spi: allow registering empty spi_board_info lists

[mirror_ubuntu-bionic-kernel.git] / drivers / mmc / host / sdhci-esdhc-imx.c

/*
 * Freescale eSDHC i.MX controller driver for the platform bus.
 *
 * derived from the OF-version.
 *
 * Copyright (c) 2010 Pengutronix e.K.
 *   Author: Wolfram Sang <kernel@pengutronix.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 */

#include <linux/io.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_data/mmc-esdhc-imx.h>
#include <linux/pm_runtime.h>
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"

#define ESDHC_SYS_CTRL_DTOCV_MASK       0x0f
#define ESDHC_CTRL_D3CD                 0x08
#define ESDHC_BURST_LEN_EN_INCR         (1 << 27)
/* VENDOR SPEC register */
#define ESDHC_VENDOR_SPEC               0xc0
#define  ESDHC_VENDOR_SPEC_SDIO_QUIRK   (1 << 1)
#define  ESDHC_VENDOR_SPEC_VSELECT      (1 << 1)
#define  ESDHC_VENDOR_SPEC_FRC_SDCLK_ON (1 << 8)
#define ESDHC_WTMK_LVL                  0x44
#define  ESDHC_WTMK_DEFAULT_VAL         0x10401040
#define ESDHC_MIX_CTRL                  0x48
#define  ESDHC_MIX_CTRL_DDREN           (1 << 3)
#define  ESDHC_MIX_CTRL_AC23EN          (1 << 7)
#define  ESDHC_MIX_CTRL_EXE_TUNE        (1 << 22)
#define  ESDHC_MIX_CTRL_SMPCLK_SEL      (1 << 23)
#define  ESDHC_MIX_CTRL_AUTO_TUNE_EN    (1 << 24)
#define  ESDHC_MIX_CTRL_FBCLK_SEL       (1 << 25)
#define  ESDHC_MIX_CTRL_HS400_EN        (1 << 26)
/* Bits 3 and 6 are not SDHCI standard definitions */
#define  ESDHC_MIX_CTRL_SDHCI_MASK      0xb7
/* Tuning bits */
#define  ESDHC_MIX_CTRL_TUNING_MASK     0x03c00000

/* dll control register */
#define ESDHC_DLL_CTRL                  0x60
#define ESDHC_DLL_OVERRIDE_VAL_SHIFT    9
#define ESDHC_DLL_OVERRIDE_EN_SHIFT     8

/* tune control register */
#define ESDHC_TUNE_CTRL_STATUS          0x68
#define  ESDHC_TUNE_CTRL_STEP           1
#define  ESDHC_TUNE_CTRL_MIN            0
#define  ESDHC_TUNE_CTRL_MAX            ((1 << 7) - 1)

/* strobe dll register */
#define ESDHC_STROBE_DLL_CTRL           0x70
#define ESDHC_STROBE_DLL_CTRL_ENABLE    (1 << 0)
#define ESDHC_STROBE_DLL_CTRL_RESET     (1 << 1)
#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT      3

#define ESDHC_STROBE_DLL_STATUS         0x74
#define ESDHC_STROBE_DLL_STS_REF_LOCK   (1 << 1)
#define ESDHC_STROBE_DLL_STS_SLV_LOCK   0x1

#define ESDHC_TUNING_CTRL               0xcc
#define ESDHC_STD_TUNING_EN             (1 << 24)
/* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
#define ESDHC_TUNING_START_TAP_DEFAULT  0x1
#define ESDHC_TUNING_START_TAP_MASK     0xff
#define ESDHC_TUNING_STEP_MASK          0x00070000
#define ESDHC_TUNING_STEP_SHIFT         16

/* pinctrl state */
#define ESDHC_PINCTRL_STATE_100MHZ      "state_100mhz"
#define ESDHC_PINCTRL_STATE_200MHZ      "state_200mhz"

/*
 * Our interpretation of the SDHCI_HOST_CONTROL register
 */
#define ESDHC_CTRL_4BITBUS              (0x1 << 1)
#define ESDHC_CTRL_8BITBUS              (0x2 << 1)
#define ESDHC_CTRL_BUSWIDTH_MASK        (0x3 << 1)

/*
 * There is an INT DMA ERR mis-match between eSDHC and STD SDHC SPEC:
 * Bit25 is used in STD SPEC, and is reserved in fsl eSDHC design,
 * but bit28 is used as the INT DMA ERR in fsl eSDHC design.
 * Define this macro DMA error INT for fsl eSDHC
 */
#define ESDHC_INT_VENDOR_SPEC_DMA_ERR   (1 << 28)

/*
 * The CMDTYPE of the CMD register (offset 0xE) should be set to
 * "11" when the STOP CMD12 is issued on imx53 to abort one
 * open ended multi-blk IO. Otherwise the TC INT wouldn't
 * be generated.
 * In exact block transfer, the controller doesn't complete the
 * operations automatically as required at the end of the
 * transfer and remains on hold if the abort command is not sent.
 * As a result, the TC flag is not asserted and SW  received timeout
 * exeception. Bit1 of Vendor Spec registor is used to fix it.
 */
#define ESDHC_FLAG_MULTIBLK_NO_INT      BIT(1)
/*
 * The flag enables the workaround for ESDHC errata ENGcm07207 which
 * affects i.MX25 and i.MX35.
 */
#define ESDHC_FLAG_ENGCM07207           BIT(2)
/*
 * The flag tells that the ESDHC controller is an USDHC block that is
 * integrated on the i.MX6 series.
 */
#define ESDHC_FLAG_USDHC                BIT(3)
/* The IP supports manual tuning process */
#define ESDHC_FLAG_MAN_TUNING           BIT(4)
/* The IP supports standard tuning process */
#define ESDHC_FLAG_STD_TUNING           BIT(5)
/* The IP has SDHCI_CAPABILITIES_1 register */
#define ESDHC_FLAG_HAVE_CAP1            BIT(6)
/*
 * The IP has errata ERR004536
 * uSDHC: ADMA Length Mismatch Error occurs if the AHB read access is slow,
 * when reading data from the card
 */
#define ESDHC_FLAG_ERR004536            BIT(7)
/* The IP supports HS200 mode */
#define ESDHC_FLAG_HS200                BIT(8)
/* The IP supports HS400 mode */
#define ESDHC_FLAG_HS400                BIT(9)

