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         return err;
1033 }
1034
1035 /*
1036  * Activate wide bus and DDR if supported.
1037  */
1038 static int mmc_select_hs_ddr(struct mmc_card *card)
1039 {
1040         struct mmc_host *host = card->host;
1041         u32 bus_width, ext_csd_bits;
1042         int err = 0;
1043
1044         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1045                 return 0;
1046
1047         bus_width = host->ios.bus_width;
1048         if (bus_width == MMC_BUS_WIDTH_1)
1049                 return 0;
1050
1051         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1052                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1053
1054         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1055                         EXT_CSD_BUS_WIDTH,
1056                         ext_csd_bits,
1057                         card->ext_csd.generic_cmd6_time);
1058         if (err) {
1059                 pr_err("%s: switch to bus width %d ddr failed\n",
1060                         mmc_hostname(host), 1 << bus_width);
1061                 return err;
1062         }
1063
1064         /*
1065          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1066          * signaling.
1067          *
1068          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1069          *
1070          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1071          * in the JEDEC spec for DDR.
1072          *
1073          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1074          * host controller can support this, like some of the SDHCI
1075          * controller which connect to an eMMC device. Some of these
1076          * host controller still needs to use 1.8v vccq for supporting
1077          * DDR mode.
1078          *
1079          * So the sequence will be:
1080          * if (host and device can both support 1.2v IO)
1081          *      use 1.2v IO;
1082          * else if (host and device can both support 1.8v IO)
1083          *      use 1.8v IO;
1084          * so if host and device can only support 3.3v IO, this is the
1085          * last choice.
1086          *
1087          * WARNING: eMMC rules are NOT the same as SD DDR
1088          */
1089         err = -EINVAL;
1090         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1091                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1092
1093         if (err && (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V))
1094                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1095
1096         /* make sure vccq is 3.3v after switching disaster */
1097         if (err)
1098                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1099
1100         if (!err)
1101                 mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1102
1103         return err;
1104 }
1105
1106 static int mmc_select_hs400(struct mmc_card *card)
1107 {
1108         struct mmc_host *host = card->host;
1109         unsigned int max_dtr;
1110         int err = 0;
1111         u8 val;
1112
1113         /*
1114          * HS400 mode requires 8-bit bus width
1115          */
1116         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1117               host->ios.bus_width == MMC_BUS_WIDTH_8))
1118                 return 0;
1119
1120         /* Switch card to HS mode */
1121         val = EXT_CSD_TIMING_HS;
1122         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1123                            EXT_CSD_HS_TIMING, val,
1124                            card->ext_csd.generic_cmd6_time,
1125                            true, false, true);
1126         if (err) {
1127                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1128                         mmc_hostname(host), err);
1129                 return err;
1130         }
1131
1132         /* Set host controller to HS timing */
1133         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1134
1135         /* Reduce frequency to HS frequency */
1136         max_dtr = card->ext_csd.hs_max_dtr;
1137         mmc_set_clock(host, max_dtr);
1138
1139         err = mmc_switch_status(card);
1140         if (err)
1141                 goto out_err;
1142
1143         /* Switch card to DDR */
1144         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1145                          EXT_CSD_BUS_WIDTH,
1146                          EXT_CSD_DDR_BUS_WIDTH_8,
1147                          card->ext_csd.generic_cmd6_time);
1148         if (err) {
1149                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1150                         mmc_hostname(host), err);
1151                 return err;
1152         }
1153
1154         /* Switch card to HS400 */
1155         val = EXT_CSD_TIMING_HS400 |
1156               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1157         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1158                            EXT_CSD_HS_TIMING, val,
1159                            card->ext_csd.generic_cmd6_time,
1160                            true, false, true);
1161         if (err) {
1162                 pr_err("%s: switch to hs400 failed, err:%d\n",
1163                          mmc_hostname(host), err);
1164                 return err;
1165         }
1166
1167         /* Set host controller to HS400 timing and frequency */
1168         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1169         mmc_set_bus_speed(card);
1170
1171         err = mmc_switch_status(card);
1172         if (err)
1173                 goto out_err;
1174
1175         return 0;
1176
1177 out_err:
1178         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1179                __func__, err);
