drivers/mmc/core/sd.c

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This source file includes following definitions.
mmc_decode_cid
mmc_decode_csd
mmc_decode_scr
mmc_read_ssr
mmc_read_switch
mmc_sd_switch_hs
sd_select_driver_type
sd_update_bus_speed_mode
sd_set_bus_speed_mode
sd_get_host_max_current
sd_set_current_limit
mmc_sd_init_uhs_card
mmc_dsr_show
mmc_sd_get_cid
mmc_sd_get_csd
mmc_sd_get_ro
mmc_sd_setup_card
mmc_sd_get_max_clock
mmc_sd_card_using_v18
mmc_sd_init_card
mmc_sd_remove
mmc_sd_alive
mmc_sd_detect
_mmc_sd_suspend
mmc_sd_suspend
_mmc_sd_resume
mmc_sd_resume
mmc_sd_runtime_suspend
mmc_sd_runtime_resume
mmc_sd_hw_reset
mmc_attach_sd
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/mmc/core/sd.c
   4  *
   5  *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   6  *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
   7  *  Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
   8  */
   9 
  10 #include <linux/err.h>
  11 #include <linux/sizes.h>
  12 #include <linux/slab.h>
  13 #include <linux/stat.h>
  14 #include <linux/pm_runtime.h>
  15 
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/mmc.h>
  19 #include <linux/mmc/sd.h>
  20 
  21 #include "core.h"
  22 #include "card.h"
  23 #include "host.h"
  24 #include "bus.h"
  25 #include "mmc_ops.h"
  26 #include "sd.h"
  27 #include "sd_ops.h"
  28 
  29 static const unsigned int tran_exp[] = {
  30         10000,          100000,         1000000,        10000000,
  31         0,              0,              0,              0
  32 };
  33 
  34 static const unsigned char tran_mant[] = {
  35         0,      10,     12,     13,     15,     20,     25,     30,
  36         35,     40,     45,     50,     55,     60,     70,     80,
  37 };
  38 
  39 static const unsigned int taac_exp[] = {
  40         1,      10,     100,    1000,   10000,  100000, 1000000, 10000000,
  41 };
  42 
  43 static const unsigned int taac_mant[] = {
  44         0,      10,     12,     13,     15,     20,     25,     30,
  45         35,     40,     45,     50,     55,     60,     70,     80,
  46 };
  47 
  48 static const unsigned int sd_au_size[] = {
  49         0,              SZ_16K / 512,           SZ_32K / 512,   SZ_64K / 512,
  50         SZ_128K / 512,  SZ_256K / 512,          SZ_512K / 512,  SZ_1M / 512,
  51         SZ_2M / 512,    SZ_4M / 512,            SZ_8M / 512,    (SZ_8M + SZ_4M) / 512,
  52         SZ_16M / 512,   (SZ_16M + SZ_8M) / 512, SZ_32M / 512,   SZ_64M / 512,
  53 };
  54 
  55 #define UNSTUFF_BITS(resp,start,size)                                   \
  56         ({                                                              \
  57                 const int __size = size;                                \
  58                 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
  59                 const int __off = 3 - ((start) / 32);                   \
  60                 const int __shft = (start) & 31;                        \
  61                 u32 __res;                                              \
  62                                                                         \
  63                 __res = resp[__off] >> __shft;                          \
  64                 if (__size + __shft > 32)                               \
  65                         __res |= resp[__off-1] << ((32 - __shft) % 32); \
  66                 __res & __mask;                                         \
  67         })
  68 
  69 /*
  70  * Given the decoded CSD structure, decode the raw CID to our CID structure.
  71  */
  72 void mmc_decode_cid(struct mmc_card *card)
  73 {
  74         u32 *resp = card->raw_cid;
  75 
  76         /*
  77          * SD doesn't currently have a version field so we will
  78          * have to assume we can parse this.
  79          */
  80         card->cid.manfid                = UNSTUFF_BITS(resp, 120, 8);
  81         card->cid.oemid                 = UNSTUFF_BITS(resp, 104, 16);
  82         card->cid.prod_name[0]          = UNSTUFF_BITS(resp, 96, 8);
  83         card->cid.prod_name[1]          = UNSTUFF_BITS(resp, 88, 8);
  84         card->cid.prod_name[2]          = UNSTUFF_BITS(resp, 80, 8);
  85         card->cid.prod_name[3]          = UNSTUFF_BITS(resp, 72, 8);
  86         card->cid.prod_name[4]          = UNSTUFF_BITS(resp, 64, 8);
  87         card->cid.hwrev                 = UNSTUFF_BITS(resp, 60, 4);
  88         card->cid.fwrev                 = UNSTUFF_BITS(resp, 56, 4);
  89         card->cid.serial                = UNSTUFF_BITS(resp, 24, 32);
  90         card->cid.year                  = UNSTUFF_BITS(resp, 12, 8);
  91         card->cid.month                 = UNSTUFF_BITS(resp, 8, 4);
  92 
  93         card->cid.year += 2000; /* SD cards year offset */
  94 }
  95 
  96 /*
  97  * Given a 128-bit response, decode to our card CSD structure.
