drivers/mmc/core/mmc.c

   1 /*
   2  *  linux/drivers/mmc/core/mmc.c
   3  *
   4  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   5  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   6  *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/of.h>
  15 #include <linux/slab.h>
  16 #include <linux/stat.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <linux/mmc/host.h>
  20 #include <linux/mmc/card.h>
  21 #include <linux/mmc/mmc.h>
  22
  23 #include "core.h"
  24 #include "host.h"
  25 #include "bus.h"
  26 #include "mmc_ops.h"
  27 #include "sd_ops.h"
  28
  29 #define DEFAULT_CMD6_TIMEOUT_MS 500
  30 #define MIN_CACHE_EN_TIMEOUT_MS 1600
  31
  32 static const unsigned int tran_exp[] = {
  33         10000,          100000,         1000000,        10000000,
  34         0,              0,              0,              0
  35 };
  36
  37 static const unsigned char tran_mant[] = {
  38         0,      10,     12,     13,     15,     20,     25,     30,
  39         35,     40,     45,     50,     55,     60,     70,     80,
  40 };
  41
  42 static const unsigned int tacc_exp[] = {
  43         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  44 };
  45
  46 static const unsigned int tacc_mant[] = {
  47         0,      10,     12,     13,     15,     20,     25,     30,
  48         35,     40,     45,     50,     55,     60,     70,     80,
  49 };
  50
  51 static const struct mmc_fixup mmc_ext_csd_fixups[] = {
  52         /*
  53          * Certain Hynix eMMC 4.41 cards might get broken when HPI feature
  54          * is used so disable the HPI feature for such buggy cards.
  55          */
  56         MMC_FIXUP_EXT_CSD_REV(CID_NAME_ANY, CID_MANFID_HYNIX,
  57                               0x014a, add_quirk, MMC_QUIRK_BROKEN_HPI, 5),
  58
  59         END_FIXUP
  60 };
  61
  62 #define UNSTUFF_BITS(resp,start,size)                                   \
  63         ({                                                              \
  64                 const int __size = size;                                \
  65                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  66                 const int __off = 3 - ((start) / 32);                   \
  67                 const int __shft = (start) & 31;                        \
  68                 u32 __res;                                              \
  69                                                                         \
  70                 __res = resp[__off] >> __shft;                          \
  71                 if (__size + __shft > 32)                               \
  72                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  73                 __res & __mask;                                         \
  74         })
  75
  76 /*
  77  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  78  */
  79 static int mmc_decode_cid(struct mmc_card *card)
  80 {
  81         u32 *resp = card->raw_cid;
  82
  83         /*
  84          * The selection of the format here is based upon published
  85          * specs from sandisk and from what people have reported.
  86          */
  87         switch (card->csd.mmca_vsn) {
  88         case 0: /* MMC v1.0 - v1.2 */
  89         case 1: /* MMC v1.4 */
  90                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  91                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  92                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  93                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  94                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  95                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  96                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  97                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  98                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  99                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
 100                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
 101                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 102                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 103                 break;
 104
 105         case 2: /* MMC v2.0 - v2.2 */
 106         case 3: /* MMC v3.1 - v3.3 */
 107         case 4: /* MMC v4 */
 108                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
 109                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
 110                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
 111                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
 112                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
 113                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
 114                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
 115                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 116                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 117                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 118                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 119                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 120                 break;
 121
 122         default:
 123                 pr_err("%s: card has unknown MMCA version %d\n",
 124                         mmc_hostname(card->host), card->csd.mmca_vsn);
 125                 return -EINVAL;
 126         }
 127
 128         return 0;
 129 }
 130
 131 static void mmc_set_erase_size(struct mmc_card *card)
 132 {
 133         if (card->ext_csd.erase_group_def & 1)
 134                 card->erase_size = card->ext_csd.hc_erase_size;
 135         else
 136                 card->erase_size = card->csd.erase_size;
 137
 138         mmc_init_erase(card);
 139 }
 140
 141 /*
 142  * Given a 128-bit response, decode to our card CSD structure.
 143  */
 144 static int mmc_decode_csd(struct mmc_card *card)
 145 {
 146         struct mmc_csd *csd = &card->csd;
 147         unsigned int e, m, a, b;
 148         u32 *resp = card->raw_csd;
 149
 150         /*
 151          * We only understand CSD structure v1.1 and v1.2.
 152          * v1.2 has extra information in bits 15, 11 and 10.
 153          * We also support eMMC v4.4 & v4.41.
 154          */
 155         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 156         if (csd->structure == 0) {
 157                 pr_err("%s: unrecognised CSD structure version %d\n",
 158                         mmc_hostname(card->host), csd->structure);
 159                 return -EINVAL;
 160         }
 161
 162         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 163         m = UNSTUFF_BITS(resp, 115, 4);
 164         e = UNSTUFF_BITS(resp, 112, 3);
 165         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 166         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 167
 168         m = UNSTUFF_BITS(resp, 99, 4);
 169         e = UNSTUFF_BITS(resp, 96, 3);
 170         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 171         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 172
 173         e = UNSTUFF_BITS(resp, 47, 3);
 174         m = UNSTUFF_BITS(resp, 62, 12);
 175         csd->capacity     = (1 + m) << (e + 2);
 176
 177         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 178         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 179         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 180         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 181         csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 182         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 183         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 184         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 185
 186         if (csd->write_blkbits >= 9) {
 187                 a = UNSTUFF_BITS(resp, 42, 5);
 188                 b = UNSTUFF_BITS(resp, 37, 5);
 189                 csd->erase_size = (a + 1) * (b + 1);
 190                 csd->erase_size <<= csd->write_blkbits - 9;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static void mmc_select_card_type(struct mmc_card *card)
 197 {
 198         struct mmc_host *host = card->host;
 199         u8 card_type = card->ext_csd.raw_card_type;
 200         u32 caps = host->caps, caps2 = host->caps2;
 201         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 202         unsigned int avail_type = 0;
 203
 204         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 205             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 206                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 207                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 208         }
 209
 210         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 211             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 212                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 213                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 214         }
 215
 216         if (caps & MMC_CAP_1_8V_DDR &&
 217             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 218                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 219                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 220         }
 221
 222         if (caps & MMC_CAP_1_2V_DDR &&
 223             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 224                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 225                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 226         }
 227
 228         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 229             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 230                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 231                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 232         }
 233
 234         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 235             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 236                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 237                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 238         }
 239
 240         if (caps2 & MMC_CAP2_HS400_1_8V &&
 241             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 242                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 243                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 244         }
 245
 246         if (caps2 & MMC_CAP2_HS400_1_2V &&
 247             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 248                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 249                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 250         }
 251
 252         if ((caps2 & MMC_CAP2_HS400_ES) &&
 253             card->ext_csd.strobe_support &&
 254             (avail_type & EXT_CSD_CARD_TYPE_HS400))
 255                 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
 256
 257         card->ext_csd.hs_max_dtr = hs_max_dtr;
 258         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 259         card->mmc_avail_type = avail_type;
 260 }
 261
 262 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 263 {
 264         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 265
 266         /*
 267          * Disable these attributes by default
 268          */
 269         card->ext_csd.enhanced_area_offset = -EINVAL;
 270         card->ext_csd.enhanced_area_size = -EINVAL;
 271
 272         /*
 273          * Enhanced area feature support -- check whether the eMMC
 274          * card has the Enhanced area enabled.  If so, export enhanced
 275          * area offset and size to user by adding sysfs interface.