/* A higher clock ferquency than this rate requires strobell dll control */
#define ESDHC_STROBE_DLL_CLK_FREQ       100000000

struct esdhc_soc_data {
        u32 flags;
};

static struct esdhc_soc_data esdhc_imx25_data = {
        .flags = ESDHC_FLAG_ENGCM07207,
};

static struct esdhc_soc_data esdhc_imx35_data = {
        .flags = ESDHC_FLAG_ENGCM07207,
};

static struct esdhc_soc_data esdhc_imx51_data = {
        .flags = 0,
};

static struct esdhc_soc_data esdhc_imx53_data = {
        .flags = ESDHC_FLAG_MULTIBLK_NO_INT,
};

static struct esdhc_soc_data usdhc_imx6q_data = {
        .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_MAN_TUNING,
};

static struct esdhc_soc_data usdhc_imx6sl_data = {
        .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
                        | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_ERR004536
                        | ESDHC_FLAG_HS200,
};

static struct esdhc_soc_data usdhc_imx6sx_data = {
        .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
                        | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200,
};

static struct esdhc_soc_data usdhc_imx7d_data = {
        .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING
                        | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200
                        | ESDHC_FLAG_HS400,
};

struct pltfm_imx_data {
        u32 scratchpad;
        struct pinctrl *pinctrl;
        struct pinctrl_state *pins_default;
        struct pinctrl_state *pins_100mhz;
        struct pinctrl_state *pins_200mhz;
        const struct esdhc_soc_data *socdata;
        struct esdhc_platform_data boarddata;
        struct clk *clk_ipg;
        struct clk *clk_ahb;
        struct clk *clk_per;
        enum {
                NO_CMD_PENDING,      /* no multiblock command pending*/
                MULTIBLK_IN_PROCESS, /* exact multiblock cmd in process */
                WAIT_FOR_INT,        /* sent CMD12, waiting for response INT */
        } multiblock_status;
        u32 is_ddr;
};

static const struct platform_device_id imx_esdhc_devtype[] = {
        {
                .name = "sdhci-esdhc-imx25",
                .driver_data = (kernel_ulong_t) &esdhc_imx25_data,
        }, {
                .name = "sdhci-esdhc-imx35",
                .driver_data = (kernel_ulong_t) &esdhc_imx35_data,
        }, {
                .name = "sdhci-esdhc-imx51",
                .driver_data = (kernel_ulong_t) &esdhc_imx51_data,
        }, {
                /* sentinel */
        }
};
MODULE_DEVICE_TABLE(platform, imx_esdhc_devtype);

static const struct of_device_id imx_esdhc_dt_ids[] = {
        { .compatible = "fsl,imx25-esdhc", .data = &esdhc_imx25_data, },
        { .compatible = "fsl,imx35-esdhc", .data = &esdhc_imx35_data, },
        { .compatible = "fsl,imx51-esdhc", .data = &esdhc_imx51_data, },
        { .compatible = "fsl,imx53-esdhc", .data = &esdhc_imx53_data, },
        { .compatible = "fsl,imx6sx-usdhc", .data = &usdhc_imx6sx_data, },
        { .compatible = "fsl,imx6sl-usdhc", .data = &usdhc_imx6sl_data, },
        { .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, },
        { .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids);

static inline int is_imx25_esdhc(struct pltfm_imx_data *data)
{
        return data->socdata == &esdhc_imx25_data;
}

static inline int is_imx53_esdhc(struct pltfm_imx_data *data)
{
        return data->socdata == &esdhc_imx53_data;
}

static inline int is_imx6q_usdhc(struct pltfm_imx_data *data)
{
        return data->socdata == &usdhc_imx6q_data;
}

static inline int esdhc_is_usdhc(struct pltfm_imx_data *data)
{
        return !!(data->socdata->flags & ESDHC_FLAG_USDHC);
}

static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, int reg)
{
        void __iomem *base = host->ioaddr + (reg & ~0x3);
        u32 shift = (reg & 0x3) * 8;

        writel(((readl(base) & ~(mask << shift)) | (val << shift)), base);
}

static u32 esdhc_readl_le(struct sdhci_host *host, int reg)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        u32 val = readl(host->ioaddr + reg);

        if (unlikely(reg == SDHCI_PRESENT_STATE)) {
                u32 fsl_prss = val;
                /* save the least 20 bits */
                val = fsl_prss & 0x000FFFFF;
                /* move dat[0-3] bits */
                val |= (fsl_prss & 0x0F000000) >> 4;
                /* move cmd line bit */
                val |= (fsl_prss & 0x00800000) << 1;
        }

        if (unlikely(reg == SDHCI_CAPABILITIES)) {
                /* ignore bit[0-15] as it stores cap_1 register val for mx6sl */
                if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
                        val &= 0xffff0000;

                /* In FSL esdhc IC module, only bit20 is used to indicate the
                 * ADMA2 capability of esdhc, but this bit is messed up on
                 * some SOCs (e.g. on MX25, MX35 this bit is set, but they
                 * don't actually support ADMA2). So set the BROKEN_ADMA
                 * uirk on MX25/35 platforms.
                 */

                if (val & SDHCI_CAN_DO_ADMA1) {
                        val &= ~SDHCI_CAN_DO_ADMA1;
                        val |= SDHCI_CAN_DO_ADMA2;
                }
        }

        if (unlikely(reg == SDHCI_CAPABILITIES_1)) {
                if (esdhc_is_usdhc(imx_data)) {
                        if (imx_data->socdata->flags & ESDHC_FLAG_HAVE_CAP1)
                                val = readl(host->ioaddr + SDHCI_CAPABILITIES) & 0xFFFF;
                        else
                                /* imx6q/dl does not have cap_1 register, fake one */
                                val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104
                                        | SDHCI_SUPPORT_SDR50
                                        | SDHCI_USE_SDR50_TUNING
                                        | (SDHCI_TUNING_MODE_3 << SDHCI_RETUNING_MODE_SHIFT);