1180         return err;
1181 }
1182
1183 int mmc_hs200_to_hs400(struct mmc_card *card)
1184 {
1185         return mmc_select_hs400(card);
1186 }
1187
1188 int mmc_hs400_to_hs200(struct mmc_card *card)
1189 {
1190         struct mmc_host *host = card->host;
1191         unsigned int max_dtr;
1192         int err;
1193         u8 val;
1194
1195         /* Reduce frequency to HS */
1196         max_dtr = card->ext_csd.hs_max_dtr;
1197         mmc_set_clock(host, max_dtr);
1198
1199         /* Switch HS400 to HS DDR */
1200         val = EXT_CSD_TIMING_HS;
1201         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1202                            val, card->ext_csd.generic_cmd6_time,
1203                            true, false, true);
1204         if (err)
1205                 goto out_err;
1206
1207         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1208
1209         err = mmc_switch_status(card);
1210         if (err)
1211                 goto out_err;
1212
1213         /* Switch HS DDR to HS */
1214         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1215                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1216                            true, false, true);
1217         if (err)
1218                 goto out_err;
1219
1220         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1221
1222         err = mmc_switch_status(card);
1223         if (err)
1224                 goto out_err;
1225
1226         /* Switch HS to HS200 */
1227         val = EXT_CSD_TIMING_HS200 |
1228               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1229         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1230                            val, card->ext_csd.generic_cmd6_time,
1231                            true, false, true);
1232         if (err)
1233                 goto out_err;
1234
1235         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1236
1237         err = mmc_switch_status(card);
1238         if (err)
1239                 goto out_err;
1240
1241         mmc_set_bus_speed(card);
1242
1243         return 0;
1244
1245 out_err:
1246         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1247                __func__, err);
1248         return err;
1249 }
1250
1251 static int mmc_select_hs400es(struct mmc_card *card)
1252 {
1253         struct mmc_host *host = card->host;
1254         int err = 0;
1255         u8 val;
1256
1257         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1258                 err = -ENOTSUPP;
1259                 goto out_err;
1260         }
1261
1262         err = mmc_select_bus_width(card);
1263         if (err < 0)
1264                 goto out_err;
1265
1266         /* Switch card to HS mode */
1267         err = mmc_select_hs(card);
1268         if (err) {
1269                 pr_err("%s: switch to high-speed failed, err:%d\n",
1270                         mmc_hostname(host), err);
1271                 goto out_err;
1272         }
1273
1274         err = mmc_switch_status(card);
1275         if (err)
1276                 goto out_err;
1277
1278         /* Switch card to DDR with strobe bit */
1279         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1280         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1281                          EXT_CSD_BUS_WIDTH,
1282                          val,
1283                          card->ext_csd.generic_cmd6_time);
1284         if (err) {
1285                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1286                         mmc_hostname(host), err);
1287                 goto out_err;
1288         }
1289
1290         /* Switch card to HS400 */
1291         val = EXT_CSD_TIMING_HS400 |
1292               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1293         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1294                            EXT_CSD_HS_TIMING, val,
1295                            card->ext_csd.generic_cmd6_time,
1296                            true, false, true);
1297         if (err) {
1298                 pr_err("%s: switch to hs400es failed, err:%d\n",
1299                         mmc_hostname(host), err);
1300                 goto out_err;
1301         }
1302
1303         /* Set host controller to HS400 timing and frequency */
1304         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1305
1306         /* Controller enable enhanced strobe function */
1307         host->ios.enhanced_strobe = true;
1308         if (host->ops->hs400_enhanced_strobe)
1309                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1310
1311         err = mmc_switch_status(card);
1312         if (err)
1313                 goto out_err;
1314
1315         return 0;
1316
1317 out_err:
1318         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1319                __func__, err);
1320         return err;
1321 }
1322
1323 static void mmc_select_driver_type(struct mmc_card *card)
1324 {
1325         int card_drv_type, drive_strength, drv_type;
1326
1327         card_drv_type = card->ext_csd.raw_driver_strength |
1328                         mmc_driver_type_mask(0);
1329
1330         drive_strength = mmc_select_drive_strength(card,
1331                                                    card->ext_csd.hs200_max_dtr,
1332                                                    card_drv_type, &drv_type);
1333
1334         card->drive_strength = drive_strength;
1335
1336         if (drv_type)
1337                 mmc_set_driver_type(card->host, drv_type);
1338 }
1339
1340 /*
1341  * For device supporting HS200 mode, the following sequence
1342  * should be done before executing the tuning process.
