linux/drivers/mmc/core/mmc.c
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   1/*
   2 *  linux/drivers/mmc/core/mmc.c
   3 *
   4 *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   5 *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   6 *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/err.h>
  14#include <linux/slab.h>
  15#include <linux/stat.h>
  16
  17#include <linux/mmc/host.h>
  18#include <linux/mmc/card.h>
  19#include <linux/mmc/mmc.h>
  20
  21#include "core.h"
  22#include "bus.h"
  23#include "mmc_ops.h"
  24#include "sd_ops.h"
  25
  26static const unsigned int tran_exp[] = {
  27        10000,          100000,         1000000,        10000000,
  28        0,              0,              0,              0
  29};
  30
  31static const unsigned char tran_mant[] = {
  32        0,      10,     12,     13,     15,     20,     25,     30,
  33        35,     40,     45,     50,     55,     60,     70,     80,
  34};
  35
  36static const unsigned int tacc_exp[] = {
  37        1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  38};
  39
  40static const unsigned int tacc_mant[] = {
  41        0,      10,     12,     13,     15,     20,     25,     30,
  42        35,     40,     45,     50,     55,     60,     70,     80,
  43};
  44
  45#define UNSTUFF_BITS(resp,start,size)                                   \
  46        ({                                                              \
  47                const int __size = size;                                \
  48                const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  49                const int __off = 3 - ((start) / 32);                   \
  50                const int __shft = (start) & 31;                        \
  51                u32 __res;                                              \
  52                                                                        \
  53                __res = resp[__off] >> __shft;                          \
  54                if (__size + __shft > 32)                               \
  55                        __res |= resp[__off-1] << ((32 - __shft) % 32); \
  56                __res & __mask;                                         \
  57        })
  58
  59/*
  60 * Given the decoded CSD structure, decode the raw CID to our CID structure.
  61 */
  62static int mmc_decode_cid(struct mmc_card *card)
  63{
  64        u32 *resp = card->raw_cid;
  65
  66        /*
  67         * The selection of the format here is based upon published
  68         * specs from sandisk and from what people have reported.
  69         */
  70        switch (card->csd.mmca_vsn) {
  71        case 0: /* MMC v1.0 - v1.2 */
  72        case 1: /* MMC v1.4 */
  73                card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  74                card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  75                card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  76                card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  77                card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  78                card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  79                card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  80                card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  81                card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  82                card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  83                card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  84                card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  85                card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  86                break;
  87
  88        case 2: /* MMC v2.0 - v2.2 */
  89        case 3: /* MMC v3.1 - v3.3 */
  90        case 4: /* MMC v4 */
  91                card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  92                card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  93                card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  94                card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  95                card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  96                card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  97                card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  98                card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  99                card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 100                card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 101                card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 102                break;
 103
 104        default:
 105                pr_err("%s: card has unknown MMCA version %d\n",
 106                        mmc_hostname(card->host), card->csd.mmca_vsn);
 107                return -EINVAL;
 108        }
 109
 110        return 0;
 111}
 112
 113static void mmc_set_erase_size(struct mmc_card *card)
 114{
 115        if (card->ext_csd.erase_group_def & 1)
 116                card->erase_size = card->ext_csd.hc_erase_size;
 117        else
 118                card->erase_size = card->csd.erase_size;
 119
 120        mmc_init_erase(card);
 121}
 122
 123/*
 124 * Given a 128-bit response, decode to our card CSD structure.
 125 */
 126static int mmc_decode_csd(struct mmc_card *card)
 127{
 128        struct mmc_csd *csd = &card->csd;
 129        unsigned int e, m, a, b;
 130        u32 *resp = card->raw_csd;
 131
 132        /*
 133         * We only understand CSD structure v1.1 and v1.2.
 134         * v1.2 has extra information in bits 15, 11 and 10.
 135         * We also support eMMC v4.4 & v4.41.
 136         */
 137        csd->structure = UNSTUFF_BITS(resp, 126, 2);
 138        if (csd->structure == 0) {
 139                pr_err("%s: unrecognised CSD structure version %d\n",
 140                        mmc_hostname(card->host), csd->structure);
 141                return -EINVAL;
 142        }
 143
 144        csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 145        m = UNSTUFF_BITS(resp, 115, 4);
 146        e = UNSTUFF_BITS(resp, 112, 3);
 147        csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 148        csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 149
 150        m = UNSTUFF_BITS(resp, 99, 4);
 151        e = UNSTUFF_BITS(resp, 96, 3);
 152        csd->max_dtr      = tran_exp[e] * tran_mant[m];
 153        csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 154
 155        e = UNSTUFF_BITS(resp, 47, 3);
 156        m = UNSTUFF_BITS(resp, 62, 12);
 157        csd->capacity     = (1 + m) << (e + 2);
 158
 159        csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 160        csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 161        csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 162        csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 163        csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 164        csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 165        csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 166
 167        if (csd->write_blkbits >= 9) {
 168                a = UNSTUFF_BITS(resp, 42, 5);
 169                b = UNSTUFF_BITS(resp, 37, 5);
 170                csd->erase_size = (a + 1) * (b + 1);
 171                csd->erase_size <<= csd->write_blkbits - 9;
 172        }
 173
 174        return 0;
 175}
 176
 177/*
 178 * Read extended CSD.
