// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2008, Freescale Semiconductor, Inc
 * Copyright 2020 NXP
 * Andy Fleming
 *
 * Based vaguely on the Linux code
 */

#include <config.h>
#include <common.h>
#include <blk.h>
#include <command.h>
#include <dm.h>
#include <log.h>
#include <dm/device-internal.h>
#include <errno.h>
#include <mmc.h>
#include <part.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <power/regulator.h>
#include <malloc.h>
#include <memalign.h>
#include <linux/list.h>
#include <div64.h>
#include "mmc_private.h"

#define DEFAULT_CMD6_TIMEOUT_MS  500

static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage);

#if !CONFIG_IS_ENABLED(DM_MMC)

static int mmc_wait_dat0(struct mmc *mmc, int state, int timeout_us)
{
        return -ENOSYS;
}

__weak int board_mmc_getwp(struct mmc *mmc)
{
        return -1;
}

int mmc_getwp(struct mmc *mmc)
{
        int wp;

        wp = board_mmc_getwp(mmc);

        if (wp < 0) {
                if (mmc->cfg->ops->getwp)
                        wp = mmc->cfg->ops->getwp(mmc);
                else
                        wp = 0;
        }

        return wp;
}

__weak int board_mmc_getcd(struct mmc *mmc)
{
        return -1;
}
#endif

#ifdef CONFIG_MMC_TRACE
void mmmc_trace_before_send(struct mmc *mmc, struct mmc_cmd *cmd)
{
        printf("CMD_SEND:%d\n", cmd->cmdidx);
        printf("\t\tARG\t\t\t 0x%08x\n", cmd->cmdarg);
}

void mmmc_trace_after_send(struct mmc *mmc, struct mmc_cmd *cmd, int ret)
{
        int i;
        u8 *ptr;

        if (ret) {
                printf("\t\tRET\t\t\t %d\n", ret);
        } else {
                switch (cmd->resp_type) {
                case MMC_RSP_NONE:
                        printf("\t\tMMC_RSP_NONE\n");
                        break;
                case MMC_RSP_R1:
                        printf("\t\tMMC_RSP_R1,5,6,7 \t 0x%08x \n",
                                cmd->response[0]);
                        break;
                case MMC_RSP_R1b:
                        printf("\t\tMMC_RSP_R1b\t\t 0x%08x \n",
                                cmd->response[0]);
                        break;
                case MMC_RSP_R2:
                        printf("\t\tMMC_RSP_R2\t\t 0x%08x \n",
                                cmd->response[0]);
                        printf("\t\t          \t\t 0x%08x \n",
                                cmd->response[1]);
                        printf("\t\t          \t\t 0x%08x \n",
                                cmd->response[2]);
                        printf("\t\t          \t\t 0x%08x \n",
                                cmd->response[3]);
                        printf("\n");
                        printf("\t\t\t\t\tDUMPING DATA\n");
                        for (i = 0; i < 4; i++) {
                                int j;
                                printf("\t\t\t\t\t%03d - ", i*4);
                                ptr = (u8 *)&cmd->response[i];
                                ptr += 3;
                                for (j = 0; j < 4; j++)
                                        printf("%02x ", *ptr--);
                                printf("\n");
                        }
                        break;
                case MMC_RSP_R3:
                        printf("\t\tMMC_RSP_R3,4\t\t 0x%08x \n",
                                cmd->response[0]);
                        break;
                default:
                        printf("\t\tERROR MMC rsp not supported\n");
                        break;
                }
        }
}

void mmc_trace_state(struct mmc *mmc, struct mmc_cmd *cmd)
{
        int status;

        status = (cmd->response[0] & MMC_STATUS_CURR_STATE) >> 9;
        printf("CURR STATE:%d\n", status);
}
#endif

#if CONFIG_IS_ENABLED(MMC_VERBOSE) || defined(DEBUG)
const char *mmc_mode_name(enum bus_mode mode)
{
        static const char *const names[] = {
              [MMC_LEGACY]      = "MMC legacy",
              [MMC_HS]          = "MMC High Speed (26MHz)",
              [SD_HS]           = "SD High Speed (50MHz)",
              [UHS_SDR12]       = "UHS SDR12 (25MHz)",
              [UHS_SDR25]       = "UHS SDR25 (50MHz)",
              [UHS_SDR50]       = "UHS SDR50 (100MHz)",
              [UHS_SDR104]      = "UHS SDR104 (208MHz)",
              [UHS_DDR50]       = "UHS DDR50 (50MHz)",
              [MMC_HS_52]       = "MMC High Speed (52MHz)",
              [MMC_DDR_52]      = "MMC DDR52 (52MHz)",
              [MMC_HS_200]      = "HS200 (200MHz)",
              [MMC_HS_400]      = "HS400 (200MHz)",
              [MMC_HS_400_ES]   = "HS400ES (200MHz)",
        };

        if (mode >= MMC_MODES_END)
                return "Unknown mode";
        else
                return names[mode];
}
#endif

static uint mmc_mode2freq(struct mmc *mmc, enum bus_mode mode)
{
        static const int freqs[] = {
              [MMC_LEGACY]      = 25000000,
              [MMC_HS]          = 26000000,
              [SD_HS]           = 50000000,
              [MMC_HS_52]       = 52000000,
              [MMC_DDR_52]      = 52000000,
              [UHS_SDR12]       = 25000000,
              [UHS_SDR25]       = 50000000,
              [UHS_SDR50]       = 100000000,
              [UHS_DDR50]       = 50000000,
              [UHS_SDR104]      = 208000000,
              [MMC_HS_200]      = 200000000,
              [MMC_HS_400]      = 200000000,
              [MMC_HS_400_ES]   = 200000000,
        };

        if (mode == MMC_LEGACY)
                return mmc->legacy_speed;
        else if (mode >= MMC_MODES_END)
                return 0;
        else
                return freqs[mode];
}

static int mmc_select_mode(struct mmc *mmc, enum bus_mode mode)
{
        mmc->selected_mode = mode;
        mmc->tran_speed = mmc_mode2freq(mmc, mode);
        mmc->ddr_mode = mmc_is_mode_ddr(mode);
        pr_debug("selecting mode %s (freq : %d MHz)\n", mmc_mode_name(mode),
                 mmc->tran_speed / 1000000);
        return 0;
}

#if !CONFIG_IS_ENABLED(DM_MMC)
int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
        int ret;

        mmmc_trace_before_send(mmc, cmd);
        ret = mmc->cfg->ops->send_cmd(mmc, cmd, data);
        mmmc_trace_after_send(mmc, cmd, ret);

        return ret;
}
#endif

/**
 * mmc_send_cmd_retry() - send a command to the mmc device, retrying on error
 *
 * @dev:        device to receive the command
 * @cmd:        command to send
 * @data:       additional data to send/receive
 * @retries:    how many times to retry; mmc_send_cmd is always called at least
 *              once
 * @return 0 if ok, -ve on error
 */
static int mmc_send_cmd_retry(struct mmc *mmc, struct mmc_cmd *cmd,
                              struct mmc_data *data, uint retries)
{
        int ret;

        do {
                ret = mmc_send_cmd(mmc, cmd, data);
        } while (ret && retries--);

        return ret;
}

/**
 * mmc_send_cmd_quirks() - send a command to the mmc device, retrying if a
 *                         specific quirk is enabled
 *
 * @dev:        device to receive the command
 * @cmd:        command to send
 * @data:       additional data to send/receive
 * @quirk:      retry only if this quirk is enabled
 * @retries:    how many times to retry; mmc_send_cmd is always called at least
 *              once
 * @return 0 if ok, -ve on error
 */
static int mmc_send_cmd_quirks(struct mmc *mmc, struct mmc_cmd *cmd,
                               struct mmc_data *data, u32 quirk, uint retries)
{
        if (CONFIG_IS_ENABLED(MMC_QUIRKS) && mmc->quirks & quirk)
                return mmc_send_cmd_retry(mmc, cmd, data, retries);
        else
                return mmc_send_cmd(mmc, cmd, data);
}

int mmc_send_status(struct mmc *mmc, unsigned int *status)
{
        struct mmc_cmd cmd;
        int ret;

        cmd.cmdidx = MMC_CMD_SEND_STATUS;
        cmd.resp_type = MMC_RSP_R1;
        if (!mmc_host_is_spi(mmc))
                cmd.cmdarg = mmc->rca << 16;

        ret = mmc_send_cmd_retry(mmc, &cmd, NULL, 4);
        mmc_trace_state(mmc, &cmd);
        if (!ret)
                *status = cmd.response[0];

        return ret;
}

int mmc_poll_for_busy(struct mmc *mmc, int timeout_ms)
{
        unsigned int status;
        int err;

        err = mmc_wait_dat0(mmc, 1, timeout_ms * 1000);
        if (err != -ENOSYS)
                return err;

        while (1) {
                err = mmc_send_status(mmc, &status);
                if (err)
                        return err;

                if ((status & MMC_STATUS_RDY_FOR_DATA) &&
                    (status & MMC_STATUS_CURR_STATE) !=
                     MMC_STATE_PRG)
                        break;

                if (status & MMC_STATUS_MASK) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
                        pr_err("Status Error: 0x%08x\n", status);
#endif
                        return -ECOMM;
                }

                if (timeout_ms-- <= 0)
                        break;

                udelay(1000);
        }

        if (timeout_ms <= 0) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
                pr_err("Timeout waiting card ready\n");
#endif
                return -ETIMEDOUT;
        }

        return 0;
}

int mmc_set_blocklen(struct mmc *mmc, int len)
{
        struct mmc_cmd cmd;

        if (mmc->ddr_mode)
                return 0;

        cmd.cmdidx = MMC_CMD_SET_BLOCKLEN;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = len;

        return mmc_send_cmd_quirks(mmc, &cmd, NULL,
                                   MMC_QUIRK_RETRY_SET_BLOCKLEN, 4);
}

#ifdef MMC_SUPPORTS_TUNING
static const u8 tuning_blk_pattern_4bit[] = {
        0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
        0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
        0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
        0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
        0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
        0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
        0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
        0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
};

static const u8 tuning_blk_pattern_8bit[] = {
        0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
        0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
        0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
        0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
        0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
        0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
        0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
        0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
        0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
        0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
        0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
        0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
        0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
        0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
        0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
        0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
};

int mmc_send_tuning(struct mmc *mmc, u32 opcode, int *cmd_error)
{
        struct mmc_cmd cmd;
        struct mmc_data data;
        const u8 *tuning_block_pattern;
        int size, err;

        if (mmc->bus_width == 8) {
                tuning_block_pattern = tuning_blk_pattern_8bit;
                size = sizeof(tuning_blk_pattern_8bit);
        } else if (mmc->bus_width == 4) {
                tuning_block_pattern = tuning_blk_pattern_4bit;
                size = sizeof(tuning_blk_pattern_4bit);
        } else {
                return -EINVAL;
        }

        ALLOC_CACHE_ALIGN_BUFFER(u8, data_buf, size);

        cmd.cmdidx = opcode;
        cmd.cmdarg = 0;
        cmd.resp_type = MMC_RSP_R1;

        data.dest = (void *)data_buf;
        data.blocks = 1;
        data.blocksize = size;
        data.flags = MMC_DATA_READ;

        err = mmc_send_cmd(mmc, &cmd, &data);
        if (err)
                return err;

        if (memcmp(data_buf, tuning_block_pattern, size))
                return -EIO;

        return 0;
}
#endif

static int mmc_read_blocks(struct mmc *mmc, void *dst, lbaint_t start,
                           lbaint_t blkcnt)
{
        struct mmc_cmd cmd;
        struct mmc_data data;

        if (blkcnt > 1)
                cmd.cmdidx = MMC_CMD_READ_MULTIPLE_BLOCK;
        else
                cmd.cmdidx = MMC_CMD_READ_SINGLE_BLOCK;

        if (mmc->high_capacity)
                cmd.cmdarg = start;
        else
                cmd.cmdarg = start * mmc->read_bl_len;

        cmd.resp_type = MMC_RSP_R1;

        data.dest = dst;
        data.blocks = blkcnt;
        data.blocksize = mmc->read_bl_len;
        data.flags = MMC_DATA_READ;

        if (mmc_send_cmd(mmc, &cmd, &data))
                return 0;

        if (blkcnt > 1) {
                cmd.cmdidx = MMC_CMD_STOP_TRANSMISSION;
                cmd.cmdarg = 0;
                cmd.resp_type = MMC_RSP_R1b;
                if (mmc_send_cmd(mmc, &cmd, NULL)) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
                        pr_err("mmc fail to send stop cmd\n");
#endif
                        return 0;
                }
        }

        return blkcnt;
}

#if !CONFIG_IS_ENABLED(DM_MMC)
static int mmc_get_b_max(struct mmc *mmc, void *dst, lbaint_t blkcnt)
{
        if (mmc->cfg->ops->get_b_max)
                return mmc->cfg->ops->get_b_max(mmc, dst, blkcnt);
        else
                return mmc->cfg->b_max;
}
#endif

