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/slab.h>
  15 #include <linux/stat.h>
  16 #include <linux/pm_runtime.h>
  17
  18 #include <linux/mmc/host.h>
  19 #include <linux/mmc/card.h>
  20 #include <linux/mmc/mmc.h>
  21
  22 #include "core.h"
  23 #include "bus.h"
  24 #include "mmc_ops.h"
  25 #include "sd_ops.h"
  26
  27 static const unsigned int tran_exp[] = {
  28         10000,          100000,         1000000,        10000000,
  29         0,              0,              0,              0
  30 };
  31
  32 static const unsigned char tran_mant[] = {
  33         0,      10,     12,     13,     15,     20,     25,     30,
  34         35,     40,     45,     50,     55,     60,     70,     80,
  35 };
  36
  37 static const unsigned int tacc_exp[] = {
  38         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  39 };
  40
  41 static const unsigned int tacc_mant[] = {
  42         0,      10,     12,     13,     15,     20,     25,     30,
  43         35,     40,     45,     50,     55,     60,     70,     80,
  44 };
  45
  46 #define UNSTUFF_BITS(resp,start,size)                                   \
  47         ({                                                              \
  48                 const int __size = size;                                \
  49                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  50                 const int __off = 3 - ((start) / 32);                   \
  51                 const int __shft = (start) & 31;                        \
  52                 u32 __res;                                              \
  53                                                                         \
  54                 __res = resp[__off] >> __shft;                          \
  55                 if (__size + __shft > 32)                               \
  56                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  57                 __res & __mask;                                         \
  58         })
  59
  60 /*
  61  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  62  */
  63 static int mmc_decode_cid(struct mmc_card *card)
  64 {
  65         u32 *resp = card->raw_cid;
  66
  67         /*
  68          * The selection of the format here is based upon published
  69          * specs from sandisk and from what people have reported.
  70          */
  71         switch (card->csd.mmca_vsn) {
  72         case 0: /* MMC v1.0 - v1.2 */
  73         case 1: /* MMC v1.4 */
  74                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  75                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  76                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  77                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  78                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  79                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  80                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  81                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  82                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  83                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  84                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  85                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  86                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  87                 break;
  88
  89         case 2: /* MMC v2.0 - v2.2 */
  90         case 3: /* MMC v3.1 - v3.3 */
  91         case 4: /* MMC v4 */
  92                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
  93                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
  94                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  95                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  96                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  97                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  98                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  99                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 100                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 101                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 102                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 103                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 104                 break;
 105
 106         default:
 107                 pr_err("%s: card has unknown MMCA version %d\n",
 108                         mmc_hostname(card->host), card->csd.mmca_vsn);
 109                 return -EINVAL;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static void mmc_set_erase_size(struct mmc_card *card)
 116 {
 117         if (card->ext_csd.erase_group_def & 1)
 118                 card->erase_size = card->ext_csd.hc_erase_size;
 119         else
 120                 card->erase_size = card->csd.erase_size;
 121
 122         mmc_init_erase(card);
 123 }
 124
 125 /*
 126  * Given a 128-bit response, decode to our card CSD structure.
 127  */
 128 static int mmc_decode_csd(struct mmc_card *card)
 129 {
 130         struct mmc_csd *csd = &card->csd;
 131         unsigned int e, m, a, b;
 132         u32 *resp = card->raw_csd;
 133
 134         /*
 135          * We only understand CSD structure v1.1 and v1.2.
 136          * v1.2 has extra information in bits 15, 11 and 10.
 137          * We also support eMMC v4.4 & v4.41.
 138          */
 139         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 140         if (csd->structure == 0) {
 141                 pr_err("%s: unrecognised CSD structure version %d\n",
 142                         mmc_hostname(card->host), csd->structure);
 143                 return -EINVAL;
 144         }
 145
 146         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 147         m = UNSTUFF_BITS(resp, 115, 4);
 148         e = UNSTUFF_BITS(resp, 112, 3);
 149         csd->tacc_ns     = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
 150         csd->tacc_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 151
 152         m = UNSTUFF_BITS(resp, 99, 4);
 153         e = UNSTUFF_BITS(resp, 96, 3);
 154         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 155         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 156
 157         e = UNSTUFF_BITS(resp, 47, 3);
 158         m = UNSTUFF_BITS(resp, 62, 12);
 159         csd->capacity     = (1 + m) << (e + 2);
 160
 161         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 162         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 163         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 164         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 165         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 166         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 167         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 168
 169         if (csd->write_blkbits >= 9) {
 170                 a = UNSTUFF_BITS(resp, 42, 5);
 171                 b = UNSTUFF_BITS(resp, 37, 5);
 172                 csd->erase_size = (a + 1) * (b + 1);
 173                 csd->erase_size <<= csd->write_blkbits - 9;
 174         }
 175
 176         return 0;
 177 }
 178
 179 /*
 180  * Read extended CSD.
 181  */
 182 static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 183 {
 184         int err;
 185         u8 *ext_csd;
 186
 187         BUG_ON(!card);
 188         BUG_ON(!new_ext_csd);
 189
 190         *new_ext_csd = NULL;
 191
 192         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
 193                 return 0;
 194
 195         /*
 196          * As the ext_csd is so large and mostly unused, we don't store the
 197          * raw block in mmc_card.
 198          */
 199         ext_csd = kmalloc(512, GFP_KERNEL);
 200         if (!ext_csd) {
 201                 pr_err("%s: could not allocate a buffer to "
 202                         "receive the ext_csd.\n", mmc_hostname(card->host));
 203                 return -ENOMEM;
 204         }
 205
 206         err = mmc_send_ext_csd(card, ext_csd);
 207         if (err) {
 208                 kfree(ext_csd);
 209                 *new_ext_csd = NULL;
 210
 211                 /* If the host or the card can't do the switch,
 212                  * fail more gracefully. */
 213                 if ((err != -EINVAL)
 214                  && (err != -ENOSYS)
 215                  && (err != -EFAULT))
 216                         return err;
 217
 218                 /*
 219                  * High capacity cards should have this "magic" size
 220                  * stored in their CSD.
 221                  */
 222                 if (card->csd.capacity == (4096 * 512)) {
 223                         pr_err("%s: unable to read EXT_CSD "
 224                                 "on a possible high capacity card. "
 225                                 "Card will be ignored.\n",
 226                                 mmc_hostname(card->host));
 227                 } else {
 228                         pr_warning("%s: unable to read "
 229                                 "EXT_CSD, performance might "
 230                                 "suffer.\n",
 231                                 mmc_hostname(card->host));
 232                         err = 0;
 233                 }
 234         } else
 235                 *new_ext_csd = ext_csd;
 236
 237         return err;
 238 }
 239
 240 static void mmc_select_card_type(struct mmc_card *card)
 241 {
 242         struct mmc_host *host = card->host;
 243         u8 card_type = card->ext_csd.raw_card_type;
 244         u32 caps = host->caps, caps2 = host->caps2;
 245         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 246         unsigned int avail_type = 0;
 247
 248         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 249             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 250                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 251                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 252         }
 253
 254         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 255             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 256                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 257                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 258         }
 259
 260         if (caps & MMC_CAP_1_8V_DDR &&
 261             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 262                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 263                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 264         }
 265
 266         if (caps & MMC_CAP_1_2V_DDR &&
 267             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 268                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 269                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 270         }
 271
 272         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 273             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 274                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 275                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 276         }
 277
 278         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 279             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 280                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 281                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 282         }
 283
 284         if (caps2 & MMC_CAP2_HS400_1_8V &&
 285             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 286                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 287                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 288         }
 289
 290         if (caps2 & MMC_CAP2_HS400_1_2V &&
 291             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 292                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 293                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 294         }
 295
 296         card->ext_csd.hs_max_dtr = hs_max_dtr;
 297         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 298         card->mmc_avail_type = avail_type;
 299 }
 300
 301 /*
 302  * Decode extended CSD.
