mmc.c

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/*
 *  linux/drivers/mmc/core/mmc.c
 *
 *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
 *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
 *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/err.h>
#include <linux/slab.h>
#include <linux/stat.h>

#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>

#include "core.h"
#include "bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"

static const unsigned int tran_exp[] = {
    10000,      100000,     1000000,    10000000,
    0,      0,      0,      0
};

static const unsigned char tran_mant[] = {
    0,  10, 12, 13, 15, 20, 25, 30,
    35, 40, 45, 50, 55, 60, 70, 80,
};

static const unsigned int tacc_exp[] = {
    1,  10, 100,    1000,   10000,  100000, 1000000, 10000000,
};

static const unsigned int tacc_mant[] = {
    0,  10, 12, 13, 15, 20, 25, 30,
    35, 40, 45, 50, 55, 60, 70, 80,
};

#define UNSTUFF_BITS(resp,start,size)                   \
    ({                              \
        const int __size = size;                \
        const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
        const int __off = 3 - ((start) / 32);           \
        const int __shft = (start) & 31;            \
        u32 __res;                      \
                                    \
        __res = resp[__off] >> __shft;              \
        if (__size + __shft > 32)               \
            __res |= resp[__off-1] << ((32 - __shft) % 32); \
        __res & __mask;                     \
    })

/*
 * Given the decoded CSD structure, decode the raw CID to our CID structure.
 */
static int mmc_decode_cid(struct mmc_card *card)
{
    u32 *resp = card->raw_cid;

    /*
     * The selection of the format here is based upon published
     * specs from sandisk and from what people have reported.
     */
    switch (card->csd.mmca_vsn) {
    case 0: /* MMC v1.0 - v1.2 */
    case 1: /* MMC v1.4 */
        card->cid.manfid    = UNSTUFF_BITS(resp, 104, 24);
        card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
        card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
        card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
        card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
        card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
        card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
        card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
        card->cid.hwrev     = UNSTUFF_BITS(resp, 44, 4);
        card->cid.fwrev     = UNSTUFF_BITS(resp, 40, 4);
        card->cid.serial    = UNSTUFF_BITS(resp, 16, 24);
        card->cid.month     = UNSTUFF_BITS(resp, 12, 4);
        card->cid.year      = UNSTUFF_BITS(resp, 8, 4) + 1997;
        break;

    case 2: /* MMC v2.0 - v2.2 */
    case 3: /* MMC v3.1 - v3.3 */
    case 4: /* MMC v4 */
        card->cid.manfid    = UNSTUFF_BITS(resp, 120, 8);
        card->cid.oemid     = UNSTUFF_BITS(resp, 104, 16);
        card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
        card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
        card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
        card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
        card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
        card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
        card->cid.serial    = UNSTUFF_BITS(resp, 16, 32);
        card->cid.month     = UNSTUFF_BITS(resp, 12, 4);
        card->cid.year      = UNSTUFF_BITS(resp, 8, 4) + 1997;
        break;

    default:
        pr_err("%s: card has unknown MMCA version %d\n",
            mmc_hostname(card->host), card->csd.mmca_vsn);
        return -EINVAL;
    }

    return 0;
}

static void mmc_set_erase_size(struct mmc_card *card)
{
    if (card->ext_csd.erase_group_def & 1)
        card->erase_size = card->ext_csd.hc_erase_size;
    else
        card->erase_size = card->csd.erase_size;

    mmc_init_erase(card);
}

/*
 * Given a 128-bit response, decode to our card CSD structure.
 */
static int mmc_decode_csd(struct mmc_card *card)
{
    struct mmc_csd *csd = &card->csd;
    unsigned int e, m, a, b;
    u32 *resp = card->raw_csd;

    /*
     * We only understand CSD structure v1.1 and v1.2.
     * v1.2 has extra information in bits 15, 11 and 10.
     * We also support eMMC v4.4 & v4.41.
     */
    csd->structure = UNSTUFF_BITS(resp, 126, 2);
    if (csd->structure == 0) {
        pr_err("%s: unrecognised CSD structure version %d\n",
            mmc_hostname(card->host), csd->structure);
        return -EINVAL;
    }

    csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
    m = UNSTUFF_BITS(resp, 115, 4);
    e = UNSTUFF_BITS(resp, 112, 3);
    csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
    csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;

    m = UNSTUFF_BITS(resp, 99, 4);
    e = UNSTUFF_BITS(resp, 96, 3);
    csd->max_dtr      = tran_exp[e] * tran_mant[m];
    csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);

    e = UNSTUFF_BITS(resp, 47, 3);
    m = UNSTUFF_BITS(resp, 62, 12);
    csd->capacity     = (1 + m) << (e + 2);

    csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
    csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
    csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
    csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
    csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
    csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
    csd->write_partial = UNSTUFF_BITS(resp, 21, 1);

    if (csd->write_blkbits >= 9) {
        a = UNSTUFF_BITS(resp, 42, 5);
        b = UNSTUFF_BITS(resp, 37, 5);
        csd->erase_size = (a + 1) * (b + 1);
        csd->erase_size <<= csd->write_blkbits - 9;
    }

    return 0;
}

/*
 * Read extended CSD.
 */
static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
{
    int err;
    u8 *ext_csd;

