drivers/mmc/core/mmc_ops.c

   1 /*
   2  *  linux/drivers/mmc/core/mmc_ops.h
   3  *
   4  *  Copyright 2006-2007 Pierre Ossman
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at
   9  * your option) any later version.
  10  */
  11
  12 #include <linux/slab.h>
  13 #include <linux/export.h>
  14 #include <linux/types.h>
  15 #include <linux/scatterlist.h>
  16
  17 #include <linux/mmc/host.h>
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/mmc.h>
  20
  21 #include "core.h"
  22 #include "host.h"
  23 #include "mmc_ops.h"
  24
  25 #define MMC_OPS_TIMEOUT_MS      (10 * 60 * 1000) /* 10 minute timeout */
  26
  27 static const u8 tuning_blk_pattern_4bit[] = {
  28         0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
  29         0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
  30         0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
  31         0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
  32         0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
  33         0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
  34         0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
  35         0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
  36 };
  37
  38 static const u8 tuning_blk_pattern_8bit[] = {
  39         0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
  40         0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
  41         0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
  42         0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
  43         0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
  44         0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
  45         0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
  46         0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
  47         0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
  48         0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
  49         0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
  50         0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
  51         0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
  52         0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
  53         0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
  54         0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
  55 };
  56
  57 int mmc_send_status(struct mmc_card *card, u32 *status)
  58 {
  59         int err;
  60         struct mmc_command cmd = {0};
  61
  62         cmd.opcode = MMC_SEND_STATUS;
  63         if (!mmc_host_is_spi(card->host))
  64                 cmd.arg = card->rca << 16;
  65         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
  66
  67         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
  68         if (err)
  69                 return err;
  70
  71         /* NOTE: callers are required to understand the difference
  72          * between "native" and SPI format status words!
  73          */
  74         if (status)
  75                 *status = cmd.resp[0];
  76
  77         return 0;
  78 }
  79
  80 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
  81 {
  82         struct mmc_command cmd = {0};
  83
  84         cmd.opcode = MMC_SELECT_CARD;
  85
  86         if (card) {
  87                 cmd.arg = card->rca << 16;
  88                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
  89         } else {
  90                 cmd.arg = 0;
  91                 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
  92         }
  93
  94         return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  95 }
  96
  97 int mmc_select_card(struct mmc_card *card)
  98 {
  99
 100         return _mmc_select_card(card->host, card);
 101 }
 102
 103 int mmc_deselect_cards(struct mmc_host *host)
 104 {
 105         return _mmc_select_card(host, NULL);
 106 }
 107
 108 /*
 109  * Write the value specified in the device tree or board code into the optional
 110  * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
 111  * drive strength of the DAT and CMD outputs. The actual meaning of a given
 112  * value is hardware dependant.
 113  * The presence of the DSR register can be determined from the CSD register,
 114  * bit 76.
 115  */
 116 int mmc_set_dsr(struct mmc_host *host)
 117 {
 118         struct mmc_command cmd = {0};
 119
 120         cmd.opcode = MMC_SET_DSR;
 121
 122         cmd.arg = (host->dsr << 16) | 0xffff;
 123         cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
 124
 125         return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 126 }
 127
 128 int mmc_go_idle(struct mmc_host *host)
 129 {
 130         int err;
 131         struct mmc_command cmd = {0};
 132
 133         /*
 134          * Non-SPI hosts need to prevent chipselect going active during
 135          * GO_IDLE; that would put chips into SPI mode.  Remind them of
 136          * that in case of hardware that won't pull up DAT3/nCS otherwise.
 137          *
 138          * SPI hosts ignore ios.chip_select; it's managed according to
 139          * rules that must accommodate non-MMC slaves which this layer
 140          * won't even know about.