  98  */
  99 static int mmc_decode_csd(struct mmc_card *card)
 100 {
 101         struct mmc_csd *csd = &card->csd;
 102         unsigned int e, m, csd_struct;
 103         u32 *resp = card->raw_csd;
 104 
 105         csd_struct = UNSTUFF_BITS(resp, 126, 2);
 106 
 107         switch (csd_struct) {
 108         case 0:
 109                 m = UNSTUFF_BITS(resp, 115, 4);
 110                 e = UNSTUFF_BITS(resp, 112, 3);
 111                 csd->taac_ns     = (taac_exp[e] * taac_mant[m] + 9) / 10;
 112                 csd->taac_clks   = UNSTUFF_BITS(resp, 104, 8) * 100;
 113 
 114                 m = UNSTUFF_BITS(resp, 99, 4);
 115                 e = UNSTUFF_BITS(resp, 96, 3);
 116                 csd->max_dtr      = tran_exp[e] * tran_mant[m];
 117                 csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 118 
 119                 e = UNSTUFF_BITS(resp, 47, 3);
 120                 m = UNSTUFF_BITS(resp, 62, 12);
 121                 csd->capacity     = (1 + m) << (e + 2);
 122 
 123                 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
 124                 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
 125                 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
 126                 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
 127                 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
 128                 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
 129                 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
 130                 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 131 
 132                 if (UNSTUFF_BITS(resp, 46, 1)) {
 133                         csd->erase_size = 1;
 134                 } else if (csd->write_blkbits >= 9) {
 135                         csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
 136                         csd->erase_size <<= csd->write_blkbits - 9;
 137                 }
 138                 break;
 139         case 1:
 140                 /*
 141                  * This is a block-addressed SDHC or SDXC card. Most
 142                  * interesting fields are unused and have fixed
 143                  * values. To avoid getting tripped by buggy cards,
 144                  * we assume those fixed values ourselves.
 145                  */
 146                 mmc_card_set_blockaddr(card);
 147 
 148                 csd->taac_ns     = 0; /* Unused */
 149                 csd->taac_clks   = 0; /* Unused */
 150 
 151                 m = UNSTUFF_BITS(resp, 99, 4);
 152                 e = UNSTUFF_BITS(resp, 96, 3);
 153                 csd->max_dtr      = tran_exp[e] * tran_mant[m];
 154                 csd->cmdclass     = UNSTUFF_BITS(resp, 84, 12);
 155                 csd->c_size       = UNSTUFF_BITS(resp, 48, 22);
 156 
 157                 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */
 158                 if (csd->c_size >= 0xFFFF)
 159                         mmc_card_set_ext_capacity(card);
 160 
 161                 m = UNSTUFF_BITS(resp, 48, 22);
 162                 csd->capacity     = (1 + m) << 10;
 163 
 164                 csd->read_blkbits = 9;
 165                 csd->read_partial = 0;
 166                 csd->write_misalign = 0;
 167                 csd->read_misalign = 0;
 168                 csd->r2w_factor = 4; /* Unused */
 169                 csd->write_blkbits = 9;
 170                 csd->write_partial = 0;
 171                 csd->erase_size = 1;
 172                 break;
 173         default:
 174                 pr_err("%s: unrecognised CSD structure version %d\n",
 175                         mmc_hostname(card->host), csd_struct);
 176                 return -EINVAL;
 177         }
 178 
 179         card->erase_size = csd->erase_size;
 180 
 181         return 0;
 182 }
 183 
 184 /*
 185  * Given a 64-bit response, decode to our card SCR structure.
 186  */
 187 static int mmc_decode_scr(struct mmc_card *card)
 188 {
 189         struct sd_scr *scr = &card->scr;
 190         unsigned int scr_struct;
 191         u32 resp[4];
 192 
 193         resp[3] = card->raw_scr[1];
 194         resp[2] = card->raw_scr[0];
 195 
 196         scr_struct = UNSTUFF_BITS(resp, 60, 4);
 197         if (scr_struct != 0) {
 198                 pr_err("%s: unrecognised SCR structure version %d\n",
 199                         mmc_hostname(card->host), scr_struct);
 200                 return -EINVAL;
 201         }
 202 
 203         scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
 204         scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
 205         if (scr->sda_vsn == SCR_SPEC_VER_2)
 206                 /* Check if Physical Layer Spec v3.0 is supported */
 207                 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
 208 
 209         if (scr->sda_spec3) {
 210                 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
 211                 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
 212         }
 213 
 214         if (UNSTUFF_BITS(resp, 55, 1))
 215                 card->erased_byte = 0xFF;
 216         else
 217                 card->erased_byte = 0x0;
 218 
 219         if (scr->sda_spec3)
 220                 scr->cmds = UNSTUFF_BITS(resp, 32, 2);
 221 
 222         /* SD Spec says: any SD Card shall set at least bits 0 and 2 */
 223         if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) ||
 224             !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) {
 225                 pr_err("%s: invalid bus width\n", mmc_hostname(card->host));
 226                 return -EINVAL;
 227         }
 228 
 229         return 0;
 230 }
 231 
 232 /*
 233  * Fetch and process SD Status register.
 234  */
 235 static int mmc_read_ssr(struct mmc_card *card)
 236 {
 237         unsigned int au, es, et, eo;
 238         __be32 *raw_ssr;
 239         u32 resp[4] = {};
 240         u8 discard_support;
 241         int i;
 242 
 243         if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
 244                 pr_warn("%s: card lacks mandatory SD Status function\n",
 245                         mmc_hostname(card->host));
 246                 return 0;
 247         }
 248 
 249         raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL);
 250         if (!raw_ssr)
 251                 return -ENOMEM;
 252 
 253         if (mmc_app_sd_status(card, raw_ssr)) {
 254                 pr_warn("%s: problem reading SD Status register\n",
 255                         mmc_hostname(card->host));
 256                 kfree(raw_ssr);
 257                 return 0;
 258         }
 259 
 260         for (i = 0; i < 16; i++)
 261                 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]);
 262 
 263         kfree(raw_ssr);
 264 
 265         /*
 266          * UNSTUFF_BITS only works with four u32s so we have to offset the
 267          * bitfield positions accordingly.
