drivers/mmc/core/mmc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/mmc/core/mmc.c
   4  *
   5  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   6  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   7  *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
   8  */
   9
  10 #include <linux/err.h>
  11 #include <linux/of.h>
  12 #include <linux/slab.h>
  13 #include <linux/stat.h>
  14 #include <linux/pm_runtime.h>
  15
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/mmc.h>
  19
  20 #include "core.h"
  21 #include "card.h"
  22 #include "host.h"
  23 #include "bus.h"
  24 #include "mmc_ops.h"
  25 #include "quirks.h"
  26 #include "sd_ops.h"
  27 #include "pwrseq.h"
  28
  29 #define DEFAULT_CMD6_TIMEOUT_MS 500
  30 #define MIN_CACHE_EN_TIMEOUT_MS 1600
  31
  32 static const unsigned int tran_exp[] = {
  33         10000,          100000,         1000000,        10000000,
  34         0,              0,              0,              0
  35 };
  36
  37 static const unsigned char tran_mant[] = {
  38         0,      10,     12,     13,     15,     20,     25,     30,
  39         35,     40,     45,     50,     55,     60,     70,     80,
  40 };
  41
  42 static const unsigned int taac_exp[] = {
  43         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  44 };
  45
  46 static const unsigned int taac_mant[] = {
  47         0,      10,     12,     13,     15,     20,     25,     30,
  48         35,     40,     45,     50,     55,     60,     70,     80,
  49 };
  50
  51 #define UNSTUFF_BITS(resp,start,size)                                   \
  52         ({                                                              \
  53                 const int __size = size;                                \
  54                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  55                 const int __off = 3 - ((start) / 32);                   \
  56                 const int __shft = (start) & 31;                        \
  57                 u32 __res;                                              \
  58                                                                         \
  59                 __res = resp[__off] >> __shft;                          \
  60                 if (__size + __shft > 32)                               \
  61                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  62                 __res & __mask;                                         \
  63         })
  64
  65 /*
  66  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  67  */
  68 static int mmc_decode_cid(struct mmc_card *card)
  69 {
  70         u32 *resp = card->raw_cid;
  71
  72         /*
  73          * The selection of the format here is based upon published
  74          * specs from sandisk and from what people have reported.
  75          */
  76         switch (card->csd.mmca_vsn) {
  77         case 0: /* MMC v1.0 - v1.2 */
  78         case 1: /* MMC v1.4 */
  79                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  80                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  81                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  82                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  83                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  84                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  85                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  86                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  87                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  88                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  89                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  90                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  91                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  92                 break;
  93
  94         case 2: /* MMC v2.0 - v2.2 */
  95         case 3: /* MMC v3.1 - v3.3 */
  96         case 4: /* MMC v4 */
  97                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  98                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  99                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
 100                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
 101                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
 102                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
 103                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
 104                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 105                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 106                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 107                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 108                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 109                 break;
 110
 111         default:
 112                 pr_err("%s: card has unknown MMCA version %d\n",
 113                         mmc_hostname(card->host), card->csd.mmca_vsn);
 114                 return -EINVAL;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void mmc_set_erase_size(struct mmc_card *card)
 121 {
 122         if (card->ext_csd.erase_group_def & 1)
 123                 card->erase_size = card->ext_csd.hc_erase_size;
 124         else
 125                 card->erase_size = card->csd.erase_size;
 126
 127         mmc_init_erase(card);
 128 }
 129
 130 /*
 131  * Given a 128-bit response, decode to our card CSD structure.
 132  */
 133 static int mmc_decode_csd(struct mmc_card *card)
 134 {
 135         struct mmc_csd *csd = &card->csd;
 136         unsigned int e, m, a, b;
 137         u32 *resp = card->raw_csd;
 138
 139         /*
 140          * We only understand CSD structure v1.1 and v1.2.
 141          * v1.2 has extra information in bits 15, 11 and 10.
 142          * We also support eMMC v4.4 & v4.41.
 143          */
 144         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 145         if (csd->structure == 0) {
 146                 pr_err("%s: unrecognised CSD structure version %d\n",
 147                         mmc_hostname(card->host), csd->structure);
 148                 return -EINVAL;
 149         }
 150
 151         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 152         m = UNSTUFF_BITS(resp, 115, 4);
 153         e = UNSTUFF_BITS(resp, 112, 3);
 154         csd->taac_ns     = (taac_exp[e] * taac_mant[m] + 9) / 10;
 155         csd->taac_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 156
 157         m = UNSTUFF_BITS(resp, 99, 4);
 158         e = UNSTUFF_BITS(resp, 96, 3);
 159         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 160         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 161
 162         e = UNSTUFF_BITS(resp, 47, 3);
 163         m = UNSTUFF_BITS(resp, 62, 12);
 164         csd->capacity     = (1 + m) << (e + 2);
 165
 166         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 167         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 168         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 169         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 170         csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 171         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 172         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 173         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 174
 175         if (csd->write_blkbits >= 9) {
 176                 a = UNSTUFF_BITS(resp, 42, 5);
 177                 b = UNSTUFF_BITS(resp, 37, 5);
 178                 csd->erase_size = (a + 1) * (b + 1);
 179                 csd->erase_size <<= csd->write_blkbits - 9;
 180         }
 181
 182         return 0;
 183 }
 184
 185 static void mmc_select_card_type(struct mmc_card *card)
 186 {
 187         struct mmc_host *host = card->host;
 188         u8 card_type = card->ext_csd.raw_card_type;
 189         u32 caps = host->caps, caps2 = host->caps2;
 190         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 191         unsigned int avail_type = 0;
 192
 193         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 194             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 195                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 196                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 197         }
 198
 199         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 200             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 201                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 202                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 203         }
 204
 205         if (caps & (MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR) &&
 206             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 207                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 208                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 209         }
 210
 211         if (caps & MMC_CAP_1_2V_DDR &&
 212             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 213                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 214                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 215         }
 216
 217         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 218             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 219                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 220                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 221         }
 222
 223         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 224             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 225                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 226                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 227         }
 228
 229         if (caps2 & MMC_CAP2_HS400_1_8V &&
 230             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 231                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 232                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 233         }
 234
 235         if (caps2 & MMC_CAP2_HS400_1_2V &&
 236             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 237                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 238                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 239         }
 240
 241         if ((caps2 & MMC_CAP2_HS400_ES) &&
 242             card->ext_csd.strobe_support &&
 243             (avail_type & EXT_CSD_CARD_TYPE_HS400))
 244                 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
 245
 246         card->ext_csd.hs_max_dtr = hs_max_dtr;
 247         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 248         card->mmc_avail_type = avail_type;
 249 }
 250
 251 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 252 {
 253         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 254
 255         /*
 256          * Disable these attributes by default
 257          */
 258         card->ext_csd.enhanced_area_offset = -EINVAL;
 259         card->ext_csd.enhanced_area_size = -EINVAL;
 260
 261         /*
 262          * Enhanced area feature support -- check whether the eMMC
 263          * card has the Enhanced area enabled.  If so, export enhanced
 264          * area offset and size to user by adding sysfs interface.
 265          */
 266         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 267             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 268                 if (card->ext_csd.partition_setting_completed) {
 269                         hc_erase_grp_sz =
 270                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 271                         hc_wp_grp_sz =
 272                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 273
 274                         /*
 275                          * calculate the enhanced data area offset, in bytes
 276                          */
 277                         card->ext_csd.enhanced_area_offset =
 278                                 (((unsigned long long)ext_csd[139]) << 24) +
 279                                 (((unsigned long long)ext_csd[138]) << 16) +
 280                                 (((unsigned long long)ext_csd[137]) << 8) +
 281                                 (((unsigned long long)ext_csd[136]));
 282                         if (mmc_card_blockaddr(card))
 283                                 card->ext_csd.enhanced_area_offset <<= 9;
 284                         /*
 285                          * calculate the enhanced data area size, in kilobytes
 286                          */
 287                         card->ext_csd.enhanced_area_size =
 288                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 289                                 ext_csd[140];
 290                         card->ext_csd.enhanced_area_size *=
 291                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 292                         card->ext_csd.enhanced_area_size <<= 9;
 293                 } else {
 294                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 295                                 mmc_hostname(card->host));
 296                 }
 297         }
 298 }
 299
 300 static void mmc_part_add(struct mmc_card *card, u64 size,
 301                          unsigned int part_cfg, char *name, int idx, bool ro,
 302                          int area_type)
 303 {
 304         card->part[card->nr_parts].size = size;
 305         card->part[card->nr_parts].part_cfg = part_cfg;
 306         sprintf(card->part[card->nr_parts].name, name, idx);
 307         card->part[card->nr_parts].force_ro = ro;
 308         card->part[card->nr_parts].area_type = area_type;
 309         card->nr_parts++;
 310 }
 311
 312 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 313 {
 314         int idx;
 315         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 316         u64 part_size;
 317
 318         /*
 319          * General purpose partition feature support --
 320          * If ext_csd has the size of general purpose partitions,
 321          * set size, part_cfg, partition name in mmc_part.
