/*
 *  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.prv           = UNSTUFF_BITS(resp, 48, 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;
        u32 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 > 7) {
                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];
        card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
        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.
                 */
                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;

                /* Save power class values */
                card->ext_csd.raw_pwr_cl_52_195 =
                        ext_csd[EXT_CSD_PWR_CL_52_195];
                card->ext_csd.raw_pwr_cl_26_195 =
                        ext_csd[EXT_CSD_PWR_CL_26_195];
                card->ext_csd.raw_pwr_cl_52_360 =
                        ext_csd[EXT_CSD_PWR_CL_52_360];
                card->ext_csd.raw_pwr_cl_26_360 =
                        ext_csd[EXT_CSD_PWR_CL_26_360];
                card->ext_csd.raw_pwr_cl_200_195 =
                        ext_csd[EXT_CSD_PWR_CL_200_195];
                card->ext_csd.raw_pwr_cl_200_360 =
                        ext_csd[EXT_CSD_PWR_CL_200_360];
                card->ext_csd.raw_pwr_cl_ddr_52_195 =
                        ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
                card->ext_csd.raw_pwr_cl_ddr_52_360 =
                        ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
        }

        if (card->ext_csd.rev >= 5) {
                /* Adjust production date as per JEDEC JESD84-B451 */
                if (card->cid.year < 2010)
                        card->cid.year += 16;

                /* 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];

                /*
                 * RPMB regions are defined in multiples of 128K.
                 */
                card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
                if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
                        mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
                                EXT_CSD_PART_CONFIG_ACC_RPMB,
                                "rpmb", 0, false,
                                MMC_BLK_DATA_AREA_RPMB);
                }
        }

        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;
                }

                card->ext_csd.max_packed_writes =
                        ext_csd[EXT_CSD_MAX_PACKED_WRITES];
                card->ext_csd.max_packed_reads =
                        ext_csd[EXT_CSD_MAX_PACKED_READS];
        } 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]) &&
                (card->ext_csd.raw_pwr_cl_52_195 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
                (card->ext_csd.raw_pwr_cl_26_195 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
                (card->ext_csd.raw_pwr_cl_52_360 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
                (card->ext_csd.raw_pwr_cl_26_360 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
                (card->ext_csd.raw_pwr_cl_200_195 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
                (card->ext_csd.raw_pwr_cl_200_360 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
                (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
                (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
                        bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]));
        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(prv, "0x%x\n", card->cid.prv);
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);
MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);

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_prv.attr,
        &dev_attr_serial.attr,
        &dev_attr_enhanced_area_offset.attr,
        &dev_attr_enhanced_area_size.attr,
        &dev_attr_raw_rpmb_size_mult.attr,
        &dev_attr_rel_sectors.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)
{
        int err = 0;
        unsigned int pwrclass_val = 0;
        struct mmc_host *host;

        BUG_ON(!card);

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

        /* 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)
                        pwrclass_val = card->ext_csd.raw_pwr_cl_26_195;
                else if (host->ios.clock <= 52000000)
                        pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
                                card->ext_csd.raw_pwr_cl_52_195 :
                                card->ext_csd.raw_pwr_cl_ddr_52_195;
                else if (host->ios.clock <= 200000000)
                        pwrclass_val = card->ext_csd.raw_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)
                        pwrclass_val = card->ext_csd.raw_pwr_cl_26_360;
                else if (host->ios.clock <= 52000000)
                        pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
                                card->ext_csd.raw_pwr_cl_52_360 :
                                card->ext_csd.raw_pwr_cl_ddr_52_360;
                else if (host->ios.clock <= 200000000)
                        pwrclass_val = card->ext_csd.raw_pwr_cl_200_360;
                break;
        default:
                pr_warning("%s: Voltage range not supported "
                           "for power class.\n", mmc_hostname(host));
                return -EINVAL;
        }

        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);

        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);

        /* 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;
        }

        /*
         * Enable power_off_notification byte in the ext_csd register
         */
        if (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;
                if (mmc_card_highspeed(card) && (max_dtr > 52000000))
                        max_dtr = 52000000;
        } 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);
                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]);
                        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]);
                        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);
                                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;
                }
        }

