drivers/mmc/core/mmc_ops.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  linux/drivers/mmc/core/mmc_ops.h
   4  *
   5  *  Copyright 2006-2007 Pierre Ossman
   6  */
   7
   8 #include <linux/slab.h>
   9 #include <linux/export.h>
  10 #include <linux/types.h>
  11 #include <linux/scatterlist.h>
  12
  13 #include <linux/mmc/host.h>
  14 #include <linux/mmc/card.h>
  15 #include <linux/mmc/mmc.h>
  16
  17 #include "core.h"
  18 #include "card.h"
  19 #include "host.h"
  20 #include "mmc_ops.h"
  21
  22 #define MMC_OPS_TIMEOUT_MS              (10 * 60 * 1000) /* 10min*/
  23 #define MMC_BKOPS_TIMEOUT_MS            (120 * 1000) /* 120s */
  24 #define MMC_CACHE_FLUSH_TIMEOUT_MS      (30 * 1000) /* 30s */
  25
  26 static const u8 tuning_blk_pattern_4bit[] = {
  27         0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
  28         0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
  29         0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
  30         0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
  31         0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
  32         0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
  33         0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
  34         0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
  35 };
  36
  37 static const u8 tuning_blk_pattern_8bit[] = {
  38         0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
  39         0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
  40         0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
  41         0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
  42         0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
  43         0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
  44         0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
  45         0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
  46         0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
  47         0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
  48         0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
  49         0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
  50         0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
  51         0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
  52         0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
  53         0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
  54 };
  55
  56 int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
  57 {
  58         int err;
  59         struct mmc_command cmd = {};
  60
  61         cmd.opcode = MMC_SEND_STATUS;
  62         if (!mmc_host_is_spi(card->host))
  63                 cmd.arg = card->rca << 16;
  64         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
  65
  66         err = mmc_wait_for_cmd(card->host, &cmd, retries);
  67         if (err)
  68                 return err;
  69
  70         /* NOTE: callers are required to understand the difference
  71          * between "native" and SPI format status words!
  72          */
  73         if (status)
  74                 *status = cmd.resp[0];
  75
  76         return 0;
  77 }
  78 EXPORT_SYMBOL_GPL(__mmc_send_status);
  79
  80 int mmc_send_status(struct mmc_card *card, u32 *status)
  81 {
  82         return __mmc_send_status(card, status, MMC_CMD_RETRIES);
  83 }
  84 EXPORT_SYMBOL_GPL(mmc_send_status);
  85
  86 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
  87 {
  88         struct mmc_command cmd = {};
  89
  90         cmd.opcode = MMC_SELECT_CARD;
  91
  92         if (card) {
  93                 cmd.arg = card->rca << 16;
  94                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
  95         } else {
  96                 cmd.arg = 0;
  97                 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
  98         }
  99
 100         return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 101 }
 102
 103 int mmc_select_card(struct mmc_card *card)
 104 {
 105
 106         return _mmc_select_card(card->host, card);
 107 }
 108
 109 int mmc_deselect_cards(struct mmc_host *host)
 110 {
 111         return _mmc_select_card(host, NULL);
 112 }
 113
 114 /*
 115  * Write the value specified in the device tree or board code into the optional
 116  * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
 117  * drive strength of the DAT and CMD outputs. The actual meaning of a given
 118  * value is hardware dependant.
 119  * The presence of the DSR register can be determined from the CSD register,
 120  * bit 76.
 121  */
 122 int mmc_set_dsr(struct mmc_host *host)
 123 {
 124         struct mmc_command cmd = {};
 125
 126         cmd.opcode = MMC_SET_DSR;
 127
 128         cmd.arg = (host->dsr << 16) | 0xffff;
 129         cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
 130
 131         return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 132 }
 133
 134 int mmc_go_idle(struct mmc_host *host)
 135 {
 136         int err;
 137         struct mmc_command cmd = {};
 138
 139         /*
 140          * Non-SPI hosts need to prevent chipselect going active during
 141          * GO_IDLE; that would put chips into SPI mode.  Remind them of
 142          * that in case of hardware that won't pull up DAT3/nCS otherwise.
 143          *
 144          * SPI hosts ignore ios.chip_select; it's managed according to
 145          * rules that must accommodate non-MMC slaves which this layer
 146          * won't even know about.