    BUG_ON(!card);
    BUG_ON(!new_ext_csd);

    *new_ext_csd = NULL;

    if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
        return 0;

    /*
     * As the ext_csd is so large and mostly unused, we don't store the
     * raw block in mmc_card.
     */
    ext_csd = kmalloc(512, GFP_KERNEL);
    if (!ext_csd) {
        pr_err("%s: could not allocate a buffer to "
            "receive the ext_csd.\n", mmc_hostname(card->host));
        return -ENOMEM;
    }

    err = mmc_send_ext_csd(card, ext_csd);
    if (err) {
        kfree(ext_csd);
        *new_ext_csd = NULL;

        /* If the host or the card can't do the switch,
         * fail more gracefully. */
        if ((err != -EINVAL)
         && (err != -ENOSYS)
         && (err != -EFAULT))
            return err;

        /*
         * High capacity cards should have this "magic" size
         * stored in their CSD.
         */
        if (card->csd.capacity == (4096 * 512)) {
            pr_err("%s: unable to read EXT_CSD "
                "on a possible high capacity card. "
                "Card will be ignored.\n",
                mmc_hostname(card->host));
        } else {
            pr_warning("%s: unable to read "
                "EXT_CSD, performance might "
                "suffer.\n",
                mmc_hostname(card->host));
            err = 0;
        }
    } else
        *new_ext_csd = ext_csd;

    return err;
}

static void mmc_select_card_type(struct mmc_card *card)
{
    struct mmc_host *host = card->host;
    u8 card_type = card->ext_csd.raw_card_type & EXT_CSD_CARD_TYPE_MASK;
    unsigned int caps = host->caps, caps2 = host->caps2;
    unsigned int hs_max_dtr = 0;

    if (card_type & EXT_CSD_CARD_TYPE_26)
        hs_max_dtr = MMC_HIGH_26_MAX_DTR;

    if (caps & MMC_CAP_MMC_HIGHSPEED &&
            card_type & EXT_CSD_CARD_TYPE_52)
        hs_max_dtr = MMC_HIGH_52_MAX_DTR;

    if ((caps & MMC_CAP_1_8V_DDR &&
            card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) ||
        (caps & MMC_CAP_1_2V_DDR &&
            card_type & EXT_CSD_CARD_TYPE_DDR_1_2V))
        hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;

    if ((caps2 & MMC_CAP2_HS200_1_8V_SDR &&
            card_type & EXT_CSD_CARD_TYPE_SDR_1_8V) ||
        (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
            card_type & EXT_CSD_CARD_TYPE_SDR_1_2V))
        hs_max_dtr = MMC_HS200_MAX_DTR;

    card->ext_csd.hs_max_dtr = hs_max_dtr;
    card->ext_csd.card_type = card_type;
}

/*
 * Decode extended CSD.
 */
static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
{
    int err = 0, idx;
    unsigned int part_size;
    u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;

    BUG_ON(!card);

    if (!ext_csd)
        return 0;

    /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
    card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
    if (card->csd.structure == 3) {
        if (card->ext_csd.raw_ext_csd_structure > 2) {
            pr_err("%s: unrecognised EXT_CSD structure "
                "version %d\n", mmc_hostname(card->host),
                    card->ext_csd.raw_ext_csd_structure);
            err = -EINVAL;
            goto out;
        }
    }

    card->ext_csd.rev = ext_csd[EXT_CSD_REV];
    if (card->ext_csd.rev > 6) {
        pr_err("%s: unrecognised EXT_CSD revision %d\n",
            mmc_hostname(card->host), card->ext_csd.rev);
        err = -EINVAL;
        goto out;
    }

    card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
    card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
    card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
    card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
    if (card->ext_csd.rev >= 2) {
        card->ext_csd.sectors =
            ext_csd[EXT_CSD_SEC_CNT + 0] << 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;

        /* Cards with density > 2GiB are sector addressed */
        if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
            mmc_card_set_blockaddr(card);
    }

    card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
    mmc_select_card_type(card);

    card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
    card->ext_csd.raw_erase_timeout_mult =
        ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
    card->ext_csd.raw_hc_erase_grp_size =
        ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
    if (card->ext_csd.rev >= 3) {
        u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
        card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];

        /* EXT_CSD value is in units of 10ms, but we store in ms */
        card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];

        /* Sleep / awake timeout in 100ns units */
        if (sa_shift > 0 && sa_shift <= 0x17)
            card->ext_csd.sa_timeout =
                    1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
        card->ext_csd.erase_group_def =
            ext_csd[EXT_CSD_ERASE_GROUP_DEF];
        card->ext_csd.hc_erase_timeout = 300 *
            ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
        card->ext_csd.hc_erase_size =
            ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;

        card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];