 322          */
 323         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 324             EXT_CSD_PART_SUPPORT_PART_EN) {
 325                 hc_erase_grp_sz =
 326                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 327                 hc_wp_grp_sz =
 328                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 329
 330                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 331                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 332                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 333                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 334                                 continue;
 335                         if (card->ext_csd.partition_setting_completed == 0) {
 336                                 pr_warn("%s: has partition size defined without partition complete\n",
 337                                         mmc_hostname(card->host));
 338                                 break;
 339                         }
 340                         part_size =
 341                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 342                                 << 16) +
 343                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 344                                 << 8) +
 345                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 346                         part_size *= (hc_erase_grp_sz * hc_wp_grp_sz);
 347                         mmc_part_add(card, part_size << 19,
 348                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 349                                 "gp%d", idx, false,
 350                                 MMC_BLK_DATA_AREA_GP);
 351                 }
 352         }
 353 }
 354
 355 /* Minimum partition switch timeout in milliseconds */
 356 #define MMC_MIN_PART_SWITCH_TIME        300
 357
 358 /*
 359  * Decode extended CSD.
 360  */
 361 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 362 {
 363         int err = 0, idx;
 364         u64 part_size;
 365         struct device_node *np;
 366         bool broken_hpi = false;
 367
 368         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 369         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 370         if (card->csd.structure == 3) {
 371                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 372                         pr_err("%s: unrecognised EXT_CSD structure "
 373                                 "version %d\n", mmc_hostname(card->host),
 374                                         card->ext_csd.raw_ext_csd_structure);
 375                         err = -EINVAL;
 376                         goto out;
 377                 }
 378         }
 379
 380         np = mmc_of_find_child_device(card->host, 0);
 381         if (np && of_device_is_compatible(np, "mmc-card"))
 382                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 383         of_node_put(np);
 384
 385         /*
 386          * The EXT_CSD format is meant to be forward compatible. As long
 387          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 388          * are authorized, see JEDEC JESD84-B50 section B.8.
 389          */
 390         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 391
 392         /* fixup device after ext_csd revision field is updated */
 393         mmc_fixup_device(card, mmc_ext_csd_fixups);
 394
 395         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 396         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 397         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 398         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 399         if (card->ext_csd.rev >= 2) {
 400                 card->ext_csd.sectors =
 401                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 402                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 403                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 404                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 405
 406                 /* Cards with density > 2GiB are sector addressed */
 407                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 408                         mmc_card_set_blockaddr(card);
 409         }
 410
 411         card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
 412         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 413         mmc_select_card_type(card);
 414
 415         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 416         card->ext_csd.raw_erase_timeout_mult =
 417                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 418         card->ext_csd.raw_hc_erase_grp_size =
 419                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 420         if (card->ext_csd.rev >= 3) {
 421                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 422                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 423
 424                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 425                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 426
 427                 /* Sleep / awake timeout in 100ns units */
 428                 if (sa_shift > 0 && sa_shift <= 0x17)
 429                         card->ext_csd.sa_timeout =
 430                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 431                 card->ext_csd.erase_group_def =
 432                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 433                 card->ext_csd.hc_erase_timeout = 300 *
 434                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 435                 card->ext_csd.hc_erase_size =
 436                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 437
 438                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 439
 440                 /*
 441                  * There are two boot regions of equal size, defined in
 442                  * multiples of 128K.
 443                  */
 444                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 445                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 446                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 447                                 mmc_part_add(card, part_size,
 448                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 449                                         "boot%d", idx, true,
 450                                         MMC_BLK_DATA_AREA_BOOT);
 451                         }
 452                 }
 453         }
 454
 455         card->ext_csd.raw_hc_erase_gap_size =
 456                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 457         card->ext_csd.raw_sec_trim_mult =
 458                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 459         card->ext_csd.raw_sec_erase_mult =
 460                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 461         card->ext_csd.raw_sec_feature_support =
 462                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 463         card->ext_csd.raw_trim_mult =
 464                 ext_csd[EXT_CSD_TRIM_MULT];
 465         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 466         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 467         if (card->ext_csd.rev >= 4) {
 468                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 469                     EXT_CSD_PART_SETTING_COMPLETED)
 470                         card->ext_csd.partition_setting_completed = 1;
 471                 else
 472                         card->ext_csd.partition_setting_completed = 0;
 473
 474                 mmc_manage_enhanced_area(card, ext_csd);
 475
 476                 mmc_manage_gp_partitions(card, ext_csd);
 477
 478                 card->ext_csd.sec_trim_mult =
 479                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 480                 card->ext_csd.sec_erase_mult =
 481                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 482                 card->ext_csd.sec_feature_support =
 483                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 484                 card->ext_csd.trim_timeout = 300 *
 485                         ext_csd[EXT_CSD_TRIM_MULT];
 486
 487                 /*
 488                  * Note that the call to mmc_part_add above defaults to read
 489                  * only. If this default assumption is changed, the call must
 490                  * take into account the value of boot_locked below.
 491                  */
 492                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 493                 card->ext_csd.boot_ro_lockable = true;
 494
 495                 /* Save power class values */
 496                 card->ext_csd.raw_pwr_cl_52_195 =
 497                         ext_csd[EXT_CSD_PWR_CL_52_195];
 498                 card->ext_csd.raw_pwr_cl_26_195 =
 499                         ext_csd[EXT_CSD_PWR_CL_26_195];
 500                 card->ext_csd.raw_pwr_cl_52_360 =
 501                         ext_csd[EXT_CSD_PWR_CL_52_360];
 502                 card->ext_csd.raw_pwr_cl_26_360 =
 503                         ext_csd[EXT_CSD_PWR_CL_26_360];
 504                 card->ext_csd.raw_pwr_cl_200_195 =
 505                         ext_csd[EXT_CSD_PWR_CL_200_195];
 506                 card->ext_csd.raw_pwr_cl_200_360 =
 507                         ext_csd[EXT_CSD_PWR_CL_200_360];
 508                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 509                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 510                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 511                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 512                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 513                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 514         }
 515
 516         if (card->ext_csd.rev >= 5) {
 517                 /* Adjust production date as per JEDEC JESD84-B451 */
 518                 if (card->cid.year < 2010)
 519                         card->cid.year += 16;
 520
 521                 /* check whether the eMMC card supports BKOPS */
 522                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 523                         card->ext_csd.bkops = 1;
 524                         card->ext_csd.man_bkops_en =
 525                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 526                                                 EXT_CSD_MANUAL_BKOPS_MASK);
 527                         card->ext_csd.raw_bkops_status =
 528                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 529                         if (card->ext_csd.man_bkops_en)
 530                                 pr_debug("%s: MAN_BKOPS_EN bit is set\n",
 531                                         mmc_hostname(card->host));
 532                         card->ext_csd.auto_bkops_en =
 533                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 534                                                 EXT_CSD_AUTO_BKOPS_MASK);
 535                         if (card->ext_csd.auto_bkops_en)
 536                                 pr_debug("%s: AUTO_BKOPS_EN bit is set\n",
 537                                         mmc_hostname(card->host));
 538                 }
 539
 540                 /* check whether the eMMC card supports HPI */
 541                 if (!mmc_card_broken_hpi(card) &&
 542                     !broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
 543                         card->ext_csd.hpi = 1;
 544                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 545                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 546                         else
 547                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 548                         /*
 549                          * Indicate the maximum timeout to close
 550                          * a command interrupted by HPI
 551                          */
 552                         card->ext_csd.out_of_int_time =
 553                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 554                 }
 555
 556                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 557                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 558
 559                 /*
 560                  * RPMB regions are defined in multiples of 128K.