 141          */
 142         if (!mmc_host_is_spi(host)) {
 143                 mmc_set_chip_select(host, MMC_CS_HIGH);
 144                 mmc_delay(1);
 145         }
 146
 147         cmd.opcode = MMC_GO_IDLE_STATE;
 148         cmd.arg = 0;
 149         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
 150
 151         err = mmc_wait_for_cmd(host, &cmd, 0);
 152
 153         mmc_delay(1);
 154
 155         if (!mmc_host_is_spi(host)) {
 156                 mmc_set_chip_select(host, MMC_CS_DONTCARE);
 157                 mmc_delay(1);
 158         }
 159
 160         host->use_spi_crc = 0;
 161
 162         return err;
 163 }
 164
 165 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 166 {
 167         struct mmc_command cmd = {0};
 168         int i, err = 0;
 169
 170         cmd.opcode = MMC_SEND_OP_COND;
 171         cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
 172         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 173
 174         for (i = 100; i; i--) {
 175                 err = mmc_wait_for_cmd(host, &cmd, 0);
 176                 if (err)
 177                         break;
 178
 179                 /* if we're just probing, do a single pass */
 180                 if (ocr == 0)
 181                         break;
 182
 183                 /* otherwise wait until reset completes */
 184                 if (mmc_host_is_spi(host)) {
 185                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 186                                 break;
 187                 } else {
 188                         if (cmd.resp[0] & MMC_CARD_BUSY)
 189                                 break;
 190                 }
 191
 192                 err = -ETIMEDOUT;
 193
 194                 mmc_delay(10);
 195         }
 196
 197         if (rocr && !mmc_host_is_spi(host))
 198                 *rocr = cmd.resp[0];
 199
 200         return err;
 201 }
 202
 203 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
 204 {
 205         int err;
 206         struct mmc_command cmd = {0};
 207
 208         cmd.opcode = MMC_ALL_SEND_CID;
 209         cmd.arg = 0;
 210         cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
 211
 212         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 213         if (err)
 214                 return err;
 215
 216         memcpy(cid, cmd.resp, sizeof(u32) * 4);
 217
 218         return 0;
 219 }
 220
 221 int mmc_set_relative_addr(struct mmc_card *card)
 222 {
 223         struct mmc_command cmd = {0};
 224
 225         cmd.opcode = MMC_SET_RELATIVE_ADDR;
 226         cmd.arg = card->rca << 16;
 227         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 228
 229         return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 230 }
 231
 232 static int
 233 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
 234 {
 235         int err;
 236         struct mmc_command cmd = {0};
 237
 238         cmd.opcode = opcode;
 239         cmd.arg = arg;
 240         cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
 241
 242         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 243         if (err)
 244                 return err;
 245
 246         memcpy(cxd, cmd.resp, sizeof(u32) * 4);
 247
 248         return 0;
 249 }
 250
 251 /*
 252  * NOTE: void *buf, caller for the buf is required to use DMA-capable
 253  * buffer or on-stack buffer (with some overhead in callee).
 254  */
 255 static int
 256 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 257                 u32 opcode, void *buf, unsigned len)
 258 {
 259         struct mmc_request mrq = {NULL};
 260         struct mmc_command cmd = {0};
 261         struct mmc_data data = {0};
 262         struct scatterlist sg;
 263
 264         mrq.cmd = &cmd;
 265         mrq.data = &data;
 266
 267         cmd.opcode = opcode;
 268         cmd.arg = 0;
 269
 270         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 271          * rely on callers to never use this with "native" calls for reading
 272          * CSD or CID.  Native versions of those commands use the R2 type,
 273          * not R1 plus a data block.
 274          */
 275         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 276
 277         data.blksz = len;
 278         data.blocks = 1;
 279         data.flags = MMC_DATA_READ;
 280         data.sg = &sg;
 281         data.sg_len = 1;
 282
 283         sg_init_one(&sg, buf, len);
 284
 285         if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
 286                 /*
 287                  * The spec states that CSR and CID accesses have a timeout
 288                  * of 64 clock cycles.