 179 */
 180static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 181{
 182        int err;
 183        u8 *ext_csd;
 184
 185        BUG_ON(!card);
 186        BUG_ON(!new_ext_csd);
 187
 188        *new_ext_csd = NULL;
 189
 190        if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 191                return 0;
 192
 193        /*
 194         * As the ext_csd is so large and mostly unused, we don't store the
 195         * raw block in mmc_card.
 196         */
 197        ext_csd = kmalloc(512, GFP_KERNEL);
 198        if (!ext_csd) {
 199                pr_err("%s: could not allocate a buffer to "
 200                        "receive the ext_csd.\n", mmc_hostname(card->host));
 201                return -ENOMEM;
 202        }
 203
 204        err = mmc_send_ext_csd(card, ext_csd);
 205        if (err) {
 206                kfree(ext_csd);
 207                *new_ext_csd = NULL;
 208
 209                /* If the host or the card can't do the switch,
 210                 * fail more gracefully. */
 211                if ((err != -EINVAL)
 212                 && (err != -ENOSYS)
 213                 && (err != -EFAULT))
 214                        return err;
 215
 216                /*
 217                 * High capacity cards should have this "magic" size
 218                 * stored in their CSD.
 219                 */
 220                if (card->csd.capacity == (4096 * 512)) {
 221                        pr_err("%s: unable to read EXT_CSD "
 222                                "on a possible high capacity card. "
 223                                "Card will be ignored.\n",
 224                                mmc_hostname(card->host));
 225                } else {
 226                        pr_warning("%s: unable to read "
 227                                "EXT_CSD, performance might "
 228                                "suffer.\n",
 229                                mmc_hostname(card->host));
 230                        err = 0;
 231                }
 232        } else
 233                *new_ext_csd = ext_csd;
 234
 235        return err;
 236}
 237
 238/*
 239 * Decode extended CSD.
 240 */
 241static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 242{
 243        int err = 0, idx;
 244        unsigned int part_size;
 245        u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 246
 247        BUG_ON(!card);
 248
 249        if (!ext_csd)
 250                return 0;
 251
 252        /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 253        card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 254        if (card->csd.structure == 3) {
 255                if (card->ext_csd.raw_ext_csd_structure > 2) {
 256                        pr_err("%s: unrecognised EXT_CSD structure "
 257                                "version %d\n", mmc_hostname(card->host),
 258                                        card->ext_csd.raw_ext_csd_structure);
 259                        err = -EINVAL;
 260                        goto out;
 261                }
 262        }
 263
 264        card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 265        if (card->ext_csd.rev > 6) {
 266                pr_err("%s: unrecognised EXT_CSD revision %d\n",
 267                        mmc_hostname(card->host), card->ext_csd.rev);
 268                err = -EINVAL;
 269                goto out;
 270        }
 271
 272        card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 273        card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 274        card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 275        card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 276        if (card->ext_csd.rev >= 2) {
 277                card->ext_csd.sectors =
 278                        ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 279                        ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 280                        ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 281                        ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 282
 283                /* Cards with density > 2GiB are sector addressed */
 284                if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 285                        mmc_card_set_blockaddr(card);
 286        }
 287        card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 288        switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 289        case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 290             EXT_CSD_CARD_TYPE_26:
 291                card->ext_csd.hs_max_dtr = 52000000;
 292                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
 293                break;
 294        case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
 295             EXT_CSD_CARD_TYPE_26:
 296                card->ext_csd.hs_max_dtr = 52000000;
 297                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
 298                break;
 299        case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
 300             EXT_CSD_CARD_TYPE_26:
 301                card->ext_csd.hs_max_dtr = 52000000;
 302                card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
 303                break;
 304        case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
 305                card->ext_csd.hs_max_dtr = 52000000;
 306                break;
 307        case EXT_CSD_CARD_TYPE_26:
 308                card->ext_csd.hs_max_dtr = 26000000;
 309                break;
 310        default:
 311                /* MMC v4 spec says this cannot happen */
 312                pr_warning("%s: card is mmc v4 but doesn't "
 313                        "support any high-speed modes.\n",
 314                        mmc_hostname(card->host));
 315        }
 316
 317        card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 318        card->ext_csd.raw_erase_timeout_mult =
 319                ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 320        card->ext_csd.raw_hc_erase_grp_size =
 321                ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 322        if (card->ext_csd.rev >= 3) {
 323                u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 324                card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 325
 326                /* EXT_CSD value is in units of 10ms, but we store in ms */
 327                card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 328
 329                /* Sleep / awake timeout in 100ns units */
 330                if (sa_shift > 0 && sa_shift <= 0x17)
 331                        card->ext_csd.sa_timeout =
 332                                        1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 333                card->ext_csd.erase_group_def =
 334                        ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 335                card->ext_csd.hc_erase_timeout = 300 *
 336                        ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 337                card->ext_csd.hc_erase_size =
 338                        ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 339
 340                card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 341
 342                /*
 343                 * There are two boot regions of equal size, defined in
 344                 * multiples of 128K.