 303  */
 304 static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 305 {
 306         int err = 0, idx;
 307         unsigned int part_size;
 308         u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
 309
 310         BUG_ON(!card);
 311
 312         if (!ext_csd)
 313                 return 0;
 314
 315         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 316         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 317         if (card->csd.structure == 3) {
 318                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 319                         pr_err("%s: unrecognised EXT_CSD structure "
 320                                 "version %d\n", mmc_hostname(card->host),
 321                                         card->ext_csd.raw_ext_csd_structure);
 322                         err = -EINVAL;
 323                         goto out;
 324                 }
 325         }
 326
 327         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 328         if (card->ext_csd.rev > 7) {
 329                 pr_err("%s: unrecognised EXT_CSD revision %d\n",
 330                         mmc_hostname(card->host), card->ext_csd.rev);
 331                 err = -EINVAL;
 332                 goto out;
 333         }
 334
 335         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 336         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 337         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 338         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 339         if (card->ext_csd.rev >= 2) {
 340                 card->ext_csd.sectors =
 341                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 342                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 343                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 344                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 345
 346                 /* Cards with density > 2GiB are sector addressed */
 347                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 348                         mmc_card_set_blockaddr(card);
 349         }
 350
 351         card->ext_csd.boot_info = ext_csd[EXT_CSD_BOOT_INFO];
 352         card->ext_csd.boot_config = ext_csd[EXT_CSD_PART_CONFIG];
 353         card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT];
 354         card->ext_csd.boot_bus_width = ext_csd[EXT_CSD_BOOT_BUS_WIDTH];
 355
 356         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 357         mmc_select_card_type(card);
 358
 359         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 360         card->ext_csd.raw_erase_timeout_mult =
 361                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 362         card->ext_csd.raw_hc_erase_grp_size =
 363                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 364         if (card->ext_csd.rev >= 3) {
 365                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 366                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 367
 368                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 369                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 370
 371                 /* Sleep / awake timeout in 100ns units */
 372                 if (sa_shift > 0 && sa_shift <= 0x17)
 373                         card->ext_csd.sa_timeout =
 374                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 375                 card->ext_csd.erase_group_def =
 376                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 377                 card->ext_csd.hc_erase_timeout = 300 *
 378                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 379                 card->ext_csd.hc_erase_size =
 380                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 381
 382                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 383
 384                 /*
 385                  * There are two boot regions of equal size, defined in
 386                  * multiples of 128K.
 387                  */
 388                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 389                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 390                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 391                                 mmc_part_add(card, part_size,
 392                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 393                                         "boot%d", idx, true,
 394                                         MMC_BLK_DATA_AREA_BOOT);
 395                         }
 396                 }
 397         }
 398
 399         card->ext_csd.raw_hc_erase_gap_size =
 400                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 401         card->ext_csd.raw_sec_trim_mult =
 402                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 403         card->ext_csd.raw_sec_erase_mult =
 404                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 405         card->ext_csd.raw_sec_feature_support =
 406                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 407         card->ext_csd.raw_trim_mult =
 408                 ext_csd[EXT_CSD_TRIM_MULT];
 409         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 410         if (card->ext_csd.rev >= 4) {
 411                 /*
 412                  * Enhanced area feature support -- check whether the eMMC
 413                  * card has the Enhanced area enabled.  If so, export enhanced
 414                  * area offset and size to user by adding sysfs interface.
 415                  */
 416                 if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 417                     (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 418                         hc_erase_grp_sz =
 419                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 420                         hc_wp_grp_sz =
 421                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 422
 423                         card->ext_csd.enhanced_area_en = 1;
 424                         /*
 425                          * calculate the enhanced data area offset, in bytes
 426                          */
 427                         card->ext_csd.enhanced_area_offset =
 428                                 (ext_csd[139] << 24) + (ext_csd[138] << 16) +
 429                                 (ext_csd[137] << 8) + ext_csd[136];
 430                         if (mmc_card_blockaddr(card))
 431                                 card->ext_csd.enhanced_area_offset <<= 9;
 432                         /*
 433                          * calculate the enhanced data area size, in kilobytes
 434                          */
 435                         card->ext_csd.enhanced_area_size =
 436                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 437                                 ext_csd[140];
 438                         card->ext_csd.enhanced_area_size *=
 439                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 440                         card->ext_csd.enhanced_area_size <<= 9;
 441                 } else {
 442                         /*
 443                          * If the enhanced area is not enabled, disable these
 444                          * device attributes.
 445                          */
 446                         card->ext_csd.enhanced_area_offset = -EINVAL;
 447                         card->ext_csd.enhanced_area_size = -EINVAL;
 448                 }
 449
 450                 /*
 451                  * General purpose partition feature support --
 452                  * If ext_csd has the size of general purpose partitions,
 453                  * set size, part_cfg, partition name in mmc_part.
 454                  */
 455                 if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 456                         EXT_CSD_PART_SUPPORT_PART_EN) {
 457                         if (card->ext_csd.enhanced_area_en != 1) {
 458                                 hc_erase_grp_sz =
 459                                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 460                                 hc_wp_grp_sz =
 461                                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 462
 463                                 card->ext_csd.enhanced_area_en = 1;
 464                         }
 465
 466                         for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 467                                 if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 468                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 469                                 !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 470                                         continue;
 471                                 part_size =
 472                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 473                                         << 16) +
 474                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 475                                         << 8) +
 476                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 477                                 part_size *= (size_t)(hc_erase_grp_sz *
 478                                         hc_wp_grp_sz);
 479                                 mmc_part_add(card, part_size << 19,
 480                                         EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 481                                         "gp%d", idx, false,
 482                                         MMC_BLK_DATA_AREA_GP);
 483                         }
 484                 }
 485                 card->ext_csd.sec_trim_mult =
 486                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 487                 card->ext_csd.sec_erase_mult =
 488                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 489                 card->ext_csd.sec_feature_support =
 490                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 491                 card->ext_csd.trim_timeout = 300 *
 492                         ext_csd[EXT_CSD_TRIM_MULT];
 493
 494                 /*
 495                  * Note that the call to mmc_part_add above defaults to read
 496                  * only. If this default assumption is changed, the call must
 497                  * take into account the value of boot_locked below.
 498                  */
 499                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 500                 card->ext_csd.boot_ro_lockable = true;
 501
 502                 /* Save power class values */
 503                 card->ext_csd.raw_pwr_cl_52_195 =
 504                         ext_csd[EXT_CSD_PWR_CL_52_195];
 505                 card->ext_csd.raw_pwr_cl_26_195 =
 506                         ext_csd[EXT_CSD_PWR_CL_26_195];
 507                 card->ext_csd.raw_pwr_cl_52_360 =
 508                         ext_csd[EXT_CSD_PWR_CL_52_360];
 509                 card->ext_csd.raw_pwr_cl_26_360 =
 510                         ext_csd[EXT_CSD_PWR_CL_26_360];
 511                 card->ext_csd.raw_pwr_cl_200_195 =
 512                         ext_csd[EXT_CSD_PWR_CL_200_195];
 513                 card->ext_csd.raw_pwr_cl_200_360 =
 514                         ext_csd[EXT_CSD_PWR_CL_200_360];
 515                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 516                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 517                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 518                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 519                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 520                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 521         }
 522
 523         if (card->ext_csd.rev >= 5) {
 524                 /* Adjust production date as per JEDEC JESD84-B451 */
 525                 if (card->cid.year < 2010)
 526                         card->cid.year += 16;
 527
 528                 /* check whether the eMMC card supports BKOPS */
 529                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 530                         card->ext_csd.bkops = 1;
 531                         card->ext_csd.bkops_en = ext_csd[EXT_CSD_BKOPS_EN];
 532                         card->ext_csd.raw_bkops_status =
 533                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 534                         if (!card->ext_csd.bkops_en)
 535                                 pr_info("%s: BKOPS_EN bit is not set\n",
 536                                         mmc_hostname(card->host));
 537                 }
 538
 539                 /* check whether the eMMC card supports HPI */
 540                 if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1) {
 541                         card->ext_csd.hpi = 1;
 542                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 543                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 544                         else
 545                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 546                         /*
 547                          * Indicate the maximum timeout to close
 548                          * a command interrupted by HPI
 549                          */
 550                         card->ext_csd.out_of_int_time =
 551                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 552                 }
 553
 554                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 555                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 556
 557                 /*
 558                  * RPMB regions are defined in multiples of 128K.