1343  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1344  * 2. switch to HS200 mode
1345  * 3. set the clock to > 52Mhz and <=200MHz
1346  */
1347 static int mmc_select_hs200(struct mmc_card *card)
1348 {
1349         struct mmc_host *host = card->host;
1350         unsigned int old_timing, old_signal_voltage;
1351         int err = -EINVAL;
1352         u8 val;
1353
1354         old_signal_voltage = host->ios.signal_voltage;
1355         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1356                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1357
1358         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1359                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1360
1361         /* If fails try again during next card power cycle */
1362         if (err)
1363                 return err;
1364
1365         mmc_select_driver_type(card);
1366
1367         /*
1368          * Set the bus width(4 or 8) with host's support and
1369          * switch to HS200 mode if bus width is set successfully.
1370          */
1371         err = mmc_select_bus_width(card);
1372         if (err > 0) {
1373                 val = EXT_CSD_TIMING_HS200 |
1374                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1375                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1376                                    EXT_CSD_HS_TIMING, val,
1377                                    card->ext_csd.generic_cmd6_time,
1378                                    true, false, true);
1379                 if (err)
1380                         goto err;
1381                 old_timing = host->ios.timing;
1382                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1383
1384                 err = mmc_switch_status(card);
1385                 /*
1386                  * mmc_select_timing() assumes timing has not changed if
1387                  * it is a switch error.
1388                  */
1389                 if (err == -EBADMSG)
1390                         mmc_set_timing(host, old_timing);
1391         }
1392 err:
1393         if (err) {
1394                 /* fall back to the old signal voltage, if fails report error */
1395                 if (__mmc_set_signal_voltage(host, old_signal_voltage))
1396                         err = -EIO;
1397
1398                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1399                        __func__, err);
1400         }
1401         return err;
1402 }
1403
1404 /*
1405  * Activate High Speed, HS200 or HS400ES mode if supported.
1406  */
1407 static int mmc_select_timing(struct mmc_card *card)
1408 {
1409         int err = 0;
1410
1411         if (!mmc_can_ext_csd(card))
1412                 goto bus_speed;
1413
1414         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1415                 err = mmc_select_hs400es(card);
1416         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1417                 err = mmc_select_hs200(card);
1418         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1419                 err = mmc_select_hs(card);
1420
1421         if (err && err != -EBADMSG)
1422                 return err;
1423
1424 bus_speed:
1425         /*
1426          * Set the bus speed to the selected bus timing.
1427          * If timing is not selected, backward compatible is the default.
1428          */
1429         mmc_set_bus_speed(card);
1430         return 0;
1431 }
1432
1433 /*
1434  * Execute tuning sequence to seek the proper bus operating
1435  * conditions for HS200 and HS400, which sends CMD21 to the device.
1436  */
1437 static int mmc_hs200_tuning(struct mmc_card *card)
1438 {
1439         struct mmc_host *host = card->host;
1440
1441         /*
1442          * Timing should be adjusted to the HS400 target
1443          * operation frequency for tuning process
1444          */
1445         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1446             host->ios.bus_width == MMC_BUS_WIDTH_8)
1447                 if (host->ops->prepare_hs400_tuning)
1448                         host->ops->prepare_hs400_tuning(host, &host->ios);
1449
1450         return mmc_execute_tuning(card);
1451 }
1452
1453 /*
1454  * Handle the detection and initialisation of a card.
1455  *
1456  * In the case of a resume, "oldcard" will contain the card
1457  * we're trying to reinitialise.
