drivers/mmc/core/mmc.c

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