 276          */
 277         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 278             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 279                 if (card->ext_csd.partition_setting_completed) {
 280                         hc_erase_grp_sz =
 281                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 282                         hc_wp_grp_sz =
 283                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 284
 285                         /*
 286                          * calculate the enhanced data area offset, in bytes
 287                          */
 288                         card->ext_csd.enhanced_area_offset =
 289                                 (((unsigned long long)ext_csd[139]) << 24) +
 290                                 (((unsigned long long)ext_csd[138]) << 16) +
 291                                 (((unsigned long long)ext_csd[137]) << 8) +
 292                                 (((unsigned long long)ext_csd[136]));
 293                         if (mmc_card_blockaddr(card))
 294                                 card->ext_csd.enhanced_area_offset <<= 9;
 295                         /*
 296                          * calculate the enhanced data area size, in kilobytes
 297                          */
 298                         card->ext_csd.enhanced_area_size =
 299                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 300                                 ext_csd[140];
 301                         card->ext_csd.enhanced_area_size *=
 302                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 303                         card->ext_csd.enhanced_area_size <<= 9;
 304                 } else {
 305                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 306                                 mmc_hostname(card->host));
 307                 }
 308         }
 309 }
 310
 311 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 312 {
 313         int idx;
 314         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 315         unsigned int part_size;
 316
 317         /*
 318          * General purpose partition feature support --
 319          * If ext_csd has the size of general purpose partitions,
 320          * set size, part_cfg, partition name in mmc_part.
 321          */
 322         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 323             EXT_CSD_PART_SUPPORT_PART_EN) {
 324                 hc_erase_grp_sz =
 325                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 326                 hc_wp_grp_sz =
 327                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 328
 329                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 330                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 331                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 332                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 333                                 continue;
 334                         if (card->ext_csd.partition_setting_completed == 0) {
 335                                 pr_warn("%s: has partition size defined without partition complete\n",
 336                                         mmc_hostname(card->host));
 337                                 break;
 338                         }
 339                         part_size =
 340                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 341                                 << 16) +
 342                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 343                                 << 8) +
 344                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 345                         part_size *= (size_t)(hc_erase_grp_sz *
 346                                 hc_wp_grp_sz);
 347                         mmc_part_add(card, part_size << 19,
 348                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 349                                 "gp%d", idx, false,
 350                                 MMC_BLK_DATA_AREA_GP);
 351                 }
 352         }
 353 }
 354
 355 /* Minimum partition switch timeout in milliseconds */
 356 #define MMC_MIN_PART_SWITCH_TIME        300
 357
 358 /*
 359  * Decode extended CSD.
 360  */
 361 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 362 {
 363         int err = 0, idx;
 364         unsigned int part_size;
 365         struct device_node *np;
 366         bool broken_hpi = false;
 367
 368         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 369         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 370         if (card->csd.structure == 3) {
 371                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 372                         pr_err("%s: unrecognised EXT_CSD structure "
 373                                 "version %d\n", mmc_hostname(card->host),
 374                                         card->ext_csd.raw_ext_csd_structure);
 375                         err = -EINVAL;
 376                         goto out;
 377                 }
 378         }
 379
 380         np = mmc_of_find_child_device(card->host, 0);
 381         if (np && of_device_is_compatible(np, "mmc-card"))
 382                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 383         of_node_put(np);
 384
 385         /*
 386          * The EXT_CSD format is meant to be forward compatible. As long
 387          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 388          * are authorized, see JEDEC JESD84-B50 section B.8.
 389          */
 390         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 391
 392         /* fixup device after ext_csd revision field is updated */
 393         mmc_fixup_device(card, mmc_ext_csd_fixups);
 394
 395         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 396         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 397         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 398         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 399         if (card->ext_csd.rev >= 2) {
 400                 card->ext_csd.sectors =
 401                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 402                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 403                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 404                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 405
 406                 /* Cards with density > 2GiB are sector addressed */
 407                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 408                         mmc_card_set_blockaddr(card);
 409         }
 410
 411         card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
 412         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 413         mmc_select_card_type(card);
 414
 415         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 416         card->ext_csd.raw_erase_timeout_mult =
 417                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 418         card->ext_csd.raw_hc_erase_grp_size =
 419                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 420         if (card->ext_csd.rev >= 3) {
 421                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 422                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 423
 424                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 425                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 426
 427                 /* Sleep / awake timeout in 100ns units */
 428                 if (sa_shift > 0 && sa_shift <= 0x17)
 429                         card->ext_csd.sa_timeout =
 430                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 431                 card->ext_csd.erase_group_def =
 432                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 433                 card->ext_csd.hc_erase_timeout = 300 *
 434                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 435                 card->ext_csd.hc_erase_size =
 436                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 437
 438                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 439
 440                 /*
 441                  * There are two boot regions of equal size, defined in
 442                  * multiples of 128K.
 443                  */
 444                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 445                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 446                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 447                                 mmc_part_add(card, part_size,
 448                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 449                                         "boot%d", idx, true,
 450                                         MMC_BLK_DATA_AREA_BOOT);
 451                         }
 452                 }
 453         }
 454
 455         card->ext_csd.raw_hc_erase_gap_size =
 456                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 457         card->ext_csd.raw_sec_trim_mult =
 458                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 459         card->ext_csd.raw_sec_erase_mult =
 460                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 461         card->ext_csd.raw_sec_feature_support =
 462                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 463         card->ext_csd.raw_trim_mult =
 464                 ext_csd[EXT_CSD_TRIM_MULT];
 465         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 466         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 467         if (card->ext_csd.rev >= 4) {
 468                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 469                     EXT_CSD_PART_SETTING_COMPLETED)
 470                         card->ext_csd.partition_setting_completed = 1;
 471                 else
 472                         card->ext_csd.partition_setting_completed = 0;
 473
 474                 mmc_manage_enhanced_area(card, ext_csd);
 475
 476                 mmc_manage_gp_partitions(card, ext_csd);
 477
 478                 card->ext_csd.sec_trim_mult =
 479                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 480                 card->ext_csd.sec_erase_mult =
 481                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 482                 card->ext_csd.sec_feature_support =
 483                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 484                 card->ext_csd.trim_timeout = 300 *
 485                         ext_csd[EXT_CSD_TRIM_MULT];
 486
 487                 /*
 488                  * Note that the call to mmc_part_add above defaults to read
 489                  * only. If this default assumption is changed, the call must
 490                  * take into account the value of boot_locked below.
 491                  */
 492                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 493                 card->ext_csd.boot_ro_lockable = true;
 494
 495                 /* Save power class values */
 496                 card->ext_csd.raw_pwr_cl_52_195 =
 497                         ext_csd[EXT_CSD_PWR_CL_52_195];
 498                 card->ext_csd.raw_pwr_cl_26_195 =
 499                         ext_csd[EXT_CSD_PWR_CL_26_195];
 500                 card->ext_csd.raw_pwr_cl_52_360 =
 501                         ext_csd[EXT_CSD_PWR_CL_52_360];
 502                 card->ext_csd.raw_pwr_cl_26_360 =
 503                         ext_csd[EXT_CSD_PWR_CL_26_360];
 504                 card->ext_csd.raw_pwr_cl_200_195 =
 505                         ext_csd[EXT_CSD_PWR_CL_200_195];
 506                 card->ext_csd.raw_pwr_cl_200_360 =
 507                         ext_csd[EXT_CSD_PWR_CL_200_360];
 508                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 509                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 510                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 511                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 512                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 513                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 514         }
 515
 516         if (card->ext_csd.rev >= 5) {
 517                 /* Adjust production date as per JEDEC JESD84-B451 */
 518                 if (card->cid.year < 2010)
 519                         card->cid.year += 16;
 520
 521                 /* check whether the eMMC card supports BKOPS */
 522                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 523                         card->ext_csd.bkops = 1;
 524                         card->ext_csd.man_bkops_en =
 525                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 526                                                 EXT_CSD_MANUAL_BKOPS_MASK);
 527                         card->ext_csd.raw_bkops_status =
 528                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 529                         if (!card->ext_csd.man_bkops_en)
 530                                 pr_debug("%s: MAN_BKOPS_EN bit is not set\n",
 531                                         mmc_hostname(card->host));
 532                 }
 533
 534                 /* check whether the eMMC card supports HPI */
 535                 if (!mmc_card_broken_hpi(card) &&
 536                     !broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
 537                         card->ext_csd.hpi = 1;
 538                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 539                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 540                         else
 541                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 542                         /*
 543                          * Indicate the maximum timeout to close
 544                          * a command interrupted by HPI
 545                          */
 546                         card->ext_csd.out_of_int_time =
 547                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 548                 }
 549
 550                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 551                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 552
 553                 /*
 554                  * RPMB regions are defined in multiples of 128K.