        /*
         * There are two boot regions of equal size, defined in
         * multiples of 128K.
         */
        if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
            for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
                part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
                mmc_part_add(card, part_size,
                    EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
                    "boot%d", idx, true,
                    MMC_BLK_DATA_AREA_BOOT);
            }
        }
    }

    card->ext_csd.raw_hc_erase_gap_size =
        ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
    card->ext_csd.raw_sec_trim_mult =
        ext_csd[EXT_CSD_SEC_TRIM_MULT];
    card->ext_csd.raw_sec_erase_mult =
        ext_csd[EXT_CSD_SEC_ERASE_MULT];
    card->ext_csd.raw_sec_feature_support =
        ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
    card->ext_csd.raw_trim_mult =
        ext_csd[EXT_CSD_TRIM_MULT];
    if (card->ext_csd.rev >= 4) {
        /*
         * Enhanced area feature support -- check whether the eMMC
         * card has the Enhanced area enabled.  If so, export enhanced
         * area offset and size to user by adding sysfs interface.
         */
        card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
        if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
            (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
            hc_erase_grp_sz =
                ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
            hc_wp_grp_sz =
                ext_csd[EXT_CSD_HC_WP_GRP_SIZE];

            card->ext_csd.enhanced_area_en = 1;
            /*
             * calculate the enhanced data area offset, in bytes
             */
            card->ext_csd.enhanced_area_offset =
                (ext_csd[139] << 24) + (ext_csd[138] << 16) +
                (ext_csd[137] << 8) + ext_csd[136];
            if (mmc_card_blockaddr(card))
                card->ext_csd.enhanced_area_offset <<= 9;
            /*
             * calculate the enhanced data area size, in kilobytes
             */
            card->ext_csd.enhanced_area_size =
                (ext_csd[142] << 16) + (ext_csd[141] << 8) +
                ext_csd[140];
            card->ext_csd.enhanced_area_size *=
                (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
            card->ext_csd.enhanced_area_size <<= 9;
        } else {
            /*
             * If the enhanced area is not enabled, disable these
             * device attributes.
             */
            card->ext_csd.enhanced_area_offset = -EINVAL;
            card->ext_csd.enhanced_area_size = -EINVAL;
        }

        /*
         * General purpose partition feature support --
         * If ext_csd has the size of general purpose partitions,
         * set size, part_cfg, partition name in mmc_part.
         */
        if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
            EXT_CSD_PART_SUPPORT_PART_EN) {
            if (card->ext_csd.enhanced_area_en != 1) {
                hc_erase_grp_sz =
                    ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
                hc_wp_grp_sz =
                    ext_csd[EXT_CSD_HC_WP_GRP_SIZE];

                card->ext_csd.enhanced_area_en = 1;
            }

            for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
                if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
                !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
                !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
                    continue;
                part_size =
                (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
                    << 16) +
                (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
                    << 8) +
                ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
                part_size *= (size_t)(hc_erase_grp_sz *
                    hc_wp_grp_sz);
                mmc_part_add(card, part_size << 19,
                    EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
                    "gp%d", idx, false,
                    MMC_BLK_DATA_AREA_GP);
            }
        }
        card->ext_csd.sec_trim_mult =
            ext_csd[EXT_CSD_SEC_TRIM_MULT];
        card->ext_csd.sec_erase_mult =
            ext_csd[EXT_CSD_SEC_ERASE_MULT];
        card->ext_csd.sec_feature_support =
            ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
        card->ext_csd.trim_timeout = 300 *
            ext_csd[EXT_CSD_TRIM_MULT];

        /*
         * Note that the call to mmc_part_add above defaults to read
         * only. If this default assumption is changed, the call must
         * take into account the value of boot_locked below.
         */
        card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
        card->ext_csd.boot_ro_lockable = true;
    }

    if (card->ext_csd.rev >= 5) {
        /* check whether the eMMC card supports BKOPS */
        if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
            card->ext_csd.bkops = 1;
            card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
            card->ext_csd.raw_bkops_status =
                ext_csd[EXT_CSD_BKOPS_STATUS];
            if (!card->ext_csd.bkops_en)
                pr_info("%s: BKOPS_EN bit is not set\n",
                    mmc_hostname(card->host));
        }

        /* check whether the eMMC card supports HPI */
        if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
            card->ext_csd.hpi = 1;
            if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
                card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
            else
                card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
            /*
             * Indicate the maximum timeout to close
             * a command interrupted by HPI
             */
            card->ext_csd.out_of_int_time =
                ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
        }

        card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
        card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
    }

    card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
    if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
        card->erased_byte = 0xFF;
    else
        card->erased_byte = 0x0;

    /* eMMC v4.5 or later */
    if (card->ext_csd.rev >= 6) {
        card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;

        card->ext_csd.generic_cmd6_time = 10 *
            ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
        card->ext_csd.power_off_longtime = 10 *
            ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];

        card->ext_csd.cache_size =
            ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
            ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
            ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
            ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;

        if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
            card->ext_csd.data_sector_size = 4096;
        else
            card->ext_csd.data_sector_size = 512;

        if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
            (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
            card->ext_csd.data_tag_unit_size =
            ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
            (card->ext_csd.data_sector_size);
        } else {
            card->ext_csd.data_tag_unit_size = 0;
        }
    } else {
        card->ext_csd.data_sector_size = 512;
    }

out:
    return err;
}

static inline void mmc_free_ext_csd(u8 *ext_csd)
{
    kfree(ext_csd);
}


static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
{
    u8 *bw_ext_csd;
    int err;

    if (bus_width == MMC_BUS_WIDTH_1)
        return 0;

    err = mmc_get_ext_csd(card, &bw_ext_csd);