 268          */
 269         au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4);
 270         if (au) {
 271                 if (au <= 9 || card->scr.sda_spec3) {
 272                         card->ssr.au = sd_au_size[au];
 273                         es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16);
 274                         et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6);
 275                         if (es && et) {
 276                                 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2);
 277                                 card->ssr.erase_timeout = (et * 1000) / es;
 278                                 card->ssr.erase_offset = eo * 1000;
 279                         }
 280                 } else {
 281                         pr_warn("%s: SD Status: Invalid Allocation Unit size\n",
 282                                 mmc_hostname(card->host));
 283                 }
 284         }
 285 
 286         /*
 287          * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set
 288          */
 289         resp[3] = card->raw_ssr[6];
 290         discard_support = UNSTUFF_BITS(resp, 313 - 288, 1);
 291         card->erase_arg = (card->scr.sda_specx && discard_support) ?
 292                             SD_DISCARD_ARG : SD_ERASE_ARG;
 293 
 294         return 0;
 295 }
 296 
 297 /*
 298  * Fetches and decodes switch information
 299  */
 300 static int mmc_read_switch(struct mmc_card *card)
 301 {
 302         int err;
 303         u8 *status;
 304 
 305         if (card->scr.sda_vsn < SCR_SPEC_VER_1)
 306                 return 0;
 307 
 308         if (!(card->csd.cmdclass & CCC_SWITCH)) {
 309                 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n",
 310                         mmc_hostname(card->host));
 311                 return 0;
 312         }
 313 
 314         status = kmalloc(64, GFP_KERNEL);
 315         if (!status)
 316                 return -ENOMEM;
 317 
 318         /*
 319          * Find out the card's support bits with a mode 0 operation.
 320          * The argument does not matter, as the support bits do not
 321          * change with the arguments.
 322          */
 323         err = mmc_sd_switch(card, 0, 0, 0, status);
 324         if (err) {
 325                 /*
 326                  * If the host or the card can't do the switch,
 327                  * fail more gracefully.
 328                  */
 329                 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT)
 330                         goto out;
 331 
 332                 pr_warn("%s: problem reading Bus Speed modes\n",
 333                         mmc_hostname(card->host));
 334                 err = 0;
 335 
 336                 goto out;
 337         }
 338 
 339         if (status[13] & SD_MODE_HIGH_SPEED)
 340                 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR;
 341 
 342         if (card->scr.sda_spec3) {
 343                 card->sw_caps.sd3_bus_mode = status[13];
 344                 /* Driver Strengths supported by the card */
 345                 card->sw_caps.sd3_drv_type = status[9];
 346                 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8;
 347         }
 348 
 349 out:
 350         kfree(status);
 351 
 352         return err;
 353 }
 354 
 355 /*
 356  * Test if the card supports high-speed mode and, if so, switch to it.
 357  */
 358 int mmc_sd_switch_hs(struct mmc_card *card)
 359 {
 360         int err;
 361         u8 *status;
 362 
 363         if (card->scr.sda_vsn < SCR_SPEC_VER_1)
 364                 return 0;
 365 
 366         if (!(card->csd.cmdclass & CCC_SWITCH))
 367                 return 0;
 368 
 369         if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
 370                 return 0;
 371 
 372         if (card->sw_caps.hs_max_dtr == 0)
 373                 return 0;
 374 
 375         status = kmalloc(64, GFP_KERNEL);
 376         if (!status)
 377                 return -ENOMEM;
 378 
 379         err = mmc_sd_switch(card, 1, 0, 1, status);
 380         if (err)
 381                 goto out;
 382 
 383         if ((status[16] & 0xF) != 1) {
 384                 pr_warn("%s: Problem switching card into high-speed mode!\n",
 385                         mmc_hostname(card->host));
 386                 err = 0;
 387         } else {
 388                 err = 1;
 389         }
 390 
 391 out:
 392         kfree(status);
 393 
 394         return err;
 395 }
 396 
 397 static int sd_select_driver_type(struct mmc_card *card, u8 *status)
 398 {
 399         int card_drv_type, drive_strength, drv_type;
 400         int err;
 401 
 402         card->drive_strength = 0;
 403 
 404         card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
 405 
 406         drive_strength = mmc_select_drive_strength(card,
 407                                                    card->sw_caps.uhs_max_dtr,
 408                                                    card_drv_type, &drv_type);
 409 
 410         if (drive_strength) {
 411                 err = mmc_sd_switch(card, 1, 2, drive_strength, status);
 412                 if (err)
 413                         return err;
 414                 if ((status[15] & 0xF) != drive_strength) {
 415                         pr_warn("%s: Problem setting drive strength!\n",
 416                                 mmc_hostname(card->host));
 417                         return 0;
 418                 }
 419                 card->drive_strength = drive_strength;
 420         }
 421 
 422         if (drv_type)
 423                 mmc_set_driver_type(card->host, drv_type);
 424 
 425         return 0;
 426 }
 427 
 428 static void sd_update_bus_speed_mode(struct mmc_card *card)
 429 {
 430         /*
 431          * If the host doesn't support any of the UHS-I modes, fallback on
 432          * default speed.
