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         if ((caps2 & MMC_CAP2_HS400_ES) &&
 239                 card->ext_csd.strobe_support &&
 240                 (avail_type & EXT_CSD_CARD_TYPE_HS400))
 241                 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
 242
 243         card->ext_csd.hs_max_dtr = hs_max_dtr;
 244         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 245         card->mmc_avail_type = avail_type;
 246 }
 247
 248 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 249 {
 250         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 251
 252         /*
 253          * Disable these attributes by default
 254          */
 255         card->ext_csd.enhanced_area_offset = -EINVAL;
 256         card->ext_csd.enhanced_area_size = -EINVAL;
 257
 258         /*
 259          * Enhanced area feature support -- check whether the eMMC
 260          * card has the Enhanced area enabled.  If so, export enhanced
 261          * area offset and size to user by adding sysfs interface.
 262          */
 263         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 264             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 265                 if (card->ext_csd.partition_setting_completed) {
 266                         hc_erase_grp_sz =
 267                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 268                         hc_wp_grp_sz =
 269                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 270
 271                         /*
 272                          * calculate the enhanced data area offset, in bytes
 273                          */
 274                         card->ext_csd.enhanced_area_offset =
 275                                 (((unsigned long long)ext_csd[139]) << 24) +
 276                                 (((unsigned long long)ext_csd[138]) << 16) +
 277                                 (((unsigned long long)ext_csd[137]) << 8) +
 278                                 (((unsigned long long)ext_csd[136]));
 279                         if (mmc_card_blockaddr(card))
 280                                 card->ext_csd.enhanced_area_offset <<= 9;
 281                         /*
 282                          * calculate the enhanced data area size, in kilobytes
 283                          */
 284                         card->ext_csd.enhanced_area_size =
 285                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 286                                 ext_csd[140];
 287                         card->ext_csd.enhanced_area_size *=
 288                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 289                         card->ext_csd.enhanced_area_size <<= 9;
 290                 } else {
 291                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 292                                 mmc_hostname(card->host));
 293                 }
 294         }
 295 }
 296
 297 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 298 {
 299         int idx;
 300         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 301         unsigned int part_size;
 302
 303         /*
 304          * General purpose partition feature support --
 305          * If ext_csd has the size of general purpose partitions,
 306          * set size, part_cfg, partition name in mmc_part.
 307          */
 308         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 309             EXT_CSD_PART_SUPPORT_PART_EN) {
 310                 hc_erase_grp_sz =
 311                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 312                 hc_wp_grp_sz =
 313                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 314
 315                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 316                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 317                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 318                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 319                                 continue;
 320                         if (card->ext_csd.partition_setting_completed == 0) {
 321                                 pr_warn("%s: has partition size defined without partition complete\n",
 322                                         mmc_hostname(card->host));
 323                                 break;
 324                         }
 325                         part_size =
 326                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 327                                 << 16) +
 328                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 329                                 << 8) +
 330                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 331                         part_size *= (size_t)(hc_erase_grp_sz *
 332                                 hc_wp_grp_sz);
 333                         mmc_part_add(card, part_size << 19,
 334                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 335                                 "gp%d", idx, false,
 336                                 MMC_BLK_DATA_AREA_GP);
 337                 }
 338         }
 339 }
 340
 341 /*
 342  * Decode extended CSD.
 343  */
 344 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 345 {
 346         int err = 0, idx;
 347         unsigned int part_size;
 348         struct device_node *np;
 349         bool broken_hpi = false;
 350
 351         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 352         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 353         if (card->csd.structure == 3) {
 354                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 355                         pr_err("%s: unrecognised EXT_CSD structure "
 356                                 "version %d\n", mmc_hostname(card->host),
 357                                         card->ext_csd.raw_ext_csd_structure);
 358                         err = -EINVAL;
 359                         goto out;
 360                 }
 361         }
 362
 363         np = mmc_of_find_child_device(card->host, 0);
 364         if (np && of_device_is_compatible(np, "mmc-card"))
 365                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 366         of_node_put(np);
 367
 368         /*
 369          * The EXT_CSD format is meant to be forward compatible. As long
 370          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 371          * are authorized, see JEDEC JESD84-B50 section B.8.
 372          */
 373         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 374
 375         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 376         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 377         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 378         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 379         if (card->ext_csd.rev >= 2) {
 380                 card->ext_csd.sectors =
 381                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 382                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 383                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 384                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 385
 386                 /* Cards with density > 2GiB are sector addressed */
 387                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 388                         mmc_card_set_blockaddr(card);
 389         }
 390
 391         /*
 392          * Enhance Strobe is supported since v5.1 which rev should be
 393          * 8 but some eMMC devices can support it with rev 7. So handle
 394          * Enhance Strobe here.
 395          */
 396         card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
 397
 398         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 399         mmc_select_card_type(card);
 400
 401         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 402         card->ext_csd.raw_erase_timeout_mult =
 403                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 404         card->ext_csd.raw_hc_erase_grp_size =
 405                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 406         if (card->ext_csd.rev >= 3) {
 407                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 408                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 409
 410                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 411                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 412
 413                 /* Sleep / awake timeout in 100ns units */
 414                 if (sa_shift > 0 && sa_shift <= 0x17)
 415                         card->ext_csd.sa_timeout =
 416                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 417                 card->ext_csd.erase_group_def =
 418                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 419                 card->ext_csd.hc_erase_timeout = 300 *
 420                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 421                 card->ext_csd.hc_erase_size =
 422                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 423
 424                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 425
 426                 /*
 427                  * There are two boot regions of equal size, defined in
 428                  * multiples of 128K.
 429                  */
 430                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 431                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 432                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 433                                 mmc_part_add(card, part_size,
 434                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 435                                         "boot%d", idx, true,
 436                                         MMC_BLK_DATA_AREA_BOOT);
 437                         }
 438                 }
 439         }
 440
 441         card->ext_csd.raw_hc_erase_gap_size =
 442                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 443         card->ext_csd.raw_sec_trim_mult =
 444                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 445         card->ext_csd.raw_sec_erase_mult =
 446                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 447         card->ext_csd.raw_sec_feature_support =
 448                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 449         card->ext_csd.raw_trim_mult =
 450                 ext_csd[EXT_CSD_TRIM_MULT];
 451         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 452         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 453         if (card->ext_csd.rev >= 4) {
 454                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 455                     EXT_CSD_PART_SETTING_COMPLETED)
 456                         card->ext_csd.partition_setting_completed = 1;
 457                 else
 458                         card->ext_csd.partition_setting_completed = 0;
 459
 460                 mmc_manage_enhanced_area(card, ext_csd);
 461
 462                 mmc_manage_gp_partitions(card, ext_csd);
 463
 464                 card->ext_csd.sec_trim_mult =
 465                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 466                 card->ext_csd.sec_erase_mult =
 467                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 468                 card->ext_csd.sec_feature_support =
 469                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 470                 card->ext_csd.trim_timeout = 300 *
 471                         ext_csd[EXT_CSD_TRIM_MULT];
 472
 473                 /*
 474                  * Note that the call to mmc_part_add above defaults to read
 475                  * only. If this default assumption is changed, the call must
 476                  * take into account the value of boot_locked below.