 555                  */
 556                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 557                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 558                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 559                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 560                                 "rpmb", 0, false,
 561                                 MMC_BLK_DATA_AREA_RPMB);
 562                 }
 563         }
 564
 565         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 566         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 567                 card->erased_byte = 0xFF;
 568         else
 569                 card->erased_byte = 0x0;
 570
 571         /* eMMC v4.5 or later */
 572         card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
 573         if (card->ext_csd.rev >= 6) {
 574                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 575
 576                 card->ext_csd.generic_cmd6_time = 10 *
 577                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 578                 card->ext_csd.power_off_longtime = 10 *
 579                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 580
 581                 card->ext_csd.cache_size =
 582                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 583                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 584                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 585                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 586
 587                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 588                         card->ext_csd.data_sector_size = 4096;
 589                 else
 590                         card->ext_csd.data_sector_size = 512;
 591
 592                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 593                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 594                         card->ext_csd.data_tag_unit_size =
 595                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 596                         (card->ext_csd.data_sector_size);
 597                 } else {
 598                         card->ext_csd.data_tag_unit_size = 0;
 599                 }
 600
 601                 card->ext_csd.max_packed_writes =
 602                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 603                 card->ext_csd.max_packed_reads =
 604                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 605         } else {
 606                 card->ext_csd.data_sector_size = 512;
 607         }
 608
 609         /*
 610          * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined
 611          * when accessing a specific field", so use it here if there is no
 612          * PARTITION_SWITCH_TIME.
 613          */
 614         if (!card->ext_csd.part_time)
 615                 card->ext_csd.part_time = card->ext_csd.generic_cmd6_time;
 616         /* Some eMMC set the value too low so set a minimum */
 617         if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
 618                 card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
 619
 620         /* eMMC v5 or later */
 621         if (card->ext_csd.rev >= 7) {
 622                 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
 623                        MMC_FIRMWARE_LEN);
 624                 card->ext_csd.ffu_capable =
 625                         (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
 626                         !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
 627         }
 628 out:
 629         return err;
 630 }
 631
 632 static int mmc_read_ext_csd(struct mmc_card *card)
 633 {
 634         u8 *ext_csd;
 635         int err;
 636
 637         if (!mmc_can_ext_csd(card))
 638                 return 0;
 639
 640         err = mmc_get_ext_csd(card, &ext_csd);
 641         if (err) {
 642                 /* If the host or the card can't do the switch,
 643                  * fail more gracefully. */
 644                 if ((err != -EINVAL)
 645                  && (err != -ENOSYS)
 646                  && (err != -EFAULT))
 647                         return err;
 648
 649                 /*
 650                  * High capacity cards should have this "magic" size
 651                  * stored in their CSD.
 652                  */
 653                 if (card->csd.capacity == (4096 * 512)) {
 654                         pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
 655                                 mmc_hostname(card->host));
 656                 } else {
 657                         pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
 658                                 mmc_hostname(card->host));
 659                         err = 0;
 660                 }
 661
 662                 return err;
 663         }
 664
 665         err = mmc_decode_ext_csd(card, ext_csd);
 666         kfree(ext_csd);
 667         return err;
 668 }
 669
 670 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 671 {
 672         u8 *bw_ext_csd;
 673         int err;
 674
 675         if (bus_width == MMC_BUS_WIDTH_1)
 676                 return 0;
 677
 678         err = mmc_get_ext_csd(card, &bw_ext_csd);
 679         if (err)
 680                 return err;
 681
 682         /* only compare read only fields */
 683         err = !((card->ext_csd.raw_partition_support ==
 684                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 685                 (card->ext_csd.raw_erased_mem_count ==
 686                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 687                 (card->ext_csd.rev ==
 688                         bw_ext_csd[EXT_CSD_REV]) &&
 689                 (card->ext_csd.raw_ext_csd_structure ==
 690                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 691                 (card->ext_csd.raw_card_type ==
 692                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 693                 (card->ext_csd.raw_s_a_timeout ==
 694                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 695                 (card->ext_csd.raw_hc_erase_gap_size ==
 696                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 697                 (card->ext_csd.raw_erase_timeout_mult ==
 698                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 699                 (card->ext_csd.raw_hc_erase_grp_size ==
 700                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 701                 (card->ext_csd.raw_sec_trim_mult ==
 702                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 703                 (card->ext_csd.raw_sec_erase_mult ==
 704                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 705                 (card->ext_csd.raw_sec_feature_support ==
 706                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 707                 (card->ext_csd.raw_trim_mult ==
 708                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 709                 (card->ext_csd.raw_sectors[0] ==
 710                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 711                 (card->ext_csd.raw_sectors[1] ==
 712                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 713                 (card->ext_csd.raw_sectors[2] ==
 714                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 715                 (card->ext_csd.raw_sectors[3] ==
 716                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 717                 (card->ext_csd.raw_pwr_cl_52_195 ==
 718                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 719                 (card->ext_csd.raw_pwr_cl_26_195 ==
 720                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 721                 (card->ext_csd.raw_pwr_cl_52_360 ==
 722                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 723                 (card->ext_csd.raw_pwr_cl_26_360 ==
 724                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 725                 (card->ext_csd.raw_pwr_cl_200_195 ==
 726                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 727                 (card->ext_csd.raw_pwr_cl_200_360 ==
 728                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 729                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 730                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 731                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 732                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 733                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 734                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 735
 736         if (err)
 737                 err = -EINVAL;
 738
 739         kfree(bw_ext_csd);
 740         return err;
 741 }
 742
 743 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 744         card->raw_cid[2], card->raw_cid[3]);
 745 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 746         card->raw_csd[2], card->raw_csd[3]);
 747 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 748 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 749 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 750 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 751 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 752 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 753 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 754 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 755 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 756 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 757 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 758                 card->ext_csd.enhanced_area_offset);
 759 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 760 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 761 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 762 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
 763
 764 static ssize_t mmc_fwrev_show(struct device *dev,
 765                               struct device_attribute *attr,
 766                               char *buf)
 767 {
 768         struct mmc_card *card = mmc_dev_to_card(dev);
 769
 770         if (card->ext_csd.rev < 7) {
 771                 return sprintf(buf, "0x%x\n", card->cid.fwrev);
 772         } else {
 773                 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
 774                                card->ext_csd.fwrev);
 775         }
 776 }
 777
 778 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
 779
 780 static ssize_t mmc_dsr_show(struct device *dev,
 781                             struct device_attribute *attr,
 782                             char *buf)
 783 {
 784         struct mmc_card *card = mmc_dev_to_card(dev);
 785         struct mmc_host *host = card->host;
 786
 787         if (card->csd.dsr_imp && host->dsr_req)
 788                 return sprintf(buf, "0x%x\n", host->dsr);
 789         else
 790                 /* return default DSR value */
 791                 return sprintf(buf, "0x%x\n", 0x404);
 792 }
 793
 794 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
 795
 796 static struct attribute *mmc_std_attrs[] = {
 797         &dev_attr_cid.attr,
 798         &dev_attr_csd.attr,
 799         &dev_attr_date.attr,
 800         &dev_attr_erase_size.attr,
 801         &dev_attr_preferred_erase_size.attr,
 802         &dev_attr_fwrev.attr,
 803         &dev_attr_ffu_capable.attr,
 804         &dev_attr_hwrev.attr,
 805         &dev_attr_manfid.attr,
 806         &dev_attr_name.attr,
 807         &dev_attr_oemid.attr,
 808         &dev_attr_prv.attr,
 809         &dev_attr_serial.attr,
 810         &dev_attr_enhanced_area_offset.attr,
 811         &dev_attr_enhanced_area_size.attr,
 812         &dev_attr_raw_rpmb_size_mult.attr,
 813         &dev_attr_rel_sectors.attr,
 814         &dev_attr_ocr.attr,
 815         &dev_attr_dsr.attr,
 816         NULL,
 817 };
 818 ATTRIBUTE_GROUPS(mmc_std);
 819
 820 static struct device_type mmc_type = {
 821         .groups = mmc_std_groups,
 822 };
 823
 824 /*
 825  * Select the PowerClass for the current bus width
 826  * If power class is defined for 4/8 bit bus in the
 827  * extended CSD register, select it by executing the
 828  * mmc_switch command.