#if CONFIG_IS_ENABLED(BLK)
ulong mmc_bread(struct udevice *dev, lbaint_t start, lbaint_t blkcnt, void *dst)
#else
ulong mmc_bread(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt,
                void *dst)
#endif
{
#if CONFIG_IS_ENABLED(BLK)
        struct blk_desc *block_dev = dev_get_uclass_plat(dev);
#endif
        int dev_num = block_dev->devnum;
        int err;
        lbaint_t cur, blocks_todo = blkcnt;
        uint b_max;

        if (blkcnt == 0)
                return 0;

        struct mmc *mmc = find_mmc_device(dev_num);
        if (!mmc)
                return 0;

        if (CONFIG_IS_ENABLED(MMC_TINY))
                err = mmc_switch_part(mmc, block_dev->hwpart);
        else
                err = blk_dselect_hwpart(block_dev, block_dev->hwpart);

        if (err < 0)
                return 0;

        if ((start + blkcnt) > block_dev->lba) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
                pr_err("MMC: block number 0x" LBAF " exceeds max(0x" LBAF ")\n",
                       start + blkcnt, block_dev->lba);
#endif
                return 0;
        }

        if (mmc_set_blocklen(mmc, mmc->read_bl_len)) {
                pr_debug("%s: Failed to set blocklen\n", __func__);
                return 0;
        }

        b_max = mmc_get_b_max(mmc, dst, blkcnt);

        do {
                cur = (blocks_todo > b_max) ? b_max : blocks_todo;
                if (mmc_read_blocks(mmc, dst, start, cur) != cur) {
                        pr_debug("%s: Failed to read blocks\n", __func__);
                        return 0;
                }
                blocks_todo -= cur;
                start += cur;
                dst += cur * mmc->read_bl_len;
        } while (blocks_todo > 0);

        return blkcnt;
}

static int mmc_go_idle(struct mmc *mmc)
{
        struct mmc_cmd cmd;
        int err;

        udelay(1000);

        cmd.cmdidx = MMC_CMD_GO_IDLE_STATE;
        cmd.cmdarg = 0;
        cmd.resp_type = MMC_RSP_NONE;

        err = mmc_send_cmd(mmc, &cmd, NULL);

        if (err)
                return err;

        udelay(2000);

        return 0;
}

#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
static int mmc_switch_voltage(struct mmc *mmc, int signal_voltage)
{
        struct mmc_cmd cmd;
        int err = 0;

        /*
         * Send CMD11 only if the request is to switch the card to
         * 1.8V signalling.
         */
        if (signal_voltage == MMC_SIGNAL_VOLTAGE_330)
                return mmc_set_signal_voltage(mmc, signal_voltage);

        cmd.cmdidx = SD_CMD_SWITCH_UHS18V;
        cmd.cmdarg = 0;
        cmd.resp_type = MMC_RSP_R1;

        err = mmc_send_cmd(mmc, &cmd, NULL);
        if (err)
                return err;

        if (!mmc_host_is_spi(mmc) && (cmd.response[0] & MMC_STATUS_ERROR))
                return -EIO;

        /*
         * The card should drive cmd and dat[0:3] low immediately
         * after the response of cmd11, but wait 100 us to be sure
         */
        err = mmc_wait_dat0(mmc, 0, 100);
        if (err == -ENOSYS)
                udelay(100);
        else if (err)
                return -ETIMEDOUT;

        /*
         * During a signal voltage level switch, the clock must be gated
         * for 5 ms according to the SD spec
         */
        mmc_set_clock(mmc, mmc->clock, MMC_CLK_DISABLE);

        err = mmc_set_signal_voltage(mmc, signal_voltage);
        if (err)
                return err;

        /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
        mdelay(10);
        mmc_set_clock(mmc, mmc->clock, MMC_CLK_ENABLE);

        /*
         * Failure to switch is indicated by the card holding
         * dat[0:3] low. Wait for at least 1 ms according to spec
         */
        err = mmc_wait_dat0(mmc, 1, 1000);
        if (err == -ENOSYS)
                udelay(1000);
        else if (err)
                return -ETIMEDOUT;

        return 0;
}
#endif

static int sd_send_op_cond(struct mmc *mmc, bool uhs_en)
{
        int timeout = 1000;
        int err;
        struct mmc_cmd cmd;

        while (1) {
                cmd.cmdidx = MMC_CMD_APP_CMD;
                cmd.resp_type = MMC_RSP_R1;
                cmd.cmdarg = 0;

                err = mmc_send_cmd(mmc, &cmd, NULL);

                if (err)
                        return err;

                cmd.cmdidx = SD_CMD_APP_SEND_OP_COND;
                cmd.resp_type = MMC_RSP_R3;

                /*
                 * Most cards do not answer if some reserved bits
                 * in the ocr are set. However, Some controller
                 * can set bit 7 (reserved for low voltages), but
                 * how to manage low voltages SD card is not yet
                 * specified.
                 */
                cmd.cmdarg = mmc_host_is_spi(mmc) ? 0 :
                        (mmc->cfg->voltages & 0xff8000);

                if (mmc->version == SD_VERSION_2)
                        cmd.cmdarg |= OCR_HCS;

                if (uhs_en)
                        cmd.cmdarg |= OCR_S18R;

                err = mmc_send_cmd(mmc, &cmd, NULL);

                if (err)
                        return err;

                if (cmd.response[0] & OCR_BUSY)
                        break;

                if (timeout-- <= 0)
                        return -EOPNOTSUPP;

                udelay(1000);
        }

        if (mmc->version != SD_VERSION_2)
                mmc->version = SD_VERSION_1_0;

        if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
                cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
                cmd.resp_type = MMC_RSP_R3;
                cmd.cmdarg = 0;

                err = mmc_send_cmd(mmc, &cmd, NULL);

                if (err)
                        return err;
        }

        mmc->ocr = cmd.response[0];

#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
        if (uhs_en && !(mmc_host_is_spi(mmc)) && (cmd.response[0] & 0x41000000)
            == 0x41000000) {
                err = mmc_switch_voltage(mmc, MMC_SIGNAL_VOLTAGE_180);
                if (err)
                        return err;
        }
#endif

        mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
        mmc->rca = 0;

        return 0;
}

static int mmc_send_op_cond_iter(struct mmc *mmc, int use_arg)
{
        struct mmc_cmd cmd;
        int err;

        cmd.cmdidx = MMC_CMD_SEND_OP_COND;
        cmd.resp_type = MMC_RSP_R3;
        cmd.cmdarg = 0;
        if (use_arg && !mmc_host_is_spi(mmc))
                cmd.cmdarg = OCR_HCS |
                        (mmc->cfg->voltages &
                        (mmc->ocr & OCR_VOLTAGE_MASK)) |
                        (mmc->ocr & OCR_ACCESS_MODE);

        err = mmc_send_cmd(mmc, &cmd, NULL);
        if (err)
                return err;
        mmc->ocr = cmd.response[0];
        return 0;
}

static int mmc_send_op_cond(struct mmc *mmc)
{
        int err, i;
        int timeout = 1000;
        uint start;

        /* Some cards seem to need this */
        mmc_go_idle(mmc);

        start = get_timer(0);
        /* Asking to the card its capabilities */
        for (i = 0; ; i++) {
                err = mmc_send_op_cond_iter(mmc, i != 0);
                if (err)
                        return err;

                /* exit if not busy (flag seems to be inverted) */
                if (mmc->ocr & OCR_BUSY)
                        break;

                if (get_timer(start) > timeout)
                        return -ETIMEDOUT;
                udelay(100);
        }
        mmc->op_cond_pending = 1;
        return 0;
}

static int mmc_complete_op_cond(struct mmc *mmc)
{
        struct mmc_cmd cmd;
        int timeout = 1000;
        ulong start;
        int err;

        mmc->op_cond_pending = 0;
        if (!(mmc->ocr & OCR_BUSY)) {
                /* Some cards seem to need this */
                mmc_go_idle(mmc);

                start = get_timer(0);
                while (1) {
                        err = mmc_send_op_cond_iter(mmc, 1);
                        if (err)
                                return err;
                        if (mmc->ocr & OCR_BUSY)
                                break;
                        if (get_timer(start) > timeout)
                                return -EOPNOTSUPP;
                        udelay(100);
                }
        }

        if (mmc_host_is_spi(mmc)) { /* read OCR for spi */
                cmd.cmdidx = MMC_CMD_SPI_READ_OCR;
                cmd.resp_type = MMC_RSP_R3;
                cmd.cmdarg = 0;

                err = mmc_send_cmd(mmc, &cmd, NULL);

                if (err)
                        return err;

                mmc->ocr = cmd.response[0];
        }

        mmc->version = MMC_VERSION_UNKNOWN;

        mmc->high_capacity = ((mmc->ocr & OCR_HCS) == OCR_HCS);
        mmc->rca = 1;

        return 0;
}


int mmc_send_ext_csd(struct mmc *mmc, u8 *ext_csd)
{
        struct mmc_cmd cmd;
        struct mmc_data data;
        int err;

        /* Get the Card Status Register */
        cmd.cmdidx = MMC_CMD_SEND_EXT_CSD;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = 0;

        data.dest = (char *)ext_csd;
        data.blocks = 1;
        data.blocksize = MMC_MAX_BLOCK_LEN;
        data.flags = MMC_DATA_READ;

        err = mmc_send_cmd(mmc, &cmd, &data);

        return err;
}

static int __mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value,
                        bool send_status)
{
        unsigned int status, start;
        struct mmc_cmd cmd;
        int timeout_ms = DEFAULT_CMD6_TIMEOUT_MS;
        bool is_part_switch = (set == EXT_CSD_CMD_SET_NORMAL) &&
                              (index == EXT_CSD_PART_CONF);
        int ret;

        if (mmc->gen_cmd6_time)
                timeout_ms = mmc->gen_cmd6_time * 10;

        if (is_part_switch  && mmc->part_switch_time)
                timeout_ms = mmc->part_switch_time * 10;

        cmd.cmdidx = MMC_CMD_SWITCH;
        cmd.resp_type = MMC_RSP_R1b;
        cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
                                 (index << 16) |
                                 (value << 8);

        ret = mmc_send_cmd_retry(mmc, &cmd, NULL, 3);
        if (ret)
                return ret;

        start = get_timer(0);

        /* poll dat0 for rdy/buys status */
        ret = mmc_wait_dat0(mmc, 1, timeout_ms * 1000);
        if (ret && ret != -ENOSYS)
                return ret;

        /*
         * In cases when neiter allowed to poll by using CMD13 nor we are
         * capable of polling by using mmc_wait_dat0, then rely on waiting the
         * stated timeout to be sufficient.
         */
        if (ret == -ENOSYS && !send_status) {
                mdelay(timeout_ms);
                return 0;
        }

        /* Finally wait until the card is ready or indicates a failure
         * to switch. It doesn't hurt to use CMD13 here even if send_status
         * is false, because by now (after 'timeout_ms' ms) the bus should be
         * reliable.
         */
        do {
                ret = mmc_send_status(mmc, &status);

                if (!ret && (status & MMC_STATUS_SWITCH_ERROR)) {
                        pr_debug("switch failed %d/%d/0x%x !\n", set, index,
                                 value);
                        return -EIO;
                }
                if (!ret && (status & MMC_STATUS_RDY_FOR_DATA) &&
                    (status & MMC_STATUS_CURR_STATE) == MMC_STATE_TRANS)
                        return 0;
                udelay(100);
        } while (get_timer(start) < timeout_ms);

        return -ETIMEDOUT;
}

int mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value)
{
        return __mmc_switch(mmc, set, index, value, true);
}

int mmc_boot_wp(struct mmc *mmc)
{
        return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP, 1);
}