 477                  */
 478                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 479                 card->ext_csd.boot_ro_lockable = true;
 480
 481                 /* Save power class values */
 482                 card->ext_csd.raw_pwr_cl_52_195 =
 483                         ext_csd[EXT_CSD_PWR_CL_52_195];
 484                 card->ext_csd.raw_pwr_cl_26_195 =
 485                         ext_csd[EXT_CSD_PWR_CL_26_195];
 486                 card->ext_csd.raw_pwr_cl_52_360 =
 487                         ext_csd[EXT_CSD_PWR_CL_52_360];
 488                 card->ext_csd.raw_pwr_cl_26_360 =
 489                         ext_csd[EXT_CSD_PWR_CL_26_360];
 490                 card->ext_csd.raw_pwr_cl_200_195 =
 491                         ext_csd[EXT_CSD_PWR_CL_200_195];
 492                 card->ext_csd.raw_pwr_cl_200_360 =
 493                         ext_csd[EXT_CSD_PWR_CL_200_360];
 494                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 495                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 496                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 497                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 498                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 499                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 500         }
 501
 502         if (card->ext_csd.rev >= 5) {
 503                 /* Adjust production date as per JEDEC JESD84-B451 */
 504                 if (card->cid.year < 2010)
 505                         card->cid.year += 16;
 506
 507                 /* check whether the eMMC card supports BKOPS */
 508                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 509                         card->ext_csd.bkops = 1;
 510                         card->ext_csd.man_bkops_en =
 511                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 512                                                 EXT_CSD_MANUAL_BKOPS_MASK);
 513                         card->ext_csd.raw_bkops_status =
 514                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 515                         if (!card->ext_csd.man_bkops_en)
 516                                 pr_info("%s: MAN_BKOPS_EN bit is not set\n",
 517                                         mmc_hostname(card->host));
 518                 }
 519
 520                 /* check whether the eMMC card supports HPI */
 521                 if (!broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
 522                         card->ext_csd.hpi = 1;
 523                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 524                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 525                         else
 526                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 527                         /*
 528                          * Indicate the maximum timeout to close
 529                          * a command interrupted by HPI
 530                          */
 531                         card->ext_csd.out_of_int_time =
 532                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 533                 }
 534
 535                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 536                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 537
 538                 /*
 539                  * RPMB regions are defined in multiples of 128K.
 540                  */
 541                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 542                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 543                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 544                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 545                                 "rpmb", 0, false,
 546                                 MMC_BLK_DATA_AREA_RPMB);
 547                 }
 548         }
 549
 550         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 551         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 552                 card->erased_byte = 0xFF;
 553         else
 554                 card->erased_byte = 0x0;
 555
 556         /* eMMC v4.5 or later */
 557         if (card->ext_csd.rev >= 6) {
 558                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 559
 560                 card->ext_csd.generic_cmd6_time = 10 *
 561                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 562                 card->ext_csd.power_off_longtime = 10 *
 563                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 564
 565                 card->ext_csd.cache_size =
 566                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 567                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 568                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 569                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 570
 571                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 572                         card->ext_csd.data_sector_size = 4096;
 573                 else
 574                         card->ext_csd.data_sector_size = 512;
 575
 576                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 577                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 578                         card->ext_csd.data_tag_unit_size =
 579                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 580                         (card->ext_csd.data_sector_size);
 581                 } else {
 582                         card->ext_csd.data_tag_unit_size = 0;
 583                 }
 584
 585                 card->ext_csd.max_packed_writes =
 586                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 587                 card->ext_csd.max_packed_reads =
 588                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 589         } else {
 590                 card->ext_csd.data_sector_size = 512;
 591         }
 592
 593         /* eMMC v5 or later */
 594         if (card->ext_csd.rev >= 7) {
 595                 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
 596                        MMC_FIRMWARE_LEN);
 597                 card->ext_csd.ffu_capable =
 598                         (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
 599                         !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
 600         }
 601 out:
 602         return err;
 603 }
 604
 605 static int mmc_read_ext_csd(struct mmc_card *card)
 606 {
 607         u8 *ext_csd;
 608         int err;
 609
 610         if (!mmc_can_ext_csd(card))
 611                 return 0;
 612
 613         err = mmc_get_ext_csd(card, &ext_csd);
 614         if (err) {
 615                 /* If the host or the card can't do the switch,
 616                  * fail more gracefully. */
 617                 if ((err != -EINVAL)
 618                  && (err != -ENOSYS)
 619                  && (err != -EFAULT))
 620                         return err;
 621
 622                 /*
 623                  * High capacity cards should have this "magic" size
 624                  * stored in their CSD.
 625                  */
 626                 if (card->csd.capacity == (4096 * 512)) {
 627                         pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
 628                                 mmc_hostname(card->host));
 629                 } else {
 630                         pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
 631                                 mmc_hostname(card->host));
 632                         err = 0;
 633                 }
 634
 635                 return err;
 636         }
 637
 638         err = mmc_decode_ext_csd(card, ext_csd);
 639         kfree(ext_csd);
 640         return err;
 641 }
 642
 643 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 644 {
 645         u8 *bw_ext_csd;
 646         int err;
 647
 648         if (bus_width == MMC_BUS_WIDTH_1)
 649                 return 0;
 650
 651         err = mmc_get_ext_csd(card, &bw_ext_csd);
 652         if (err)
 653                 return err;
 654
 655         /* only compare read only fields */
 656         err = !((card->ext_csd.raw_partition_support ==
 657                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 658                 (card->ext_csd.raw_erased_mem_count ==
 659                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 660                 (card->ext_csd.rev ==
 661                         bw_ext_csd[EXT_CSD_REV]) &&
 662                 (card->ext_csd.raw_ext_csd_structure ==
 663                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 664                 (card->ext_csd.raw_card_type ==
 665                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 666                 (card->ext_csd.raw_s_a_timeout ==
 667                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 668                 (card->ext_csd.raw_hc_erase_gap_size ==
 669                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 670                 (card->ext_csd.raw_erase_timeout_mult ==
 671                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 672                 (card->ext_csd.raw_hc_erase_grp_size ==
 673                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 674                 (card->ext_csd.raw_sec_trim_mult ==
 675                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 676                 (card->ext_csd.raw_sec_erase_mult ==
 677                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 678                 (card->ext_csd.raw_sec_feature_support ==
 679                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 680                 (card->ext_csd.raw_trim_mult ==
 681                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 682                 (card->ext_csd.raw_sectors[0] ==
 683                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 684                 (card->ext_csd.raw_sectors[1] ==
 685                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 686                 (card->ext_csd.raw_sectors[2] ==
 687                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 688                 (card->ext_csd.raw_sectors[3] ==