 147          */
 148         if (!mmc_host_is_spi(host)) {
 149                 mmc_set_chip_select(host, MMC_CS_HIGH);
 150                 mmc_delay(1);
 151         }
 152
 153         cmd.opcode = MMC_GO_IDLE_STATE;
 154         cmd.arg = 0;
 155         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
 156
 157         err = mmc_wait_for_cmd(host, &cmd, 0);
 158
 159         mmc_delay(1);
 160
 161         if (!mmc_host_is_spi(host)) {
 162                 mmc_set_chip_select(host, MMC_CS_DONTCARE);
 163                 mmc_delay(1);
 164         }
 165
 166         host->use_spi_crc = 0;
 167
 168         return err;
 169 }
 170
 171 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 172 {
 173         struct mmc_command cmd = {};
 174         int i, err = 0;
 175
 176         cmd.opcode = MMC_SEND_OP_COND;
 177         cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
 178         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 179
 180         for (i = 100; i; i--) {
 181                 err = mmc_wait_for_cmd(host, &cmd, 0);
 182                 if (err)
 183                         break;
 184
 185                 /* wait until reset completes */
 186                 if (mmc_host_is_spi(host)) {
 187                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 188                                 break;
 189                 } else {
 190                         if (cmd.resp[0] & MMC_CARD_BUSY)
 191                                 break;
 192                 }
 193
 194                 err = -ETIMEDOUT;
 195
 196                 mmc_delay(10);
 197
 198                 /*
 199                  * According to eMMC specification v5.1 section 6.4.3, we
 200                  * should issue CMD1 repeatedly in the idle state until
 201                  * the eMMC is ready. Otherwise some eMMC devices seem to enter
 202                  * the inactive mode after mmc_init_card() issued CMD0 when
 203                  * the eMMC device is busy.
 204                  */
 205                 if (!ocr && !mmc_host_is_spi(host))
 206                         cmd.arg = cmd.resp[0] | BIT(30);
 207         }
 208
 209         if (rocr && !mmc_host_is_spi(host))
 210                 *rocr = cmd.resp[0];
 211
 212         return err;
 213 }
 214
 215 int mmc_set_relative_addr(struct mmc_card *card)
 216 {
 217         struct mmc_command cmd = {};
 218
 219         cmd.opcode = MMC_SET_RELATIVE_ADDR;
 220         cmd.arg = card->rca << 16;
 221         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 222
 223         return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 224 }
 225
 226 static int
 227 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
 228 {
 229         int err;
 230         struct mmc_command cmd = {};
 231
 232         cmd.opcode = opcode;
 233         cmd.arg = arg;
 234         cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
 235
 236         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 237         if (err)
 238                 return err;
 239
 240         memcpy(cxd, cmd.resp, sizeof(u32) * 4);
 241
 242         return 0;
 243 }
 244
 245 /*
 246  * NOTE: void *buf, caller for the buf is required to use DMA-capable
 247  * buffer or on-stack buffer (with some overhead in callee).
 248  */
 249 static int
 250 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 251                 u32 opcode, void *buf, unsigned len)
 252 {
 253         struct mmc_request mrq = {};
 254         struct mmc_command cmd = {};
 255         struct mmc_data data = {};
 256         struct scatterlist sg;
 257
 258         mrq.cmd = &cmd;
 259         mrq.data = &data;
 260
 261         cmd.opcode = opcode;
 262         cmd.arg = 0;
 263
 264         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 265          * rely on callers to never use this with "native" calls for reading
 266          * CSD or CID.  Native versions of those commands use the R2 type,
 267          * not R1 plus a data block.
 268          */
 269         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 270
 271         data.blksz = len;
 272         data.blocks = 1;
 273         data.flags = MMC_DATA_READ;
 274         data.sg = &sg;
 275         data.sg_len = 1;
 276
 277         sg_init_one(&sg, buf, len);
 278
 279         if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
 280                 /*
 281                  * The spec states that CSR and CID accesses have a timeout
 282                  * of 64 clock cycles.