#if !CONFIG_IS_ENABLED(MMC_TINY)
static int mmc_set_card_speed(struct mmc *mmc, enum bus_mode mode,
                              bool hsdowngrade)
{
        int err;
        int speed_bits;

        ALLOC_CACHE_ALIGN_BUFFER(u8, test_csd, MMC_MAX_BLOCK_LEN);

        switch (mode) {
        case MMC_HS:
        case MMC_HS_52:
        case MMC_DDR_52:
                speed_bits = EXT_CSD_TIMING_HS;
                break;
#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT)
        case MMC_HS_200:
                speed_bits = EXT_CSD_TIMING_HS200;
                break;
#endif
#if CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
        case MMC_HS_400:
                speed_bits = EXT_CSD_TIMING_HS400;
                break;
#endif
#if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
        case MMC_HS_400_ES:
                speed_bits = EXT_CSD_TIMING_HS400;
                break;
#endif
        case MMC_LEGACY:
                speed_bits = EXT_CSD_TIMING_LEGACY;
                break;
        default:
                return -EINVAL;
        }

        err = __mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
                           speed_bits, !hsdowngrade);
        if (err)
                return err;

#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || \
    CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
        /*
         * In case the eMMC is in HS200/HS400 mode and we are downgrading
         * to HS mode, the card clock are still running much faster than
         * the supported HS mode clock, so we can not reliably read out
         * Extended CSD. Reconfigure the controller to run at HS mode.
         */
        if (hsdowngrade) {
                mmc_select_mode(mmc, MMC_HS);
                mmc_set_clock(mmc, mmc_mode2freq(mmc, MMC_HS), false);
        }
#endif

        if ((mode == MMC_HS) || (mode == MMC_HS_52)) {
                /* Now check to see that it worked */
                err = mmc_send_ext_csd(mmc, test_csd);
                if (err)
                        return err;

                /* No high-speed support */
                if (!test_csd[EXT_CSD_HS_TIMING])
                        return -ENOTSUPP;
        }

        return 0;
}

static int mmc_get_capabilities(struct mmc *mmc)
{
        u8 *ext_csd = mmc->ext_csd;
        char cardtype;

        mmc->card_caps = MMC_MODE_1BIT | MMC_CAP(MMC_LEGACY);

        if (mmc_host_is_spi(mmc))
                return 0;

        /* Only version 4 supports high-speed */
        if (mmc->version < MMC_VERSION_4)
                return 0;

        if (!ext_csd) {
                pr_err("No ext_csd found!\n"); /* this should enver happen */
                return -ENOTSUPP;
        }

        mmc->card_caps |= MMC_MODE_4BIT | MMC_MODE_8BIT;

        cardtype = ext_csd[EXT_CSD_CARD_TYPE];
        mmc->cardtype = cardtype;

#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT)
        if (cardtype & (EXT_CSD_CARD_TYPE_HS200_1_2V |
                        EXT_CSD_CARD_TYPE_HS200_1_8V)) {
                mmc->card_caps |= MMC_MODE_HS200;
        }
#endif
#if CONFIG_IS_ENABLED(MMC_HS400_SUPPORT) || \
        CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
        if (cardtype & (EXT_CSD_CARD_TYPE_HS400_1_2V |
                        EXT_CSD_CARD_TYPE_HS400_1_8V)) {
                mmc->card_caps |= MMC_MODE_HS400;
        }
#endif
        if (cardtype & EXT_CSD_CARD_TYPE_52) {
                if (cardtype & EXT_CSD_CARD_TYPE_DDR_52)
                        mmc->card_caps |= MMC_MODE_DDR_52MHz;
                mmc->card_caps |= MMC_MODE_HS_52MHz;
        }
        if (cardtype & EXT_CSD_CARD_TYPE_26)
                mmc->card_caps |= MMC_MODE_HS;

#if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
        if (ext_csd[EXT_CSD_STROBE_SUPPORT] &&
            (mmc->card_caps & MMC_MODE_HS400)) {
                mmc->card_caps |= MMC_MODE_HS400_ES;
        }
#endif

        return 0;
}
#endif

static int mmc_set_capacity(struct mmc *mmc, int part_num)
{
        switch (part_num) {
        case 0:
                mmc->capacity = mmc->capacity_user;
                break;
        case 1:
        case 2:
                mmc->capacity = mmc->capacity_boot;
                break;
        case 3:
                mmc->capacity = mmc->capacity_rpmb;

                break;
        case 4:
        case 5:
        case 6:
        case 7:
                mmc->capacity = mmc->capacity_gp[part_num - 4];
                break;
        default:
                return -1;
        }

        mmc_get_blk_desc(mmc)->lba = lldiv(mmc->capacity, mmc->read_bl_len);

        return 0;
}

int mmc_switch_part(struct mmc *mmc, unsigned int part_num)
{
        int ret;
        int retry = 3;

        do {
                ret = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                 EXT_CSD_PART_CONF,
                                 (mmc->part_config & ~PART_ACCESS_MASK)
                                 | (part_num & PART_ACCESS_MASK));
        } while (ret && retry--);

        /*
         * Set the capacity if the switch succeeded or was intended
         * to return to representing the raw device.
         */
        if ((ret == 0) || ((ret == -ENODEV) && (part_num == 0))) {
                ret = mmc_set_capacity(mmc, part_num);
                mmc_get_blk_desc(mmc)->hwpart = part_num;
        }

        return ret;
}

#if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING)
int mmc_hwpart_config(struct mmc *mmc,
                      const struct mmc_hwpart_conf *conf,
                      enum mmc_hwpart_conf_mode mode)
{
        u8 part_attrs = 0;
        u32 enh_size_mult;
        u32 enh_start_addr;
        u32 gp_size_mult[4];
        u32 max_enh_size_mult;
        u32 tot_enh_size_mult = 0;
        u8 wr_rel_set;
        int i, pidx, err;
        ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);

        if (mode < MMC_HWPART_CONF_CHECK || mode > MMC_HWPART_CONF_COMPLETE)
                return -EINVAL;

        if (IS_SD(mmc) || (mmc->version < MMC_VERSION_4_41)) {
                pr_err("eMMC >= 4.4 required for enhanced user data area\n");
                return -EMEDIUMTYPE;
        }

        if (!(mmc->part_support & PART_SUPPORT)) {
                pr_err("Card does not support partitioning\n");
                return -EMEDIUMTYPE;
        }

        if (!mmc->hc_wp_grp_size) {
                pr_err("Card does not define HC WP group size\n");
                return -EMEDIUMTYPE;
        }

        /* check partition alignment and total enhanced size */
        if (conf->user.enh_size) {
                if (conf->user.enh_size % mmc->hc_wp_grp_size ||
                    conf->user.enh_start % mmc->hc_wp_grp_size) {
                        pr_err("User data enhanced area not HC WP group "
                               "size aligned\n");
                        return -EINVAL;
                }
                part_attrs |= EXT_CSD_ENH_USR;
                enh_size_mult = conf->user.enh_size / mmc->hc_wp_grp_size;
                if (mmc->high_capacity) {
                        enh_start_addr = conf->user.enh_start;
                } else {
                        enh_start_addr = (conf->user.enh_start << 9);
                }
        } else {
                enh_size_mult = 0;
                enh_start_addr = 0;
        }
        tot_enh_size_mult += enh_size_mult;

        for (pidx = 0; pidx < 4; pidx++) {
                if (conf->gp_part[pidx].size % mmc->hc_wp_grp_size) {
                        pr_err("GP%i partition not HC WP group size "
                               "aligned\n", pidx+1);
                        return -EINVAL;
                }
                gp_size_mult[pidx] = conf->gp_part[pidx].size / mmc->hc_wp_grp_size;
                if (conf->gp_part[pidx].size && conf->gp_part[pidx].enhanced) {
                        part_attrs |= EXT_CSD_ENH_GP(pidx);
                        tot_enh_size_mult += gp_size_mult[pidx];
                }
        }

        if (part_attrs && ! (mmc->part_support & ENHNCD_SUPPORT)) {
                pr_err("Card does not support enhanced attribute\n");
                return -EMEDIUMTYPE;
        }

        err = mmc_send_ext_csd(mmc, ext_csd);
        if (err)
                return err;

        max_enh_size_mult =
                (ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT+2] << 16) +
                (ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT+1] << 8) +
                ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT];
        if (tot_enh_size_mult > max_enh_size_mult) {
                pr_err("Total enhanced size exceeds maximum (%u > %u)\n",
                       tot_enh_size_mult, max_enh_size_mult);
                return -EMEDIUMTYPE;
        }

        /* The default value of EXT_CSD_WR_REL_SET is device
         * dependent, the values can only be changed if the
         * EXT_CSD_HS_CTRL_REL bit is set. The values can be
         * changed only once and before partitioning is completed. */
        wr_rel_set = ext_csd[EXT_CSD_WR_REL_SET];
        if (conf->user.wr_rel_change) {
                if (conf->user.wr_rel_set)
                        wr_rel_set |= EXT_CSD_WR_DATA_REL_USR;
                else
                        wr_rel_set &= ~EXT_CSD_WR_DATA_REL_USR;
        }
        for (pidx = 0; pidx < 4; pidx++) {
                if (conf->gp_part[pidx].wr_rel_change) {
                        if (conf->gp_part[pidx].wr_rel_set)
                                wr_rel_set |= EXT_CSD_WR_DATA_REL_GP(pidx);
                        else
                                wr_rel_set &= ~EXT_CSD_WR_DATA_REL_GP(pidx);
                }
        }

        if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET] &&
            !(ext_csd[EXT_CSD_WR_REL_PARAM] & EXT_CSD_HS_CTRL_REL)) {
                puts("Card does not support host controlled partition write "
                     "reliability settings\n");
                return -EMEDIUMTYPE;
        }

        if (ext_csd[EXT_CSD_PARTITION_SETTING] &
            EXT_CSD_PARTITION_SETTING_COMPLETED) {
                pr_err("Card already partitioned\n");
                return -EPERM;
        }

        if (mode == MMC_HWPART_CONF_CHECK)
                return 0;

        /* Partitioning requires high-capacity size definitions */
        if (!(ext_csd[EXT_CSD_ERASE_GROUP_DEF] & 0x01)) {
                err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                 EXT_CSD_ERASE_GROUP_DEF, 1);

                if (err)
                        return err;

                ext_csd[EXT_CSD_ERASE_GROUP_DEF] = 1;

#if CONFIG_IS_ENABLED(MMC_WRITE)
                /* update erase group size to be high-capacity */
                mmc->erase_grp_size =
                        ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] * 1024;
#endif

        }

        /* all OK, write the configuration */
        for (i = 0; i < 4; i++) {
                err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                 EXT_CSD_ENH_START_ADDR+i,
                                 (enh_start_addr >> (i*8)) & 0xFF);
                if (err)
                        return err;
        }
        for (i = 0; i < 3; i++) {
                err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                 EXT_CSD_ENH_SIZE_MULT+i,
                                 (enh_size_mult >> (i*8)) & 0xFF);
                if (err)
                        return err;
        }
        for (pidx = 0; pidx < 4; pidx++) {
                for (i = 0; i < 3; i++) {
                        err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                         EXT_CSD_GP_SIZE_MULT+pidx*3+i,
                                         (gp_size_mult[pidx] >> (i*8)) & 0xFF);
                        if (err)
                                return err;
                }
        }
        err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                         EXT_CSD_PARTITIONS_ATTRIBUTE, part_attrs);
        if (err)
                return err;

        if (mode == MMC_HWPART_CONF_SET)
                return 0;

        /* The WR_REL_SET is a write-once register but shall be
         * written before setting PART_SETTING_COMPLETED. As it is
         * write-once we can only write it when completing the
         * partitioning. */
        if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET]) {
                err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                 EXT_CSD_WR_REL_SET, wr_rel_set);
                if (err)
                        return err;
        }