 345                 */
 346                if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 347                        for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 348                                part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 349                                mmc_part_add(card, part_size,
 350                                        EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 351                                        "boot%d", idx, true);
 352                        }
 353                }
 354        }
 355
 356        card->ext_csd.raw_hc_erase_gap_size =
 357                ext_csd[EXT_CSD_PARTITION_ATTRIBUTE];
 358        card->ext_csd.raw_sec_trim_mult =
 359                ext_csd[EXT_CSD_SEC_TRIM_MULT];
 360        card->ext_csd.raw_sec_erase_mult =
 361                ext_csd[EXT_CSD_SEC_ERASE_MULT];
 362        card->ext_csd.raw_sec_feature_support =
 363                ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 364        card->ext_csd.raw_trim_mult =
 365                ext_csd[EXT_CSD_TRIM_MULT];
 366        if (card->ext_csd.rev >= 4) {
 367                /*
 368                 * Enhanced area feature support -- check whether the eMMC
 369                 * card has the Enhanced area enabled.  If so, export enhanced
 370                 * area offset and size to user by adding sysfs interface.
 371                 */
 372                card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 373                if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 374                    (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 375                        hc_erase_grp_sz =
 376                                ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 377                        hc_wp_grp_sz =
 378                                ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 379
 380                        card->ext_csd.enhanced_area_en = 1;
 381                        /*
 382                         * calculate the enhanced data area offset, in bytes
 383                         */
 384                        card->ext_csd.enhanced_area_offset =
 385                                (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 386                                (ext_csd[137] << 8) + ext_csd[136];
 387                        if (mmc_card_blockaddr(card))
 388                                card->ext_csd.enhanced_area_offset <<= 9;
 389                        /*
 390                         * calculate the enhanced data area size, in kilobytes
 391                         */
 392                        card->ext_csd.enhanced_area_size =
 393                                (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 394                                ext_csd[140];
 395                        card->ext_csd.enhanced_area_size *=
 396                                (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 397                        card->ext_csd.enhanced_area_size <<= 9;
 398                } else {
 399                        /*
 400                         * If the enhanced area is not enabled, disable these
 401                         * device attributes.
 402                         */
 403                        card->ext_csd.enhanced_area_offset = -EINVAL;
 404                        card->ext_csd.enhanced_area_size = -EINVAL;
 405                }
 406
 407                /*
 408                 * General purpose partition feature support --
 409                 * If ext_csd has the size of general purpose partitions,
 410                 * set size, part_cfg, partition name in mmc_part.
 411                 */
 412                if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 413                        EXT_CSD_PART_SUPPORT_PART_EN) {
 414                        if (card->ext_csd.enhanced_area_en != 1) {
 415                                hc_erase_grp_sz =
 416                                        ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 417                                hc_wp_grp_sz =
 418                                        ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 419
 420                                card->ext_csd.enhanced_area_en = 1;
 421                        }
 422
 423                        for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 424                                if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 425                                !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 426                                !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 427                                        continue;
 428                                part_size =
 429                                (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 430                                        << 16) +
 431                                (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 432                                        << 8) +
 433                                ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 434                                part_size *= (size_t)(hc_erase_grp_sz *
 435                                        hc_wp_grp_sz);
 436                                mmc_part_add(card, part_size << 19,
 437                                        EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 438                                        "gp%d", idx, false);
 439                        }
 440                }
 441                card->ext_csd.sec_trim_mult =
 442                        ext_csd[EXT_CSD_SEC_TRIM_MULT];
 443                card->ext_csd.sec_erase_mult =
 444                        ext_csd[EXT_CSD_SEC_ERASE_MULT];
 445                card->ext_csd.sec_feature_support =
 446                        ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 447                card->ext_csd.trim_timeout = 300 *
 448                        ext_csd[EXT_CSD_TRIM_MULT];
 449        }
 450
 451        if (card->ext_csd.rev >= 5) {
 452                /* check whether the eMMC card supports HPI */
 453                if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
 454                        card->ext_csd.hpi = 1;
 455                        if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 456                                card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 457                        else
 458                                card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 459                        /*
 460                         * Indicate the maximum timeout to close
 461                         * a command interrupted by HPI
 462                         */
 463                        card->ext_csd.out_of_int_time =
 464                                ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 465                }
 466
 467                card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 468                card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 469        }
 470
 471        card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 472        if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 473                card->erased_byte = 0xFF;
 474        else
 475                card->erased_byte = 0x0;
 476
 477        /* eMMC v4.5 or later */
 478        if (card->ext_csd.rev >= 6) {
 479                card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 480
 481                card->ext_csd.generic_cmd6_time = 10 *
 482                        ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 483                card->ext_csd.power_off_longtime = 10 *
 484                        ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 485
 486                card->ext_csd.cache_size =
 487                        ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 488                        ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 489                        ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 490                        ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 491        }
 492
 493out:
 494        return err;
