drivers/mmc/core/mmc.c

   1 /*
   2  *  linux/drivers/mmc/core/mmc.c
   3  *
   4  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   5  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   6  *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/of.h>
  15 #include <linux/slab.h>
  16 #include <linux/stat.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <linux/mmc/host.h>
  20 #include <linux/mmc/card.h>
  21 #include <linux/mmc/mmc.h>
  22
  23 #include "core.h"
  24 #include "host.h"
  25 #include "bus.h"
  26 #include "mmc_ops.h"
  27 #include "sd_ops.h"
  28
  29 #define DEFAULT_CMD6_TIMEOUT_MS 500
  30
  31 static const unsigned int tran_exp[] = {
  32         10000,          100000,         1000000,        10000000,
  33         0,              0,              0,              0
  34 };
  35
  36 static const unsigned char tran_mant[] = {
  37         0,      10,     12,     13,     15,     20,     25,     30,
  38         35,     40,     45,     50,     55,     60,     70,     80,
  39 };
  40
  41 static const unsigned int tacc_exp[] = {
  42         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  43 };
  44
  45 static const unsigned int tacc_mant[] = {
  46         0,      10,     12,     13,     15,     20,     25,     30,
  47         35,     40,     45,     50,     55,     60,     70,     80,
  48 };
  49
  50 static const struct mmc_fixup mmc_ext_csd_fixups[] = {
  51         /*
  52          * Certain Hynix eMMC 4.41 cards might get broken when HPI feature
  53          * is used so disable the HPI feature for such buggy cards.
  54          */
  55         MMC_FIXUP_EXT_CSD_REV(CID_NAME_ANY, CID_MANFID_HYNIX,
  56                               0x014a, add_quirk, MMC_QUIRK_BROKEN_HPI, 5),
  57
  58         END_FIXUP
  59 };
  60
  61 #define UNSTUFF_BITS(resp,start,size)                                   \
  62         ({                                                              \
  63                 const int __size = size;                                \
  64                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  65                 const int __off = 3 - ((start) / 32);                   \
  66                 const int __shft = (start) & 31;                        \
  67                 u32 __res;                                              \
  68                                                                         \
  69                 __res = resp[__off] >> __shft;                          \
  70                 if (__size + __shft > 32)                               \
  71                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  72                 __res & __mask;                                         \
  73         })
  74
  75 /*
  76  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  77  */
  78 static int mmc_decode_cid(struct mmc_card *card)
  79 {
  80         u32 *resp = card->raw_cid;
  81
  82         /*
  83          * The selection of the format here is based upon published
  84          * specs from sandisk and from what people have reported.
  85          */
  86         switch (card->csd.mmca_vsn) {
  87         case 0: /* MMC v1.0 - v1.2 */
  88         case 1: /* MMC v1.4 */
  89                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  90                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  91                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  92                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  93                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  94                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  95                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  96                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  97                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  98                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  99                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
 100                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 101                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 102                 break;
 103
 104         case 2: /* MMC v2.0 - v2.2 */
 105         case 3: /* MMC v3.1 - v3.3 */
 106         case 4: /* MMC v4 */
 107                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
 108                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
 109                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
 110                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
 111                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
 112                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
 113                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
 114                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 115                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 116                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 117                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 118                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 119                 break;
 120
 121         default:
 122                 pr_err("%s: card has unknown MMCA version %d\n",
 123                         mmc_hostname(card->host), card->csd.mmca_vsn);
 124                 return -EINVAL;
 125         }
 126
 127         return 0;
 128 }
 129
 130 static void mmc_set_erase_size(struct mmc_card *card)
 131 {
 132         if (card->ext_csd.erase_group_def & 1)
 133                 card->erase_size = card->ext_csd.hc_erase_size;
 134         else
 135                 card->erase_size = card->csd.erase_size;
 136
 137         mmc_init_erase(card);
 138 }
 139
 140 /*
 141  * Given a 128-bit response, decode to our card CSD structure.
 142  */
 143 static int mmc_decode_csd(struct mmc_card *card)
 144 {
 145         struct mmc_csd *csd = &card->csd;
 146         unsigned int e, m, a, b;
 147         u32 *resp = card->raw_csd;
 148
 149         /*
 150          * We only understand CSD structure v1.1 and v1.2.
 151          * v1.2 has extra information in bits 15, 11 and 10.
 152          * We also support eMMC v4.4 & v4.41.
 153          */
 154         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 155         if (csd->structure == 0) {
 156                 pr_err("%s: unrecognised CSD structure version %d\n",
 157                         mmc_hostname(card->host), csd->structure);
 158                 return -EINVAL;
 159         }
 160
 161         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 162         m = UNSTUFF_BITS(resp, 115, 4);
 163         e = UNSTUFF_BITS(resp, 112, 3);
 164         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 165         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 166
 167         m = UNSTUFF_BITS(resp, 99, 4);
 168         e = UNSTUFF_BITS(resp, 96, 3);
 169         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 170         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 171
 172         e = UNSTUFF_BITS(resp, 47, 3);
 173         m = UNSTUFF_BITS(resp, 62, 12);
 174         csd->capacity     = (1 + m) << (e + 2);
 175
 176         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 177         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 178         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 179         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 180         csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 181         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 182         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 183         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 184
 185         if (csd->write_blkbits >= 9) {
 186                 a = UNSTUFF_BITS(resp, 42, 5);
 187                 b = UNSTUFF_BITS(resp, 37, 5);
 188                 csd->erase_size = (a + 1) * (b + 1);
 189                 csd->erase_size <<= csd->write_blkbits - 9;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static void mmc_select_card_type(struct mmc_card *card)
 196 {
 197         struct mmc_host *host = card->host;
 198         u8 card_type = card->ext_csd.raw_card_type;
 199         u32 caps = host->caps, caps2 = host->caps2;
 200         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 201         unsigned int avail_type = 0;
 202
 203         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 204             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 205                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 206                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 207         }
 208
 209         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 210             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 211                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 212                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 213         }
 214
 215         if (caps & MMC_CAP_1_8V_DDR &&
 216             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 217                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 218                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 219         }
 220
 221         if (caps & MMC_CAP_1_2V_DDR &&
 222             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 223                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 224                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 225         }
 226
 227         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 228             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 229                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 230                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 231         }
 232
 233         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 234             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 235                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 236                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 237         }
 238
 239         if (caps2 & MMC_CAP2_HS400_1_8V &&
 240             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 241                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 242                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 243         }
 244
 245         if (caps2 & MMC_CAP2_HS400_1_2V &&
 246             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 247                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 248                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 249         }
 250
 251         if ((caps2 & MMC_CAP2_HS400_ES) &&
 252             card->ext_csd.strobe_support &&
 253             (avail_type & EXT_CSD_CARD_TYPE_HS400))
 254                 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
 255
 256         card->ext_csd.hs_max_dtr = hs_max_dtr;
 257         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 258         card->mmc_avail_type = avail_type;
 259 }
 260
 261 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 262 {
 263         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 264
 265         /*
 266          * Disable these attributes by default
 267          */
 268         card->ext_csd.enhanced_area_offset = -EINVAL;
 269         card->ext_csd.enhanced_area_size = -EINVAL;
 270
 271         /*
 272          * Enhanced area feature support -- check whether the eMMC
 273          * card has the Enhanced area enabled.  If so, export enhanced
 274          * area offset and size to user by adding sysfs interface.