 689                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 690                 (card->ext_csd.raw_pwr_cl_52_195 ==
 691                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 692                 (card->ext_csd.raw_pwr_cl_26_195 ==
 693                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 694                 (card->ext_csd.raw_pwr_cl_52_360 ==
 695                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 696                 (card->ext_csd.raw_pwr_cl_26_360 ==
 697                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 698                 (card->ext_csd.raw_pwr_cl_200_195 ==
 699                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 700                 (card->ext_csd.raw_pwr_cl_200_360 ==
 701                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 702                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 703                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 704                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 705                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 706                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 707                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 708
 709         if (err)
 710                 err = -EINVAL;
 711
 712         kfree(bw_ext_csd);
 713         return err;
 714 }
 715
 716 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 717         card->raw_cid[2], card->raw_cid[3]);
 718 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 719         card->raw_csd[2], card->raw_csd[3]);
 720 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 721 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 722 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 723 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 724 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 725 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 726 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 727 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 728 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 729 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 730 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 731                 card->ext_csd.enhanced_area_offset);
 732 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 733 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 734 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 735
 736 static ssize_t mmc_fwrev_show(struct device *dev,
 737                               struct device_attribute *attr,
 738                               char *buf)
 739 {
 740         struct mmc_card *card = mmc_dev_to_card(dev);
 741
 742         if (card->ext_csd.rev < 7) {
 743                 return sprintf(buf, "0x%x\n", card->cid.fwrev);
 744         } else {
 745                 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
 746                                card->ext_csd.fwrev);
 747         }
 748 }
 749
 750 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
 751
 752 static struct attribute *mmc_std_attrs[] = {
 753         &dev_attr_cid.attr,
 754         &dev_attr_csd.attr,
 755         &dev_attr_date.attr,
 756         &dev_attr_erase_size.attr,
 757         &dev_attr_preferred_erase_size.attr,
 758         &dev_attr_fwrev.attr,
 759         &dev_attr_ffu_capable.attr,
 760         &dev_attr_hwrev.attr,
 761         &dev_attr_manfid.attr,
 762         &dev_attr_name.attr,
 763         &dev_attr_oemid.attr,
 764         &dev_attr_prv.attr,
 765         &dev_attr_serial.attr,
 766         &dev_attr_enhanced_area_offset.attr,
 767         &dev_attr_enhanced_area_size.attr,
 768         &dev_attr_raw_rpmb_size_mult.attr,
 769         &dev_attr_rel_sectors.attr,
 770         NULL,
 771 };
 772 ATTRIBUTE_GROUPS(mmc_std);
 773
 774 static struct device_type mmc_type = {
 775         .groups = mmc_std_groups,
 776 };
 777
 778 /*
 779  * Select the PowerClass for the current bus width
 780  * If power class is defined for 4/8 bit bus in the
 781  * extended CSD register, select it by executing the
 782  * mmc_switch command.
 783  */
 784 static int __mmc_select_powerclass(struct mmc_card *card,
 785                                    unsigned int bus_width)
 786 {
 787         struct mmc_host *host = card->host;
 788         struct mmc_ext_csd *ext_csd = &card->ext_csd;
 789         unsigned int pwrclass_val = 0;
 790         int err = 0;
 791
 792         switch (1 << host->ios.vdd) {
 793         case MMC_VDD_165_195:
 794                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 795                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
 796                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 797                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 798                                 ext_csd->raw_pwr_cl_52_195 :
 799                                 ext_csd->raw_pwr_cl_ddr_52_195;
 800                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 801                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
 802                 break;
 803         case MMC_VDD_27_28:
 804         case MMC_VDD_28_29:
 805         case MMC_VDD_29_30:
 806         case MMC_VDD_30_31:
 807         case MMC_VDD_31_32:
 808         case MMC_VDD_32_33:
 809         case MMC_VDD_33_34:
 810         case MMC_VDD_34_35:
 811         case MMC_VDD_35_36:
 812                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 813                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
 814                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 815                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 816                                 ext_csd->raw_pwr_cl_52_360 :
 817                                 ext_csd->raw_pwr_cl_ddr_52_360;
 818                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 819                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
 820                                 ext_csd->raw_pwr_cl_ddr_200_360 :
 821                                 ext_csd->raw_pwr_cl_200_360;
 822                 break;
 823         default:
 824                 pr_warn("%s: Voltage range not supported for power class\n",
 825                         mmc_hostname(host));
 826                 return -EINVAL;
 827         }
 828
 829         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 830                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 831                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 832         else
 833                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 834                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 835
 836         /* If the power class is different from the default value */
 837         if (pwrclass_val > 0) {
 838                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 839                                  EXT_CSD_POWER_CLASS,
 840                                  pwrclass_val,
 841                                  card->ext_csd.generic_cmd6_time);
 842         }
 843
 844         return err;
 845 }
 846
 847 static int mmc_select_powerclass(struct mmc_card *card)
 848 {
 849         struct mmc_host *host = card->host;
 850         u32 bus_width, ext_csd_bits;
 851         int err, ddr;
 852
 853         /* Power class selection is supported for versions >= 4.0 */
 854         if (!mmc_can_ext_csd(card))
 855                 return 0;
 856
 857         bus_width = host->ios.bus_width;
 858         /* Power class values are defined only for 4/8 bit bus */
 859         if (bus_width == MMC_BUS_WIDTH_1)
 860                 return 0;
 861
 862         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 863         if (ddr)
 864                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 865                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 866         else
 867                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 868                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
 869
 870         err = __mmc_select_powerclass(card, ext_csd_bits);
 871         if (err)
 872                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
 873                         mmc_hostname(host), 1 << bus_width, ddr);
 874
 875         return err;
 876 }
 877
 878 /*
 879  * Set the bus speed for the selected speed mode.
 880  */
 881 static void mmc_set_bus_speed(struct mmc_card *card)
 882 {
 883         unsigned int max_dtr = (unsigned int)-1;
 884
 885         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
 886              max_dtr > card->ext_csd.hs200_max_dtr)
 887                 max_dtr = card->ext_csd.hs200_max_dtr;
 888         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
 889                 max_dtr = card->ext_csd.hs_max_dtr;
 890         else if (max_dtr > card->csd.max_dtr)
 891                 max_dtr = card->csd.max_dtr;
 892
 893         mmc_set_clock(card->host, max_dtr);
 894 }
 895
 896 /*
 897  * Select the bus width amoung 4-bit and 8-bit(SDR).
 898  * If the bus width is changed successfully, return the selected width value.
 899  * Zero is returned instead of error value if the wide width is not supported.
 900  */
 901 static int mmc_select_bus_width(struct mmc_card *card)
 902 {
 903         static unsigned ext_csd_bits[] = {
 904                 EXT_CSD_BUS_WIDTH_8,
 905                 EXT_CSD_BUS_WIDTH_4,
 906         };
 907         static unsigned bus_widths[] = {
 908                 MMC_BUS_WIDTH_8,
 909                 MMC_BUS_WIDTH_4,
 910         };
 911         struct mmc_host *host = card->host;
 912         unsigned idx, bus_width = 0;
 913         int err = 0;
 914
 915         if (!mmc_can_ext_csd(card) ||
 916             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
 917                 return 0;
 918
 919         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
 920
 921         /*
 922          * Unlike SD, MMC cards dont have a configuration register to notify
 923          * supported bus width. So bus test command should be run to identify
 924          * the supported bus width or compare the ext csd values of current
 925          * bus width and ext csd values of 1 bit mode read earlier.