 433          */
 434         if (!mmc_host_uhs(card->host)) {
 435                 card->sd_bus_speed = 0;
 436                 return;
 437         }
 438 
 439         if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
 440             (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
 441                         card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
 442         } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
 443                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
 444                         card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
 445         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 446                     MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
 447                     SD_MODE_UHS_SDR50)) {
 448                         card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
 449         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 450                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
 451                    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
 452                         card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
 453         } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
 454                     MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
 455                     MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
 456                     SD_MODE_UHS_SDR12)) {
 457                         card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
 458         }
 459 }
 460 
 461 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status)
 462 {
 463         int err;
 464         unsigned int timing = 0;
 465 
 466         switch (card->sd_bus_speed) {
 467         case UHS_SDR104_BUS_SPEED:
 468                 timing = MMC_TIMING_UHS_SDR104;
 469                 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
 470                 break;
 471         case UHS_DDR50_BUS_SPEED:
 472                 timing = MMC_TIMING_UHS_DDR50;
 473                 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
 474                 break;
 475         case UHS_SDR50_BUS_SPEED:
 476                 timing = MMC_TIMING_UHS_SDR50;
 477                 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
 478                 break;
 479         case UHS_SDR25_BUS_SPEED:
 480                 timing = MMC_TIMING_UHS_SDR25;
 481                 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
 482                 break;
 483         case UHS_SDR12_BUS_SPEED:
 484                 timing = MMC_TIMING_UHS_SDR12;
 485                 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
 486                 break;
 487         default:
 488                 return 0;
 489         }
 490 
 491         err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status);
 492         if (err)
 493                 return err;
 494 
 495         if ((status[16] & 0xF) != card->sd_bus_speed)
 496                 pr_warn("%s: Problem setting bus speed mode!\n",
 497                         mmc_hostname(card->host));
 498         else {
 499                 mmc_set_timing(card->host, timing);
 500                 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
 501         }
 502 
 503         return 0;
 504 }
 505 
 506 /* Get host's max current setting at its current voltage */
 507 static u32 sd_get_host_max_current(struct mmc_host *host)
 508 {
 509         u32 voltage, max_current;
 510 
 511         voltage = 1 << host->ios.vdd;
 512         switch (voltage) {
 513         case MMC_VDD_165_195:
 514                 max_current = host->max_current_180;
 515                 break;
 516         case MMC_VDD_29_30:
 517         case MMC_VDD_30_31:
 518                 max_current = host->max_current_300;
 519                 break;
 520         case MMC_VDD_32_33:
 521         case MMC_VDD_33_34:
 522                 max_current = host->max_current_330;
 523                 break;
 524         default:
 525                 max_current = 0;
 526         }
 527 
 528         return max_current;
 529 }
 530 
 531 static int sd_set_current_limit(struct mmc_card *card, u8 *status)
 532 {
 533         int current_limit = SD_SET_CURRENT_NO_CHANGE;
 534         int err;
 535         u32 max_current;
 536 
 537         /*
 538          * Current limit switch is only defined for SDR50, SDR104, and DDR50
 539          * bus speed modes. For other bus speed modes, we do not change the
 540          * current limit.
 541          */
 542         if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) &&
 543             (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) &&
 544             (card->sd_bus_speed != UHS_DDR50_BUS_SPEED))
 545                 return 0;
 546 
 547         /*
 548          * Host has different current capabilities when operating at
 549          * different voltages, so find out its max current first.
 550          */
 551         max_current = sd_get_host_max_current(card->host);
 552 
 553         /*
 554          * We only check host's capability here, if we set a limit that is
 555          * higher than the card's maximum current, the card will be using its
 556          * maximum current, e.g. if the card's maximum current is 300ma, and
 557          * when we set current limit to 200ma, the card will draw 200ma, and
 558          * when we set current limit to 400/600/800ma, the card will draw its
 559          * maximum 300ma from the host.
 560          *
 561          * The above is incorrect: if we try to set a current limit that is
 562          * not supported by the card, the card can rightfully error out the
 563          * attempt, and remain at the default current limit.  This results
 564          * in a 300mA card being limited to 200mA even though the host
 565          * supports 800mA. Failures seen with SanDisk 8GB UHS cards with
 566          * an iMX6 host. --rmk
 567          */
 568         if (max_current >= 800 &&
 569             card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800)
 570                 current_limit = SD_SET_CURRENT_LIMIT_800;
 571         else if (max_current >= 600 &&
 572                  card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600)
 573                 current_limit = SD_SET_CURRENT_LIMIT_600;
 574         else if (max_current >= 400 &&
 575                  card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400)
 576                 current_limit = SD_SET_CURRENT_LIMIT_400;
 577         else if (max_current >= 200 &&
 578                  card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200)
 579                 current_limit = SD_SET_CURRENT_LIMIT_200;
 580 
 581         if (current_limit != SD_SET_CURRENT_NO_CHANGE) {
 582                 err = mmc_sd_switch(card, 1, 3, current_limit, status);
 583                 if (err)
 584                         return err;
 585 
 586                 if (((status[15] >> 4) & 0x0F) != current_limit)
 587                         pr_warn("%s: Problem setting current limit!\n",
 588                                 mmc_hostname(card->host));
 589 
 590         }
 591 
 592         return 0;
 593 }
 594 
 595 /*
 596  * UHS-I specific initialization procedure
 597  */
 598 static int mmc_sd_init_uhs_card(struct mmc_card *card)
 599 {
 600         int err;
 601         u8 *status;
 602 
 603         if (!(card->csd.cmdclass & CCC_SWITCH))
 604                 return 0;
 605 
 606         status = kmalloc(64, GFP_KERNEL);
 607         if (!status)
 608                 return -ENOMEM;
 609 
 610         /* Set 4-bit bus width */
 611         err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
 612         if (err)
 613                 goto out;
 614 
 615         mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
 616 
 617         /*
 618          * Select the bus speed mode depending on host
 619          * and card capability.
