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 "card.h"
  25 #include "host.h"
  26 #include "bus.h"
  27 #include "mmc_ops.h"
  28 #include "quirks.h"
  29 #include "sd_ops.h"
  30 #include "pwrseq.h"
  31
  32 #define DEFAULT_CMD6_TIMEOUT_MS 500
  33 #define MIN_CACHE_EN_TIMEOUT_MS 1600
  34
  35 static const unsigned int tran_exp[] = {
  36         10000,          100000,         1000000,        10000000,
  37         0,              0,              0,              0
  38 };
  39
  40 static const unsigned char tran_mant[] = {
  41         0,      10,     12,     13,     15,     20,     25,     30,
  42         35,     40,     45,     50,     55,     60,     70,     80,
  43 };
  44
  45 static const unsigned int taac_exp[] = {
  46         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  47 };
  48
  49 static const unsigned int taac_mant[] = {
  50         0,      10,     12,     13,     15,     20,     25,     30,
  51         35,     40,     45,     50,     55,     60,     70,     80,
  52 };
  53
  54 #define UNSTUFF_BITS(resp,start,size)                                   \
  55         ({                                                              \
  56                 const int __size = size;                                \
  57                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  58                 const int __off = 3 - ((start) / 32);                   \
  59                 const int __shft = (start) & 31;                        \
  60                 u32 __res;                                              \
  61                                                                         \
  62                 __res = resp[__off] >> __shft;                          \
  63                 if (__size + __shft > 32)                               \
  64                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  65                 __res & __mask;                                         \
  66         })
  67
  68 /*
  69  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  70  */
  71 static int mmc_decode_cid(struct mmc_card *card)
  72 {
  73         u32 *resp = card->raw_cid;
  74
  75         /*
  76          * The selection of the format here is based upon published
  77          * specs from sandisk and from what people have reported.
  78          */
  79         switch (card->csd.mmca_vsn) {
  80         case 0: /* MMC v1.0 - v1.2 */
  81         case 1: /* MMC v1.4 */
  82                 card->cid.manfid        = UNSTUFF_BITS(resp, 104, 24);
  83                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
  84                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
  85                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
  86                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
  87                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
  88                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
  89                 card->cid.prod_name[6]  = UNSTUFF_BITS(resp, 48, 8);
  90                 card->cid.hwrev         = UNSTUFF_BITS(resp, 44, 4);
  91                 card->cid.fwrev         = UNSTUFF_BITS(resp, 40, 4);
  92                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 24);
  93                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
  94                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
  95                 break;
  96
  97         case 2: /* MMC v2.0 - v2.2 */
  98         case 3: /* MMC v3.1 - v3.3 */
  99         case 4: /* MMC v4 */
 100                 card->cid.manfid        = UNSTUFF_BITS(resp, 120, 8);
 101                 card->cid.oemid         = UNSTUFF_BITS(resp, 104, 16);
 102                 card->cid.prod_name[0]  = UNSTUFF_BITS(resp, 96, 8);
 103                 card->cid.prod_name[1]  = UNSTUFF_BITS(resp, 88, 8);
 104                 card->cid.prod_name[2]  = UNSTUFF_BITS(resp, 80, 8);
 105                 card->cid.prod_name[3]  = UNSTUFF_BITS(resp, 72, 8);
 106                 card->cid.prod_name[4]  = UNSTUFF_BITS(resp, 64, 8);
 107                 card->cid.prod_name[5]  = UNSTUFF_BITS(resp, 56, 8);
 108                 card->cid.prv           = UNSTUFF_BITS(resp, 48, 8);
 109                 card->cid.serial        = UNSTUFF_BITS(resp, 16, 32);
 110                 card->cid.month         = UNSTUFF_BITS(resp, 12, 4);
 111                 card->cid.year          = UNSTUFF_BITS(resp, 8, 4) + 1997;
 112                 break;
 113
 114         default:
 115                 pr_err("%s: card has unknown MMCA version %d\n",
 116                         mmc_hostname(card->host), card->csd.mmca_vsn);
 117                 return -EINVAL;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static void mmc_set_erase_size(struct mmc_card *card)
 124 {
 125         if (card->ext_csd.erase_group_def & 1)
 126                 card->erase_size = card->ext_csd.hc_erase_size;
 127         else
 128                 card->erase_size = card->csd.erase_size;
 129
 130         mmc_init_erase(card);
 131 }
 132
 133 /*
 134  * Given a 128-bit response, decode to our card CSD structure.
 135  */
 136 static int mmc_decode_csd(struct mmc_card *card)
 137 {
 138         struct mmc_csd *csd = &card->csd;
 139         unsigned int e, m, a, b;
 140         u32 *resp = card->raw_csd;
 141
 142         /*
 143          * We only understand CSD structure v1.1 and v1.2.
 144          * v1.2 has extra information in bits 15, 11 and 10.
 145          * We also support eMMC v4.4 & v4.41.
 146          */
 147         csd->structure = UNSTUFF_BITS(resp, 126, 2);
 148         if (csd->structure == 0) {
 149                 pr_err("%s: unrecognised CSD structure version %d\n",
 150                         mmc_hostname(card->host), csd->structure);
 151                 return -EINVAL;
 152         }
 153
 154         csd->mmca_vsn    = UNSTUFF_BITS(resp, 122, 4);
 155         m = UNSTUFF_BITS(resp, 115, 4);
 156         e = UNSTUFF_BITS(resp, 112, 3);
 157         csd->taac_ns     = (taac_exp[e] * taac_mant[m] + 9) / 10;
 158         csd->taac_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 159
 160         m = UNSTUFF_BITS(resp, 99, 4);
 161         e = UNSTUFF_BITS(resp, 96, 3);
 162         csd->max_dtr      = tran_exp[e] * tran_mant[m];
 163         csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 164
 165         e = UNSTUFF_BITS(resp, 47, 3);
 166         m = UNSTUFF_BITS(resp, 62, 12);
 167         csd->capacity     = (1 + m) << (e + 2);
 168
 169         csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 170         csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 171         csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 172         csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 173         csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 174         csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 175         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 176         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 177
 178         if (csd->write_blkbits >= 9) {
 179                 a = UNSTUFF_BITS(resp, 42, 5);
 180                 b = UNSTUFF_BITS(resp, 37, 5);
 181                 csd->erase_size = (a + 1) * (b + 1);
 182                 csd->erase_size <<= csd->write_blkbits - 9;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static void mmc_select_card_type(struct mmc_card *card)
 189 {
 190         struct mmc_host *host = card->host;
 191         u8 card_type = card->ext_csd.raw_card_type;
 192         u32 caps = host->caps, caps2 = host->caps2;
 193         unsigned int hs_max_dtr = 0, hs200_max_dtr = 0;
 194         unsigned int avail_type = 0;
 195
 196         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 197             card_type & EXT_CSD_CARD_TYPE_HS_26) {
 198                 hs_max_dtr = MMC_HIGH_26_MAX_DTR;
 199                 avail_type |= EXT_CSD_CARD_TYPE_HS_26;
 200         }
 201
 202         if (caps & MMC_CAP_MMC_HIGHSPEED &&
 203             card_type & EXT_CSD_CARD_TYPE_HS_52) {
 204                 hs_max_dtr = MMC_HIGH_52_MAX_DTR;
 205                 avail_type |= EXT_CSD_CARD_TYPE_HS_52;
 206         }
 207
 208         if (caps & (MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR) &&
 209             card_type & EXT_CSD_CARD_TYPE_DDR_1_8V) {
 210                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 211                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_8V;
 212         }
 213
 214         if (caps & MMC_CAP_1_2V_DDR &&
 215             card_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
 216                 hs_max_dtr = MMC_HIGH_DDR_MAX_DTR;
 217                 avail_type |= EXT_CSD_CARD_TYPE_DDR_1_2V;
 218         }
 219
 220         if (caps2 & MMC_CAP2_HS200_1_8V_SDR &&
 221             card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) {
 222                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 223                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_8V;
 224         }
 225
 226         if (caps2 & MMC_CAP2_HS200_1_2V_SDR &&
 227             card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) {
 228                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 229                 avail_type |= EXT_CSD_CARD_TYPE_HS200_1_2V;
 230         }
 231
 232         if (caps2 & MMC_CAP2_HS400_1_8V &&
 233             card_type & EXT_CSD_CARD_TYPE_HS400_1_8V) {
 234                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 235                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_8V;
 236         }
 237
 238         if (caps2 & MMC_CAP2_HS400_1_2V &&
 239             card_type & EXT_CSD_CARD_TYPE_HS400_1_2V) {
 240                 hs200_max_dtr = MMC_HS200_MAX_DTR;
 241                 avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V;
 242         }
 243
 244         if ((caps2 & MMC_CAP2_HS400_ES) &&
 245             card->ext_csd.strobe_support &&
 246             (avail_type & EXT_CSD_CARD_TYPE_HS400))
 247                 avail_type |= EXT_CSD_CARD_TYPE_HS400ES;
 248
 249         card->ext_csd.hs_max_dtr = hs_max_dtr;
 250         card->ext_csd.hs200_max_dtr = hs200_max_dtr;
 251         card->mmc_avail_type = avail_type;
 252 }
 253
 254 static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 255 {
 256         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 257
 258         /*
 259          * Disable these attributes by default
 260          */
 261         card->ext_csd.enhanced_area_offset = -EINVAL;
 262         card->ext_csd.enhanced_area_size = -EINVAL;
 263
 264         /*
 265          * Enhanced area feature support -- check whether the eMMC
 266          * card has the Enhanced area enabled.  If so, export enhanced
 267          * area offset and size to user by adding sysfs interface.