                        if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
                                val |= SDHCI_SUPPORT_HS400;
                }
        }

        if (unlikely(reg == SDHCI_MAX_CURRENT) && esdhc_is_usdhc(imx_data)) {
                val = 0;
                val |= 0xFF << SDHCI_MAX_CURRENT_330_SHIFT;
                val |= 0xFF << SDHCI_MAX_CURRENT_300_SHIFT;
                val |= 0xFF << SDHCI_MAX_CURRENT_180_SHIFT;
        }

        if (unlikely(reg == SDHCI_INT_STATUS)) {
                if (val & ESDHC_INT_VENDOR_SPEC_DMA_ERR) {
                        val &= ~ESDHC_INT_VENDOR_SPEC_DMA_ERR;
                        val |= SDHCI_INT_ADMA_ERROR;
                }

                /*
                 * mask off the interrupt we get in response to the manually
                 * sent CMD12
                 */
                if ((imx_data->multiblock_status == WAIT_FOR_INT) &&
                    ((val & SDHCI_INT_RESPONSE) == SDHCI_INT_RESPONSE)) {
                        val &= ~SDHCI_INT_RESPONSE;
                        writel(SDHCI_INT_RESPONSE, host->ioaddr +
                                                   SDHCI_INT_STATUS);
                        imx_data->multiblock_status = NO_CMD_PENDING;
                }
        }

        return val;
}

static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        u32 data;

        if (unlikely(reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE ||
                        reg == SDHCI_INT_STATUS)) {
                if ((val & SDHCI_INT_CARD_INT) && !esdhc_is_usdhc(imx_data)) {
                        /*
                         * Clear and then set D3CD bit to avoid missing the
                         * card interrupt.  This is a eSDHC controller problem
                         * so we need to apply the following workaround: clear
                         * and set D3CD bit will make eSDHC re-sample the card
                         * interrupt. In case a card interrupt was lost,
                         * re-sample it by the following steps.
                         */
                        data = readl(host->ioaddr + SDHCI_HOST_CONTROL);
                        data &= ~ESDHC_CTRL_D3CD;
                        writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
                        data |= ESDHC_CTRL_D3CD;
                        writel(data, host->ioaddr + SDHCI_HOST_CONTROL);
                }

                if (val & SDHCI_INT_ADMA_ERROR) {
                        val &= ~SDHCI_INT_ADMA_ERROR;
                        val |= ESDHC_INT_VENDOR_SPEC_DMA_ERR;
                }
        }

        if (unlikely((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
                                && (reg == SDHCI_INT_STATUS)
                                && (val & SDHCI_INT_DATA_END))) {
                        u32 v;
                        v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
                        v &= ~ESDHC_VENDOR_SPEC_SDIO_QUIRK;
                        writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);

                        if (imx_data->multiblock_status == MULTIBLK_IN_PROCESS)
                        {
                                /* send a manual CMD12 with RESPTYP=none */
                                data = MMC_STOP_TRANSMISSION << 24 |
                                       SDHCI_CMD_ABORTCMD << 16;
                                writel(data, host->ioaddr + SDHCI_TRANSFER_MODE);
                                imx_data->multiblock_status = WAIT_FOR_INT;
                        }
        }

        writel(val, host->ioaddr + reg);
}

static u16 esdhc_readw_le(struct sdhci_host *host, int reg)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        u16 ret = 0;
        u32 val;

        if (unlikely(reg == SDHCI_HOST_VERSION)) {
                reg ^= 2;
                if (esdhc_is_usdhc(imx_data)) {
                        /*
                         * The usdhc register returns a wrong host version.
                         * Correct it here.
                         */
                        return SDHCI_SPEC_300;
                }
        }

        if (unlikely(reg == SDHCI_HOST_CONTROL2)) {
                val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
                if (val & ESDHC_VENDOR_SPEC_VSELECT)
                        ret |= SDHCI_CTRL_VDD_180;

                if (esdhc_is_usdhc(imx_data)) {
                        if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
                                val = readl(host->ioaddr + ESDHC_MIX_CTRL);
                        else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING)
                                /* the std tuning bits is in ACMD12_ERR for imx6sl */
                                val = readl(host->ioaddr + SDHCI_ACMD12_ERR);
                }

                if (val & ESDHC_MIX_CTRL_EXE_TUNE)
                        ret |= SDHCI_CTRL_EXEC_TUNING;
                if (val & ESDHC_MIX_CTRL_SMPCLK_SEL)
                        ret |= SDHCI_CTRL_TUNED_CLK;

                ret &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;

                return ret;
        }

        if (unlikely(reg == SDHCI_TRANSFER_MODE)) {
                if (esdhc_is_usdhc(imx_data)) {
                        u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
                        ret = m & ESDHC_MIX_CTRL_SDHCI_MASK;
                        /* Swap AC23 bit */
                        if (m & ESDHC_MIX_CTRL_AC23EN) {
                                ret &= ~ESDHC_MIX_CTRL_AC23EN;
                                ret |= SDHCI_TRNS_AUTO_CMD23;
                        }
                } else {
                        ret = readw(host->ioaddr + SDHCI_TRANSFER_MODE);
                }

                return ret;
        }

        return readw(host->ioaddr + reg);
}

static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        u32 new_val = 0;

        switch (reg) {
        case SDHCI_CLOCK_CONTROL:
                new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
                if (val & SDHCI_CLOCK_CARD_EN)
                        new_val |= ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
                else
                        new_val &= ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON;
                writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
                return;
        case SDHCI_HOST_CONTROL2:
                new_val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
                if (val & SDHCI_CTRL_VDD_180)
                        new_val |= ESDHC_VENDOR_SPEC_VSELECT;
                else
                        new_val &= ~ESDHC_VENDOR_SPEC_VSELECT;
                writel(new_val, host->ioaddr + ESDHC_VENDOR_SPEC);
                if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
                        new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
                        if (val & SDHCI_CTRL_TUNED_CLK) {
                                new_val |= ESDHC_MIX_CTRL_SMPCLK_SEL;
                                new_val |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
                        } else {
                                new_val &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
                                new_val &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
                        }
                        writel(new_val , host->ioaddr + ESDHC_MIX_CTRL);
                } else if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
                        u32 v = readl(host->ioaddr + SDHCI_ACMD12_ERR);
                        u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
                        if (val & SDHCI_CTRL_TUNED_CLK) {
                                v |= ESDHC_MIX_CTRL_SMPCLK_SEL;
                        } else {
                                v &= ~ESDHC_MIX_CTRL_SMPCLK_SEL;
                                m &= ~ESDHC_MIX_CTRL_FBCLK_SEL;
                                m &= ~ESDHC_MIX_CTRL_AUTO_TUNE_EN;
                        }