 620          */
 621         sd_update_bus_speed_mode(card);
 622 
 623         /* Set the driver strength for the card */
 624         err = sd_select_driver_type(card, status);
 625         if (err)
 626                 goto out;
 627 
 628         /* Set current limit for the card */
 629         err = sd_set_current_limit(card, status);
 630         if (err)
 631                 goto out;
 632 
 633         /* Set bus speed mode of the card */
 634         err = sd_set_bus_speed_mode(card, status);
 635         if (err)
 636                 goto out;
 637 
 638         /*
 639          * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
 640          * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
 641          */
 642         if (!mmc_host_is_spi(card->host) &&
 643                 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 ||
 644                  card->host->ios.timing == MMC_TIMING_UHS_DDR50 ||
 645                  card->host->ios.timing == MMC_TIMING_UHS_SDR104)) {
 646                 err = mmc_execute_tuning(card);
 647 
 648                 /*
 649                  * As SD Specifications Part1 Physical Layer Specification
 650                  * Version 3.01 says, CMD19 tuning is available for unlocked
 651                  * cards in transfer state of 1.8V signaling mode. The small
 652                  * difference between v3.00 and 3.01 spec means that CMD19
 653                  * tuning is also available for DDR50 mode.
 654                  */
 655                 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) {
 656                         pr_warn("%s: ddr50 tuning failed\n",
 657                                 mmc_hostname(card->host));
 658                         err = 0;
 659                 }
 660         }
 661 
 662 out:
 663         kfree(status);
 664 
 665         return err;
 666 }
 667 
 668 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 669         card->raw_cid[2], card->raw_cid[3]);
 670 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
 671         card->raw_csd[2], card->raw_csd[3]);
 672 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
 673 MMC_DEV_ATTR(ssr,
 674         "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n",
 675                 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2],
 676                 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5],
 677                 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8],
 678                 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11],
 679                 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14],
 680                 card->raw_ssr[15]);
 681 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
 682 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
 683 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 684 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 685 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 686 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
 687 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
 688 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
 689 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 690 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
 691 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
 692 
 693 
 694 static ssize_t mmc_dsr_show(struct device *dev,
 695                            struct device_attribute *attr,
 696                            char *buf)
 697 {
 698        struct mmc_card *card = mmc_dev_to_card(dev);
 699        struct mmc_host *host = card->host;
 700 
 701        if (card->csd.dsr_imp && host->dsr_req)
 702                return sprintf(buf, "0x%x\n", host->dsr);
 703        else
 704                /* return default DSR value */
 705                return sprintf(buf, "0x%x\n", 0x404);
 706 }
 707 
 708 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
 709 
 710 static struct attribute *sd_std_attrs[] = {
 711         &dev_attr_cid.attr,
 712         &dev_attr_csd.attr,
 713         &dev_attr_scr.attr,
 714         &dev_attr_ssr.attr,
 715         &dev_attr_date.attr,
 716         &dev_attr_erase_size.attr,
 717         &dev_attr_preferred_erase_size.attr,
 718         &dev_attr_fwrev.attr,
 719         &dev_attr_hwrev.attr,
 720         &dev_attr_manfid.attr,
 721         &dev_attr_name.attr,
 722         &dev_attr_oemid.attr,
 723         &dev_attr_serial.attr,
 724         &dev_attr_ocr.attr,
 725         &dev_attr_rca.attr,
 726         &dev_attr_dsr.attr,
 727         NULL,
 728 };
 729 ATTRIBUTE_GROUPS(sd_std);
 730 
 731 struct device_type sd_type = {
 732         .groups = sd_std_groups,
 733 };
 734 
 735 /*
 736  * Fetch CID from card.
 737  */
 738 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr)
 739 {
 740         int err;
 741         u32 max_current;
 742         int retries = 10;
 743         u32 pocr = ocr;
 744 
 745 try_again:
 746         if (!retries) {
 747                 ocr &= ~SD_OCR_S18R;
 748                 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
 749         }
 750 
 751         /*
 752          * Since we're changing the OCR value, we seem to
 753          * need to tell some cards to go back to the idle
 754          * state.  We wait 1ms to give cards time to
 755          * respond.
 756          */
 757         mmc_go_idle(host);
 758 
 759         /*
 760          * If SD_SEND_IF_COND indicates an SD 2.0
 761          * compliant card and we should set bit 30
 762          * of the ocr to indicate that we can handle
 763          * block-addressed SDHC cards.
 764          */
 765         err = mmc_send_if_cond(host, ocr);
 766         if (!err)
 767                 ocr |= SD_OCR_CCS;
 768 
 769         /*
 770          * If the host supports one of UHS-I modes, request the card
 771          * to switch to 1.8V signaling level. If the card has failed
 772          * repeatedly to switch however, skip this.
 773          */
 774         if (retries && mmc_host_uhs(host))
 775                 ocr |= SD_OCR_S18R;
 776 
 777         /*
 778          * If the host can supply more than 150mA at current voltage,
 779          * XPC should be set to 1.