    if (err || bw_ext_csd == NULL) {
        err = -EINVAL;
        goto out;
    }

    /* only compare read only fields */
    err = !((card->ext_csd.raw_partition_support ==
            bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
        (card->ext_csd.raw_erased_mem_count ==
            bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
        (card->ext_csd.rev ==
            bw_ext_csd[EXT_CSD_REV]) &&
        (card->ext_csd.raw_ext_csd_structure ==
            bw_ext_csd[EXT_CSD_STRUCTURE]) &&
        (card->ext_csd.raw_card_type ==
            bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
        (card->ext_csd.raw_s_a_timeout ==
            bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
        (card->ext_csd.raw_hc_erase_gap_size ==
            bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
        (card->ext_csd.raw_erase_timeout_mult ==
            bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
        (card->ext_csd.raw_hc_erase_grp_size ==
            bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
        (card->ext_csd.raw_sec_trim_mult ==
            bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
        (card->ext_csd.raw_sec_erase_mult ==
            bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
        (card->ext_csd.raw_sec_feature_support ==
            bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
        (card->ext_csd.raw_trim_mult ==
            bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
        (card->ext_csd.raw_sectors[0] ==
            bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
        (card->ext_csd.raw_sectors[1] ==
            bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
        (card->ext_csd.raw_sectors[2] ==
            bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
        (card->ext_csd.raw_sectors[3] ==
            bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
    if (err)
        err = -EINVAL;

out:
    mmc_free_ext_csd(bw_ext_csd);
    return err;
}

MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
    card->raw_cid[2], card->raw_cid[3]);
MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
    card->raw_csd[2], card->raw_csd[3]);
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
        card->ext_csd.enhanced_area_offset);
MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);

static struct attribute *mmc_std_attrs[] = {
    &dev_attr_cid.attr,
    &dev_attr_csd.attr,
    &dev_attr_date.attr,
    &dev_attr_erase_size.attr,
    &dev_attr_preferred_erase_size.attr,
    &dev_attr_fwrev.attr,
    &dev_attr_hwrev.attr,
    &dev_attr_manfid.attr,
    &dev_attr_name.attr,
    &dev_attr_oemid.attr,
    &dev_attr_serial.attr,
    &dev_attr_enhanced_area_offset.attr,
    &dev_attr_enhanced_area_size.attr,
    NULL,
};

static struct attribute_group mmc_std_attr_group = {
    .attrs = mmc_std_attrs,
};

static const struct attribute_group *mmc_attr_groups[] = {
    &mmc_std_attr_group,
    NULL,
};

static struct device_type mmc_type = {
    .groups = mmc_attr_groups,
};

/*
 * Select the PowerClass for the current bus width
 * If power class is defined for 4/8 bit bus in the
 * extended CSD register, select it by executing the
 * mmc_switch command.
 */
static int mmc_select_powerclass(struct mmc_card *card,
        unsigned int bus_width, u8 *ext_csd)
{
    int err = 0;
    unsigned int pwrclass_val;
    unsigned int index = 0;
    struct mmc_host *host;

    BUG_ON(!card);

    host = card->host;
    BUG_ON(!host);

    if (ext_csd == NULL)
        return 0;

    /* Power class selection is supported for versions >= 4.0 */
    if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
        return 0;

    /* Power class values are defined only for 4/8 bit bus */
    if (bus_width == EXT_CSD_BUS_WIDTH_1)
        return 0;

    switch (1 << host->ios.vdd) {
    case MMC_VDD_165_195:
        if (host->ios.clock <= 26000000)
            index = EXT_CSD_PWR_CL_26_195;
        else if (host->ios.clock <= 52000000)
            index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
                EXT_CSD_PWR_CL_52_195 :
                EXT_CSD_PWR_CL_DDR_52_195;
        else if (host->ios.clock <= 200000000)
            index = EXT_CSD_PWR_CL_200_195;
        break;
    case MMC_VDD_27_28:
    case MMC_VDD_28_29:
    case MMC_VDD_29_30:
    case MMC_VDD_30_31:
    case MMC_VDD_31_32:
    case MMC_VDD_32_33:
    case MMC_VDD_33_34:
    case MMC_VDD_34_35:
    case MMC_VDD_35_36:
        if (host->ios.clock <= 26000000)
            index = EXT_CSD_PWR_CL_26_360;
        else if (host->ios.clock <= 52000000)
            index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
                EXT_CSD_PWR_CL_52_360 :
                EXT_CSD_PWR_CL_DDR_52_360;
        else if (host->ios.clock <= 200000000)
            index = EXT_CSD_PWR_CL_200_360;
        break;
    default:
        pr_warning("%s: Voltage range not supported "
               "for power class.\n", mmc_hostname(host));
        return -EINVAL;
    }

    pwrclass_val = ext_csd[index];

    if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
        pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
                EXT_CSD_PWR_CL_8BIT_SHIFT;
    else
        pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
                EXT_CSD_PWR_CL_4BIT_SHIFT;

    /* If the power class is different from the default value */
    if (pwrclass_val > 0) {
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                 EXT_CSD_POWER_CLASS,
                 pwrclass_val,
                 card->ext_csd.generic_cmd6_time);
    }

    return err;
}

/*
 * Selects the desired buswidth and switch to the HS200 mode
 * if bus width set without error
 */
static int mmc_select_hs200(struct mmc_card *card)
{
    int idx, err = -EINVAL;
    struct mmc_host *host;
    static unsigned ext_csd_bits[] = {
        EXT_CSD_BUS_WIDTH_4,
        EXT_CSD_BUS_WIDTH_8,
    };
    static unsigned bus_widths[] = {
        MMC_BUS_WIDTH_4,
        MMC_BUS_WIDTH_8,
    };