 283                  */
 284                 data.timeout_ns = 0;
 285                 data.timeout_clks = 64;
 286         } else
 287                 mmc_set_data_timeout(&data, card);
 288
 289         mmc_wait_for_req(host, &mrq);
 290
 291         if (cmd.error)
 292                 return cmd.error;
 293         if (data.error)
 294                 return data.error;
 295
 296         return 0;
 297 }
 298
 299 static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
 300 {
 301         int ret, i;
 302         __be32 *csd_tmp;
 303
 304         csd_tmp = kzalloc(16, GFP_KERNEL);
 305         if (!csd_tmp)
 306                 return -ENOMEM;
 307
 308         ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
 309         if (ret)
 310                 goto err;
 311
 312         for (i = 0; i < 4; i++)
 313                 csd[i] = be32_to_cpu(csd_tmp[i]);
 314
 315 err:
 316         kfree(csd_tmp);
 317         return ret;
 318 }
 319
 320 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 321 {
 322         if (mmc_host_is_spi(card->host))
 323                 return mmc_spi_send_csd(card, csd);
 324
 325         return mmc_send_cxd_native(card->host, card->rca << 16, csd,
 326                                 MMC_SEND_CSD);
 327 }
 328
 329 static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
 330 {
 331         int ret, i;
 332         __be32 *cid_tmp;
 333
 334         cid_tmp = kzalloc(16, GFP_KERNEL);
 335         if (!cid_tmp)
 336                 return -ENOMEM;
 337
 338         ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
 339         if (ret)
 340                 goto err;
 341
 342         for (i = 0; i < 4; i++)
 343                 cid[i] = be32_to_cpu(cid_tmp[i]);
 344
 345 err:
 346         kfree(cid_tmp);
 347         return ret;
 348 }
 349
 350 int mmc_send_cid(struct mmc_host *host, u32 *cid)
 351 {
 352         if (mmc_host_is_spi(host))
 353                 return mmc_spi_send_cid(host, cid);
 354
 355         return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
 356 }
 357
 358 int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 359 {
 360         int err;
 361         u8 *ext_csd;
 362
 363         if (!card || !new_ext_csd)
 364                 return -EINVAL;
 365
 366         if (!mmc_can_ext_csd(card))
 367                 return -EOPNOTSUPP;
 368
 369         /*
 370          * As the ext_csd is so large and mostly unused, we don't store the
 371          * raw block in mmc_card.
 372          */
 373         ext_csd = kzalloc(512, GFP_KERNEL);
 374         if (!ext_csd)
 375                 return -ENOMEM;
 376
 377         err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
 378                                 512);
 379         if (err)
 380                 kfree(ext_csd);
 381         else
 382                 *new_ext_csd = ext_csd;
 383
 384         return err;
 385 }
 386 EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
 387
 388 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
 389 {
 390         struct mmc_command cmd = {};
 391         int err;
 392
 393         cmd.opcode = MMC_SPI_READ_OCR;
 394         cmd.arg = highcap ? (1 << 30) : 0;
 395         cmd.flags = MMC_RSP_SPI_R3;
 396
 397         err = mmc_wait_for_cmd(host, &cmd, 0);
 398
 399         *ocrp = cmd.resp[1];
 400         return err;
 401 }
 402
 403 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
 404 {
 405         struct mmc_command cmd = {};
 406         int err;
 407
 408         cmd.opcode = MMC_SPI_CRC_ON_OFF;
 409         cmd.flags = MMC_RSP_SPI_R1;
 410         cmd.arg = use_crc;
 411
 412         err = mmc_wait_for_cmd(host, &cmd, 0);
 413         if (!err)
 414                 host->use_spi_crc = use_crc;
 415         return err;
 416 }
 417
 418 static int mmc_switch_status_error(struct mmc_host *host, u32 status)
 419 {
 420         if (mmc_host_is_spi(host)) {
 421                 if (status & R1_SPI_ILLEGAL_COMMAND)
 422                         return -EBADMSG;
 423         } else {
 424                 if (R1_STATUS(status))
 425                         pr_warn("%s: unexpected status %#x after switch\n",
 426                                 mmc_hostname(host), status);
 427                 if (status & R1_SWITCH_ERROR)
 428                         return -EBADMSG;
 429         }
 430         return 0;
 431 }
 432
 433 /* Caller must hold re-tuning */
 434 int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
 435 {
 436         u32 status;
 437         int err;
 438
 439         err = mmc_send_status(card, &status);
 440         if (!crc_err_fatal && err == -EILSEQ)
 441                 return 0;
 442         if (err)
 443                 return err;
 444
 445         return mmc_switch_status_error(card->host, status);
 446 }
 447
 448 int mmc_switch_status(struct mmc_card *card)
 449 {
 450         return __mmc_switch_status(card, true);
 451 }
 452
 453 static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
 454                         bool send_status, bool retry_crc_err)
 455 {
 456         struct mmc_host *host = card->host;
 457         int err;
 458         unsigned long timeout;
 459         u32 status = 0;
 460         bool expired = false;
 461         bool busy = false;
 462
 463         /*
 464          * In cases when not allowed to poll by using CMD13 or because we aren't
 465          * capable of polling by using ->card_busy(), then rely on waiting the
 466          * stated timeout to be sufficient.
