drivers/mmc/core/mmc.c

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