    BUG_ON(!card);

    host = card->host;

    if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&
            host->caps2 & MMC_CAP2_HS200_1_2V_SDR)
        err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0);

    if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&
            host->caps2 & MMC_CAP2_HS200_1_8V_SDR)
        err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0);

    /* If fails try again during next card power cycle */
    if (err)
        goto err;

    idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 1 : 0;

    /*
     * Unlike SD, MMC cards dont have a configuration register to notify
     * supported bus width. So bus test command should be run to identify
     * the supported bus width or compare the ext csd values of current
     * bus width and ext csd values of 1 bit mode read earlier.
     */
    for (; idx >= 0; idx--) {

        /*
         * Host is capable of 8bit transfer, then switch
         * the device to work in 8bit transfer mode. If the
         * mmc switch command returns error then switch to
         * 4bit transfer mode. On success set the corresponding
         * bus width on the host.
         */
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                 EXT_CSD_BUS_WIDTH,
                 ext_csd_bits[idx],
                 card->ext_csd.generic_cmd6_time);
        if (err)
            continue;

        mmc_set_bus_width(card->host, bus_widths[idx]);

        if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
            err = mmc_compare_ext_csds(card, bus_widths[idx]);
        else
            err = mmc_bus_test(card, bus_widths[idx]);
        if (!err)
            break;
    }

    /* switch to HS200 mode if bus width set successfully */
    if (!err)
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                 EXT_CSD_HS_TIMING, 2, 0);
err:
    return err;
}

/*
 * Handle the detection and initialisation of a card.
 *
 * In the case of a resume, "oldcard" will contain the card
 * we're trying to reinitialise.
 */
static int mmc_init_card(struct mmc_host *host, u32 ocr,
    struct mmc_card *oldcard)
{
    struct mmc_card *card;
    int err, ddr = 0;
    u32 cid[4];
    unsigned int max_dtr;
    u32 rocr;
    u8 *ext_csd = NULL;

    BUG_ON(!host);
    WARN_ON(!host->claimed);

    /* Set correct bus mode for MMC before attempting init */
    if (!mmc_host_is_spi(host))
        mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);

    /*
     * Since we're changing the OCR value, we seem to
     * need to tell some cards to go back to the idle
     * state.  We wait 1ms to give cards time to
     * respond.
     * mmc_go_idle is needed for eMMC that are asleep
     */
    mmc_go_idle(host);

    /* The extra bit indicates that we support high capacity */
    err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
    if (err)
        goto err;

    /*
     * For SPI, enable CRC as appropriate.
     */
    if (mmc_host_is_spi(host)) {
        err = mmc_spi_set_crc(host, use_spi_crc);
        if (err)
            goto err;
    }

    /*
     * Fetch CID from card.
     */
    if (mmc_host_is_spi(host))
        err = mmc_send_cid(host, cid);
    else
        err = mmc_all_send_cid(host, cid);
    if (err)
        goto err;

    if (oldcard) {
        if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
            err = -ENOENT;
            goto err;
        }

        card = oldcard;
    } else {
        /*
         * Allocate card structure.
         */
        card = mmc_alloc_card(host, &mmc_type);
        if (IS_ERR(card)) {
            err = PTR_ERR(card);
            goto err;
        }

        card->type = MMC_TYPE_MMC;
        card->rca = 1;
        memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
    }

    /*
     * For native busses:  set card RCA and quit open drain mode.
     */
    if (!mmc_host_is_spi(host)) {
        err = mmc_set_relative_addr(card);
        if (err)
            goto free_card;

        mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
    }

    if (!oldcard) {
        /*
         * Fetch CSD from card.
         */
        err = mmc_send_csd(card, card->raw_csd);
        if (err)
            goto free_card;

        err = mmc_decode_csd(card);
        if (err)
            goto free_card;
        err = mmc_decode_cid(card);
        if (err)
            goto free_card;
    }

    /*
     * Select card, as all following commands rely on that.
     */
    if (!mmc_host_is_spi(host)) {
        err = mmc_select_card(card);
        if (err)
            goto free_card;
    }

    if (!oldcard) {
        /*
         * Fetch and process extended CSD.
         */

        err = mmc_get_ext_csd(card, &ext_csd);
        if (err)
            goto free_card;
        err = mmc_read_ext_csd(card, ext_csd);
        if (err)
            goto free_card;

        /* If doing byte addressing, check if required to do sector
         * addressing.  Handle the case of <2GB cards needing sector
         * addressing.  See section 8.1 JEDEC Standard JED84-A441;
         * ocr register has bit 30 set for sector addressing.
         */
        if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
            mmc_card_set_blockaddr(card);

        /* Erase size depends on CSD and Extended CSD */
        mmc_set_erase_size(card);
    }