 467          */
 468         if (!send_status && !host->ops->card_busy) {
 469                 mmc_delay(timeout_ms);
 470                 return 0;
 471         }
 472
 473         timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
 474         do {
 475                 /*
 476                  * Due to the possibility of being preempted while polling,
 477                  * check the expiration time first.
 478                  */
 479                 expired = time_after(jiffies, timeout);
 480
 481                 if (host->ops->card_busy) {
 482                         busy = host->ops->card_busy(host);
 483                 } else {
 484                         err = mmc_send_status(card, &status);
 485                         if (retry_crc_err && err == -EILSEQ) {
 486                                 busy = true;
 487                         } else if (err) {
 488                                 return err;
 489                         } else {
 490                                 err = mmc_switch_status_error(host, status);
 491                                 if (err)
 492                                         return err;
 493                                 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
 494                         }
 495                 }
 496
 497                 /* Timeout if the device still remains busy. */
 498                 if (expired && busy) {
 499                         pr_err("%s: Card stuck being busy! %s\n",
 500                                 mmc_hostname(host), __func__);
 501                         return -ETIMEDOUT;
 502                 }
 503         } while (busy);
 504
 505         return 0;
 506 }
 507
 508 /**
 509  *      __mmc_switch - modify EXT_CSD register
 510  *      @card: the MMC card associated with the data transfer
 511  *      @set: cmd set values
 512  *      @index: EXT_CSD register index
 513  *      @value: value to program into EXT_CSD register
 514  *      @timeout_ms: timeout (ms) for operation performed by register write,
 515  *                   timeout of zero implies maximum possible timeout
 516  *      @timing: new timing to change to
 517  *      @use_busy_signal: use the busy signal as response type
 518  *      @send_status: send status cmd to poll for busy
 519  *      @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
 520  *
 521  *      Modifies the EXT_CSD register for selected card.
 522  */
 523 int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 524                 unsigned int timeout_ms, unsigned char timing,
 525                 bool use_busy_signal, bool send_status, bool retry_crc_err)
 526 {
 527         struct mmc_host *host = card->host;
 528         int err;
 529         struct mmc_command cmd = {};
 530         bool use_r1b_resp = use_busy_signal;
 531         unsigned char old_timing = host->ios.timing;
 532
 533         mmc_retune_hold(host);
 534
 535         if (!timeout_ms) {
 536                 pr_warn("%s: unspecified timeout for CMD6 - use generic\n",
 537                         mmc_hostname(host));
 538                 timeout_ms = card->ext_csd.generic_cmd6_time;
 539         }
 540
 541         /*
 542          * If the max_busy_timeout of the host is specified, make sure it's
 543          * enough to fit the used timeout_ms. In case it's not, let's instruct
 544          * the host to avoid HW busy detection, by converting to a R1 response
 545          * instead of a R1B.