                        if (val & SDHCI_CTRL_EXEC_TUNING) {
                                v |= ESDHC_MIX_CTRL_EXE_TUNE;
                                m |= ESDHC_MIX_CTRL_FBCLK_SEL;
                                m |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
                        } else {
                                v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
                        }

                        writel(v, host->ioaddr + SDHCI_ACMD12_ERR);
                        writel(m, host->ioaddr + ESDHC_MIX_CTRL);
                }
                return;
        case SDHCI_TRANSFER_MODE:
                if ((imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT)
                                && (host->cmd->opcode == SD_IO_RW_EXTENDED)
                                && (host->cmd->data->blocks > 1)
                                && (host->cmd->data->flags & MMC_DATA_READ)) {
                        u32 v;
                        v = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
                        v |= ESDHC_VENDOR_SPEC_SDIO_QUIRK;
                        writel(v, host->ioaddr + ESDHC_VENDOR_SPEC);
                }

                if (esdhc_is_usdhc(imx_data)) {
                        u32 m = readl(host->ioaddr + ESDHC_MIX_CTRL);
                        /* Swap AC23 bit */
                        if (val & SDHCI_TRNS_AUTO_CMD23) {
                                val &= ~SDHCI_TRNS_AUTO_CMD23;
                                val |= ESDHC_MIX_CTRL_AC23EN;
                        }
                        m = val | (m & ~ESDHC_MIX_CTRL_SDHCI_MASK);
                        writel(m, host->ioaddr + ESDHC_MIX_CTRL);
                } else {
                        /*
                         * Postpone this write, we must do it together with a
                         * command write that is down below.
                         */
                        imx_data->scratchpad = val;
                }
                return;
        case SDHCI_COMMAND:
                if (host->cmd->opcode == MMC_STOP_TRANSMISSION)
                        val |= SDHCI_CMD_ABORTCMD;

                if ((host->cmd->opcode == MMC_SET_BLOCK_COUNT) &&
                    (imx_data->socdata->flags & ESDHC_FLAG_MULTIBLK_NO_INT))
                        imx_data->multiblock_status = MULTIBLK_IN_PROCESS;

                if (esdhc_is_usdhc(imx_data))
                        writel(val << 16,
                               host->ioaddr + SDHCI_TRANSFER_MODE);
                else
                        writel(val << 16 | imx_data->scratchpad,
                               host->ioaddr + SDHCI_TRANSFER_MODE);
                return;
        case SDHCI_BLOCK_SIZE:
                val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
                break;
        }
        esdhc_clrset_le(host, 0xffff, val, reg);
}

static u8 esdhc_readb_le(struct sdhci_host *host, int reg)
{
        u8 ret;
        u32 val;

        switch (reg) {
        case SDHCI_HOST_CONTROL:
                val = readl(host->ioaddr + reg);

                ret = val & SDHCI_CTRL_LED;
                ret |= (val >> 5) & SDHCI_CTRL_DMA_MASK;
                ret |= (val & ESDHC_CTRL_4BITBUS);
                ret |= (val & ESDHC_CTRL_8BITBUS) << 3;
                return ret;
        }

        return readb(host->ioaddr + reg);
}

static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        u32 new_val;
        u32 mask;

        switch (reg) {
        case SDHCI_POWER_CONTROL:
                /*
                 * FSL put some DMA bits here
                 * If your board has a regulator, code should be here
                 */
                return;
        case SDHCI_HOST_CONTROL:
                /* FSL messed up here, so we need to manually compose it. */
                new_val = val & SDHCI_CTRL_LED;
                /* ensure the endianness */
                new_val |= ESDHC_HOST_CONTROL_LE;
                /* bits 8&9 are reserved on mx25 */
                if (!is_imx25_esdhc(imx_data)) {
                        /* DMA mode bits are shifted */
                        new_val |= (val & SDHCI_CTRL_DMA_MASK) << 5;
                }

                /*
                 * Do not touch buswidth bits here. This is done in
                 * esdhc_pltfm_bus_width.
                 * Do not touch the D3CD bit either which is used for the
                 * SDIO interrupt errata workaround.
                 */
                mask = 0xffff & ~(ESDHC_CTRL_BUSWIDTH_MASK | ESDHC_CTRL_D3CD);

                esdhc_clrset_le(host, mask, new_val, reg);
                return;
        }
        esdhc_clrset_le(host, 0xff, val, reg);

        /*
         * The esdhc has a design violation to SDHC spec which tells
         * that software reset should not affect card detection circuit.
         * But esdhc clears its SYSCTL register bits [0..2] during the
         * software reset.  This will stop those clocks that card detection
         * circuit relies on.  To work around it, we turn the clocks on back
         * to keep card detection circuit functional.
         */
        if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1)) {
                esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL);
                /*
                 * The reset on usdhc fails to clear MIX_CTRL register.
                 * Do it manually here.
                 */
                if (esdhc_is_usdhc(imx_data)) {
                        /* the tuning bits should be kept during reset */
                        new_val = readl(host->ioaddr + ESDHC_MIX_CTRL);
                        writel(new_val & ESDHC_MIX_CTRL_TUNING_MASK,
                                        host->ioaddr + ESDHC_MIX_CTRL);
                        imx_data->is_ddr = 0;
                }
        }
}