 926          */
 927         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
 928                 /*
 929                  * Host is capable of 8bit transfer, then switch
 930                  * the device to work in 8bit transfer mode. If the
 931                  * mmc switch command returns error then switch to
 932                  * 4bit transfer mode. On success set the corresponding
 933                  * bus width on the host.
 934                  */
 935                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 936                                  EXT_CSD_BUS_WIDTH,
 937                                  ext_csd_bits[idx],
 938                                  card->ext_csd.generic_cmd6_time);
 939                 if (err)
 940                         continue;
 941
 942                 bus_width = bus_widths[idx];
 943                 mmc_set_bus_width(host, bus_width);
 944
 945                 /*
 946                  * If controller can't handle bus width test,
 947                  * compare ext_csd previously read in 1 bit mode
 948                  * against ext_csd at new bus width
 949                  */
 950                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
 951                         err = mmc_compare_ext_csds(card, bus_width);
 952                 else
 953                         err = mmc_bus_test(card, bus_width);
 954
 955                 if (!err) {
 956                         err = bus_width;
 957                         break;
 958                 } else {
 959                         pr_warn("%s: switch to bus width %d failed\n",
 960                                 mmc_hostname(host), ext_csd_bits[idx]);
 961                 }
 962         }
 963
 964         return err;
 965 }
 966
 967 /*
 968  * Switch to the high-speed mode
 969  */
 970 static int mmc_select_hs(struct mmc_card *card)
 971 {
 972         int err;
 973
 974         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 975                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
 976                            card->ext_csd.generic_cmd6_time,
 977                            true, true, true);
 978         if (!err)
 979                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
 980
 981         return err;
 982 }
 983
 984 /*
 985  * Activate wide bus and DDR if supported.
 986  */
 987 static int mmc_select_hs_ddr(struct mmc_card *card)
 988 {
 989         struct mmc_host *host = card->host;
 990         u32 bus_width, ext_csd_bits;
 991         int err = 0;
 992
 993         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
 994                 return 0;
 995
 996         bus_width = host->ios.bus_width;
 997         if (bus_width == MMC_BUS_WIDTH_1)
 998                 return 0;
 999
1000         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1001                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1002
1003         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1004                         EXT_CSD_BUS_WIDTH,
1005                         ext_csd_bits,
1006                         card->ext_csd.generic_cmd6_time);
1007         if (err) {
1008                 pr_err("%s: switch to bus width %d ddr failed\n",
1009                         mmc_hostname(host), 1 << bus_width);
1010                 return err;
1011         }
1012
1013         /*
1014          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1015          * signaling.
1016          *
1017          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1018          *
1019          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1020          * in the JEDEC spec for DDR.
1021          *
1022          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1023          * host controller can support this, like some of the SDHCI
1024          * controller which connect to an eMMC device. Some of these
1025          * host controller still needs to use 1.8v vccq for supporting
1026          * DDR mode.
1027          *
1028          * So the sequence will be:
1029          * if (host and device can both support 1.2v IO)
1030          *      use 1.2v IO;
1031          * else if (host and device can both support 1.8v IO)
1032          *      use 1.8v IO;
1033          * so if host and device can only support 3.3v IO, this is the
1034          * last choice.
1035          *
1036          * WARNING: eMMC rules are NOT the same as SD DDR
1037          */
1038         err = -EINVAL;
1039         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
1040                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1041
1042         if (err && (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V))
1043                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1044
1045         /* make sure vccq is 3.3v after switching disaster */
1046         if (err)
1047                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1048
1049         if (!err)
1050                 mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1051
1052         return err;
1053 }
1054
1055 /* Caller must hold re-tuning */
1056 static int mmc_switch_status(struct mmc_card *card)
1057 {
1058         u32 status;
1059         int err;
1060
1061         err = mmc_send_status(card, &status);
1062         if (err)
1063                 return err;
1064
1065         return mmc_switch_status_error(card->host, status);
1066 }
1067
1068 static int mmc_select_hs400(struct mmc_card *card)
1069 {
1070         struct mmc_host *host = card->host;
1071         bool send_status = true;
1072         unsigned int max_dtr;
1073         int err = 0;
1074         u8 val;
1075
1076         /*
1077          * HS400 mode requires 8-bit bus width
1078          */
1079         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1080               host->ios.bus_width == MMC_BUS_WIDTH_8))
1081                 return 0;
1082
1083         if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
1084                 send_status = false;
1085
1086         /* Switch card to HS mode */
1087         val = EXT_CSD_TIMING_HS;
1088         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1089                            EXT_CSD_HS_TIMING, val,
1090                            card->ext_csd.generic_cmd6_time,
1091                            true, false, true);
1092         if (err) {
1093                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1094                         mmc_hostname(host), err);
1095                 return err;
1096         }
1097
1098         /* Set host controller to HS timing */
1099         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1100
1101         /* Reduce frequency to HS frequency */
1102         max_dtr = card->ext_csd.hs_max_dtr;
1103         mmc_set_clock(host, max_dtr);
1104
1105         if (!send_status) {
1106                 err = mmc_switch_status(card);
1107                 if (err)
1108                         goto out_err;
1109         }
1110
1111         /* Switch card to DDR */
1112         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1113                          EXT_CSD_BUS_WIDTH,
1114                          EXT_CSD_DDR_BUS_WIDTH_8,
1115                          card->ext_csd.generic_cmd6_time);
1116         if (err) {
1117                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1118                         mmc_hostname(host), err);
1119                 return err;
1120         }
1121
1122         /* Switch card to HS400 */
1123         val = EXT_CSD_TIMING_HS400 |
1124               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1125         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1126                            EXT_CSD_HS_TIMING, val,
1127                            card->ext_csd.generic_cmd6_time,
1128                            true, send_status, true);
1129         if (err) {
1130                 pr_err("%s: switch to hs400 failed, err:%d\n",
1131                          mmc_hostname(host), err);
1132                 return err;
1133         }
1134
1135         /* Set host controller to HS400 timing and frequency */
1136         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1137         mmc_set_bus_speed(card);
1138
1139         if (!send_status) {
1140                 err = mmc_switch_status(card);
1141                 if (err)
1142                         goto out_err;
1143         }
1144
1145         return 0;
1146
1147 out_err:
1148         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1149                __func__, err);
1150         return err;
1151 }
1152
1153 int mmc_hs200_to_hs400(struct mmc_card *card)
1154 {
1155         return mmc_select_hs400(card);
1156 }
1157
1158 int mmc_hs400_to_hs200(struct mmc_card *card)
1159 {
1160         struct mmc_host *host = card->host;
1161         bool send_status = true;
1162         unsigned int max_dtr;
1163         int err;
1164         u8 val;
1165
1166         if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
1167                 send_status = false;
1168
1169         /* Reduce frequency to HS */