 829  */
 830 static int __mmc_select_powerclass(struct mmc_card *card,
 831                                    unsigned int bus_width)
 832 {
 833         struct mmc_host *host = card->host;
 834         struct mmc_ext_csd *ext_csd = &card->ext_csd;
 835         unsigned int pwrclass_val = 0;
 836         int err = 0;
 837
 838         switch (1 << host->ios.vdd) {
 839         case MMC_VDD_165_195:
 840                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 841                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
 842                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 843                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 844                                 ext_csd->raw_pwr_cl_52_195 :
 845                                 ext_csd->raw_pwr_cl_ddr_52_195;
 846                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 847                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
 848                 break;
 849         case MMC_VDD_27_28:
 850         case MMC_VDD_28_29:
 851         case MMC_VDD_29_30:
 852         case MMC_VDD_30_31:
 853         case MMC_VDD_31_32:
 854         case MMC_VDD_32_33:
 855         case MMC_VDD_33_34:
 856         case MMC_VDD_34_35:
 857         case MMC_VDD_35_36:
 858                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 859                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
 860                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 861                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 862                                 ext_csd->raw_pwr_cl_52_360 :
 863                                 ext_csd->raw_pwr_cl_ddr_52_360;
 864                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 865                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
 866                                 ext_csd->raw_pwr_cl_ddr_200_360 :
 867                                 ext_csd->raw_pwr_cl_200_360;
 868                 break;
 869         default:
 870                 pr_warn("%s: Voltage range not supported for power class\n",
 871                         mmc_hostname(host));
 872                 return -EINVAL;
 873         }
 874
 875         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 876                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 877                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 878         else
 879                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 880                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 881
 882         /* If the power class is different from the default value */
 883         if (pwrclass_val > 0) {
 884                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 885                                  EXT_CSD_POWER_CLASS,
 886                                  pwrclass_val,
 887                                  card->ext_csd.generic_cmd6_time);
 888         }
 889
 890         return err;
 891 }
 892
 893 static int mmc_select_powerclass(struct mmc_card *card)
 894 {
 895         struct mmc_host *host = card->host;
 896         u32 bus_width, ext_csd_bits;
 897         int err, ddr;
 898
 899         /* Power class selection is supported for versions >= 4.0 */
 900         if (!mmc_can_ext_csd(card))
 901                 return 0;
 902
 903         bus_width = host->ios.bus_width;
 904         /* Power class values are defined only for 4/8 bit bus */
 905         if (bus_width == MMC_BUS_WIDTH_1)
 906                 return 0;
 907
 908         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 909         if (ddr)
 910                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 911                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 912         else
 913                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 914                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
 915
 916         err = __mmc_select_powerclass(card, ext_csd_bits);
 917         if (err)
 918                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
 919                         mmc_hostname(host), 1 << bus_width, ddr);
 920
 921         return err;
 922 }
 923
 924 /*
 925  * Set the bus speed for the selected speed mode.
 926  */
 927 static void mmc_set_bus_speed(struct mmc_card *card)
 928 {
 929         unsigned int max_dtr = (unsigned int)-1;
 930
 931         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
 932              max_dtr > card->ext_csd.hs200_max_dtr)
 933                 max_dtr = card->ext_csd.hs200_max_dtr;
 934         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
 935                 max_dtr = card->ext_csd.hs_max_dtr;
 936         else if (max_dtr > card->csd.max_dtr)
 937                 max_dtr = card->csd.max_dtr;
 938
 939         mmc_set_clock(card->host, max_dtr);
 940 }
 941
 942 /*
 943  * Select the bus width amoung 4-bit and 8-bit(SDR).
 944  * If the bus width is changed successfully, return the selected width value.
 945  * Zero is returned instead of error value if the wide width is not supported.
 946  */
 947 static int mmc_select_bus_width(struct mmc_card *card)
 948 {
 949         static unsigned ext_csd_bits[] = {
 950                 EXT_CSD_BUS_WIDTH_8,
 951                 EXT_CSD_BUS_WIDTH_4,
 952         };
 953         static unsigned bus_widths[] = {
 954                 MMC_BUS_WIDTH_8,
 955                 MMC_BUS_WIDTH_4,
 956         };
 957         struct mmc_host *host = card->host;
 958         unsigned idx, bus_width = 0;
 959         int err = 0;
 960
 961         if (!mmc_can_ext_csd(card) ||
 962             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
 963                 return 0;
 964
 965         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
 966
 967         /*
 968          * Unlike SD, MMC cards dont have a configuration register to notify
 969          * supported bus width. So bus test command should be run to identify
 970          * the supported bus width or compare the ext csd values of current
 971          * bus width and ext csd values of 1 bit mode read earlier.
 972          */
 973         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 974                 /*
 975                  * Host is capable of 8bit transfer, then switch
 976                  * the device to work in 8bit transfer mode. If the
 977                  * mmc switch command returns error then switch to
 978                  * 4bit transfer mode. On success set the corresponding
 979                  * bus width on the host.
 980                  */
 981                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 982                                  EXT_CSD_BUS_WIDTH,
 983                                  ext_csd_bits[idx],
 984                                  card->ext_csd.generic_cmd6_time);
 985                 if (err)
 986                         continue;
 987
 988                 bus_width = bus_widths[idx];
 989                 mmc_set_bus_width(host, bus_width);
 990
 991                 /*
 992                  * If controller can't handle bus width test,
 993                  * compare ext_csd previously read in 1 bit mode
 994                  * against ext_csd at new bus width
 995                  */
 996                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 997                         err = mmc_compare_ext_csds(card, bus_width);
 998                 else
 999                         err = mmc_bus_test(card, bus_width);
1000
1001                 if (!err) {
1002                         err = bus_width;
1003                         break;
1004                 } else {
1005                         pr_warn("%s: switch to bus width %d failed\n",
1006                                 mmc_hostname(host), 1 << bus_width);
1007                 }
1008         }
1009
1010         return err;
1011 }
1012
1013 /* Caller must hold re-tuning */
1014 static int mmc_switch_status(struct mmc_card *card)
1015 {
1016         u32 status;
1017         int err;
1018
1019         err = mmc_send_status(card, &status);
1020         if (err)
1021                 return err;
1022
1023         return mmc_switch_status_error(card->host, status);
1024 }
1025
1026 /*
1027  * Switch to the high-speed mode
1028  */
1029 static int mmc_select_hs(struct mmc_card *card)
1030 {
1031         int err;
1032
1033         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1034                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1035                            card->ext_csd.generic_cmd6_time,
1036                            true, false, true);
1037         if (!err) {
1038                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1039                 err = mmc_switch_status(card);
1040         }
1041
1042         if (err)
1043                 pr_warn("%s: switch to high-speed failed, err:%d\n",
1044                         mmc_hostname(card->host), err);
1045
1046         return err;
1047 }
1048
1049 /*
1050  * Activate wide bus and DDR if supported.
1051  */
1052 static int mmc_select_hs_ddr(struct mmc_card *card)
1053 {
1054         struct mmc_host *host = card->host;
1055         u32 bus_width, ext_csd_bits;
1056         int err = 0;
1057
1058         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1059                 return 0;
1060
1061         bus_width = host->ios.bus_width;
1062         if (bus_width == MMC_BUS_WIDTH_1)
1063                 return 0;
1064
1065         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1066                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1067
1068         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1069                         EXT_CSD_BUS_WIDTH,
1070                         ext_csd_bits,
1071                         card->ext_csd.generic_cmd6_time);
1072         if (err) {
1073                 pr_err("%s: switch to bus width %d ddr failed\n",
1074                         mmc_hostname(host), 1 << bus_width);
1075                 return err;
1076         }
1077
1078         /*
1079          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1080          * signaling.