 275          */
 276         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 277             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 278                 if (card->ext_csd.partition_setting_completed) {
 279                         hc_erase_grp_sz =
 280                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 281                         hc_wp_grp_sz =
 282                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 283
 284                         /*
 285                          * calculate the enhanced data area offset, in bytes
 286                          */
 287                         card->ext_csd.enhanced_area_offset =
 288                                 (((unsigned long long)ext_csd[139]) << 24) +
 289                                 (((unsigned long long)ext_csd[138]) << 16) +
 290                                 (((unsigned long long)ext_csd[137]) << 8) +
 291                                 (((unsigned long long)ext_csd[136]));
 292                         if (mmc_card_blockaddr(card))
 293                                 card->ext_csd.enhanced_area_offset <<= 9;
 294                         /*
 295                          * calculate the enhanced data area size, in kilobytes
 296                          */
 297                         card->ext_csd.enhanced_area_size =
 298                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 299                                 ext_csd[140];
 300                         card->ext_csd.enhanced_area_size *=
 301                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 302                         card->ext_csd.enhanced_area_size <<= 9;
 303                 } else {
 304                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 305                                 mmc_hostname(card->host));
 306                 }
 307         }
 308 }
 309
 310 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 311 {
 312         int idx;
 313         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 314         unsigned int part_size;
 315
 316         /*
 317          * General purpose partition feature support --
 318          * If ext_csd has the size of general purpose partitions,
 319          * set size, part_cfg, partition name in mmc_part.
 320          */
 321         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 322             EXT_CSD_PART_SUPPORT_PART_EN) {
 323                 hc_erase_grp_sz =
 324                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 325                 hc_wp_grp_sz =
 326                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 327
 328                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 329                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 330                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 331                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 332                                 continue;
 333                         if (card->ext_csd.partition_setting_completed == 0) {
 334                                 pr_warn("%s: has partition size defined without partition complete\n",
 335                                         mmc_hostname(card->host));
 336                                 break;
 337                         }
 338                         part_size =
 339                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 340                                 << 16) +
 341                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 342                                 << 8) +
 343                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 344                         part_size *= (size_t)(hc_erase_grp_sz *
 345                                 hc_wp_grp_sz);
 346                         mmc_part_add(card, part_size << 19,
 347                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 348                                 "gp%d", idx, false,
 349                                 MMC_BLK_DATA_AREA_GP);
 350                 }
 351         }
 352 }
 353
 354 /* Minimum partition switch timeout in milliseconds */
 355 #define MMC_MIN_PART_SWITCH_TIME        300
 356
 357 /*
 358  * Decode extended CSD.
 359  */
 360 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 361 {
 362         int err = 0, idx;
 363         unsigned int part_size;
 364         struct device_node *np;
 365         bool broken_hpi = false;
 366
 367         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 368         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 369         if (card->csd.structure == 3) {
 370                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 371                         pr_err("%s: unrecognised EXT_CSD structure "
 372                                 "version %d\n", mmc_hostname(card->host),
 373                                         card->ext_csd.raw_ext_csd_structure);
 374                         err = -EINVAL;
 375                         goto out;
 376                 }
 377         }
 378
 379         np = mmc_of_find_child_device(card->host, 0);
 380         if (np && of_device_is_compatible(np, "mmc-card"))
 381                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 382         of_node_put(np);
 383
 384         /*
 385          * The EXT_CSD format is meant to be forward compatible. As long
 386          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 387          * are authorized, see JEDEC JESD84-B50 section B.8.
 388          */
 389         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 390
 391         /* fixup device after ext_csd revision field is updated */
 392         mmc_fixup_device(card, mmc_ext_csd_fixups);
 393
 394         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 395         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 396         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 397         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 398         if (card->ext_csd.rev >= 2) {
 399                 card->ext_csd.sectors =
 400                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 401                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 402                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 403                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 404
 405                 /* Cards with density > 2GiB are sector addressed */
 406                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 407                         mmc_card_set_blockaddr(card);
 408         }
 409
 410         card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
 411         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 412         mmc_select_card_type(card);
 413
 414         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 415         card->ext_csd.raw_erase_timeout_mult =
 416                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 417         card->ext_csd.raw_hc_erase_grp_size =
 418                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 419         if (card->ext_csd.rev >= 3) {
 420                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 421                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 422
 423                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 424                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 425                 /* Some eMMC set the value too low so set a minimum */
 426                 if (card->ext_csd.part_time &&
 427                     card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
 428                         card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
 429
 430                 /* Sleep / awake timeout in 100ns units */
 431                 if (sa_shift > 0 && sa_shift <= 0x17)
 432                         card->ext_csd.sa_timeout =
 433                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 434                 card->ext_csd.erase_group_def =
 435                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 436                 card->ext_csd.hc_erase_timeout = 300 *
 437                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 438                 card->ext_csd.hc_erase_size =
 439                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 440
 441                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 442
 443                 /*
 444                  * There are two boot regions of equal size, defined in
 445                  * multiples of 128K.
 446                  */
 447                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 448                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 449                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 450                                 mmc_part_add(card, part_size,
 451                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 452                                         "boot%d", idx, true,
 453                                         MMC_BLK_DATA_AREA_BOOT);
 454                         }
 455                 }
 456         }
 457
 458         card->ext_csd.raw_hc_erase_gap_size =
 459                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 460         card->ext_csd.raw_sec_trim_mult =
 461                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 462         card->ext_csd.raw_sec_erase_mult =
 463                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 464         card->ext_csd.raw_sec_feature_support =
 465                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 466         card->ext_csd.raw_trim_mult =
 467                 ext_csd[EXT_CSD_TRIM_MULT];
 468         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 469         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 470         if (card->ext_csd.rev >= 4) {
 471                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 472                     EXT_CSD_PART_SETTING_COMPLETED)
 473                         card->ext_csd.partition_setting_completed = 1;
 474                 else
 475                         card->ext_csd.partition_setting_completed = 0;
 476
 477                 mmc_manage_enhanced_area(card, ext_csd);
 478
 479                 mmc_manage_gp_partitions(card, ext_csd);
 480
 481                 card->ext_csd.sec_trim_mult =
 482                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 483                 card->ext_csd.sec_erase_mult =
 484                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 485                 card->ext_csd.sec_feature_support =
 486                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 487                 card->ext_csd.trim_timeout = 300 *
 488                         ext_csd[EXT_CSD_TRIM_MULT];
 489
 490                 /*
 491                  * Note that the call to mmc_part_add above defaults to read
 492                  * only. If this default assumption is changed, the call must
 493                  * take into account the value of boot_locked below.
 494                  */
 495                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 496                 card->ext_csd.boot_ro_lockable = true;
 497
 498                 /* Save power class values */
 499                 card->ext_csd.raw_pwr_cl_52_195 =
 500                         ext_csd[EXT_CSD_PWR_CL_52_195];
 501                 card->ext_csd.raw_pwr_cl_26_195 =
 502                         ext_csd[EXT_CSD_PWR_CL_26_195];
 503                 card->ext_csd.raw_pwr_cl_52_360 =
 504                         ext_csd[EXT_CSD_PWR_CL_52_360];
 505                 card->ext_csd.raw_pwr_cl_26_360 =
 506                         ext_csd[EXT_CSD_PWR_CL_26_360];
 507                 card->ext_csd.raw_pwr_cl_200_195 =
 508                         ext_csd[EXT_CSD_PWR_CL_200_195];
 509                 card->ext_csd.raw_pwr_cl_200_360 =
 510                         ext_csd[EXT_CSD_PWR_CL_200_360];
 511                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 512                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 513                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 514                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 515                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 516                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 517         }
 518
 519         if (card->ext_csd.rev >= 5) {
 520                 /* Adjust production date as per JEDEC JESD84-B451 */
 521                 if (card->cid.year < 2010)
 522                         card->cid.year += 16;
 523
 524                 /* check whether the eMMC card supports BKOPS */
 525                 if (!mmc_card_broken_hpi(card) &&
 526                     ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 527                         card->ext_csd.bkops = 1;
 528                         card->ext_csd.man_bkops_en =
 529                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 530                                                 EXT_CSD_MANUAL_BKOPS_MASK);
 531                         card->ext_csd.raw_bkops_status =
 532                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 533                         if (!card->ext_csd.man_bkops_en)
 534                                 pr_debug("%s: MAN_BKOPS_EN bit is not set\n",
 535                                         mmc_hostname(card->host));
 536                 }
 537
 538                 /* check whether the eMMC card supports HPI */
 539                 if (!mmc_card_broken_hpi(card) &&
 540                     !broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
 541                         card->ext_csd.hpi = 1;
 542                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 543                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 544                         else
 545                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 546                         /*
 547                          * Indicate the maximum timeout to close
 548                          * a command interrupted by HPI
 549                          */
 550                         card->ext_csd.out_of_int_time =
 551                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 552                 }
 553
 554                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 555                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 556
 557                 /*
 558                  * RPMB regions are defined in multiples of 128K.