 268          */
 269         if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
 270             (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
 271                 if (card->ext_csd.partition_setting_completed) {
 272                         hc_erase_grp_sz =
 273                                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 274                         hc_wp_grp_sz =
 275                                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 276
 277                         /*
 278                          * calculate the enhanced data area offset, in bytes
 279                          */
 280                         card->ext_csd.enhanced_area_offset =
 281                                 (((unsigned long long)ext_csd[139]) << 24) +
 282                                 (((unsigned long long)ext_csd[138]) << 16) +
 283                                 (((unsigned long long)ext_csd[137]) << 8) +
 284                                 (((unsigned long long)ext_csd[136]));
 285                         if (mmc_card_blockaddr(card))
 286                                 card->ext_csd.enhanced_area_offset <<= 9;
 287                         /*
 288                          * calculate the enhanced data area size, in kilobytes
 289                          */
 290                         card->ext_csd.enhanced_area_size =
 291                                 (ext_csd[142] << 16) + (ext_csd[141] << 8) +
 292                                 ext_csd[140];
 293                         card->ext_csd.enhanced_area_size *=
 294                                 (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
 295                         card->ext_csd.enhanced_area_size <<= 9;
 296                 } else {
 297                         pr_warn("%s: defines enhanced area without partition setting complete\n",
 298                                 mmc_hostname(card->host));
 299                 }
 300         }
 301 }
 302
 303 static void mmc_part_add(struct mmc_card *card, u64 size,
 304                          unsigned int part_cfg, char *name, int idx, bool ro,
 305                          int area_type)
 306 {
 307         card->part[card->nr_parts].size = size;
 308         card->part[card->nr_parts].part_cfg = part_cfg;
 309         sprintf(card->part[card->nr_parts].name, name, idx);
 310         card->part[card->nr_parts].force_ro = ro;
 311         card->part[card->nr_parts].area_type = area_type;
 312         card->nr_parts++;
 313 }
 314
 315 static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 316 {
 317         int idx;
 318         u8 hc_erase_grp_sz, hc_wp_grp_sz;
 319         u64 part_size;
 320
 321         /*
 322          * General purpose partition feature support --
 323          * If ext_csd has the size of general purpose partitions,
 324          * set size, part_cfg, partition name in mmc_part.
 325          */
 326         if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
 327             EXT_CSD_PART_SUPPORT_PART_EN) {
 328                 hc_erase_grp_sz =
 329                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 330                 hc_wp_grp_sz =
 331                         ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 332
 333                 for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
 334                         if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
 335                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
 336                             !ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
 337                                 continue;
 338                         if (card->ext_csd.partition_setting_completed == 0) {
 339                                 pr_warn("%s: has partition size defined without partition complete\n",
 340                                         mmc_hostname(card->host));
 341                                 break;
 342                         }
 343                         part_size =
 344                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
 345                                 << 16) +
 346                                 (ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
 347                                 << 8) +
 348                                 ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 349                         part_size *= (hc_erase_grp_sz * hc_wp_grp_sz);
 350                         mmc_part_add(card, part_size << 19,
 351                                 EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 352                                 "gp%d", idx, false,
 353                                 MMC_BLK_DATA_AREA_GP);
 354                 }
 355         }
 356 }
 357
 358 /* Minimum partition switch timeout in milliseconds */
 359 #define MMC_MIN_PART_SWITCH_TIME        300
 360
 361 /*
 362  * Decode extended CSD.
 363  */
 364 static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 365 {
 366         int err = 0, idx;
 367         u64 part_size;
 368         struct device_node *np;
 369         bool broken_hpi = false;
 370
 371         /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
 372         card->ext_csd.raw_ext_csd_structure = ext_csd[EXT_CSD_STRUCTURE];
 373         if (card->csd.structure == 3) {
 374                 if (card->ext_csd.raw_ext_csd_structure > 2) {
 375                         pr_err("%s: unrecognised EXT_CSD structure "
 376                                 "version %d\n", mmc_hostname(card->host),
 377                                         card->ext_csd.raw_ext_csd_structure);
 378                         err = -EINVAL;
 379                         goto out;
 380                 }
 381         }
 382
 383         np = mmc_of_find_child_device(card->host, 0);
 384         if (np && of_device_is_compatible(np, "mmc-card"))
 385                 broken_hpi = of_property_read_bool(np, "broken-hpi");
 386         of_node_put(np);
 387
 388         /*
 389          * The EXT_CSD format is meant to be forward compatible. As long
 390          * as CSD_STRUCTURE does not change, all values for EXT_CSD_REV
 391          * are authorized, see JEDEC JESD84-B50 section B.8.
 392          */
 393         card->ext_csd.rev = ext_csd[EXT_CSD_REV];
 394
 395         /* fixup device after ext_csd revision field is updated */
 396         mmc_fixup_device(card, mmc_ext_csd_fixups);
 397
 398         card->ext_csd.raw_sectors[0] = ext_csd[EXT_CSD_SEC_CNT + 0];
 399         card->ext_csd.raw_sectors[1] = ext_csd[EXT_CSD_SEC_CNT + 1];
 400         card->ext_csd.raw_sectors[2] = ext_csd[EXT_CSD_SEC_CNT + 2];
 401         card->ext_csd.raw_sectors[3] = ext_csd[EXT_CSD_SEC_CNT + 3];
 402         if (card->ext_csd.rev >= 2) {
 403                 card->ext_csd.sectors =
 404                         ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
 405                         ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
 406                         ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
 407                         ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
 408
 409                 /* Cards with density > 2GiB are sector addressed */
 410                 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 411                         mmc_card_set_blockaddr(card);
 412         }
 413
 414         card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
 415         card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
 416         mmc_select_card_type(card);
 417
 418         card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
 419         card->ext_csd.raw_erase_timeout_mult =
 420                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 421         card->ext_csd.raw_hc_erase_grp_size =
 422                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
 423         if (card->ext_csd.rev >= 3) {
 424                 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
 425                 card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
 426
 427                 /* EXT_CSD value is in units of 10ms, but we store in ms */
 428                 card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
 429
 430                 /* Sleep / awake timeout in 100ns units */
 431                 if (sa_shift > 0 && sa_shift <= 0x17)
 432                         card->ext_csd.sa_timeout =
 433                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
 434                 card->ext_csd.erase_group_def =
 435                         ext_csd[EXT_CSD_ERASE_GROUP_DEF];
 436                 card->ext_csd.hc_erase_timeout = 300 *
 437                         ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
 438                 card->ext_csd.hc_erase_size =
 439                         ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
 440
 441                 card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
 442
 443                 /*
 444                  * There are two boot regions of equal size, defined in
 445                  * multiples of 128K.
 446                  */
 447                 if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
 448                         for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
 449                                 part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
 450                                 mmc_part_add(card, part_size,
 451                                         EXT_CSD_PART_CONFIG_ACC_BOOT0 + idx,
 452                                         "boot%d", idx, true,
 453                                         MMC_BLK_DATA_AREA_BOOT);
 454                         }
 455                 }
 456         }
 457
 458         card->ext_csd.raw_hc_erase_gap_size =
 459                 ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
 460         card->ext_csd.raw_sec_trim_mult =
 461                 ext_csd[EXT_CSD_SEC_TRIM_MULT];
 462         card->ext_csd.raw_sec_erase_mult =
 463                 ext_csd[EXT_CSD_SEC_ERASE_MULT];
 464         card->ext_csd.raw_sec_feature_support =
 465                 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 466         card->ext_csd.raw_trim_mult =
 467                 ext_csd[EXT_CSD_TRIM_MULT];
 468         card->ext_csd.raw_partition_support = ext_csd[EXT_CSD_PARTITION_SUPPORT];
 469         card->ext_csd.raw_driver_strength = ext_csd[EXT_CSD_DRIVER_STRENGTH];
 470         if (card->ext_csd.rev >= 4) {
 471                 if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED] &
 472                     EXT_CSD_PART_SETTING_COMPLETED)
 473                         card->ext_csd.partition_setting_completed = 1;
 474                 else
 475                         card->ext_csd.partition_setting_completed = 0;
 476
 477                 mmc_manage_enhanced_area(card, ext_csd);
 478
 479                 mmc_manage_gp_partitions(card, ext_csd);
 480
 481                 card->ext_csd.sec_trim_mult =
 482                         ext_csd[EXT_CSD_SEC_TRIM_MULT];
 483                 card->ext_csd.sec_erase_mult =
 484                         ext_csd[EXT_CSD_SEC_ERASE_MULT];
 485                 card->ext_csd.sec_feature_support =
 486                         ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
 487                 card->ext_csd.trim_timeout = 300 *
 488                         ext_csd[EXT_CSD_TRIM_MULT];
 489
 490                 /*
 491                  * Note that the call to mmc_part_add above defaults to read
 492                  * only. If this default assumption is changed, the call must
 493                  * take into account the value of boot_locked below.