1081          *
1082          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1083          *
1084          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1085          * in the JEDEC spec for DDR.
1086          *
1087          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1088          * host controller can support this, like some of the SDHCI
1089          * controller which connect to an eMMC device. Some of these
1090          * host controller still needs to use 1.8v vccq for supporting
1091          * DDR mode.
1092          *
1093          * So the sequence will be:
1094          * if (host and device can both support 1.2v IO)
1095          *      use 1.2v IO;
1096          * else if (host and device can both support 1.8v IO)
1097          *      use 1.8v IO;
1098          * so if host and device can only support 3.3v IO, this is the
1099          * last choice.
1100          *
1101          * WARNING: eMMC rules are NOT the same as SD DDR
1102          */
1103         err = -EINVAL;
1104         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1105                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1106
1107         if (err && (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V))
1108                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1109
1110         /* make sure vccq is 3.3v after switching disaster */
1111         if (err)
1112                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1113
1114         if (!err)
1115                 mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1116
1117         return err;
1118 }
1119
1120 static int mmc_select_hs400(struct mmc_card *card)
1121 {
1122         struct mmc_host *host = card->host;
1123         unsigned int max_dtr;
1124         int err = 0;
1125         u8 val;
1126
1127         /*
1128          * HS400 mode requires 8-bit bus width
1129          */
1130         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1131               host->ios.bus_width == MMC_BUS_WIDTH_8))
1132                 return 0;
1133
1134         /* Switch card to HS mode */
1135         val = EXT_CSD_TIMING_HS;
1136         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1137                            EXT_CSD_HS_TIMING, val,
1138                            card->ext_csd.generic_cmd6_time,
1139                            true, false, true);
1140         if (err) {
1141                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1142                         mmc_hostname(host), err);
1143                 return err;
1144         }
1145
1146         /* Set host controller to HS timing */
1147         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1148
1149         /* Reduce frequency to HS frequency */
1150         max_dtr = card->ext_csd.hs_max_dtr;
1151         mmc_set_clock(host, max_dtr);
1152
1153         err = mmc_switch_status(card);
1154         if (err)
1155                 goto out_err;
1156
1157         /* Switch card to DDR */
1158         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1159                          EXT_CSD_BUS_WIDTH,
1160                          EXT_CSD_DDR_BUS_WIDTH_8,
1161                          card->ext_csd.generic_cmd6_time);
1162         if (err) {
1163                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1164                         mmc_hostname(host), err);
1165                 return err;
1166         }
1167
1168         /* Switch card to HS400 */
1169         val = EXT_CSD_TIMING_HS400 |
1170               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1171         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1172                            EXT_CSD_HS_TIMING, val,
1173                            card->ext_csd.generic_cmd6_time,
1174                            true, false, true);
1175         if (err) {
1176                 pr_err("%s: switch to hs400 failed, err:%d\n",
1177                          mmc_hostname(host), err);
1178                 return err;
1179         }
1180
1181         /* Set host controller to HS400 timing and frequency */
1182         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1183         mmc_set_bus_speed(card);
1184
1185         err = mmc_switch_status(card);
1186         if (err)
1187                 goto out_err;
1188
1189         return 0;
1190
1191 out_err:
1192         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1193                __func__, err);
1194         return err;
1195 }
1196
1197 int mmc_hs200_to_hs400(struct mmc_card *card)
1198 {
1199         return mmc_select_hs400(card);
1200 }
1201
1202 int mmc_hs400_to_hs200(struct mmc_card *card)
1203 {
1204         struct mmc_host *host = card->host;
1205         unsigned int max_dtr;
1206         int err;
1207         u8 val;
1208
1209         /* Reduce frequency to HS */
1210         max_dtr = card->ext_csd.hs_max_dtr;
1211         mmc_set_clock(host, max_dtr);
1212
1213         /* Switch HS400 to HS DDR */
1214         val = EXT_CSD_TIMING_HS;
1215         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1216                            val, card->ext_csd.generic_cmd6_time,
1217                            true, false, true);
1218         if (err)
1219                 goto out_err;
1220
1221         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1222
1223         err = mmc_switch_status(card);
1224         if (err)
1225                 goto out_err;
1226
1227         /* Switch HS DDR to HS */
1228         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1229                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1230                            true, false, true);
1231         if (err)
1232                 goto out_err;
1233
1234         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1235
1236         err = mmc_switch_status(card);
1237         if (err)
1238                 goto out_err;
1239
1240         /* Switch HS to HS200 */
1241         val = EXT_CSD_TIMING_HS200 |
1242               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1243         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1244                            val, card->ext_csd.generic_cmd6_time,
1245                            true, false, true);
1246         if (err)
1247                 goto out_err;
1248
1249         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1250
1251         err = mmc_switch_status(card);
1252         if (err)
1253                 goto out_err;
1254
1255         mmc_set_bus_speed(card);
1256
1257         return 0;
1258
1259 out_err:
1260         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1261                __func__, err);
1262         return err;
1263 }
1264
1265 static void mmc_select_driver_type(struct mmc_card *card)
1266 {
1267         int card_drv_type, drive_strength, drv_type;
1268
1269         card_drv_type = card->ext_csd.raw_driver_strength |
1270                         mmc_driver_type_mask(0);
1271
1272         drive_strength = mmc_select_drive_strength(card,
1273                                                    card->ext_csd.hs200_max_dtr,
1274                                                    card_drv_type, &drv_type);
1275
1276         card->drive_strength = drive_strength;
1277
1278         if (drv_type)
1279                 mmc_set_driver_type(card->host, drv_type);
1280 }
1281
1282 static int mmc_select_hs400es(struct mmc_card *card)
1283 {
1284         struct mmc_host *host = card->host;
1285         int err = -EINVAL;
1286         u8 val;
1287
1288         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1289                 err = -ENOTSUPP;
1290                 goto out_err;
1291         }
1292
1293         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1294                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1295
1296         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1297                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1298
1299         /* If fails try again during next card power cycle */
1300         if (err)
1301                 goto out_err;
1302
1303         err = mmc_select_bus_width(card);
1304         if (err < 0)
1305                 goto out_err;
1306
1307         /* Switch card to HS mode */
1308         err = mmc_select_hs(card);
1309         if (err)
1310                 goto out_err;
1311
1312         mmc_set_clock(host, card->ext_csd.hs_max_dtr);
1313
1314         err = mmc_switch_status(card);
1315         if (err)
1316                 goto out_err;
1317
1318         /* Switch card to DDR with strobe bit */
1319         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1320         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1321                          EXT_CSD_BUS_WIDTH,
1322                          val,
1323                          card->ext_csd.generic_cmd6_time);
1324         if (err) {
1325                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1326                         mmc_hostname(host), err);
1327                 goto out_err;
1328         }
1329
1330         mmc_select_driver_type(card);
1331
1332         /* Switch card to HS400 */
1333         val = EXT_CSD_TIMING_HS400 |
1334               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1335         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1336                            EXT_CSD_HS_TIMING, val,
1337                            card->ext_csd.generic_cmd6_time,
1338                            true, false, true);
1339         if (err) {
1340                 pr_err("%s: switch to hs400es failed, err:%d\n",
1341                         mmc_hostname(host), err);
1342                 goto out_err;
1343         }
1344
1345         /* Set host controller to HS400 timing and frequency */
1346         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1347
1348         /* Controller enable enhanced strobe function */
1349         host->ios.enhanced_strobe = true;
1350         if (host->ops->hs400_enhanced_strobe)
1351                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1352
1353         err = mmc_switch_status(card);
1354         if (err)
1355                 goto out_err;
1356
1357         return 0;
1358
1359 out_err:
1360         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1361                __func__, err);
1362         return err;
1363 }
1364
1365 /*
1366  * For device supporting HS200 mode, the following sequence
1367  * should be done before executing the tuning process.