 559                  */
 560                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 561                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 562                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 563                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 564                                 "rpmb", 0, false,
 565                                 MMC_BLK_DATA_AREA_RPMB);
 566                 }
 567         }
 568
 569         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 570         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 571                 card->erased_byte = 0xFF;
 572         else
 573                 card->erased_byte = 0x0;
 574
 575         /* eMMC v4.5 or later */
 576         card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
 577         if (card->ext_csd.rev >= 6) {
 578                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 579
 580                 card->ext_csd.generic_cmd6_time = 10 *
 581                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 582                 card->ext_csd.power_off_longtime = 10 *
 583                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 584
 585                 card->ext_csd.cache_size =
 586                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 587                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 588                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 589                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 590
 591                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 592                         card->ext_csd.data_sector_size = 4096;
 593                 else
 594                         card->ext_csd.data_sector_size = 512;
 595
 596                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 597                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 598                         card->ext_csd.data_tag_unit_size =
 599                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 600                         (card->ext_csd.data_sector_size);
 601                 } else {
 602                         card->ext_csd.data_tag_unit_size = 0;
 603                 }
 604
 605                 card->ext_csd.max_packed_writes =
 606                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 607                 card->ext_csd.max_packed_reads =
 608                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 609         } else {
 610                 card->ext_csd.data_sector_size = 512;
 611         }
 612
 613         /* eMMC v5 or later */
 614         if (card->ext_csd.rev >= 7) {
 615                 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
 616                        MMC_FIRMWARE_LEN);
 617                 card->ext_csd.ffu_capable =
 618                         (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
 619                         !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
 620         }
 621
 622         /* eMMC v5.1 or later */
 623         if (card->ext_csd.rev >= 8) {
 624                 card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
 625                                              EXT_CSD_CMDQ_SUPPORTED;
 626                 card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
 627                                             EXT_CSD_CMDQ_DEPTH_MASK) + 1;
 628                 /* Exclude inefficiently small queue depths */
 629                 if (card->ext_csd.cmdq_depth <= 2) {
 630                         card->ext_csd.cmdq_support = false;
 631                         card->ext_csd.cmdq_depth = 0;
 632                 }
 633                 if (card->ext_csd.cmdq_support) {
 634                         pr_debug("%s: Command Queue supported depth %u\n",
 635                                  mmc_hostname(card->host),
 636                                  card->ext_csd.cmdq_depth);
 637                 }
 638         }
 639 out:
 640         return err;
 641 }
 642
 643 static int mmc_read_ext_csd(struct mmc_card *card)
 644 {
 645         u8 *ext_csd;
 646         int err;
 647
 648         if (!mmc_can_ext_csd(card))
 649                 return 0;
 650
 651         err = mmc_get_ext_csd(card, &ext_csd);
 652         if (err) {
 653                 /* If the host or the card can't do the switch,
 654                  * fail more gracefully. */
 655                 if ((err != -EINVAL)
 656                  && (err != -ENOSYS)
 657                  && (err != -EFAULT))
 658                         return err;
 659
 660                 /*
 661                  * High capacity cards should have this "magic" size
 662                  * stored in their CSD.
 663                  */
 664                 if (card->csd.capacity == (4096 * 512)) {
 665                         pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
 666                                 mmc_hostname(card->host));
 667                 } else {
 668                         pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
 669                                 mmc_hostname(card->host));
 670                         err = 0;
 671                 }
 672
 673                 return err;
 674         }
 675
 676         err = mmc_decode_ext_csd(card, ext_csd);
 677         kfree(ext_csd);
 678         return err;
 679 }
 680
 681 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 682 {
 683         u8 *bw_ext_csd;
 684         int err;
 685
 686         if (bus_width == MMC_BUS_WIDTH_1)
 687                 return 0;
 688
 689         err = mmc_get_ext_csd(card, &bw_ext_csd);
 690         if (err)
 691                 return err;
 692
 693         /* only compare read only fields */
 694         err = !((card->ext_csd.raw_partition_support ==
 695                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 696                 (card->ext_csd.raw_erased_mem_count ==
 697                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 698                 (card->ext_csd.rev ==
 699                         bw_ext_csd[EXT_CSD_REV]) &&
 700                 (card->ext_csd.raw_ext_csd_structure ==
 701                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 702                 (card->ext_csd.raw_card_type ==
 703                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 704                 (card->ext_csd.raw_s_a_timeout ==
 705                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 706                 (card->ext_csd.raw_hc_erase_gap_size ==
 707                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 708                 (card->ext_csd.raw_erase_timeout_mult ==
 709                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 710                 (card->ext_csd.raw_hc_erase_grp_size ==
 711                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 712                 (card->ext_csd.raw_sec_trim_mult ==
 713                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 714                 (card->ext_csd.raw_sec_erase_mult ==
 715                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 716                 (card->ext_csd.raw_sec_feature_support ==
 717                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 718                 (card->ext_csd.raw_trim_mult ==
 719                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 720                 (card->ext_csd.raw_sectors[0] ==
 721                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 722                 (card->ext_csd.raw_sectors[1] ==
 723                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 724                 (card->ext_csd.raw_sectors[2] ==
 725                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 726                 (card->ext_csd.raw_sectors[3] ==
 727                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 728                 (card->ext_csd.raw_pwr_cl_52_195 ==
 729                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 730                 (card->ext_csd.raw_pwr_cl_26_195 ==
 731                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 732                 (card->ext_csd.raw_pwr_cl_52_360 ==
 733                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 734                 (card->ext_csd.raw_pwr_cl_26_360 ==
 735                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 736                 (card->ext_csd.raw_pwr_cl_200_195 ==
 737                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 738                 (card->ext_csd.raw_pwr_cl_200_360 ==
 739                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 740                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 741                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 742                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 743                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 744                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 745                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 746
 747         if (err)
 748                 err = -EINVAL;
 749
 750         kfree(bw_ext_csd);
 751         return err;
 752 }
 753
 754 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 755         card->raw_cid[2], card->raw_cid[3]);
 756 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 757         card->raw_csd[2], card->raw_csd[3]);
 758 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 759 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 760 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 761 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 762 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 763 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 764 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 765 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 766 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 767 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 768 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 769                 card->ext_csd.enhanced_area_offset);
 770 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 771 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 772 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 773 MMC_DEV_ATTR(ocr, "%08x\n", card->ocr);
 774
 775 static ssize_t mmc_fwrev_show(struct device *dev,
 776                               struct device_attribute *attr,
 777                               char *buf)
 778 {
 779         struct mmc_card *card = mmc_dev_to_card(dev);
 780
 781         if (card->ext_csd.rev < 7) {
 782                 return sprintf(buf, "0x%x\n", card->cid.fwrev);
 783         } else {
 784                 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
 785                                card->ext_csd.fwrev);
 786         }
 787 }
 788
 789 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
 790
 791 static ssize_t mmc_dsr_show(struct device *dev,
 792                             struct device_attribute *attr,
 793                             char *buf)
 794 {
 795         struct mmc_card *card = mmc_dev_to_card(dev);
 796         struct mmc_host *host = card->host;
 797
 798         if (card->csd.dsr_imp && host->dsr_req)
 799                 return sprintf(buf, "0x%x\n", host->dsr);
 800         else
 801                 /* return default DSR value */
 802                 return sprintf(buf, "0x%x\n", 0x404);
 803 }
 804
 805 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
 806
 807 static struct attribute *mmc_std_attrs[] = {
 808         &dev_attr_cid.attr,
 809         &dev_attr_csd.attr,
 810         &dev_attr_date.attr,
 811         &dev_attr_erase_size.attr,
 812         &dev_attr_preferred_erase_size.attr,
 813         &dev_attr_fwrev.attr,
 814         &dev_attr_ffu_capable.attr,
 815         &dev_attr_hwrev.attr,
 816         &dev_attr_manfid.attr,
 817         &dev_attr_name.attr,
 818         &dev_attr_oemid.attr,
 819         &dev_attr_prv.attr,
 820         &dev_attr_serial.attr,
 821         &dev_attr_enhanced_area_offset.attr,
 822         &dev_attr_enhanced_area_size.attr,
 823         &dev_attr_raw_rpmb_size_mult.attr,
 824         &dev_attr_rel_sectors.attr,
 825         &dev_attr_ocr.attr,
 826         &dev_attr_dsr.attr,
 827         NULL,
 828 };
 829 ATTRIBUTE_GROUPS(mmc_std);
 830
 831 static struct device_type mmc_type = {
 832         .groups = mmc_std_groups,
 833 };
 834
 835 /*
 836  * Select the PowerClass for the current bus width
 837  * If power class is defined for 4/8 bit bus in the
 838  * extended CSD register, select it by executing the
 839  * mmc_switch command.