 559                  */
 560                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 561                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 562                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 563                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 564                                 "rpmb", 0, false,
 565                                 MMC_BLK_DATA_AREA_RPMB);
 566                 }
 567         }
 568
 569         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 570         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 571                 card->erased_byte = 0xFF;
 572         else
 573                 card->erased_byte = 0x0;
 574
 575         /* eMMC v4.5 or later */
 576         if (card->ext_csd.rev >= 6) {
 577                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 578
 579                 card->ext_csd.generic_cmd6_time = 10 *
 580                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 581                 card->ext_csd.power_off_longtime = 10 *
 582                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 583
 584                 card->ext_csd.cache_size =
 585                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 586                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 587                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 588                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 589
 590                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 591                         card->ext_csd.data_sector_size = 4096;
 592                 else
 593                         card->ext_csd.data_sector_size = 512;
 594
 595                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 596                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 597                         card->ext_csd.data_tag_unit_size =
 598                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 599                         (card->ext_csd.data_sector_size);
 600                 } else {
 601                         card->ext_csd.data_tag_unit_size = 0;
 602                 }
 603
 604                 card->ext_csd.max_packed_writes =
 605                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 606                 card->ext_csd.max_packed_reads =
 607                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 608         } else {
 609                 card->ext_csd.data_sector_size = 512;
 610         }
 611
 612 out:
 613         return err;
 614 }
 615
 616 static inline void mmc_free_ext_csd(u8 *ext_csd)
 617 {
 618         kfree(ext_csd);
 619 }
 620
 621
 622 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 623 {
 624         u8 *bw_ext_csd;
 625         int err;
 626
 627         if (bus_width == MMC_BUS_WIDTH_1)
 628                 return 0;
 629
 630         err = mmc_get_ext_csd(card, &bw_ext_csd);
 631
 632         if (err || bw_ext_csd == NULL) {
 633                 err = -EINVAL;
 634                 goto out;
 635         }
 636
 637         /* only compare read only fields */
 638         err = !((card->ext_csd.raw_partition_support ==
 639                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 640                 (card->ext_csd.raw_erased_mem_count ==
 641                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 642                 (card->ext_csd.rev ==
 643                         bw_ext_csd[EXT_CSD_REV]) &&
 644                 (card->ext_csd.raw_ext_csd_structure ==
 645                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 646                 (card->ext_csd.raw_card_type ==
 647                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 648                 (card->ext_csd.raw_s_a_timeout ==
 649                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 650                 (card->ext_csd.raw_hc_erase_gap_size ==
 651                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 652                 (card->ext_csd.raw_erase_timeout_mult ==
 653                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 654                 (card->ext_csd.raw_hc_erase_grp_size ==
 655                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 656                 (card->ext_csd.raw_sec_trim_mult ==
 657                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 658                 (card->ext_csd.raw_sec_erase_mult ==
 659                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 660                 (card->ext_csd.raw_sec_feature_support ==
 661                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 662                 (card->ext_csd.raw_trim_mult ==
 663                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 664                 (card->ext_csd.raw_sectors[0] ==
 665                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 666                 (card->ext_csd.raw_sectors[1] ==
 667                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 668                 (card->ext_csd.raw_sectors[2] ==
 669                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 670                 (card->ext_csd.raw_sectors[3] ==
 671                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 672                 (card->ext_csd.raw_pwr_cl_52_195 ==
 673                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 674                 (card->ext_csd.raw_pwr_cl_26_195 ==
 675                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 676                 (card->ext_csd.raw_pwr_cl_52_360 ==
 677                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 678                 (card->ext_csd.raw_pwr_cl_26_360 ==
 679                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 680                 (card->ext_csd.raw_pwr_cl_200_195 ==
 681                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 682                 (card->ext_csd.raw_pwr_cl_200_360 ==
 683                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 684                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 685                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 686                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 687                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 688                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 689                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 690
 691         if (err)
 692                 err = -EINVAL;
 693
 694 out:
 695         mmc_free_ext_csd(bw_ext_csd);
 696         return err;
 697 }
 698
 699 static ssize_t mmc_boot_info_show(struct device *dev,
 700                         struct device_attribute *attr, char *buf)
 701 {
 702         char *boot_partition[8] = {
 703                 "Device not boot enabled",
 704                 "Boot partition 1 enabled",
 705                 "Boot partition 2 enabled",
 706                 "Reserved",
 707                 "Reserved",
 708                 "Reserved",
 709                 "Reserved",
 710                 "User area enabled for boot"};
 711
 712         char *bus_width[4] = {
 713                 "x1 (sdr) or x4 (ddr) bus width in boot operation mode",
 714                 "x4 (sdr/ddr) bus width in boot operation mode",
 715                 "x8 (sdr/ddr) bus width in boot operation mode",
 716                 "Reserved"};
 717
 718         char *boot_mode[4] = {
 719         "Use single data rate + backward compatible timings in boot operation",
 720         "Use single data rate + high speed timings in boot operation mode",
 721         "Use dual data rate in boot operation",
 722         "Reserved"};
 723
 724         int partition;
 725         int width;
 726         int mode;
 727         int err;
 728         u8 *ext_csd = NULL;
 729         struct mmc_card *card = container_of(dev, struct mmc_card, dev);
 730
 731         /* read it again because user may change it */
 732         mmc_claim_host(card->host);
 733         err = mmc_get_ext_csd(card, &ext_csd);
 734         mmc_release_host(card->host);
 735         if (err || !ext_csd) {
 736                 pr_err("%s: failed to get ext_csd, err=%d\n",
 737                                 mmc_hostname(card->host),
 738                                 err);
 739                 return err;
 740         }
 741
 742         mmc_read_ext_csd(card, ext_csd);
 743         mmc_free_ext_csd(ext_csd);
 744
 745         partition = (card->ext_csd.boot_config >> 3) & 0x7;
 746         width =  card->ext_csd.boot_bus_width & 0x3;
 747         mode = (card->ext_csd.boot_bus_width >> 3) & 0x3;
 748
 749         return sprintf(buf,
 750                 "boot_info:0x%02x;\n"
 751                 "  ALT_BOOT_MODE:%x - %s\n"
 752                 "  DDR_BOOT_MODE:%x - %s\n"
 753                 "  HS_BOOTMODE:%x - %s\n"
 754                 "boot_size:%04dKB\n"
 755                 "boot_partition:0x%02x;\n"
 756                 "  BOOT_ACK:%x - %s\n"
 757                 "  BOOT_PARTITION-ENABLE: %x - %s\n"
 758                 "boot_bus:0x%02x\n"
 759                 "  BOOT_MODE:%x - %s\n"
 760                 "  RESET_BOOT_BUS_WIDTH:%x - %s\n"
 761                 "  BOOT_BUS_WIDTH:%x - %s\n",
 762
 763                 card->ext_csd.boot_info,
 764                 !!(card->ext_csd.boot_info & 0x1),
 765                 (card->ext_csd.boot_info & 0x1) ?
 766                         "Supports alternate boot method" :
 767                         "Does not support alternate boot method",
 768                 !!(card->ext_csd.boot_info & 0x2),
 769                 (card->ext_csd.boot_info & 0x2) ?
 770                         "Supports alternate dual data rate during boot" :
 771                         "Does not support dual data rate during boot",
 772                 !!(card->ext_csd.boot_info & 0x4),
 773                 (card->ext_csd.boot_info & 0x4) ?
 774                         "Supports high speed timing during boot" :
 775                         "Does not support high speed timing during boot",
 776
 777                 card->ext_csd.boot_size * 128,
 778
 779                 card->ext_csd.boot_config,
 780                 !!(card->ext_csd.boot_config & 0x40),
 781                 (card->ext_csd.boot_config & 0x40) ?
 782                         "Boot acknowledge sent during boot operation" :
 783                         "No boot acknowledge sent",
 784                 partition,
 785                 boot_partition[partition],
 786
 787                 card->ext_csd.boot_bus_width,
 788                 mode,
 789                 boot_mode[mode],
 790                 !!(card->ext_csd.boot_bus_width & 0x4),
 791                 (card->ext_csd.boot_bus_width & 0x4) ?
 792                   "Retain boot bus width and boot mode after boot operation" :
 793                   "Reset bus width to x1, single data rate and backward"
 794                   "compatible timings after boot operation",
 795                 width,
 796                 bus_width[width]);
 797 }
 798
 799 /* set up boot partitions */
 800 static ssize_t
 801 setup_boot_partitions(struct device *dev, struct device_attribute *attr,
 802                 const char *buf, size_t count)
 803 {
 804         int err, busy = 0;
 805         u32 part;
 806         u8 *ext_csd, boot_config;
 807         struct mmc_command cmd;
 808         struct mmc_card *card = container_of(dev, struct mmc_card, dev);
 809
 810         BUG_ON(!card);
 811
 812         sscanf(buf, "%d\n", &part);
 813
 814         if (card->csd.mmca_vsn < CSD_SPEC_VER_4) {
 815                 pr_err("%s: invalid mmc version" \
 816                         " mmc version is below version 4!)\n",
 817                         mmc_hostname(card->host));
 818                 return -EINVAL;
 819         }
 820
 821         /* it's a normal SD/MMC but user request to configure boot partition */
 822         if (card->ext_csd.boot_size <= 0) {
 823                 pr_err("%s: fail to send SWITCH command to card " \
 824                                 "to update boot_config of the EXT_CSD!\n",
 825                         mmc_hostname(card->host));
 826                 return -EINVAL;
 827         }
 828
 829         /*
 830          * partition must be -
 831          * 0 - user area
 832          * 1 - boot partition 1
 833          * 2 - boot partition 2
 834          * DO NOT switch the partitions that used to be accessed
 835          * in OS layer HERE
 836          */
 837         if (part & EXT_CSD_BOOT_PARTITION_ACCESS_MASK) {
 838                 pr_err("%s: DO NOT switch the partitions that used to be\n" \
 839                         " accessed in OS layer HERE. please following the\n" \
 840                         " guidance of Documentation/mmc/mmc-dev-parts.txt.\n",
 841                         mmc_hostname(card->host));
 842                 return -EINVAL;
 843        }
 844
 845         ext_csd = kmalloc(512, GFP_KERNEL);
 846         if (!ext_csd) {
 847                 pr_err("%s: could not allocate a buffer to " \
 848                         "receive the ext_csd.\n", mmc_hostname(card->host));
 849                 return -ENOMEM;
 850         }
 851
 852         mmc_claim_host(card->host);
 853         err = mmc_send_ext_csd(card, ext_csd);
 854         if (err) {
 855                 pr_err("%s: unable to read EXT_CSD.\n",
 856                         mmc_hostname(card->host));
 857                 goto err_rtn;
 858         }
 859
 860         /* enable the boot partition in boot mode */
 861         /* boot enable be -
 862          * 0x00 - disable boot enable.