static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

        return pltfm_host->clock;
}

static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

        return pltfm_host->clock / 256 / 16;
}

static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
                                         unsigned int clock)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        unsigned int host_clock = pltfm_host->clock;
        int pre_div = 2;
        int div = 1;
        u32 temp, val;

        if (clock == 0) {
                host->mmc->actual_clock = 0;

                if (esdhc_is_usdhc(imx_data)) {
                        val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
                        writel(val & ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
                                        host->ioaddr + ESDHC_VENDOR_SPEC);
                }
                return;
        }

        if (esdhc_is_usdhc(imx_data) && !imx_data->is_ddr)
                pre_div = 1;

        temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
        temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
                | ESDHC_CLOCK_MASK);
        sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);

        while (host_clock / pre_div / 16 > clock && pre_div < 256)
                pre_div *= 2;

        while (host_clock / pre_div / div > clock && div < 16)
                div++;

        host->mmc->actual_clock = host_clock / pre_div / div;
        dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
                clock, host->mmc->actual_clock);

        if (imx_data->is_ddr)
                pre_div >>= 2;
        else
                pre_div >>= 1;
        div--;

        temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
        temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
                | (div << ESDHC_DIVIDER_SHIFT)
                | (pre_div << ESDHC_PREDIV_SHIFT));
        sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);

        if (esdhc_is_usdhc(imx_data)) {
                val = readl(host->ioaddr + ESDHC_VENDOR_SPEC);
                writel(val | ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
                host->ioaddr + ESDHC_VENDOR_SPEC);
        }

        mdelay(1);
}

static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        struct esdhc_platform_data *boarddata = &imx_data->boarddata;

        switch (boarddata->wp_type) {
        case ESDHC_WP_GPIO:
                return mmc_gpio_get_ro(host->mmc);
        case ESDHC_WP_CONTROLLER:
                return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
                               SDHCI_WRITE_PROTECT);
        case ESDHC_WP_NONE:
                break;
        }

        return -ENOSYS;
}

static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
{
        u32 ctrl;

        switch (width) {
        case MMC_BUS_WIDTH_8:
                ctrl = ESDHC_CTRL_8BITBUS;
                break;
        case MMC_BUS_WIDTH_4:
                ctrl = ESDHC_CTRL_4BITBUS;
                break;
        default:
                ctrl = 0;
                break;
        }

        esdhc_clrset_le(host, ESDHC_CTRL_BUSWIDTH_MASK, ctrl,
                        SDHCI_HOST_CONTROL);
}

static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
{
        u32 reg;

        /* FIXME: delay a bit for card to be ready for next tuning due to errors */
        mdelay(1);

        reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
        reg |= ESDHC_MIX_CTRL_EXE_TUNE | ESDHC_MIX_CTRL_SMPCLK_SEL |
                        ESDHC_MIX_CTRL_FBCLK_SEL;
        writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
        writel(val << 8, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
        dev_dbg(mmc_dev(host->mmc),
                "tunning with delay 0x%x ESDHC_TUNE_CTRL_STATUS 0x%x\n",
                        val, readl(host->ioaddr + ESDHC_TUNE_CTRL_STATUS));
}

static void esdhc_post_tuning(struct sdhci_host *host)
{
        u32 reg;

        reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
        reg &= ~ESDHC_MIX_CTRL_EXE_TUNE;
        reg |= ESDHC_MIX_CTRL_AUTO_TUNE_EN;
        writel(reg, host->ioaddr + ESDHC_MIX_CTRL);
}

static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
{
        int min, max, avg, ret;

        /* find the mininum delay first which can pass tuning */
        min = ESDHC_TUNE_CTRL_MIN;
        while (min < ESDHC_TUNE_CTRL_MAX) {
                esdhc_prepare_tuning(host, min);
                if (!mmc_send_tuning(host->mmc, opcode, NULL))
                        break;
                min += ESDHC_TUNE_CTRL_STEP;
        }

        /* find the maxinum delay which can not pass tuning */
        max = min + ESDHC_TUNE_CTRL_STEP;
        while (max < ESDHC_TUNE_CTRL_MAX) {
                esdhc_prepare_tuning(host, max);
                if (mmc_send_tuning(host->mmc, opcode, NULL)) {
                        max -= ESDHC_TUNE_CTRL_STEP;
                        break;
                }
                max += ESDHC_TUNE_CTRL_STEP;
        }

        /* use average delay to get the best timing */
        avg = (min + max) / 2;
        esdhc_prepare_tuning(host, avg);
        ret = mmc_send_tuning(host->mmc, opcode, NULL);
        esdhc_post_tuning(host);

        dev_dbg(mmc_dev(host->mmc), "tunning %s at 0x%x ret %d\n",
                ret ? "failed" : "passed", avg, ret);

        return ret;
}

static int esdhc_change_pinstate(struct sdhci_host *host,
                                                unsigned int uhs)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        struct pinctrl_state *pinctrl;

        dev_dbg(mmc_dev(host->mmc), "change pinctrl state for uhs %d\n", uhs);

        if (IS_ERR(imx_data->pinctrl) ||
                IS_ERR(imx_data->pins_default) ||
                IS_ERR(imx_data->pins_100mhz) ||
                IS_ERR(imx_data->pins_200mhz))
                return -EINVAL;

        switch (uhs) {
        case MMC_TIMING_UHS_SDR50:
                pinctrl = imx_data->pins_100mhz;
                break;
        case MMC_TIMING_UHS_SDR104:
        case MMC_TIMING_MMC_HS200:
        case MMC_TIMING_MMC_HS400:
                pinctrl = imx_data->pins_200mhz;
                break;
        default:
                /* back to default state for other legacy timing */
                pinctrl = imx_data->pins_default;
        }

        return pinctrl_select_state(imx_data->pinctrl, pinctrl);
}

/*
 * For HS400 eMMC, there is a data_strobe line, this signal is generated
 * by the device and used for data output and CRC status response output
 * in HS400 mode. The frequency of this signal follows the frequency of
 * CLK generated by host. Host receive the data which is aligned to the
 * edge of data_strobe line. Due to the time delay between CLK line and
 * data_strobe line, if the delay time is larger than one clock cycle,
 * then CLK and data_strobe line will misaligned, read error shows up.
 * So when the CLK is higher than 100MHz, each clock cycle is short enough,
 * host should config the delay target.
 */
static void esdhc_set_strobe_dll(struct sdhci_host *host)
{
        u32 v;

        if (host->mmc->actual_clock > ESDHC_STROBE_DLL_CLK_FREQ) {
                /* disable clock before enabling strobe dll */
                writel(readl(host->ioaddr + ESDHC_VENDOR_SPEC) &
                       ~ESDHC_VENDOR_SPEC_FRC_SDCLK_ON,
                       host->ioaddr + ESDHC_VENDOR_SPEC);