        /* Setting PART_SETTING_COMPLETED confirms the partition
         * configuration but it only becomes effective after power
         * cycle, so we do not adjust the partition related settings
         * in the mmc struct. */

        err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                         EXT_CSD_PARTITION_SETTING,
                         EXT_CSD_PARTITION_SETTING_COMPLETED);
        if (err)
                return err;

        return 0;
}
#endif

#if !CONFIG_IS_ENABLED(DM_MMC)
int mmc_getcd(struct mmc *mmc)
{
        int cd;

        cd = board_mmc_getcd(mmc);

        if (cd < 0) {
                if (mmc->cfg->ops->getcd)
                        cd = mmc->cfg->ops->getcd(mmc);
                else
                        cd = 1;
        }

        return cd;
}
#endif

#if !CONFIG_IS_ENABLED(MMC_TINY)
static int sd_switch(struct mmc *mmc, int mode, int group, u8 value, u8 *resp)
{
        struct mmc_cmd cmd;
        struct mmc_data data;

        /* Switch the frequency */
        cmd.cmdidx = SD_CMD_SWITCH_FUNC;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = (mode << 31) | 0xffffff;
        cmd.cmdarg &= ~(0xf << (group * 4));
        cmd.cmdarg |= value << (group * 4);

        data.dest = (char *)resp;
        data.blocksize = 64;
        data.blocks = 1;
        data.flags = MMC_DATA_READ;

        return mmc_send_cmd(mmc, &cmd, &data);
}

static int sd_get_capabilities(struct mmc *mmc)
{
        int err;
        struct mmc_cmd cmd;
        ALLOC_CACHE_ALIGN_BUFFER(__be32, scr, 2);
        ALLOC_CACHE_ALIGN_BUFFER(__be32, switch_status, 16);
        struct mmc_data data;
        int timeout;
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
        u32 sd3_bus_mode;
#endif

        mmc->card_caps = MMC_MODE_1BIT | MMC_CAP(MMC_LEGACY);

        if (mmc_host_is_spi(mmc))
                return 0;

        /* Read the SCR to find out if this card supports higher speeds */
        cmd.cmdidx = MMC_CMD_APP_CMD;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = mmc->rca << 16;

        err = mmc_send_cmd(mmc, &cmd, NULL);

        if (err)
                return err;

        cmd.cmdidx = SD_CMD_APP_SEND_SCR;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = 0;

        data.dest = (char *)scr;
        data.blocksize = 8;
        data.blocks = 1;
        data.flags = MMC_DATA_READ;

        err = mmc_send_cmd_retry(mmc, &cmd, &data, 3);

        if (err)
                return err;

        mmc->scr[0] = __be32_to_cpu(scr[0]);
        mmc->scr[1] = __be32_to_cpu(scr[1]);

        switch ((mmc->scr[0] >> 24) & 0xf) {
        case 0:
                mmc->version = SD_VERSION_1_0;
                break;
        case 1:
                mmc->version = SD_VERSION_1_10;
                break;
        case 2:
                mmc->version = SD_VERSION_2;
                if ((mmc->scr[0] >> 15) & 0x1)
                        mmc->version = SD_VERSION_3;
                break;
        default:
                mmc->version = SD_VERSION_1_0;
                break;
        }

        if (mmc->scr[0] & SD_DATA_4BIT)
                mmc->card_caps |= MMC_MODE_4BIT;

        /* Version 1.0 doesn't support switching */
        if (mmc->version == SD_VERSION_1_0)
                return 0;

        timeout = 4;
        while (timeout--) {
                err = sd_switch(mmc, SD_SWITCH_CHECK, 0, 1,
                                (u8 *)switch_status);

                if (err)
                        return err;

                /* The high-speed function is busy.  Try again */
                if (!(__be32_to_cpu(switch_status[7]) & SD_HIGHSPEED_BUSY))
                        break;
        }

        /* If high-speed isn't supported, we return */
        if (__be32_to_cpu(switch_status[3]) & SD_HIGHSPEED_SUPPORTED)
                mmc->card_caps |= MMC_CAP(SD_HS);

#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
        /* Version before 3.0 don't support UHS modes */
        if (mmc->version < SD_VERSION_3)
                return 0;

        sd3_bus_mode = __be32_to_cpu(switch_status[3]) >> 16 & 0x1f;
        if (sd3_bus_mode & SD_MODE_UHS_SDR104)
                mmc->card_caps |= MMC_CAP(UHS_SDR104);
        if (sd3_bus_mode & SD_MODE_UHS_SDR50)
                mmc->card_caps |= MMC_CAP(UHS_SDR50);
        if (sd3_bus_mode & SD_MODE_UHS_SDR25)
                mmc->card_caps |= MMC_CAP(UHS_SDR25);
        if (sd3_bus_mode & SD_MODE_UHS_SDR12)
                mmc->card_caps |= MMC_CAP(UHS_SDR12);
        if (sd3_bus_mode & SD_MODE_UHS_DDR50)
                mmc->card_caps |= MMC_CAP(UHS_DDR50);
#endif

        return 0;
}

static int sd_set_card_speed(struct mmc *mmc, enum bus_mode mode)
{
        int err;

        ALLOC_CACHE_ALIGN_BUFFER(uint, switch_status, 16);
        int speed;

        /* SD version 1.00 and 1.01 does not support CMD 6 */
        if (mmc->version == SD_VERSION_1_0)
                return 0;

        switch (mode) {
        case MMC_LEGACY:
                speed = UHS_SDR12_BUS_SPEED;
                break;
        case SD_HS:
                speed = HIGH_SPEED_BUS_SPEED;
                break;
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
        case UHS_SDR12:
                speed = UHS_SDR12_BUS_SPEED;
                break;
        case UHS_SDR25:
                speed = UHS_SDR25_BUS_SPEED;
                break;
        case UHS_SDR50:
                speed = UHS_SDR50_BUS_SPEED;
                break;
        case UHS_DDR50:
                speed = UHS_DDR50_BUS_SPEED;
                break;
        case UHS_SDR104:
                speed = UHS_SDR104_BUS_SPEED;
                break;
#endif
        default:
                return -EINVAL;
        }

        err = sd_switch(mmc, SD_SWITCH_SWITCH, 0, speed, (u8 *)switch_status);
        if (err)
                return err;

        if (((__be32_to_cpu(switch_status[4]) >> 24) & 0xF) != speed)
                return -ENOTSUPP;

        return 0;
}

static int sd_select_bus_width(struct mmc *mmc, int w)
{
        int err;
        struct mmc_cmd cmd;

        if ((w != 4) && (w != 1))
                return -EINVAL;

        cmd.cmdidx = MMC_CMD_APP_CMD;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = mmc->rca << 16;

        err = mmc_send_cmd(mmc, &cmd, NULL);
        if (err)
                return err;

        cmd.cmdidx = SD_CMD_APP_SET_BUS_WIDTH;
        cmd.resp_type = MMC_RSP_R1;
        if (w == 4)
                cmd.cmdarg = 2;
        else if (w == 1)
                cmd.cmdarg = 0;
        err = mmc_send_cmd(mmc, &cmd, NULL);
        if (err)
                return err;

        return 0;
}
#endif

#if CONFIG_IS_ENABLED(MMC_WRITE)
static int sd_read_ssr(struct mmc *mmc)
{
        static const unsigned int sd_au_size[] = {
                0,              SZ_16K / 512,           SZ_32K / 512,
                SZ_64K / 512,   SZ_128K / 512,          SZ_256K / 512,
                SZ_512K / 512,  SZ_1M / 512,            SZ_2M / 512,
                SZ_4M / 512,    SZ_8M / 512,            (SZ_8M + SZ_4M) / 512,
                SZ_16M / 512,   (SZ_16M + SZ_8M) / 512, SZ_32M / 512,
                SZ_64M / 512,
        };
        int err, i;
        struct mmc_cmd cmd;
        ALLOC_CACHE_ALIGN_BUFFER(uint, ssr, 16);
        struct mmc_data data;
        unsigned int au, eo, et, es;

        cmd.cmdidx = MMC_CMD_APP_CMD;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = mmc->rca << 16;

        err = mmc_send_cmd_quirks(mmc, &cmd, NULL, MMC_QUIRK_RETRY_APP_CMD, 4);
        if (err)
                return err;

        cmd.cmdidx = SD_CMD_APP_SD_STATUS;
        cmd.resp_type = MMC_RSP_R1;
        cmd.cmdarg = 0;

        data.dest = (char *)ssr;
        data.blocksize = 64;
        data.blocks = 1;
        data.flags = MMC_DATA_READ;

        err = mmc_send_cmd_retry(mmc, &cmd, &data, 3);
        if (err)
                return err;

        for (i = 0; i < 16; i++)
                ssr[i] = be32_to_cpu(ssr[i]);

        au = (ssr[2] >> 12) & 0xF;
        if ((au <= 9) || (mmc->version == SD_VERSION_3)) {
                mmc->ssr.au = sd_au_size[au];
                es = (ssr[3] >> 24) & 0xFF;
                es |= (ssr[2] & 0xFF) << 8;
                et = (ssr[3] >> 18) & 0x3F;
                if (es && et) {
                        eo = (ssr[3] >> 16) & 0x3;
                        mmc->ssr.erase_timeout = (et * 1000) / es;
                        mmc->ssr.erase_offset = eo * 1000;
                }
        } else {
                pr_debug("Invalid Allocation Unit Size.\n");
        }

        return 0;
}
#endif
/* frequency bases */
/* divided by 10 to be nice to platforms without floating point */
static const int fbase[] = {
        10000,
        100000,
        1000000,
        10000000,
};

/* Multiplier values for TRAN_SPEED.  Multiplied by 10 to be nice
 * to platforms without floating point.
 */
static const u8 multipliers[] = {
        0,      /* reserved */
        10,
        12,
        13,
        15,
        20,
        25,
        30,
        35,
        40,
        45,
        50,
        55,
        60,
        70,
        80,
};

static inline int bus_width(uint cap)
{
        if (cap == MMC_MODE_8BIT)
                return 8;
        if (cap == MMC_MODE_4BIT)
                return 4;
        if (cap == MMC_MODE_1BIT)
                return 1;
        pr_warn("invalid bus witdh capability 0x%x\n", cap);
        return 0;
}

#if !CONFIG_IS_ENABLED(DM_MMC)
#ifdef MMC_SUPPORTS_TUNING
static int mmc_execute_tuning(struct mmc *mmc, uint opcode)
{
        return -ENOTSUPP;
}
#endif

static int mmc_set_ios(struct mmc *mmc)
{
        int ret = 0;

        if (mmc->cfg->ops->set_ios)
                ret = mmc->cfg->ops->set_ios(mmc);

        return ret;
}

static int mmc_host_power_cycle(struct mmc *mmc)
{
        int ret = 0;

        if (mmc->cfg->ops->host_power_cycle)
                ret = mmc->cfg->ops->host_power_cycle(mmc);

        return ret;
}
#endif

int mmc_set_clock(struct mmc *mmc, uint clock, bool disable)
{
        if (!disable) {
                if (clock > mmc->cfg->f_max)
                        clock = mmc->cfg->f_max;

                if (clock < mmc->cfg->f_min)
                        clock = mmc->cfg->f_min;
        }

        mmc->clock = clock;
        mmc->clk_disable = disable;

        debug("clock is %s (%dHz)\n", disable ? "disabled" : "enabled", clock);

        return mmc_set_ios(mmc);
}

static int mmc_set_bus_width(struct mmc *mmc, uint width)
{
        mmc->bus_width = width;

        return mmc_set_ios(mmc);
}

#if CONFIG_IS_ENABLED(MMC_VERBOSE) || defined(DEBUG)
/*
 * helper function to display the capabilities in a human
 * friendly manner. The capabilities include bus width and
 * supported modes.
 */
void mmc_dump_capabilities(const char *text, uint caps)
{
        enum bus_mode mode;

        pr_debug("%s: widths [", text);
        if (caps & MMC_MODE_8BIT)
                pr_debug("8, ");
        if (caps & MMC_MODE_4BIT)
                pr_debug("4, ");
        if (caps & MMC_MODE_1BIT)
                pr_debug("1, ");
        pr_debug("\b\b] modes [");
        for (mode = MMC_LEGACY; mode < MMC_MODES_END; mode++)
                if (MMC_CAP(mode) & caps)
                        pr_debug("%s, ", mmc_mode_name(mode));
        pr_debug("\b\b]\n");
}
#endif

struct mode_width_tuning {
        enum bus_mode mode;
        uint widths;
#ifdef MMC_SUPPORTS_TUNING
        uint tuning;
#endif
};