 494                  */
 495                 card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 496                 card->ext_csd.boot_ro_lockable = true;
 497
 498                 /* Save power class values */
 499                 card->ext_csd.raw_pwr_cl_52_195 =
 500                         ext_csd[EXT_CSD_PWR_CL_52_195];
 501                 card->ext_csd.raw_pwr_cl_26_195 =
 502                         ext_csd[EXT_CSD_PWR_CL_26_195];
 503                 card->ext_csd.raw_pwr_cl_52_360 =
 504                         ext_csd[EXT_CSD_PWR_CL_52_360];
 505                 card->ext_csd.raw_pwr_cl_26_360 =
 506                         ext_csd[EXT_CSD_PWR_CL_26_360];
 507                 card->ext_csd.raw_pwr_cl_200_195 =
 508                         ext_csd[EXT_CSD_PWR_CL_200_195];
 509                 card->ext_csd.raw_pwr_cl_200_360 =
 510                         ext_csd[EXT_CSD_PWR_CL_200_360];
 511                 card->ext_csd.raw_pwr_cl_ddr_52_195 =
 512                         ext_csd[EXT_CSD_PWR_CL_DDR_52_195];
 513                 card->ext_csd.raw_pwr_cl_ddr_52_360 =
 514                         ext_csd[EXT_CSD_PWR_CL_DDR_52_360];
 515                 card->ext_csd.raw_pwr_cl_ddr_200_360 =
 516                         ext_csd[EXT_CSD_PWR_CL_DDR_200_360];
 517         }
 518
 519         if (card->ext_csd.rev >= 5) {
 520                 /* Adjust production date as per JEDEC JESD84-B451 */
 521                 if (card->cid.year < 2010)
 522                         card->cid.year += 16;
 523
 524                 /* check whether the eMMC card supports BKOPS */
 525                 if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
 526                         card->ext_csd.bkops = 1;
 527                         card->ext_csd.man_bkops_en =
 528                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 529                                                 EXT_CSD_MANUAL_BKOPS_MASK);
 530                         card->ext_csd.raw_bkops_status =
 531                                 ext_csd[EXT_CSD_BKOPS_STATUS];
 532                         if (card->ext_csd.man_bkops_en)
 533                                 pr_debug("%s: MAN_BKOPS_EN bit is set\n",
 534                                         mmc_hostname(card->host));
 535                         card->ext_csd.auto_bkops_en =
 536                                         (ext_csd[EXT_CSD_BKOPS_EN] &
 537                                                 EXT_CSD_AUTO_BKOPS_MASK);
 538                         if (card->ext_csd.auto_bkops_en)
 539                                 pr_debug("%s: AUTO_BKOPS_EN bit is set\n",
 540                                         mmc_hostname(card->host));
 541                 }
 542
 543                 /* check whether the eMMC card supports HPI */
 544                 if (!mmc_card_broken_hpi(card) &&
 545                     !broken_hpi && (ext_csd[EXT_CSD_HPI_FEATURES] & 0x1)) {
 546                         card->ext_csd.hpi = 1;
 547                         if (ext_csd[EXT_CSD_HPI_FEATURES] & 0x2)
 548                                 card->ext_csd.hpi_cmd = MMC_STOP_TRANSMISSION;
 549                         else
 550                                 card->ext_csd.hpi_cmd = MMC_SEND_STATUS;
 551                         /*
 552                          * Indicate the maximum timeout to close
 553                          * a command interrupted by HPI
 554                          */
 555                         card->ext_csd.out_of_int_time =
 556                                 ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] * 10;
 557                 }
 558
 559                 card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
 560                 card->ext_csd.rst_n_function = ext_csd[EXT_CSD_RST_N_FUNCTION];
 561
 562                 /*
 563                  * RPMB regions are defined in multiples of 128K.
 564                  */
 565                 card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
 566                 if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
 567                         mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
 568                                 EXT_CSD_PART_CONFIG_ACC_RPMB,
 569                                 "rpmb", 0, false,
 570                                 MMC_BLK_DATA_AREA_RPMB);
 571                 }
 572         }
 573
 574         card->ext_csd.raw_erased_mem_count = ext_csd[EXT_CSD_ERASED_MEM_CONT];
 575         if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
 576                 card->erased_byte = 0xFF;
 577         else
 578                 card->erased_byte = 0x0;
 579
 580         /* eMMC v4.5 or later */
 581         card->ext_csd.generic_cmd6_time = DEFAULT_CMD6_TIMEOUT_MS;
 582         if (card->ext_csd.rev >= 6) {
 583                 card->ext_csd.feature_support |= MMC_DISCARD_FEATURE;
 584
 585                 card->ext_csd.generic_cmd6_time = 10 *
 586                         ext_csd[EXT_CSD_GENERIC_CMD6_TIME];
 587                 card->ext_csd.power_off_longtime = 10 *
 588                         ext_csd[EXT_CSD_POWER_OFF_LONG_TIME];
 589
 590                 card->ext_csd.cache_size =
 591                         ext_csd[EXT_CSD_CACHE_SIZE + 0] << 0 |
 592                         ext_csd[EXT_CSD_CACHE_SIZE + 1] << 8 |
 593                         ext_csd[EXT_CSD_CACHE_SIZE + 2] << 16 |
 594                         ext_csd[EXT_CSD_CACHE_SIZE + 3] << 24;
 595
 596                 if (ext_csd[EXT_CSD_DATA_SECTOR_SIZE] == 1)
 597                         card->ext_csd.data_sector_size = 4096;
 598                 else
 599                         card->ext_csd.data_sector_size = 512;
 600
 601                 if ((ext_csd[EXT_CSD_DATA_TAG_SUPPORT] & 1) &&
 602                     (ext_csd[EXT_CSD_TAG_UNIT_SIZE] <= 8)) {
 603                         card->ext_csd.data_tag_unit_size =
 604                         ((unsigned int) 1 << ext_csd[EXT_CSD_TAG_UNIT_SIZE]) *
 605                         (card->ext_csd.data_sector_size);
 606                 } else {
 607                         card->ext_csd.data_tag_unit_size = 0;
 608                 }
 609
 610                 card->ext_csd.max_packed_writes =
 611                         ext_csd[EXT_CSD_MAX_PACKED_WRITES];
 612                 card->ext_csd.max_packed_reads =
 613                         ext_csd[EXT_CSD_MAX_PACKED_READS];
 614         } else {
 615                 card->ext_csd.data_sector_size = 512;
 616         }
 617
 618         /*
 619          * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined
 620          * when accessing a specific field", so use it here if there is no
 621          * PARTITION_SWITCH_TIME.
 622          */
 623         if (!card->ext_csd.part_time)
 624                 card->ext_csd.part_time = card->ext_csd.generic_cmd6_time;
 625         /* Some eMMC set the value too low so set a minimum */
 626         if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
 627                 card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
 628
 629         /* eMMC v5 or later */
 630         if (card->ext_csd.rev >= 7) {
 631                 memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
 632                        MMC_FIRMWARE_LEN);
 633                 card->ext_csd.ffu_capable =
 634                         (ext_csd[EXT_CSD_SUPPORTED_MODE] & 0x1) &&
 635                         !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
 636
 637                 card->ext_csd.pre_eol_info = ext_csd[EXT_CSD_PRE_EOL_INFO];
 638                 card->ext_csd.device_life_time_est_typ_a =
 639                         ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_A];
 640                 card->ext_csd.device_life_time_est_typ_b =
 641                         ext_csd[EXT_CSD_DEVICE_LIFE_TIME_EST_TYP_B];
 642         }
 643
 644         /* eMMC v5.1 or later */
 645         if (card->ext_csd.rev >= 8) {
 646                 card->ext_csd.cmdq_support = ext_csd[EXT_CSD_CMDQ_SUPPORT] &
 647                                              EXT_CSD_CMDQ_SUPPORTED;
 648                 card->ext_csd.cmdq_depth = (ext_csd[EXT_CSD_CMDQ_DEPTH] &
 649                                             EXT_CSD_CMDQ_DEPTH_MASK) + 1;
 650                 /* Exclude inefficiently small queue depths */
 651                 if (card->ext_csd.cmdq_depth <= 2) {
 652                         card->ext_csd.cmdq_support = false;
 653                         card->ext_csd.cmdq_depth = 0;
 654                 }
 655                 if (card->ext_csd.cmdq_support) {
 656                         pr_debug("%s: Command Queue supported depth %u\n",
 657                                  mmc_hostname(card->host),
 658                                  card->ext_csd.cmdq_depth);
 659                 }
 660         }
 661 out:
 662         return err;
 663 }
 664
 665 static int mmc_read_ext_csd(struct mmc_card *card)
 666 {
 667         u8 *ext_csd;
 668         int err;
 669
 670         if (!mmc_can_ext_csd(card))
 671                 return 0;
 672
 673         err = mmc_get_ext_csd(card, &ext_csd);
 674         if (err) {
 675                 /* If the host or the card can't do the switch,
 676                  * fail more gracefully. */
 677                 if ((err != -EINVAL)
 678                  && (err != -ENOSYS)
 679                  && (err != -EFAULT))
 680                         return err;
 681
 682                 /*
 683                  * High capacity cards should have this "magic" size
 684                  * stored in their CSD.