 863          * 0x08 - boot partition 1 is enabled for boot.
 864          * 0x10 - boot partition 2 is enabled for boot.
 865          * 0x38 - User area is enabled for boot.
 866          */
 867         switch (part & EXT_CSD_BOOT_PARTITION_ENABLE_MASK) {
 868         case 0:
 869                 boot_config = (ext_csd[EXT_CSD_PART_CONFIG]
 870                                 & ~EXT_CSD_BOOT_PARTITION_ENABLE_MASK
 871                                 & ~EXT_CSD_BOOT_ACK_ENABLE);
 872                 break;
 873         case EXT_CSD_BOOT_PARTITION_PART1:
 874                 boot_config = ((ext_csd[EXT_CSD_PART_CONFIG]
 875                                 & ~EXT_CSD_BOOT_PARTITION_ENABLE_MASK)
 876                                 | EXT_CSD_BOOT_PARTITION_PART1
 877                                 | EXT_CSD_BOOT_ACK_ENABLE);
 878                 break;
 879         case EXT_CSD_BOOT_PARTITION_PART2:
 880                 boot_config = ((ext_csd[EXT_CSD_PART_CONFIG]
 881                                 & ~EXT_CSD_BOOT_PARTITION_ENABLE_MASK)
 882                                 | EXT_CSD_BOOT_PARTITION_PART2
 883                                 | EXT_CSD_BOOT_ACK_ENABLE);
 884                 break;
 885         case EXT_CSD_BOOT_PARTITION_ENABLE_MASK:
 886                 boot_config = ((ext_csd[EXT_CSD_PART_CONFIG]
 887                                 | EXT_CSD_BOOT_PARTITION_ENABLE_MASK)
 888                                 & ~EXT_CSD_BOOT_ACK_ENABLE);
 889                 break;
 890         default:
 891                 pr_err("%s: wrong boot config parameter" \
 892                         " 00 (disable boot), 08 (enable boot1)," \
 893                         "16 (enable boot2), 56 (User area)\n",
 894                         mmc_hostname(card->host));
 895                 err = -EINVAL;
 896                 goto err_rtn;
 897         }
 898
 899         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 900                 EXT_CSD_PART_CONFIG, boot_config, card->ext_csd.part_time);
 901         if (err) {
 902                 pr_err("%s: fail to send SWITCH command to card " \
 903                                 "to update boot_config of the EXT_CSD!\n",
 904                         mmc_hostname(card->host));
 905                 goto err_rtn;
 906         }
 907
 908         /* waiting for the card to finish the busy state */
 909         do {
 910                 memset(&cmd, 0, sizeof(struct mmc_command));
 911
 912                 cmd.opcode = MMC_SEND_STATUS;
 913                 cmd.arg = card->rca << 16;
 914                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 915
 916                 err = mmc_wait_for_cmd(card->host, &cmd, 0);
 917                 if (err || busy > 100) {
 918                         pr_err("%s: failed to wait for" \
 919                                 "the busy state to end.\n",
 920                                 mmc_hostname(card->host));
 921                         break;
 922                 }
 923
 924                 if (!busy && !(cmd.resp[0] & R1_READY_FOR_DATA)) {
 925                         pr_info("%s: card is in busy state" \
 926                                 "pls wait for busy state to end.\n",
 927                                 mmc_hostname(card->host));
 928                 }
 929                 busy++;
 930         } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
 931
 932         /* Now check whether it works */
 933         err = mmc_send_ext_csd(card, ext_csd);
 934         if (err) {
 935                 pr_err("%s: %d unable to re-read EXT_CSD.\n",
 936                         mmc_hostname(card->host), err);
 937                 goto err_rtn;
 938         }
 939
 940         card->ext_csd.boot_config = ext_csd[EXT_CSD_PART_CONFIG];
 941
 942 err_rtn:
 943         mmc_release_host(card->host);
 944         kfree(ext_csd);
 945         if (err)
 946                 return err;
 947         else
 948                 return count;
 949 }
 950
 951 /* configure the boot bus */
 952 static ssize_t
 953 setup_boot_bus(struct device *dev, struct device_attribute *attr,
 954                 const char *buf, size_t count)
 955 {
 956         int err, busy = 0;
 957         u32 boot_bus, new_bus;
 958         u8 *ext_csd;
 959         struct mmc_command cmd;
 960         struct mmc_card *card = container_of(dev, struct mmc_card, dev);
 961
 962         BUG_ON(!card);
 963
 964         sscanf(buf, "%d\n", &boot_bus);
 965
 966         if (card->csd.mmca_vsn < CSD_SPEC_VER_4) {
 967                 pr_err("%s: invalid mmc version" \
 968                         " mmc version is below version 4!)\n",
 969                         mmc_hostname(card->host));
 970                 return -EINVAL;
 971         }
 972
 973         /* it's a normal SD/MMC but user request to configure boot bus */
 974         if (card->ext_csd.boot_size <= 0) {
 975                 pr_err("%s: this is a normal SD/MMC card" \
 976                         " but you request to configure boot bus !\n",
 977                         mmc_hostname(card->host));
 978                 return -EINVAL;
 979         }
 980
 981         ext_csd = kmalloc(512, GFP_KERNEL);
 982         if (!ext_csd) {
 983                 pr_err("%s: could not allocate a buffer to " \
 984                         "receive the ext_csd.\n", mmc_hostname(card->host));
 985                 return -ENOMEM;
 986         }
 987
 988         mmc_claim_host(card->host);
 989         err = mmc_send_ext_csd(card, ext_csd);
 990         if (err) {
 991                 pr_err("%s: unable to read EXT_CSD.\n",
 992                         mmc_hostname(card->host));
 993                 goto err_rtn;
 994         }
 995
 996         /* Configure the boot bus width when boot partition is enabled */
 997         if (((boot_bus & EXT_CSD_BOOT_BUS_WIDTH_MODE_MASK) >> 3) > 2
 998                         || (boot_bus & EXT_CSD_BOOT_BUS_WIDTH_WIDTH_MASK) > 2
 999                         || (boot_bus & ~EXT_CSD_BOOT_BUS_WIDTH_MASK) > 0) {
1000                 pr_err("%s: Invalid inputs!\n",
1001                         mmc_hostname(card->host));
1002                 err = -EINVAL;
1003                 goto err_rtn;
1004         }
1005
1006         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1007                 EXT_CSD_BOOT_BUS_WIDTH, boot_bus, card->ext_csd.part_time);
1008         if (err) {
1009                 pr_err("%s: fail to send SWITCH command to card " \
1010                                 "to update boot_config of the EXT_CSD!\n",
1011                         mmc_hostname(card->host));
1012                 goto err_rtn;
1013         }
1014
1015         /* waiting for the card to finish the busy state */
1016         do {
1017                 memset(&cmd, 0, sizeof(struct mmc_command));
1018
1019                 cmd.opcode = MMC_SEND_STATUS;
1020                 cmd.arg = card->rca << 16;
1021                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1022
1023                 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1024                 if (err || busy > 100) {
1025                         pr_err("%s: failed to wait for" \
1026                                 "the busy state to end.\n",
1027                                 mmc_hostname(card->host));
1028                         break;
1029                 }
1030
1031                 if (!busy && !(cmd.resp[0] & R1_READY_FOR_DATA)) {
1032                         pr_info("%s: card is in busy state" \
1033                                 "pls wait for busy state to end.\n",
1034                                 mmc_hostname(card->host));
1035                 }
1036                 busy++;
1037         } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
1038
1039         /* Now check whether it works */
1040         err = mmc_send_ext_csd(card, ext_csd);
1041         if (err) {
1042                 pr_err("%s: %d unable to re-read EXT_CSD.\n",
1043                         mmc_hostname(card->host), err);
1044                 goto err_rtn;
1045         }
1046
1047         new_bus = ext_csd[EXT_CSD_BOOT_BUS_WIDTH];
1048         if (boot_bus  != new_bus) {
1049                 pr_err("%s: after SWITCH, current boot bus mode %d" \
1050                                 " is not same as requested bus mode %d!\n",
1051                         mmc_hostname(card->host), new_bus, boot_bus);
1052                 goto err_rtn;
1053         }
1054         card->ext_csd.boot_bus_width = ext_csd[EXT_CSD_BOOT_BUS_WIDTH];
1055
1056 err_rtn:
1057         mmc_release_host(card->host);
1058         mmc_free_ext_csd(ext_csd);
1059         if (err)
1060                 return err;
1061         else
1062                 return count;
1063 }
1064
1065 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
1066         card->raw_cid[2], card->raw_cid[3]);
1067 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
1068         card->raw_csd[2], card->raw_csd[3]);
1069 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
1070 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
1071 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
1072 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
1073 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
1074 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
1075 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
1076 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
1077 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
1078 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
1079 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
1080                 card->ext_csd.enhanced_area_offset);
1081 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
1082 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
1083 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
1084 DEVICE_ATTR(boot_info, S_IRUGO, mmc_boot_info_show, NULL);
1085 DEVICE_ATTR(boot_config, S_IWUGO, NULL, setup_boot_partitions);
1086 DEVICE_ATTR(boot_bus_config, S_IWUGO, NULL, setup_boot_bus);
1087
1088 static struct attribute *mmc_std_attrs[] = {
1089         &dev_attr_cid.attr,
1090         &dev_attr_csd.attr,
1091         &dev_attr_date.attr,
1092         &dev_attr_erase_size.attr,
1093         &dev_attr_preferred_erase_size.attr,
1094         &dev_attr_fwrev.attr,
1095         &dev_attr_hwrev.attr,
1096         &dev_attr_manfid.attr,
1097         &dev_attr_name.attr,
1098         &dev_attr_oemid.attr,
1099         &dev_attr_prv.attr,
1100         &dev_attr_serial.attr,
1101         &dev_attr_enhanced_area_offset.attr,
1102         &dev_attr_enhanced_area_size.attr,
1103         &dev_attr_raw_rpmb_size_mult.attr,
1104         &dev_attr_rel_sectors.attr,
1105         &dev_attr_boot_info.attr,
1106         &dev_attr_boot_config.attr,
1107         &dev_attr_boot_bus_config.attr,
1108         NULL,
1109 };
1110 ATTRIBUTE_GROUPS(mmc_std);
1111
1112 static struct device_type mmc_type = {
1113         .groups = mmc_std_groups,
1114 };
1115
1116 /*
1117  * Select the PowerClass for the current bus width
1118  * If power class is defined for 4/8 bit bus in the
1119  * extended CSD register, select it by executing the
1120  * mmc_switch command.