        /*
         * The mandatory minimum values are defined for packed command.
         * read: 5, write: 3
         */
        if (card->ext_csd.max_packed_writes >= 3 &&
            card->ext_csd.max_packed_reads >= 5 &&
            host->caps2 & MMC_CAP2_PACKED_CMD) {
                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
                                EXT_CSD_EXP_EVENTS_CTRL,
                                EXT_CSD_PACKED_EVENT_EN,
                                card->ext_csd.generic_cmd6_time);
                if (err && err != -EBADMSG)
                        goto free_card;
                if (err) {
                        pr_warn("%s: Enabling packed event failed\n",
                                mmc_hostname(card->host));
                        card->ext_csd.packed_event_en = 0;
                        err = 0;
                } else {
                        card->ext_csd.packed_event_en = 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_sleep(struct mmc_card *card)
{
        return (card && card->ext_csd.rev >= 3);
}

static int mmc_sleep(struct mmc_host *host)
{
        struct mmc_command cmd = {0};
        struct mmc_card *card = host->card;
        int err;

        if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
                return 0;

        err = mmc_deselect_cards(host);
        if (err)
                return err;

        cmd.opcode = MMC_SLEEP_AWAKE;
        cmd.arg = card->rca << 16;
        cmd.arg |= 1 << 15;

        cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
        err = mmc_wait_for_cmd(host, &cmd, 0);
        if (err)
                return err;

        /*
         * If the host does not wait while the card signals busy, then we will
         * will have to wait the sleep/awake timeout.  Note, we cannot use the
         * SEND_STATUS command to poll the status because that command (and most
         * others) is invalid while the card sleeps.
         */
        if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
                mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));

        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_get_card(host->card);

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

        mmc_put_card(host->card);

        if (err) {
                mmc_remove(host);

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

static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
{
        int err = 0;
        unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
                                        EXT_CSD_POWER_OFF_LONG;

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

        mmc_claim_host(host);

        if (mmc_card_doing_bkops(host->card)) {
                err = mmc_stop_bkops(host->card);
                if (err)
                        goto out;
        }

        err = mmc_cache_ctrl(host, 0);
        if (err)
                goto out;

        if (mmc_can_poweroff_notify(host->card) &&
                ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
                err = mmc_poweroff_notify(host->card, notify_type);
        else if (mmc_can_sleep(host->card))
                err = mmc_sleep(host);
        else if (!mmc_host_is_spi(host))
                err = mmc_deselect_cards(host);
        host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);

        if (!err)
                mmc_power_off(host);
out:
        mmc_release_host(host);
        return err;
}

/*
 * Suspend callback from host.
 */
static int mmc_suspend(struct mmc_host *host)
{
        return _mmc_suspend(host, true);
}

/*
 * Shutdown callback
 */
static int mmc_shutdown(struct mmc_host *host)
{
        return _mmc_suspend(host, false);
}

/*
 * 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);
        mmc_power_up(host);
        mmc_select_voltage(host, host->ocr);
        err = mmc_init_card(host, host->ocr, host->card);
        mmc_release_host(host);

        return err;
}


/*
 * Callback for runtime_suspend.
 */
static int mmc_runtime_suspend(struct mmc_host *host)
{
        int err;

        if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
                return 0;

        mmc_claim_host(host);

        err = mmc_suspend(host);
        if (err) {
                pr_err("%s: error %d doing aggessive suspend\n",
                        mmc_hostname(host), err);
                goto out;
        }
        mmc_power_off(host);

out:
        mmc_release_host(host);
        return err;
}

/*
 * Callback for runtime_resume.
 */
static int mmc_runtime_resume(struct mmc_host *host)
{
        int err;

        if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
                return 0;

        mmc_claim_host(host);

        mmc_power_up(host);
        err = mmc_resume(host);
        if (err)
                pr_err("%s: error %d doing aggessive resume\n",
                        mmc_hostname(host), err);

        mmc_release_host(host);
        return 0;
}

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 const struct mmc_bus_ops mmc_ops = {
        .remove = mmc_remove,
        .detect = mmc_detect,
        .suspend = NULL,
        .resume = NULL,
        .power_restore = mmc_power_restore,
        .alive = mmc_alive,
        .shutdown = mmc_shutdown,
};

static const struct mmc_bus_ops mmc_ops_unsafe = {
        .remove = mmc_remove,
        .detect = mmc_detect,
        .suspend = mmc_suspend,
        .resume = mmc_resume,
        .runtime_suspend = mmc_runtime_suspend,
        .runtime_resume = mmc_runtime_resume,
        .power_restore = mmc_power_restore,
        .alive = mmc_alive,
        .shutdown = mmc_shutdown,
};

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;
}