1170         max_dtr = card->ext_csd.hs_max_dtr;
1171         mmc_set_clock(host, max_dtr);
1172
1173         /* Switch HS400 to HS DDR */
1174         val = EXT_CSD_TIMING_HS;
1175         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1176                            val, card->ext_csd.generic_cmd6_time,
1177                            true, false, true);
1178         if (err)
1179                 goto out_err;
1180
1181         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1182
1183         if (!send_status) {
1184                 err = mmc_switch_status(card);
1185                 if (err)
1186                         goto out_err;
1187         }
1188
1189         /* Switch HS DDR to HS */
1190         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1191                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1192                            true, send_status, true);
1193         if (err)
1194                 goto out_err;
1195
1196         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1197
1198         if (!send_status) {
1199                 err = mmc_switch_status(card);
1200                 if (err)
1201                         goto out_err;
1202         }
1203
1204         /* Switch HS to HS200 */
1205         val = EXT_CSD_TIMING_HS200 |
1206               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1207         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1208                            val, card->ext_csd.generic_cmd6_time, true,
1209                            send_status, true);
1210         if (err)
1211                 goto out_err;
1212
1213         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1214
1215         if (!send_status) {
1216                 err = mmc_switch_status(card);
1217                 if (err)
1218                         goto out_err;
1219         }
1220
1221         mmc_set_bus_speed(card);
1222
1223         return 0;
1224
1225 out_err:
1226         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1227                __func__, err);
1228         return err;
1229 }
1230
1231 static void mmc_select_driver_type(struct mmc_card *card)
1232 {
1233         int card_drv_type, drive_strength, drv_type;
1234
1235         card_drv_type = card->ext_csd.raw_driver_strength |
1236                         mmc_driver_type_mask(0);
1237
1238         drive_strength = mmc_select_drive_strength(card,
1239                                                    card->ext_csd.hs200_max_dtr,
1240                                                    card_drv_type, &drv_type);
1241
1242         card->drive_strength = drive_strength;
1243
1244         if (drv_type)
1245                 mmc_set_driver_type(card->host, drv_type);
1246 }
1247
1248 /*
1249  * For device supporting HS200 mode, the following sequence
1250  * should be done before executing the tuning process.
1251  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1252  * 2. switch to HS200 mode
1253  * 3. set the clock to > 52Mhz and <=200MHz
1254  */
1255 static int mmc_select_hs200(struct mmc_card *card)
1256 {
1257         struct mmc_host *host = card->host;
1258         bool send_status = true;
1259         unsigned int old_timing;
1260         int err = -EINVAL;
1261         u8 val;
1262
1263         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1264                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1265
1266         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1267                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1268
1269         /* If fails try again during next card power cycle */
1270         if (err)
1271                 goto err;
1272
1273         mmc_select_driver_type(card);
1274
1275         if (host->caps & MMC_CAP_WAIT_WHILE_BUSY)
1276                 send_status = false;
1277
1278         /*
1279          * Set the bus width(4 or 8) with host's support and
1280          * switch to HS200 mode if bus width is set successfully.
1281          */
1282         err = mmc_select_bus_width(card);
1283         if (!IS_ERR_VALUE(err)) {
1284                 val = EXT_CSD_TIMING_HS200 |
1285                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1286                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1287                                    EXT_CSD_HS_TIMING, val,
1288                                    card->ext_csd.generic_cmd6_time,
1289                                    true, false, true);
1290                 if (err)
1291                         goto err;
1292                 old_timing = host->ios.timing;
1293                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1294                 if (!send_status) {
1295                         err = mmc_switch_status(card);
1296                         /*
1297                          * mmc_select_timing() assumes timing has not changed if
1298                          * it is a switch error.
1299                          */
1300                         if (err == -EBADMSG)
1301                                 mmc_set_timing(host, old_timing);
1302                 }
1303         }
1304 err:
1305         if (err)
1306                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1307                        __func__, err);
1308         return err;
1309 }
1310
1311 static int mmc_select_hs400es(struct mmc_card *card)
1312 {
1313         struct mmc_host *host = card->host;
1314         int err = 0;
1315         u8 val;
1316
1317         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1318                 err = -ENOTSUPP;
1319                 goto out_err;
1320         }
1321
1322         err = mmc_select_bus_width(card);
1323         if (IS_ERR_VALUE(err))
1324                 goto out_err;
1325
1326         /* Switch card to HS mode */
1327         err = mmc_select_hs(card);
1328         if (err) {
1329                 pr_err("%s: switch to high-speed failed, err:%d\n",
1330                         mmc_hostname(host), err);
1331                 goto out_err;
1332         }
1333
1334         err = mmc_switch_status(card);
1335         if (err)
1336                 goto out_err;
1337
1338         /* Switch card to DDR with strobe bit */
1339         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1340
1341         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1342                          EXT_CSD_BUS_WIDTH,
1343                          val,
1344                          card->ext_csd.generic_cmd6_time);
1345         if (err) {
1346                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1347                         mmc_hostname(host), err);
1348                 goto out_err;
1349         }
1350
1351         /* Switch card to HS400 */
1352         val = EXT_CSD_TIMING_HS400 |
1353               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1354         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1355                            EXT_CSD_HS_TIMING, val,
1356                            card->ext_csd.generic_cmd6_time,
1357                            true, false, true);
1358         if (err) {
1359                 pr_err("%s: switch to hs400es failed, err:%d\n",
1360                          mmc_hostname(host), err);
1361                 goto out_err;
1362         }
1363
1364         /* Set host controller to HS400 timing and frequency */
1365         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1366
1367         /* Controller enable enhanced strobe function */
1368         host->ios.enhanced_strobe = true;
1369         if (host->ops->hs400_enhanced_strobe)
1370                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1371
1372         err = mmc_switch_status(card);
1373         if (err)
1374                 goto out_err;
1375
1376         return 0;
1377
1378 out_err:
1379         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1380                __func__, err);
1381         return err;
1382 }
1383
1384 /*
1385  * Activate High Speed or HS200 or HS400ES mode if supported.
1386  */
1387 static int mmc_select_timing(struct mmc_card *card)
1388 {
1389         int err = 0;
1390
1391         if (!mmc_can_ext_csd(card))
1392                 goto bus_speed;
1393
1394         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1395                 err = mmc_select_hs400es(card);
1396         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1397                 err = mmc_select_hs200(card);
1398         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1399                 err = mmc_select_hs(card);
1400
1401         if (err && err != -EBADMSG)
1402                 return err;
1403
1404         if (err) {
1405                 pr_warn("%s: switch to %s failed\n",
1406                         mmc_card_hs(card) ? "high-speed" :
1407                         (mmc_card_hs200(card) ? "hs200" : ""),
1408                         mmc_hostname(card->host));
1409                 err = 0;
1410         }
1411
1412 bus_speed:
1413         /*
1414          * Set the bus speed to the selected bus timing.
1415          * If timing is not selected, backward compatible is the default.