 546          */
 547         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 548                 use_r1b_resp = false;
 549
 550         cmd.opcode = MMC_SWITCH;
 551         cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 552                   (index << 16) |
 553                   (value << 8) |
 554                   set;
 555         cmd.flags = MMC_CMD_AC;
 556         if (use_r1b_resp) {
 557                 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
 558                 cmd.busy_timeout = timeout_ms;
 559         } else {
 560                 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
 561         }
 562
 563         if (index == EXT_CSD_SANITIZE_START)
 564                 cmd.sanitize_busy = true;
 565
 566         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 567         if (err)
 568                 goto out;
 569
 570         /* No need to check card status in case of unblocking command */
 571         if (!use_busy_signal)
 572                 goto out;
 573
 574         /*If SPI or used HW busy detection above, then we don't need to poll. */
 575         if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
 576                 mmc_host_is_spi(host))
 577                 goto out_tim;
 578
 579         /* Let's try to poll to find out when the command is completed. */
 580         err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
 581         if (err)
 582                 goto out;
 583
 584 out_tim:
 585         /* Switch to new timing before check switch status. */
 586         if (timing)
 587                 mmc_set_timing(host, timing);
 588
 589         if (send_status) {
 590                 err = mmc_switch_status(card);
 591                 if (err && timing)
 592                         mmc_set_timing(host, old_timing);
 593         }
 594 out:
 595         mmc_retune_release(host);
 596
 597         return err;
 598 }
 599
 600 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 601                 unsigned int timeout_ms)
 602 {
 603         return __mmc_switch(card, set, index, value, timeout_ms, 0,
 604                         true, true, false);
 605 }
 606 EXPORT_SYMBOL_GPL(mmc_switch);
 607
 608 int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
 609 {
 610         struct mmc_request mrq = {};
 611         struct mmc_command cmd = {};
 612         struct mmc_data data = {};
 613         struct scatterlist sg;
 614         struct mmc_ios *ios = &host->ios;
 615         const u8 *tuning_block_pattern;
 616         int size, err = 0;
 617         u8 *data_buf;
 618
 619         if (ios->bus_width == MMC_BUS_WIDTH_8) {
 620                 tuning_block_pattern = tuning_blk_pattern_8bit;
 621                 size = sizeof(tuning_blk_pattern_8bit);
 622         } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
 623                 tuning_block_pattern = tuning_blk_pattern_4bit;
 624                 size = sizeof(tuning_blk_pattern_4bit);
 625         } else
 626                 return -EINVAL;
 627
 628         data_buf = kzalloc(size, GFP_KERNEL);
 629         if (!data_buf)
 630                 return -ENOMEM;
 631
 632         mrq.cmd = &cmd;
 633         mrq.data = &data;
 634
 635         cmd.opcode = opcode;
 636         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
 637
 638         data.blksz = size;
 639         data.blocks = 1;
 640         data.flags = MMC_DATA_READ;
 641
 642         /*
 643          * According to the tuning specs, Tuning process
 644          * is normally shorter 40 executions of CMD19,
 645          * and timeout value should be shorter than 150 ms
 646          */
 647         data.timeout_ns = 150 * NSEC_PER_MSEC;
 648
 649         data.sg = &sg;
 650         data.sg_len = 1;
 651         sg_init_one(&sg, data_buf, size);
 652
 653         mmc_wait_for_req(host, &mrq);
 654
 655         if (cmd_error)
 656                 *cmd_error = cmd.error;
 657
 658         if (cmd.error) {
 659                 err = cmd.error;
 660                 goto out;
 661         }
 662
 663         if (data.error) {
 664                 err = data.error;
 665                 goto out;
 666         }
 667
 668         if (memcmp(data_buf, tuning_block_pattern, size))
 669                 err = -EIO;
 670
 671 out:
 672         kfree(data_buf);
 673         return err;
 674 }
 675 EXPORT_SYMBOL_GPL(mmc_send_tuning);
 676
 677 int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
 678 {
 679         struct mmc_command cmd = {};
 680
 681         /*
 682          * eMMC specification specifies that CMD12 can be used to stop a tuning
 683          * command, but SD specification does not, so do nothing unless it is
 684          * eMMC.
 685          */
 686         if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
 687                 return 0;
 688
 689         cmd.opcode = MMC_STOP_TRANSMISSION;
 690         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 691
 692         /*
 693          * For drivers that override R1 to R1b, set an arbitrary timeout based
 694          * on the tuning timeout i.e. 150ms.
 695          */
 696         cmd.busy_timeout = 150;
 697
 698         return mmc_wait_for_cmd(host, &cmd, 0);
 699 }
 700 EXPORT_SYMBOL_GPL(mmc_abort_tuning);
 701
 702 static int
 703 mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
 704                   u8 len)
 705 {
 706         struct mmc_request mrq = {};
 707         struct mmc_command cmd = {};
 708         struct mmc_data data = {};
 709         struct scatterlist sg;
 710         u8 *data_buf;
 711         u8 *test_buf;
 712         int i, err;
 713         static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
 714         static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
 715
 716         /* dma onto stack is unsafe/nonportable, but callers to this
 717          * routine normally provide temporary on-stack buffers ...