 561                  */
 562                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 563                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 564                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 565                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 566                                 "rpmb", 0, false,
 567                                 MMC_BLK_DATA_AREA_RPMB);
 568                 }
 569         }
 570
 571         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 572         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 573                 card->erased_byte = 0xFF;
 574         else
 575                 card->erased_byte = 0x0;
 576
 577         /* eMMC v4.5 or later */
 578         card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
 579         if (card->ext_csd.rev >= 6) {
 580                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 581
 582                 card->ext_csd.generic_cmd6_time = 10 *
 583                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 584                 card->ext_csd.power_off_longtime = 10 *
 585                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 586
 587                 card->ext_csd.cache_size =
 588                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 589                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 590                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 591                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 592
 593                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 594                         card->ext_csd.data_sector_size = 4096;
 595                 else
 596                         card->ext_csd.data_sector_size = 512;
 597
 598                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 599                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 600                         card->ext_csd.data_tag_unit_size =
 601                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 602                         (card->ext_csd.data_sector_size);
 603                 } else {
 604                         card->ext_csd.data_tag_unit_size = 0;
 605                 }
 606
 607                 card->ext_csd.max_packed_writes =
 608                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 609                 card->ext_csd.max_packed_reads =
 610                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 611         } else {
 612                 card->ext_csd.data_sector_size = 512;
 613         }
 614
 615         /*
 616          * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined
 617          * when accessing a specific field", so use it here if there is no
 618          * PARTITION_SWITCH_TIME.
 619          */
 620         if (!card->ext_csd.part_time)
 621                 card->ext_csd.part_time = card->ext_csd.generic_cmd6_time;
 622         /* Some eMMC set the value too low so set a minimum */
 623         if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
 624                 card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
 625
 626         /* eMMC v5 or later */
 627         if (card->ext_csd.rev >= 7) {
 628                 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
 629                        MMC_FIRMWARE_LEN);
 630                 card->ext_csd.ffu_capable =
 631                         (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
 632                         !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
 633
 634                 card->ext_csd.pre_eol_info = ext_csd[EXT_CSD_PRE_EOL_INFO];
 635                 card->ext_csd.device_life_time_est_typ_a =
 636                         ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A];
 637                 card->ext_csd.device_life_time_est_typ_b =
 638                         ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B];
 639         }
 640
 641         /* eMMC v5.1 or later */
 642         if (card->ext_csd.rev >= 8) {
 643                 card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
 644                                              EXT_CSD_CMDQ_SUPPORTED;
 645                 card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
 646                                             EXT_CSD_CMDQ_DEPTH_MASK) + 1;
 647                 /* Exclude inefficiently small queue depths */
 648                 if (card->ext_csd.cmdq_depth <= 2) {
 649                         card->ext_csd.cmdq_support = false;
 650                         card->ext_csd.cmdq_depth = 0;
 651                 }
 652                 if (card->ext_csd.cmdq_support) {
 653                         pr_debug("%s: Command Queue supported depth %u\n",
 654                                  mmc_hostname(card->host),
 655                                  card->ext_csd.cmdq_depth);
 656                 }
 657                 card->ext_csd.enhanced_rpmb_supported =
 658                                         (card->ext_csd.rel_param &
 659                                          EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR);
 660         }
 661 out:
 662         return err;
 663 }
 664
 665 static int mmc_read_ext_csd(struct mmc_card *card)
 666 {
 667         u8 *ext_csd;
 668         int err;
 669
 670         if (!mmc_can_ext_csd(card))
 671                 return 0;
 672
 673         err = mmc_get_ext_csd(card, &ext_csd);
 674         if (err) {
 675                 /* If the host or the card can't do the switch,
 676                  * fail more gracefully. */
 677                 if ((err != -EINVAL)
 678                  && (err != -ENOSYS)
 679                  && (err != -EFAULT))
 680                         return err;
 681
 682                 /*
 683                  * High capacity cards should have this "magic" size
 684                  * stored in their CSD.
 685                  */
 686                 if (card->csd.capacity == (4096 * 512)) {
 687                         pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
 688                                 mmc_hostname(card->host));
 689                 } else {
 690                         pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
 691                                 mmc_hostname(card->host));
 692                         err = 0;
 693                 }
 694
 695                 return err;
 696         }
 697
 698         err = mmc_decode_ext_csd(card, ext_csd);
 699         kfree(ext_csd);
 700         return err;
 701 }
 702
 703 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 704 {
 705         u8 *bw_ext_csd;
 706         int err;
 707
 708         if (bus_width == MMC_BUS_WIDTH_1)
 709                 return 0;
 710
 711         err = mmc_get_ext_csd(card, &bw_ext_csd);
 712         if (err)
 713                 return err;
 714
 715         /* only compare read only fields */
 716         err = !((card->ext_csd.raw_partition_support ==
 717                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 718                 (card->ext_csd.raw_erased_mem_count ==
 719                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 720                 (card->ext_csd.rev ==
 721                         bw_ext_csd[EXT_CSD_REV]) &&
 722                 (card->ext_csd.raw_ext_csd_structure ==
 723                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 724                 (card->ext_csd.raw_card_type ==
 725                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 726                 (card->ext_csd.raw_s_a_timeout ==
 727                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 728                 (card->ext_csd.raw_hc_erase_gap_size ==
 729                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 730                 (card->ext_csd.raw_erase_timeout_mult ==
 731                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 732                 (card->ext_csd.raw_hc_erase_grp_size ==
 733                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 734                 (card->ext_csd.raw_sec_trim_mult ==
 735                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 736                 (card->ext_csd.raw_sec_erase_mult ==
 737                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 738                 (card->ext_csd.raw_sec_feature_support ==
 739                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 740                 (card->ext_csd.raw_trim_mult ==
 741                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 742                 (card->ext_csd.raw_sectors[0] ==
 743                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 744                 (card->ext_csd.raw_sectors[1] ==
 745                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 746                 (card->ext_csd.raw_sectors[2] ==
 747                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 748                 (card->ext_csd.raw_sectors[3] ==
 749                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 750                 (card->ext_csd.raw_pwr_cl_52_195 ==
 751                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 752                 (card->ext_csd.raw_pwr_cl_26_195 ==
 753                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 754                 (card->ext_csd.raw_pwr_cl_52_360 ==
 755                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 756                 (card->ext_csd.raw_pwr_cl_26_360 ==
 757                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 758                 (card->ext_csd.raw_pwr_cl_200_195 ==
 759                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 760                 (card->ext_csd.raw_pwr_cl_200_360 ==
 761                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 762                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 763                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 764                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 765                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 766                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 767                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 768
 769         if (err)
 770                 err = -EINVAL;
 771
 772         kfree(bw_ext_csd);
 773         return err;
 774 }
 775
 776 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 777         card->raw_cid[2], card->raw_cid[3]);
 778 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 779         card->raw_csd[2], card->raw_csd[3]);
 780 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 781 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 782 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 783 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 784 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 785 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 786 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 787 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 788 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 789 MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev);
 790 MMC_DEV_ATTR(pre_eol_info, "0x%02x\n", card->ext_csd.pre_eol_info);
 791 MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
 792         card->ext_csd.device_life_time_est_typ_a,
 793         card->ext_csd.device_life_time_est_typ_b);
 794 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 795 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 796                 card->ext_csd.enhanced_area_offset);
 797 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 798 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 799 MMC_DEV_ATTR(enhanced_rpmb_supported, "%#x\n",
 800         card->ext_csd.enhanced_rpmb_supported);
 801 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 802 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
 803 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
 804 MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
 805
 806 static ssize_t mmc_fwrev_show(struct device *dev,
 807                               struct device_attribute *attr,
 808                               char *buf)
 809 {
 810         struct mmc_card *card = mmc_dev_to_card(dev);
 811
 812         if (card->ext_csd.rev < 7) {
 813                 return sprintf(buf, "0x%x\n", card->cid.fwrev);
 814         } else {
 815                 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
 816                                card->ext_csd.fwrev);
 817         }
 818 }
 819
 820 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
 821
 822 static ssize_t mmc_dsr_show(struct device *dev,
 823                             struct device_attribute *attr,
 824                             char *buf)
 825 {
 826         struct mmc_card *card = mmc_dev_to_card(dev);
 827         struct mmc_host *host = card->host;
 828
 829         if (card->csd.dsr_imp && host->dsr_req)
 830                 return sprintf(buf, "0x%x\n", host->dsr);
 831         else
 832                 /* return default DSR value */
 833                 return sprintf(buf, "0x%x\n", 0x404);
 834 }
 835
 836 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
 837
 838 static struct attribute *mmc_std_attrs[] = {
 839         &dev_attr_cid.attr,
 840         &dev_attr_csd.attr,
 841         &dev_attr_date.attr,
 842         &dev_attr_erase_size.attr,
 843         &dev_attr_preferred_erase_size.attr,
 844         &dev_attr_fwrev.attr,
 845         &dev_attr_ffu_capable.attr,
 846         &dev_attr_hwrev.attr,
 847         &dev_attr_manfid.attr,
 848         &dev_attr_name.attr,
 849         &dev_attr_oemid.attr,
 850         &dev_attr_prv.attr,
 851         &dev_attr_rev.attr,
 852         &dev_attr_pre_eol_info.attr,
 853         &dev_attr_life_time.attr,
 854         &dev_attr_serial.attr,
 855         &dev_attr_enhanced_area_offset.attr,
 856         &dev_attr_enhanced_area_size.attr,
 857         &dev_attr_raw_rpmb_size_mult.attr,
 858         &dev_attr_enhanced_rpmb_supported.attr,
 859         &dev_attr_rel_sectors.attr,
 860         &dev_attr_ocr.attr,
 861         &dev_attr_rca.attr,
 862         &dev_attr_dsr.attr,
 863         &dev_attr_cmdq_en.attr,
 864         NULL,
 865 };
 866 ATTRIBUTE_GROUPS(mmc_std);
 867
 868 static struct device_type mmc_type = {
 869         .groups = mmc_std_groups,
 870 };
 871
 872 /*
 873  * Select the PowerClass for the current bus width
 874  * If power class is defined for 4/8 bit bus in the
 875  * extended CSD register, select it by executing the
 876  * mmc_switch command.