1416          */
1417         mmc_set_bus_speed(card);
1418         return err;
1419 }
1420
1421 /*
1422  * Execute tuning sequence to seek the proper bus operating
1423  * conditions for HS200 and HS400, which sends CMD21 to the device.
1424  */
1425 static int mmc_hs200_tuning(struct mmc_card *card)
1426 {
1427         struct mmc_host *host = card->host;
1428
1429         /*
1430          * Timing should be adjusted to the HS400 target
1431          * operation frequency for tuning process
1432          */
1433         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1434             host->ios.bus_width == MMC_BUS_WIDTH_8)
1435                 if (host->ops->prepare_hs400_tuning)
1436                         host->ops->prepare_hs400_tuning(host, &host->ios);
1437
1438         return mmc_execute_tuning(card);
1439 }
1440
1441 /*
1442  * Handle the detection and initialisation of a card.
1443  *
1444  * In the case of a resume, "oldcard" will contain the card
1445  * we're trying to reinitialise.
1446  */
1447 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1448         struct mmc_card *oldcard)
1449 {
1450         struct mmc_card *card;
1451         int err;
1452         u32 cid[4];
1453         u32 rocr;
1454
1455         BUG_ON(!host);
1456         WARN_ON(!host->claimed);
1457
1458         /* Set correct bus mode for MMC before attempting init */
1459         if (!mmc_host_is_spi(host))
1460                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1461
1462         /*
1463          * Since we're changing the OCR value, we seem to
1464          * need to tell some cards to go back to the idle
1465          * state.  We wait 1ms to give cards time to
1466          * respond.
1467          * mmc_go_idle is needed for eMMC that are asleep
1468          */
1469         mmc_go_idle(host);
1470
1471         /* The extra bit indicates that we support high capacity */
1472         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1473         if (err)
1474                 goto err;
1475
1476         /*
1477          * For SPI, enable CRC as appropriate.
1478          */
1479         if (mmc_host_is_spi(host)) {
1480                 err = mmc_spi_set_crc(host, use_spi_crc);
1481                 if (err)
1482                         goto err;
1483         }
1484
1485         /*
1486          * Fetch CID from card.
1487          */
1488         if (mmc_host_is_spi(host))
1489                 err = mmc_send_cid(host, cid);
1490         else
1491                 err = mmc_all_send_cid(host, cid);
1492         if (err)
1493                 goto err;
1494
1495         if (oldcard) {
1496                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1497                         err = -ENOENT;
1498                         goto err;
1499                 }
1500
1501                 card = oldcard;
1502         } else {
1503                 /*
1504                  * Allocate card structure.
1505                  */
1506                 card = mmc_alloc_card(host, &mmc_type);
1507                 if (IS_ERR(card)) {
1508                         err = PTR_ERR(card);
1509                         goto err;
1510                 }
1511
1512                 card->ocr = ocr;
1513                 card->type = MMC_TYPE_MMC;
1514                 card->rca = 1;
1515                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1516         }
1517
1518         /*
1519          * Call the optional HC's init_card function to handle quirks.
1520          */
1521         if (host->ops->init_card)
1522                 host->ops->init_card(host, card);
1523
1524         /*
1525          * For native busses:  set card RCA and quit open drain mode.
1526          */
1527         if (!mmc_host_is_spi(host)) {
1528                 err = mmc_set_relative_addr(card);
1529                 if (err)
1530                         goto free_card;
1531
1532                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1533         }
1534
1535         if (!oldcard) {
1536                 /*
1537                  * Fetch CSD from card.
1538                  */
1539                 err = mmc_send_csd(card, card->raw_csd);
1540                 if (err)
1541                         goto free_card;
1542
1543                 err = mmc_decode_csd(card);
1544                 if (err)
1545                         goto free_card;
1546                 err = mmc_decode_cid(card);
1547                 if (err)
1548                         goto free_card;
1549         }
1550
1551         /*
1552          * handling only for cards supporting DSR and hosts requesting
1553          * DSR configuration
1554          */
1555         if (card->csd.dsr_imp && host->dsr_req)
1556                 mmc_set_dsr(host);
1557
1558         /*
1559          * Select card, as all following commands rely on that.
1560          */
1561         if (!mmc_host_is_spi(host)) {
1562                 err = mmc_select_card(card);
1563                 if (err)
1564                         goto free_card;
1565         }
1566
1567         if (!oldcard) {
1568                 /* Read extended CSD. */
1569                 err = mmc_read_ext_csd(card);
1570                 if (err)
1571                         goto free_card;
1572
1573                 /* If doing byte addressing, check if required to do sector
1574                  * addressing.  Handle the case of <2GB cards needing sector
1575                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1576                  * ocr register has bit 30 set for sector addressing.
1577                  */
1578                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
1579                         mmc_card_set_blockaddr(card);
1580
1581                 /* Erase size depends on CSD and Extended CSD */
1582                 mmc_set_erase_size(card);
1583         }
1584
1585         /*
1586          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1587          * bit.  This bit will be lost every time after a reset or power off.
1588          */
1589         if (card->ext_csd.partition_setting_completed ||
1590             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1591                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1592                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1593                                  card->ext_csd.generic_cmd6_time);
1594
1595                 if (err && err != -EBADMSG)
1596                         goto free_card;
1597
1598                 if (err) {
1599                         err = 0;
1600                         /*
1601                          * Just disable enhanced area off & sz
1602                          * will try to enable ERASE_GROUP_DEF
1603                          * during next time reinit
1604                          */
1605                         card->ext_csd.enhanced_area_offset = -EINVAL;
1606                         card->ext_csd.enhanced_area_size = -EINVAL;
1607                 } else {
1608                         card->ext_csd.erase_group_def = 1;
1609                         /*
1610                          * enable ERASE_GRP_DEF successfully.
1611                          * This will affect the erase size, so
1612                          * here need to reset erase size
1613                          */
1614                         mmc_set_erase_size(card);
1615                 }
1616         }
1617
1618         /*
1619          * Ensure eMMC user default partition is enabled
1620          */
1621         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1622                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1623                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1624                                  card->ext_csd.part_config,
1625                                  card->ext_csd.part_time);
1626                 if (err && err != -EBADMSG)
1627                         goto free_card;
1628         }
1629
1630         /*
1631          * Enable power_off_notification byte in the ext_csd register
1632          */
1633         if (card->ext_csd.rev >= 6) {
1634                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1635                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1636                                  EXT_CSD_POWER_ON,
1637                                  card->ext_csd.generic_cmd6_time);
1638                 if (err && err != -EBADMSG)
1639                         goto free_card;
1640
1641                 /*
1642                  * The err can be -EBADMSG or 0,
1643                  * so check for success and update the flag
1644                  */
1645                 if (!err)
1646                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1647         }
1648
1649         /*
1650          * Select timing interface
1651          */
1652         err = mmc_select_timing(card);
1653         if (err)
1654                 goto free_card;
1655
1656         if (mmc_card_hs200(card)) {
1657                 err = mmc_hs200_tuning(card);
1658                 if (err)
1659                         goto free_card;
1660
1661                 err = mmc_select_hs400(card);
1662                 if (err)
1663                         goto free_card;
1664         } else if (mmc_card_hs(card)) {
1665                 /* Select the desired bus width optionally */
1666                 err = mmc_select_bus_width(card);
1667                 if (!IS_ERR_VALUE(err)) {
1668                         err = mmc_select_hs_ddr(card);
1669                         if (err)
1670                                 goto free_card;
1671                 }
1672         }
1673
1674         /*
1675          * Choose the power class with selected bus interface
1676          */
1677         mmc_select_powerclass(card);
1678
1679         /*
1680          * Enable HPI feature (if supported)
1681          */
1682         if (card->ext_csd.hpi) {
1683                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1684                                 EXT_CSD_HPI_MGMT, 1,
1685                                 card->ext_csd.generic_cmd6_time);
1686                 if (err && err != -EBADMSG)
1687                         goto free_card;
1688                 if (err) {
1689                         pr_warn("%s: Enabling HPI failed\n",
1690                                 mmc_hostname(card->host));
1691                         err = 0;
1692                 } else
1693                         card->ext_csd.hpi_en = 1;
1694         }
1695
1696         /*
1697          * If cache size is higher than 0, this indicates
1698          * the existence of cache and it can be turned on.
