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 "mmc_ops.h"
  23
  24 #define MMC_OPS_TIMEOUT_MS      (10 * 60 * 1000) /* 10 minute timeout */
  25
  26 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
  27 {
  28         int err;
  29         struct mmc_command cmd = {0};
  30
  31         BUG_ON(!host);
  32
  33         cmd.opcode = MMC_SELECT_CARD;
  34
  35         if (card) {
  36                 cmd.arg = card->rca << 16;
  37                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
  38         } else {
  39                 cmd.arg = 0;
  40                 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
  41         }
  42
  43         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  44         if (err)
  45                 return err;
  46
  47         return 0;
  48 }
  49
  50 int mmc_select_card(struct mmc_card *card)
  51 {
  52         BUG_ON(!card);
  53
  54         return _mmc_select_card(card->host, card);
  55 }
  56
  57 int mmc_deselect_cards(struct mmc_host *host)
  58 {
  59         return _mmc_select_card(host, NULL);
  60 }
  61
  62 int mmc_card_sleepawake(struct mmc_host *host, int sleep)
  63 {
  64         struct mmc_command cmd = {0};
  65         struct mmc_card *card = host->card;
  66         int err;
  67
  68         if (sleep)
  69                 mmc_deselect_cards(host);
  70
  71         cmd.opcode = MMC_SLEEP_AWAKE;
  72         cmd.arg = card->rca << 16;
  73         if (sleep)
  74                 cmd.arg |= 1 << 15;
  75
  76         cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
  77         err = mmc_wait_for_cmd(host, &cmd, 0);
  78         if (err)
  79                 return err;
  80
  81         /*
  82          * If the host does not wait while the card signals busy, then we will
  83          * will have to wait the sleep/awake timeout.  Note, we cannot use the
  84          * SEND_STATUS command to poll the status because that command (and most
  85          * others) is invalid while the card sleeps.
  86          */
  87         if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
  88                 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
  89
  90         if (!sleep)
  91                 err = mmc_select_card(card);
  92
  93         return err;
  94 }
  95
  96 int mmc_go_idle(struct mmc_host *host)
  97 {
  98         int err;
  99         struct mmc_command cmd = {0};
 100
 101         /*
 102          * Non-SPI hosts need to prevent chipselect going active during
 103          * GO_IDLE; that would put chips into SPI mode.  Remind them of
 104          * that in case of hardware that won't pull up DAT3/nCS otherwise.
 105          *
 106          * SPI hosts ignore ios.chip_select; it's managed according to
 107          * rules that must accommodate non-MMC slaves which this layer
 108          * won't even know about.
 109          */
 110         if (!mmc_host_is_spi(host)) {
 111                 mmc_set_chip_select(host, MMC_CS_HIGH);
 112                 mmc_delay(1);
 113         }
 114
 115         cmd.opcode = MMC_GO_IDLE_STATE;
 116         cmd.arg = 0;
 117         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
 118
 119         err = mmc_wait_for_cmd(host, &cmd, 0);
 120
 121         mmc_delay(1);
 122
 123         if (!mmc_host_is_spi(host)) {
 124                 mmc_set_chip_select(host, MMC_CS_DONTCARE);
 125                 mmc_delay(1);
 126         }
 127
 128         host->use_spi_crc = 0;
 129
 130         return err;
 131 }
 132
 133 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 134 {
 135         struct mmc_command cmd = {0};
 136         int i, err = 0;
 137
 138         BUG_ON(!host);
 139
 140         cmd.opcode = MMC_SEND_OP_COND;
 141         cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
 142         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 143
 144         for (i = 100; i; i--) {
 145                 err = mmc_wait_for_cmd(host, &cmd, 0);
 146                 if (err)
 147                         break;
 148
 149                 /* if we're just probing, do a single pass */
 150                 if (ocr == 0)
 151                         break;
 152