 495}
 496
 497static inline void mmc_free_ext_csd(u8 *ext_csd)
 498{
 499        kfree(ext_csd);
 500}
 501
 502
 503static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 504{
 505        u8 *bw_ext_csd;
 506        int err;
 507
 508        if (bus_width == MMC_BUS_WIDTH_1)
 509                return 0;
 510
 511        err = mmc_get_ext_csd(card, &bw_ext_csd);
 512
 513        if (err || bw_ext_csd == NULL) {
 514                if (bus_width != MMC_BUS_WIDTH_1)
 515                        err = -EINVAL;
 516                goto out;
 517        }
 518
 519        if (bus_width == MMC_BUS_WIDTH_1)
 520                goto out;
 521
 522        /* only compare read only fields */
 523        err = (!(card->ext_csd.raw_partition_support ==
 524                        bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 525                (card->ext_csd.raw_erased_mem_count ==
 526                        bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 527                (card->ext_csd.rev ==
 528                        bw_ext_csd[EXT_CSD_REV]) &&
 529                (card->ext_csd.raw_ext_csd_structure ==
 530                        bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 531                (card->ext_csd.raw_card_type ==
 532                        bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 533                (card->ext_csd.raw_s_a_timeout ==
 534                        bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 535                (card->ext_csd.raw_hc_erase_gap_size ==
 536                        bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 537                (card->ext_csd.raw_erase_timeout_mult ==
 538                        bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 539                (card->ext_csd.raw_hc_erase_grp_size ==
 540                        bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 541                (card->ext_csd.raw_sec_trim_mult ==
 542                        bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 543                (card->ext_csd.raw_sec_erase_mult ==
 544                        bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 545                (card->ext_csd.raw_sec_feature_support ==
 546                        bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 547                (card->ext_csd.raw_trim_mult ==
 548                        bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 549                (card->ext_csd.raw_sectors[0] ==
 550                        bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 551                (card->ext_csd.raw_sectors[1] ==
 552                        bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 553                (card->ext_csd.raw_sectors[2] ==
 554                        bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 555                (card->ext_csd.raw_sectors[3] ==
 556                        bw_ext_csd[EXT_CSD_SEC_CNT + 3]));
 557        if (err)
 558                err = -EINVAL;
 559
 560out:
 561        mmc_free_ext_csd(bw_ext_csd);
 562        return err;
 563}
 564
 565MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 566        card->raw_cid[2], card->raw_cid[3]);
 567MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 568        card->raw_csd[2], card->raw_csd[3]);
 569MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 570MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 571MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 572MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 573MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 574MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 575MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 576MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 577MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 578MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 579                card->ext_csd.enhanced_area_offset);
 580MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 581
 582static struct attribute *mmc_std_attrs[] = {
 583        &dev_attr_cid.attr,
 584        &dev_attr_csd.attr,
 585        &dev_attr_date.attr,
 586        &dev_attr_erase_size.attr,
 587        &dev_attr_preferred_erase_size.attr,
 588        &dev_attr_fwrev.attr,
 589        &dev_attr_hwrev.attr,
 590        &dev_attr_manfid.attr,
 591        &dev_attr_name.attr,
 592        &dev_attr_oemid.attr,
 593        &dev_attr_serial.attr,
 594        &dev_attr_enhanced_area_offset.attr,
 595        &dev_attr_enhanced_area_size.attr,
 596        NULL,
 597};
 598
 599static struct attribute_group mmc_std_attr_group = {
 600        .attrs = mmc_std_attrs,
 601};
 602
 603static const struct attribute_group *mmc_attr_groups[] = {
 604        &mmc_std_attr_group,
 605        NULL,
 606};
 607
 608static struct device_type mmc_type = {
 609        .groups = mmc_attr_groups,
 610};
 611
 612/*
 613 * Select the PowerClass for the current bus width
 614 * If power class is defined for 4/8 bit bus in the
 615 * extended CSD register, select it by executing the
 616 * mmc_switch command.
 617 */
 618static int mmc_select_powerclass(struct mmc_card *card,
 619                unsigned int bus_width, u8 *ext_csd)
 620{
 621        int err = 0;
 622        unsigned int pwrclass_val;
 623        unsigned int index = 0;
 624        struct mmc_host *host;
 625
 626        BUG_ON(!card);
 627
 628        host = card->host;
 629        BUG_ON(!host);
 630
 631        if (ext_csd == NULL)
 632                return 0;
 633
 634        /* Power class selection is supported for versions >= 4.0 */
 635        if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 636                return 0;
 637
 638        /* Power class values are defined only for 4/8 bit bus */
 639        if (bus_width == EXT_CSD_BUS_WIDTH_1)
 640                return 0;
 641
 642        switch (1 << host->ios.vdd) {
 643        case MMC_VDD_165_195:
 644                if (host->ios.clock <= 26000000)
 645                        index = EXT_CSD_PWR_CL_26_195;
 646                else if (host->ios.clock <= 52000000)
 647                        index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 648                                EXT_CSD_PWR_CL_52_195 :
 649                                EXT_CSD_PWR_CL_DDR_52_195;
 650                else if (host->ios.clock <= 200000000)
 651                        index = EXT_CSD_PWR_CL_200_195;
 652                break;
 653        case MMC_VDD_32_33:
 654        case MMC_VDD_33_34:
 655        case MMC_VDD_34_35:
 656        case MMC_VDD_35_36:
 657                if (host->ios.clock <= 26000000)
 658                        index = EXT_CSD_PWR_CL_26_360;
 659                else if (host->ios.clock <= 52000000)
 660                        index = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 661                                EXT_CSD_PWR_CL_52_360 :
 662                                EXT_CSD_PWR_CL_DDR_52_360;
 663                else if (host->ios.clock <= 200000000)
 664                        index = EXT_CSD_PWR_CL_200_360;
 665                break;
 666        default:
 667                pr_warning("%s: Voltage range not supported "
 668                           "for power class.\n", mmc_hostname(host));
 669                return -EINVAL;
 670        }
 671
 672        pwrclass_val = ext_csd[index];
 673
 674        if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 675                pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 676                                EXT_CSD_PWR_CL_8BIT_SHIFT;
 677        else
 678                pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 679                                EXT_CSD_PWR_CL_4BIT_SHIFT;
 680
 681        /* If the power class is different from the default value */
 682        if (pwrclass_val > 0) {
 683                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 684                                 EXT_CSD_POWER_CLASS,
 685                                 pwrclass_val,
 686                                 card->ext_csd.generic_cmd6_time);
 687        }
 688
 689        return err;
 690}
 691
 692/*
 693 * Handle the detection and initialisation of a card.