1699          */
1700         if (card->ext_csd.cache_size > 0) {
1701                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1702                                 EXT_CSD_CACHE_CTRL, 1,
1703                                 card->ext_csd.generic_cmd6_time);
1704                 if (err && err != -EBADMSG)
1705                         goto free_card;
1706
1707                 /*
1708                  * Only if no error, cache is turned on successfully.
1709                  */
1710                 if (err) {
1711                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1712                                 mmc_hostname(card->host), err);
1713                         card->ext_csd.cache_ctrl = 0;
1714                         err = 0;
1715                 } else {
1716                         card->ext_csd.cache_ctrl = 1;
1717                 }
1718         }
1719
1720         /*
1721          * The mandatory minimum values are defined for packed command.
1722          * read: 5, write: 3
1723          */
1724         if (card->ext_csd.max_packed_writes >= 3 &&
1725             card->ext_csd.max_packed_reads >= 5 &&
1726             host->caps2 & MMC_CAP2_PACKED_CMD) {
1727                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1728                                 EXT_CSD_EXP_EVENTS_CTRL,
1729                                 EXT_CSD_PACKED_EVENT_EN,
1730                                 card->ext_csd.generic_cmd6_time);
1731                 if (err && err != -EBADMSG)
1732                         goto free_card;
1733                 if (err) {
1734                         pr_warn("%s: Enabling packed event failed\n",
1735                                 mmc_hostname(card->host));
1736                         card->ext_csd.packed_event_en = 0;
1737                         err = 0;
1738                 } else {
1739                         card->ext_csd.packed_event_en = 1;
1740                 }
1741         }
1742
1743         if (!oldcard)
1744                 host->card = card;
1745
1746         return 0;
1747
1748 free_card:
1749         if (!oldcard)
1750                 mmc_remove_card(card);
1751 err:
1752         return err;
1753 }
1754
1755 static int mmc_can_sleep(struct mmc_card *card)
1756 {
1757         return (card && card->ext_csd.rev >= 3);
1758 }
1759
1760 static int mmc_sleep(struct mmc_host *host)
1761 {
1762         struct mmc_command cmd = {0};
1763         struct mmc_card *card = host->card;
1764         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1765         int err;
1766
1767         /* Re-tuning can't be done once the card is deselected */
1768         mmc_retune_hold(host);
1769
1770         err = mmc_deselect_cards(host);
1771         if (err)
1772                 goto out_release;
1773
1774         cmd.opcode = MMC_SLEEP_AWAKE;
1775         cmd.arg = card->rca << 16;
1776         cmd.arg |= 1 << 15;
1777
1778         /*
1779          * If the max_busy_timeout of the host is specified, validate it against
1780          * the sleep cmd timeout. A failure means we need to prevent the host
1781          * from doing hw busy detection, which is done by converting to a R1
1782          * response instead of a R1B.
1783          */
1784         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1785                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1786         } else {
1787                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1788                 cmd.busy_timeout = timeout_ms;
1789         }
1790
1791         err = mmc_wait_for_cmd(host, &cmd, 0);
1792         if (err)
1793                 goto out_release;
1794
1795         /*
1796          * If the host does not wait while the card signals busy, then we will
1797          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1798          * SEND_STATUS command to poll the status because that command (and most
1799          * others) is invalid while the card sleeps.
1800          */
1801         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1802                 mmc_delay(timeout_ms);
1803
1804 out_release:
1805         mmc_retune_release(host);
1806         return err;
1807 }
1808
1809 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1810 {
1811         return card &&
1812                 mmc_card_mmc(card) &&
1813                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1814 }
1815
1816 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1817 {
1818         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1819         int err;
1820
1821         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1822         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1823                 timeout = card->ext_csd.power_off_longtime;
1824
1825         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1826                         EXT_CSD_POWER_OFF_NOTIFICATION,
1827                         notify_type, timeout, true, false, false);
1828         if (err)
1829                 pr_err("%s: Power Off Notification timed out, %u\n",
1830                        mmc_hostname(card->host), timeout);
1831
1832         /* Disable the power off notification after the switch operation. */
1833         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1834
1835         return err;
1836 }
1837
1838 /*
1839  * Host is being removed. Free up the current card.
1840  */
1841 static void mmc_remove(struct mmc_host *host)
1842 {
1843         BUG_ON(!host);
1844         BUG_ON(!host->card);
1845
1846         mmc_remove_card(host->card);
1847         host->card = NULL;
1848 }
1849
1850 /*
1851  * Card detection - card is alive.
1852  */
1853 static int mmc_alive(struct mmc_host *host)
1854 {
1855         return mmc_send_status(host->card, NULL);
1856 }
1857
1858 /*
1859  * Card detection callback from host.
1860  */
1861 static void mmc_detect(struct mmc_host *host)
1862 {
1863         int err;
1864
1865         BUG_ON(!host);
1866         BUG_ON(!host->card);
1867
1868         mmc_get_card(host->card);
1869
1870         /*
1871          * Just check if our card has been removed.