 780          */
 781         max_current = sd_get_host_max_current(host);
 782         if (max_current > 150)
 783                 ocr |= SD_OCR_XPC;
 784 
 785         err = mmc_send_app_op_cond(host, ocr, rocr);
 786         if (err)
 787                 return err;
 788 
 789         /*
 790          * In case CCS and S18A in the response is set, start Signal Voltage
 791          * Switch procedure. SPI mode doesn't support CMD11.
 792          */
 793         if (!mmc_host_is_spi(host) && rocr &&
 794            ((*rocr & 0x41000000) == 0x41000000)) {
 795                 err = mmc_set_uhs_voltage(host, pocr);
 796                 if (err == -EAGAIN) {
 797                         retries--;
 798                         goto try_again;
 799                 } else if (err) {
 800                         retries = 0;
 801                         goto try_again;
 802                 }
 803         }
 804 
 805         err = mmc_send_cid(host, cid);
 806         return err;
 807 }
 808 
 809 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card)
 810 {
 811         int err;
 812 
 813         /*
 814          * Fetch CSD from card.
 815          */
 816         err = mmc_send_csd(card, card->raw_csd);
 817         if (err)
 818                 return err;
 819 
 820         err = mmc_decode_csd(card);
 821         if (err)
 822                 return err;
 823 
 824         return 0;
 825 }
 826 
 827 static int mmc_sd_get_ro(struct mmc_host *host)
 828 {
 829         int ro;
 830 
 831         /*
 832          * Some systems don't feature a write-protect pin and don't need one.
 833          * E.g. because they only have micro-SD card slot. For those systems
 834          * assume that the SD card is always read-write.
 835          */
 836         if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT)
 837                 return 0;
 838 
 839         if (!host->ops->get_ro)
 840                 return -1;
 841 
 842         ro = host->ops->get_ro(host);
 843 
 844         return ro;
 845 }
 846 
 847 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
 848         bool reinit)
 849 {
 850         int err;
 851 
 852         if (!reinit) {
 853                 /*
 854                  * Fetch SCR from card.
 855                  */
 856                 err = mmc_app_send_scr(card);
 857                 if (err)
 858                         return err;
 859 
 860                 err = mmc_decode_scr(card);
 861                 if (err)
 862                         return err;
 863 
 864                 /*
 865                  * Fetch and process SD Status register.
 866                  */
 867                 err = mmc_read_ssr(card);
 868                 if (err)
 869                         return err;
 870 
 871                 /* Erase init depends on CSD and SSR */
 872                 mmc_init_erase(card);
 873 
 874                 /*
 875                  * Fetch switch information from card.
 876                  */
 877                 err = mmc_read_switch(card);
 878                 if (err)
 879                         return err;
 880         }
 881 
 882         /*
 883          * For SPI, enable CRC as appropriate.
 884          * This CRC enable is located AFTER the reading of the
 885          * card registers because some SDHC cards are not able
 886          * to provide valid CRCs for non-512-byte blocks.
 887          */
 888         if (mmc_host_is_spi(host)) {
 889                 err = mmc_spi_set_crc(host, use_spi_crc);
 890                 if (err)
 891                         return err;
 892         }
 893 
 894         /*
 895          * Check if read-only switch is active.
 896          */
 897         if (!reinit) {
 898                 int ro = mmc_sd_get_ro(host);
 899 
 900                 if (ro < 0) {
 901                         pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n",
 902                                 mmc_hostname(host));
 903                 } else if (ro > 0) {
 904                         mmc_card_set_readonly(card);
 905                 }
 906         }
 907 
 908         return 0;
 909 }
 910 
 911 unsigned mmc_sd_get_max_clock(struct mmc_card *card)
 912 {
 913         unsigned max_dtr = (unsigned int)-1;
 914 
 915         if (mmc_card_hs(card)) {
 916                 if (max_dtr > card->sw_caps.hs_max_dtr)
 917                         max_dtr = card->sw_caps.hs_max_dtr;
 918         } else if (max_dtr > card->csd.max_dtr) {
 919                 max_dtr = card->csd.max_dtr;
 920         }
 921 
 922         return max_dtr;
 923 }
 924 
 925 static bool mmc_sd_card_using_v18(struct mmc_card *card)
 926 {
 927         /*
 928          * According to the SD spec., the Bus Speed Mode (function group 1) bits
 929          * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus
 930          * they can be used to determine if the card has already switched to
 931          * 1.8V signaling.
 932          */
 933         return card->sw_caps.sd3_bus_mode &
 934                (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50);
 935 }
 936 
 937 /*
 938  * Handle the detection and initialisation of a card.
 939  *
 940  * In the case of a resume, "oldcard" will contain the card
 941  * we're trying to reinitialise.
 942  */
 943 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 944         struct mmc_card *oldcard)
 945 {
 946         struct mmc_card *card;
 947         int err;
 948         u32 cid[4];
 949         u32 rocr = 0;
 950         bool v18_fixup_failed = false;
 951 
 952         WARN_ON(!host->claimed);
 953 retry:
 954         err = mmc_sd_get_cid(host, ocr, cid, &rocr);
 955         if (err)
 956                 return err;
 957 
 958         if (oldcard) {
 959                 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
 960                         pr_debug("%s: Perhaps the card was replaced\n",
 961                                 mmc_hostname(host));
 962                         return -ENOENT;
 963                 }
 964 
 965                 card = oldcard;
 966         } else {
 967                 /*
 968                  * Allocate card structure.