#if CONFIG_IS_ENABLED(MMC_IO_VOLTAGE)
int mmc_voltage_to_mv(enum mmc_voltage voltage)
{
        switch (voltage) {
        case MMC_SIGNAL_VOLTAGE_000: return 0;
        case MMC_SIGNAL_VOLTAGE_330: return 3300;
        case MMC_SIGNAL_VOLTAGE_180: return 1800;
        case MMC_SIGNAL_VOLTAGE_120: return 1200;
        }
        return -EINVAL;
}

static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage)
{
        int err;

        if (mmc->signal_voltage == signal_voltage)
                return 0;

        mmc->signal_voltage = signal_voltage;
        err = mmc_set_ios(mmc);
        if (err)
                pr_debug("unable to set voltage (err %d)\n", err);

        return err;
}
#else
static inline int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage)
{
        return 0;
}
#endif

#if !CONFIG_IS_ENABLED(MMC_TINY)
static const struct mode_width_tuning sd_modes_by_pref[] = {
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
#ifdef MMC_SUPPORTS_TUNING
        {
                .mode = UHS_SDR104,
                .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
                .tuning = MMC_CMD_SEND_TUNING_BLOCK
        },
#endif
        {
                .mode = UHS_SDR50,
                .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
        },
        {
                .mode = UHS_DDR50,
                .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
        },
        {
                .mode = UHS_SDR25,
                .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
        },
#endif
        {
                .mode = SD_HS,
                .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
        },
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
        {
                .mode = UHS_SDR12,
                .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
        },
#endif
        {
                .mode = MMC_LEGACY,
                .widths = MMC_MODE_4BIT | MMC_MODE_1BIT,
        }
};

#define for_each_sd_mode_by_pref(caps, mwt) \
        for (mwt = sd_modes_by_pref;\
             mwt < sd_modes_by_pref + ARRAY_SIZE(sd_modes_by_pref);\
             mwt++) \
                if (caps & MMC_CAP(mwt->mode))

static int sd_select_mode_and_width(struct mmc *mmc, uint card_caps)
{
        int err;
        uint widths[] = {MMC_MODE_4BIT, MMC_MODE_1BIT};
        const struct mode_width_tuning *mwt;
#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
        bool uhs_en = (mmc->ocr & OCR_S18R) ? true : false;
#else
        bool uhs_en = false;
#endif
        uint caps;

#ifdef DEBUG
        mmc_dump_capabilities("sd card", card_caps);
        mmc_dump_capabilities("host", mmc->host_caps);
#endif

        if (mmc_host_is_spi(mmc)) {
                mmc_set_bus_width(mmc, 1);
                mmc_select_mode(mmc, MMC_LEGACY);
                mmc_set_clock(mmc, mmc->tran_speed, MMC_CLK_ENABLE);
#if CONFIG_IS_ENABLED(MMC_WRITE)
                err = sd_read_ssr(mmc);
                if (err)
                        pr_warn("unable to read ssr\n");
#endif
                return 0;
        }

        /* Restrict card's capabilities by what the host can do */
        caps = card_caps & mmc->host_caps;

        if (!uhs_en)
                caps &= ~UHS_CAPS;

        for_each_sd_mode_by_pref(caps, mwt) {
                uint *w;

                for (w = widths; w < widths + ARRAY_SIZE(widths); w++) {
                        if (*w & caps & mwt->widths) {
                                pr_debug("trying mode %s width %d (at %d MHz)\n",
                                         mmc_mode_name(mwt->mode),
                                         bus_width(*w),
                                         mmc_mode2freq(mmc, mwt->mode) / 1000000);

                                /* configure the bus width (card + host) */
                                err = sd_select_bus_width(mmc, bus_width(*w));
                                if (err)
                                        goto error;
                                mmc_set_bus_width(mmc, bus_width(*w));

                                /* configure the bus mode (card) */
                                err = sd_set_card_speed(mmc, mwt->mode);
                                if (err)
                                        goto error;

                                /* configure the bus mode (host) */
                                mmc_select_mode(mmc, mwt->mode);
                                mmc_set_clock(mmc, mmc->tran_speed,
                                                MMC_CLK_ENABLE);

#ifdef MMC_SUPPORTS_TUNING
                                /* execute tuning if needed */
                                if (mwt->tuning && !mmc_host_is_spi(mmc)) {
                                        err = mmc_execute_tuning(mmc,
                                                                 mwt->tuning);
                                        if (err) {
                                                pr_debug("tuning failed\n");
                                                goto error;
                                        }
                                }
#endif

#if CONFIG_IS_ENABLED(MMC_WRITE)
                                err = sd_read_ssr(mmc);
                                if (err)
                                        pr_warn("unable to read ssr\n");
#endif
                                if (!err)
                                        return 0;

error:
                                /* revert to a safer bus speed */
                                mmc_select_mode(mmc, MMC_LEGACY);
                                mmc_set_clock(mmc, mmc->tran_speed,
                                                MMC_CLK_ENABLE);
                        }
                }
        }

        pr_err("unable to select a mode\n");
        return -ENOTSUPP;
}

/*
 * read the compare the part of ext csd that is constant.
 * This can be used to check that the transfer is working
 * as expected.
 */
static int mmc_read_and_compare_ext_csd(struct mmc *mmc)
{
        int err;
        const u8 *ext_csd = mmc->ext_csd;
        ALLOC_CACHE_ALIGN_BUFFER(u8, test_csd, MMC_MAX_BLOCK_LEN);

        if (mmc->version < MMC_VERSION_4)
                return 0;

        err = mmc_send_ext_csd(mmc, test_csd);
        if (err)
                return err;

        /* Only compare read only fields */
        if (ext_csd[EXT_CSD_PARTITIONING_SUPPORT]
                == test_csd[EXT_CSD_PARTITIONING_SUPPORT] &&
            ext_csd[EXT_CSD_HC_WP_GRP_SIZE]
                == test_csd[EXT_CSD_HC_WP_GRP_SIZE] &&
            ext_csd[EXT_CSD_REV]
                == test_csd[EXT_CSD_REV] &&
            ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]
                == test_csd[EXT_CSD_HC_ERASE_GRP_SIZE] &&
            memcmp(&ext_csd[EXT_CSD_SEC_CNT],
                   &test_csd[EXT_CSD_SEC_CNT], 4) == 0)
                return 0;

        return -EBADMSG;
}

#if CONFIG_IS_ENABLED(MMC_IO_VOLTAGE)
static int mmc_set_lowest_voltage(struct mmc *mmc, enum bus_mode mode,
                                  uint32_t allowed_mask)
{
        u32 card_mask = 0;

        switch (mode) {
        case MMC_HS_400_ES:
        case MMC_HS_400:
        case MMC_HS_200:
                if (mmc->cardtype & (EXT_CSD_CARD_TYPE_HS200_1_8V |
                    EXT_CSD_CARD_TYPE_HS400_1_8V))
                        card_mask |= MMC_SIGNAL_VOLTAGE_180;
                if (mmc->cardtype & (EXT_CSD_CARD_TYPE_HS200_1_2V |
                    EXT_CSD_CARD_TYPE_HS400_1_2V))
                        card_mask |= MMC_SIGNAL_VOLTAGE_120;
                break;
        case MMC_DDR_52:
                if (mmc->cardtype & EXT_CSD_CARD_TYPE_DDR_1_8V)
                        card_mask |= MMC_SIGNAL_VOLTAGE_330 |
                                     MMC_SIGNAL_VOLTAGE_180;
                if (mmc->cardtype & EXT_CSD_CARD_TYPE_DDR_1_2V)
                        card_mask |= MMC_SIGNAL_VOLTAGE_120;
                break;
        default:
                card_mask |= MMC_SIGNAL_VOLTAGE_330;
                break;
        }

        while (card_mask & allowed_mask) {
                enum mmc_voltage best_match;

                best_match = 1 << (ffs(card_mask & allowed_mask) - 1);
                if (!mmc_set_signal_voltage(mmc,  best_match))
                        return 0;

                allowed_mask &= ~best_match;
        }

        return -ENOTSUPP;
}
#else
static inline int mmc_set_lowest_voltage(struct mmc *mmc, enum bus_mode mode,
                                         uint32_t allowed_mask)
{
        return 0;
}
#endif

static const struct mode_width_tuning mmc_modes_by_pref[] = {
#if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
        {
                .mode = MMC_HS_400_ES,
                .widths = MMC_MODE_8BIT,
        },
#endif
#if CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
        {
                .mode = MMC_HS_400,
                .widths = MMC_MODE_8BIT,
                .tuning = MMC_CMD_SEND_TUNING_BLOCK_HS200
        },
#endif
#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT)
        {
                .mode = MMC_HS_200,
                .widths = MMC_MODE_8BIT | MMC_MODE_4BIT,
                .tuning = MMC_CMD_SEND_TUNING_BLOCK_HS200
        },
#endif
        {
                .mode = MMC_DDR_52,
                .widths = MMC_MODE_8BIT | MMC_MODE_4BIT,
        },
        {
                .mode = MMC_HS_52,
                .widths = MMC_MODE_8BIT | MMC_MODE_4BIT | MMC_MODE_1BIT,
        },
        {
                .mode = MMC_HS,
                .widths = MMC_MODE_8BIT | MMC_MODE_4BIT | MMC_MODE_1BIT,
        },
        {
                .mode = MMC_LEGACY,
                .widths = MMC_MODE_8BIT | MMC_MODE_4BIT | MMC_MODE_1BIT,
        }
};

#define for_each_mmc_mode_by_pref(caps, mwt) \
        for (mwt = mmc_modes_by_pref;\
            mwt < mmc_modes_by_pref + ARRAY_SIZE(mmc_modes_by_pref);\
            mwt++) \
                if (caps & MMC_CAP(mwt->mode))

static const struct ext_csd_bus_width {
        uint cap;
        bool is_ddr;
        uint ext_csd_bits;
} ext_csd_bus_width[] = {
        {MMC_MODE_8BIT, true, EXT_CSD_DDR_BUS_WIDTH_8},
        {MMC_MODE_4BIT, true, EXT_CSD_DDR_BUS_WIDTH_4},
        {MMC_MODE_8BIT, false, EXT_CSD_BUS_WIDTH_8},
        {MMC_MODE_4BIT, false, EXT_CSD_BUS_WIDTH_4},
        {MMC_MODE_1BIT, false, EXT_CSD_BUS_WIDTH_1},
};

#if CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
static int mmc_select_hs400(struct mmc *mmc)
{
        int err;

        /* Set timing to HS200 for tuning */
        err = mmc_set_card_speed(mmc, MMC_HS_200, false);
        if (err)
                return err;

        /* configure the bus mode (host) */
        mmc_select_mode(mmc, MMC_HS_200);
        mmc_set_clock(mmc, mmc->tran_speed, false);

        /* execute tuning if needed */
        mmc->hs400_tuning = 1;
        err = mmc_execute_tuning(mmc, MMC_CMD_SEND_TUNING_BLOCK_HS200);
        mmc->hs400_tuning = 0;
        if (err) {
                debug("tuning failed\n");
                return err;
        }

        /* Set back to HS */
        mmc_set_card_speed(mmc, MMC_HS, true);

        err = mmc_hs400_prepare_ddr(mmc);
        if (err)
                return err;

        err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
                         EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_FLAG);
        if (err)
                return err;

        err = mmc_set_card_speed(mmc, MMC_HS_400, false);
        if (err)

                return err;

        mmc_select_mode(mmc, MMC_HS_400);
        err = mmc_set_clock(mmc, mmc->tran_speed, false);
        if (err)
                return err;

        return 0;
}
#else
static int mmc_select_hs400(struct mmc *mmc)
{
        return -ENOTSUPP;
}
#endif