 840  */
 841 static int __mmc_select_powerclass(struct mmc_card *card,
 842                                    unsigned int bus_width)
 843 {
 844         struct mmc_host *host = card->host;
 845         struct mmc_ext_csd *ext_csd = &card->ext_csd;
 846         unsigned int pwrclass_val = 0;
 847         int err = 0;
 848
 849         switch (1 << host->ios.vdd) {
 850         case MMC_VDD_165_195:
 851                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 852                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
 853                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 854                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 855                                 ext_csd->raw_pwr_cl_52_195 :
 856                                 ext_csd->raw_pwr_cl_ddr_52_195;
 857                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 858                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
 859                 break;
 860         case MMC_VDD_27_28:
 861         case MMC_VDD_28_29:
 862         case MMC_VDD_29_30:
 863         case MMC_VDD_30_31:
 864         case MMC_VDD_31_32:
 865         case MMC_VDD_32_33:
 866         case MMC_VDD_33_34:
 867         case MMC_VDD_34_35:
 868         case MMC_VDD_35_36:
 869                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 870                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
 871                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 872                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 873                                 ext_csd->raw_pwr_cl_52_360 :
 874                                 ext_csd->raw_pwr_cl_ddr_52_360;
 875                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 876                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
 877                                 ext_csd->raw_pwr_cl_ddr_200_360 :
 878                                 ext_csd->raw_pwr_cl_200_360;
 879                 break;
 880         default:
 881                 pr_warn("%s: Voltage range not supported for power class\n",
 882                         mmc_hostname(host));
 883                 return -EINVAL;
 884         }
 885
 886         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 887                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 888                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 889         else
 890                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 891                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 892
 893         /* If the power class is different from the default value */
 894         if (pwrclass_val > 0) {
 895                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 896                                  EXT_CSD_POWER_CLASS,
 897                                  pwrclass_val,
 898                                  card->ext_csd.generic_cmd6_time);
 899         }
 900
 901         return err;
 902 }
 903
 904 static int mmc_select_powerclass(struct mmc_card *card)
 905 {
 906         struct mmc_host *host = card->host;
 907         u32 bus_width, ext_csd_bits;
 908         int err, ddr;
 909
 910         /* Power class selection is supported for versions >= 4.0 */
 911         if (!mmc_can_ext_csd(card))
 912                 return 0;
 913
 914         bus_width = host->ios.bus_width;
 915         /* Power class values are defined only for 4/8 bit bus */
 916         if (bus_width == MMC_BUS_WIDTH_1)
 917                 return 0;
 918
 919         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 920         if (ddr)
 921                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 922                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 923         else
 924                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 925                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
 926
 927         err = __mmc_select_powerclass(card, ext_csd_bits);
 928         if (err)
 929                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
 930                         mmc_hostname(host), 1 << bus_width, ddr);
 931
 932         return err;
 933 }
 934
 935 /*
 936  * Set the bus speed for the selected speed mode.
 937  */
 938 static void mmc_set_bus_speed(struct mmc_card *card)
 939 {
 940         unsigned int max_dtr = (unsigned int)-1;
 941
 942         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
 943              max_dtr > card->ext_csd.hs200_max_dtr)
 944                 max_dtr = card->ext_csd.hs200_max_dtr;
 945         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
 946                 max_dtr = card->ext_csd.hs_max_dtr;
 947         else if (max_dtr > card->csd.max_dtr)
 948                 max_dtr = card->csd.max_dtr;
 949
 950         mmc_set_clock(card->host, max_dtr);
 951 }
 952
 953 /*
 954  * Select the bus width amoung 4-bit and 8-bit(SDR).
 955  * If the bus width is changed successfully, return the selected width value.
 956  * Zero is returned instead of error value if the wide width is not supported.
 957  */
 958 static int mmc_select_bus_width(struct mmc_card *card)
 959 {
 960         static unsigned ext_csd_bits[] = {
 961                 EXT_CSD_BUS_WIDTH_8,
 962                 EXT_CSD_BUS_WIDTH_4,
 963         };
 964         static unsigned bus_widths[] = {
 965                 MMC_BUS_WIDTH_8,
 966                 MMC_BUS_WIDTH_4,
 967         };
 968         struct mmc_host *host = card->host;
 969         unsigned idx, bus_width = 0;
 970         int err = 0;
 971
 972         if (!mmc_can_ext_csd(card) ||
 973             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
 974                 return 0;
 975
 976         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
 977
 978         /*
 979          * Unlike SD, MMC cards dont have a configuration register to notify
 980          * supported bus width. So bus test command should be run to identify
 981          * the supported bus width or compare the ext csd values of current
 982          * bus width and ext csd values of 1 bit mode read earlier.
 983          */
 984         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 985                 /*
 986                  * Host is capable of 8bit transfer, then switch
 987                  * the device to work in 8bit transfer mode. If the
 988                  * mmc switch command returns error then switch to
 989                  * 4bit transfer mode. On success set the corresponding
 990                  * bus width on the host.
 991                  */
 992                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 993                                  EXT_CSD_BUS_WIDTH,
 994                                  ext_csd_bits[idx],
 995                                  card->ext_csd.generic_cmd6_time);
 996                 if (err)
 997                         continue;
 998
 999                 bus_width = bus_widths[idx];
1000                 mmc_set_bus_width(host, bus_width);
1001
1002                 /*
1003                  * If controller can't handle bus width test,
1004                  * compare ext_csd previously read in 1 bit mode
1005                  * against ext_csd at new bus width
1006                  */
1007                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1008                         err = mmc_compare_ext_csds(card, bus_width);
1009                 else
1010                         err = mmc_bus_test(card, bus_width);
1011
1012                 if (!err) {
1013                         err = bus_width;
1014                         break;
1015                 } else {
1016                         pr_warn("%s: switch to bus width %d failed\n",
1017                                 mmc_hostname(host), 1 << bus_width);
1018                 }
1019         }
1020
1021         return err;
1022 }
1023
1024 /*
1025  * Switch to the high-speed mode
1026  */
1027 static int mmc_select_hs(struct mmc_card *card)
1028 {
1029         int err;
1030
1031         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1032                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1033                            card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
1034                            true, true, true);
1035         if (err)
1036                 pr_warn("%s: switch to high-speed failed, err:%d\n",
1037                         mmc_hostname(card->host), err);
1038
1039         return err;
1040 }
1041
1042 /*
1043  * Activate wide bus and DDR if supported.
1044  */
1045 static int mmc_select_hs_ddr(struct mmc_card *card)
1046 {
1047         struct mmc_host *host = card->host;
1048         u32 bus_width, ext_csd_bits;
1049         int err = 0;
1050
1051         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1052                 return 0;
1053
1054         bus_width = host->ios.bus_width;
1055         if (bus_width == MMC_BUS_WIDTH_1)
1056                 return 0;
1057
1058         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1059                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1060
1061         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1062                            EXT_CSD_BUS_WIDTH,
1063                            ext_csd_bits,
1064                            card->ext_csd.generic_cmd6_time,
1065                            MMC_TIMING_MMC_DDR52,
1066                            true, true, true);
1067         if (err) {
1068                 pr_err("%s: switch to bus width %d ddr failed\n",
1069                         mmc_hostname(host), 1 << bus_width);
1070                 return err;
1071         }
1072
1073         /*
1074          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1075          * signaling.