1368  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1369  * 2. switch to HS200 mode
1370  * 3. set the clock to > 52Mhz and <=200MHz
1371  */
1372 static int mmc_select_hs200(struct mmc_card *card)
1373 {
1374         struct mmc_host *host = card->host;
1375         unsigned int old_timing, old_signal_voltage;
1376         int err = -EINVAL;
1377         u8 val;
1378
1379         old_signal_voltage = host->ios.signal_voltage;
1380         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1381                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1382
1383         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1384                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1385
1386         /* If fails try again during next card power cycle */
1387         if (err)
1388                 return err;
1389
1390         mmc_select_driver_type(card);
1391
1392         /*
1393          * Set the bus width(4 or 8) with host's support and
1394          * switch to HS200 mode if bus width is set successfully.
1395          */
1396         err = mmc_select_bus_width(card);
1397         if (err > 0) {
1398                 val = EXT_CSD_TIMING_HS200 |
1399                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1400                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1401                                    EXT_CSD_HS_TIMING, val,
1402                                    card->ext_csd.generic_cmd6_time,
1403                                    true, false, true);
1404                 if (err)
1405                         goto err;
1406                 old_timing = host->ios.timing;
1407                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1408
1409                 err = mmc_switch_status(card);
1410                 /*
1411                  * mmc_select_timing() assumes timing has not changed if
1412                  * it is a switch error.
1413                  */
1414                 if (err == -EBADMSG)
1415                         mmc_set_timing(host, old_timing);
1416         }
1417 err:
1418         if (err) {
1419                 /* fall back to the old signal voltage, if fails report error */
1420                 if (__mmc_set_signal_voltage(host, old_signal_voltage))
1421                         err = -EIO;
1422
1423                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1424                        __func__, err);
1425         }
1426         return err;
1427 }
1428
1429 /*
1430  * Activate High Speed, HS200 or HS400ES mode if supported.
1431  */
1432 static int mmc_select_timing(struct mmc_card *card)
1433 {
1434         int err = 0;
1435
1436         if (!mmc_can_ext_csd(card))
1437                 goto bus_speed;
1438
1439         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1440                 err = mmc_select_hs400es(card);
1441         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1442                 err = mmc_select_hs200(card);
1443         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1444                 err = mmc_select_hs(card);
1445
1446         if (err && err != -EBADMSG)
1447                 return err;
1448
1449 bus_speed:
1450         /*
1451          * Set the bus speed to the selected bus timing.
1452          * If timing is not selected, backward compatible is the default.
1453          */
1454         mmc_set_bus_speed(card);
1455         return 0;
1456 }
1457
1458 /*
1459  * Execute tuning sequence to seek the proper bus operating
1460  * conditions for HS200 and HS400, which sends CMD21 to the device.
1461  */
1462 static int mmc_hs200_tuning(struct mmc_card *card)
1463 {
1464         struct mmc_host *host = card->host;
1465
1466         /*
1467          * Timing should be adjusted to the HS400 target
1468          * operation frequency for tuning process
1469          */
1470         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1471             host->ios.bus_width == MMC_BUS_WIDTH_8)
1472                 if (host->ops->prepare_hs400_tuning)
1473                         host->ops->prepare_hs400_tuning(host, &host->ios);
1474
1475         return mmc_execute_tuning(card);
1476 }
1477
1478 /*
1479  * Handle the detection and initialisation of a card.
1480  *
1481  * In the case of a resume, "oldcard" will contain the card
1482  * we're trying to reinitialise.
1483  */
1484 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1485         struct mmc_card *oldcard)
1486 {
1487         struct mmc_card *card;
1488         int err;
1489         u32 cid[4];
1490         u32 rocr;
1491
1492         BUG_ON(!host);
1493         WARN_ON(!host->claimed);
1494
1495         /* Set correct bus mode for MMC before attempting init */
1496         if (!mmc_host_is_spi(host))
1497                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1498
1499         /*
1500          * Since we're changing the OCR value, we seem to
1501          * need to tell some cards to go back to the idle
1502          * state.  We wait 1ms to give cards time to
1503          * respond.
1504          * mmc_go_idle is needed for eMMC that are asleep
1505          */
1506         mmc_go_idle(host);
1507
1508         /* The extra bit indicates that we support high capacity */
1509         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1510         if (err)
1511                 goto err;
1512
1513         /*
1514          * For SPI, enable CRC as appropriate.
1515          */
1516         if (mmc_host_is_spi(host)) {
1517                 err = mmc_spi_set_crc(host, use_spi_crc);
1518                 if (err)
1519                         goto err;
1520         }
1521
1522         /*
1523          * Fetch CID from card.
1524          */
1525         if (mmc_host_is_spi(host))
1526                 err = mmc_send_cid(host, cid);
1527         else
1528                 err = mmc_all_send_cid(host, cid);
1529         if (err)
1530                 goto err;
1531
1532         if (oldcard) {
1533                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1534                         err = -ENOENT;
1535                         goto err;
1536                 }
1537
1538                 card = oldcard;
1539         } else {
1540                 /*
1541                  * Allocate card structure.
1542                  */
1543                 card = mmc_alloc_card(host, &mmc_type);
1544                 if (IS_ERR(card)) {
1545                         err = PTR_ERR(card);
1546                         goto err;
1547                 }
1548
1549                 card->ocr = ocr;
1550                 card->type = MMC_TYPE_MMC;
1551                 card->rca = 1;
1552                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1553         }
1554
1555         /*
1556          * Call the optional HC's init_card function to handle quirks.
1557          */
1558         if (host->ops->init_card)
1559                 host->ops->init_card(host, card);
1560
1561         /*
1562          * For native busses:  set card RCA and quit open drain mode.
1563          */
1564         if (!mmc_host_is_spi(host)) {
1565                 err = mmc_set_relative_addr(card);
1566                 if (err)
1567                         goto free_card;
1568
1569                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1570         }
1571
1572         if (!oldcard) {
1573                 /*
1574                  * Fetch CSD from card.
1575                  */
1576                 err = mmc_send_csd(card, card->raw_csd);
1577                 if (err)
1578                         goto free_card;
1579
1580                 err = mmc_decode_csd(card);
1581                 if (err)
1582                         goto free_card;
1583                 err = mmc_decode_cid(card);
1584                 if (err)
1585                         goto free_card;
1586         }
1587
1588         /*
1589          * handling only for cards supporting DSR and hosts requesting
1590          * DSR configuration
1591          */
1592         if (card->csd.dsr_imp && host->dsr_req)
1593                 mmc_set_dsr(host);
1594
1595         /*
1596          * Select card, as all following commands rely on that.
1597          */
1598         if (!mmc_host_is_spi(host)) {
1599                 err = mmc_select_card(card);
1600                 if (err)
1601                         goto free_card;
1602         }
1603
1604         if (!oldcard) {
1605                 /* Read extended CSD. */
1606                 err = mmc_read_ext_csd(card);
1607                 if (err)
1608                         goto free_card;
1609
1610                 /*
1611                  * If doing byte addressing, check if required to do sector
1612                  * addressing.  Handle the case of <2GB cards needing sector
1613                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1614                  * ocr register has bit 30 set for sector addressing.
1615                  */
1616                 if (rocr & BIT(30))
1617                         mmc_card_set_blockaddr(card);
1618
1619                 /* Erase size depends on CSD and Extended CSD */
1620                 mmc_set_erase_size(card);
1621         }
1622
1623         /*
1624          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1625          * bit.  This bit will be lost every time after a reset or power off.
1626          */
1627         if (card->ext_csd.partition_setting_completed ||
1628             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1629                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1630                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1631                                  card->ext_csd.generic_cmd6_time);
1632
1633                 if (err && err != -EBADMSG)
1634                         goto free_card;
1635
1636                 if (err) {
1637                         err = 0;
1638                         /*
1639                          * Just disable enhanced area off & sz
1640                          * will try to enable ERASE_GROUP_DEF
1641                          * during next time reinit
1642                          */
1643                         card->ext_csd.enhanced_area_offset = -EINVAL;
1644                         card->ext_csd.enhanced_area_size = -EINVAL;
1645                 } else {
1646                         card->ext_csd.erase_group_def = 1;
1647                         /*
1648                          * enable ERASE_GRP_DEF successfully.