    /*
     * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
     * bit.  This bit will be lost every time after a reset or power off.
     */
    if (card->ext_csd.enhanced_area_en ||
        (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                 EXT_CSD_ERASE_GROUP_DEF, 1,
                 card->ext_csd.generic_cmd6_time);

        if (err && err != -EBADMSG)
            goto free_card;

        if (err) {
            err = 0;
            /*
             * Just disable enhanced area off & sz
             * will try to enable ERASE_GROUP_DEF
             * during next time reinit
             */
            card->ext_csd.enhanced_area_offset = -EINVAL;
            card->ext_csd.enhanced_area_size = -EINVAL;
        } else {
            card->ext_csd.erase_group_def = 1;
            /*
             * enable ERASE_GRP_DEF successfully.
             * This will affect the erase size, so
             * here need to reset erase size
             */
            mmc_set_erase_size(card);
        }
    }

    /*
     * Ensure eMMC user default partition is enabled
     */
    if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
        card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
                 card->ext_csd.part_config,
                 card->ext_csd.part_time);
        if (err && err != -EBADMSG)
            goto free_card;
    }

    /*
     * If the host supports the power_off_notify capability then
     * set the notification byte in the ext_csd register of device
     */
    if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
        (card->ext_csd.rev >= 6)) {
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                 EXT_CSD_POWER_OFF_NOTIFICATION,
                 EXT_CSD_POWER_ON,
                 card->ext_csd.generic_cmd6_time);
        if (err && err != -EBADMSG)
            goto free_card;

        /*
         * The err can be -EBADMSG or 0,
         * so check for success and update the flag
         */
        if (!err)
            card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
    }

    /*
     * Activate high speed (if supported)
     */
    if (card->ext_csd.hs_max_dtr != 0) {
        err = 0;
        if (card->ext_csd.hs_max_dtr > 52000000 &&
            host->caps2 & MMC_CAP2_HS200)
            err = mmc_select_hs200(card);
        else if (host->caps & MMC_CAP_MMC_HIGHSPEED)
            err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                     EXT_CSD_HS_TIMING, 1,
                     card->ext_csd.generic_cmd6_time);

        if (err && err != -EBADMSG)
            goto free_card;

        if (err) {
            pr_warning("%s: switch to highspeed failed\n",
                   mmc_hostname(card->host));
            err = 0;
        } else {
            if (card->ext_csd.hs_max_dtr > 52000000 &&
                host->caps2 & MMC_CAP2_HS200) {
                mmc_card_set_hs200(card);
                mmc_set_timing(card->host,
                           MMC_TIMING_MMC_HS200);
            } else {
                mmc_card_set_highspeed(card);
                mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
            }
        }
    }

    /*
     * Compute bus speed.
     */
    max_dtr = (unsigned int)-1;

    if (mmc_card_highspeed(card) || mmc_card_hs200(card)) {
        if (max_dtr > card->ext_csd.hs_max_dtr)
            max_dtr = card->ext_csd.hs_max_dtr;
    } else if (max_dtr > card->csd.max_dtr) {
        max_dtr = card->csd.max_dtr;
    }

    mmc_set_clock(host, max_dtr);

    /*
     * Indicate DDR mode (if supported).
     */
    if (mmc_card_highspeed(card)) {
        if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
            && ((host->caps & (MMC_CAP_1_8V_DDR |
                 MMC_CAP_UHS_DDR50))
                == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
                ddr = MMC_1_8V_DDR_MODE;
        else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
            && ((host->caps & (MMC_CAP_1_2V_DDR |
                 MMC_CAP_UHS_DDR50))
                == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
                ddr = MMC_1_2V_DDR_MODE;
    }

    /*
     * Indicate HS200 SDR mode (if supported).
     */
    if (mmc_card_hs200(card)) {
        u32 ext_csd_bits;
        u32 bus_width = card->host->ios.bus_width;

        /*
         * For devices supporting HS200 mode, the bus width has
         * to be set before executing the tuning function. If
         * set before tuning, then device will respond with CRC
         * errors for responses on CMD line. So for HS200 the
         * sequence will be
         * 1. set bus width 4bit / 8 bit (1 bit not supported)
         * 2. switch to HS200 mode
         * 3. set the clock to > 52Mhz <=200MHz and
         * 4. execute tuning for HS200
         */
        if ((host->caps2 & MMC_CAP2_HS200) &&
            card->host->ops->execute_tuning) {
            mmc_host_clk_hold(card->host);
            err = card->host->ops->execute_tuning(card->host,
                MMC_SEND_TUNING_BLOCK_HS200);
            mmc_host_clk_release(card->host);
        }
        if (err) {
            pr_warning("%s: tuning execution failed\n",
                   mmc_hostname(card->host));
            goto err;
        }

        ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
                EXT_CSD_BUS_WIDTH_8 : EXT_CSD_BUS_WIDTH_4;
        err = mmc_select_powerclass(card, ext_csd_bits, ext_csd);
        if (err)
            pr_warning("%s: power class selection to bus width %d"
                   " failed\n", mmc_hostname(card->host),
                   1 << bus_width);
    }