1076          *
1077          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1078          *
1079          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1080          * in the JEDEC spec for DDR.
1081          *
1082          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1083          * host controller can support this, like some of the SDHCI
1084          * controller which connect to an eMMC device. Some of these
1085          * host controller still needs to use 1.8v vccq for supporting
1086          * DDR mode.
1087          *
1088          * So the sequence will be:
1089          * if (host and device can both support 1.2v IO)
1090          *      use 1.2v IO;
1091          * else if (host and device can both support 1.8v IO)
1092          *      use 1.8v IO;
1093          * so if host and device can only support 3.3v IO, this is the
1094          * last choice.
1095          *
1096          * WARNING: eMMC rules are NOT the same as SD DDR
1097          */
1098         err = -EINVAL;
1099         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1100                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1101
1102         if (err && (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V))
1103                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1104
1105         /* make sure vccq is 3.3v after switching disaster */
1106         if (err)
1107                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1108
1109         return err;
1110 }
1111
1112 static int mmc_select_hs400(struct mmc_card *card)
1113 {
1114         struct mmc_host *host = card->host;
1115         unsigned int max_dtr;
1116         int err = 0;
1117         u8 val;
1118
1119         /*
1120          * HS400 mode requires 8-bit bus width
1121          */
1122         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1123               host->ios.bus_width == MMC_BUS_WIDTH_8))
1124                 return 0;
1125
1126         /* Switch card to HS mode */
1127         val = EXT_CSD_TIMING_HS;
1128         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1129                            EXT_CSD_HS_TIMING, val,
1130                            card->ext_csd.generic_cmd6_time, 0,
1131                            true, false, true);
1132         if (err) {
1133                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1134                         mmc_hostname(host), err);
1135                 return err;
1136         }
1137
1138         /* Set host controller to HS timing */
1139         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1140
1141         /* Reduce frequency to HS frequency */
1142         max_dtr = card->ext_csd.hs_max_dtr;
1143         mmc_set_clock(host, max_dtr);
1144
1145         err = mmc_switch_status(card);
1146         if (err)
1147                 goto out_err;
1148
1149         /* Switch card to DDR */
1150         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1151                          EXT_CSD_BUS_WIDTH,
1152                          EXT_CSD_DDR_BUS_WIDTH_8,
1153                          card->ext_csd.generic_cmd6_time);
1154         if (err) {
1155                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1156                         mmc_hostname(host), err);
1157                 return err;
1158         }
1159
1160         /* Switch card to HS400 */
1161         val = EXT_CSD_TIMING_HS400 |
1162               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1163         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1164                            EXT_CSD_HS_TIMING, val,
1165                            card->ext_csd.generic_cmd6_time, 0,
1166                            true, false, true);
1167         if (err) {
1168                 pr_err("%s: switch to hs400 failed, err:%d\n",
1169                          mmc_hostname(host), err);
1170                 return err;
1171         }
1172
1173         /* Set host controller to HS400 timing and frequency */
1174         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1175         mmc_set_bus_speed(card);
1176
1177         err = mmc_switch_status(card);
1178         if (err)
1179                 goto out_err;
1180
1181         return 0;
1182
1183 out_err:
1184         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1185                __func__, err);
1186         return err;
1187 }
1188
1189 int mmc_hs200_to_hs400(struct mmc_card *card)
1190 {
1191         return mmc_select_hs400(card);
1192 }
1193
1194 int mmc_hs400_to_hs200(struct mmc_card *card)
1195 {
1196         struct mmc_host *host = card->host;
1197         unsigned int max_dtr;
1198         int err;
1199         u8 val;
1200
1201         /* Reduce frequency to HS */
1202         max_dtr = card->ext_csd.hs_max_dtr;
1203         mmc_set_clock(host, max_dtr);
1204
1205         /* Switch HS400 to HS DDR */
1206         val = EXT_CSD_TIMING_HS;
1207         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1208                            val, card->ext_csd.generic_cmd6_time, 0,
1209                            true, false, true);
1210         if (err)
1211                 goto out_err;
1212
1213         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1214
1215         err = mmc_switch_status(card);
1216         if (err)
1217                 goto out_err;
1218
1219         /* Switch HS DDR to HS */
1220         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1221                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1222                            0, true, false, true);
1223         if (err)
1224                 goto out_err;
1225
1226         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1227
1228         err = mmc_switch_status(card);
1229         if (err)
1230                 goto out_err;
1231
1232         /* Switch HS to HS200 */
1233         val = EXT_CSD_TIMING_HS200 |
1234               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1235         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1236                            val, card->ext_csd.generic_cmd6_time, 0,
1237                            true, false, true);
1238         if (err)
1239                 goto out_err;
1240
1241         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1242
1243         err = mmc_switch_status(card);
1244         if (err)
1245                 goto out_err;
1246
1247         mmc_set_bus_speed(card);
1248
1249         return 0;
1250
1251 out_err:
1252         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1253                __func__, err);
1254         return err;
1255 }
1256
1257 static int mmc_select_hs400es(struct mmc_card *card)
1258 {
1259         struct mmc_host *host = card->host;
1260         int err = 0;
1261         u8 val;
1262
1263         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1264                 err = -ENOTSUPP;
1265                 goto out_err;
1266         }
1267
1268         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1269                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1270
1271         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1272                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1273
1274         /* If fails try again during next card power cycle */
1275         if (err)
1276                 goto out_err;
1277
1278         err = mmc_select_bus_width(card);
1279         if (err < 0)
1280                 goto out_err;
1281
1282         /* Switch card to HS mode */
1283         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1284                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1285                            card->ext_csd.generic_cmd6_time, 0,
1286                            true, false, true);
1287         if (err) {
1288                 pr_err("%s: switch to hs for hs400es failed, err:%d\n",
1289                         mmc_hostname(host), err);
1290                 goto out_err;
1291         }
1292
1293         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1294         err = mmc_switch_status(card);
1295         if (err)
1296                 goto out_err;
1297
1298         mmc_set_clock(host, card->ext_csd.hs_max_dtr);
1299
1300         /* Switch card to DDR with strobe bit */
1301         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1302         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1303                          EXT_CSD_BUS_WIDTH,
1304                          val,
1305                          card->ext_csd.generic_cmd6_time);
1306         if (err) {
1307                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1308                         mmc_hostname(host), err);
1309                 goto out_err;
1310         }
1311
1312         /* Switch card to HS400 */
1313         val = EXT_CSD_TIMING_HS400 |
1314               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1315         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1316                            EXT_CSD_HS_TIMING, val,
1317                            card->ext_csd.generic_cmd6_time, 0,
1318                            true, false, true);
1319         if (err) {
1320                 pr_err("%s: switch to hs400es failed, err:%d\n",
1321                         mmc_hostname(host), err);
1322                 goto out_err;
1323         }
1324
1325         /* Set host controller to HS400 timing and frequency */
1326         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1327
1328         /* Controller enable enhanced strobe function */
1329         host->ios.enhanced_strobe = true;
1330         if (host->ops->hs400_enhanced_strobe)
1331                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1332
1333         err = mmc_switch_status(card);
1334         if (err)
1335                 goto out_err;
1336
1337         return 0;
1338
1339 out_err:
1340         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1341                __func__, err);
1342         return err;
1343 }
1344
1345 static void mmc_select_driver_type(struct mmc_card *card)
1346 {
1347         int card_drv_type, drive_strength, drv_type;
1348
1349         card_drv_type = card->ext_csd.raw_driver_strength |
1350                         mmc_driver_type_mask(0);
1351
1352         drive_strength = mmc_select_drive_strength(card,
1353                                                    card->ext_csd.hs200_max_dtr,
1354                                                    card_drv_type, &drv_type);
1355
1356         card->drive_strength = drive_strength;
1357
1358         if (drv_type)
1359                 mmc_set_driver_type(card->host, drv_type);
1360 }
1361
1362 /*
1363  * For device supporting HS200 mode, the following sequence
1364  * should be done before executing the tuning process.