 685                  */
 686                 if (card->csd.capacity == (4096 * 512)) {
 687                         pr_err("%s: unable to read EXT_CSD on a possible high capacity card. Card will be ignored.\n",
 688                                 mmc_hostname(card->host));
 689                 } else {
 690                         pr_warn("%s: unable to read EXT_CSD, performance might suffer\n",
 691                                 mmc_hostname(card->host));
 692                         err = 0;
 693                 }
 694
 695                 return err;
 696         }
 697
 698         err = mmc_decode_ext_csd(card, ext_csd);
 699         kfree(ext_csd);
 700         return err;
 701 }
 702
 703 static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 704 {
 705         u8 *bw_ext_csd;
 706         int err;
 707
 708         if (bus_width == MMC_BUS_WIDTH_1)
 709                 return 0;
 710
 711         err = mmc_get_ext_csd(card, &bw_ext_csd);
 712         if (err)
 713                 return err;
 714
 715         /* only compare read only fields */
 716         err = !((card->ext_csd.raw_partition_support ==
 717                         bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
 718                 (card->ext_csd.raw_erased_mem_count ==
 719                         bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
 720                 (card->ext_csd.rev ==
 721                         bw_ext_csd[EXT_CSD_REV]) &&
 722                 (card->ext_csd.raw_ext_csd_structure ==
 723                         bw_ext_csd[EXT_CSD_STRUCTURE]) &&
 724                 (card->ext_csd.raw_card_type ==
 725                         bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
 726                 (card->ext_csd.raw_s_a_timeout ==
 727                         bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
 728                 (card->ext_csd.raw_hc_erase_gap_size ==
 729                         bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
 730                 (card->ext_csd.raw_erase_timeout_mult ==
 731                         bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
 732                 (card->ext_csd.raw_hc_erase_grp_size ==
 733                         bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
 734                 (card->ext_csd.raw_sec_trim_mult ==
 735                         bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
 736                 (card->ext_csd.raw_sec_erase_mult ==
 737                         bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
 738                 (card->ext_csd.raw_sec_feature_support ==
 739                         bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
 740                 (card->ext_csd.raw_trim_mult ==
 741                         bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
 742                 (card->ext_csd.raw_sectors[0] ==
 743                         bw_ext_csd[EXT_CSD_SEC_CNT + 0]) &&
 744                 (card->ext_csd.raw_sectors[1] ==
 745                         bw_ext_csd[EXT_CSD_SEC_CNT + 1]) &&
 746                 (card->ext_csd.raw_sectors[2] ==
 747                         bw_ext_csd[EXT_CSD_SEC_CNT + 2]) &&
 748                 (card->ext_csd.raw_sectors[3] ==
 749                         bw_ext_csd[EXT_CSD_SEC_CNT + 3]) &&
 750                 (card->ext_csd.raw_pwr_cl_52_195 ==
 751                         bw_ext_csd[EXT_CSD_PWR_CL_52_195]) &&
 752                 (card->ext_csd.raw_pwr_cl_26_195 ==
 753                         bw_ext_csd[EXT_CSD_PWR_CL_26_195]) &&
 754                 (card->ext_csd.raw_pwr_cl_52_360 ==
 755                         bw_ext_csd[EXT_CSD_PWR_CL_52_360]) &&
 756                 (card->ext_csd.raw_pwr_cl_26_360 ==
 757                         bw_ext_csd[EXT_CSD_PWR_CL_26_360]) &&
 758                 (card->ext_csd.raw_pwr_cl_200_195 ==
 759                         bw_ext_csd[EXT_CSD_PWR_CL_200_195]) &&
 760                 (card->ext_csd.raw_pwr_cl_200_360 ==
 761                         bw_ext_csd[EXT_CSD_PWR_CL_200_360]) &&
 762                 (card->ext_csd.raw_pwr_cl_ddr_52_195 ==
 763                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_195]) &&
 764                 (card->ext_csd.raw_pwr_cl_ddr_52_360 ==
 765                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_52_360]) &&
 766                 (card->ext_csd.raw_pwr_cl_ddr_200_360 ==
 767                         bw_ext_csd[EXT_CSD_PWR_CL_DDR_200_360]));
 768
 769         if (err)
 770                 err = -EINVAL;
 771
 772         kfree(bw_ext_csd);
 773         return err;
 774 }
 775
 776 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 777         card->raw_cid[2], card->raw_cid[3]);
 778 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 779         card->raw_csd[2], card->raw_csd[3]);
 780 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 781 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 782 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 783 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 784 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 785 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 786 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 787 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 788 MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
 789 MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev);
 790 MMC_DEV_ATTR(pre_eol_info, "0x%02x\n", card->ext_csd.pre_eol_info);
 791 MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
 792         card->ext_csd.device_life_time_est_typ_a,
 793         card->ext_csd.device_life_time_est_typ_b);
 794 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 795 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 796                 card->ext_csd.enhanced_area_offset);
 797 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
 798 MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
 799 MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
 800 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
 801 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
 802 MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
 803
 804 static ssize_t mmc_fwrev_show(struct device *dev,
 805                               struct device_attribute *attr,
 806                               char *buf)
 807 {
 808         struct mmc_card *card = mmc_dev_to_card(dev);
 809
 810         if (card->ext_csd.rev < 7) {
 811                 return sprintf(buf, "0x%x\n", card->cid.fwrev);
 812         } else {
 813                 return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
 814                                card->ext_csd.fwrev);
 815         }
 816 }
 817
 818 static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
 819
 820 static ssize_t mmc_dsr_show(struct device *dev,
 821                             struct device_attribute *attr,
 822                             char *buf)
 823 {
 824         struct mmc_card *card = mmc_dev_to_card(dev);
 825         struct mmc_host *host = card->host;
 826
 827         if (card->csd.dsr_imp && host->dsr_req)
 828                 return sprintf(buf, "0x%x\n", host->dsr);
 829         else
 830                 /* return default DSR value */
 831                 return sprintf(buf, "0x%x\n", 0x404);
 832 }
 833
 834 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
 835
 836 static struct attribute *mmc_std_attrs[] = {
 837         &dev_attr_cid.attr,
 838         &dev_attr_csd.attr,
 839         &dev_attr_date.attr,
 840         &dev_attr_erase_size.attr,
 841         &dev_attr_preferred_erase_size.attr,
 842         &dev_attr_fwrev.attr,
 843         &dev_attr_ffu_capable.attr,
 844         &dev_attr_hwrev.attr,
 845         &dev_attr_manfid.attr,
 846         &dev_attr_name.attr,
 847         &dev_attr_oemid.attr,
 848         &dev_attr_prv.attr,
 849         &dev_attr_rev.attr,
 850         &dev_attr_pre_eol_info.attr,
 851         &dev_attr_life_time.attr,
 852         &dev_attr_serial.attr,
 853         &dev_attr_enhanced_area_offset.attr,
 854         &dev_attr_enhanced_area_size.attr,
 855         &dev_attr_raw_rpmb_size_mult.attr,
 856         &dev_attr_rel_sectors.attr,
 857         &dev_attr_ocr.attr,
 858         &dev_attr_rca.attr,
 859         &dev_attr_dsr.attr,
 860         &dev_attr_cmdq_en.attr,
 861         NULL,
 862 };
 863 ATTRIBUTE_GROUPS(mmc_std);
 864
 865 static struct device_type mmc_type = {
 866         .groups = mmc_std_groups,
 867 };
 868
 869 /*
 870  * Select the PowerClass for the current bus width
 871  * If power class is defined for 4/8 bit bus in the
 872  * extended CSD register, select it by executing the
 873  * mmc_switch command.
 874  */
 875 static int __mmc_select_powerclass(struct mmc_card *card,
 876                                    unsigned int bus_width)
 877 {
 878         struct mmc_host *host = card->host;
 879         struct mmc_ext_csd *ext_csd = &card->ext_csd;
 880         unsigned int pwrclass_val = 0;
 881         int err = 0;
 882
 883         switch (1 << host->ios.vdd) {
 884         case MMC_VDD_165_195:
 885                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 886                         pwrclass_val = ext_csd->raw_pwr_cl_26_195;
 887                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 888                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 889                                 ext_csd->raw_pwr_cl_52_195 :
 890                                 ext_csd->raw_pwr_cl_ddr_52_195;
 891                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 892                         pwrclass_val = ext_csd->raw_pwr_cl_200_195;
 893                 break;
 894         case MMC_VDD_27_28:
 895         case MMC_VDD_28_29:
 896         case MMC_VDD_29_30:
 897         case MMC_VDD_30_31:
 898         case MMC_VDD_31_32:
 899         case MMC_VDD_32_33:
 900         case MMC_VDD_33_34:
 901         case MMC_VDD_34_35:
 902         case MMC_VDD_35_36:
 903                 if (host->ios.clock <= MMC_HIGH_26_MAX_DTR)
 904                         pwrclass_val = ext_csd->raw_pwr_cl_26_360;
 905                 else if (host->ios.clock <= MMC_HIGH_52_MAX_DTR)
 906                         pwrclass_val = (bus_width <= EXT_CSD_BUS_WIDTH_8) ?
 907                                 ext_csd->raw_pwr_cl_52_360 :
 908                                 ext_csd->raw_pwr_cl_ddr_52_360;
 909                 else if (host->ios.clock <= MMC_HS200_MAX_DTR)
 910                         pwrclass_val = (bus_width == EXT_CSD_DDR_BUS_WIDTH_8) ?
 911                                 ext_csd->raw_pwr_cl_ddr_200_360 :
 912                                 ext_csd->raw_pwr_cl_200_360;
 913                 break;
 914         default:
 915                 pr_warn("%s: Voltage range not supported for power class\n",
 916                         mmc_hostname(host));
 917                 return -EINVAL;
 918         }
 919
 920         if (bus_width & (EXT_CSD_BUS_WIDTH_8 | EXT_CSD_DDR_BUS_WIDTH_8))
 921                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_8BIT_MASK) >>
 922                                 EXT_CSD_PWR_CL_8BIT_SHIFT;
 923         else
 924                 pwrclass_val = (pwrclass_val & EXT_CSD_PWR_CL_4BIT_MASK) >>
 925                                 EXT_CSD_PWR_CL_4BIT_SHIFT;
 926
 927         /* If the power class is different from the default value */
 928         if (pwrclass_val > 0) {
 929                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 930                                  EXT_CSD_POWER_CLASS,
 931                                  pwrclass_val,
 932                                  card->ext_csd.generic_cmd6_time);
 933         }
 934
 935         return err;
 936 }
 937
 938 static int mmc_select_powerclass(struct mmc_card *card)
 939 {
 940         struct mmc_host *host = card->host;
 941         u32 bus_width, ext_csd_bits;
 942         int err, ddr;
 943
 944         /* Power class selection is supported for versions >= 4.0 */
 945         if (!mmc_can_ext_csd(card))
 946                 return 0;
 947
 948         bus_width = host->ios.bus_width;
 949         /* Power class values are defined only for 4/8 bit bus */
 950         if (bus_width == MMC_BUS_WIDTH_1)
 951                 return 0;
 952
 953         ddr = card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52;
 954         if (ddr)
 955                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 956                         EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
 957         else
 958                 ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
 959                         EXT_CSD_BUS_WIDTH_8 :  EXT_CSD_BUS_WIDTH_4;
 960
 961         err = __mmc_select_powerclass(card, ext_csd_bits);
 962         if (err)
 963                 pr_warn("%s: power class selection to bus width %d ddr %d failed\n",
 964                         mmc_hostname(host), 1 << bus_width, ddr);
 965
 966         return err;
 967 }
 968
 969 /*
 970  * Set the bus speed for the selected speed mode.