1121  */
1122 static int __mmc_select_powerclass(struct mmc_card *card,
1123                                    unsigned int bus_width)
1124 {
1125         struct mmc_host *host = card->host;
1126         struct mmc_ext_csd *ext_csd = &card->ext_csd;
1127         unsigned int pwrclass_val = 0;
1128         int err = 0;
1129
1130         /* Power class selection is supported for versions >= 4.0 */
1131         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
1132                 return 0;
1133
1134         /* Power class values are defined only for 4/8 bit bus */
1135         if (bus_width == EXT_CSD_BUS_WIDTH_1)
1136                 return 0;
1137
1138         switch (1 << host->ios.vdd) {
1139         case MMC_VDD_165_195:
1140                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
1141                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
1142                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
1143                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
1144                                 ext_csd->raw_pwr_cl_52_195 :
1145                                 ext_csd->raw_pwr_cl_ddr_52_195;
1146                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
1147                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
1148                 break;
1149         case MMC_VDD_27_28:
1150         case MMC_VDD_28_29:
1151         case MMC_VDD_29_30:
1152         case MMC_VDD_30_31:
1153         case MMC_VDD_31_32:
1154         case MMC_VDD_32_33:
1155         case MMC_VDD_33_34:
1156         case MMC_VDD_34_35:
1157         case MMC_VDD_35_36:
1158                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
1159                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
1160                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
1161                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
1162                                 ext_csd->raw_pwr_cl_52_360 :
1163                                 ext_csd->raw_pwr_cl_ddr_52_360;
1164                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
1165                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
1166                                 ext_csd->raw_pwr_cl_ddr_200_360 :
1167                                 ext_csd->raw_pwr_cl_200_360;
1168                 break;
1169         default:
1170                 pr_warning("%s: Voltage range not supported "
1171                            "for power class.\n", mmc_hostname(host));
1172                 return -EINVAL;
1173         }
1174
1175         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
1176                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
1177                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
1178         else
1179                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
1180                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
1181
1182         /* If the power class is different from the default value */
1183         if (pwrclass_val > 0) {
1184                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1185                                  EXT_CSD_POWER_CLASS,
1186                                  pwrclass_val,
1187                                  card->ext_csd.generic_cmd6_time);
1188         }
1189
1190         return err;
1191 }
1192
1193 static int mmc_select_powerclass(struct mmc_card *card)
1194 {
1195         struct mmc_host *host = card->host;
1196         u32 bus_width, ext_csd_bits;
1197         int err, ddr;
1198
1199         /* Power class selection is supported for versions >= 4.0 */
1200         if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
1201                 return 0;
1202
1203         bus_width = host->ios.bus_width;
1204         /* Power class values are defined only for 4/8 bit bus */
1205         if (bus_width == MMC_BUS_WIDTH_1)
1206                 return 0;
1207
1208         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
1209         if (ddr)
1210                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1211                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1212         else
1213                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1214                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
1215
1216         err = __mmc_select_powerclass(card, ext_csd_bits);
1217         if (err)
1218                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
1219                         mmc_hostname(host), 1 << bus_width, ddr);
1220
1221         return err;
1222 }
1223
1224 /*
1225  * Set the bus speed for the selected speed mode.
1226  */
1227 static void mmc_set_bus_speed(struct mmc_card *card)
1228 {
1229         unsigned int max_dtr = (unsigned int)-1;
1230
1231         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
1232              max_dtr > card->ext_csd.hs200_max_dtr)
1233                 max_dtr = card->ext_csd.hs200_max_dtr;
1234         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
1235                 max_dtr = card->ext_csd.hs_max_dtr;
1236         else if (max_dtr > card->csd.max_dtr)
1237                 max_dtr = card->csd.max_dtr;
1238
1239         mmc_set_clock(card->host, max_dtr);
1240 }
1241
1242 /*
1243  * Select the bus width amoung 4-bit and 8-bit(SDR).
1244  * If the bus width is changed successfully, return the selected width value.
1245  * Zero is returned instead of error value if the wide width is not supported.
1246  */
1247 static int mmc_select_bus_width(struct mmc_card *card)
1248 {
1249         static unsigned ext_csd_bits[] = {
1250                 EXT_CSD_BUS_WIDTH_8,
1251                 EXT_CSD_BUS_WIDTH_4,
1252         };
1253         static unsigned bus_widths[] = {
1254                 MMC_BUS_WIDTH_8,
1255                 MMC_BUS_WIDTH_4,
1256         };
1257         struct mmc_host *host = card->host;
1258         unsigned idx, bus_width = 0;
1259         int err = 0;
1260
1261         if ((card->csd.mmca_vsn < CSD_SPEC_VER_4) &&
1262             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
1263                 return 0;
1264
1265         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
1266
1267         /*
1268          * Unlike SD, MMC cards dont have a configuration register to notify
1269          * supported bus width. So bus test command should be run to identify
1270          * the supported bus width or compare the ext csd values of current
1271          * bus width and ext csd values of 1 bit mode read earlier.
1272          */
1273         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1274                 /*
1275                  * Host is capable of 8bit transfer, then switch
1276                  * the device to work in 8bit transfer mode. If the
1277                  * mmc switch command returns error then switch to
1278                  * 4bit transfer mode. On success set the corresponding
1279                  * bus width on the host.
1280                  */
1281                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1282                                  EXT_CSD_BUS_WIDTH,
1283                                  ext_csd_bits[idx],
1284                                  card->ext_csd.generic_cmd6_time);
1285                 if (err)
1286                         continue;
1287
1288                 bus_width = bus_widths[idx];
1289                 mmc_set_bus_width(host, bus_width);
1290
1291                 /*
1292                  * If controller can't handle bus width test,
1293                  * compare ext_csd previously read in 1 bit mode
1294                  * against ext_csd at new bus width
1295                  */
1296                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1297                         err = mmc_compare_ext_csds(card, bus_width);
1298                 else
1299                         err = mmc_bus_test(card, bus_width);
1300
1301                 if (!err) {
1302                         err = bus_width;
1303                         break;
1304                 } else {
1305                         pr_warn("%s: switch to bus width %d failed\n",
1306                                 mmc_hostname(host), ext_csd_bits[idx]);
1307                 }
1308         }
1309
1310         return err;
1311 }
1312
1313 /*
1314  * Switch to the high-speed mode
1315  */
1316 static int mmc_select_hs(struct mmc_card *card)
1317 {
1318         int err;
1319
1320         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1321                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1322                            card->ext_csd.generic_cmd6_time,
1323                            true, true, true);
1324         if (!err)
1325                 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1326
1327         return err;
1328 }
1329
1330 /*
1331  * Activate wide bus and DDR if supported.