                /* force a reset on strobe dll */
                writel(ESDHC_STROBE_DLL_CTRL_RESET,
                        host->ioaddr + ESDHC_STROBE_DLL_CTRL);
                /*
                 * enable strobe dll ctrl and adjust the delay target
                 * for the uSDHC loopback read clock
                 */
                v = ESDHC_STROBE_DLL_CTRL_ENABLE |
                        (7 << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT);
                writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL);
                /* wait 1us to make sure strobe dll status register stable */
                udelay(1);
                v = readl(host->ioaddr + ESDHC_STROBE_DLL_STATUS);
                if (!(v & ESDHC_STROBE_DLL_STS_REF_LOCK))
                        dev_warn(mmc_dev(host->mmc),
                                "warning! HS400 strobe DLL status REF not lock!\n");
                if (!(v & ESDHC_STROBE_DLL_STS_SLV_LOCK))
                        dev_warn(mmc_dev(host->mmc),
                                "warning! HS400 strobe DLL status SLV not lock!\n");
        }
}

static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
{
        u32 m;
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        struct esdhc_platform_data *boarddata = &imx_data->boarddata;

        /* disable ddr mode and disable HS400 mode */
        m = readl(host->ioaddr + ESDHC_MIX_CTRL);
        m &= ~(ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN);
        imx_data->is_ddr = 0;

        switch (timing) {
        case MMC_TIMING_UHS_SDR12:
        case MMC_TIMING_UHS_SDR25:
        case MMC_TIMING_UHS_SDR50:
        case MMC_TIMING_UHS_SDR104:
        case MMC_TIMING_MMC_HS200:
                writel(m, host->ioaddr + ESDHC_MIX_CTRL);
                break;
        case MMC_TIMING_UHS_DDR50:
        case MMC_TIMING_MMC_DDR52:
                m |= ESDHC_MIX_CTRL_DDREN;
                writel(m, host->ioaddr + ESDHC_MIX_CTRL);
                imx_data->is_ddr = 1;
                if (boarddata->delay_line) {
                        u32 v;
                        v = boarddata->delay_line <<
                                ESDHC_DLL_OVERRIDE_VAL_SHIFT |
                                (1 << ESDHC_DLL_OVERRIDE_EN_SHIFT);
                        if (is_imx53_esdhc(imx_data))
                                v <<= 1;
                        writel(v, host->ioaddr + ESDHC_DLL_CTRL);
                }
                break;
        case MMC_TIMING_MMC_HS400:
                m |= ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN;
                writel(m, host->ioaddr + ESDHC_MIX_CTRL);
                imx_data->is_ddr = 1;
                /* update clock after enable DDR for strobe DLL lock */
                host->ops->set_clock(host, host->clock);
                esdhc_set_strobe_dll(host);
                break;
        }

        esdhc_change_pinstate(host, timing);
}

static void esdhc_reset(struct sdhci_host *host, u8 mask)
{
        sdhci_reset(host, mask);

        sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
        sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
}

static unsigned int esdhc_get_max_timeout_count(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);

        /* Doc Errata: the uSDHC actual maximum timeout count is 1 << 29 */
        return esdhc_is_usdhc(imx_data) ? 1 << 29 : 1 << 27;
}

static void esdhc_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);

        /* use maximum timeout counter */
        esdhc_clrset_le(host, ESDHC_SYS_CTRL_DTOCV_MASK,
                        esdhc_is_usdhc(imx_data) ? 0xF : 0xE,
                        SDHCI_TIMEOUT_CONTROL);
}

static struct sdhci_ops sdhci_esdhc_ops = {
        .read_l = esdhc_readl_le,
        .read_w = esdhc_readw_le,
        .read_b = esdhc_readb_le,
        .write_l = esdhc_writel_le,
        .write_w = esdhc_writew_le,
        .write_b = esdhc_writeb_le,
        .set_clock = esdhc_pltfm_set_clock,
        .get_max_clock = esdhc_pltfm_get_max_clock,
        .get_min_clock = esdhc_pltfm_get_min_clock,
        .get_max_timeout_count = esdhc_get_max_timeout_count,
        .get_ro = esdhc_pltfm_get_ro,
        .set_timeout = esdhc_set_timeout,
        .set_bus_width = esdhc_pltfm_set_bus_width,
        .set_uhs_signaling = esdhc_set_uhs_signaling,
        .reset = esdhc_reset,
};

static const struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
        .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_NO_HISPD_BIT
                        | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
                        | SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC
                        | SDHCI_QUIRK_BROKEN_CARD_DETECTION,
        .ops = &sdhci_esdhc_ops,
};

static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
{
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        int tmp;

        if (esdhc_is_usdhc(imx_data)) {
                /*
                 * The imx6q ROM code will change the default watermark
                 * level setting to something insane.  Change it back here.
                 */
                writel(ESDHC_WTMK_DEFAULT_VAL, host->ioaddr + ESDHC_WTMK_LVL);