 971  */
 972 static void mmc_set_bus_speed(struct mmc_card *card)
 973 {
 974         unsigned int max_dtr = (unsigned int)-1;
 975
 976         if ((mmc_card_hs200(card) || mmc_card_hs400(card)) &&
 977              max_dtr > card->ext_csd.hs200_max_dtr)
 978                 max_dtr = card->ext_csd.hs200_max_dtr;
 979         else if (mmc_card_hs(card) && max_dtr > card->ext_csd.hs_max_dtr)
 980                 max_dtr = card->ext_csd.hs_max_dtr;
 981         else if (max_dtr > card->csd.max_dtr)
 982                 max_dtr = card->csd.max_dtr;
 983
 984         mmc_set_clock(card->host, max_dtr);
 985 }
 986
 987 /*
 988  * Select the bus width amoung 4-bit and 8-bit(SDR).
 989  * If the bus width is changed successfully, return the selected width value.
 990  * Zero is returned instead of error value if the wide width is not supported.
 991  */
 992 static int mmc_select_bus_width(struct mmc_card *card)
 993 {
 994         static unsigned ext_csd_bits[] = {
 995                 EXT_CSD_BUS_WIDTH_8,
 996                 EXT_CSD_BUS_WIDTH_4,
 997         };
 998         static unsigned bus_widths[] = {
 999                 MMC_BUS_WIDTH_8,
1000                 MMC_BUS_WIDTH_4,
1001         };
1002         struct mmc_host *host = card->host;
1003         unsigned idx, bus_width = 0;
1004         int err = 0;
1005
1006         if (!mmc_can_ext_csd(card) ||
1007             !(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
1008                 return 0;
1009
1010         idx = (host->caps & MMC_CAP_8_BIT_DATA) ? 0 : 1;
1011
1012         /*
1013          * Unlike SD, MMC cards dont have a configuration register to notify
1014          * supported bus width. So bus test command should be run to identify
1015          * the supported bus width or compare the ext csd values of current
1016          * bus width and ext csd values of 1 bit mode read earlier.
1017          */
1018         for (; idx < ARRAY_SIZE(bus_widths); idx++) {
1019                 /*
1020                  * Host is capable of 8bit transfer, then switch
1021                  * the device to work in 8bit transfer mode. If the
1022                  * mmc switch command returns error then switch to
1023                  * 4bit transfer mode. On success set the corresponding
1024                  * bus width on the host.
1025                  */
1026                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1027                                  EXT_CSD_BUS_WIDTH,
1028                                  ext_csd_bits[idx],
1029                                  card->ext_csd.generic_cmd6_time);
1030                 if (err)
1031                         continue;
1032
1033                 bus_width = bus_widths[idx];
1034                 mmc_set_bus_width(host, bus_width);
1035
1036                 /*
1037                  * If controller can't handle bus width test,
1038                  * compare ext_csd previously read in 1 bit mode
1039                  * against ext_csd at new bus width
1040                  */
1041                 if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
1042                         err = mmc_compare_ext_csds(card, bus_width);
1043                 else
1044                         err = mmc_bus_test(card, bus_width);
1045
1046                 if (!err) {
1047                         err = bus_width;
1048                         break;
1049                 } else {
1050                         pr_warn("%s: switch to bus width %d failed\n",
1051                                 mmc_hostname(host), 1 << bus_width);
1052                 }
1053         }
1054
1055         return err;
1056 }
1057
1058 /*
1059  * Switch to the high-speed mode
1060  */
1061 static int mmc_select_hs(struct mmc_card *card)
1062 {
1063         int err;
1064
1065         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1066                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1067                            card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
1068                            true, true, true);
1069         if (err)
1070                 pr_warn("%s: switch to high-speed failed, err:%d\n",
1071                         mmc_hostname(card->host), err);
1072
1073         return err;
1074 }
1075
1076 /*
1077  * Activate wide bus and DDR if supported.
1078  */
1079 static int mmc_select_hs_ddr(struct mmc_card *card)
1080 {
1081         struct mmc_host *host = card->host;
1082         u32 bus_width, ext_csd_bits;
1083         int err = 0;
1084
1085         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_52))
1086                 return 0;
1087
1088         bus_width = host->ios.bus_width;
1089         if (bus_width == MMC_BUS_WIDTH_1)
1090                 return 0;
1091
1092         ext_csd_bits = (bus_width == MMC_BUS_WIDTH_8) ?
1093                 EXT_CSD_DDR_BUS_WIDTH_8 : EXT_CSD_DDR_BUS_WIDTH_4;
1094
1095         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1096                            EXT_CSD_BUS_WIDTH,
1097                            ext_csd_bits,
1098                            card->ext_csd.generic_cmd6_time,
1099                            MMC_TIMING_MMC_DDR52,
1100                            true, true, true);
1101         if (err) {
1102                 pr_err("%s: switch to bus width %d ddr failed\n",
1103                         mmc_hostname(host), 1 << bus_width);
1104                 return err;
1105         }
1106
1107         /*
1108          * eMMC cards can support 3.3V to 1.2V i/o (vccq)
1109          * signaling.
1110          *
1111          * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
1112          *
1113          * 1.8V vccq at 3.3V core voltage (vcc) is not required
1114          * in the JEDEC spec for DDR.
1115          *
1116          * Even (e)MMC card can support 3.3v to 1.2v vccq, but not all
1117          * host controller can support this, like some of the SDHCI
1118          * controller which connect to an eMMC device. Some of these
1119          * host controller still needs to use 1.8v vccq for supporting
1120          * DDR mode.
1121          *
1122          * So the sequence will be:
1123          * if (host and device can both support 1.2v IO)
1124          *      use 1.2v IO;
1125          * else if (host and device can both support 1.8v IO)
1126          *      use 1.8v IO;
1127          * so if host and device can only support 3.3v IO, this is the
1128          * last choice.
1129          *
1130          * WARNING: eMMC rules are NOT the same as SD DDR
1131          */
1132         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_2V) {
1133                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1134                 if (!err)
1135                         return 0;
1136         }
1137
1138         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_DDR_1_8V &&
1139             host->caps & MMC_CAP_1_8V_DDR)
1140                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1141
1142         /* make sure vccq is 3.3v after switching disaster */
1143         if (err)
1144                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);
1145
1146         return err;
1147 }
1148
1149 static int mmc_select_hs400(struct mmc_card *card)
1150 {
1151         struct mmc_host *host = card->host;
1152         unsigned int max_dtr;
1153         int err = 0;
1154         u8 val;
1155
1156         /*
1157          * HS400 mode requires 8-bit bus width
1158          */
1159         if (!(card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1160               host->ios.bus_width == MMC_BUS_WIDTH_8))
1161                 return 0;
1162
1163         /* Switch card to HS mode */
1164         val = EXT_CSD_TIMING_HS;
1165         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1166                            EXT_CSD_HS_TIMING, val,
1167                            card->ext_csd.generic_cmd6_time, 0,
1168                            true, false, true);
1169         if (err) {
1170                 pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
1171                         mmc_hostname(host), err);
1172                 return err;
1173         }
1174
1175         /* Set host controller to HS timing */
1176         mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
1177
1178         /* Prepare host to downgrade to HS timing */
1179         if (host->ops->hs400_downgrade)
1180                 host->ops->hs400_downgrade(host);
1181
1182         /* Reduce frequency to HS frequency */
1183         max_dtr = card->ext_csd.hs_max_dtr;
1184         mmc_set_clock(host, max_dtr);
1185
1186         err = mmc_switch_status(card);
1187         if (err)
1188                 goto out_err;
1189
1190         /* Switch card to DDR */
1191         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1192                          EXT_CSD_BUS_WIDTH,
1193                          EXT_CSD_DDR_BUS_WIDTH_8,
1194                          card->ext_csd.generic_cmd6_time);
1195         if (err) {
1196                 pr_err("%s: switch to bus width for hs400 failed, err:%d\n",
1197                         mmc_hostname(host), err);
1198                 return err;
1199         }
1200
1201         /* Switch card to HS400 */
1202         val = EXT_CSD_TIMING_HS400 |
1203               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1204         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1205                            EXT_CSD_HS_TIMING, val,
1206                            card->ext_csd.generic_cmd6_time, 0,
1207                            true, false, true);
1208         if (err) {
1209                 pr_err("%s: switch to hs400 failed, err:%d\n",
1210                          mmc_hostname(host), err);
1211                 return err;
1212         }
1213
1214         /* Set host controller to HS400 timing and frequency */
1215         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1216         mmc_set_bus_speed(card);
1217
1218         if (host->ops->hs400_complete)
1219                 host->ops->hs400_complete(host);
1220
1221         err = mmc_switch_status(card);
1222         if (err)
1223                 goto out_err;
1224
1225         return 0;
1226
1227 out_err:
1228         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1229                __func__, err);
1230         return err;
1231 }
1232
1233 int mmc_hs200_to_hs400(struct mmc_card *card)
1234 {
1235         return mmc_select_hs400(card);
1236 }
1237
1238 int mmc_hs400_to_hs200(struct mmc_card *card)
1239 {
1240         struct mmc_host *host = card->host;
1241         unsigned int max_dtr;
1242         int err;
1243         u8 val;
1244
1245         /* Reduce frequency to HS */
1246         max_dtr = card->ext_csd.hs_max_dtr;
1247         mmc_set_clock(host, max_dtr);
1248
1249         /* Switch HS400 to HS DDR */
1250         val = EXT_CSD_TIMING_HS;
1251         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1252                            val, card->ext_csd.generic_cmd6_time, 0,
1253                            true, false, true);
1254         if (err)
1255                 goto out_err;
1256
1257         mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
1258
1259         err = mmc_switch_status(card);
1260         if (err)
1261                 goto out_err;
1262
1263         /* Switch HS DDR to HS */
1264         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
1265                            EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
1266                            0, true, false, true);
1267         if (err)
1268                 goto out_err;
1269
1270         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1271
1272         if (host->ops->hs400_downgrade)
1273                 host->ops->hs400_downgrade(host);
1274
1275         err = mmc_switch_status(card);
1276         if (err)
1277                 goto out_err;
1278
1279         /* Switch HS to HS200 */
1280         val = EXT_CSD_TIMING_HS200 |
1281               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1282         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
1283                            val, card->ext_csd.generic_cmd6_time, 0,
1284                            true, false, true);
1285         if (err)
1286                 goto out_err;
1287
1288         mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1289
1290         /*
1291          * For HS200, CRC errors are not a reliable way to know the switch
1292          * failed. If there really is a problem, we would expect tuning will
1293          * fail and the result ends up the same.
