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