1458  */
1459 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1460         struct mmc_card *oldcard)
1461 {
1462         struct mmc_card *card;
1463         int err;
1464         u32 cid[4];
1465         u32 rocr;
1466
1467         BUG_ON(!host);
1468         WARN_ON(!host->claimed);
1469
1470         /* Set correct bus mode for MMC before attempting init */
1471         if (!mmc_host_is_spi(host))
1472                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1473
1474         /*
1475          * Since we're changing the OCR value, we seem to
1476          * need to tell some cards to go back to the idle
1477          * state.  We wait 1ms to give cards time to
1478          * respond.
1479          * mmc_go_idle is needed for eMMC that are asleep
1480          */
1481         mmc_go_idle(host);
1482
1483         /* The extra bit indicates that we support high capacity */
1484         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1485         if (err)
1486                 goto err;
1487
1488         /*
1489          * For SPI, enable CRC as appropriate.
1490          */
1491         if (mmc_host_is_spi(host)) {
1492                 err = mmc_spi_set_crc(host, use_spi_crc);
1493                 if (err)
1494                         goto err;
1495         }
1496
1497         /*
1498          * Fetch CID from card.
1499          */
1500         if (mmc_host_is_spi(host))
1501                 err = mmc_send_cid(host, cid);
1502         else
1503                 err = mmc_all_send_cid(host, cid);
1504         if (err)
1505                 goto err;
1506
1507         if (oldcard) {
1508                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1509                         err = -ENOENT;
1510                         goto err;
1511                 }
1512
1513                 card = oldcard;
1514         } else {
1515                 /*
1516                  * Allocate card structure.
1517                  */
1518                 card = mmc_alloc_card(host, &mmc_type);
1519                 if (IS_ERR(card)) {
1520                         err = PTR_ERR(card);
1521                         goto err;
1522                 }
1523
1524                 card->ocr = ocr;
1525                 card->type = MMC_TYPE_MMC;
1526                 card->rca = 1;
1527                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1528         }
1529
1530         /*
1531          * Call the optional HC's init_card function to handle quirks.
1532          */
1533         if (host->ops->init_card)
1534                 host->ops->init_card(host, card);
1535
1536         /*
1537          * For native busses:  set card RCA and quit open drain mode.
1538          */
1539         if (!mmc_host_is_spi(host)) {
1540                 err = mmc_set_relative_addr(card);
1541                 if (err)
1542                         goto free_card;
1543
1544                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1545         }
1546
1547         if (!oldcard) {
1548                 /*
1549                  * Fetch CSD from card.
1550                  */
1551                 err = mmc_send_csd(card, card->raw_csd);
1552                 if (err)
1553                         goto free_card;
1554
1555                 err = mmc_decode_csd(card);
1556                 if (err)
1557                         goto free_card;
1558                 err = mmc_decode_cid(card);
1559                 if (err)
1560                         goto free_card;
1561         }
1562
1563         /*
1564          * handling only for cards supporting DSR and hosts requesting
1565          * DSR configuration
1566          */
1567         if (card->csd.dsr_imp && host->dsr_req)
1568                 mmc_set_dsr(host);
1569
1570         /*
1571          * Select card, as all following commands rely on that.
1572          */
1573         if (!mmc_host_is_spi(host)) {
1574                 err = mmc_select_card(card);
1575                 if (err)
1576                         goto free_card;
1577         }
1578
1579         if (!oldcard) {
1580                 /* Read extended CSD. */
1581                 err = mmc_read_ext_csd(card);
1582                 if (err)
1583                         goto free_card;
1584
1585                 /*
1586                  * If doing byte addressing, check if required to do sector
1587                  * addressing.  Handle the case of <2GB cards needing sector
1588                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1589                  * ocr register has bit 30 set for sector addressing.
1590                  */
1591                 if (rocr & BIT(30))
1592                         mmc_card_set_blockaddr(card);
1593
1594                 /* Erase size depends on CSD and Extended CSD */
1595                 mmc_set_erase_size(card);
1596         }
1597
1598         /*
1599          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1600          * bit.  This bit will be lost every time after a reset or power off.