 877  */
 878 static int __mmc_select_powerclass(struct mmc_card *card,
 879                                    unsigned int bus_width)
 880 {
 881         struct mmc_host *host = card->host;
 882         struct mmc_ext_csd *ext_csd = &card->ext_csd;
 883         unsigned int pwrclass_val = 0;
 884         int err = 0;
 885
 886         switch (1 << host->ios.vdd) {
 887         case MMC_VDD_165_195:
 888                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 889                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
 890                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 891                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 892                                 ext_csd->raw_pwr_cl_52_195 :
 893                                 ext_csd->raw_pwr_cl_ddr_52_195;
 894                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 895                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
 896                 break;
 897         case MMC_VDD_27_28:
 898         case MMC_VDD_28_29:
 899         case MMC_VDD_29_30:
 900         case MMC_VDD_30_31:
 901         case MMC_VDD_31_32:
 902         case MMC_VDD_32_33:
 903         case MMC_VDD_33_34:
 904         case MMC_VDD_34_35:
 905         case MMC_VDD_35_36:
 906                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 907                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
 908                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 909                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 910                                 ext_csd->raw_pwr_cl_52_360 :
 911                                 ext_csd->raw_pwr_cl_ddr_52_360;
 912                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 913                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
 914                                 ext_csd->raw_pwr_cl_ddr_200_360 :
 915                                 ext_csd->raw_pwr_cl_200_360;
 916                 break;
 917         default:
 918                 pr_warn("%s: Voltage range not supported for power class\n",
 919                         mmc_hostname(host));
 920                 return -EINVAL;
 921         }
 922
 923         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 924                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 925                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 926         else
 927                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 928                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 929
 930         /* If the power class is different from the default value */
 931         if (pwrclass_val > 0) {
 932                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 933                                  EXT_CSD_POWER_CLASS,
 934                                  pwrclass_val,
 935                                  card->ext_csd.generic_cmd6_time);
 936         }
 937
 938         return err;
 939 }
 940
 941 static int mmc_select_powerclass(struct mmc_card *card)
 942 {
 943         struct mmc_host *host = card->host;
 944         u32 bus_width, ext_csd_bits;
 945         int err, ddr;
 946
 947         /* Power class selection is supported for versions >= 4.0 */
 948         if (!mmc_can_ext_csd(card))
 949                 return 0;
 950
 951         bus_width = host->ios.bus_width;
 952         /* Power class values are defined only for 4/8 bit bus */
 953         if (bus_width == MMC_BUS_WIDTH_1)
 954                 return 0;
 955
 956         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 957         if (ddr)
 958                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 959                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 960         else
 961                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 962                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
 963
 964         err = __mmc_select_powerclass(card, ext_csd_bits);
 965         if (err)
 966                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
 967                         mmc_hostname(host), 1 << bus_width, ddr);
 968
 969         return err;
 970 }
 971
 972 /*
 973  * Set the bus speed for the selected speed mode.
 974  */
 975 static void mmc_set_bus_speed(struct mmc_card *card)
 976 {
 977         unsigned int max_dtr = (unsigned int)-1;
 978
 979         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
 980              max_dtr > card->ext_csd.hs200_max_dtr)
 981                 max_dtr = card->ext_csd.hs200_max_dtr;
 982         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
 983                 max_dtr = card->ext_csd.hs_max_dtr;
 984         else if (max_dtr > card->csd.max_dtr)
 985                 max_dtr = card->csd.max_dtr;
 986
 987         mmc_set_clock(card->host, max_dtr);
 988 }
 989
 990 /*
 991  * Select the bus width amoung 4-bit and 8-bit(SDR).
 992  * If the bus width is changed successfully, return the selected width value.
 993  * Zero is returned instead of error value if the wide width is not supported.
 994  */
 995 static int mmc_select_bus_width(struct mmc_card *card)
 996 {
 997         static unsigned ext_csd_bits[] = {
 998                 EXT_CSD_BUS_WIDTH_8,
 999                 EXT_CSD_BUS_WIDTH_4,
1000                 EXT_CSD_BUS_WIDTH_1,
1001         };
1002         static unsigned bus_widths[] = {
1003                 MMC_BUS_WIDTH_8,
1004                 MMC_BUS_WIDTH_4,
1005                 MMC_BUS_WIDTH_1,
1006         };
1007         struct mmc_host *host = card->host;
1008         unsigned idx, bus_width = 0;
1009         int err = 0;
1010
1011         if (!mmc_can_ext_csd(card) ||
1012             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
1013                 return 0;
1014
1015         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
1016
1017         /*
1018          * Unlike SD, MMC cards dont have a configuration register to notify
1019          * supported bus width. So bus test command should be run to identify
1020          * the supported bus width or compare the ext csd values of current
1021          * bus width and ext csd values of 1 bit mode read earlier.
1022          */
1023         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1024                 /*
1025                  * Host is capable of 8bit transfer, then switch
1026                  * the device to work in 8bit transfer mode. If the
1027                  * mmc switch command returns error then switch to
1028                  * 4bit transfer mode. On success set the corresponding
1029                  * bus width on the host.
1030                  */
1031                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1032                                  EXT_CSD_BUS_WIDTH,
1033                                  ext_csd_bits[idx],
1034                                  card->ext_csd.generic_cmd6_time);
1035                 if (err)
1036                         continue;
1037
1038                 bus_width = bus_widths[idx];
1039                 mmc_set_bus_width(host, bus_width);
1040
1041                 /*
1042                  * If controller can't handle bus width test,
1043                  * compare ext_csd previously read in 1 bit mode
1044                  * against ext_csd at new bus width
1045                  */
1046                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1047                         err = mmc_compare_ext_csds(card, bus_width);
1048                 else
1049                         err = mmc_bus_test(card, bus_width);
1050
1051                 if (!err) {
1052                         err = bus_width;
1053                         break;
1054                 } else {
1055                         pr_warn("%s: switch to bus width %d failed\n",
1056                                 mmc_hostname(host), 1 << bus_width);
1057                 }
1058         }
1059
1060         return err;
1061 }
1062
1063 /*
1064  * Switch to the high-speed mode
1065  */
1066 static int mmc_select_hs(struct mmc_card *card)
1067 {
1068         int err;
1069
1070         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1071                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1072                            card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
1073                            true, true);
1074         if (err)
1075                 pr_warn("%s: switch to high-speed failed, err:%d\n",
1076                         mmc_hostname(card->host), err);
1077
1078         return err;
1079 }
1080
1081 /*
1082  * Activate wide bus and DDR if supported.
1083  */
1084 static int mmc_select_hs_ddr(struct mmc_card *card)
1085 {
1086         struct mmc_host *host = card->host;
1087         u32 bus_width, ext_csd_bits;
1088         int err = 0;
1089
1090         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1091                 return 0;
1092
1093         bus_width = host->ios.bus_width;
1094         if (bus_width == MMC_BUS_WIDTH_1)
1095                 return 0;
1096
1097         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1098                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1099
1100         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1101                            EXT_CSD_BUS_WIDTH,
1102                            ext_csd_bits,
1103                            card->ext_csd.generic_cmd6_time,
1104                            MMC_TIMING_MMC_DDR52,
1105                            true, true);
1106         if (err) {
1107                 pr_err("%s: switch to bus width %d ddr failed\n",
1108                         mmc_hostname(host), 1 << bus_width);
1109                 return err;
1110         }
1111
1112         /*
1113          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1114          * signaling.
1115          *
1116          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1117          *
1118          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1119          * in the JEDEC spec for DDR.
1120          *
1121          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1122          * host controller can support this, like some of the SDHCI
1123          * controller which connect to an eMMC device. Some of these
1124          * host controller still needs to use 1.8v vccq for supporting
1125          * DDR mode.