1872          */
1873         err = _mmc_detect_card_removed(host);
1874
1875         mmc_put_card(host->card);
1876
1877         if (err) {
1878                 mmc_remove(host);
1879
1880                 mmc_claim_host(host);
1881                 mmc_detach_bus(host);
1882                 mmc_power_off(host);
1883                 mmc_release_host(host);
1884         }
1885 }
1886
1887 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1888 {
1889         int err = 0;
1890         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1891                                         EXT_CSD_POWER_OFF_LONG;
1892
1893         BUG_ON(!host);
1894         BUG_ON(!host->card);
1895
1896         mmc_claim_host(host);
1897
1898         if (mmc_card_suspended(host->card))
1899                 goto out;
1900
1901         if (mmc_card_doing_bkops(host->card)) {
1902                 err = mmc_stop_bkops(host->card);
1903                 if (err)
1904                         goto out;
1905         }
1906
1907         err = mmc_flush_cache(host->card);
1908         if (err)
1909                 goto out;
1910
1911         if (mmc_can_poweroff_notify(host->card) &&
1912                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
1913                 err = mmc_poweroff_notify(host->card, notify_type);
1914         else if (mmc_can_sleep(host->card))
1915                 err = mmc_sleep(host);
1916         else if (!mmc_host_is_spi(host))
1917                 err = mmc_deselect_cards(host);
1918
1919         if (!err) {
1920                 mmc_power_off(host);
1921                 mmc_card_set_suspended(host->card);
1922         }
1923 out:
1924         mmc_release_host(host);
1925         return err;
1926 }
1927
1928 /*
1929  * Suspend callback
1930  */
1931 static int mmc_suspend(struct mmc_host *host)
1932 {
1933         int err;
1934
1935         err = _mmc_suspend(host, true);
1936         if (!err) {
1937                 pm_runtime_disable(&host->card->dev);
1938                 pm_runtime_set_suspended(&host->card->dev);
1939         }
1940
1941         return err;
1942 }
1943
1944 /*
1945  * This function tries to determine if the same card is still present
1946  * and, if so, restore all state to it.
1947  */
1948 static int _mmc_resume(struct mmc_host *host)
1949 {
1950         int err = 0;
1951
1952         BUG_ON(!host);
1953         BUG_ON(!host->card);
1954
1955         mmc_claim_host(host);
1956
1957         if (!mmc_card_suspended(host->card))
1958                 goto out;
1959
1960         mmc_power_up(host, host->card->ocr);
1961         err = mmc_init_card(host, host->card->ocr, host->card);
1962         mmc_card_clr_suspended(host->card);
1963
1964 out:
1965         mmc_release_host(host);
1966         return err;
1967 }
1968
1969 /*
1970  * Shutdown callback
1971  */
1972 static int mmc_shutdown(struct mmc_host *host)
1973 {
1974         int err = 0;
1975
1976         /*
1977          * In a specific case for poweroff notify, we need to resume the card
1978          * before we can shutdown it properly.
1979          */
1980         if (mmc_can_poweroff_notify(host->card) &&
1981                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
1982                 err = _mmc_resume(host);
1983
1984         if (!err)
1985                 err = _mmc_suspend(host, false);
1986
1987         return err;
1988 }
1989
1990 /*
1991  * Callback for resume.
1992  */
1993 static int mmc_resume(struct mmc_host *host)
1994 {
1995         int err = 0;
1996
1997         if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
1998                 err = _mmc_resume(host);
1999                 pm_runtime_set_active(&host->card->dev);
2000                 pm_runtime_mark_last_busy(&host->card->dev);
2001         }
2002         pm_runtime_enable(&host->card->dev);
2003
2004         return err;
2005 }
2006
2007 /*
2008  * Callback for runtime_suspend.
2009  */
2010 static int mmc_runtime_suspend(struct mmc_host *host)
2011 {
2012         int err;
2013
2014         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2015                 return 0;
2016
2017         err = _mmc_suspend(host, true);
2018         if (err)
2019                 pr_err("%s: error %d doing aggressive suspend\n",
2020                         mmc_hostname(host), err);
2021
2022         return err;
2023 }
2024
2025 /*
2026  * Callback for runtime_resume.
2027  */
2028 static int mmc_runtime_resume(struct mmc_host *host)
2029 {
2030         int err;
2031
2032         if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
2033                 return 0;
2034
2035         err = _mmc_resume(host);
2036         if (err)
2037                 pr_err("%s: error %d doing aggressive resume\n",
2038                         mmc_hostname(host), err);
2039
2040         return 0;
2041 }
2042
2043 int mmc_can_reset(struct mmc_card *card)
2044 {
2045         u8 rst_n_function;
2046
2047         rst_n_function = card->ext_csd.rst_n_function;
2048         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2049                 return 0;
2050         return 1;
2051 }
2052 EXPORT_SYMBOL(mmc_can_reset);
2053
2054 static int mmc_reset(struct mmc_host *host)
2055 {
2056         struct mmc_card *card = host->card;
2057
2058         if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2059                 return -EOPNOTSUPP;
2060
2061         if (!mmc_can_reset(card))
2062                 return -EOPNOTSUPP;
2063
2064         mmc_set_clock(host, host->f_init);
2065
2066         host->ops->hw_reset(host);
2067
2068         /* Set initial state and call mmc_set_ios */
2069         mmc_set_initial_state(host);
2070
2071         return mmc_init_card(host, card->ocr, card);
2072 }
2073
2074 static const struct mmc_bus_ops mmc_ops = {
2075         .remove = mmc_remove,
2076         .detect = mmc_detect,
2077         .suspend = mmc_suspend,
2078         .resume = mmc_resume,
2079         .runtime_suspend = mmc_runtime_suspend,
2080         .runtime_resume = mmc_runtime_resume,
2081         .alive = mmc_alive,
2082         .shutdown = mmc_shutdown,
2083         .reset = mmc_reset,
2084 };
2085
2086 /*
2087  * Starting point for MMC card init.
2088  */
2089 int mmc_attach_mmc(struct mmc_host *host)
2090 {
2091         int err;
2092         u32 ocr, rocr;
2093
2094         BUG_ON(!host);
2095         WARN_ON(!host->claimed);
2096
2097         /* Set correct bus mode for MMC before attempting attach */
2098         if (!mmc_host_is_spi(host))
2099                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2100
2101         err = mmc_send_op_cond(host, 0, &ocr);
2102         if (err)
2103                 return err;
2104
2105         mmc_attach_bus(host, &mmc_ops);
2106         if (host->ocr_avail_mmc)
2107                 host->ocr_avail = host->ocr_avail_mmc;
2108
2109         /*
2110          * We need to get OCR a different way for SPI.
2111          */
2112         if (mmc_host_is_spi(host)) {
2113                 err = mmc_spi_read_ocr(host, 1, &ocr);
2114                 if (err)
2115                         goto err;
2116         }
2117
2118         rocr = mmc_select_voltage(host, ocr);
2119
2120         /*
2121          * Can we support the voltage of the card?
2122          */
2123         if (!rocr) {
2124                 err = -EINVAL;
2125                 goto err;
2126         }
2127
2128         /*
2129          * Detect and init the card.
2130          */
2131         err = mmc_init_card(host, rocr, NULL);
2132         if (err)
2133                 goto err;
2134
2135         mmc_release_host(host);
2136         err = mmc_add_card(host->card);
2137         if (err)
2138                 goto remove_card;
2139
2140         mmc_claim_host(host);
2141         return 0;
2142
2143 remove_card:
2144         mmc_remove_card(host->card);
2145         mmc_claim_host(host);
2146         host->card = NULL;
2147 err:
2148         mmc_detach_bus(host);
2149
2150         pr_err("%s: error %d whilst initialising MMC card\n",
2151                 mmc_hostname(host), err);
2152
2153         return err;
2154 }