 694 *
 695 * In the case of a resume, "oldcard" will contain the card
 696 * we're trying to reinitialise.
 697 */
 698static int mmc_init_card(struct mmc_host *host, u32 ocr,
 699        struct mmc_card *oldcard)
 700{
 701        struct mmc_card *card;
 702        int err, ddr = 0;
 703        u32 cid[4];
 704        unsigned int max_dtr;
 705        u32 rocr;
 706        u8 *ext_csd = NULL;
 707
 708        BUG_ON(!host);
 709        WARN_ON(!host->claimed);
 710
 711        /* Set correct bus mode for MMC before attempting init */
 712        if (!mmc_host_is_spi(host))
 713                mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
 714
 715        /*
 716         * Since we're changing the OCR value, we seem to
 717         * need to tell some cards to go back to the idle
 718         * state.  We wait 1ms to give cards time to
 719         * respond.
 720         * mmc_go_idle is needed for eMMC that are asleep
 721         */
 722        mmc_go_idle(host);
 723
 724        /* The extra bit indicates that we support high capacity */
 725        err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
 726        if (err)
 727                goto err;
 728
 729        /*
 730         * For SPI, enable CRC as appropriate.
 731         */
 732        if (mmc_host_is_spi(host)) {
 733                err = mmc_spi_set_crc(host, use_spi_crc);
 734                if (err)
 735                        goto err;
 736        }
 737
 738        /*
 739         * Fetch CID from card.
 740         */
 741        if (mmc_host_is_spi(host))
 742                err = mmc_send_cid(host, cid);
 743        else
 744                err = mmc_all_send_cid(host, cid);
 745        if (err)
 746                goto err;
 747
 748        if (oldcard) {
 749                if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 750                        err = -ENOENT;
 751                        goto err;
 752                }
 753
 754                card = oldcard;
 755        } else {
 756                /*
 757                 * Allocate card structure.
 758                 */
 759                card = mmc_alloc_card(host, &mmc_type);
 760                if (IS_ERR(card)) {
 761                        err = PTR_ERR(card);
 762                        goto err;
 763                }
 764
 765                card->type = MMC_TYPE_MMC;
 766                card->rca = 1;
 767                memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 768        }
 769
 770        /*
 771         * For native busses:  set card RCA and quit open drain mode.
 772         */
 773        if (!mmc_host_is_spi(host)) {
 774                err = mmc_set_relative_addr(card);
 775                if (err)
 776                        goto free_card;
 777
 778                mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
 779        }
 780
 781        if (!oldcard) {
 782                /*
 783                 * Fetch CSD from card.
 784                 */
 785                err = mmc_send_csd(card, card->raw_csd);
 786                if (err)
 787                        goto free_card;
 788
 789                err = mmc_decode_csd(card);
 790                if (err)
 791                        goto free_card;
 792                err = mmc_decode_cid(card);
 793                if (err)
 794                        goto free_card;
 795        }
 796
 797        /*
 798         * Select card, as all following commands rely on that.
 799         */
 800        if (!mmc_host_is_spi(host)) {
 801                err = mmc_select_card(card);
 802                if (err)
 803                        goto free_card;
 804        }
 805
 806        if (!oldcard) {
 807                /*
 808                 * Fetch and process extended CSD.
 809                 */
 810
 811                err = mmc_get_ext_csd(card, &ext_csd);
 812                if (err)
 813                        goto free_card;
 814                err = mmc_read_ext_csd(card, ext_csd);
 815                if (err)
 816                        goto free_card;
 817
 818                /* If doing byte addressing, check if required to do sector
 819                 * addressing.  Handle the case of <2GB cards needing sector
 820                 * addressing.  See section 8.1 JEDEC Standard JED84-A441;
 821                 * ocr register has bit 30 set for sector addressing.
 822                 */
 823                if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
 824                        mmc_card_set_blockaddr(card);
 825
 826                /* Erase size depends on CSD and Extended CSD */
 827                mmc_set_erase_size(card);
 828        }
 829
 830        /*
 831         * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
 832         * bit.  This bit will be lost every time after a reset or power off.