1126          *
1127          * So the sequence will be:
1128          * if (host and device can both support 1.2v IO)
1129          *      use 1.2v IO;
1130          * else if (host and device can both support 1.8v IO)
1131          *      use 1.8v IO;
1132          * so if host and device can only support 3.3v IO, this is the
1133          * last choice.
1134          *
1135          * WARNING: eMMC rules are NOT the same as SD DDR
1136          */
1137         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
1138                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1139                 if (!err)
1140                         return 0;
1141         }
1142
1143         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V &&
1144             host->caps & MMC_CAP_1_8V_DDR)
1145                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1146
1147         /* make sure vccq is 3.3v after switching disaster */
1148         if (err)
1149                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1150
1151         return err;
1152 }
1153
1154 static int mmc_select_hs400(struct mmc_card *card)
1155 {
1156         struct mmc_host *host = card->host;
1157         unsigned int max_dtr;
1158         int err = 0;
1159         u8 val;
1160
1161         /*
1162          * HS400 mode requires 8-bit bus width
1163          */
1164         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1165               host->ios.bus_width == MMC_BUS_WIDTH_8))
1166                 return 0;
1167
1168         /* Switch card to HS mode */
1169         val = EXT_CSD_TIMING_HS;
1170         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1171                            EXT_CSD_HS_TIMING, val,
1172                            card->ext_csd.generic_cmd6_time, 0,
1173                            false, true);
1174         if (err) {
1175                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1176                         mmc_hostname(host), err);
1177                 return err;
1178         }
1179
1180         /* Prepare host to downgrade to HS timing */
1181         if (host->ops->hs400_downgrade)
1182                 host->ops->hs400_downgrade(host);
1183
1184         /* Set host controller to HS timing */
1185         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1186
1187         /* Reduce frequency to HS frequency */
1188         max_dtr = card->ext_csd.hs_max_dtr;
1189         mmc_set_clock(host, max_dtr);
1190
1191         err = mmc_switch_status(card, true);
1192         if (err)
1193                 goto out_err;
1194
1195         if (host->ops->hs400_prepare_ddr)
1196                 host->ops->hs400_prepare_ddr(host);
1197
1198         /* Switch card to DDR */
1199         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1200                          EXT_CSD_BUS_WIDTH,
1201                          EXT_CSD_DDR_BUS_WIDTH_8,
1202                          card->ext_csd.generic_cmd6_time);
1203         if (err) {
1204                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1205                         mmc_hostname(host), err);
1206                 return err;
1207         }
1208
1209         /* Switch card to HS400 */
1210         val = EXT_CSD_TIMING_HS400 |
1211               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1212         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1213                            EXT_CSD_HS_TIMING, val,
1214                            card->ext_csd.generic_cmd6_time, 0,
1215                            false, true);
1216         if (err) {
1217                 pr_err("%s: switch to hs400 failed, err:%d\n",
1218                          mmc_hostname(host), err);
1219                 return err;
1220         }
1221
1222         /* Set host controller to HS400 timing and frequency */
1223         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1224         mmc_set_bus_speed(card);
1225
1226         if (host->ops->hs400_complete)
1227                 host->ops->hs400_complete(host);
1228
1229         err = mmc_switch_status(card, true);
1230         if (err)
1231                 goto out_err;
1232
1233         return 0;
1234
1235 out_err:
1236         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1237                __func__, err);
1238         return err;
1239 }
1240
1241 int mmc_hs200_to_hs400(struct mmc_card *card)
1242 {
1243         return mmc_select_hs400(card);
1244 }
1245
1246 int mmc_hs400_to_hs200(struct mmc_card *card)
1247 {
1248         struct mmc_host *host = card->host;
1249         unsigned int max_dtr;
1250         int err;
1251         u8 val;
1252
1253         /* Reduce frequency to HS */
1254         max_dtr = card->ext_csd.hs_max_dtr;
1255         mmc_set_clock(host, max_dtr);
1256
1257         /* Switch HS400 to HS DDR */
1258         val = EXT_CSD_TIMING_HS;
1259         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1260                            val, card->ext_csd.generic_cmd6_time, 0,
1261                            false, true);
1262         if (err)
1263                 goto out_err;
1264
1265         if (host->ops->hs400_downgrade)
1266                 host->ops->hs400_downgrade(host);
1267
1268         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1269
1270         err = mmc_switch_status(card, true);
1271         if (err)
1272                 goto out_err;
1273
1274         /* Switch HS DDR to HS */
1275         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1276                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1277                            0, false, true);
1278         if (err)
1279                 goto out_err;
1280
1281         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1282
1283         err = mmc_switch_status(card, true);
1284         if (err)
1285                 goto out_err;
1286
1287         /* Switch HS to HS200 */
1288         val = EXT_CSD_TIMING_HS200 |
1289               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1290         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1291                            val, card->ext_csd.generic_cmd6_time, 0,
1292                            false, true);
1293         if (err)
1294                 goto out_err;
1295
1296         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1297
1298         /*
1299          * For HS200, CRC errors are not a reliable way to know the switch
1300          * failed. If there really is a problem, we would expect tuning will
1301          * fail and the result ends up the same.
1302          */
1303         err = mmc_switch_status(card, false);
1304         if (err)
1305                 goto out_err;
1306
1307         mmc_set_bus_speed(card);
1308
1309         /* Prepare tuning for HS400 mode. */
1310         if (host->ops->prepare_hs400_tuning)
1311                 host->ops->prepare_hs400_tuning(host, &host->ios);
1312
1313         return 0;
1314
1315 out_err:
1316         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1317                __func__, err);
1318         return err;
1319 }
1320
1321 static void mmc_select_driver_type(struct mmc_card *card)
1322 {
1323         int card_drv_type, drive_strength, drv_type = 0;
1324         int fixed_drv_type = card->host->fixed_drv_type;
1325
1326         card_drv_type = card->ext_csd.raw_driver_strength |
1327                         mmc_driver_type_mask(0);
1328
1329         if (fixed_drv_type >= 0)
1330                 drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
1331                                  ? fixed_drv_type : 0;
1332         else
1333                 drive_strength = mmc_select_drive_strength(card,
1334                                                            card->ext_csd.hs200_max_dtr,
1335                                                            card_drv_type, &drv_type);
1336
1337         card->drive_strength = drive_strength;
1338
1339         if (drv_type)
1340                 mmc_set_driver_type(card->host, drv_type);
1341 }
1342
1343 static int mmc_select_hs400es(struct mmc_card *card)
1344 {
1345         struct mmc_host *host = card->host;
1346         int err = -EINVAL;
1347         u8 val;
1348
1349         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1350                 err = -ENOTSUPP;
1351                 goto out_err;
1352         }
1353
1354         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1355                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1356
1357         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1358                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1359
1360         /* If fails try again during next card power cycle */
1361         if (err)
1362                 goto out_err;
1363
1364         err = mmc_select_bus_width(card);
1365         if (err != MMC_BUS_WIDTH_8) {
1366                 pr_err("%s: switch to 8bit bus width failed, err:%d\n",
1367                         mmc_hostname(host), err);
1368                 err = err < 0 ? err : -ENOTSUPP;
1369                 goto out_err;
1370         }
1371
1372         /* Switch card to HS mode */
1373         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1374                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1375                            card->ext_csd.generic_cmd6_time, 0,
1376                            false, true);
1377         if (err) {
1378                 pr_err("%s: switch to hs for hs400es failed, err:%d\n",
1379                         mmc_hostname(host), err);
1380                 goto out_err;
1381         }
1382
1383         /*
1384          * Bump to HS timing and frequency. Some cards don't handle
1385          * SEND_STATUS reliably at the initial frequency.
1386          */
1387         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1388         mmc_set_bus_speed(card);
1389
1390         err = mmc_switch_status(card, true);
1391         if (err)
1392                 goto out_err;
1393
1394         /* Switch card to DDR with strobe bit */
1395         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1396         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1397                          EXT_CSD_BUS_WIDTH,
1398                          val,
1399                          card->ext_csd.generic_cmd6_time);
1400         if (err) {
1401                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1402                         mmc_hostname(host), err);
1403                 goto out_err;
1404         }
1405
1406         mmc_select_driver_type(card);
1407
1408         /* Switch card to HS400 */
1409         val = EXT_CSD_TIMING_HS400 |
1410               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1411         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1412                            EXT_CSD_HS_TIMING, val,
1413                            card->ext_csd.generic_cmd6_time, 0,
1414                            false, true);
1415         if (err) {
1416                 pr_err("%s: switch to hs400es failed, err:%d\n",
1417                         mmc_hostname(host), err);
1418                 goto out_err;
1419         }
1420
1421         /* Set host controller to HS400 timing and frequency */
1422         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1423
1424         /* Controller enable enhanced strobe function */
1425         host->ios.enhanced_strobe = true;
1426         if (host->ops->hs400_enhanced_strobe)
1427                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1428
1429         err = mmc_switch_status(card, true);
1430         if (err)
1431                 goto out_err;
1432
1433         return 0;
1434
1435 out_err:
1436         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1437                __func__, err);
1438         return err;
1439 }
1440
1441 /*
1442  * For device supporting HS200 mode, the following sequence
1443  * should be done before executing the tuning process.