 718          */
 719         data_buf = kmalloc(len, GFP_KERNEL);
 720         if (!data_buf)
 721                 return -ENOMEM;
 722
 723         if (len == 8)
 724                 test_buf = testdata_8bit;
 725         else if (len == 4)
 726                 test_buf = testdata_4bit;
 727         else {
 728                 pr_err("%s: Invalid bus_width %d\n",
 729                        mmc_hostname(host), len);
 730                 kfree(data_buf);
 731                 return -EINVAL;
 732         }
 733
 734         if (opcode == MMC_BUS_TEST_W)
 735                 memcpy(data_buf, test_buf, len);
 736
 737         mrq.cmd = &cmd;
 738         mrq.data = &data;
 739         cmd.opcode = opcode;
 740         cmd.arg = 0;
 741
 742         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 743          * rely on callers to never use this with "native" calls for reading
 744          * CSD or CID.  Native versions of those commands use the R2 type,
 745          * not R1 plus a data block.
 746          */
 747         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 748
 749         data.blksz = len;
 750         data.blocks = 1;
 751         if (opcode == MMC_BUS_TEST_R)
 752                 data.flags = MMC_DATA_READ;
 753         else
 754                 data.flags = MMC_DATA_WRITE;
 755
 756         data.sg = &sg;
 757         data.sg_len = 1;
 758         mmc_set_data_timeout(&data, card);
 759         sg_init_one(&sg, data_buf, len);
 760         mmc_wait_for_req(host, &mrq);
 761         err = 0;
 762         if (opcode == MMC_BUS_TEST_R) {
 763                 for (i = 0; i < len / 4; i++)
 764                         if ((test_buf[i] ^ data_buf[i]) != 0xff) {
 765                                 err = -EIO;
 766                                 break;
 767                         }
 768         }
 769         kfree(data_buf);
 770
 771         if (cmd.error)
 772                 return cmd.error;
 773         if (data.error)
 774                 return data.error;
 775
 776         return err;
 777 }
 778
 779 int mmc_bus_test(struct mmc_card *card, u8 bus_width)
 780 {
 781         int width;
 782
 783         if (bus_width == MMC_BUS_WIDTH_8)
 784                 width = 8;
 785         else if (bus_width == MMC_BUS_WIDTH_4)
 786                 width = 4;
 787         else if (bus_width == MMC_BUS_WIDTH_1)
 788                 return 0; /* no need for test */
 789         else
 790                 return -EINVAL;
 791
 792         /*
 793          * Ignore errors from BUS_TEST_W.  BUS_TEST_R will fail if there
 794          * is a problem.  This improves chances that the test will work.
 795          */
 796         mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
 797         return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
 798 }
 799
 800 static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
 801 {
 802         struct mmc_command cmd = {};
 803         unsigned int opcode;
 804         int err;
 805
 806         opcode = card->ext_csd.hpi_cmd;
 807         if (opcode == MMC_STOP_TRANSMISSION)
 808                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
 809         else if (opcode == MMC_SEND_STATUS)
 810                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 811
 812         cmd.opcode = opcode;
 813         cmd.arg = card->rca << 16 | 1;
 814
 815         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 816         if (err) {
 817                 pr_warn("%s: error %d interrupting operation. "
 818                         "HPI command response %#x\n", mmc_hostname(card->host),
 819                         err, cmd.resp[0]);
 820                 return err;
 821         }
 822         if (status)
 823                 *status = cmd.resp[0];
 824
 825         return 0;
 826 }
 827
 828 /**
 829  *      mmc_interrupt_hpi - Issue for High priority Interrupt
 830  *      @card: the MMC card associated with the HPI transfer
 831  *
 832  *      Issued High Priority Interrupt, and check for card status
 833  *      until out-of prg-state.