    /*
     * Activate wide bus and DDR (if supported).
     */
    if (!mmc_card_hs200(card) &&
        (card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
        (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
        static unsigned ext_csd_bits[][2] = {
            { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
            { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
            { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
        };
        static unsigned bus_widths[] = {
            MMC_BUS_WIDTH_8,
            MMC_BUS_WIDTH_4,
            MMC_BUS_WIDTH_1
        };
        unsigned idx, bus_width = 0;

        if (host->caps & MMC_CAP_8_BIT_DATA)
            idx = 0;
        else
            idx = 1;
        for (; idx < ARRAY_SIZE(bus_widths); idx++) {
            bus_width = bus_widths[idx];
            if (bus_width == MMC_BUS_WIDTH_1)
                ddr = 0; /* no DDR for 1-bit width */
            err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
                            ext_csd);
            if (err)
                pr_warning("%s: power class selection to "
                       "bus width %d failed\n",
                       mmc_hostname(card->host),
                       1 << bus_width);

            err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                     EXT_CSD_BUS_WIDTH,
                     ext_csd_bits[idx][0],
                     card->ext_csd.generic_cmd6_time);
            if (!err) {
                mmc_set_bus_width(card->host, bus_width);

                /*
                 * If controller can't handle bus width test,
                 * compare ext_csd previously read in 1 bit mode
                 * against ext_csd at new bus width
                 */
                if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
                    err = mmc_compare_ext_csds(card,
                        bus_width);
                else
                    err = mmc_bus_test(card, bus_width);
                if (!err)
                    break;
            }
        }

        if (!err && ddr) {
            err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
                            ext_csd);
            if (err)
                pr_warning("%s: power class selection to "
                       "bus width %d ddr %d failed\n",
                       mmc_hostname(card->host),
                       1 << bus_width, ddr);

            err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                     EXT_CSD_BUS_WIDTH,
                     ext_csd_bits[idx][1],
                     card->ext_csd.generic_cmd6_time);
        }
        if (err) {
            pr_warning("%s: switch to bus width %d ddr %d "
                "failed\n", mmc_hostname(card->host),
                1 << bus_width, ddr);
            goto free_card;
        } else if (ddr) {
            /*
             * eMMC cards can support 3.3V to 1.2V i/o (vccq)
             * signaling.
             *
             * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
             *
             * 1.8V vccq at 3.3V core voltage (vcc) is not required
             * in the JEDEC spec for DDR.
             *
             * Do not force change in vccq since we are obviously
             * working and no change to vccq is needed.
             *
             * WARNING: eMMC rules are NOT the same as SD DDR
             */
            if (ddr == MMC_1_2V_DDR_MODE) {
                err = mmc_set_signal_voltage(host,
                    MMC_SIGNAL_VOLTAGE_120, 0);
                if (err)
                    goto err;
            }
            mmc_card_set_ddr_mode(card);
            mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
            mmc_set_bus_width(card->host, bus_width);
        }
    }

    /*
     * Enable HPI feature (if supported)
     */
    if (card->ext_csd.hpi) {
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                EXT_CSD_HPI_MGMT, 1,
                card->ext_csd.generic_cmd6_time);
        if (err && err != -EBADMSG)
            goto free_card;
        if (err) {
            pr_warning("%s: Enabling HPI failed\n",
                   mmc_hostname(card->host));
            err = 0;
        } else
            card->ext_csd.hpi_en = 1;
    }

    /*
     * If cache size is higher than 0, this indicates
     * the existence of cache and it can be turned on.
     */
    if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
            card->ext_csd.cache_size > 0) {
        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                EXT_CSD_CACHE_CTRL, 1,
                card->ext_csd.generic_cmd6_time);
        if (err && err != -EBADMSG)
            goto free_card;

        /*
         * Only if no error, cache is turned on successfully.
         */
        if (err) {
            pr_warning("%s: Cache is supported, "
                    "but failed to turn on (%d)\n",
                    mmc_hostname(card->host), err);
            card->ext_csd.cache_ctrl = 0;
            err = 0;
        } else {
            card->ext_csd.cache_ctrl = 1;
        }
    }

    if (!oldcard)
        host->card = card;

    mmc_free_ext_csd(ext_csd);
    return 0;

free_card:
    if (!oldcard)
        mmc_remove_card(card);
err:
    mmc_free_ext_csd(ext_csd);

    return err;
}

static int mmc_can_poweroff_notify(const struct mmc_card *card)
{
    return card &&
        mmc_card_mmc(card) &&
        (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
}

static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
{
    unsigned int timeout = card->ext_csd.generic_cmd6_time;
    int err;

    /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
    if (notify_type == EXT_CSD_POWER_OFF_LONG)
        timeout = card->ext_csd.power_off_longtime;

    err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
             EXT_CSD_POWER_OFF_NOTIFICATION,
             notify_type, timeout);
    if (err)
        pr_err("%s: Power Off Notification timed out, %u\n",
               mmc_hostname(card->host), timeout);

    /* Disable the power off notification after the switch operation. */
    card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;

    return err;
}

/*
 * Host is being removed. Free up the current card.
 */
static void mmc_remove(struct mmc_host *host)
{
    BUG_ON(!host);
    BUG_ON(!host->card);

    mmc_remove_card(host->card);
    host->card = NULL;
}

/*
 * Card detection - card is alive.
 */
static int mmc_alive(struct mmc_host *host)
{
    return mmc_send_status(host->card, NULL);
}

/*
 * Card detection callback from host.
 */
static void mmc_detect(struct mmc_host *host)
{
    int err;

