drivers/mmc/core/mmc.c

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