

    clk_prepare_enable(busclk);
    clk_prepare_enable(ourhost->clk_bus[ourhost->cur_clk]);
    ret = sdhci_runtime_resume_host(host);
    return ret;
}
#endif

#ifdef CONFIG_PM
static const struct dev_pm_ops sdhci_s3c_pmops = {
    SET_SYSTEM_SLEEP_PM_OPS(sdhci_s3c_suspend, sdhci_s3c_resume)
    SET_RUNTIME_PM_OPS(sdhci_s3c_runtime_suspend, sdhci_s3c_runtime_resume,
               NULL)
};

#define SDHCI_S3C_PMOPS (&sdhci_s3c_pmops)

#else
#define SDHCI_S3C_PMOPS NULL
#endif

#if defined(CONFIG_CPU_EXYNOS4210) || defined(CONFIG_SOC_EXYNOS4212)
static struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
    .sdhci_quirks = SDHCI_QUIRK_NONSTANDARD_CLOCK,
};
#define EXYNOS4_SDHCI_DRV_DATA ((kernel_ulong_t)&exynos4_sdhci_drv_data)
#else
#define EXYNOS4_SDHCI_DRV_DATA ((kernel_ulong_t)NULL)
#endif

static struct platform_device_id sdhci_s3c_driver_ids[] = {
    {
        .name       = "s3c-sdhci",
        .driver_data    = (kernel_ulong_t)NULL,
    }, {
        .name       = "exynos4-sdhci",
        .driver_data    = EXYNOS4_SDHCI_DRV_DATA,
    },
    { }
};
MODULE_DEVICE_TABLE(platform, sdhci_s3c_driver_ids);

#ifdef CONFIG_OF
static const struct of_device_id sdhci_s3c_dt_match[] = {
    { .compatible = "samsung,s3c6410-sdhci", },
    { .compatible = "samsung,exynos4210-sdhci",
        .data = (void *)EXYNOS4_SDHCI_DRV_DATA },
    {},
};
MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
#endif

static struct platform_driver sdhci_s3c_driver = {
    .probe      = sdhci_s3c_probe,
    .remove     = __devexit_p(sdhci_s3c_remove),
    .id_table   = sdhci_s3c_driver_ids,
    .driver     = {
        .owner  = THIS_MODULE,
        .name   = "s3c-sdhci",
        .of_match_table = of_match_ptr(sdhci_s3c_dt_match),
        .pm = SDHCI_S3C_PMOPS,
    },
};

module_platform_driver(sdhci_s3c_driver);

MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
MODULE_AUTHOR("Ben Dooks, <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:s3c-sdhci");