 153                 /* otherwise wait until reset completes */
 154                 if (mmc_host_is_spi(host)) {
 155                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 156                                 break;
 157                 } else {
 158                         if (cmd.resp[0] & MMC_CARD_BUSY)
 159                                 break;
 160                 }
 161
 162                 err = -ETIMEDOUT;
 163
 164                 mmc_delay(10);
 165         }
 166
 167         if (rocr && !mmc_host_is_spi(host))
 168                 *rocr = cmd.resp[0];
 169
 170         return err;
 171 }
 172
 173 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
 174 {
 175         int err;
 176         struct mmc_command cmd = {0};
 177
 178         BUG_ON(!host);
 179         BUG_ON(!cid);
 180
 181         cmd.opcode = MMC_ALL_SEND_CID;
 182         cmd.arg = 0;
 183         cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
 184
 185         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 186         if (err)
 187                 return err;
 188
 189         memcpy(cid, cmd.resp, sizeof(u32) * 4);
 190
 191         return 0;
 192 }
 193
 194 int mmc_set_relative_addr(struct mmc_card *card)
 195 {
 196         int err;
 197         struct mmc_command cmd = {0};
 198
 199         BUG_ON(!card);
 200         BUG_ON(!card->host);
 201
 202         cmd.opcode = MMC_SET_RELATIVE_ADDR;
 203         cmd.arg = card->rca << 16;
 204         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 205
 206         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 207         if (err)
 208                 return err;
 209
 210         return 0;
 211 }
 212
 213 static int
 214 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
 215 {
 216         int err;
 217         struct mmc_command cmd = {0};
 218
 219         BUG_ON(!host);
 220         BUG_ON(!cxd);
 221
 222         cmd.opcode = opcode;
 223         cmd.arg = arg;
 224         cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
 225
 226         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 227         if (err)
 228                 return err;
 229
 230         memcpy(cxd, cmd.resp, sizeof(u32) * 4);
 231
 232         return 0;
 233 }
 234
 235 /*
 236  * NOTE: void *buf, caller for the buf is required to use DMA-capable
 237  * buffer or on-stack buffer (with some overhead in callee).
 238  */
 239 static int
 240 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 241                 u32 opcode, void *buf, unsigned len)
 242 {
 243         struct mmc_request mrq = {NULL};
 244         struct mmc_command cmd = {0};
 245         struct mmc_data data = {0};
 246         struct scatterlist sg;
 247         void *data_buf;
 248         int is_on_stack;
 249
 250         is_on_stack = object_is_on_stack(buf);
 251         if (is_on_stack) {
 252                 /*
 253                  * dma onto stack is unsafe/nonportable, but callers to this
 254                  * routine normally provide temporary on-stack buffers ...
 255                  */
 256                 data_buf = kmalloc(len, GFP_KERNEL);
 257                 if (!data_buf)
 258                         return -ENOMEM;
 259         } else
 260                 data_buf = buf;
 261
 262         mrq.cmd = &cmd;
 263         mrq.data = &data;
 264
 265         cmd.opcode = opcode;
 266         cmd.arg = 0;
 267
 268         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 269          * rely on callers to never use this with "native" calls for reading
 270          * CSD or CID.  Native versions of those commands use the R2 type,
 271          * not R1 plus a data block.
 272          */
 273         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 274
 275         data.blksz = len;
 276         data.blocks = 1;
 277         data.flags = MMC_DATA_READ;
 278         data.sg = &sg;
 279         data.sg_len = 1;
 280
 281         sg_init_one(&sg, data_buf, len);
 282
 283         if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
 284                 /*
 285                  * The spec states that CSR and CID accesses have a timeout
 286                  * of 64 clock cycles.