    BUG_ON(!host);
    BUG_ON(!host->card);

    mmc_claim_host(host);

    /*
     * Just check if our card has been removed.
     */
    err = _mmc_detect_card_removed(host);

    mmc_release_host(host);

    if (err) {
        mmc_remove(host);

        mmc_claim_host(host);
        mmc_detach_bus(host);
        mmc_power_off(host);
        mmc_release_host(host);
    }
}

/*
 * Suspend callback from host.
 */
static int mmc_suspend(struct mmc_host *host)
{
    int err = 0;

    BUG_ON(!host);
    BUG_ON(!host->card);

    mmc_claim_host(host);
    if (mmc_can_poweroff_notify(host->card))
        err = mmc_poweroff_notify(host->card, EXT_CSD_POWER_OFF_SHORT);
    else if (mmc_card_can_sleep(host))
        err = mmc_card_sleep(host);
    else if (!mmc_host_is_spi(host))
        err = mmc_deselect_cards(host);
    host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
    mmc_release_host(host);

    return err;
}

/*
 * Resume callback from host.
 *
 * This function tries to determine if the same card is still present
 * and, if so, restore all state to it.
 */
static int mmc_resume(struct mmc_host *host)
{
    int err;

    BUG_ON(!host);
    BUG_ON(!host->card);

    mmc_claim_host(host);
    err = mmc_init_card(host, host->ocr, host->card);
    mmc_release_host(host);

    return err;
}

static int mmc_power_restore(struct mmc_host *host)
{
    int ret;

    host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
    mmc_claim_host(host);
    ret = mmc_init_card(host, host->ocr, host->card);
    mmc_release_host(host);

    return ret;
}

static int mmc_sleep(struct mmc_host *host)
{
    struct mmc_card *card = host->card;
    int err = -ENOSYS;

    if (card && card->ext_csd.rev >= 3) {
        err = mmc_card_sleepawake(host, 1);
        if (err < 0)
            pr_debug("%s: Error %d while putting card into sleep",
                 mmc_hostname(host), err);
    }

    return err;
}

static int mmc_awake(struct mmc_host *host)
{
    struct mmc_card *card = host->card;
    int err = -ENOSYS;

    if (card && card->ext_csd.rev >= 3) {
        err = mmc_card_sleepawake(host, 0);
        if (err < 0)
            pr_debug("%s: Error %d while awaking sleeping card",
                 mmc_hostname(host), err);
    }

    return err;
}

static const struct mmc_bus_ops mmc_ops = {
    .awake = mmc_awake,
    .sleep = mmc_sleep,
    .remove = mmc_remove,
    .detect = mmc_detect,
    .suspend = NULL,
    .resume = NULL,
    .power_restore = mmc_power_restore,
    .alive = mmc_alive,
};

static const struct mmc_bus_ops mmc_ops_unsafe = {
    .awake = mmc_awake,
    .sleep = mmc_sleep,
    .remove = mmc_remove,
    .detect = mmc_detect,
    .suspend = mmc_suspend,
    .resume = mmc_resume,
    .power_restore = mmc_power_restore,
    .alive = mmc_alive,
};

static void mmc_attach_bus_ops(struct mmc_host *host)
{
    const struct mmc_bus_ops *bus_ops;

    if (!mmc_card_is_removable(host))
        bus_ops = &mmc_ops_unsafe;
    else
        bus_ops = &mmc_ops;
    mmc_attach_bus(host, bus_ops);
}

/*
 * Starting point for MMC card init.
 */
int mmc_attach_mmc(struct mmc_host *host)
{
    int err;
    u32 ocr;

    BUG_ON(!host);
    WARN_ON(!host->claimed);

    /* Set correct bus mode for MMC before attempting attach */
    if (!mmc_host_is_spi(host))
        mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);

    err = mmc_send_op_cond(host, 0, &ocr);
    if (err)
        return err;

    mmc_attach_bus_ops(host);
    if (host->ocr_avail_mmc)
        host->ocr_avail = host->ocr_avail_mmc;

    /*
     * We need to get OCR a different way for SPI.
     */
    if (mmc_host_is_spi(host)) {
        err = mmc_spi_read_ocr(host, 1, &ocr);
        if (err)
            goto err;
    }

    /*
     * Sanity check the voltages that the card claims to
     * support.
     */
    if (ocr & 0x7F) {
        pr_warning("%s: card claims to support voltages "
               "below the defined range. These will be ignored.\n",
               mmc_hostname(host));
        ocr &= ~0x7F;
    }

    host->ocr = mmc_select_voltage(host, ocr);

    /*
     * Can we support the voltage of the card?
     */
    if (!host->ocr) {
        err = -EINVAL;
        goto err;
    }

    /*
     * Detect and init the card.
     */
    err = mmc_init_card(host, host->ocr, NULL);
    if (err)
        goto err;

    mmc_release_host(host);
    err = mmc_add_card(host->card);
    mmc_claim_host(host);
    if (err)
        goto remove_card;

    return 0;

remove_card:
    mmc_release_host(host);
    mmc_remove_card(host->card);
    mmc_claim_host(host);
    host->card = NULL;
err:
    mmc_detach_bus(host);

    pr_err("%s: error %d whilst initialising MMC card\n",
        mmc_hostname(host), err);

    return err;
}