1444  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1445  * 2. switch to HS200 mode
1446  * 3. set the clock to > 52Mhz and <=200MHz
1447  */
1448 static int mmc_select_hs200(struct mmc_card *card)
1449 {
1450         struct mmc_host *host = card->host;
1451         unsigned int old_timing, old_signal_voltage, old_clock;
1452         int err = -EINVAL;
1453         u8 val;
1454
1455         old_signal_voltage = host->ios.signal_voltage;
1456         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1457                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1458
1459         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1460                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1461
1462         /* If fails try again during next card power cycle */
1463         if (err)
1464                 return err;
1465
1466         mmc_select_driver_type(card);
1467
1468         /*
1469          * Set the bus width(4 or 8) with host's support and
1470          * switch to HS200 mode if bus width is set successfully.
1471          */
1472         err = mmc_select_bus_width(card);
1473         if (err > 0) {
1474                 val = EXT_CSD_TIMING_HS200 |
1475                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1476                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1477                                    EXT_CSD_HS_TIMING, val,
1478                                    card->ext_csd.generic_cmd6_time, 0,
1479                                    false, true);
1480                 if (err)
1481                         goto err;
1482
1483                 /*
1484                  * Bump to HS timing and frequency. Some cards don't handle
1485                  * SEND_STATUS reliably at the initial frequency.
1486                  * NB: We can't move to full (HS200) speeds until after we've
1487                  * successfully switched over.
1488                  */
1489                 old_timing = host->ios.timing;
1490                 old_clock = host->ios.clock;
1491                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1492                 mmc_set_clock(card->host, card->ext_csd.hs_max_dtr);
1493
1494                 /*
1495                  * For HS200, CRC errors are not a reliable way to know the
1496                  * switch failed. If there really is a problem, we would expect
1497                  * tuning will fail and the result ends up the same.
1498                  */
1499                 err = mmc_switch_status(card, false);
1500
1501                 /*
1502                  * mmc_select_timing() assumes timing has not changed if
1503                  * it is a switch error.
1504                  */
1505                 if (err == -EBADMSG) {
1506                         mmc_set_clock(host, old_clock);
1507                         mmc_set_timing(host, old_timing);
1508                 }
1509         }
1510 err:
1511         if (err) {
1512                 /* fall back to the old signal voltage, if fails report error */
1513                 if (mmc_set_signal_voltage(host, old_signal_voltage))
1514                         err = -EIO;
1515
1516                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1517                        __func__, err);
1518         }
1519         return err;
1520 }
1521
1522 /*
1523  * Activate High Speed, HS200 or HS400ES mode if supported.
1524  */
1525 static int mmc_select_timing(struct mmc_card *card)
1526 {
1527         int err = 0;
1528
1529         if (!mmc_can_ext_csd(card))
1530                 goto bus_speed;
1531
1532         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1533                 err = mmc_select_hs400es(card);
1534         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1535                 err = mmc_select_hs200(card);
1536         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1537                 err = mmc_select_hs(card);
1538
1539         if (err && err != -EBADMSG)
1540                 return err;
1541
1542 bus_speed:
1543         /*
1544          * Set the bus speed to the selected bus timing.
1545          * If timing is not selected, backward compatible is the default.
1546          */
1547         mmc_set_bus_speed(card);
1548         return 0;
1549 }
1550
1551 /*
1552  * Execute tuning sequence to seek the proper bus operating
1553  * conditions for HS200 and HS400, which sends CMD21 to the device.
1554  */
1555 static int mmc_hs200_tuning(struct mmc_card *card)
1556 {
1557         struct mmc_host *host = card->host;
1558
1559         /*
1560          * Timing should be adjusted to the HS400 target
1561          * operation frequency for tuning process
1562          */
1563         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1564             host->ios.bus_width == MMC_BUS_WIDTH_8)
1565                 if (host->ops->prepare_hs400_tuning)
1566                         host->ops->prepare_hs400_tuning(host, &host->ios);
1567
1568         return mmc_execute_tuning(card);
1569 }
1570
1571 /*
1572  * Handle the detection and initialisation of a card.
1573  *
1574  * In the case of a resume, "oldcard" will contain the card
1575  * we're trying to reinitialise.
1576  */
1577 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1578         struct mmc_card *oldcard)
1579 {
1580         struct mmc_card *card;
1581         int err;
1582         u32 cid[4];
1583         u32 rocr;
1584
1585         WARN_ON(!host->claimed);
1586
1587         /* Set correct bus mode for MMC before attempting init */
1588         if (!mmc_host_is_spi(host))
1589                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1590
1591         /*
1592          * Since we're changing the OCR value, we seem to
1593          * need to tell some cards to go back to the idle
1594          * state.  We wait 1ms to give cards time to
1595          * respond.
1596          * mmc_go_idle is needed for eMMC that are asleep
1597          */
1598         mmc_go_idle(host);
1599
1600         /* The extra bit indicates that we support high capacity */
1601         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1602         if (err)
1603                 goto err;
1604
1605         /*
1606          * For SPI, enable CRC as appropriate.
1607          */
1608         if (mmc_host_is_spi(host)) {
1609                 err = mmc_spi_set_crc(host, use_spi_crc);
1610                 if (err)
1611                         goto err;
1612         }
1613
1614         /*
1615          * Fetch CID from card.
1616          */
1617         err = mmc_send_cid(host, cid);
1618         if (err)
1619                 goto err;
1620
1621         if (oldcard) {
1622                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1623                         pr_debug("%s: Perhaps the card was replaced\n",
1624                                 mmc_hostname(host));
1625                         err = -ENOENT;
1626                         goto err;
1627                 }
1628
1629                 card = oldcard;
1630         } else {
1631                 /*
1632                  * Allocate card structure.
1633                  */
1634                 card = mmc_alloc_card(host, &mmc_type);
1635                 if (IS_ERR(card)) {
1636                         err = PTR_ERR(card);
1637                         goto err;
1638                 }
1639
1640                 card->ocr = ocr;
1641                 card->type = MMC_TYPE_MMC;
1642                 card->rca = 1;
1643                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1644         }
1645
1646         /*
1647          * Call the optional HC's init_card function to handle quirks.
1648          */
1649         if (host->ops->init_card)
1650                 host->ops->init_card(host, card);
1651
1652         /*
1653          * For native busses:  set card RCA and quit open drain mode.
1654          */
1655         if (!mmc_host_is_spi(host)) {
1656                 err = mmc_set_relative_addr(card);
1657                 if (err)
1658                         goto free_card;
1659
1660                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1661         }
1662
1663         if (!oldcard) {
1664                 /*
1665                  * Fetch CSD from card.
1666                  */
1667                 err = mmc_send_csd(card, card->raw_csd);
1668                 if (err)
1669                         goto free_card;
1670
1671                 err = mmc_decode_csd(card);
1672                 if (err)
1673                         goto free_card;
1674                 err = mmc_decode_cid(card);
1675                 if (err)
1676                         goto free_card;
1677         }
1678
1679         /*
1680          * handling only for cards supporting DSR and hosts requesting
1681          * DSR configuration
1682          */
1683         if (card->csd.dsr_imp && host->dsr_req)
1684                 mmc_set_dsr(host);
1685
1686         /*
1687          * Select card, as all following commands rely on that.
1688          */
1689         if (!mmc_host_is_spi(host)) {
1690                 err = mmc_select_card(card);
1691                 if (err)
1692                         goto free_card;
1693         }
1694
1695         if (!oldcard) {
1696                 /* Read extended CSD. */
1697                 err = mmc_read_ext_csd(card);
1698                 if (err)
1699                         goto free_card;
1700
1701                 /*
1702                  * If doing byte addressing, check if required to do sector
1703                  * addressing.  Handle the case of <2GB cards needing sector
1704                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1705                  * ocr register has bit 30 set for sector addressing.