 833         */
 834        if (card->ext_csd.enhanced_area_en) {
 835                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 836                                 EXT_CSD_ERASE_GROUP_DEF, 1,
 837                                 card->ext_csd.generic_cmd6_time);
 838
 839                if (err && err != -EBADMSG)
 840                        goto free_card;
 841
 842                if (err) {
 843                        err = 0;
 844                        /*
 845                         * Just disable enhanced area off & sz
 846                         * will try to enable ERASE_GROUP_DEF
 847                         * during next time reinit
 848                         */
 849                        card->ext_csd.enhanced_area_offset = -EINVAL;
 850                        card->ext_csd.enhanced_area_size = -EINVAL;
 851                } else {
 852                        card->ext_csd.erase_group_def = 1;
 853                        /*
 854                         * enable ERASE_GRP_DEF successfully.
 855                         * This will affect the erase size, so
 856                         * here need to reset erase size
 857                         */
 858                        mmc_set_erase_size(card);
 859                }
 860        }
 861
 862        /*
 863         * Ensure eMMC user default partition is enabled
 864         */
 865        if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
 866                card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 867                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
 868                                 card->ext_csd.part_config,
 869                                 card->ext_csd.part_time);
 870                if (err && err != -EBADMSG)
 871                        goto free_card;
 872        }
 873
 874        /*
 875         * If the host supports the power_off_notify capability then
 876         * set the notification byte in the ext_csd register of device
 877         */
 878        if ((host->caps2 & MMC_CAP2_POWEROFF_NOTIFY) &&
 879            (card->ext_csd.rev >= 6)) {
 880                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 881                                 EXT_CSD_POWER_OFF_NOTIFICATION,
 882                                 EXT_CSD_POWER_ON,
 883                                 card->ext_csd.generic_cmd6_time);
 884                if (err && err != -EBADMSG)
 885                        goto free_card;
 886
 887                /*
 888                 * The err can be -EBADMSG or 0,
 889                 * so check for success and update the flag
 890                 */
 891                if (!err)
 892                        card->poweroff_notify_state = MMC_POWERED_ON;
 893        }
 894
 895        /*
 896         * Activate high speed (if supported)
 897         */
 898        if ((card->ext_csd.hs_max_dtr != 0) &&
 899                (host->caps & MMC_CAP_MMC_HIGHSPEED)) {
 900                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 901                                 EXT_CSD_HS_TIMING, 1,
 902                                 card->ext_csd.generic_cmd6_time);
 903                if (err && err != -EBADMSG)
 904                        goto free_card;
 905
 906                if (err) {
 907                        pr_warning("%s: switch to highspeed failed\n",
 908                               mmc_hostname(card->host));
 909                        err = 0;
 910                } else {
 911                        mmc_card_set_highspeed(card);
 912                        mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 913                }
 914        }
 915
 916        /*
 917         * Enable HPI feature (if supported)
 918         */
 919        if (card->ext_csd.hpi) {
 920                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 921                        EXT_CSD_HPI_MGMT, 1, 0);
 922                if (err && err != -EBADMSG)
 923                        goto free_card;
 924                if (err) {
 925                        pr_warning("%s: Enabling HPI failed\n",
 926                                   mmc_hostname(card->host));
 927                        err = 0;
 928                } else
 929                        card->ext_csd.hpi_en = 1;
 930        }
 931
 932        /*
 933         * Compute bus speed.
 934         */
 935        max_dtr = (unsigned int)-1;
 936
 937        if (mmc_card_highspeed(card)) {
 938                if (max_dtr > card->ext_csd.hs_max_dtr)
 939                        max_dtr = card->ext_csd.hs_max_dtr;
 940        } else if (max_dtr > card->csd.max_dtr) {
 941                max_dtr = card->csd.max_dtr;
 942        }
 943
 944        mmc_set_clock(host, max_dtr);
 945
 946        /*
 947         * Indicate DDR mode (if supported).
 948         */
 949        if (mmc_card_highspeed(card)) {
 950                if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
 951                        && ((host->caps & (MMC_CAP_1_8V_DDR |
 952                             MMC_CAP_UHS_DDR50))
 953                                == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
 954                                ddr = MMC_1_8V_DDR_MODE;
 955                else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
 956                        && ((host->caps & (MMC_CAP_1_2V_DDR |
 957                             MMC_CAP_UHS_DDR50))
 958                                == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
 959                                ddr = MMC_1_2V_DDR_MODE;
 960        }
 961
 962        /*
 963         * Activate wide bus and DDR (if supported).