                /*
                 * ROM code will change the bit burst_length_enable setting
                 * to zero if this usdhc is choosed to boot system. Change
                 * it back here, otherwise it will impact the performance a
                 * lot. This bit is used to enable/disable the burst length
                 * for the external AHB2AXI bridge, it's usefully especially
                 * for INCR transfer because without burst length indicator,
                 * the AHB2AXI bridge does not know the burst length in
                 * advance. And without burst length indicator, AHB INCR
                 * transfer can only be converted to singles on the AXI side.
                 */
                writel(readl(host->ioaddr + SDHCI_HOST_CONTROL)
                        | ESDHC_BURST_LEN_EN_INCR,
                        host->ioaddr + SDHCI_HOST_CONTROL);
                /*
                * errata ESDHC_FLAG_ERR004536 fix for MX6Q TO1.2 and MX6DL
                * TO1.1, it's harmless for MX6SL
                */
                writel(readl(host->ioaddr + 0x6c) | BIT(7),
                        host->ioaddr + 0x6c);

                /* disable DLL_CTRL delay line settings */
                writel(0x0, host->ioaddr + ESDHC_DLL_CTRL);

                if (imx_data->socdata->flags & ESDHC_FLAG_STD_TUNING) {
                        tmp = readl(host->ioaddr + ESDHC_TUNING_CTRL);
                        tmp |= ESDHC_STD_TUNING_EN |
                                ESDHC_TUNING_START_TAP_DEFAULT;
                        if (imx_data->boarddata.tuning_start_tap) {
                                tmp &= ~ESDHC_TUNING_START_TAP_MASK;
                                tmp |= imx_data->boarddata.tuning_start_tap;
                        }

                        if (imx_data->boarddata.tuning_step) {
                                tmp &= ~ESDHC_TUNING_STEP_MASK;
                                tmp |= imx_data->boarddata.tuning_step
                                        << ESDHC_TUNING_STEP_SHIFT;
                        }
                        writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
                }
        }
}

#ifdef CONFIG_OF
static int
sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
                         struct sdhci_host *host,
                         struct pltfm_imx_data *imx_data)
{
        struct device_node *np = pdev->dev.of_node;
        struct esdhc_platform_data *boarddata = &imx_data->boarddata;
        int ret;

        if (of_get_property(np, "fsl,wp-controller", NULL))
                boarddata->wp_type = ESDHC_WP_CONTROLLER;

        boarddata->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
        if (gpio_is_valid(boarddata->wp_gpio))
                boarddata->wp_type = ESDHC_WP_GPIO;

        of_property_read_u32(np, "fsl,tuning-step", &boarddata->tuning_step);
        of_property_read_u32(np, "fsl,tuning-start-tap",
                             &boarddata->tuning_start_tap);

        if (of_find_property(np, "no-1-8-v", NULL))
                boarddata->support_vsel = false;
        else
                boarddata->support_vsel = true;

        if (of_property_read_u32(np, "fsl,delay-line", &boarddata->delay_line))
                boarddata->delay_line = 0;

        mmc_of_parse_voltage(np, &host->ocr_mask);

        /* sdr50 and sdr104 needs work on 1.8v signal voltage */
        if ((boarddata->support_vsel) && esdhc_is_usdhc(imx_data) &&
            !IS_ERR(imx_data->pins_default)) {
                imx_data->pins_100mhz = pinctrl_lookup_state(imx_data->pinctrl,
                                                ESDHC_PINCTRL_STATE_100MHZ);
                imx_data->pins_200mhz = pinctrl_lookup_state(imx_data->pinctrl,
                                                ESDHC_PINCTRL_STATE_200MHZ);
                if (IS_ERR(imx_data->pins_100mhz) ||
                                IS_ERR(imx_data->pins_200mhz)) {
                        dev_warn(mmc_dev(host->mmc),
                                "could not get ultra high speed state, work on normal mode\n");
                        /*
                         * fall back to not support uhs by specify no 1.8v quirk
                         */
                        host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
                }
        } else {
                host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
        }

        /* call to generic mmc_of_parse to support additional capabilities */
        ret = mmc_of_parse(host->mmc);
        if (ret)
                return ret;

        if (mmc_gpio_get_cd(host->mmc) >= 0)
                host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;

        return 0;
}
#else
static inline int
sdhci_esdhc_imx_probe_dt(struct platform_device *pdev,
                         struct sdhci_host *host,
                         struct pltfm_imx_data *imx_data)
{
        return -ENODEV;
}
#endif

static int sdhci_esdhc_imx_probe_nondt(struct platform_device *pdev,
                         struct sdhci_host *host,
                         struct pltfm_imx_data *imx_data)
{
        struct esdhc_platform_data *boarddata = &imx_data->boarddata;
        int err;

        if (!host->mmc->parent->platform_data) {
                dev_err(mmc_dev(host->mmc), "no board data!\n");
                return -EINVAL;
        }

        imx_data->boarddata = *((struct esdhc_platform_data *)
                                host->mmc->parent->platform_data);
        /* write_protect */
        if (boarddata->wp_type == ESDHC_WP_GPIO) {
                err = mmc_gpio_request_ro(host->mmc, boarddata->wp_gpio);
                if (err) {
                        dev_err(mmc_dev(host->mmc),
                                "failed to request write-protect gpio!\n");
                        return err;
                }
                host->mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
        }

        /* card_detect */
        switch (boarddata->cd_type) {
        case ESDHC_CD_GPIO:
                err = mmc_gpio_request_cd(host->mmc, boarddata->cd_gpio, 0);
                if (err) {
                        dev_err(mmc_dev(host->mmc),
                                "failed to request card-detect gpio!\n");
                        return err;
                }
                /* fall through */

        case ESDHC_CD_CONTROLLER:
                /* we have a working card_detect back */
                host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
                break;

        case ESDHC_CD_PERMANENT:
                host->mmc->caps |= MMC_CAP_NONREMOVABLE;
                break;

        case ESDHC_CD_NONE:
                break;
        }

        switch (boarddata->max_bus_width) {
        case 8:
                host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA;
                break;
        case 4:
                host->mmc->caps |= MMC_CAP_4_BIT_DATA;
                break;
        case 1:
        default:
                host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
                break;
        }

        return 0;
}

static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
{
        const struct of_device_id *of_id =
                        of_match_device(imx_esdhc_dt_ids, &pdev->dev);
        struct sdhci_pltfm_host *pltfm_host;
        struct sdhci_host *host;
        int err;
        struct pltfm_imx_data *imx_data;