1332  */
1333 static int mmc_select_hs_ddr(struct mmc_card *card)
1334 {
1335         struct mmc_host *host = card->host;
1336         u32 bus_width, ext_csd_bits;
1337         int err = 0;
1338
1339         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1340                 return 0;
1341
1342         bus_width = host->ios.bus_width;
1343         if (bus_width == MMC_BUS_WIDTH_1)
1344                 return 0;
1345
1346         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1347                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1348
1349         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1350                         EXT_CSD_BUS_WIDTH,
1351                         ext_csd_bits,
1352                         card->ext_csd.generic_cmd6_time);
1353         if (err) {
1354                 pr_warn("%s: switch to bus width %d ddr failed\n",
1355                         mmc_hostname(host), 1 << bus_width);
1356                 return err;
1357         }
1358
1359         /*
1360          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1361          * signaling.
1362          *
1363          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1364          *
1365          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1366          * in the JEDEC spec for DDR.
1367          *
1368          * Do not force change in vccq since we are obviously
1369          * working and no change to vccq is needed.
1370          *
1371          * WARNING: eMMC rules are NOT the same as SD DDR
1372          */
1373         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
1374                 err = __mmc_set_signal_voltage(host,
1375                                 MMC_SIGNAL_VOLTAGE_120);
1376                 if (err)
1377                         return err;
1378         }
1379
1380         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1381
1382         return err;
1383 }
1384
1385 static int mmc_select_hs400(struct mmc_card *card)
1386 {
1387         struct mmc_host *host = card->host;
1388         int err = 0;
1389
1390         /*
1391          * HS400 mode requires 8-bit bus width
1392          */
1393         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1394               host->ios.bus_width == MMC_BUS_WIDTH_8))
1395                 return 0;
1396
1397         /*
1398          * Before switching to dual data rate operation for HS400,
1399          * it is required to convert from HS200 mode to HS mode.
1400          */
1401         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1402         mmc_set_bus_speed(card);
1403
1404         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1405                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1406                            card->ext_csd.generic_cmd6_time,
1407                            true, true, true);
1408         if (err) {
1409                 pr_warn("%s: switch to high-speed from hs200 failed, err:%d\n",
1410                         mmc_hostname(host), err);
1411                 return err;
1412         }
1413
1414         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1415                          EXT_CSD_BUS_WIDTH,
1416                          EXT_CSD_DDR_BUS_WIDTH_8,
1417                          card->ext_csd.generic_cmd6_time);
1418         if (err) {
1419                 pr_warn("%s: switch to bus width for hs400 failed, err:%d\n",
1420                         mmc_hostname(host), err);
1421                 return err;
1422         }
1423
1424         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1425                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS400,
1426                            card->ext_csd.generic_cmd6_time,
1427                            true, true, true);
1428         if (err) {
1429                 pr_warn("%s: switch to hs400 failed, err:%d\n",
1430                          mmc_hostname(host), err);
1431                 return err;
1432         }
1433
1434         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1435         mmc_set_bus_speed(card);
1436
1437         return 0;
1438 }
1439
1440 /*
1441  * For device supporting HS200 mode, the following sequence
1442  * should be done before executing the tuning process.
1443  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1444  * 2. switch to HS200 mode
1445  * 3. set the clock to > 52Mhz and <=200MHz
1446  */
1447 static int mmc_select_hs200(struct mmc_card *card)
1448 {
1449         struct mmc_host *host = card->host;
1450         int err = -EINVAL;
1451
1452         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1453                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1454
1455         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1456                 err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1457
1458         /* If fails try again during next card power cycle */
1459         if (err)
1460                 goto err;
1461
1462         /*
1463          * Set the bus width(4 or 8) with host's support and
1464          * switch to HS200 mode if bus width is set successfully.
1465          */
1466         err = mmc_select_bus_width(card);
1467         if (!IS_ERR_VALUE(err)) {
1468                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1469                                    EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS200,
1470                                    card->ext_csd.generic_cmd6_time,
1471                                    true, true, true);
1472                 if (!err)
1473                         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1474         }
1475 err:
1476         return err;
1477 }
1478
1479 /*
1480  * Activate High Speed or HS200 mode if supported.
1481  */
1482 static int mmc_select_timing(struct mmc_card *card)
1483 {
1484         int err = 0;
1485
1486         if ((card->csd.mmca_vsn < CSD_SPEC_VER_4 &&
1487              card->ext_csd.hs_max_dtr == 0))
1488                 goto bus_speed;
1489
1490         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1491                 err = mmc_select_hs200(card);
1492         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1493                 err = mmc_select_hs(card);
1494
1495         if (err && err != -EBADMSG)
1496                 return err;
1497
1498         if (err) {
1499                 pr_warn("%s: switch to %s failed\n",
1500                         mmc_card_hs(card) ? "high-speed" :
1501                         (mmc_card_hs200(card) ? "hs200" : ""),
1502                         mmc_hostname(card->host));
1503                 err = 0;
1504         }
1505
1506 bus_speed:
1507         /*
1508          * Set the bus speed to the selected bus timing.
1509          * If timing is not selected, backward compatible is the default.
1510          */
1511         mmc_set_bus_speed(card);
1512         return err;
1513 }
1514
1515 /*
1516  * Execute tuning sequence to seek the proper bus operating
1517  * conditions for HS200 and HS400, which sends CMD21 to the device.
1518  */
1519 static int mmc_hs200_tuning(struct mmc_card *card)
1520 {
1521         struct mmc_host *host = card->host;
1522         int err = 0;
1523
1524         /*
1525          * Timing should be adjusted to the HS400 target
1526          * operation frequency for tuning process
1527          */
1528         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1529             host->ios.bus_width == MMC_BUS_WIDTH_8)
1530                 if (host->ops->prepare_hs400_tuning)
1531                         host->ops->prepare_hs400_tuning(host, &host->ios);
1532
1533         if (host->ops->execute_tuning) {
1534                 mmc_host_clk_hold(host);
1535                 err = host->ops->execute_tuning(host,
1536                                 MMC_SEND_TUNING_BLOCK_HS200);
1537                 mmc_host_clk_release(host);
1538
1539                 if (err)
1540                         pr_warn("%s: tuning execution failed\n",
1541                                 mmc_hostname(host));
1542         }
1543
1544         return err;
1545 }
1546
1547 /*
1548  * Handle the detection and initialisation of a card.
1549  *
1550  * In the case of a resume, "oldcard" will contain the card
1551  * we're trying to reinitialise.
1552  */
1553 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1554         struct mmc_card *oldcard)
1555 {
1556         struct mmc_card *card;
1557         int err;
1558         u32 cid[4];
1559         u32 rocr;
1560         u8 *ext_csd = NULL;
1561
1562         BUG_ON(!host);
1563         WARN_ON(!host->claimed);
1564
1565         /* Set correct bus mode for MMC before attempting init */
1566         if (!mmc_host_is_spi(host))
1567                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1568
1569         /*
1570          * Since we're changing the OCR value, we seem to
1571          * need to tell some cards to go back to the idle
1572          * state.  We wait 1ms to give cards time to
1573          * respond.
1574          * mmc_go_idle is needed for eMMC that are asleep
1575          */
1576         mmc_go_idle(host);
1577
1578         /* The extra bit indicates that we support high capacity */
1579         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1580         if (err)
1581                 goto err;
1582
1583         /*
1584          * For SPI, enable CRC as appropriate.
1585          */
1586         if (mmc_host_is_spi(host)) {
1587                 err = mmc_spi_set_crc(host, use_spi_crc);
1588                 if (err)
1589                         goto err;
1590         }
1591
1592         /*
1593          * Fetch CID from card.
1594          */
1595         if (mmc_host_is_spi(host))
1596                 err = mmc_send_cid(host, cid);
1597         else
1598                 err = mmc_all_send_cid(host, cid);
1599         if (err)
1600                 goto err;
1601
1602         if (oldcard) {
1603                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1604                         err = -ENOENT;
1605                         goto err;
1606                 }
1607
1608                 card = oldcard;
1609         } else {
1610                 /*
1611                  * Allocate card structure.
1612                  */
1613                 card = mmc_alloc_card(host, &mmc_type);
1614                 if (IS_ERR(card)) {
1615                         err = PTR_ERR(card);
1616                         goto err;
1617                 }
1618
1619                 card->ocr = ocr;
1620                 card->type = MMC_TYPE_MMC;
1621                 card->rca = 1;
1622                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1623         }
1624
1625         /*
1626          * For native busses:  set card RCA and quit open drain mode.