 969                  */
 970                 card = mmc_alloc_card(host, &sd_type);
 971                 if (IS_ERR(card))
 972                         return PTR_ERR(card);
 973 
 974                 card->ocr = ocr;
 975                 card->type = MMC_TYPE_SD;
 976                 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 977         }
 978 
 979         /*
 980          * Call the optional HC's init_card function to handle quirks.
 981          */
 982         if (host->ops->init_card)
 983                 host->ops->init_card(host, card);
 984 
 985         /*
 986          * For native busses:  get card RCA and quit open drain mode.
 987          */
 988         if (!mmc_host_is_spi(host)) {
 989                 err = mmc_send_relative_addr(host, &card->rca);
 990                 if (err)
 991                         goto free_card;
 992         }
 993 
 994         if (!oldcard) {
 995                 err = mmc_sd_get_csd(host, card);
 996                 if (err)
 997                         goto free_card;
 998 
 999                 mmc_decode_cid(card);
1000         }
1001 
1002         /*
1003          * handling only for cards supporting DSR and hosts requesting
1004          * DSR configuration
1005          */
1006         if (card->csd.dsr_imp && host->dsr_req)
1007                 mmc_set_dsr(host);
1008 
1009         /*
1010          * Select card, as all following commands rely on that.
1011          */
1012         if (!mmc_host_is_spi(host)) {
1013                 err = mmc_select_card(card);
1014                 if (err)
1015                         goto free_card;
1016         }
1017 
1018         err = mmc_sd_setup_card(host, card, oldcard != NULL);
1019         if (err)
1020                 goto free_card;
1021 
1022         /*
1023          * If the card has not been power cycled, it may still be using 1.8V
1024          * signaling. Detect that situation and try to initialize a UHS-I (1.8V)
1025          * transfer mode.
1026          */
1027         if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
1028             mmc_sd_card_using_v18(card) &&
1029             host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
1030                 /*
1031                  * Re-read switch information in case it has changed since
1032                  * oldcard was initialized.
1033                  */
1034                 if (oldcard) {
1035                         err = mmc_read_switch(card);
1036                         if (err)
1037                                 goto free_card;
1038                 }
1039                 if (mmc_sd_card_using_v18(card)) {
1040                         if (mmc_host_set_uhs_voltage(host) ||
1041                             mmc_sd_init_uhs_card(card)) {
1042                                 v18_fixup_failed = true;
1043                                 mmc_power_cycle(host, ocr);
1044                                 if (!oldcard)
1045                                         mmc_remove_card(card);
1046                                 goto retry;
1047                         }
1048                         goto done;
1049                 }
1050         }
1051 
1052         /* Initialization sequence for UHS-I cards */
1053         if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) {
1054                 err = mmc_sd_init_uhs_card(card);
1055                 if (err)
1056                         goto free_card;
1057         } else {
1058                 /*
1059                  * Attempt to change to high-speed (if supported)
1060                  */
1061                 err = mmc_sd_switch_hs(card);
1062                 if (err > 0)
1063                         mmc_set_timing(card->host, MMC_TIMING_SD_HS);
1064                 else if (err)
1065                         goto free_card;
1066 
1067                 /*
1068                  * Set bus speed.
1069                  */
1070                 mmc_set_clock(host, mmc_sd_get_max_clock(card));
1071 
1072                 /*
1073                  * Switch to wider bus (if supported).
1074                  */
1075                 if ((host->caps & MMC_CAP_4_BIT_DATA) &&
1076                         (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
1077                         err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
1078                         if (err)
1079                                 goto free_card;
1080 
1081                         mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1082                 }
1083         }
1084 
1085         if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
1086             host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
1087                 pr_err("%s: Host failed to negotiate down from 3.3V\n",
1088                         mmc_hostname(host));
1089                 err = -EINVAL;
1090                 goto free_card;
1091         }
1092 done:
1093         host->card = card;
1094         return 0;
1095 
1096 free_card:
1097         if (!oldcard)
1098                 mmc_remove_card(card);
1099 
1100         return err;
1101 }
1102 
1103 /*
1104  * Host is being removed. Free up the current card.
1105  */
1106 static void mmc_sd_remove(struct mmc_host *host)
1107 {
1108         mmc_remove_card(host->card);
1109         host->card = NULL;
1110 }
1111 
1112 /*
1113  * Card detection - card is alive.
1114  */
1115 static int mmc_sd_alive(struct mmc_host *host)
1116 {
1117         return mmc_send_status(host->card, NULL);
1118 }
1119 
1120 /*
1121  * Card detection callback from host.
1122  */
1123 static void mmc_sd_detect(struct mmc_host *host)
1124 {
1125         int err;
1126 
1127         mmc_get_card(host->card, NULL);
1128 
1129         /*
1130          * Just check if our card has been removed.