#if CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
#if !CONFIG_IS_ENABLED(DM_MMC)
static int mmc_set_enhanced_strobe(struct mmc *mmc)
{
        return -ENOTSUPP;
}
#endif
static int mmc_select_hs400es(struct mmc *mmc)
{
        int err;

        err = mmc_set_card_speed(mmc, MMC_HS, true);
        if (err)
                return err;

        err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
                         EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_FLAG |
                         EXT_CSD_BUS_WIDTH_STROBE);
        if (err) {
                printf("switch to bus width for hs400 failed\n");
                return err;
        }
        /* TODO: driver strength */
        err = mmc_set_card_speed(mmc, MMC_HS_400_ES, false);
        if (err)
                return err;

        mmc_select_mode(mmc, MMC_HS_400_ES);
        err = mmc_set_clock(mmc, mmc->tran_speed, false);
        if (err)
                return err;

        return mmc_set_enhanced_strobe(mmc);
}
#else
static int mmc_select_hs400es(struct mmc *mmc)
{
        return -ENOTSUPP;
}
#endif

#define for_each_supported_width(caps, ddr, ecbv) \
        for (ecbv = ext_csd_bus_width;\
            ecbv < ext_csd_bus_width + ARRAY_SIZE(ext_csd_bus_width);\
            ecbv++) \
                if ((ddr == ecbv->is_ddr) && (caps & ecbv->cap))

static int mmc_select_mode_and_width(struct mmc *mmc, uint card_caps)
{
        int err = 0;
        const struct mode_width_tuning *mwt;
        const struct ext_csd_bus_width *ecbw;

#ifdef DEBUG
        mmc_dump_capabilities("mmc", card_caps);
        mmc_dump_capabilities("host", mmc->host_caps);
#endif

        if (mmc_host_is_spi(mmc)) {
                mmc_set_bus_width(mmc, 1);
                mmc_select_mode(mmc, MMC_LEGACY);
                mmc_set_clock(mmc, mmc->tran_speed, MMC_CLK_ENABLE);
                return 0;
        }

        /* Restrict card's capabilities by what the host can do */
        card_caps &= mmc->host_caps;

        /* Only version 4 of MMC supports wider bus widths */
        if (mmc->version < MMC_VERSION_4)
                return 0;

        if (!mmc->ext_csd) {
                pr_debug("No ext_csd found!\n"); /* this should enver happen */
                return -ENOTSUPP;
        }

#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || \
    CONFIG_IS_ENABLED(MMC_HS400_SUPPORT) || \
    CONFIG_IS_ENABLED(MMC_HS400_ES_SUPPORT)
        /*
         * In case the eMMC is in HS200/HS400 mode, downgrade to HS mode
         * before doing anything else, since a transition from either of
         * the HS200/HS400 mode directly to legacy mode is not supported.
         */
        if (mmc->selected_mode == MMC_HS_200 ||
            mmc->selected_mode == MMC_HS_400 ||
            mmc->selected_mode == MMC_HS_400_ES)
                mmc_set_card_speed(mmc, MMC_HS, true);
        else
#endif
                mmc_set_clock(mmc, mmc->legacy_speed, MMC_CLK_ENABLE);

        for_each_mmc_mode_by_pref(card_caps, mwt) {
                for_each_supported_width(card_caps & mwt->widths,
                                         mmc_is_mode_ddr(mwt->mode), ecbw) {
                        enum mmc_voltage old_voltage;
                        pr_debug("trying mode %s width %d (at %d MHz)\n",
                                 mmc_mode_name(mwt->mode),
                                 bus_width(ecbw->cap),
                                 mmc_mode2freq(mmc, mwt->mode) / 1000000);
                        old_voltage = mmc->signal_voltage;
                        err = mmc_set_lowest_voltage(mmc, mwt->mode,
                                                     MMC_ALL_SIGNAL_VOLTAGE);
                        if (err)
                                continue;

                        /* configure the bus width (card + host) */
                        err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                    EXT_CSD_BUS_WIDTH,
                                    ecbw->ext_csd_bits & ~EXT_CSD_DDR_FLAG);
                        if (err)
                                goto error;
                        mmc_set_bus_width(mmc, bus_width(ecbw->cap));

                        if (mwt->mode == MMC_HS_400) {
                                err = mmc_select_hs400(mmc);
                                if (err) {
                                        printf("Select HS400 failed %d\n", err);
                                        goto error;
                                }
                        } else if (mwt->mode == MMC_HS_400_ES) {
                                err = mmc_select_hs400es(mmc);
                                if (err) {
                                        printf("Select HS400ES failed %d\n",
                                               err);
                                        goto error;
                                }
                        } else {
                                /* configure the bus speed (card) */
                                err = mmc_set_card_speed(mmc, mwt->mode, false);
                                if (err)
                                        goto error;

                                /*
                                 * configure the bus width AND the ddr mode
                                 * (card). The host side will be taken care
                                 * of in the next step
                                 */
                                if (ecbw->ext_csd_bits & EXT_CSD_DDR_FLAG) {
                                        err = mmc_switch(mmc,
                                                         EXT_CSD_CMD_SET_NORMAL,
                                                         EXT_CSD_BUS_WIDTH,
                                                         ecbw->ext_csd_bits);
                                        if (err)
                                                goto error;
                                }

                                /* configure the bus mode (host) */
                                mmc_select_mode(mmc, mwt->mode);
                                mmc_set_clock(mmc, mmc->tran_speed,
                                              MMC_CLK_ENABLE);
#ifdef MMC_SUPPORTS_TUNING

                                /* execute tuning if needed */
                                if (mwt->tuning) {
                                        err = mmc_execute_tuning(mmc,
                                                                 mwt->tuning);
                                        if (err) {
                                                pr_debug("tuning failed : %d\n", err);
                                                goto error;
                                        }
                                }
#endif
                        }

                        /* do a transfer to check the configuration */
                        err = mmc_read_and_compare_ext_csd(mmc);
                        if (!err)
                                return 0;
error:
                        mmc_set_signal_voltage(mmc, old_voltage);
                        /* if an error occurred, revert to a safer bus mode */
                        mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                   EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_1);
                        mmc_select_mode(mmc, MMC_LEGACY);
                        mmc_set_bus_width(mmc, 1);
                }
        }

        pr_err("unable to select a mode : %d\n", err);

        return -ENOTSUPP;
}
#endif

#if CONFIG_IS_ENABLED(MMC_TINY)
DEFINE_CACHE_ALIGN_BUFFER(u8, ext_csd_bkup, MMC_MAX_BLOCK_LEN);
#endif

static int mmc_startup_v4(struct mmc *mmc)
{
        int err, i;
        u64 capacity;
        bool has_parts = false;
        bool part_completed;
        static const u32 mmc_versions[] = {
                MMC_VERSION_4,
                MMC_VERSION_4_1,
                MMC_VERSION_4_2,
                MMC_VERSION_4_3,
                MMC_VERSION_4_4,
                MMC_VERSION_4_41,
                MMC_VERSION_4_5,
                MMC_VERSION_5_0,
                MMC_VERSION_5_1
        };

#if CONFIG_IS_ENABLED(MMC_TINY)
        u8 *ext_csd = ext_csd_bkup;

        if (IS_SD(mmc) || mmc->version < MMC_VERSION_4)
                return 0;

        if (!mmc->ext_csd)
                memset(ext_csd_bkup, 0, sizeof(ext_csd_bkup));

        err = mmc_send_ext_csd(mmc, ext_csd);
        if (err)
                goto error;

        /* store the ext csd for future reference */
        if (!mmc->ext_csd)
                mmc->ext_csd = ext_csd;
#else
        ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);

        if (IS_SD(mmc) || (mmc->version < MMC_VERSION_4))
                return 0;

        /* check  ext_csd version and capacity */
        err = mmc_send_ext_csd(mmc, ext_csd);
        if (err)
                goto error;

        /* store the ext csd for future reference */
        if (!mmc->ext_csd)
                mmc->ext_csd = malloc(MMC_MAX_BLOCK_LEN);
        if (!mmc->ext_csd)
                return -ENOMEM;
        memcpy(mmc->ext_csd, ext_csd, MMC_MAX_BLOCK_LEN);
#endif
        if (ext_csd[EXT_CSD_REV] >= ARRAY_SIZE(mmc_versions))
                return -EINVAL;

        mmc->version = mmc_versions[ext_csd[EXT_CSD_REV]];

        if (mmc->version >= MMC_VERSION_4_2) {
                /*
                 * According to the JEDEC Standard, the value of
                 * ext_csd's capacity is valid if the value is more
                 * than 2GB
                 */
                capacity = ext_csd[EXT_CSD_SEC_CNT] << 0
                                | ext_csd[EXT_CSD_SEC_CNT + 1] << 8
                                | ext_csd[EXT_CSD_SEC_CNT + 2] << 16
                                | ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
                capacity *= MMC_MAX_BLOCK_LEN;
                if ((capacity >> 20) > 2 * 1024)
                        mmc->capacity_user = capacity;
        }

        if (mmc->version >= MMC_VERSION_4_5)
                mmc->gen_cmd6_time = ext_csd[EXT_CSD_GENERIC_CMD6_TIME];

        /* The partition data may be non-zero but it is only
         * effective if PARTITION_SETTING_COMPLETED is set in
         * EXT_CSD, so ignore any data if this bit is not set,
         * except for enabling the high-capacity group size
         * definition (see below).
         */
        part_completed = !!(ext_csd[EXT_CSD_PARTITION_SETTING] &
                            EXT_CSD_PARTITION_SETTING_COMPLETED);

        mmc->part_switch_time = ext_csd[EXT_CSD_PART_SWITCH_TIME];
        /* Some eMMC set the value too low so set a minimum */
        if (mmc->part_switch_time < MMC_MIN_PART_SWITCH_TIME && mmc->part_switch_time)
                mmc->part_switch_time = MMC_MIN_PART_SWITCH_TIME;

        /* store the partition info of emmc */
        mmc->part_support = ext_csd[EXT_CSD_PARTITIONING_SUPPORT];
        if ((ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT) ||
            ext_csd[EXT_CSD_BOOT_MULT])
                mmc->part_config = ext_csd[EXT_CSD_PART_CONF];
        if (part_completed &&
            (ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & ENHNCD_SUPPORT))
                mmc->part_attr = ext_csd[EXT_CSD_PARTITIONS_ATTRIBUTE];

        mmc->capacity_boot = ext_csd[EXT_CSD_BOOT_MULT] << 17;

        mmc->capacity_rpmb = ext_csd[EXT_CSD_RPMB_MULT] << 17;

        for (i = 0; i < 4; i++) {
                int idx = EXT_CSD_GP_SIZE_MULT + i * 3;
                uint mult = (ext_csd[idx + 2] << 16) +
                        (ext_csd[idx + 1] << 8) + ext_csd[idx];
                if (mult)
                        has_parts = true;
                if (!part_completed)
                        continue;
                mmc->capacity_gp[i] = mult;
                mmc->capacity_gp[i] *=
                        ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
                mmc->capacity_gp[i] *= ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
                mmc->capacity_gp[i] <<= 19;
        }

#ifndef CONFIG_SPL_BUILD
        if (part_completed) {
                mmc->enh_user_size =
                        (ext_csd[EXT_CSD_ENH_SIZE_MULT + 2] << 16) +
                        (ext_csd[EXT_CSD_ENH_SIZE_MULT + 1] << 8) +
                        ext_csd[EXT_CSD_ENH_SIZE_MULT];
                mmc->enh_user_size *= ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
                mmc->enh_user_size *= ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
                mmc->enh_user_size <<= 19;
                mmc->enh_user_start =
                        (ext_csd[EXT_CSD_ENH_START_ADDR + 3] << 24) +
                        (ext_csd[EXT_CSD_ENH_START_ADDR + 2] << 16) +
                        (ext_csd[EXT_CSD_ENH_START_ADDR + 1] << 8) +
                        ext_csd[EXT_CSD_ENH_START_ADDR];
                if (mmc->high_capacity)
                        mmc->enh_user_start <<= 9;
        }
#endif

