drivers/mmc/core/mmc.c

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