 289                  */
 290                 data.timeout_ns = 0;
 291                 data.timeout_clks = 64;
 292         } else
 293                 mmc_set_data_timeout(&data, card);
 294
 295         mmc_wait_for_req(host, &mrq);
 296
 297         if (cmd.error)
 298                 return cmd.error;
 299         if (data.error)
 300                 return data.error;
 301
 302         return 0;
 303 }
 304
 305 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 306 {
 307         int ret, i;
 308         u32 *csd_tmp;
 309
 310         if (!mmc_host_is_spi(card->host))
 311                 return mmc_send_cxd_native(card->host, card->rca << 16,
 312                                 csd, MMC_SEND_CSD);
 313
 314         csd_tmp = kzalloc(16, GFP_KERNEL);
 315         if (!csd_tmp)
 316                 return -ENOMEM;
 317
 318         ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
 319         if (ret)
 320                 goto err;
 321
 322         for (i = 0;i < 4;i++)
 323                 csd[i] = be32_to_cpu(csd_tmp[i]);
 324
 325 err:
 326         kfree(csd_tmp);
 327         return ret;
 328 }
 329
 330 int mmc_send_cid(struct mmc_host *host, u32 *cid)
 331 {
 332         int ret, i;
 333         u32 *cid_tmp;
 334
 335         if (!mmc_host_is_spi(host)) {
 336                 if (!host->card)
 337                         return -EINVAL;
 338                 return mmc_send_cxd_native(host, host->card->rca << 16,
 339                                 cid, MMC_SEND_CID);
 340         }
 341
 342         cid_tmp = kzalloc(16, GFP_KERNEL);
 343         if (!cid_tmp)
 344                 return -ENOMEM;
 345
 346         ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
 347         if (ret)
 348                 goto err;
 349
 350         for (i = 0;i < 4;i++)
 351                 cid[i] = be32_to_cpu(cid_tmp[i]);
 352
 353 err:
 354         kfree(cid_tmp);
 355         return ret;
 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 = {0};
 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 = {0};
 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 (status & 0xFDFFA000)
 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         /* We have an unspecified cmd timeout, use the fallback value. */
 464         if (!timeout_ms)
 465                 timeout_ms = MMC_OPS_TIMEOUT_MS;
 466
 467         /*
 468          * In cases when not allowed to poll by using CMD13 or because we aren't
 469          * capable of polling by using ->card_busy(), then rely on waiting the
 470          * stated timeout to be sufficient.
 471          */
 472         if (!send_status && !host->ops->card_busy) {
 473                 mmc_delay(timeout_ms);
 474                 return 0;
 475         }
 476
 477         timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
 478         do {
 479                 /*
 480                  * Due to the possibility of being preempted while polling,
 481                  * check the expiration time first.
 482                  */
 483                 expired = time_after(jiffies, timeout);
 484
 485                 if (host->ops->card_busy) {
 486                         busy = host->ops->card_busy(host);
 487                 } else {
 488                         err = mmc_send_status(card, &status);
 489                         if (retry_crc_err && err == -EILSEQ) {
 490                                 busy = true;
 491                         } else if (err) {
 492                                 return err;
 493                         } else {
 494                                 err = mmc_switch_status_error(host, status);
 495                                 if (err)
 496                                         return err;
 497                                 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
 498                         }
 499                 }
 500
 501                 /* Timeout if the device still remains busy. */
 502                 if (expired && busy) {
 503                         pr_err("%s: Card stuck being busy! %s\n",
 504                                 mmc_hostname(host), __func__);
 505                         return -ETIMEDOUT;
 506                 }
 507         } while (busy);
 508
 509         return 0;
 510 }
 511
 512 /**
 513  *      __mmc_switch - modify EXT_CSD register
 514  *      @card: the MMC card associated with the data transfer
 515  *      @set: cmd set values
 516  *      @index: EXT_CSD register index
 517  *      @value: value to program into EXT_CSD register
 518  *      @timeout_ms: timeout (ms) for operation performed by register write,
 519  *                   timeout of zero implies maximum possible timeout
 520  *      @timing: new timing to change to
 521  *      @use_busy_signal: use the busy signal as response type
 522  *      @send_status: send status cmd to poll for busy
 523  *      @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
 524  *
 525  *      Modifies the EXT_CSD register for selected card.
 526  */
 527 int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 528                 unsigned int timeout_ms, unsigned char timing,
 529                 bool use_busy_signal, bool send_status, bool retry_crc_err)
 530 {
 531         struct mmc_host *host = card->host;
 532         int err;
 533         struct mmc_command cmd = {0};
 534         bool use_r1b_resp = use_busy_signal;
 535         unsigned char old_timing = host->ios.timing;
 536
 537         mmc_retune_hold(host);
 538
 539         /*
 540          * If the cmd timeout and the max_busy_timeout of the host are both
 541          * specified, let's validate them. A failure means we need to prevent
 542          * the host from doing hw busy detection, which is done by converting
 543          * to a R1 response instead of a R1B.
 544          */
 545         if (timeout_ms && host->max_busy_timeout &&
 546                 (timeout_ms > host->max_busy_timeout))
 547                 use_r1b_resp = false;
 548
 549         cmd.opcode = MMC_SWITCH;
 550         cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 551                   (index << 16) |
 552                   (value << 8) |
 553                   set;
 554         cmd.flags = MMC_CMD_AC;
 555         if (use_r1b_resp) {
 556                 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
 557                 /*
 558                  * A busy_timeout of zero means the host can decide to use
 559                  * whatever value it finds suitable.