1706                  */
1707                 if (rocr & BIT(30))
1708                         mmc_card_set_blockaddr(card);
1709
1710                 /* Erase size depends on CSD and Extended CSD */
1711                 mmc_set_erase_size(card);
1712         }
1713
1714         /* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */
1715         if (card->ext_csd.rev >= 3) {
1716                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1717                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1718                                  card->ext_csd.generic_cmd6_time);
1719
1720                 if (err && err != -EBADMSG)
1721                         goto free_card;
1722
1723                 if (err) {
1724                         err = 0;
1725                         /*
1726                          * Just disable enhanced area off & sz
1727                          * will try to enable ERASE_GROUP_DEF
1728                          * during next time reinit
1729                          */
1730                         card->ext_csd.enhanced_area_offset = -EINVAL;
1731                         card->ext_csd.enhanced_area_size = -EINVAL;
1732                 } else {
1733                         card->ext_csd.erase_group_def = 1;
1734                         /*
1735                          * enable ERASE_GRP_DEF successfully.
1736                          * This will affect the erase size, so
1737                          * here need to reset erase size
1738                          */
1739                         mmc_set_erase_size(card);
1740                 }
1741         }
1742
1743         /*
1744          * Ensure eMMC user default partition is enabled
1745          */
1746         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1747                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1748                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1749                                  card->ext_csd.part_config,
1750                                  card->ext_csd.part_time);
1751                 if (err && err != -EBADMSG)
1752                         goto free_card;
1753         }
1754
1755         /*
1756          * Enable power_off_notification byte in the ext_csd register
1757          */
1758         if (card->ext_csd.rev >= 6) {
1759                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1760                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1761                                  EXT_CSD_POWER_ON,
1762                                  card->ext_csd.generic_cmd6_time);
1763                 if (err && err != -EBADMSG)
1764                         goto free_card;
1765
1766                 /*
1767                  * The err can be -EBADMSG or 0,
1768                  * so check for success and update the flag
1769                  */
1770                 if (!err)
1771                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1772         }
1773
1774         /* set erase_arg */
1775         if (mmc_can_discard(card))
1776                 card->erase_arg = MMC_DISCARD_ARG;
1777         else if (mmc_can_trim(card))
1778                 card->erase_arg = MMC_TRIM_ARG;
1779         else
1780                 card->erase_arg = MMC_ERASE_ARG;
1781
1782         /*
1783          * Select timing interface
1784          */
1785         err = mmc_select_timing(card);
1786         if (err)
1787                 goto free_card;
1788
1789         if (mmc_card_hs200(card)) {
1790                 host->doing_init_tune = 1;
1791
1792                 err = mmc_hs200_tuning(card);
1793                 if (!err)
1794                         err = mmc_select_hs400(card);
1795
1796                 host->doing_init_tune = 0;
1797
1798                 if (err)
1799                         goto free_card;
1800
1801         } else if (!mmc_card_hs400es(card)) {
1802                 /* Select the desired bus width optionally */
1803                 err = mmc_select_bus_width(card);
1804                 if (err > 0 && mmc_card_hs(card)) {
1805                         err = mmc_select_hs_ddr(card);
1806                         if (err)
1807                                 goto free_card;
1808                 }
1809         }
1810
1811         /*
1812          * Choose the power class with selected bus interface
1813          */
1814         mmc_select_powerclass(card);
1815
1816         /*
1817          * Enable HPI feature (if supported)
1818          */
1819         if (card->ext_csd.hpi) {
1820                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1821                                 EXT_CSD_HPI_MGMT, 1,
1822                                 card->ext_csd.generic_cmd6_time);
1823                 if (err && err != -EBADMSG)
1824                         goto free_card;
1825                 if (err) {
1826                         pr_warn("%s: Enabling HPI failed\n",
1827                                 mmc_hostname(card->host));
1828                         card->ext_csd.hpi_en = 0;
1829                         err = 0;
1830                 } else {
1831                         card->ext_csd.hpi_en = 1;
1832                 }
1833         }
1834
1835         /*
1836          * If cache size is higher than 0, this indicates the existence of cache
1837          * and it can be turned on. Note that some eMMCs from Micron has been
1838          * reported to need ~800 ms timeout, while enabling the cache after
1839          * sudden power failure tests. Let's extend the timeout to a minimum of
1840          * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
1841          */
1842         if (card->ext_csd.cache_size > 0) {
1843                 unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
1844
1845                 timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
1846                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1847                                 EXT_CSD_CACHE_CTRL, 1, timeout_ms);
1848                 if (err && err != -EBADMSG)
1849                         goto free_card;
1850
1851                 /*
1852                  * Only if no error, cache is turned on successfully.
1853                  */
1854                 if (err) {
1855                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1856                                 mmc_hostname(card->host), err);
1857                         card->ext_csd.cache_ctrl = 0;
1858                         err = 0;
1859                 } else {
1860                         card->ext_csd.cache_ctrl = 1;
1861                 }
1862         }
1863
1864         /*
1865          * Enable Command Queue if supported. Note that Packed Commands cannot
1866          * be used with Command Queue.
1867          */
1868         card->ext_csd.cmdq_en = false;
1869         if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) {
1870                 err = mmc_cmdq_enable(card);
1871                 if (err && err != -EBADMSG)
1872                         goto free_card;
1873                 if (err) {
1874                         pr_warn("%s: Enabling CMDQ failed\n",
1875                                 mmc_hostname(card->host));
1876                         card->ext_csd.cmdq_support = false;
1877                         card->ext_csd.cmdq_depth = 0;
1878                         err = 0;
1879                 }
1880         }
1881         /*
1882          * In some cases (e.g. RPMB or mmc_test), the Command Queue must be
1883          * disabled for a time, so a flag is needed to indicate to re-enable the
1884          * Command Queue.
1885          */
1886         card->reenable_cmdq = card->ext_csd.cmdq_en;
1887
1888         if (host->cqe_ops && !host->cqe_enabled) {
1889                 err = host->cqe_ops->cqe_enable(host, card);
1890                 if (!err) {
1891                         host->cqe_enabled = true;
1892
1893                         if (card->ext_csd.cmdq_en) {
1894                                 pr_info("%s: Command Queue Engine enabled\n",
1895                                         mmc_hostname(host));
1896                         } else {
1897                                 host->hsq_enabled = true;
1898                                 pr_info("%s: Host Software Queue enabled\n",
1899                                         mmc_hostname(host));
1900                         }
1901                 }
1902         }
1903
1904         if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1905             host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1906                 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1907                         mmc_hostname(host));
1908                 err = -EINVAL;
1909                 goto free_card;
1910         }
1911
1912         if (!oldcard)
1913                 host->card = card;
1914
1915         return 0;
1916
1917 free_card:
1918         if (!oldcard)
1919                 mmc_remove_card(card);
1920 err:
1921         return err;
1922 }
1923
1924 static int mmc_can_sleep(struct mmc_card *card)
1925 {
1926         return (card && card->ext_csd.rev >= 3);
1927 }
1928
1929 static int mmc_sleep(struct mmc_host *host)
1930 {
1931         struct mmc_command cmd = {};
1932         struct mmc_card *card = host->card;
1933         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1934         int err;
1935
1936         /* Re-tuning can't be done once the card is deselected */
1937         mmc_retune_hold(host);
1938
1939         err = mmc_deselect_cards(host);
1940         if (err)
1941                 goto out_release;
1942
1943         cmd.opcode = MMC_SLEEP_AWAKE;
1944         cmd.arg = card->rca << 16;
1945         cmd.arg |= 1 << 15;
1946
1947         /*
1948          * If the max_busy_timeout of the host is specified, validate it against
1949          * the sleep cmd timeout. A failure means we need to prevent the host
1950          * from doing hw busy detection, which is done by converting to a R1
1951          * response instead of a R1B. Note, some hosts requires R1B, which also
1952          * means they are on their own when it comes to deal with the busy
1953          * timeout.
1954          */
1955         if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) && host->max_busy_timeout &&
1956             (timeout_ms > host->max_busy_timeout)) {
1957                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1958         } else {
1959                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1960                 cmd.busy_timeout = timeout_ms;
1961         }
1962
1963         err = mmc_wait_for_cmd(host, &cmd, 0);
1964         if (err)
1965                 goto out_release;
1966
1967         /*
1968          * If the host does not wait while the card signals busy, then we will
1969          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1970          * SEND_STATUS command to poll the status because that command (and most
1971          * others) is invalid while the card sleeps.
1972          */
1973         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1974                 mmc_delay(timeout_ms);
1975
1976 out_release:
1977         mmc_retune_release(host);
1978         return err;
1979 }
1980
1981 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1982 {
1983         return card &&
1984                 mmc_card_mmc(card) &&
1985                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1986 }
1987
1988 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1989 {
1990         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1991         int err;
1992
1993         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1994         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1995                 timeout = card->ext_csd.power_off_longtime;
1996
1997         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1998                         EXT_CSD_POWER_OFF_NOTIFICATION,
1999                         notify_type, timeout, 0, false, false);
2000         if (err)
2001                 pr_err("%s: Power Off Notification timed out, %u\n",
2002                        mmc_hostname(card->host), timeout);
2003
2004         /* Disable the power off notification after the switch operation. */
2005         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
2006
2007         return err;
2008 }
2009
2010 /*
2011  * Host is being removed. Free up the current card.