1627          */
1628         if (!mmc_host_is_spi(host)) {
1629                 err = mmc_set_relative_addr(card);
1630                 if (err)
1631                         goto free_card;
1632
1633                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1634         }
1635
1636         if (!oldcard) {
1637                 /*
1638                  * Fetch CSD from card.
1639                  */
1640                 err = mmc_send_csd(card, card->raw_csd);
1641                 if (err)
1642                         goto free_card;
1643
1644                 err = mmc_decode_csd(card);
1645                 if (err)
1646                         goto free_card;
1647                 err = mmc_decode_cid(card);
1648                 if (err)
1649                         goto free_card;
1650         }
1651
1652         /*
1653          * Select card, as all following commands rely on that.
1654          */
1655         if (!mmc_host_is_spi(host)) {
1656                 err = mmc_select_card(card);
1657                 if (err)
1658                         goto free_card;
1659         }
1660
1661         if (!oldcard) {
1662                 /*
1663                  * Fetch and process extended CSD.
1664                  */
1665
1666                 err = mmc_get_ext_csd(card, &ext_csd);
1667                 if (err)
1668                         goto free_card;
1669                 err = mmc_read_ext_csd(card, ext_csd);
1670                 if (err)
1671                         goto free_card;
1672
1673                 /* If doing byte addressing, check if required to do sector
1674                  * addressing.  Handle the case of <2GB cards needing sector
1675                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1676                  * ocr register has bit 30 set for sector addressing.
1677                  */
1678                 if (!(mmc_card_blockaddr(card)) && (rocr & (1<<30)))
1679                         mmc_card_set_blockaddr(card);
1680
1681                 /* Erase size depends on CSD and Extended CSD */
1682                 mmc_set_erase_size(card);
1683         }
1684
1685         /*
1686          * If enhanced_area_en is TRUE, host needs to enable ERASE_GRP_DEF
1687          * bit.  This bit will be lost every time after a reset or power off.
1688          */
1689         if (card->ext_csd.enhanced_area_en ||
1690             (card->ext_csd.rev >= 3 && (host->caps2 & MMC_CAP2_HC_ERASE_SZ))) {
1691                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1692                                  EXT_CSD_ERASE_GROUP_DEF, 1,
1693                                  card->ext_csd.generic_cmd6_time);
1694
1695                 if (err && err != -EBADMSG)
1696                         goto free_card;
1697
1698                 if (err) {
1699                         err = 0;
1700                         /*
1701                          * Just disable enhanced area off & sz
1702                          * will try to enable ERASE_GROUP_DEF
1703                          * during next time reinit
1704                          */
1705                         card->ext_csd.enhanced_area_offset = -EINVAL;
1706                         card->ext_csd.enhanced_area_size = -EINVAL;
1707                 } else {
1708                         card->ext_csd.erase_group_def = 1;
1709                         /*
1710                          * enable ERASE_GRP_DEF successfully.
1711                          * This will affect the erase size, so
1712                          * here need to reset erase size
1713                          */
1714                         mmc_set_erase_size(card);
1715                 }
1716         }
1717
1718         /*
1719          * Ensure eMMC user default partition is enabled
1720          */
1721         if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
1722                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
1723                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
1724                                  card->ext_csd.part_config,
1725                                  card->ext_csd.part_time);
1726                 if (err && err != -EBADMSG)
1727                         goto free_card;
1728         }
1729
1730         /*
1731          * Enable power_off_notification byte in the ext_csd register
1732          */
1733         if (card->ext_csd.rev >= 6) {
1734                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1735                                  EXT_CSD_POWER_OFF_NOTIFICATION,
1736                                  EXT_CSD_POWER_ON,
1737                                  card->ext_csd.generic_cmd6_time);
1738                 if (err && err != -EBADMSG)
1739                         goto free_card;
1740
1741                 /*
1742                  * The err can be -EBADMSG or 0,
1743                  * so check for success and update the flag
1744                  */
1745                 if (!err)
1746                         card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
1747         }
1748
1749         /*
1750          * Select timing interface
1751          */
1752         err = mmc_select_timing(card);
1753         if (err)
1754                 goto free_card;
1755
1756         if (mmc_card_hs200(card)) {
1757                 err = mmc_hs200_tuning(card);
1758                 if (err)
1759                         goto err;
1760
1761                 err = mmc_select_hs400(card);
1762                 if (err)
1763                         goto err;
1764         } else if (mmc_card_hs(card)) {
1765                 /* Select the desired bus width optionally */
1766                 err = mmc_select_bus_width(card);
1767                 if (!IS_ERR_VALUE(err)) {
1768                         err = mmc_select_hs_ddr(card);
1769                         if (err)
1770                                 goto err;
1771                 }
1772         }
1773
1774         /*
1775          * Choose the power class with selected bus interface
1776          */
1777         mmc_select_powerclass(card);
1778
1779         /*
1780          * Enable HPI feature (if supported)
1781          */
1782         if (card->ext_csd.hpi) {
1783                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1784                                 EXT_CSD_HPI_MGMT, 1,
1785                                 card->ext_csd.generic_cmd6_time);
1786                 if (err && err != -EBADMSG)
1787                         goto free_card;
1788                 if (err) {
1789                         pr_warning("%s: Enabling HPI failed\n",
1790                                    mmc_hostname(card->host));
1791                         err = 0;
1792                 } else
1793                         card->ext_csd.hpi_en = 1;
1794         }
1795
1796         /*
1797          * If cache size is higher than 0, this indicates
1798          * the existence of cache and it can be turned on.
1799          */
1800         if (card->ext_csd.cache_size > 0) {
1801                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1802                                 EXT_CSD_CACHE_CTRL, 1,
1803                                 card->ext_csd.generic_cmd6_time);
1804                 if (err && err != -EBADMSG)
1805                         goto free_card;
1806
1807                 /*
1808                  * Only if no error, cache is turned on successfully.
1809                  */
1810                 if (err) {
1811                         pr_warning("%s: Cache is supported, "
1812                                         "but failed to turn on (%d)\n",
1813                                         mmc_hostname(card->host), err);
1814                         card->ext_csd.cache_ctrl = 0;
1815                         err = 0;
1816                 } else {
1817                         card->ext_csd.cache_ctrl = 1;
1818                 }
1819         }
1820
1821         /*
1822          * The mandatory minimum values are defined for packed command.
1823          * read: 5, write: 3
1824          */
1825         if (card->ext_csd.max_packed_writes >= 3 &&
1826             card->ext_csd.max_packed_reads >= 5 &&
1827             host->caps2 & MMC_CAP2_PACKED_CMD) {
1828                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1829                                 EXT_CSD_EXP_EVENTS_CTRL,
1830                                 EXT_CSD_PACKED_EVENT_EN,
1831                                 card->ext_csd.generic_cmd6_time);
1832                 if (err && err != -EBADMSG)
1833                         goto free_card;
1834                 if (err) {
1835                         pr_warn("%s: Enabling packed event failed\n",
1836                                 mmc_hostname(card->host));
1837                         card->ext_csd.packed_event_en = 0;
1838                         err = 0;
1839                 } else {
1840                         card->ext_csd.packed_event_en = 1;
1841                 }
1842         }
1843
1844         if (!oldcard)
1845                 host->card = card;
1846
1847         mmc_free_ext_csd(ext_csd);
1848         return 0;
1849
1850 free_card:
1851         if (!oldcard)
1852                 mmc_remove_card(card);
1853 err:
1854         mmc_free_ext_csd(ext_csd);
1855
1856         return err;
1857 }
1858
1859 static int mmc_can_sleep(struct mmc_card *card)
1860 {
1861         return (card && card->ext_csd.rev >= 3);
1862 }
1863
1864 static int mmc_sleep(struct mmc_host *host)
1865 {
1866         struct mmc_command cmd = {0};
1867         struct mmc_card *card = host->card;
1868         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1869         int err;
1870
1871         err = mmc_deselect_cards(host);
1872         if (err)
1873                 return err;
1874
1875         cmd.opcode = MMC_SLEEP_AWAKE;
1876         cmd.arg = card->rca << 16;
1877         cmd.arg |= 1 << 15;
1878
1879         /*
1880          * If the max_busy_timeout of the host is specified, validate it against
1881          * the sleep cmd timeout. A failure means we need to prevent the host
1882          * from doing hw busy detection, which is done by converting to a R1
1883          * response instead of a R1B.
1884          */
1885         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
1886                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1887         } else {
1888                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1889                 cmd.busy_timeout = timeout_ms;
1890         }
1891
1892         err = mmc_wait_for_cmd(host, &cmd, 0);
1893         if (err)
1894                 return err;
1895
1896         /*
1897          * If the host does not wait while the card signals busy, then we will
1898          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1899          * SEND_STATUS command to poll the status because that command (and most
1900          * others) is invalid while the card sleeps.