1365  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1366  * 2. switch to HS200 mode
1367  * 3. set the clock to > 52Mhz and <=200MHz
1368  */
1369 static int mmc_select_hs200(struct mmc_card *card)
1370 {
1371         struct mmc_host *host = card->host;
1372         unsigned int old_timing, old_signal_voltage;
1373         int err = -EINVAL;
1374         u8 val;
1375
1376         old_signal_voltage = host->ios.signal_voltage;
1377         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1378                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1379
1380         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1381                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1382
1383         /* If fails try again during next card power cycle */
1384         if (err)
1385                 return err;
1386
1387         mmc_select_driver_type(card);
1388
1389         /*
1390          * Set the bus width(4 or 8) with host's support and
1391          * switch to HS200 mode if bus width is set successfully.
1392          */
1393         err = mmc_select_bus_width(card);
1394         if (err > 0) {
1395                 val = EXT_CSD_TIMING_HS200 |
1396                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1397                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1398                                    EXT_CSD_HS_TIMING, val,
1399                                    card->ext_csd.generic_cmd6_time, 0,
1400                                    true, false, true);
1401                 if (err)
1402                         goto err;
1403                 old_timing = host->ios.timing;
1404                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1405
1406                 err = mmc_switch_status(card);
1407                 /*
1408                  * mmc_select_timing() assumes timing has not changed if
1409                  * it is a switch error.
1410                  */
1411                 if (err == -EBADMSG)
1412                         mmc_set_timing(host, old_timing);
1413         }
1414 err:
1415         if (err) {
1416                 /* fall back to the old signal voltage, if fails report error */
1417                 if (__mmc_set_signal_voltage(host, old_signal_voltage))
1418                         err = -EIO;
1419
1420                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1421                        __func__, err);
1422         }
1423         return err;
1424 }
1425
1426 /*
1427  * Activate High Speed, HS200 or HS400ES mode if supported.
1428  */
1429 static int mmc_select_timing(struct mmc_card *card)
1430 {
1431         int err = 0;
1432
1433         if (!mmc_can_ext_csd(card))
1434                 goto bus_speed;
1435
1436         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1437                 err = mmc_select_hs400es(card);
1438         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1439                 err = mmc_select_hs200(card);
1440         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1441                 err = mmc_select_hs(card);
1442
1443         if (err && err != -EBADMSG)
1444                 return err;
1445
1446 bus_speed:
1447         /*
1448          * Set the bus speed to the selected bus timing.
1449          * If timing is not selected, backward compatible is the default.
1450          */
1451         mmc_set_bus_speed(card);
1452         return 0;
1453 }
1454
1455 /*
1456  * Execute tuning sequence to seek the proper bus operating
1457  * conditions for HS200 and HS400, which sends CMD21 to the device.
1458  */
1459 static int mmc_hs200_tuning(struct mmc_card *card)
1460 {
1461         struct mmc_host *host = card->host;
1462
1463         /*
1464          * Timing should be adjusted to the HS400 target
1465          * operation frequency for tuning process
1466          */
1467         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1468             host->ios.bus_width == MMC_BUS_WIDTH_8)
1469                 if (host->ops->prepare_hs400_tuning)
1470                         host->ops->prepare_hs400_tuning(host, &host->ios);
1471
1472         return mmc_execute_tuning(card);
1473 }
1474
1475 /*
1476  * Handle the detection and initialisation of a card.
1477  *
1478  * In the case of a resume, "oldcard" will contain the card
1479  * we're trying to reinitialise.
1480  */
1481 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1482         struct mmc_card *oldcard)
1483 {
1484         struct mmc_card *card;
1485         int err;
1486         u32 cid[4];
1487         u32 rocr;
1488
1489         BUG_ON(!host);
1490         WARN_ON(!host->claimed);
1491
1492         /* Set correct bus mode for MMC before attempting init */
1493         if (!mmc_host_is_spi(host))
1494                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1495
1496         /*
1497          * Since we're changing the OCR value, we seem to
1498          * need to tell some cards to go back to the idle
1499          * state.  We wait 1ms to give cards time to
1500          * respond.
1501          * mmc_go_idle is needed for eMMC that are asleep
1502          */
1503         mmc_go_idle(host);
1504
1505         /* The extra bit indicates that we support high capacity */
1506         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1507         if (err)
1508                 goto err;
1509
1510         /*
1511          * For SPI, enable CRC as appropriate.
1512          */
1513         if (mmc_host_is_spi(host)) {
1514                 err = mmc_spi_set_crc(host, use_spi_crc);
1515                 if (err)
1516                         goto err;
1517         }
1518
1519         /*
1520          * Fetch CID from card.
1521          */
1522         if (mmc_host_is_spi(host))
1523                 err = mmc_send_cid(host, cid);
1524         else
1525                 err = mmc_all_send_cid(host, cid);
1526         if (err)
1527                 goto err;
1528
1529         if (oldcard) {
1530                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1531                         err = -ENOENT;
1532                         goto err;
1533                 }
1534
1535                 card = oldcard;
1536         } else {
1537                 /*
1538                  * Allocate card structure.
1539                  */
1540                 card = mmc_alloc_card(host, &mmc_type);
1541                 if (IS_ERR(card)) {
1542                         err = PTR_ERR(card);
1543                         goto err;
1544                 }
1545
1546                 card->ocr = ocr;
1547                 card->type = MMC_TYPE_MMC;
1548                 card->rca = 1;
1549                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1550         }
1551
1552         /*
1553          * Call the optional HC's init_card function to handle quirks.
1554          */
1555         if (host->ops->init_card)
1556                 host->ops->init_card(host, card);
1557
1558         /*
1559          * For native busses:  set card RCA and quit open drain mode.
1560          */
1561         if (!mmc_host_is_spi(host)) {
1562                 err = mmc_set_relative_addr(card);
1563                 if (err)
1564                         goto free_card;
1565
1566                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1567         }
1568
1569         if (!oldcard) {
1570                 /*
1571                  * Fetch CSD from card.
1572                  */
1573                 err = mmc_send_csd(card, card->raw_csd);
1574                 if (err)
1575                         goto free_card;
1576
1577                 err = mmc_decode_csd(card);
1578                 if (err)
1579                         goto free_card;
1580                 err = mmc_decode_cid(card);
1581                 if (err)
1582                         goto free_card;
1583         }
1584
1585         /*
1586          * handling only for cards supporting DSR and hosts requesting
1587          * DSR configuration
1588          */
1589         if (card->csd.dsr_imp && host->dsr_req)
1590                 mmc_set_dsr(host);
1591
1592         /*
1593          * Select card, as all following commands rely on that.
1594          */
1595         if (!mmc_host_is_spi(host)) {
1596                 err = mmc_select_card(card);
1597                 if (err)
1598                         goto free_card;
1599         }
1600
1601         if (!oldcard) {
1602                 /* Read extended CSD. */
1603                 err = mmc_read_ext_csd(card);
1604                 if (err)
1605                         goto free_card;
1606
1607                 /*
1608                  * If doing byte addressing, check if required to do sector
1609                  * addressing.  Handle the case of <2GB cards needing sector
1610                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1611                  * ocr register has bit 30 set for sector addressing.
1612                  */
1613                 if (rocr & BIT(30))
1614                         mmc_card_set_blockaddr(card);
1615
1616                 /* Erase size depends on CSD and Extended CSD */
1617                 mmc_set_erase_size(card);
1618         }
1619
1620         /*
1621          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1622          * bit.  This bit will be lost every time after a reset or power off.