1294          */
1295         err = __mmc_switch_status(card, false);
1296         if (err)
1297                 goto out_err;
1298
1299         mmc_set_bus_speed(card);
1300
1301         /* Prepare tuning for HS400 mode. */
1302         if (host->ops->prepare_hs400_tuning)
1303                 host->ops->prepare_hs400_tuning(host, &host->ios);
1304
1305         return 0;
1306
1307 out_err:
1308         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1309                __func__, err);
1310         return err;
1311 }
1312
1313 static void mmc_select_driver_type(struct mmc_card *card)
1314 {
1315         int card_drv_type, drive_strength, drv_type = 0;
1316         int fixed_drv_type = card->host->fixed_drv_type;
1317
1318         card_drv_type = card->ext_csd.raw_driver_strength |
1319                         mmc_driver_type_mask(0);
1320
1321         if (fixed_drv_type >= 0)
1322                 drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
1323                                  ? fixed_drv_type : 0;
1324         else
1325                 drive_strength = mmc_select_drive_strength(card,
1326                                                            card->ext_csd.hs200_max_dtr,
1327                                                            card_drv_type, &drv_type);
1328
1329         card->drive_strength = drive_strength;
1330
1331         if (drv_type)
1332                 mmc_set_driver_type(card->host, drv_type);
1333 }
1334
1335 static int mmc_select_hs400es(struct mmc_card *card)
1336 {
1337         struct mmc_host *host = card->host;
1338         int err = -EINVAL;
1339         u8 val;
1340
1341         if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
1342                 err = -ENOTSUPP;
1343                 goto out_err;
1344         }
1345
1346         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
1347                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1348
1349         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_8V)
1350                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1351
1352         /* If fails try again during next card power cycle */
1353         if (err)
1354                 goto out_err;
1355
1356         err = mmc_select_bus_width(card);
1357         if (err != MMC_BUS_WIDTH_8) {
1358                 pr_err("%s: switch to 8bit bus width failed, err:%d\n",
1359                         mmc_hostname(host), err);
1360                 err = err < 0 ? err : -ENOTSUPP;
1361                 goto out_err;
1362         }
1363
1364         /* Switch card to HS mode */
1365         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1366                            EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
1367                            card->ext_csd.generic_cmd6_time, 0,
1368                            true, false, true);
1369         if (err) {
1370                 pr_err("%s: switch to hs for hs400es failed, err:%d\n",
1371                         mmc_hostname(host), err);
1372                 goto out_err;
1373         }
1374
1375         mmc_set_timing(host, MMC_TIMING_MMC_HS);
1376         err = mmc_switch_status(card);
1377         if (err)
1378                 goto out_err;
1379
1380         mmc_set_clock(host, card->ext_csd.hs_max_dtr);
1381
1382         /* Switch card to DDR with strobe bit */
1383         val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
1384         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1385                          EXT_CSD_BUS_WIDTH,
1386                          val,
1387                          card->ext_csd.generic_cmd6_time);
1388         if (err) {
1389                 pr_err("%s: switch to bus width for hs400es failed, err:%d\n",
1390                         mmc_hostname(host), err);
1391                 goto out_err;
1392         }
1393
1394         mmc_select_driver_type(card);
1395
1396         /* Switch card to HS400 */
1397         val = EXT_CSD_TIMING_HS400 |
1398               card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1399         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1400                            EXT_CSD_HS_TIMING, val,
1401                            card->ext_csd.generic_cmd6_time, 0,
1402                            true, false, true);
1403         if (err) {
1404                 pr_err("%s: switch to hs400es failed, err:%d\n",
1405                         mmc_hostname(host), err);
1406                 goto out_err;
1407         }
1408
1409         /* Set host controller to HS400 timing and frequency */
1410         mmc_set_timing(host, MMC_TIMING_MMC_HS400);
1411
1412         /* Controller enable enhanced strobe function */
1413         host->ios.enhanced_strobe = true;
1414         if (host->ops->hs400_enhanced_strobe)
1415                 host->ops->hs400_enhanced_strobe(host, &host->ios);
1416
1417         err = mmc_switch_status(card);
1418         if (err)
1419                 goto out_err;
1420
1421         return 0;
1422
1423 out_err:
1424         pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1425                __func__, err);
1426         return err;
1427 }
1428
1429 /*
1430  * For device supporting HS200 mode, the following sequence
1431  * should be done before executing the tuning process.
1432  * 1. set the desired bus width(4-bit or 8-bit, 1-bit is not supported)
1433  * 2. switch to HS200 mode
1434  * 3. set the clock to > 52Mhz and <=200MHz
1435  */
1436 static int mmc_select_hs200(struct mmc_card *card)
1437 {
1438         struct mmc_host *host = card->host;
1439         unsigned int old_timing, old_signal_voltage;
1440         int err = -EINVAL;
1441         u8 val;
1442
1443         old_signal_voltage = host->ios.signal_voltage;
1444         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_2V)
1445                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
1446
1447         if (err && card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200_1_8V)
1448                 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
1449
1450         /* If fails try again during next card power cycle */
1451         if (err)
1452                 return err;
1453
1454         mmc_select_driver_type(card);
1455
1456         /*
1457          * Set the bus width(4 or 8) with host's support and
1458          * switch to HS200 mode if bus width is set successfully.
1459          */
1460         err = mmc_select_bus_width(card);
1461         if (err > 0) {
1462                 val = EXT_CSD_TIMING_HS200 |
1463                       card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
1464                 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1465                                    EXT_CSD_HS_TIMING, val,
1466                                    card->ext_csd.generic_cmd6_time, 0,
1467                                    true, false, true);
1468                 if (err)
1469                         goto err;
1470                 old_timing = host->ios.timing;
1471                 mmc_set_timing(host, MMC_TIMING_MMC_HS200);
1472
1473                 /*
1474                  * For HS200, CRC errors are not a reliable way to know the
1475                  * switch failed. If there really is a problem, we would expect
1476                  * tuning will fail and the result ends up the same.
1477                  */
1478                 err = __mmc_switch_status(card, false);
1479
1480                 /*
1481                  * mmc_select_timing() assumes timing has not changed if
1482                  * it is a switch error.
1483                  */
1484                 if (err == -EBADMSG)
1485                         mmc_set_timing(host, old_timing);
1486         }
1487 err:
1488         if (err) {
1489                 /* fall back to the old signal voltage, if fails report error */
1490                 if (mmc_set_signal_voltage(host, old_signal_voltage))
1491                         err = -EIO;
1492
1493                 pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host),
1494                        __func__, err);
1495         }
1496         return err;
1497 }
1498
1499 /*
1500  * Activate High Speed, HS200 or HS400ES mode if supported.
1501  */
1502 static int mmc_select_timing(struct mmc_card *card)
1503 {
1504         int err = 0;
1505
1506         if (!mmc_can_ext_csd(card))
1507                 goto bus_speed;
1508
1509         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
1510                 err = mmc_select_hs400es(card);
1511         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
1512                 err = mmc_select_hs200(card);
1513         else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
1514                 err = mmc_select_hs(card);
1515
1516         if (err && err != -EBADMSG)
1517                 return err;
1518
1519 bus_speed:
1520         /*
1521          * Set the bus speed to the selected bus timing.
1522          * If timing is not selected, backward compatible is the default.
1523          */
1524         mmc_set_bus_speed(card);
1525         return 0;
1526 }
1527
1528 /*
1529  * Execute tuning sequence to seek the proper bus operating
1530  * conditions for HS200 and HS400, which sends CMD21 to the device.
1531  */
1532 static int mmc_hs200_tuning(struct mmc_card *card)
1533 {
1534         struct mmc_host *host = card->host;
1535
1536         /*
1537          * Timing should be adjusted to the HS400 target
1538          * operation frequency for tuning process
1539          */
1540         if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400 &&
1541             host->ios.bus_width == MMC_BUS_WIDTH_8)
1542                 if (host->ops->prepare_hs400_tuning)
1543                         host->ops->prepare_hs400_tuning(host, &host->ios);
1544
1545         return mmc_execute_tuning(card);
1546 }
1547
1548 /*
1549  * Handle the detection and initialisation of a card.