1649                          * This will affect the erase size, so
1650                          * here need to reset erase size
1651                          */
1652                         mmc_set_erase_size(card);
1653                 }
1654         }
1655
1656         /*
1657          * Ensure eMMC user default partition is enabled
1658          */
1659         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1660                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1661                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1662                                  card->ext_csd.part_config,
1663                                  card->ext_csd.part_time);
1664                 if (err && err != -EBADMSG)
1665                         goto free_card;
1666         }
1667
1668         /*
1669          * Enable power_off_notification byte in the ext_csd register
1670          */
1671         if (card->ext_csd.rev >= 6) {
1672                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1673                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1674                                  EXT_CSD_POWER_ON,
1675                                  card->ext_csd.generic_cmd6_time);
1676                 if (err && err != -EBADMSG)
1677                         goto free_card;
1678
1679                 /*
1680                  * The err can be -EBADMSG or 0,
1681                  * so check for success and update the flag
1682                  */
1683                 if (!err)
1684                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1685         }
1686
1687         /*
1688          * Select timing interface
1689          */
1690         err = mmc_select_timing(card);
1691         if (err)
1692                 goto free_card;
1693
1694         if (mmc_card_hs200(card)) {
1695                 err = mmc_hs200_tuning(card);
1696                 if (err)
1697                         goto free_card;
1698
1699                 err = mmc_select_hs400(card);
1700                 if (err)
1701                         goto free_card;
1702         } else if (!mmc_card_hs400es(card)) {
1703                 /* Select the desired bus width optionally */
1704                 err = mmc_select_bus_width(card);
1705                 if (err > 0 && mmc_card_hs(card)) {
1706                         err = mmc_select_hs_ddr(card);
1707                         if (err)
1708                                 goto free_card;
1709                 }
1710         }
1711
1712         /*
1713          * Choose the power class with selected bus interface
1714          */
1715         mmc_select_powerclass(card);
1716
1717         /*
1718          * Enable HPI feature (if supported)
1719          */
1720         if (card->ext_csd.hpi) {
1721                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1722                                 EXT_CSD_HPI_MGMT, 1,
1723                                 card->ext_csd.generic_cmd6_time);
1724                 if (err && err != -EBADMSG)
1725                         goto free_card;
1726                 if (err) {
1727                         pr_warn("%s: Enabling HPI failed\n",
1728                                 mmc_hostname(card->host));
1729                         card->ext_csd.hpi_en = 0;
1730                         err = 0;
1731                 } else {
1732                         card->ext_csd.hpi_en = 1;
1733                 }
1734         }
1735
1736         /*
1737          * If cache size is higher than 0, this indicates the existence of cache
1738          * and it can be turned on. Note that some eMMCs from Micron has been
1739          * reported to need ~800 ms timeout, while enabling the cache after
1740          * sudden power failure tests. Let's extend the timeout to a minimum of
1741          * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
1742          */
1743         if (card->ext_csd.cache_size > 0) {
1744                 unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
1745
1746                 timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
1747                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1748                                 EXT_CSD_CACHE_CTRL, 1, timeout_ms);
1749                 if (err && err != -EBADMSG)
1750                         goto free_card;
1751
1752                 /*
1753                  * Only if no error, cache is turned on successfully.
1754                  */
1755                 if (err) {
1756                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1757                                 mmc_hostname(card->host), err);
1758                         card->ext_csd.cache_ctrl = 0;
1759                         err = 0;
1760                 } else {
1761                         card->ext_csd.cache_ctrl = 1;
1762                 }
1763         }
1764
1765         /*
1766          * The mandatory minimum values are defined for packed command.
1767          * read: 5, write: 3
1768          */
1769         if (card->ext_csd.max_packed_writes >= 3 &&
1770             card->ext_csd.max_packed_reads >= 5 &&
1771             host->caps2 & MMC_CAP2_PACKED_CMD) {
1772                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1773                                 EXT_CSD_EXP_EVENTS_CTRL,
1774                                 EXT_CSD_PACKED_EVENT_EN,
1775                                 card->ext_csd.generic_cmd6_time);
1776                 if (err && err != -EBADMSG)
1777                         goto free_card;
1778                 if (err) {
1779                         pr_warn("%s: Enabling packed event failed\n",
1780                                 mmc_hostname(card->host));
1781                         card->ext_csd.packed_event_en = 0;
1782                         err = 0;
1783                 } else {
1784                         card->ext_csd.packed_event_en = 1;
1785                 }
1786         }
1787
1788         if (!oldcard)
1789                 host->card = card;
1790
1791         return 0;
1792
1793 free_card:
1794         if (!oldcard)
1795                 mmc_remove_card(card);
1796 err:
1797         return err;
1798 }
1799
1800 static int mmc_can_sleep(struct mmc_card *card)
1801 {
1802         return (card && card->ext_csd.rev >= 3);
1803 }
1804
1805 static int mmc_sleep(struct mmc_host *host)
1806 {
1807         struct mmc_command cmd = {0};
1808         struct mmc_card *card = host->card;
1809         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1810         int err;
1811
1812         /* Re-tuning can't be done once the card is deselected */
1813         mmc_retune_hold(host);
1814
1815         err = mmc_deselect_cards(host);
1816         if (err)
1817                 goto out_release;
1818
1819         cmd.opcode = MMC_SLEEP_AWAKE;
1820         cmd.arg = card->rca << 16;
1821         cmd.arg |= 1 << 15;
1822
1823         /*
1824          * If the max_busy_timeout of the host is specified, validate it against
1825          * the sleep cmd timeout. A failure means we need to prevent the host
1826          * from doing hw busy detection, which is done by converting to a R1
1827          * response instead of a R1B.
1828          */
1829         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1830                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1831         } else {
1832                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1833                 cmd.busy_timeout = timeout_ms;
1834         }
1835
1836         err = mmc_wait_for_cmd(host, &cmd, 0);
1837         if (err)
1838                 goto out_release;
1839
1840         /*
1841          * If the host does not wait while the card signals busy, then we will
1842          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1843          * SEND_STATUS command to poll the status because that command (and most
1844          * others) is invalid while the card sleeps.
1845          */
1846         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1847                 mmc_delay(timeout_ms);
1848
1849 out_release:
1850         mmc_retune_release(host);
1851         return err;
1852 }
1853
1854 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1855 {
1856         return card &&
1857                 mmc_card_mmc(card) &&
1858                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1859 }
1860
1861 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1862 {
1863         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1864         int err;
1865
1866         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1867         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1868                 timeout = card->ext_csd.power_off_longtime;
1869
1870         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1871                         EXT_CSD_POWER_OFF_NOTIFICATION,
1872                         notify_type, timeout, true, false, false);
1873         if (err)
1874                 pr_err("%s: Power Off Notification timed out, %u\n",
1875                        mmc_hostname(card->host), timeout);
1876
1877         /* Disable the power off notification after the switch operation. */
1878         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1879
1880         return err;
1881 }
1882
1883 /*
1884  * Host is being removed. Free up the current card.
1885  */
1886 static void mmc_remove(struct mmc_host *host)
1887 {
1888         BUG_ON(!host);
1889         BUG_ON(!host->card);
1890
1891         mmc_remove_card(host->card);
1892         host->card = NULL;
1893 }
1894
1895 /*
1896  * Card detection - card is alive.
1897  */
1898 static int mmc_alive(struct mmc_host *host)
1899 {
1900         return mmc_send_status(host->card, NULL);
1901 }
1902
1903 /*
1904  * Card detection callback from host.