1623          */
1624         if (card->ext_csd.partition_setting_completed ||
1625             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1626                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1627                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1628                                  card->ext_csd.generic_cmd6_time);
1629
1630                 if (err && err != -EBADMSG)
1631                         goto free_card;
1632
1633                 if (err) {
1634                         err = 0;
1635                         /*
1636                          * Just disable enhanced area off & sz
1637                          * will try to enable ERASE_GROUP_DEF
1638                          * during next time reinit
1639                          */
1640                         card->ext_csd.enhanced_area_offset = -EINVAL;
1641                         card->ext_csd.enhanced_area_size = -EINVAL;
1642                 } else {
1643                         card->ext_csd.erase_group_def = 1;
1644                         /*
1645                          * enable ERASE_GRP_DEF successfully.
1646                          * This will affect the erase size, so
1647                          * here need to reset erase size
1648                          */
1649                         mmc_set_erase_size(card);
1650                 }
1651         }
1652
1653         /*
1654          * Ensure eMMC user default partition is enabled
1655          */
1656         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1657                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1658                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1659                                  card->ext_csd.part_config,
1660                                  card->ext_csd.part_time);
1661                 if (err && err != -EBADMSG)
1662                         goto free_card;
1663         }
1664
1665         /*
1666          * Enable power_off_notification byte in the ext_csd register
1667          */
1668         if (card->ext_csd.rev >= 6) {
1669                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1670                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1671                                  EXT_CSD_POWER_ON,
1672                                  card->ext_csd.generic_cmd6_time);
1673                 if (err && err != -EBADMSG)
1674                         goto free_card;
1675
1676                 /*
1677                  * The err can be -EBADMSG or 0,
1678                  * so check for success and update the flag
1679                  */
1680                 if (!err)
1681                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1682         }
1683
1684         /*
1685          * Select timing interface
1686          */
1687         err = mmc_select_timing(card);
1688         if (err)
1689                 goto free_card;
1690
1691         if (mmc_card_hs200(card)) {
1692                 err = mmc_hs200_tuning(card);
1693                 if (err)
1694                         goto free_card;
1695
1696                 err = mmc_select_hs400(card);
1697                 if (err)
1698                         goto free_card;
1699         } else if (mmc_card_hs(card)) {
1700                 /* Select the desired bus width optionally */
1701                 err = mmc_select_bus_width(card);
1702                 if (err > 0) {
1703                         err = mmc_select_hs_ddr(card);
1704                         if (err)
1705                                 goto free_card;
1706                 }
1707         }
1708
1709         /*
1710          * Choose the power class with selected bus interface
1711          */
1712         mmc_select_powerclass(card);
1713
1714         /*
1715          * Enable HPI feature (if supported)
1716          */
1717         if (card->ext_csd.hpi) {
1718                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1719                                 EXT_CSD_HPI_MGMT, 1,
1720                                 card->ext_csd.generic_cmd6_time);
1721                 if (err && err != -EBADMSG)
1722                         goto free_card;
1723                 if (err) {
1724                         pr_warn("%s: Enabling HPI failed\n",
1725                                 mmc_hostname(card->host));
1726                         err = 0;
1727                 } else
1728                         card->ext_csd.hpi_en = 1;
1729         }
1730
1731         /*
1732          * If cache size is higher than 0, this indicates
1733          * the existence of cache and it can be turned on.
1734          */
1735         if (!mmc_card_broken_hpi(card) &&
1736             card->ext_csd.cache_size > 0) {
1737                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1738                                 EXT_CSD_CACHE_CTRL, 1,
1739                                 card->ext_csd.generic_cmd6_time);
1740                 if (err && err != -EBADMSG)
1741                         goto free_card;
1742
1743                 /*
1744                  * Only if no error, cache is turned on successfully.
1745                  */
1746                 if (err) {
1747                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1748                                 mmc_hostname(card->host), err);
1749                         card->ext_csd.cache_ctrl = 0;
1750                         err = 0;
1751                 } else {
1752                         card->ext_csd.cache_ctrl = 1;
1753                 }
1754         }
1755
1756         /*
1757          * The mandatory minimum values are defined for packed command.
1758          * read: 5, write: 3
1759          */
1760         if (card->ext_csd.max_packed_writes >= 3 &&
1761             card->ext_csd.max_packed_reads >= 5 &&
1762             host->caps2 & MMC_CAP2_PACKED_CMD) {
1763                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1764                                 EXT_CSD_EXP_EVENTS_CTRL,
1765                                 EXT_CSD_PACKED_EVENT_EN,
1766                                 card->ext_csd.generic_cmd6_time);
1767                 if (err && err != -EBADMSG)
1768                         goto free_card;
1769                 if (err) {
1770                         pr_warn("%s: Enabling packed event failed\n",
1771                                 mmc_hostname(card->host));
1772                         card->ext_csd.packed_event_en = 0;
1773                         err = 0;
1774                 } else {
1775                         card->ext_csd.packed_event_en = 1;
1776                 }
1777         }
1778
1779         if (!oldcard)
1780                 host->card = card;
1781
1782         return 0;
1783
1784 free_card:
1785         if (!oldcard)
1786                 mmc_remove_card(card);
1787 err:
1788         return err;
1789 }
1790
1791 static int mmc_can_sleep(struct mmc_card *card)
1792 {
1793         return (card && card->ext_csd.rev >= 3);
1794 }
1795
1796 static int mmc_sleep(struct mmc_host *host)
1797 {
1798         struct mmc_command cmd = {0};
1799         struct mmc_card *card = host->card;
1800         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1801         int err;
1802
1803         /* Re-tuning can't be done once the card is deselected */
1804         mmc_retune_hold(host);
1805
1806         err = mmc_deselect_cards(host);
1807         if (err)
1808                 goto out_release;
1809
1810         cmd.opcode = MMC_SLEEP_AWAKE;
1811         cmd.arg = card->rca << 16;
1812         cmd.arg |= 1 << 15;
1813
1814         /*
1815          * If the max_busy_timeout of the host is specified, validate it against
1816          * the sleep cmd timeout. A failure means we need to prevent the host
1817          * from doing hw busy detection, which is done by converting to a R1
1818          * response instead of a R1B.
1819          */
1820         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1821                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1822         } else {
1823                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1824                 cmd.busy_timeout = timeout_ms;
1825         }
1826
1827         err = mmc_wait_for_cmd(host, &cmd, 0);
1828         if (err)
1829                 goto out_release;
1830
1831         /*
1832          * If the host does not wait while the card signals busy, then we will
1833          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1834          * SEND_STATUS command to poll the status because that command (and most
1835          * others) is invalid while the card sleeps.
1836          */
1837         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1838                 mmc_delay(timeout_ms);
1839
1840 out_release:
1841         mmc_retune_release(host);
1842         return err;
1843 }
1844
1845 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1846 {
1847         return card &&
1848                 mmc_card_mmc(card) &&
1849                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1850 }
1851
1852 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1853 {
1854         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1855         int err;
1856
1857         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1858         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1859                 timeout = card->ext_csd.power_off_longtime;
1860
1861         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1862                         EXT_CSD_POWER_OFF_NOTIFICATION,
1863                         notify_type, timeout, 0, true, false, false);
1864         if (err)
1865                 pr_err("%s: Power Off Notification timed out, %u\n",
1866                        mmc_hostname(card->host), timeout);
1867
1868         /* Disable the power off notification after the switch operation. */
1869         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1870
1871         return err;
1872 }
1873
1874 /*
1875  * Host is being removed. Free up the current card.
1876  */
1877 static void mmc_remove(struct mmc_host *host)
1878 {
1879         BUG_ON(!host);
1880         BUG_ON(!host->card);
1881
1882         mmc_remove_card(host->card);
1883         host->card = NULL;
1884 }
1885
1886 /*
1887  * Card detection - card is alive.
1888  */
1889 static int mmc_alive(struct mmc_host *host)
1890 {
1891         return mmc_send_status(host->card, NULL);
1892 }
1893
1894 /*
1895  * Card detection callback from host.