1601          */
1602         if (card->ext_csd.partition_setting_completed ||
1603             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1604                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1605                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1606                                  card->ext_csd.generic_cmd6_time);
1607
1608                 if (err && err != -EBADMSG)
1609                         goto free_card;
1610
1611                 if (err) {
1612                         err = 0;
1613                         /*
1614                          * Just disable enhanced area off & sz
1615                          * will try to enable ERASE_GROUP_DEF
1616                          * during next time reinit
1617                          */
1618                         card->ext_csd.enhanced_area_offset = -EINVAL;
1619                         card->ext_csd.enhanced_area_size = -EINVAL;
1620                 } else {
1621                         card->ext_csd.erase_group_def = 1;
1622                         /*
1623                          * enable ERASE_GRP_DEF successfully.
1624                          * This will affect the erase size, so
1625                          * here need to reset erase size
1626                          */
1627                         mmc_set_erase_size(card);
1628                 }
1629         }
1630
1631         /*
1632          * Ensure eMMC user default partition is enabled
1633          */
1634         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1635                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1636                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1637                                  card->ext_csd.part_config,
1638                                  card->ext_csd.part_time);
1639                 if (err && err != -EBADMSG)
1640                         goto free_card;
1641         }
1642
1643         /*
1644          * Enable power_off_notification byte in the ext_csd register
1645          */
1646         if (card->ext_csd.rev >= 6) {
1647                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1648                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1649                                  EXT_CSD_POWER_ON,
1650                                  card->ext_csd.generic_cmd6_time);
1651                 if (err && err != -EBADMSG)
1652                         goto free_card;
1653
1654                 /*
1655                  * The err can be -EBADMSG or 0,
1656                  * so check for success and update the flag
1657                  */
1658                 if (!err)
1659                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1660         }
1661
1662         /*
1663          * Select timing interface
1664          */
1665         err = mmc_select_timing(card);
1666         if (err)
1667                 goto free_card;
1668
1669         if (mmc_card_hs200(card)) {
1670                 err = mmc_hs200_tuning(card);
1671                 if (err)
1672                         goto free_card;
1673
1674                 err = mmc_select_hs400(card);
1675                 if (err)
1676                         goto free_card;
1677         } else if (mmc_card_hs(card)) {
1678                 /* Select the desired bus width optionally */
1679                 err = mmc_select_bus_width(card);
1680                 if (err > 0) {
1681                         err = mmc_select_hs_ddr(card);
1682                         if (err)
1683                                 goto free_card;
1684                 }
1685         }
1686
1687         /*
1688          * Choose the power class with selected bus interface
1689          */
1690         mmc_select_powerclass(card);
1691
1692         /*
1693          * Enable HPI feature (if supported)
1694          */
1695         if (card->ext_csd.hpi) {
1696                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1697                                 EXT_CSD_HPI_MGMT, 1,
1698                                 card->ext_csd.generic_cmd6_time);
1699                 if (err && err != -EBADMSG)
1700                         goto free_card;
1701                 if (err) {
1702                         pr_warn("%s: Enabling HPI failed\n",
1703                                 mmc_hostname(card->host));
1704                         err = 0;
1705                 } else
1706                         card->ext_csd.hpi_en = 1;
1707         }
1708
1709         /*
1710          * If cache size is higher than 0, this indicates
1711          * the existence of cache and it can be turned on.
1712          */
1713         if (!mmc_card_broken_hpi(card) &&
1714             card->ext_csd.cache_size > 0) {
1715                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1716                                 EXT_CSD_CACHE_CTRL, 1,
1717                                 card->ext_csd.generic_cmd6_time);
1718                 if (err && err != -EBADMSG)
1719                         goto free_card;
1720
1721                 /*
1722                  * Only if no error, cache is turned on successfully.
1723                  */
1724                 if (err) {
1725                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1726                                 mmc_hostname(card->host), err);
1727                         card->ext_csd.cache_ctrl = 0;
1728                         err = 0;
1729                 } else {
1730                         card->ext_csd.cache_ctrl = 1;
1731                 }
1732         }
1733
1734         /*
1735          * The mandatory minimum values are defined for packed command.