1905  */
1906 static void mmc_detect(struct mmc_host *host)
1907 {
1908         int err;
1909
1910         BUG_ON(!host);
1911         BUG_ON(!host->card);
1912
1913         mmc_get_card(host->card);
1914
1915         /*
1916          * Just check if our card has been removed.
1917          */
1918         err = _mmc_detect_card_removed(host);
1919
1920         mmc_put_card(host->card);
1921
1922         if (err) {
1923                 mmc_remove(host);
1924
1925                 mmc_claim_host(host);
1926                 mmc_detach_bus(host);
1927                 mmc_power_off(host);
1928                 mmc_release_host(host);
1929         }
1930 }
1931
1932 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1933 {
1934         int err = 0;
1935         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1936                                         EXT_CSD_POWER_OFF_LONG;
1937
1938         BUG_ON(!host);
1939         BUG_ON(!host->card);
1940
1941         mmc_claim_host(host);
1942
1943         if (mmc_card_suspended(host->card))
1944                 goto out;
1945
1946         if (mmc_card_doing_bkops(host->card)) {
1947                 err = mmc_stop_bkops(host->card);
1948                 if (err)
1949                         goto out;
1950         }
1951
1952         err = mmc_flush_cache(host->card);
1953         if (err)
1954                 goto out;
1955
1956         if (mmc_can_poweroff_notify(host->card) &&
1957                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1958                 err = mmc_poweroff_notify(host->card, notify_type);
1959         else if (mmc_can_sleep(host->card))
1960                 err = mmc_sleep(host);
1961         else if (!mmc_host_is_spi(host))
1962                 err = mmc_deselect_cards(host);
1963
1964         if (!err) {
1965                 mmc_power_off(host);
1966                 mmc_card_set_suspended(host->card);
1967         }
1968 out:
1969         mmc_release_host(host);
1970         return err;
1971 }
1972
1973 /*
1974  * Suspend callback
1975  */
1976 static int mmc_suspend(struct mmc_host *host)
1977 {
1978         int err;
1979
1980         err = _mmc_suspend(host, true);
1981         if (!err) {
1982                 pm_runtime_disable(&host->card->dev);
1983                 pm_runtime_set_suspended(&host->card->dev);
1984         }
1985
1986         return err;
1987 }
1988
1989 /*
1990  * This function tries to determine if the same card is still present
1991  * and, if so, restore all state to it.
1992  */
1993 static int _mmc_resume(struct mmc_host *host)
1994 {
1995         int err = 0;
1996
1997         BUG_ON(!host);
1998         BUG_ON(!host->card);
1999
2000         mmc_claim_host(host);
2001
2002         if (!mmc_card_suspended(host->card))
2003                 goto out;
2004
2005         mmc_power_up(host, host->card->ocr);
2006         err = mmc_init_card(host, host->card->ocr, host->card);
2007         mmc_card_clr_suspended(host->card);
2008
2009 out:
2010         mmc_release_host(host);
2011         return err;
2012 }
2013
2014 /*
2015  * Shutdown callback
2016  */
2017 static int mmc_shutdown(struct mmc_host *host)
2018 {
2019         int err = 0;
2020
2021         /*
2022          * In a specific case for poweroff notify, we need to resume the card
2023          * before we can shutdown it properly.
2024          */
2025         if (mmc_can_poweroff_notify(host->card) &&
2026                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2027                 err = _mmc_resume(host);
2028
2029         if (!err)
2030                 err = _mmc_suspend(host, false);
2031
2032         return err;
2033 }
2034
2035 /*
2036  * Callback for resume.
2037  */
2038 static int mmc_resume(struct mmc_host *host)
2039 {
2040         pm_runtime_enable(&host->card->dev);
2041         return 0;
2042 }
2043
2044 /*
2045  * Callback for runtime_suspend.
2046  */
2047 static int mmc_runtime_suspend(struct mmc_host *host)
2048 {
2049         int err;
2050
2051         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2052                 return 0;
2053
2054         err = _mmc_suspend(host, true);
2055         if (err)
2056                 pr_err("%s: error %d doing aggressive suspend\n",
2057                         mmc_hostname(host), err);
2058
2059         return err;
2060 }
2061
2062 /*
2063  * Callback for runtime_resume.
2064  */
2065 static int mmc_runtime_resume(struct mmc_host *host)
2066 {
2067         int err;
2068
2069         err = _mmc_resume(host);
2070         if (err && err != -ENOMEDIUM)
2071                 pr_err("%s: error %d doing runtime resume\n",
2072                         mmc_hostname(host), err);
2073
2074         return 0;
2075 }
2076
2077 int mmc_can_reset(struct mmc_card *card)
2078 {
2079         u8 rst_n_function;
2080
2081         rst_n_function = card->ext_csd.rst_n_function;
2082         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2083                 return 0;
2084         return 1;
2085 }
2086 EXPORT_SYMBOL(mmc_can_reset);
2087
2088 static int mmc_reset(struct mmc_host *host)
2089 {
2090         struct mmc_card *card = host->card;
2091
2092         /*
2093          * In the case of recovery, we can't expect flushing the cache to work
2094          * always, but we have a go and ignore errors.
2095          */
2096         mmc_flush_cache(host->card);
2097
2098         if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
2099              mmc_can_reset(card)) {
2100                 /* If the card accept RST_n signal, send it. */
2101                 mmc_set_clock(host, host->f_init);
2102                 host->ops->hw_reset(host);
2103                 /* Set initial state and call mmc_set_ios */
2104                 mmc_set_initial_state(host);
2105         } else {
2106                 /* Do a brute force power cycle */
2107                 mmc_power_cycle(host, card->ocr);
2108         }
2109         return mmc_init_card(host, card->ocr, card);
2110 }
2111
2112 static const struct mmc_bus_ops mmc_ops = {
2113         .remove = mmc_remove,
2114         .detect = mmc_detect,
2115         .suspend = mmc_suspend,
2116         .resume = mmc_resume,
2117         .runtime_suspend = mmc_runtime_suspend,
2118         .runtime_resume = mmc_runtime_resume,
2119         .alive = mmc_alive,
2120         .shutdown = mmc_shutdown,
2121         .reset = mmc_reset,
2122 };
2123
2124 /*
2125  * Starting point for MMC card init.
2126  */
2127 int mmc_attach_mmc(struct mmc_host *host)
2128 {
2129         int err;
2130         u32 ocr, rocr;
2131
2132         BUG_ON(!host);
2133         WARN_ON(!host->claimed);
2134
2135         /* Set correct bus mode for MMC before attempting attach */
2136         if (!mmc_host_is_spi(host))
2137                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2138
2139         err = mmc_send_op_cond(host, 0, &ocr);
2140         if (err)
2141                 return err;
2142
2143         mmc_attach_bus(host, &mmc_ops);
2144         if (host->ocr_avail_mmc)
2145                 host->ocr_avail = host->ocr_avail_mmc;
2146
2147         /*
2148          * We need to get OCR a different way for SPI.
2149          */
2150         if (mmc_host_is_spi(host)) {
2151                 err = mmc_spi_read_ocr(host, 1, &ocr);
2152                 if (err)
2153                         goto err;
2154         }
2155
2156         rocr = mmc_select_voltage(host, ocr);
2157
2158         /*
2159          * Can we support the voltage of the card?
2160          */
2161         if (!rocr) {
2162                 err = -EINVAL;
2163                 goto err;
2164         }
2165
2166         /*
2167          * Detect and init the card.
2168          */
2169         err = mmc_init_card(host, rocr, NULL);
2170         if (err)
2171                 goto err;
2172
2173         mmc_release_host(host);
2174         err = mmc_add_card(host->card);
2175         if (err)
2176                 goto remove_card;
2177
2178         mmc_claim_host(host);
2179         return 0;
2180
2181 remove_card:
2182         mmc_remove_card(host->card);
2183         mmc_claim_host(host);
2184         host->card = NULL;
2185 err:
2186         mmc_detach_bus(host);
2187
2188         pr_err("%s: error %d whilst initialising MMC card\n",
2189                 mmc_hostname(host), err);
2190
2191         return err;
2192 }