1901          */
1902         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1903                 mmc_delay(timeout_ms);
1904
1905         return err;
1906 }
1907
1908 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1909 {
1910         return card &&
1911                 mmc_card_mmc(card) &&
1912                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1913 }
1914
1915 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1916 {
1917         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1918         int err;
1919
1920         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1921         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1922                 timeout = card->ext_csd.power_off_longtime;
1923
1924         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1925                         EXT_CSD_POWER_OFF_NOTIFICATION,
1926                         notify_type, timeout, true, false, false);
1927         if (err)
1928                 pr_err("%s: Power Off Notification timed out, %u\n",
1929                        mmc_hostname(card->host), timeout);
1930
1931         /* Disable the power off notification after the switch operation. */
1932         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1933
1934         return err;
1935 }
1936
1937 /*
1938  * Host is being removed. Free up the current card.
1939  */
1940 static void mmc_remove(struct mmc_host *host)
1941 {
1942         BUG_ON(!host);
1943         BUG_ON(!host->card);
1944
1945         mmc_remove_card(host->card);
1946         host->card = NULL;
1947 }
1948
1949 /*
1950  * Card detection - card is alive.
1951  */
1952 static int mmc_alive(struct mmc_host *host)
1953 {
1954         return mmc_send_status(host->card, NULL);
1955 }
1956
1957 /*
1958  * Card detection callback from host.
1959  */
1960 static void mmc_detect(struct mmc_host *host)
1961 {
1962         int err;
1963
1964         BUG_ON(!host);
1965         BUG_ON(!host->card);
1966
1967         mmc_get_card(host->card);
1968
1969         /*
1970          * Just check if our card has been removed.
1971          */
1972         err = _mmc_detect_card_removed(host);
1973
1974         mmc_put_card(host->card);
1975
1976         if (err) {
1977                 mmc_remove(host);
1978
1979                 mmc_claim_host(host);
1980                 mmc_detach_bus(host);
1981                 mmc_power_off(host);
1982                 mmc_release_host(host);
1983         }
1984 }
1985
1986 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
1987 {
1988         int err = 0;
1989         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
1990                                         EXT_CSD_POWER_OFF_LONG;
1991
1992         BUG_ON(!host);
1993         BUG_ON(!host->card);
1994
1995         mmc_claim_host(host);
1996
1997         if (mmc_card_suspended(host->card))
1998                 goto out;
1999
2000         if (mmc_card_doing_bkops(host->card)) {
2001                 err = mmc_stop_bkops(host->card);
2002                 if (err)
2003                         goto out;
2004         }
2005
2006         err = mmc_flush_cache(host->card);
2007         if (err)
2008                 goto out;
2009
2010         if (mmc_can_poweroff_notify(host->card) &&
2011                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
2012                 err = mmc_poweroff_notify(host->card, notify_type);
2013         else if (mmc_can_sleep(host->card))
2014                 err = mmc_sleep(host);
2015         else if (!mmc_host_is_spi(host))
2016                 err = mmc_deselect_cards(host);
2017
2018         if (!err) {
2019                 mmc_power_off(host);
2020                 mmc_card_set_suspended(host->card);
2021         }
2022 out:
2023         mmc_release_host(host);
2024         return err;
2025 }
2026
2027 /*
2028  * Suspend callback
2029  */
2030 static int mmc_suspend(struct mmc_host *host)
2031 {
2032         int err;
2033
2034         err = _mmc_suspend(host, true);
2035         if (!err) {
2036                 pm_runtime_disable(&host->card->dev);
2037                 pm_runtime_set_suspended(&host->card->dev);
2038         }
2039
2040         return err;
2041 }
2042
2043 /*
2044  * This function tries to determine if the same card is still present
2045  * and, if so, restore all state to it.
2046  */
2047 static int _mmc_resume(struct mmc_host *host)
2048 {
2049         int err = 0;
2050
2051         BUG_ON(!host);
2052         BUG_ON(!host->card);
2053
2054         mmc_claim_host(host);
2055
2056         if (!mmc_card_suspended(host->card))
2057                 goto out;
2058
2059         mmc_power_up(host, host->card->ocr);
2060         err = mmc_init_card(host, host->card->ocr, host->card);
2061         mmc_card_clr_suspended(host->card);
2062
2063 out:
2064         mmc_release_host(host);
2065         return err;
2066 }
2067
2068 /*
2069  * Shutdown callback
2070  */
2071 static int mmc_shutdown(struct mmc_host *host)
2072 {
2073         int err = 0;
2074
2075         /*
2076          * In a specific case for poweroff notify, we need to resume the card
2077          * before we can shutdown it properly.
2078          */
2079         if (mmc_can_poweroff_notify(host->card) &&
2080                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2081                 err = _mmc_resume(host);
2082
2083         if (!err)
2084                 err = _mmc_suspend(host, false);
2085
2086         return err;
2087 }
2088
2089 /*
2090  * Callback for resume.
2091  */
2092 static int mmc_resume(struct mmc_host *host)
2093 {
2094         int err = 0;
2095
2096         if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) {
2097                 err = _mmc_resume(host);
2098                 pm_runtime_set_active(&host->card->dev);
2099                 pm_runtime_mark_last_busy(&host->card->dev);
2100         }
2101         pm_runtime_enable(&host->card->dev);
2102
2103         return err;
2104 }
2105
2106 /*
2107  * Callback for runtime_suspend.
2108  */
2109 static int mmc_runtime_suspend(struct mmc_host *host)
2110 {
2111         int err;
2112
2113         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2114                 return 0;
2115
2116         err = _mmc_suspend(host, true);
2117         if (err)
2118                 pr_err("%s: error %d doing aggessive suspend\n",
2119                         mmc_hostname(host), err);
2120
2121         return err;
2122 }
2123
2124 /*
2125  * Callback for runtime_resume.
2126  */
2127 static int mmc_runtime_resume(struct mmc_host *host)
2128 {
2129         int err;
2130
2131         if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
2132                 return 0;
2133
2134         err = _mmc_resume(host);
2135         if (err)
2136                 pr_err("%s: error %d doing aggessive resume\n",
2137                         mmc_hostname(host), err);
2138
2139         return 0;
2140 }
2141
2142 static int mmc_power_restore(struct mmc_host *host)
2143 {
2144         int ret;
2145
2146         mmc_claim_host(host);
2147         ret = mmc_init_card(host, host->card->ocr, host->card);
2148         mmc_release_host(host);
2149
2150         return ret;
2151 }
2152
2153 static const struct mmc_bus_ops mmc_ops = {
2154         .remove = mmc_remove,
2155         .detect = mmc_detect,
2156         .suspend = mmc_suspend,
2157         .resume = mmc_resume,
2158         .runtime_suspend = mmc_runtime_suspend,
2159         .runtime_resume = mmc_runtime_resume,
2160         .power_restore = mmc_power_restore,
2161         .alive = mmc_alive,
2162         .shutdown = mmc_shutdown,
2163 };
2164
2165 /*
2166  * Starting point for MMC card init.
2167  */
2168 int mmc_attach_mmc(struct mmc_host *host)
2169 {
2170         int err;
2171         u32 ocr, rocr;
2172
2173         BUG_ON(!host);
2174         WARN_ON(!host->claimed);
2175
2176         /* Set correct bus mode for MMC before attempting attach */
2177         if (!mmc_host_is_spi(host))
2178                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2179
2180         err = mmc_send_op_cond(host, 0, &ocr);
2181         if (err)
2182                 return err;
2183
2184         mmc_attach_bus(host, &mmc_ops);
2185         if (host->ocr_avail_mmc)
2186                 host->ocr_avail = host->ocr_avail_mmc;
2187
2188         /*
2189          * We need to get OCR a different way for SPI.
2190          */
2191         if (mmc_host_is_spi(host)) {
2192                 err = mmc_spi_read_ocr(host, 1, &ocr);
2193                 if (err)
2194                         goto err;
2195         }
2196
2197         rocr = mmc_select_voltage(host, ocr);
2198
2199         /*
2200          * Can we support the voltage of the card?
2201          */
2202         if (!rocr) {
2203                 err = -EINVAL;
2204                 goto err;
2205         }
2206
2207         /*
2208          * Detect and init the card.
2209          */
2210         err = mmc_init_card(host, rocr, NULL);
2211         if (err)
2212                 goto err;
2213
2214         mmc_release_host(host);
2215         err = mmc_add_card(host->card);
2216         mmc_claim_host(host);
2217         if (err)
2218                 goto remove_card;
2219
2220         return 0;
2221
2222 remove_card:
2223         mmc_release_host(host);
2224         mmc_remove_card(host->card);
2225         mmc_claim_host(host);
2226         host->card = NULL;
2227 err:
2228         mmc_detach_bus(host);
2229
2230         pr_err("%s: error %d whilst initialising MMC card\n",
2231                 mmc_hostname(host), err);
2232
2233         return err;
2234 }