1736          * read: 5, write: 3
1737          */
1738         if (card->ext_csd.max_packed_writes >= 3 &&
1739             card->ext_csd.max_packed_reads >= 5 &&
1740             host->caps2 & MMC_CAP2_PACKED_CMD) {
1741                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1742                                 EXT_CSD_EXP_EVENTS_CTRL,
1743                                 EXT_CSD_PACKED_EVENT_EN,
1744                                 card->ext_csd.generic_cmd6_time);
1745                 if (err && err != -EBADMSG)
1746                         goto free_card;
1747                 if (err) {
1748                         pr_warn("%s: Enabling packed event failed\n",
1749                                 mmc_hostname(card->host));
1750                         card->ext_csd.packed_event_en = 0;
1751                         err = 0;
1752                 } else {
1753                         card->ext_csd.packed_event_en = 1;
1754                 }
1755         }
1756
1757         if (!oldcard)
1758                 host->card = card;
1759
1760         return 0;
1761
1762 free_card:
1763         if (!oldcard)
1764                 mmc_remove_card(card);
1765 err:
1766         return err;
1767 }
1768
1769 static int mmc_can_sleep(struct mmc_card *card)
1770 {
1771         return (card && card->ext_csd.rev >= 3);
1772 }
1773
1774 static int mmc_sleep(struct mmc_host *host)
1775 {
1776         struct mmc_command cmd = {0};
1777         struct mmc_card *card = host->card;
1778         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1779         int err;
1780
1781         /* Re-tuning can't be done once the card is deselected */
1782         mmc_retune_hold(host);
1783
1784         err = mmc_deselect_cards(host);
1785         if (err)
1786                 goto out_release;
1787
1788         cmd.opcode = MMC_SLEEP_AWAKE;
1789         cmd.arg = card->rca << 16;
1790         cmd.arg |= 1 << 15;
1791
1792         /*
1793          * If the max_busy_timeout of the host is specified, validate it against
1794          * the sleep cmd timeout. A failure means we need to prevent the host
1795          * from doing hw busy detection, which is done by converting to a R1
1796          * response instead of a R1B.
1797          */
1798         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1799                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1800         } else {
1801                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1802                 cmd.busy_timeout = timeout_ms;
1803         }
1804
1805         err = mmc_wait_for_cmd(host, &cmd, 0);
1806         if (err)
1807                 goto out_release;
1808
1809         /*
1810          * If the host does not wait while the card signals busy, then we will
1811          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1812          * SEND_STATUS command to poll the status because that command (and most
1813          * others) is invalid while the card sleeps.
1814          */
1815         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1816                 mmc_delay(timeout_ms);
1817
1818 out_release:
1819         mmc_retune_release(host);
1820         return err;
1821 }
1822
1823 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1824 {
1825         return card &&
1826                 mmc_card_mmc(card) &&
1827                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1828 }
1829
1830 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1831 {
1832         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1833         int err;
1834
1835         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1836         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1837                 timeout = card->ext_csd.power_off_longtime;
1838
1839         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1840                         EXT_CSD_POWER_OFF_NOTIFICATION,
1841                         notify_type, timeout, true, false, false);
1842         if (err)
1843                 pr_err("%s: Power Off Notification timed out, %u\n",
1844                        mmc_hostname(card->host), timeout);
1845
1846         /* Disable the power off notification after the switch operation. */
1847         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1848
1849         return err;
1850 }
1851
1852 /*
1853  * Host is being removed. Free up the current card.
1854  */
1855 static void mmc_remove(struct mmc_host *host)
1856 {
1857         BUG_ON(!host);
1858         BUG_ON(!host->card);
1859
1860         mmc_remove_card(host->card);
1861         host->card = NULL;
1862 }
1863
1864 /*
1865  * Card detection - card is alive.
1866  */
1867 static int mmc_alive(struct mmc_host *host)
1868 {
1869         return mmc_send_status(host->card, NULL);
1870 }
1871
1872 /*
1873  * Card detection callback from host.