2012  */
2013 static void mmc_remove(struct mmc_host *host)
2014 {
2015         mmc_remove_card(host->card);
2016         host->card = NULL;
2017 }
2018
2019 /*
2020  * Card detection - card is alive.
2021  */
2022 static int mmc_alive(struct mmc_host *host)
2023 {
2024         return mmc_send_status(host->card, NULL);
2025 }
2026
2027 /*
2028  * Card detection callback from host.
2029  */
2030 static void mmc_detect(struct mmc_host *host)
2031 {
2032         int err;
2033
2034         mmc_get_card(host->card, NULL);
2035
2036         /*
2037          * Just check if our card has been removed.
2038          */
2039         err = _mmc_detect_card_removed(host);
2040
2041         mmc_put_card(host->card, NULL);
2042
2043         if (err) {
2044                 mmc_remove(host);
2045
2046                 mmc_claim_host(host);
2047                 mmc_detach_bus(host);
2048                 mmc_power_off(host);
2049                 mmc_release_host(host);
2050         }
2051 }
2052
2053 static bool _mmc_cache_enabled(struct mmc_host *host)
2054 {
2055         return host->card->ext_csd.cache_size > 0 &&
2056                host->card->ext_csd.cache_ctrl & 1;
2057 }
2058
2059 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
2060 {
2061         int err = 0;
2062         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
2063                                         EXT_CSD_POWER_OFF_LONG;
2064
2065         mmc_claim_host(host);
2066
2067         if (mmc_card_suspended(host->card))
2068                 goto out;
2069
2070         err = mmc_flush_cache(host->card);
2071         if (err)
2072                 goto out;
2073
2074         if (mmc_can_poweroff_notify(host->card) &&
2075             ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend ||
2076              (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND)))
2077                 err = mmc_poweroff_notify(host->card, notify_type);
2078         else if (mmc_can_sleep(host->card))
2079                 err = mmc_sleep(host);
2080         else if (!mmc_host_is_spi(host))
2081                 err = mmc_deselect_cards(host);
2082
2083         if (!err) {
2084                 mmc_power_off(host);
2085                 mmc_card_set_suspended(host->card);
2086         }
2087 out:
2088         mmc_release_host(host);
2089         return err;
2090 }
2091
2092 /*
2093  * Suspend callback
2094  */
2095 static int mmc_suspend(struct mmc_host *host)
2096 {
2097         int err;
2098
2099         err = _mmc_suspend(host, true);
2100         if (!err) {
2101                 pm_runtime_disable(&host->card->dev);
2102                 pm_runtime_set_suspended(&host->card->dev);
2103         }
2104
2105         return err;
2106 }
2107
2108 /*
2109  * This function tries to determine if the same card is still present
2110  * and, if so, restore all state to it.
2111  */
2112 static int _mmc_resume(struct mmc_host *host)
2113 {
2114         int err = 0;
2115
2116         mmc_claim_host(host);
2117
2118         if (!mmc_card_suspended(host->card))
2119                 goto out;
2120
2121         mmc_power_up(host, host->card->ocr);
2122         err = mmc_init_card(host, host->card->ocr, host->card);
2123         mmc_card_clr_suspended(host->card);
2124
2125 out:
2126         mmc_release_host(host);
2127         return err;
2128 }
2129
2130 /*
2131  * Shutdown callback
2132  */
2133 static int mmc_shutdown(struct mmc_host *host)
2134 {
2135         int err = 0;
2136
2137         /*
2138          * In a specific case for poweroff notify, we need to resume the card
2139          * before we can shutdown it properly.
2140          */
2141         if (mmc_can_poweroff_notify(host->card) &&
2142                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2143                 err = _mmc_resume(host);
2144
2145         if (!err)
2146                 err = _mmc_suspend(host, false);
2147
2148         return err;
2149 }
2150
2151 /*
2152  * Callback for resume.
2153  */
2154 static int mmc_resume(struct mmc_host *host)
2155 {
2156         pm_runtime_enable(&host->card->dev);
2157         return 0;
2158 }
2159
2160 /*
2161  * Callback for runtime_suspend.
2162  */
2163 static int mmc_runtime_suspend(struct mmc_host *host)
2164 {
2165         int err;
2166
2167         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2168                 return 0;
2169
2170         err = _mmc_suspend(host, true);
2171         if (err)
2172                 pr_err("%s: error %d doing aggressive suspend\n",
2173                         mmc_hostname(host), err);
2174
2175         return err;
2176 }
2177
2178 /*
2179  * Callback for runtime_resume.
2180  */
2181 static int mmc_runtime_resume(struct mmc_host *host)
2182 {
2183         int err;
2184
2185         err = _mmc_resume(host);
2186         if (err && err != -ENOMEDIUM)
2187                 pr_err("%s: error %d doing runtime resume\n",
2188                         mmc_hostname(host), err);
2189
2190         return 0;
2191 }
2192
2193 static int mmc_can_reset(struct mmc_card *card)
2194 {
2195         u8 rst_n_function;
2196
2197         rst_n_function = card->ext_csd.rst_n_function;
2198         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2199                 return 0;
2200         return 1;
2201 }
2202
2203 static int _mmc_hw_reset(struct mmc_host *host)
2204 {
2205         struct mmc_card *card = host->card;
2206
2207         /*
2208          * In the case of recovery, we can't expect flushing the cache to work
2209          * always, but we have a go and ignore errors.
2210          */
2211         mmc_flush_cache(host->card);
2212
2213         if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
2214              mmc_can_reset(card)) {
2215                 /* If the card accept RST_n signal, send it. */
2216                 mmc_set_clock(host, host->f_init);
2217                 host->ops->hw_reset(host);
2218                 /* Set initial state and call mmc_set_ios */
2219                 mmc_set_initial_state(host);
2220         } else {
2221                 /* Do a brute force power cycle */
2222                 mmc_power_cycle(host, card->ocr);
2223                 mmc_pwrseq_reset(host);
2224         }
2225         return mmc_init_card(host, card->ocr, card);
2226 }
2227
2228 static const struct mmc_bus_ops mmc_ops = {
2229         .remove = mmc_remove,
2230         .detect = mmc_detect,
2231         .suspend = mmc_suspend,
2232         .resume = mmc_resume,
2233         .runtime_suspend = mmc_runtime_suspend,
2234         .runtime_resume = mmc_runtime_resume,
2235         .alive = mmc_alive,
2236         .shutdown = mmc_shutdown,
2237         .hw_reset = _mmc_hw_reset,
2238         .cache_enabled = _mmc_cache_enabled,
2239 };
2240
2241 /*
2242  * Starting point for MMC card init.
2243  */
2244 int mmc_attach_mmc(struct mmc_host *host)
2245 {
2246         int err;
2247         u32 ocr, rocr;
2248
2249         WARN_ON(!host->claimed);
2250
2251         /* Set correct bus mode for MMC before attempting attach */
2252         if (!mmc_host_is_spi(host))
2253                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2254
2255         err = mmc_send_op_cond(host, 0, &ocr);
2256         if (err)
2257                 return err;
2258
2259         mmc_attach_bus(host, &mmc_ops);
2260         if (host->ocr_avail_mmc)
2261                 host->ocr_avail = host->ocr_avail_mmc;
2262
2263         /*
2264          * We need to get OCR a different way for SPI.
2265          */
2266         if (mmc_host_is_spi(host)) {
2267                 err = mmc_spi_read_ocr(host, 1, &ocr);
2268                 if (err)
2269                         goto err;
2270         }
2271
2272         rocr = mmc_select_voltage(host, ocr);
2273
2274         /*
2275          * Can we support the voltage of the card?
2276          */
2277         if (!rocr) {
2278                 err = -EINVAL;
2279                 goto err;
2280         }
2281
2282         /*
2283          * Detect and init the card.
2284          */
2285         err = mmc_init_card(host, rocr, NULL);
2286         if (err)
2287                 goto err;
2288
2289         mmc_release_host(host);
2290         err = mmc_add_card(host->card);
2291         if (err)
2292                 goto remove_card;
2293
2294         mmc_claim_host(host);
2295         return 0;
2296
2297 remove_card:
2298         mmc_remove_card(host->card);
2299         mmc_claim_host(host);
2300         host->card = NULL;
2301 err:
2302         mmc_detach_bus(host);
2303
2304         pr_err("%s: error %d whilst initialising MMC card\n",
2305                 mmc_hostname(host), err);
2306
2307         return err;
2308 }