1550  *
1551  * In the case of a resume, "oldcard" will contain the card
1552  * we're trying to reinitialise.
1553  */
1554 static int mmc_init_card(struct mmc_host *host, u32 ocr,
1555         struct mmc_card *oldcard)
1556 {
1557         struct mmc_card *card;
1558         int err;
1559         u32 cid[4];
1560         u32 rocr;
1561
1562         WARN_ON(!host->claimed);
1563
1564         /* Set correct bus mode for MMC before attempting init */
1565         if (!mmc_host_is_spi(host))
1566                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
1567
1568         /*
1569          * Since we're changing the OCR value, we seem to
1570          * need to tell some cards to go back to the idle
1571          * state.  We wait 1ms to give cards time to
1572          * respond.
1573          * mmc_go_idle is needed for eMMC that are asleep
1574          */
1575         mmc_go_idle(host);
1576
1577         /* The extra bit indicates that we support high capacity */
1578         err = mmc_send_op_cond(host, ocr | (1 << 30), &rocr);
1579         if (err)
1580                 goto err;
1581
1582         /*
1583          * For SPI, enable CRC as appropriate.
1584          */
1585         if (mmc_host_is_spi(host)) {
1586                 err = mmc_spi_set_crc(host, use_spi_crc);
1587                 if (err)
1588                         goto err;
1589         }
1590
1591         /*
1592          * Fetch CID from card.
1593          */
1594         err = mmc_send_cid(host, cid);
1595         if (err)
1596                 goto err;
1597
1598         if (oldcard) {
1599                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
1600                         err = -ENOENT;
1601                         goto err;
1602                 }
1603
1604                 card = oldcard;
1605         } else {
1606                 /*
1607                  * Allocate card structure.
1608                  */
1609                 card = mmc_alloc_card(host, &mmc_type);
1610                 if (IS_ERR(card)) {
1611                         err = PTR_ERR(card);
1612                         goto err;
1613                 }
1614
1615                 card->ocr = ocr;
1616                 card->type = MMC_TYPE_MMC;
1617                 card->rca = 1;
1618                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
1619         }
1620
1621         /*
1622          * Call the optional HC's init_card function to handle quirks.
1623          */
1624         if (host->ops->init_card)
1625                 host->ops->init_card(host, card);
1626
1627         /*
1628          * For native busses:  set card RCA and quit open drain mode.
1629          */
1630         if (!mmc_host_is_spi(host)) {
1631                 err = mmc_set_relative_addr(card);
1632                 if (err)
1633                         goto free_card;
1634
1635                 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
1636         }
1637
1638         if (!oldcard) {
1639                 /*
1640                  * Fetch CSD from card.
1641                  */
1642                 err = mmc_send_csd(card, card->raw_csd);
1643                 if (err)
1644                         goto free_card;
1645
1646                 err = mmc_decode_csd(card);
1647                 if (err)
1648                         goto free_card;
1649                 err = mmc_decode_cid(card);
1650                 if (err)
1651                         goto free_card;
1652         }
1653
1654         /*
1655          * handling only for cards supporting DSR and hosts requesting
1656          * DSR configuration
1657          */
1658         if (card->csd.dsr_imp && host->dsr_req)
1659                 mmc_set_dsr(host);
1660
1661         /*
1662          * Select card, as all following commands rely on that.
1663          */
1664         if (!mmc_host_is_spi(host)) {
1665                 err = mmc_select_card(card);
1666                 if (err)
1667                         goto free_card;
1668         }
1669
1670         if (!oldcard) {
1671                 /* Read extended CSD. */
1672                 err = mmc_read_ext_csd(card);
1673                 if (err)
1674                         goto free_card;
1675
1676                 /*
1677                  * If doing byte addressing, check if required to do sector
1678                  * addressing.  Handle the case of <2GB cards needing sector
1679                  * addressing.  See section 8.1 JEDEC Standard JED84-A441;
1680                  * ocr register has bit 30 set for sector addressing.
1681                  */
1682                 if (rocr & BIT(30))
1683                         mmc_card_set_blockaddr(card);
1684
1685                 /* Erase size depends on CSD and Extended CSD */
1686                 mmc_set_erase_size(card);
1687         }
1688
1689         /* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */
1690         if (card->ext_csd.rev >= 3) {
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 free_card;
1760
1761                 err = mmc_select_hs400(card);
1762                 if (err)
1763                         goto free_card;
1764         } else if (!mmc_card_hs400es(card)) {
1765                 /* Select the desired bus width optionally */
1766                 err = mmc_select_bus_width(card);
1767                 if (err > 0 && mmc_card_hs(card)) {
1768                         err = mmc_select_hs_ddr(card);
1769                         if (err)
1770                                 goto free_card;
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_warn("%s: Enabling HPI failed\n",
1790                                 mmc_hostname(card->host));
1791                         card->ext_csd.hpi_en = 0;
1792                         err = 0;
1793                 } else {
1794                         card->ext_csd.hpi_en = 1;
1795                 }
1796         }
1797
1798         /*
1799          * If cache size is higher than 0, this indicates the existence of cache
1800          * and it can be turned on. Note that some eMMCs from Micron has been
1801          * reported to need ~800 ms timeout, while enabling the cache after
1802          * sudden power failure tests. Let's extend the timeout to a minimum of
1803          * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
1804          */
1805         if (card->ext_csd.cache_size > 0) {
1806                 unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
1807
1808                 timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
1809                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1810                                 EXT_CSD_CACHE_CTRL, 1, timeout_ms);
1811                 if (err && err != -EBADMSG)
1812                         goto free_card;
1813
1814                 /*
1815                  * Only if no error, cache is turned on successfully.
1816                  */
1817                 if (err) {
1818                         pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
1819                                 mmc_hostname(card->host), err);
1820                         card->ext_csd.cache_ctrl = 0;
1821                         err = 0;
1822                 } else {
1823                         card->ext_csd.cache_ctrl = 1;
1824                 }
1825         }
1826
1827         /*
1828          * Enable Command Queue if supported. Note that Packed Commands cannot
1829          * be used with Command Queue.
1830          */
1831         card->ext_csd.cmdq_en = false;
1832         if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) {
1833                 err = mmc_cmdq_enable(card);
1834                 if (err && err != -EBADMSG)
1835                         goto free_card;
1836                 if (err) {
1837                         pr_warn("%s: Enabling CMDQ failed\n",
1838                                 mmc_hostname(card->host));
1839                         card->ext_csd.cmdq_support = false;
1840                         card->ext_csd.cmdq_depth = 0;
1841                         err = 0;
1842                 }
1843         }
1844         /*
1845          * In some cases (e.g. RPMB or mmc_test), the Command Queue must be
1846          * disabled for a time, so a flag is needed to indicate to re-enable the
1847          * Command Queue.
1848          */
1849         card->reenable_cmdq = card->ext_csd.cmdq_en;
1850
1851         if (card->ext_csd.cmdq_en && !host->cqe_enabled) {
1852                 err = host->cqe_ops->cqe_enable(host, card);
1853                 if (err) {
1854                         pr_err("%s: Failed to enable CQE, error %d\n",
1855                                 mmc_hostname(host), err);
1856                 } else {
1857                         host->cqe_enabled = true;
1858                         pr_info("%s: Command Queue Engine enabled\n",
1859                                 mmc_hostname(host));
1860                 }
1861         }
1862
1863         if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1864             host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1865                 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1866                         mmc_hostname(host));
1867                 err = -EINVAL;
1868                 goto free_card;
1869         }
1870
1871         if (!oldcard)
1872                 host->card = card;
1873
1874         return 0;
1875
1876 free_card:
1877         if (!oldcard)
1878                 mmc_remove_card(card);
1879 err:
1880         return err;
1881 }
1882
1883 static int mmc_can_sleep(struct mmc_card *card)
1884 {
1885         return (card && card->ext_csd.rev >= 3);
1886 }
1887
1888 static int mmc_sleep(struct mmc_host *host)
1889 {
1890         struct mmc_command cmd = {};
1891         struct mmc_card *card = host->card;
1892         unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
1893         int err;
1894
1895         /* Re-tuning can't be done once the card is deselected */
1896         mmc_retune_hold(host);
1897
1898         err = mmc_deselect_cards(host);
1899         if (err)
1900                 goto out_release;
1901
1902         cmd.opcode = MMC_SLEEP_AWAKE;
1903         cmd.arg = card->rca << 16;
1904         cmd.arg |= 1 << 15;
1905
1906         /*
1907          * If the max_busy_timeout of the host is specified, validate it against
1908          * the sleep cmd timeout. A failure means we need to prevent the host
1909          * from doing hw busy detection, which is done by converting to a R1
1910          * response instead of a R1B. Note, some hosts requires R1B, which also
1911          * means they are on their own when it comes to deal with the busy
1912          * timeout.
1913          */
1914         if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) && host->max_busy_timeout &&
1915             (timeout_ms > host->max_busy_timeout)) {
1916                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1917         } else {
1918                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
1919                 cmd.busy_timeout = timeout_ms;
1920         }
1921
1922         err = mmc_wait_for_cmd(host, &cmd, 0);
1923         if (err)
1924                 goto out_release;
1925
1926         /*
1927          * If the host does not wait while the card signals busy, then we will
1928          * will have to wait the sleep/awake timeout.  Note, we cannot use the
1929          * SEND_STATUS command to poll the status because that command (and most
1930          * others) is invalid while the card sleeps.
