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