        host = sdhci_pltfm_init(pdev, &sdhci_esdhc_imx_pdata,
                                sizeof(*imx_data));
        if (IS_ERR(host))
                return PTR_ERR(host);

        pltfm_host = sdhci_priv(host);

        imx_data = sdhci_pltfm_priv(pltfm_host);

        imx_data->socdata = of_id ? of_id->data : (struct esdhc_soc_data *)
                                                  pdev->id_entry->driver_data;

        imx_data->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
        if (IS_ERR(imx_data->clk_ipg)) {
                err = PTR_ERR(imx_data->clk_ipg);
                goto free_sdhci;
        }

        imx_data->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
        if (IS_ERR(imx_data->clk_ahb)) {
                err = PTR_ERR(imx_data->clk_ahb);
                goto free_sdhci;
        }

        imx_data->clk_per = devm_clk_get(&pdev->dev, "per");
        if (IS_ERR(imx_data->clk_per)) {
                err = PTR_ERR(imx_data->clk_per);
                goto free_sdhci;
        }

        pltfm_host->clk = imx_data->clk_per;
        pltfm_host->clock = clk_get_rate(pltfm_host->clk);
        clk_prepare_enable(imx_data->clk_per);
        clk_prepare_enable(imx_data->clk_ipg);
        clk_prepare_enable(imx_data->clk_ahb);

        imx_data->pinctrl = devm_pinctrl_get(&pdev->dev);
        if (IS_ERR(imx_data->pinctrl)) {
                err = PTR_ERR(imx_data->pinctrl);
                goto disable_clk;
        }

        imx_data->pins_default = pinctrl_lookup_state(imx_data->pinctrl,
                                                PINCTRL_STATE_DEFAULT);
        if (IS_ERR(imx_data->pins_default))
                dev_warn(mmc_dev(host->mmc), "could not get default state\n");

        if (imx_data->socdata->flags & ESDHC_FLAG_ENGCM07207)
                /* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */
                host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK
                        | SDHCI_QUIRK_BROKEN_ADMA;

        if (esdhc_is_usdhc(imx_data)) {
                host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
                host->mmc->caps |= MMC_CAP_1_8V_DDR;
                if (!(imx_data->socdata->flags & ESDHC_FLAG_HS200))
                        host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;

                /* clear tuning bits in case ROM has set it already */
                writel(0x0, host->ioaddr + ESDHC_MIX_CTRL);
                writel(0x0, host->ioaddr + SDHCI_ACMD12_ERR);
                writel(0x0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS);
        }

        if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)
                sdhci_esdhc_ops.platform_execute_tuning =
                                        esdhc_executing_tuning;

        if (imx_data->socdata->flags & ESDHC_FLAG_ERR004536)
                host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;

        if (imx_data->socdata->flags & ESDHC_FLAG_HS400)
                host->quirks2 |= SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400;

        if (of_id)
                err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);
        else
                err = sdhci_esdhc_imx_probe_nondt(pdev, host, imx_data);
        if (err)
                goto disable_clk;

        sdhci_esdhc_imx_hwinit(host);

        err = sdhci_add_host(host);
        if (err)
                goto disable_clk;

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

        return 0;

disable_clk:
        clk_disable_unprepare(imx_data->clk_per);
        clk_disable_unprepare(imx_data->clk_ipg);
        clk_disable_unprepare(imx_data->clk_ahb);
free_sdhci:
        sdhci_pltfm_free(pdev);
        return err;
}

static int sdhci_esdhc_imx_remove(struct platform_device *pdev)
{
        struct sdhci_host *host = platform_get_drvdata(pdev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);

        pm_runtime_get_sync(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
        pm_runtime_put_noidle(&pdev->dev);

        sdhci_remove_host(host, dead);

        clk_disable_unprepare(imx_data->clk_per);
        clk_disable_unprepare(imx_data->clk_ipg);
        clk_disable_unprepare(imx_data->clk_ahb);

        sdhci_pltfm_free(pdev);

        return 0;
}

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

        return sdhci_suspend_host(host);
}

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

        /* re-initialize hw state in case it's lost in low power mode */
        sdhci_esdhc_imx_hwinit(host);

        return sdhci_resume_host(host);
}
#endif

#ifdef CONFIG_PM
static int sdhci_esdhc_runtime_suspend(struct device *dev)
{
        struct sdhci_host *host = dev_get_drvdata(dev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
        int ret;

        ret = sdhci_runtime_suspend_host(host);

        if (!sdhci_sdio_irq_enabled(host)) {
                clk_disable_unprepare(imx_data->clk_per);
                clk_disable_unprepare(imx_data->clk_ipg);
        }
        clk_disable_unprepare(imx_data->clk_ahb);

        return ret;
}

static int sdhci_esdhc_runtime_resume(struct device *dev)
{
        struct sdhci_host *host = dev_get_drvdata(dev);
        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
        struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);

        if (!sdhci_sdio_irq_enabled(host)) {
                clk_prepare_enable(imx_data->clk_per);
                clk_prepare_enable(imx_data->clk_ipg);
        }
        clk_prepare_enable(imx_data->clk_ahb);

        return sdhci_runtime_resume_host(host);
}
#endif

static const struct dev_pm_ops sdhci_esdhc_pmops = {
        SET_SYSTEM_SLEEP_PM_OPS(sdhci_esdhc_suspend, sdhci_esdhc_resume)
        SET_RUNTIME_PM_OPS(sdhci_esdhc_runtime_suspend,
                                sdhci_esdhc_runtime_resume, NULL)
};

static struct platform_driver sdhci_esdhc_imx_driver = {
        .driver         = {
                .name   = "sdhci-esdhc-imx",
                .of_match_table = imx_esdhc_dt_ids,
                .pm     = &sdhci_esdhc_pmops,
        },
        .id_table       = imx_esdhc_devtype,
        .probe          = sdhci_esdhc_imx_probe,
        .remove         = sdhci_esdhc_imx_remove,
};

module_platform_driver(sdhci_esdhc_imx_driver);

MODULE_DESCRIPTION("SDHCI driver for Freescale i.MX eSDHC");
MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
MODULE_LICENSE("GPL v2");