 560                  */
 561                 cmd.busy_timeout = timeout_ms;
 562         } else {
 563                 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
 564         }
 565
 566         if (index == EXT_CSD_SANITIZE_START)
 567                 cmd.sanitize_busy = true;
 568
 569         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 570         if (err)
 571                 goto out;
 572
 573         /* No need to check card status in case of unblocking command */
 574         if (!use_busy_signal)
 575                 goto out;
 576
 577         /*If SPI or used HW busy detection above, then we don't need to poll. */
 578         if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
 579                 mmc_host_is_spi(host))
 580                 goto out_tim;
 581
 582         /* Let's try to poll to find out when the command is completed. */
 583         err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
 584         if (err)
 585                 goto out;
 586
 587 out_tim:
 588         /* Switch to new timing before check switch status. */
 589         if (timing)
 590                 mmc_set_timing(host, timing);
 591
 592         if (send_status) {
 593                 err = mmc_switch_status(card);
 594                 if (err && timing)
 595                         mmc_set_timing(host, old_timing);
 596         }
 597 out:
 598         mmc_retune_release(host);
 599
 600         return err;
 601 }
 602
 603 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 604                 unsigned int timeout_ms)
 605 {
 606         return __mmc_switch(card, set, index, value, timeout_ms, 0,
 607                         true, true, false);
 608 }
 609 EXPORT_SYMBOL_GPL(mmc_switch);
 610
 611 int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
 612 {
 613         struct mmc_request mrq = {NULL};
 614         struct mmc_command cmd = {0};
 615         struct mmc_data data = {0};
 616         struct scatterlist sg;
 617         struct mmc_ios *ios = &host->ios;
 618         const u8 *tuning_block_pattern;
 619         int size, err = 0;
 620         u8 *data_buf;
 621
 622         if (ios->bus_width == MMC_BUS_WIDTH_8) {
 623                 tuning_block_pattern = tuning_blk_pattern_8bit;
 624                 size = sizeof(tuning_blk_pattern_8bit);
 625         } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
 626                 tuning_block_pattern = tuning_blk_pattern_4bit;
 627                 size = sizeof(tuning_blk_pattern_4bit);
 628         } else
 629                 return -EINVAL;
 630
 631         data_buf = kzalloc(size, GFP_KERNEL);
 632         if (!data_buf)
 633                 return -ENOMEM;
 634
 635         mrq.cmd = &cmd;
 636         mrq.data = &data;
 637
 638         cmd.opcode = opcode;
 639         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
 640
 641         data.blksz = size;
 642         data.blocks = 1;
 643         data.flags = MMC_DATA_READ;
 644
 645         /*
 646          * According to the tuning specs, Tuning process
 647          * is normally shorter 40 executions of CMD19,
 648          * and timeout value should be shorter than 150 ms
 649          */
 650         data.timeout_ns = 150 * NSEC_PER_MSEC;
 651
 652         data.sg = &sg;
 653         data.sg_len = 1;
 654         sg_init_one(&sg, data_buf, size);
 655
 656         mmc_wait_for_req(host, &mrq);
 657
 658         if (cmd_error)
 659                 *cmd_error = cmd.error;
 660
 661         if (cmd.error) {
 662                 err = cmd.error;
 663                 goto out;
 664         }
 665
 666         if (data.error) {
 667                 err = data.error;
 668                 goto out;
 669         }
 670
 671         if (memcmp(data_buf, tuning_block_pattern, size))
 672                 err = -EIO;
 673
 674 out:
 675         kfree(data_buf);
 676         return err;
 677 }
 678 EXPORT_SYMBOL_GPL(mmc_send_tuning);
 679
 680 int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
 681 {
 682         struct mmc_command cmd = {0};
 683
 684         /*
 685          * eMMC specification specifies that CMD12 can be used to stop a tuning
 686          * command, but SD specification does not, so do nothing unless it is
 687          * eMMC.
 688          */
 689         if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
 690                 return 0;
 691
 692         cmd.opcode = MMC_STOP_TRANSMISSION;
 693         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 694
 695         /*
 696          * For drivers that override R1 to R1b, set an arbitrary timeout based
 697          * on the tuning timeout i.e. 150ms.