        /*
         * Host needs to enable ERASE_GRP_DEF bit if device is
         * partitioned. This bit will be lost every time after a reset
         * or power off. This will affect erase size.
         */
        if (part_completed)
                has_parts = true;
        if ((ext_csd[EXT_CSD_PARTITIONING_SUPPORT] & PART_SUPPORT) &&
            (ext_csd[EXT_CSD_PARTITIONS_ATTRIBUTE] & PART_ENH_ATTRIB))
                has_parts = true;
        if (has_parts) {
                err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
                                 EXT_CSD_ERASE_GROUP_DEF, 1);

                if (err)
                        goto error;

                ext_csd[EXT_CSD_ERASE_GROUP_DEF] = 1;
        }

        if (ext_csd[EXT_CSD_ERASE_GROUP_DEF] & 0x01) {
#if CONFIG_IS_ENABLED(MMC_WRITE)
                /* Read out group size from ext_csd */
                mmc->erase_grp_size =
                        ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] * 1024;
#endif
                /*
                 * if high capacity and partition setting completed
                 * SEC_COUNT is valid even if it is smaller than 2 GiB
                 * JEDEC Standard JESD84-B45, 6.2.4
                 */
                if (mmc->high_capacity && part_completed) {
                        capacity = (ext_csd[EXT_CSD_SEC_CNT]) |
                                (ext_csd[EXT_CSD_SEC_CNT + 1] << 8) |
                                (ext_csd[EXT_CSD_SEC_CNT + 2] << 16) |
                                (ext_csd[EXT_CSD_SEC_CNT + 3] << 24);
                        capacity *= MMC_MAX_BLOCK_LEN;
                        mmc->capacity_user = capacity;
                }
        }
#if CONFIG_IS_ENABLED(MMC_WRITE)
        else {
                /* Calculate the group size from the csd value. */
                int erase_gsz, erase_gmul;

                erase_gsz = (mmc->csd[2] & 0x00007c00) >> 10;
                erase_gmul = (mmc->csd[2] & 0x000003e0) >> 5;
                mmc->erase_grp_size = (erase_gsz + 1)
                        * (erase_gmul + 1);
        }
#endif
#if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING)
        mmc->hc_wp_grp_size = 1024
                * ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]
                * ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
#endif

        mmc->wr_rel_set = ext_csd[EXT_CSD_WR_REL_SET];

        return 0;
error:
        if (mmc->ext_csd) {
#if !CONFIG_IS_ENABLED(MMC_TINY)
                free(mmc->ext_csd);
#endif
                mmc->ext_csd = NULL;
        }
        return err;
}

static int mmc_startup(struct mmc *mmc)
{
        int err, i;
        uint mult, freq;
        u64 cmult, csize;
        struct mmc_cmd cmd;
        struct blk_desc *bdesc;

#ifdef CONFIG_MMC_SPI_CRC_ON
        if (mmc_host_is_spi(mmc)) { /* enable CRC check for spi */
                cmd.cmdidx = MMC_CMD_SPI_CRC_ON_OFF;
                cmd.resp_type = MMC_RSP_R1;
                cmd.cmdarg = 1;
                err = mmc_send_cmd(mmc, &cmd, NULL);
                if (err)
                        return err;
        }
#endif

        /* Put the Card in Identify Mode */
        cmd.cmdidx = mmc_host_is_spi(mmc) ? MMC_CMD_SEND_CID :
                MMC_CMD_ALL_SEND_CID; /* cmd not supported in spi */
        cmd.resp_type = MMC_RSP_R2;
        cmd.cmdarg = 0;

        err = mmc_send_cmd_quirks(mmc, &cmd, NULL, MMC_QUIRK_RETRY_SEND_CID, 4);
        if (err)
                return err;

        memcpy(mmc->cid, cmd.response, 16);

        /*
         * For MMC cards, set the Relative Address.
         * For SD cards, get the Relatvie Address.
         * This also puts the cards into Standby State
         */
        if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
                cmd.cmdidx = SD_CMD_SEND_RELATIVE_ADDR;
                cmd.cmdarg = mmc->rca << 16;
                cmd.resp_type = MMC_RSP_R6;

                err = mmc_send_cmd(mmc, &cmd, NULL);

                if (err)
                        return err;

                if (IS_SD(mmc))
                        mmc->rca = (cmd.response[0] >> 16) & 0xffff;
        }

        /* Get the Card-Specific Data */
        cmd.cmdidx = MMC_CMD_SEND_CSD;
        cmd.resp_type = MMC_RSP_R2;
        cmd.cmdarg = mmc->rca << 16;

        err = mmc_send_cmd(mmc, &cmd, NULL);

        if (err)
                return err;

        mmc->csd[0] = cmd.response[0];
        mmc->csd[1] = cmd.response[1];
        mmc->csd[2] = cmd.response[2];
        mmc->csd[3] = cmd.response[3];

        if (mmc->version == MMC_VERSION_UNKNOWN) {
                int version = (cmd.response[0] >> 26) & 0xf;

                switch (version) {
                case 0:
                        mmc->version = MMC_VERSION_1_2;
                        break;
                case 1:
                        mmc->version = MMC_VERSION_1_4;
                        break;
                case 2:
                        mmc->version = MMC_VERSION_2_2;
                        break;
                case 3:
                        mmc->version = MMC_VERSION_3;
                        break;
                case 4:
                        mmc->version = MMC_VERSION_4;
                        break;
                default:
                        mmc->version = MMC_VERSION_1_2;
                        break;
                }
        }

        /* divide frequency by 10, since the mults are 10x bigger */
        freq = fbase[(cmd.response[0] & 0x7)];
        mult = multipliers[((cmd.response[0] >> 3) & 0xf)];

        mmc->legacy_speed = freq * mult;
        mmc_select_mode(mmc, MMC_LEGACY);

        mmc->dsr_imp = ((cmd.response[1] >> 12) & 0x1);
        mmc->read_bl_len = 1 << ((cmd.response[1] >> 16) & 0xf);
#if CONFIG_IS_ENABLED(MMC_WRITE)

        if (IS_SD(mmc))
                mmc->write_bl_len = mmc->read_bl_len;
        else
                mmc->write_bl_len = 1 << ((cmd.response[3] >> 22) & 0xf);
#endif

        if (mmc->high_capacity) {
                csize = (mmc->csd[1] & 0x3f) << 16
                        | (mmc->csd[2] & 0xffff0000) >> 16;
                cmult = 8;
        } else {
                csize = (mmc->csd[1] & 0x3ff) << 2
                        | (mmc->csd[2] & 0xc0000000) >> 30;
                cmult = (mmc->csd[2] & 0x00038000) >> 15;
        }

        mmc->capacity_user = (csize + 1) << (cmult + 2);
        mmc->capacity_user *= mmc->read_bl_len;
        mmc->capacity_boot = 0;
        mmc->capacity_rpmb = 0;
        for (i = 0; i < 4; i++)
                mmc->capacity_gp[i] = 0;

        if (mmc->read_bl_len > MMC_MAX_BLOCK_LEN)
                mmc->read_bl_len = MMC_MAX_BLOCK_LEN;

#if CONFIG_IS_ENABLED(MMC_WRITE)
        if (mmc->write_bl_len > MMC_MAX_BLOCK_LEN)
                mmc->write_bl_len = MMC_MAX_BLOCK_LEN;
#endif

        if ((mmc->dsr_imp) && (0xffffffff != mmc->dsr)) {
                cmd.cmdidx = MMC_CMD_SET_DSR;
                cmd.cmdarg = (mmc->dsr & 0xffff) << 16;
                cmd.resp_type = MMC_RSP_NONE;
                if (mmc_send_cmd(mmc, &cmd, NULL))
                        pr_warn("MMC: SET_DSR failed\n");
        }

        /* Select the card, and put it into Transfer Mode */
        if (!mmc_host_is_spi(mmc)) { /* cmd not supported in spi */
                cmd.cmdidx = MMC_CMD_SELECT_CARD;
                cmd.resp_type = MMC_RSP_R1;
                cmd.cmdarg = mmc->rca << 16;
                err = mmc_send_cmd(mmc, &cmd, NULL);

                if (err)
                        return err;
        }

        /*
         * For SD, its erase group is always one sector
         */
#if CONFIG_IS_ENABLED(MMC_WRITE)
        mmc->erase_grp_size = 1;
#endif
        mmc->part_config = MMCPART_NOAVAILABLE;

        err = mmc_startup_v4(mmc);
        if (err)
                return err;

        err = mmc_set_capacity(mmc, mmc_get_blk_desc(mmc)->hwpart);
        if (err)
                return err;

#if CONFIG_IS_ENABLED(MMC_TINY)
        mmc_set_clock(mmc, mmc->legacy_speed, false);
        mmc_select_mode(mmc, MMC_LEGACY);
        mmc_set_bus_width(mmc, 1);
#else
        if (IS_SD(mmc)) {
                err = sd_get_capabilities(mmc);
                if (err)
                        return err;
                err = sd_select_mode_and_width(mmc, mmc->card_caps);
        } else {
                err = mmc_get_capabilities(mmc);
                if (err)
                        return err;
                err = mmc_select_mode_and_width(mmc, mmc->card_caps);
        }
#endif
        if (err)
                return err;

        mmc->best_mode = mmc->selected_mode;

        /* Fix the block length for DDR mode */
        if (mmc->ddr_mode) {
                mmc->read_bl_len = MMC_MAX_BLOCK_LEN;
#if CONFIG_IS_ENABLED(MMC_WRITE)
                mmc->write_bl_len = MMC_MAX_BLOCK_LEN;
#endif
        }

        /* fill in device description */
        bdesc = mmc_get_blk_desc(mmc);
        bdesc->lun = 0;
        bdesc->hwpart = 0;
        bdesc->type = 0;
        bdesc->blksz = mmc->read_bl_len;
        bdesc->log2blksz = LOG2(bdesc->blksz);
        bdesc->lba = lldiv(mmc->capacity, mmc->read_bl_len);
#if !defined(CONFIG_SPL_BUILD) || \
                (defined(CONFIG_SPL_LIBCOMMON_SUPPORT) && \
                !CONFIG_IS_ENABLED(USE_TINY_PRINTF))
        sprintf(bdesc->vendor, "Man %06x Snr %04x%04x",
                mmc->cid[0] >> 24, (mmc->cid[2] & 0xffff),
                (mmc->cid[3] >> 16) & 0xffff);
        sprintf(bdesc->product, "%c%c%c%c%c%c", mmc->cid[0] & 0xff,
                (mmc->cid[1] >> 24), (mmc->cid[1] >> 16) & 0xff,
                (mmc->cid[1] >> 8) & 0xff, mmc->cid[1] & 0xff,
                (mmc->cid[2] >> 24) & 0xff);
        sprintf(bdesc->revision, "%d.%d", (mmc->cid[2] >> 20) & 0xf,
                (mmc->cid[2] >> 16) & 0xf);
#else
        bdesc->vendor[0] = 0;
        bdesc->product[0] = 0;
        bdesc->revision[0] = 0;
#endif

#if !defined(CONFIG_DM_MMC) && (!defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBDISK_SUPPORT))
        part_init(bdesc);
#endif

        return 0;
}

static int mmc_send_if_cond(struct mmc *mmc)
{
        struct mmc_cmd cmd;
        int err;

        cmd.cmdidx = SD_CMD_SEND_IF_COND;
        /* We set the bit if the host supports voltages between 2.7 and 3.6 V */
        cmd.cmdarg = ((mmc->cfg->voltages & 0xff8000) != 0) << 8 | 0xaa;
        cmd.resp_type = MMC_RSP_R7;

        err = mmc_send_cmd(mmc, &cmd, NULL);

        if (err)
                return err;

        if ((cmd.response[0] & 0xff) != 0xaa)
                return -EOPNOTSUPP;
        else
                mmc->version = SD_VERSION_2;

        return 0;
}

#if !CONFIG_IS_ENABLED(DM_MMC)
/* board-specific MMC power initializations. */
__weak void board_mmc_power_init(void)
{
}
#endif

static int mmc_power_init(struct mmc *mmc)
{
#if CONFIG_IS_ENABLED(DM_MMC)
#if CONFIG_IS_ENABLED(DM_REGULATOR)
        int ret;

        ret = device_get_supply_regulator(mmc->dev, "vmmc-supply",
                                          &mmc->vmmc_supply);
        if (ret)
                pr_debug("%s: No vmmc supply\n", mmc->dev->name);

        ret = device_get_supply_regulator(mmc->dev, "vqmmc-supply",
                                          &mmc->vqmmc_supply);
        if (ret)
                pr_debug("%s: No vqmmc supply\n", mmc->dev->name);
#endif
#else /* !CONFIG_DM_MMC */
        /*
         * Driver model should use a regulator, as above, rather than calling
         * out to board code.
         */
        board_mmc_power_init();
#endif
        return 0;
}