1931          */
1932         if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
1933                 mmc_delay(timeout_ms);
1934
1935 out_release:
1936         mmc_retune_release(host);
1937         return err;
1938 }
1939
1940 static int mmc_can_poweroff_notify(const struct mmc_card *card)
1941 {
1942         return card &&
1943                 mmc_card_mmc(card) &&
1944                 (card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
1945 }
1946
1947 static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
1948 {
1949         unsigned int timeout = card->ext_csd.generic_cmd6_time;
1950         int err;
1951
1952         /* Use EXT_CSD_POWER_OFF_SHORT as default notification type. */
1953         if (notify_type == EXT_CSD_POWER_OFF_LONG)
1954                 timeout = card->ext_csd.power_off_longtime;
1955
1956         err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1957                         EXT_CSD_POWER_OFF_NOTIFICATION,
1958                         notify_type, timeout, 0, true, false, false);
1959         if (err)
1960                 pr_err("%s: Power Off Notification timed out, %u\n",
1961                        mmc_hostname(card->host), timeout);
1962
1963         /* Disable the power off notification after the switch operation. */
1964         card->ext_csd.power_off_notification = EXT_CSD_NO_POWER_NOTIFICATION;
1965
1966         return err;
1967 }
1968
1969 /*
1970  * Host is being removed. Free up the current card.
1971  */
1972 static void mmc_remove(struct mmc_host *host)
1973 {
1974         mmc_remove_card(host->card);
1975         host->card = NULL;
1976 }
1977
1978 /*
1979  * Card detection - card is alive.
1980  */
1981 static int mmc_alive(struct mmc_host *host)
1982 {
1983         return mmc_send_status(host->card, NULL);
1984 }
1985
1986 /*
1987  * Card detection callback from host.
1988  */
1989 static void mmc_detect(struct mmc_host *host)
1990 {
1991         int err;
1992
1993         mmc_get_card(host->card, NULL);
1994
1995         /*
1996          * Just check if our card has been removed.
1997          */
1998         err = _mmc_detect_card_removed(host);
1999
2000         mmc_put_card(host->card, NULL);
2001
2002         if (err) {
2003                 mmc_remove(host);
2004
2005                 mmc_claim_host(host);
2006                 mmc_detach_bus(host);
2007                 mmc_power_off(host);
2008                 mmc_release_host(host);
2009         }
2010 }
2011
2012 static bool _mmc_cache_enabled(struct mmc_host *host)
2013 {
2014         return host->card->ext_csd.cache_size > 0 &&
2015                host->card->ext_csd.cache_ctrl & 1;
2016 }
2017
2018 static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
2019 {
2020         int err = 0;
2021         unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
2022                                         EXT_CSD_POWER_OFF_LONG;
2023
2024         mmc_claim_host(host);
2025
2026         if (mmc_card_suspended(host->card))
2027                 goto out;
2028
2029         err = mmc_flush_cache(host->card);
2030         if (err)
2031                 goto out;
2032
2033         if (mmc_can_poweroff_notify(host->card) &&
2034                 ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
2035                 err = mmc_poweroff_notify(host->card, notify_type);
2036         else if (mmc_can_sleep(host->card))
2037                 err = mmc_sleep(host);
2038         else if (!mmc_host_is_spi(host))
2039                 err = mmc_deselect_cards(host);
2040
2041         if (!err) {
2042                 mmc_power_off(host);
2043                 mmc_card_set_suspended(host->card);
2044         }
2045 out:
2046         mmc_release_host(host);
2047         return err;
2048 }
2049
2050 /*
2051  * Suspend callback
2052  */
2053 static int mmc_suspend(struct mmc_host *host)
2054 {
2055         int err;
2056
2057         err = _mmc_suspend(host, true);
2058         if (!err) {
2059                 pm_runtime_disable(&host->card->dev);
2060                 pm_runtime_set_suspended(&host->card->dev);
2061         }
2062
2063         return err;
2064 }
2065
2066 /*
2067  * This function tries to determine if the same card is still present
2068  * and, if so, restore all state to it.
2069  */
2070 static int _mmc_resume(struct mmc_host *host)
2071 {
2072         int err = 0;
2073
2074         mmc_claim_host(host);
2075
2076         if (!mmc_card_suspended(host->card))
2077                 goto out;
2078
2079         mmc_power_up(host, host->card->ocr);
2080         err = mmc_init_card(host, host->card->ocr, host->card);
2081         mmc_card_clr_suspended(host->card);
2082
2083 out:
2084         mmc_release_host(host);
2085         return err;
2086 }
2087
2088 /*
2089  * Shutdown callback
2090  */
2091 static int mmc_shutdown(struct mmc_host *host)
2092 {
2093         int err = 0;
2094
2095         /*
2096          * In a specific case for poweroff notify, we need to resume the card
2097          * before we can shutdown it properly.
2098          */
2099         if (mmc_can_poweroff_notify(host->card) &&
2100                 !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
2101                 err = _mmc_resume(host);
2102
2103         if (!err)
2104                 err = _mmc_suspend(host, false);
2105
2106         return err;
2107 }
2108
2109 /*
2110  * Callback for resume.
2111  */
2112 static int mmc_resume(struct mmc_host *host)
2113 {
2114         pm_runtime_enable(&host->card->dev);
2115         return 0;
2116 }
2117
2118 /*
2119  * Callback for runtime_suspend.
2120  */
2121 static int mmc_runtime_suspend(struct mmc_host *host)
2122 {
2123         int err;
2124
2125         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
2126                 return 0;
2127
2128         err = _mmc_suspend(host, true);
2129         if (err)
2130                 pr_err("%s: error %d doing aggressive suspend\n",
2131                         mmc_hostname(host), err);
2132
2133         return err;
2134 }
2135
2136 /*
2137  * Callback for runtime_resume.
2138  */
2139 static int mmc_runtime_resume(struct mmc_host *host)
2140 {
2141         int err;
2142
2143         err = _mmc_resume(host);
2144         if (err && err != -ENOMEDIUM)
2145                 pr_err("%s: error %d doing runtime resume\n",
2146                         mmc_hostname(host), err);
2147
2148         return 0;
2149 }
2150
2151 static int mmc_can_reset(struct mmc_card *card)
2152 {
2153         u8 rst_n_function;
2154
2155         rst_n_function = card->ext_csd.rst_n_function;
2156         if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
2157                 return 0;
2158         return 1;
2159 }
2160
2161 static int _mmc_hw_reset(struct mmc_host *host)
2162 {
2163         struct mmc_card *card = host->card;
2164
2165         /*
2166          * In the case of recovery, we can't expect flushing the cache to work
2167          * always, but we have a go and ignore errors.
2168          */
2169         mmc_flush_cache(host->card);
2170
2171         if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
2172              mmc_can_reset(card)) {
2173                 /* If the card accept RST_n signal, send it. */
2174                 mmc_set_clock(host, host->f_init);
2175                 host->ops->hw_reset(host);
2176                 /* Set initial state and call mmc_set_ios */
2177                 mmc_set_initial_state(host);
2178         } else {
2179                 /* Do a brute force power cycle */
2180                 mmc_power_cycle(host, card->ocr);
2181                 mmc_pwrseq_reset(host);
2182         }
2183         return mmc_init_card(host, card->ocr, card);
2184 }
2185
2186 static const struct mmc_bus_ops mmc_ops = {
2187         .remove = mmc_remove,
2188         .detect = mmc_detect,
2189         .suspend = mmc_suspend,
2190         .resume = mmc_resume,
2191         .runtime_suspend = mmc_runtime_suspend,
2192         .runtime_resume = mmc_runtime_resume,
2193         .alive = mmc_alive,
2194         .shutdown = mmc_shutdown,
2195         .hw_reset = _mmc_hw_reset,
2196         .cache_enabled = _mmc_cache_enabled,
2197 };
2198
2199 /*
2200  * Starting point for MMC card init.
2201  */
2202 int mmc_attach_mmc(struct mmc_host *host)
2203 {
2204         int err;
2205         u32 ocr, rocr;
2206
2207         WARN_ON(!host->claimed);
2208
2209         /* Set correct bus mode for MMC before attempting attach */
2210         if (!mmc_host_is_spi(host))
2211                 mmc_set_bus_mode(host, MMC_BUSMODE_OPENDRAIN);
2212
2213         err = mmc_send_op_cond(host, 0, &ocr);
2214         if (err)
2215                 return err;
2216
2217         mmc_attach_bus(host, &mmc_ops);
2218         if (host->ocr_avail_mmc)
2219                 host->ocr_avail = host->ocr_avail_mmc;
2220
2221         /*
2222          * We need to get OCR a different way for SPI.
2223          */
2224         if (mmc_host_is_spi(host)) {
2225                 err = mmc_spi_read_ocr(host, 1, &ocr);
2226                 if (err)
2227                         goto err;
2228         }
2229
2230         rocr = mmc_select_voltage(host, ocr);
2231
2232         /*
2233          * Can we support the voltage of the card?
2234          */
2235         if (!rocr) {
2236                 err = -EINVAL;
2237                 goto err;
2238         }
2239
2240         /*
2241          * Detect and init the card.
2242          */
2243         err = mmc_init_card(host, rocr, NULL);
2244         if (err)
2245                 goto err;
2246
2247         mmc_release_host(host);
2248         err = mmc_add_card(host->card);
2249         if (err)
2250                 goto remove_card;
2251
2252         mmc_claim_host(host);
2253         return 0;
2254
2255 remove_card:
2256         mmc_remove_card(host->card);
2257         mmc_claim_host(host);
2258         host->card = NULL;
2259 err:
2260         mmc_detach_bus(host);
2261
2262         pr_err("%s: error %d whilst initialising MMC card\n",
2263                 mmc_hostname(host), err);
2264
2265         return err;
2266 }