1131          */
1132         err = _mmc_detect_card_removed(host);
1133 
1134         mmc_put_card(host->card, NULL);
1135 
1136         if (err) {
1137                 mmc_sd_remove(host);
1138 
1139                 mmc_claim_host(host);
1140                 mmc_detach_bus(host);
1141                 mmc_power_off(host);
1142                 mmc_release_host(host);
1143         }
1144 }
1145 
1146 static int _mmc_sd_suspend(struct mmc_host *host)
1147 {
1148         int err = 0;
1149 
1150         mmc_claim_host(host);
1151 
1152         if (mmc_card_suspended(host->card))
1153                 goto out;
1154 
1155         if (!mmc_host_is_spi(host))
1156                 err = mmc_deselect_cards(host);
1157 
1158         if (!err) {
1159                 mmc_power_off(host);
1160                 mmc_card_set_suspended(host->card);
1161         }
1162 
1163 out:
1164         mmc_release_host(host);
1165         return err;
1166 }
1167 
1168 /*
1169  * Callback for suspend
1170  */
1171 static int mmc_sd_suspend(struct mmc_host *host)
1172 {
1173         int err;
1174 
1175         err = _mmc_sd_suspend(host);
1176         if (!err) {
1177                 pm_runtime_disable(&host->card->dev);
1178                 pm_runtime_set_suspended(&host->card->dev);
1179         }
1180 
1181         return err;
1182 }
1183 
1184 /*
1185  * This function tries to determine if the same card is still present
1186  * and, if so, restore all state to it.
1187  */
1188 static int _mmc_sd_resume(struct mmc_host *host)
1189 {
1190         int err = 0;
1191 
1192         mmc_claim_host(host);
1193 
1194         if (!mmc_card_suspended(host->card))
1195                 goto out;
1196 
1197         mmc_power_up(host, host->card->ocr);
1198         err = mmc_sd_init_card(host, host->card->ocr, host->card);
1199         mmc_card_clr_suspended(host->card);
1200 
1201 out:
1202         mmc_release_host(host);
1203         return err;
1204 }
1205 
1206 /*
1207  * Callback for resume
1208  */
1209 static int mmc_sd_resume(struct mmc_host *host)
1210 {
1211         pm_runtime_enable(&host->card->dev);
1212         return 0;
1213 }
1214 
1215 /*
1216  * Callback for runtime_suspend.
1217  */
1218 static int mmc_sd_runtime_suspend(struct mmc_host *host)
1219 {
1220         int err;
1221 
1222         if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
1223                 return 0;
1224 
1225         err = _mmc_sd_suspend(host);
1226         if (err)
1227                 pr_err("%s: error %d doing aggressive suspend\n",
1228                         mmc_hostname(host), err);
1229 
1230         return err;
1231 }
1232 
1233 /*
1234  * Callback for runtime_resume.
1235  */
1236 static int mmc_sd_runtime_resume(struct mmc_host *host)
1237 {
1238         int err;
1239 
1240         err = _mmc_sd_resume(host);
1241         if (err && err != -ENOMEDIUM)
1242                 pr_err("%s: error %d doing runtime resume\n",
1243                         mmc_hostname(host), err);
1244 
1245         return 0;
1246 }
1247 
1248 static int mmc_sd_hw_reset(struct mmc_host *host)
1249 {
1250         mmc_power_cycle(host, host->card->ocr);
1251         return mmc_sd_init_card(host, host->card->ocr, host->card);
1252 }
1253 
1254 static const struct mmc_bus_ops mmc_sd_ops = {
1255         .remove = mmc_sd_remove,
1256         .detect = mmc_sd_detect,
1257         .runtime_suspend = mmc_sd_runtime_suspend,
1258         .runtime_resume = mmc_sd_runtime_resume,
1259         .suspend = mmc_sd_suspend,
1260         .resume = mmc_sd_resume,
1261         .alive = mmc_sd_alive,
1262         .shutdown = mmc_sd_suspend,
1263         .hw_reset = mmc_sd_hw_reset,
1264 };
1265 
1266 /*
1267  * Starting point for SD card init.
1268  */
1269 int mmc_attach_sd(struct mmc_host *host)
1270 {
1271         int err;
1272         u32 ocr, rocr;
1273 
1274         WARN_ON(!host->claimed);
1275 
1276         err = mmc_send_app_op_cond(host, 0, &ocr);
1277         if (err)
1278                 return err;
1279 
1280         mmc_attach_bus(host, &mmc_sd_ops);
1281         if (host->ocr_avail_sd)
1282                 host->ocr_avail = host->ocr_avail_sd;
1283 
1284         /*
1285          * We need to get OCR a different way for SPI.
1286          */
1287         if (mmc_host_is_spi(host)) {
1288                 mmc_go_idle(host);
1289 
1290                 err = mmc_spi_read_ocr(host, 0, &ocr);
1291                 if (err)
1292                         goto err;
1293         }
1294 
1295         /*
1296          * Some SD cards claims an out of spec VDD voltage range. Let's treat
1297          * these bits as being in-valid and especially also bit7.
1298          */
1299         ocr &= ~0x7FFF;
1300 
1301         rocr = mmc_select_voltage(host, ocr);
1302 
1303         /*
1304          * Can we support the voltage(s) of the card(s)?
1305          */
1306         if (!rocr) {
1307                 err = -EINVAL;
1308                 goto err;
1309         }
1310 
1311         /*
1312          * Detect and init the card.
1313          */
1314         err = mmc_sd_init_card(host, rocr, NULL);
1315         if (err)
1316                 goto err;
1317 
1318         mmc_release_host(host);
1319         err = mmc_add_card(host->card);
1320         if (err)
1321                 goto remove_card;
1322 
1323         mmc_claim_host(host);
1324         return 0;
1325 
1326 remove_card:
1327         mmc_remove_card(host->card);
1328         host->card = NULL;
1329         mmc_claim_host(host);
1330 err:
1331         mmc_detach_bus(host);
1332 
1333         pr_err("%s: error %d whilst initialising SD card\n",
1334                 mmc_hostname(host), err);
1335 
1336         return err;
1337 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/mmc/core/sd.c

DEFINITIONS