1896  */
1897 static void mmc_detect(struct mmc_host *host)
1898 {
1899         int err;
1900
1901         BUG_ON(!host);
1902         BUG_ON(!host->card);
1903
1904         mmc_get_card(host->card);
1905
1906         /*
1907          * Just check if our card has been removed.
1908          */
1909         err = _mmc_detect_card_removed(host);
1910
1911         mmc_put_card(host->card);
1912
1913         if (err) {
1914                 mmc_remove(host);
1915
1916                 mmc_claim_host(host);
1917                 mmc_detach_bus(host);
1918                 mmc_power_off(host);
1919                 mmc_release_host(host);
1920         }
1921 }
1922
1923 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1924 {
1925         int err = 0;
1926         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1927                                         EXT_CSD_POWER_OFF_LONG;
1928
1929         BUG_ON(!host);
1930         BUG_ON(!host->card);
1931
1932         mmc_claim_host(host);
1933
1934         if (mmc_card_suspended(host->card))
1935                 goto out;
1936
1937         if (mmc_card_doing_bkops(host->card)) {
1938                 err = mmc_stop_bkops(host->card);
1939                 if (err)
1940                         goto out;
1941         }
1942
1943         err = mmc_flush_cache(host->card);
1944         if (err)
1945                 goto out;
1946
1947         if (mmc_can_poweroff_notify(host->card) &&
1948                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1949                 err = mmc_poweroff_notify(host->card, notify_type);
1950         else if (mmc_can_sleep(host->card))
1951                 err = mmc_sleep(host);
1952         else if (!mmc_host_is_spi(host))
1953                 err = mmc_deselect_cards(host);
1954
1955         if (!err) {
1956                 mmc_power_off(host);
1957                 mmc_card_set_suspended(host->card);
1958         }
1959 out:
1960         mmc_release_host(host);
1961         return err;
1962 }
1963
1964 /*
1965  * Suspend callback
1966  */
1967 static int mmc_suspend(struct mmc_host *host)
1968 {
1969         int err;
1970
1971         err = _mmc_suspend(host, true);
1972         if (!err) {
1973                 pm_runtime_disable(&host->card->dev);
1974                 pm_runtime_set_suspended(&host->card->dev);
1975         }
1976
1977         return err;
1978 }
1979
1980 /*
1981  * This function tries to determine if the same card is still present
1982  * and, if so, restore all state to it.
1983  */
1984 static int _mmc_resume(struct mmc_host *host)
1985 {
1986         int err = 0;
1987
1988         BUG_ON(!host);
1989         BUG_ON(!host->card);
1990
1991         mmc_claim_host(host);
1992
1993         if (!mmc_card_suspended(host->card))
1994                 goto out;
1995
1996         mmc_power_up(host, host->card->ocr);
1997         err = mmc_init_card(host, host->card->ocr, host->card);
1998         mmc_card_clr_suspended(host->card);
1999
2000 out:
2001         mmc_release_host(host);
2002         return err;
2003 }
2004
2005 /*
2006  * Shutdown callback
2007  */
2008 static int mmc_shutdown(struct mmc_host *host)
2009 {
2010         int err = 0;
2011
2012         /*
2013          * In a specific case for poweroff notify, we need to resume the card
2014          * before we can shutdown it properly.
2015          */
2016         if (mmc_can_poweroff_notify(host->card) &&
2017                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2018                 err = _mmc_resume(host);
2019
2020         if (!err)
2021                 err = _mmc_suspend(host, false);
2022
2023         return err;
2024 }
2025
2026 /*
2027  * Callback for resume.
2028  */
2029 static int mmc_resume(struct mmc_host *host)
2030 {
2031         pm_runtime_enable(&host->card->dev);
2032         return 0;
2033 }
2034
2035 /*
2036  * Callback for runtime_suspend.
2037  */
2038 static int mmc_runtime_suspend(struct mmc_host *host)
2039 {
2040         int err;
2041
2042         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2043                 return 0;
2044
2045         err = _mmc_suspend(host, true);
2046         if (err)
2047                 pr_err("%s: error %d doing aggressive suspend\n",
2048                         mmc_hostname(host), err);
2049
2050         return err;
2051 }
2052
2053 /*
2054  * Callback for runtime_resume.
2055  */
2056 static int mmc_runtime_resume(struct mmc_host *host)
2057 {
2058         int err;
2059
2060         err = _mmc_resume(host);
2061         if (err && err != -ENOMEDIUM)
2062                 pr_err("%s: error %d doing runtime resume\n",
2063                         mmc_hostname(host), err);
2064
2065         return 0;
2066 }
2067
2068 int mmc_can_reset(struct mmc_card *card)
2069 {
2070         u8 rst_n_function;
2071
2072         rst_n_function = card->ext_csd.rst_n_function;
2073         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2074                 return 0;
2075         return 1;
2076 }
2077 EXPORT_SYMBOL(mmc_can_reset);
2078
2079 static int mmc_reset(struct mmc_host *host)
2080 {
2081         struct mmc_card *card = host->card;
2082
2083         /*
2084          * In the case of recovery, we can't expect flushing the cache to work
2085          * always, but we have a go and ignore errors.
2086          */
2087         mmc_flush_cache(host->card);
2088
2089         if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
2090              mmc_can_reset(card)) {
2091                 /* If the card accept RST_n signal, send it. */
2092                 mmc_set_clock(host, host->f_init);
2093                 host->ops->hw_reset(host);
2094                 /* Set initial state and call mmc_set_ios */
2095                 mmc_set_initial_state(host);
2096         } else {
2097                 /* Do a brute force power cycle */
2098                 mmc_power_cycle(host, card->ocr);
2099         }
2100         return mmc_init_card(host, card->ocr, card);
2101 }
2102
2103 static const struct mmc_bus_ops mmc_ops = {
2104         .remove = mmc_remove,
2105         .detect = mmc_detect,
2106         .suspend = mmc_suspend,
2107         .resume = mmc_resume,
2108         .runtime_suspend = mmc_runtime_suspend,
2109         .runtime_resume = mmc_runtime_resume,
2110         .alive = mmc_alive,
2111         .shutdown = mmc_shutdown,
2112         .reset = mmc_reset,
2113 };
2114
2115 /*
2116  * Starting point for MMC card init.
2117  */
2118 int mmc_attach_mmc(struct mmc_host *host)
2119 {
2120         int err;
2121         u32 ocr, rocr;
2122
2123         BUG_ON(!host);
2124         WARN_ON(!host->claimed);
2125
2126         /* Set correct bus mode for MMC before attempting attach */
2127         if (!mmc_host_is_spi(host))
2128                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2129
2130         err = mmc_send_op_cond(host, 0, &ocr);
2131         if (err)
2132                 return err;
2133
2134         mmc_attach_bus(host, &mmc_ops);
2135         if (host->ocr_avail_mmc)
2136                 host->ocr_avail = host->ocr_avail_mmc;
2137
2138         /*
2139          * We need to get OCR a different way for SPI.
2140          */
2141         if (mmc_host_is_spi(host)) {
2142                 err = mmc_spi_read_ocr(host, 1, &ocr);
2143                 if (err)
2144                         goto err;
2145         }
2146
2147         rocr = mmc_select_voltage(host, ocr);
2148
2149         /*
2150          * Can we support the voltage of the card?
2151          */
2152         if (!rocr) {
2153                 err = -EINVAL;
2154                 goto err;
2155         }
2156
2157         /*
2158          * Detect and init the card.
2159          */
2160         err = mmc_init_card(host, rocr, NULL);
2161         if (err)
2162                 goto err;
2163
2164         mmc_release_host(host);
2165         err = mmc_add_card(host->card);
2166         if (err)
2167                 goto remove_card;
2168
2169         mmc_claim_host(host);
2170         return 0;
2171
2172 remove_card:
2173         mmc_remove_card(host->card);
2174         mmc_claim_host(host);
2175         host->card = NULL;
2176 err:
2177         mmc_detach_bus(host);
2178
2179         pr_err("%s: error %d whilst initialising MMC card\n",
2180                 mmc_hostname(host), err);
2181
2182         return err;
2183 }