 964         */
 965        if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
 966            (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) {
 967                static unsigned ext_csd_bits[][2] = {
 968                        { EXT_CSD_BUS_WIDTH_8, EXT_CSD_DDR_BUS_WIDTH_8 },
 969                        { EXT_CSD_BUS_WIDTH_4, EXT_CSD_DDR_BUS_WIDTH_4 },
 970                        { EXT_CSD_BUS_WIDTH_1, EXT_CSD_BUS_WIDTH_1 },
 971                };
 972                static unsigned bus_widths[] = {
 973                        MMC_BUS_WIDTH_8,
 974                        MMC_BUS_WIDTH_4,
 975                        MMC_BUS_WIDTH_1
 976                };
 977                unsigned idx, bus_width = 0;
 978
 979                if (host->caps & MMC_CAP_8_BIT_DATA)
 980                        idx = 0;
 981                else
 982                        idx = 1;
 983                for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 984                        bus_width = bus_widths[idx];
 985                        if (bus_width == MMC_BUS_WIDTH_1)
 986                                ddr = 0; /* no DDR for 1-bit width */
 987                        err = mmc_select_powerclass(card, ext_csd_bits[idx][0],
 988                                                    ext_csd);
 989                        if (err)
 990                                pr_err("%s: power class selection to "
 991                                       "bus width %d failed\n",
 992                                       mmc_hostname(card->host),
 993                                       1 << bus_width);
 994
 995                        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 996                                         EXT_CSD_BUS_WIDTH,
 997                                         ext_csd_bits[idx][0],
 998                                         card->ext_csd.generic_cmd6_time);
 999                        if (!err) {
1000                                mmc_set_bus_width(card->host, bus_width);
1001
1002                                /*
1003                                 * If controller can't handle bus width test,
1004                                 * compare ext_csd previously read in 1 bit mode
1005                                 * against ext_csd at new bus width
1006                                 */
1007                                if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1008                                        err = mmc_compare_ext_csds(card,
1009                                                bus_width);
1010                                else
1011                                        err = mmc_bus_test(card, bus_width);
1012                                if (!err)
1013                                        break;
1014                        }
1015                }
1016
1017                if (!err && ddr) {
1018                        err = mmc_select_powerclass(card, ext_csd_bits[idx][1],
1019                                                    ext_csd);
1020                        if (err)
1021                                pr_err("%s: power class selection to "
1022                                       "bus width %d ddr %d failed\n",
1023                                       mmc_hostname(card->host),
1024                                       1 << bus_width, ddr);
1025
1026                        err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1027                                         EXT_CSD_BUS_WIDTH,
1028                                         ext_csd_bits[idx][1],
1029                                         card->ext_csd.generic_cmd6_time);
1030                }
1031                if (err) {
1032                        pr_warning("%s: switch to bus width %d ddr %d "
1033                                "failed\n", mmc_hostname(card->host),
1034                                1 << bus_width, ddr);
1035                        goto free_card;
1036                } else if (ddr) {
1037                        /*
1038                         * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1039                         * signaling.
1040                         *
1041                         * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1042                         *
1043                         * 1.8V vccq at 3.3V core voltage (vcc) is not required
1044                         * in the JEDEC spec for DDR.
1045                         *
1046                         * Do not force change in vccq since we are obviously
1047                         * working and no change to vccq is needed.
1048                         *
1049                         * WARNING: eMMC rules are NOT the same as SD DDR
1050                         */
1051                        if (ddr == MMC_1_2V_DDR_MODE) {
1052                                err = mmc_set_signal_voltage(host,
1053                                        MMC_SIGNAL_VOLTAGE_120, 0);
1054                                if (err)
1055                                        goto err;
1056                        }
1057                        mmc_card_set_ddr_mode(card);
1058                        mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
1059                        mmc_set_bus_width(card->host, bus_width);
1060                }
1061        }
1062
1063        /*
1064         * If cache size is higher than 0, this indicates
1065         * the existence of cache and it can be turned on.
1066         */
1067        if ((host->caps2 & MMC_CAP2_CACHE_CTRL) &&
1068                        card->ext_csd.cache_size > 0) {
1069                err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1070                                EXT_CSD_CACHE_CTRL, 1, 0);
1071                if (err && err != -EBADMSG)
1072                        goto free_card;
1073
1074                /*
1075                 * Only if no error, cache is turned on successfully.
1076                 */
1077                card->ext_csd.cache_ctrl = err ? 0 : 1;
1078        }
1079
1080        if (!oldcard)
1081                host->card = card;
1082
1083        mmc_free_ext_csd(ext_csd);
1084        return 0;
1085
1086free_card:
1087        if (!oldcard)
1088                mmc_remove_card(card);
1089err:
1090        mmc_free_ext_csd(ext_csd);
1091
1092        return err;
1093}
1094
1095/*
1096 * Host is being removed. Free up the current card.
1097 */
1098static void mmc_remove(struct mmc_host *host)
1099{
1100        BUG_ON(!host);
1101        BUG_ON(!host->card);
1102
1103        mmc_remove_card(host->card);
1104        host->card = NULL;
1105}
1106
1107/*
1108 * Card detection callback from host.
1109 */
1110static void mmc_detect(struct mmc_host *host)
1111{
1112        int err;
1113
1114        BUG_ON(!host);
1115        BUG_ON(!host->card);
1116
1117        mmc_claim_host(host);
1118
1119        /*
1120         * Just check if our card has been removed.
1121         */
1122        err = mmc_send_status(host->card, NULL);
1123
1124        mmc_release_host(host);
1125
1126        if (err) {
1127                mmc_remove(host);
1128
1129                mmc_claim_host(host);
1130                mmc_detach_bus(host);
1131                mmc_power_off(host);
1132                mmc_release_host(host);
1133        }
1134}
1135
1136/*
1137 * Suspend callback from host.
1138 */
1139static int mmc_suspend(struct mmc_host *host)
1140{
1141        int err = 0;
1142
1143        BUG_ON(!host);
1144        BUG_ON(!host->card);
1145
1146        mmc_claim_host(host);
1147        if (mmc_card_can_sleep(host))
1148                err = mmc_card_sleep(host);
1149        else if (!mmc_host_is_spi(host))
1150                mmc_deselect_cards(host);
1151        host->card->state &= ~MMC_STATE_HIGHSPEED;
1152        mmc_release_host(host);
1153
1154        return err;
1155}
1156
1157/*
1158 * Resume callback from host.