1874  */
1875 static void mmc_detect(struct mmc_host *host)
1876 {
1877         int err;
1878
1879         BUG_ON(!host);
1880         BUG_ON(!host->card);
1881
1882         mmc_get_card(host->card);
1883
1884         /*
1885          * Just check if our card has been removed.
1886          */
1887         err = _mmc_detect_card_removed(host);
1888
1889         mmc_put_card(host->card);
1890
1891         if (err) {
1892                 mmc_remove(host);
1893
1894                 mmc_claim_host(host);
1895                 mmc_detach_bus(host);
1896                 mmc_power_off(host);
1897                 mmc_release_host(host);
1898         }
1899 }
1900
1901 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1902 {
1903         int err = 0;
1904         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1905                                         EXT_CSD_POWER_OFF_LONG;
1906
1907         BUG_ON(!host);
1908         BUG_ON(!host->card);
1909
1910         mmc_claim_host(host);
1911
1912         if (mmc_card_suspended(host->card))
1913                 goto out;
1914
1915         if (mmc_card_doing_bkops(host->card)) {
1916                 err = mmc_stop_bkops(host->card);
1917                 if (err)
1918                         goto out;
1919         }
1920
1921         err = mmc_flush_cache(host->card);
1922         if (err)
1923                 goto out;
1924
1925         if (mmc_can_poweroff_notify(host->card) &&
1926                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1927                 err = mmc_poweroff_notify(host->card, notify_type);
1928         else if (mmc_can_sleep(host->card))
1929                 err = mmc_sleep(host);
1930         else if (!mmc_host_is_spi(host))
1931                 err = mmc_deselect_cards(host);
1932
1933         if (!err) {
1934                 mmc_power_off(host);
1935                 mmc_card_set_suspended(host->card);
1936         }
1937 out:
1938         mmc_release_host(host);
1939         return err;
1940 }
1941
1942 /*
1943  * Suspend callback
1944  */
1945 static int mmc_suspend(struct mmc_host *host)
1946 {
1947         int err;
1948
1949         err = _mmc_suspend(host, true);
1950         if (!err) {
1951                 pm_runtime_disable(&host->card->dev);
1952                 pm_runtime_set_suspended(&host->card->dev);
1953         }
1954
1955         return err;
1956 }
1957
1958 /*
1959  * This function tries to determine if the same card is still present
1960  * and, if so, restore all state to it.
1961  */
1962 static int _mmc_resume(struct mmc_host *host)
1963 {
1964         int err = 0;
1965
1966         BUG_ON(!host);
1967         BUG_ON(!host->card);
1968
1969         mmc_claim_host(host);
1970
1971         if (!mmc_card_suspended(host->card))
1972                 goto out;
1973
1974         mmc_power_up(host, host->card->ocr);
1975         err = mmc_init_card(host, host->card->ocr, host->card);
1976         mmc_card_clr_suspended(host->card);
1977
1978 out:
1979         mmc_release_host(host);
1980         return err;
1981 }
1982
1983 /*
1984  * Shutdown callback
1985  */
1986 static int mmc_shutdown(struct mmc_host *host)
1987 {
1988         int err = 0;
1989
1990         /*
1991          * In a specific case for poweroff notify, we need to resume the card
1992          * before we can shutdown it properly.
1993          */
1994         if (mmc_can_poweroff_notify(host->card) &&
1995                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
1996                 err = _mmc_resume(host);
1997
1998         if (!err)
1999                 err = _mmc_suspend(host, false);
2000
2001         return err;
2002 }
2003
2004 /*
2005  * Callback for resume.
2006  */
2007 static int mmc_resume(struct mmc_host *host)
2008 {
2009         pm_runtime_enable(&host->card->dev);
2010         return 0;
2011 }
2012
2013 /*
2014  * Callback for runtime_suspend.
2015  */
2016 static int mmc_runtime_suspend(struct mmc_host *host)
2017 {
2018         int err;
2019
2020         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2021                 return 0;
2022
2023         err = _mmc_suspend(host, true);
2024         if (err)
2025                 pr_err("%s: error %d doing aggressive suspend\n",
2026                         mmc_hostname(host), err);
2027
2028         return err;
2029 }
2030
2031 /*
2032  * Callback for runtime_resume.