 834  */
 835 int mmc_interrupt_hpi(struct mmc_card *card)
 836 {
 837         int err;
 838         u32 status;
 839         unsigned long prg_wait;
 840
 841         if (!card->ext_csd.hpi_en) {
 842                 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
 843                 return 1;
 844         }
 845
 846         err = mmc_send_status(card, &status);
 847         if (err) {
 848                 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
 849                 goto out;
 850         }
 851
 852         switch (R1_CURRENT_STATE(status)) {
 853         case R1_STATE_IDLE:
 854         case R1_STATE_READY:
 855         case R1_STATE_STBY:
 856         case R1_STATE_TRAN:
 857                 /*
 858                  * In idle and transfer states, HPI is not needed and the caller
 859                  * can issue the next intended command immediately
 860                  */
 861                 goto out;
 862         case R1_STATE_PRG:
 863                 break;
 864         default:
 865                 /* In all other states, it's illegal to issue HPI */
 866                 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
 867                         mmc_hostname(card->host), R1_CURRENT_STATE(status));
 868                 err = -EINVAL;
 869                 goto out;
 870         }
 871
 872         err = mmc_send_hpi_cmd(card, &status);
 873         if (err)
 874                 goto out;
 875
 876         prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
 877         do {
 878                 err = mmc_send_status(card, &status);
 879
 880                 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
 881                         break;
 882                 if (time_after(jiffies, prg_wait))
 883                         err = -ETIMEDOUT;
 884         } while (!err);
 885
 886 out:
 887         return err;
 888 }
 889
 890 int mmc_can_ext_csd(struct mmc_card *card)
 891 {
 892         return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
 893 }
 894
 895 static int mmc_read_bkops_status(struct mmc_card *card)
 896 {
 897         int err;
 898         u8 *ext_csd;
 899
 900         err = mmc_get_ext_csd(card, &ext_csd);
 901         if (err)
 902                 return err;
 903
 904         card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
 905         card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
 906         kfree(ext_csd);
 907         return 0;
 908 }
 909
 910 /**
 911  *      mmc_run_bkops - Run BKOPS for supported cards
 912  *      @card: MMC card to run BKOPS for
 913  *
 914  *      Run background operations synchronously for cards having manual BKOPS
 915  *      enabled and in case it reports urgent BKOPS level.
 916 */
 917 void mmc_run_bkops(struct mmc_card *card)
 918 {
 919         int err;
 920
 921         if (!card->ext_csd.man_bkops_en)
 922                 return;
 923
 924         err = mmc_read_bkops_status(card);
 925         if (err) {
 926                 pr_err("%s: Failed to read bkops status: %d\n",
 927                        mmc_hostname(card->host), err);
 928                 return;
 929         }
 930
 931         if (!card->ext_csd.raw_bkops_status ||
 932             card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
 933                 return;
 934
 935         mmc_retune_hold(card->host);
 936
 937         /*
 938          * For urgent BKOPS status, LEVEL_2 and higher, let's execute
 939          * synchronously. Future wise, we may consider to start BKOPS, for less
 940          * urgent levels by using an asynchronous background task, when idle.
 941          */
 942         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 943                          EXT_CSD_BKOPS_START, 1, MMC_BKOPS_TIMEOUT_MS);
 944         if (err)
 945                 pr_warn("%s: Error %d starting bkops\n",
 946                         mmc_hostname(card->host), err);
 947
 948         mmc_retune_release(card->host);
 949 }
 950 EXPORT_SYMBOL(mmc_run_bkops);
 951
 952 /*
 953  * Flush the cache to the non-volatile storage.
 954  */
 955 int mmc_flush_cache(struct mmc_card *card)
 956 {
 957         int err = 0;
 958
 959         if (mmc_card_mmc(card) &&
 960                         (card->ext_csd.cache_size > 0) &&
 961                         (card->ext_csd.cache_ctrl & 1)) {
 962                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 963                                  EXT_CSD_FLUSH_CACHE, 1,
 964                                  MMC_CACHE_FLUSH_TIMEOUT_MS);
 965                 if (err)
 966                         pr_err("%s: cache flush error %d\n",
 967                                         mmc_hostname(card->host), err);
 968         }
 969
 970         return err;
 971 }
 972 EXPORT_SYMBOL(mmc_flush_cache);
 973
 974 static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
 975 {
 976         u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
 977         int err;
 978
 979         if (!card->ext_csd.cmdq_support)
 980                 return -EOPNOTSUPP;
 981
 982         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
 983                          val, card->ext_csd.generic_cmd6_time);
 984         if (!err)
 985                 card->ext_csd.cmdq_en = enable;
 986
 987         return err;
 988 }
 989
 990 int mmc_cmdq_enable(struct mmc_card *card)
 991 {
 992         return mmc_cmdq_switch(card, true);
 993 }
 994 EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
 995
 996 int mmc_cmdq_disable(struct mmc_card *card)
 997 {
 998         return mmc_cmdq_switch(card, false);
 999 }
1000 EXPORT_SYMBOL_GPL(mmc_cmdq_disable);