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