2033  */
2034 static int mmc_runtime_resume(struct mmc_host *host)
2035 {
2036         int err;
2037
2038         err = _mmc_resume(host);
2039         if (err && err != -ENOMEDIUM)
2040                 pr_err("%s: error %d doing runtime resume\n",
2041                         mmc_hostname(host), err);
2042
2043         return 0;
2044 }
2045
2046 int mmc_can_reset(struct mmc_card *card)
2047 {
2048         u8 rst_n_function;
2049
2050         rst_n_function = card->ext_csd.rst_n_function;
2051         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2052                 return 0;
2053         return 1;
2054 }
2055 EXPORT_SYMBOL(mmc_can_reset);
2056
2057 static int mmc_reset(struct mmc_host *host)
2058 {
2059         struct mmc_card *card = host->card;
2060
2061         /*
2062          * In the case of recovery, we can't expect flushing the cache to work
2063          * always, but we have a go and ignore errors.
2064          */
2065         mmc_flush_cache(host->card);
2066
2067         if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
2068              mmc_can_reset(card)) {
2069                 /* If the card accept RST_n signal, send it. */
2070                 mmc_set_clock(host, host->f_init);
2071                 host->ops->hw_reset(host);
2072                 /* Set initial state and call mmc_set_ios */
2073                 mmc_set_initial_state(host);
2074         } else {
2075                 /* Do a brute force power cycle */
2076                 mmc_power_cycle(host, card->ocr);
2077         }
2078         return mmc_init_card(host, card->ocr, card);
2079 }
2080
2081 static const struct mmc_bus_ops mmc_ops = {
2082         .remove = mmc_remove,
2083         .detect = mmc_detect,
2084         .suspend = mmc_suspend,
2085         .resume = mmc_resume,
2086         .runtime_suspend = mmc_runtime_suspend,
2087         .runtime_resume = mmc_runtime_resume,
2088         .alive = mmc_alive,
2089         .shutdown = mmc_shutdown,
2090         .reset = mmc_reset,
2091 };
2092
2093 /*
2094  * Starting point for MMC card init.
2095  */
2096 int mmc_attach_mmc(struct mmc_host *host)
2097 {
2098         int err;
2099         u32 ocr, rocr;
2100
2101         BUG_ON(!host);
2102         WARN_ON(!host->claimed);
2103
2104         /* Set correct bus mode for MMC before attempting attach */
2105         if (!mmc_host_is_spi(host))
2106                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2107
2108         err = mmc_send_op_cond(host, 0, &ocr);
2109         if (err)
2110                 return err;
2111
2112         mmc_attach_bus(host, &mmc_ops);
2113         if (host->ocr_avail_mmc)
2114                 host->ocr_avail = host->ocr_avail_mmc;
2115
2116         /*
2117          * We need to get OCR a different way for SPI.
2118          */
2119         if (mmc_host_is_spi(host)) {
2120                 err = mmc_spi_read_ocr(host, 1, &ocr);
2121                 if (err)
2122                         goto err;
2123         }
2124
2125         rocr = mmc_select_voltage(host, ocr);
2126
2127         /*
2128          * Can we support the voltage of the card?
2129          */
2130         if (!rocr) {
2131                 err = -EINVAL;
2132                 goto err;
2133         }
2134
2135         /*
2136          * Detect and init the card.
2137          */
2138         err = mmc_init_card(host, rocr, NULL);
2139         if (err)
2140                 goto err;
2141
2142         mmc_release_host(host);
2143         err = mmc_add_card(host->card);
2144         if (err)
2145                 goto remove_card;
2146
2147         mmc_claim_host(host);
2148         return 0;
2149
2150 remove_card:
2151         mmc_remove_card(host->card);
2152         mmc_claim_host(host);
2153         host->card = NULL;
2154 err:
2155         mmc_detach_bus(host);
2156
2157         pr_err("%s: error %d whilst initialising MMC card\n",
2158                 mmc_hostname(host), err);
2159
2160         return err;
2161 }