1159 *
1160 * This function tries to determine if the same card is still present
1161 * and, if so, restore all state to it.
1162 */
1163static int mmc_resume(struct mmc_host *host)
1164{
1165        int err;
1166
1167        BUG_ON(!host);
1168        BUG_ON(!host->card);
1169
1170        mmc_claim_host(host);
1171        err = mmc_init_card(host, host->ocr, host->card);
1172        mmc_release_host(host);
1173
1174        return err;
1175}
1176
1177static int mmc_power_restore(struct mmc_host *host)
1178{
1179        int ret;
1180
1181        host->card->state &= ~MMC_STATE_HIGHSPEED;
1182        mmc_claim_host(host);
1183        ret = mmc_init_card(host, host->ocr, host->card);
1184        mmc_release_host(host);
1185
1186        return ret;
1187}
1188
1189static int mmc_sleep(struct mmc_host *host)
1190{
1191        struct mmc_card *card = host->card;
1192        int err = -ENOSYS;
1193
1194        if (card && card->ext_csd.rev >= 3) {
1195                err = mmc_card_sleepawake(host, 1);
1196                if (err < 0)
1197                        pr_debug("%s: Error %d while putting card into sleep",
1198                                 mmc_hostname(host), err);
1199        }
1200
1201        return err;
1202}
1203
1204static int mmc_awake(struct mmc_host *host)
1205{
1206        struct mmc_card *card = host->card;
1207        int err = -ENOSYS;
1208
1209        if (card && card->ext_csd.rev >= 3) {
1210                err = mmc_card_sleepawake(host, 0);
1211                if (err < 0)
1212                        pr_debug("%s: Error %d while awaking sleeping card",
1213                                 mmc_hostname(host), err);
1214        }
1215
1216        return err;
1217}
1218
1219static const struct mmc_bus_ops mmc_ops = {
1220        .awake = mmc_awake,
1221        .sleep = mmc_sleep,
1222        .remove = mmc_remove,
1223        .detect = mmc_detect,
1224        .suspend = NULL,
1225        .resume = NULL,
1226        .power_restore = mmc_power_restore,
1227};
1228
1229static const struct mmc_bus_ops mmc_ops_unsafe = {
1230        .awake = mmc_awake,
1231        .sleep = mmc_sleep,
1232        .remove = mmc_remove,
1233        .detect = mmc_detect,
1234        .suspend = mmc_suspend,
1235        .resume = mmc_resume,
1236        .power_restore = mmc_power_restore,
1237};
1238
1239static void mmc_attach_bus_ops(struct mmc_host *host)
1240{
1241        const struct mmc_bus_ops *bus_ops;
1242
1243        if (!mmc_card_is_removable(host))
1244                bus_ops = &mmc_ops_unsafe;
1245        else
1246                bus_ops = &mmc_ops;
1247        mmc_attach_bus(host, bus_ops);
1248}
1249
1250/*
1251 * Starting point for MMC card init.
1252 */
1253int mmc_attach_mmc(struct mmc_host *host)
1254{
1255        int err;
1256        u32 ocr;
1257
1258        BUG_ON(!host);
1259        WARN_ON(!host->claimed);
1260
1261        /* Set correct bus mode for MMC before attempting attach */
1262        if (!mmc_host_is_spi(host))
1263                mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1264
1265        err = mmc_send_op_cond(host, 0, &ocr);
1266        if (err)
1267                return err;
1268
1269        mmc_attach_bus_ops(host);
1270        if (host->ocr_avail_mmc)
1271                host->ocr_avail = host->ocr_avail_mmc;
1272
1273        /*
1274         * We need to get OCR a different way for SPI.
1275         */
1276        if (mmc_host_is_spi(host)) {
1277                err = mmc_spi_read_ocr(host, 1, &ocr);
1278                if (err)
1279                        goto err;
1280        }
1281
1282        /*
1283         * Sanity check the voltages that the card claims to
1284         * support.
1285         */
1286        if (ocr & 0x7F) {
1287                pr_warning("%s: card claims to support voltages "
1288                       "below the defined range. These will be ignored.\n",
1289                       mmc_hostname(host));
1290                ocr &= ~0x7F;
1291        }
1292
1293        host->ocr = mmc_select_voltage(host, ocr);
1294
1295        /*
1296         * Can we support the voltage of the card?
1297         */
1298        if (!host->ocr) {
1299                err = -EINVAL;
1300                goto err;
1301        }
1302
1303        /*
1304         * Detect and init the card.
1305         */
1306        err = mmc_init_card(host, host->ocr, NULL);
1307        if (err)
1308                goto err;
1309
1310        mmc_release_host(host);
1311        err = mmc_add_card(host->card);
1312        mmc_claim_host(host);
1313        if (err)
1314                goto remove_card;
1315
1316        return 0;
1317
1318remove_card:
1319        mmc_release_host(host);
1320        mmc_remove_card(host->card);
1321        mmc_claim_host(host);
1322        host->card = NULL;
1323err:
1324        mmc_detach_bus(host);
1325
1326        pr_err("%s: error %d whilst initialising MMC card\n",
1327                mmc_hostname(host), err);
1328
1329        return err;
1330}
1331
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