/*
 * put the host in the initial state:
 * - turn on Vdd (card power supply)
 * - configure the bus width and clock to minimal values
 */
static void mmc_set_initial_state(struct mmc *mmc)
{
        int err;

        /* First try to set 3.3V. If it fails set to 1.8V */
        err = mmc_set_signal_voltage(mmc, MMC_SIGNAL_VOLTAGE_330);
        if (err != 0)
                err = mmc_set_signal_voltage(mmc, MMC_SIGNAL_VOLTAGE_180);
        if (err != 0)
                pr_warn("mmc: failed to set signal voltage\n");

        mmc_select_mode(mmc, MMC_LEGACY);
        mmc_set_bus_width(mmc, 1);
        mmc_set_clock(mmc, 0, MMC_CLK_ENABLE);
}

static int mmc_power_on(struct mmc *mmc)
{
#if CONFIG_IS_ENABLED(DM_MMC) && CONFIG_IS_ENABLED(DM_REGULATOR)
        if (mmc->vmmc_supply) {
                int ret = regulator_set_enable(mmc->vmmc_supply, true);

                if (ret && ret != -EACCES) {
                        printf("Error enabling VMMC supply : %d\n", ret);
                        return ret;
                }
        }
#endif
        return 0;
}

static int mmc_power_off(struct mmc *mmc)
{
        mmc_set_clock(mmc, 0, MMC_CLK_DISABLE);
#if CONFIG_IS_ENABLED(DM_MMC) && CONFIG_IS_ENABLED(DM_REGULATOR)
        if (mmc->vmmc_supply) {
                int ret = regulator_set_enable(mmc->vmmc_supply, false);

                if (ret && ret != -EACCES) {
                        pr_debug("Error disabling VMMC supply : %d\n", ret);
                        return ret;
                }
        }
#endif
        return 0;
}

static int mmc_power_cycle(struct mmc *mmc)
{
        int ret;

        ret = mmc_power_off(mmc);
        if (ret)
                return ret;

        ret = mmc_host_power_cycle(mmc);
        if (ret)
                return ret;

        /*
         * SD spec recommends at least 1ms of delay. Let's wait for 2ms
         * to be on the safer side.
         */
        udelay(2000);
        return mmc_power_on(mmc);
}

int mmc_get_op_cond(struct mmc *mmc, bool quiet)
{
        bool uhs_en = supports_uhs(mmc->cfg->host_caps);
        int err;

        if (mmc->has_init)
                return 0;

        err = mmc_power_init(mmc);
        if (err)
                return err;

#ifdef CONFIG_MMC_QUIRKS
        mmc->quirks = MMC_QUIRK_RETRY_SET_BLOCKLEN |
                      MMC_QUIRK_RETRY_SEND_CID |
                      MMC_QUIRK_RETRY_APP_CMD;
#endif

        err = mmc_power_cycle(mmc);
        if (err) {
                /*
                 * if power cycling is not supported, we should not try
                 * to use the UHS modes, because we wouldn't be able to
                 * recover from an error during the UHS initialization.
                 */
                pr_debug("Unable to do a full power cycle. Disabling the UHS modes for safety\n");
                uhs_en = false;
                mmc->host_caps &= ~UHS_CAPS;
                err = mmc_power_on(mmc);
        }
        if (err)
                return err;

#if CONFIG_IS_ENABLED(DM_MMC)
        /*
         * Re-initialization is needed to clear old configuration for
         * mmc rescan.
         */
        err = mmc_reinit(mmc);
#else
        /* made sure it's not NULL earlier */
        err = mmc->cfg->ops->init(mmc);
#endif
        if (err)
                return err;
        mmc->ddr_mode = 0;

retry:
        mmc_set_initial_state(mmc);

        /* Reset the Card */
        err = mmc_go_idle(mmc);

        if (err)
                return err;

        /* The internal partition reset to user partition(0) at every CMD0 */
        mmc_get_blk_desc(mmc)->hwpart = 0;

        /* Test for SD version 2 */
        err = mmc_send_if_cond(mmc);

        /* Now try to get the SD card's operating condition */
        err = sd_send_op_cond(mmc, uhs_en);
        if (err && uhs_en) {
                uhs_en = false;
                mmc_power_cycle(mmc);
                goto retry;
        }

        /* If the command timed out, we check for an MMC card */
        if (err == -ETIMEDOUT) {
                err = mmc_send_op_cond(mmc);

                if (err) {
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
                        if (!quiet)
                                pr_err("Card did not respond to voltage select! : %d\n", err);
#endif
                        return -EOPNOTSUPP;
                }
        }

        return err;
}

int mmc_start_init(struct mmc *mmc)
{
        bool no_card;
        int err = 0;

        /*
         * all hosts are capable of 1 bit bus-width and able to use the legacy
         * timings.
         */
        mmc->host_caps = mmc->cfg->host_caps | MMC_CAP(MMC_LEGACY) |
                         MMC_MODE_1BIT;

        if (IS_ENABLED(CONFIG_MMC_SPEED_MODE_SET)) {
                if (mmc->user_speed_mode != MMC_MODES_END) {
                        int i;
                        /* set host caps */
                        if (mmc->host_caps & MMC_CAP(mmc->user_speed_mode)) {
                                /* Remove all existing speed capabilities */
                                for (i = MMC_LEGACY; i < MMC_MODES_END; i++)
                                        mmc->host_caps &= ~MMC_CAP(i);
                                mmc->host_caps |= (MMC_CAP(mmc->user_speed_mode)
                                                   | MMC_CAP(MMC_LEGACY) |
                                                   MMC_MODE_1BIT);
                        } else {
                                pr_err("bus_mode requested is not supported\n");
                                return -EINVAL;
                        }
                }
        }
#if CONFIG_IS_ENABLED(DM_MMC)
        mmc_deferred_probe(mmc);
#endif
#if !defined(CONFIG_MMC_BROKEN_CD)
        no_card = mmc_getcd(mmc) == 0;
#else
        no_card = 0;
#endif
#if !CONFIG_IS_ENABLED(DM_MMC)
        /* we pretend there's no card when init is NULL */
        no_card = no_card || (mmc->cfg->ops->init == NULL);
#endif
        if (no_card) {
                mmc->has_init = 0;
#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
                pr_err("MMC: no card present\n");
#endif
                return -ENOMEDIUM;
        }

        err = mmc_get_op_cond(mmc, false);

        if (!err)
                mmc->init_in_progress = 1;

        return err;
}

static int mmc_complete_init(struct mmc *mmc)
{
        int err = 0;

        mmc->init_in_progress = 0;
        if (mmc->op_cond_pending)
                err = mmc_complete_op_cond(mmc);

        if (!err)
                err = mmc_startup(mmc);
        if (err)
                mmc->has_init = 0;
        else
                mmc->has_init = 1;
        return err;
}

int mmc_init(struct mmc *mmc)
{
        int err = 0;
        __maybe_unused ulong start;
#if CONFIG_IS_ENABLED(DM_MMC)
        struct mmc_uclass_priv *upriv = dev_get_uclass_priv(mmc->dev);

        upriv->mmc = mmc;
#endif
        if (mmc->has_init)
                return 0;

        start = get_timer(0);

        if (!mmc->init_in_progress)
                err = mmc_start_init(mmc);

        if (!err)
                err = mmc_complete_init(mmc);
        if (err)
                pr_info("%s: %d, time %lu\n", __func__, err, get_timer(start));

        return err;
}

#if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT) || \
    CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) || \
    CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
int mmc_deinit(struct mmc *mmc)
{
        u32 caps_filtered;

        if (!mmc->has_init)
                return 0;

        if (IS_SD(mmc)) {
                caps_filtered = mmc->card_caps &
                        ~(MMC_CAP(UHS_SDR12) | MMC_CAP(UHS_SDR25) |
                          MMC_CAP(UHS_SDR50) | MMC_CAP(UHS_DDR50) |
                          MMC_CAP(UHS_SDR104));

                return sd_select_mode_and_width(mmc, caps_filtered);
        } else {
                caps_filtered = mmc->card_caps &
                        ~(MMC_CAP(MMC_HS_200) | MMC_CAP(MMC_HS_400) | MMC_CAP(MMC_HS_400_ES));

                return mmc_select_mode_and_width(mmc, caps_filtered);
        }
}
#endif

int mmc_set_dsr(struct mmc *mmc, u16 val)
{
        mmc->dsr = val;
        return 0;
}

/* CPU-specific MMC initializations */
__weak int cpu_mmc_init(struct bd_info *bis)
{
        return -1;
}

/* board-specific MMC initializations. */
__weak int board_mmc_init(struct bd_info *bis)
{
        return -1;
}

void mmc_set_preinit(struct mmc *mmc, int preinit)

{
        mmc->preinit = preinit;
}

#if CONFIG_IS_ENABLED(DM_MMC)
static int mmc_probe(struct bd_info *bis)
{
        int ret, i;
        struct uclass *uc;
        struct udevice *dev;

        ret = uclass_get(UCLASS_MMC, &uc);
        if (ret)
                return ret;

        /*
         * Try to add them in sequence order. Really with driver model we
         * should allow holes, but the current MMC list does not allow that.
         * So if we request 0, 1, 3 we will get 0, 1, 2.
         */
        for (i = 0; ; i++) {
                ret = uclass_get_device_by_seq(UCLASS_MMC, i, &dev);
                if (ret == -ENODEV)
                        break;
        }
        uclass_foreach_dev(dev, uc) {
                ret = device_probe(dev);
                if (ret)
                        pr_err("%s - probe failed: %d\n", dev->name, ret);
        }

        return 0;
}
#else
static int mmc_probe(struct bd_info *bis)
{
        if (board_mmc_init(bis) < 0)
                cpu_mmc_init(bis);

        return 0;
}
#endif

int mmc_initialize(struct bd_info *bis)
{
        static int initialized = 0;
        int ret;
        if (initialized)        /* Avoid initializing mmc multiple times */
                return 0;
        initialized = 1;

#if !CONFIG_IS_ENABLED(BLK)
#if !CONFIG_IS_ENABLED(MMC_TINY)
        mmc_list_init();
#endif
#endif
        ret = mmc_probe(bis);
        if (ret)
                return ret;

#ifndef CONFIG_SPL_BUILD
        print_mmc_devices(',');
#endif

        mmc_do_preinit();
        return 0;
}

#if CONFIG_IS_ENABLED(DM_MMC)
int mmc_init_device(int num)
{
        struct udevice *dev;
        struct mmc *m;
        int ret;

        if (uclass_get_device_by_seq(UCLASS_MMC, num, &dev)) {
                ret = uclass_get_device(UCLASS_MMC, num, &dev);
                if (ret)
                        return ret;
        }

        m = mmc_get_mmc_dev(dev);
        m->user_speed_mode = MMC_MODES_END; /* Initialising user set speed mode */

        if (!m)
                return 0;
        if (m->preinit)
                mmc_start_init(m);

        return 0;
}
#endif

#ifdef CONFIG_CMD_BKOPS_ENABLE
int mmc_set_bkops_enable(struct mmc *mmc)
{
        int err;
        ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);

        err = mmc_send_ext_csd(mmc, ext_csd);
        if (err) {
                puts("Could not get ext_csd register values\n");
                return err;
        }

        if (!(ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1)) {
                puts("Background operations not supported on device\n");
                return -EMEDIUMTYPE;
        }

        if (ext_csd[EXT_CSD_BKOPS_EN] & 0x1) {
                puts("Background operations already enabled\n");
                return 0;
        }

        err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BKOPS_EN, 1);
        if (err) {
                puts("Failed to enable manual background operations\n");
                return err;
        }

        puts("Enabled manual background operations\n");

        return 0;
}
#endif

__weak int mmc_get_env_dev(void)
{
#ifdef CONFIG_SYS_MMC_ENV_DEV
        return CONFIG_SYS_MMC_ENV_DEV;
#else
        return 0;
#endif
}