 698          */
 699         cmd.busy_timeout = 150;
 700
 701         return mmc_wait_for_cmd(host, &cmd, 0);
 702 }
 703 EXPORT_SYMBOL_GPL(mmc_abort_tuning);
 704
 705 static int
 706 mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
 707                   u8 len)
 708 {
 709         struct mmc_request mrq = {NULL};
 710         struct mmc_command cmd = {0};
 711         struct mmc_data data = {0};
 712         struct scatterlist sg;
 713         u8 *data_buf;
 714         u8 *test_buf;
 715         int i, err;
 716         static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
 717         static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
 718
 719         /* dma onto stack is unsafe/nonportable, but callers to this
 720          * routine normally provide temporary on-stack buffers ...
 721          */
 722         data_buf = kmalloc(len, GFP_KERNEL);
 723         if (!data_buf)
 724                 return -ENOMEM;
 725
 726         if (len == 8)
 727                 test_buf = testdata_8bit;
 728         else if (len == 4)
 729                 test_buf = testdata_4bit;
 730         else {
 731                 pr_err("%s: Invalid bus_width %d\n",
 732                        mmc_hostname(host), len);
 733                 kfree(data_buf);
 734                 return -EINVAL;
 735         }
 736
 737         if (opcode == MMC_BUS_TEST_W)
 738                 memcpy(data_buf, test_buf, len);
 739
 740         mrq.cmd = &cmd;
 741         mrq.data = &data;
 742         cmd.opcode = opcode;
 743         cmd.arg = 0;
 744
 745         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 746          * rely on callers to never use this with "native" calls for reading
 747          * CSD or CID.  Native versions of those commands use the R2 type,
 748          * not R1 plus a data block.
 749          */
 750         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 751
 752         data.blksz = len;
 753         data.blocks = 1;
 754         if (opcode == MMC_BUS_TEST_R)
 755                 data.flags = MMC_DATA_READ;
 756         else
 757                 data.flags = MMC_DATA_WRITE;
 758
 759         data.sg = &sg;
 760         data.sg_len = 1;
 761         mmc_set_data_timeout(&data, card);
 762         sg_init_one(&sg, data_buf, len);
 763         mmc_wait_for_req(host, &mrq);
 764         err = 0;
 765         if (opcode == MMC_BUS_TEST_R) {
 766                 for (i = 0; i < len / 4; i++)
 767                         if ((test_buf[i] ^ data_buf[i]) != 0xff) {
 768                                 err = -EIO;
 769                                 break;
 770                         }
 771         }
 772         kfree(data_buf);
 773
 774         if (cmd.error)
 775                 return cmd.error;
 776         if (data.error)
 777                 return data.error;
 778
 779         return err;
 780 }
 781
 782 int mmc_bus_test(struct mmc_card *card, u8 bus_width)
 783 {
 784         int width;
 785
 786         if (bus_width == MMC_BUS_WIDTH_8)
 787                 width = 8;
 788         else if (bus_width == MMC_BUS_WIDTH_4)
 789                 width = 4;
 790         else if (bus_width == MMC_BUS_WIDTH_1)
 791                 return 0; /* no need for test */
 792         else
 793                 return -EINVAL;
 794
 795         /*
 796          * Ignore errors from BUS_TEST_W.  BUS_TEST_R will fail if there
 797          * is a problem.  This improves chances that the test will work.
 798          */
 799         mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
 800         return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
 801 }
 802
 803 int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
 804 {
 805         struct mmc_command cmd = {0};
 806         unsigned int opcode;
 807         int err;
 808
 809         if (!card->ext_csd.hpi) {
 810                 pr_warn("%s: Card didn't support HPI command\n",
 811                         mmc_hostname(card->host));
 812                 return -EINVAL;
 813         }
 814
 815         opcode = card->ext_csd.hpi_cmd;
 816         if (opcode == MMC_STOP_TRANSMISSION)
 817                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
 818         else if (opcode == MMC_SEND_STATUS)
 819                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 820
 821         cmd.opcode = opcode;
 822         cmd.arg = card->rca << 16 | 1;
 823
 824         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 825         if (err) {
 826                 pr_warn("%s: error %d interrupting operation. "
 827                         "HPI command response %#x\n", mmc_hostname(card->host),
 828                         err, cmd.resp[0]);
 829                 return err;
 830         }
 831         if (status)
 832                 *status = cmd.resp[0];
 833
 834         return 0;
 835 }
 836
 837 int mmc_can_ext_csd(struct mmc_card *card)
 838 {
 839         return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
 840 }