 287                  */
 288                 data.timeout_ns = 0;
 289                 data.timeout_clks = 64;
 290         } else
 291                 mmc_set_data_timeout(&data, card);
 292
 293         mmc_wait_for_req(host, &mrq);
 294
 295         if (is_on_stack) {
 296                 memcpy(buf, data_buf, len);
 297                 kfree(data_buf);
 298         }
 299
 300         if (cmd.error)
 301                 return cmd.error;
 302         if (data.error)
 303                 return data.error;
 304
 305         return 0;
 306 }
 307
 308 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 309 {
 310         int ret, i;
 311         u32 *csd_tmp;
 312
 313         if (!mmc_host_is_spi(card->host))
 314                 return mmc_send_cxd_native(card->host, card->rca << 16,
 315                                 csd, MMC_SEND_CSD);
 316
 317         csd_tmp = kmalloc(16, GFP_KERNEL);
 318         if (!csd_tmp)
 319                 return -ENOMEM;
 320
 321         ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
 322         if (ret)
 323                 goto err;
 324
 325         for (i = 0;i < 4;i++)
 326                 csd[i] = be32_to_cpu(csd_tmp[i]);
 327
 328 err:
 329         kfree(csd_tmp);
 330         return ret;
 331 }
 332
 333 int mmc_send_cid(struct mmc_host *host, u32 *cid)
 334 {
 335         int ret, i;
 336         u32 *cid_tmp;
 337
 338         if (!mmc_host_is_spi(host)) {
 339                 if (!host->card)
 340                         return -EINVAL;
 341                 return mmc_send_cxd_native(host, host->card->rca << 16,
 342                                 cid, MMC_SEND_CID);
 343         }
 344
 345         cid_tmp = kmalloc(16, GFP_KERNEL);
 346         if (!cid_tmp)
 347                 return -ENOMEM;
 348
 349         ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
 350         if (ret)
 351                 goto err;
 352
 353         for (i = 0;i < 4;i++)
 354                 cid[i] = be32_to_cpu(cid_tmp[i]);
 355
 356 err:
 357         kfree(cid_tmp);
 358         return ret;
 359 }
 360
 361 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 362 {
 363         return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
 364                         ext_csd, 512);
 365 }
 366
 367 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
 368 {
 369         struct mmc_command cmd = {0};
 370         int err;
 371
 372         cmd.opcode = MMC_SPI_READ_OCR;
 373         cmd.arg = highcap ? (1 << 30) : 0;
 374         cmd.flags = MMC_RSP_SPI_R3;
 375
 376         err = mmc_wait_for_cmd(host, &cmd, 0);
 377
 378         *ocrp = cmd.resp[1];
 379         return err;
 380 }
 381
 382 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
 383 {
 384         struct mmc_command cmd = {0};
 385         int err;
 386
 387         cmd.opcode = MMC_SPI_CRC_ON_OFF;
 388         cmd.flags = MMC_RSP_SPI_R1;
 389         cmd.arg = use_crc;
 390
 391         err = mmc_wait_for_cmd(host, &cmd, 0);
 392         if (!err)
 393                 host->use_spi_crc = use_crc;
 394         return err;
 395 }
 396
 397 /**
 398  *      __mmc_switch - modify EXT_CSD register
 399  *      @card: the MMC card associated with the data transfer
 400  *      @set: cmd set values
 401  *      @index: EXT_CSD register index
 402  *      @value: value to program into EXT_CSD register
 403  *      @timeout_ms: timeout (ms) for operation performed by register write,
 404  *                   timeout of zero implies maximum possible timeout
 405  *      @use_busy_signal: use the busy signal as response type
 406  *
 407  *      Modifies the EXT_CSD register for selected card.
 408  */
 409 int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 410                unsigned int timeout_ms, bool use_busy_signal)
 411 {
 412         int err;
 413         struct mmc_command cmd = {0};
 414         unsigned long timeout;
 415         u32 status;
 416
 417         BUG_ON(!card);
 418         BUG_ON(!card->host);
 419
 420         cmd.opcode = MMC_SWITCH;
 421         cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 422                   (index << 16) |
 423                   (value << 8) |
 424                   set;
 425         cmd.flags = MMC_CMD_AC;
 426         if (use_busy_signal)
 427                 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
 428         else
 429                 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
 430
 431
 432         cmd.cmd_timeout_ms = timeout_ms;
 433
 434         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 435         if (err)
 436                 return err;
 437
 438         /* No need to check card status in case of unblocking command */
 439         if (!use_busy_signal)
 440                 return 0;
 441
 442         /* Must check status to be sure of no errors */
 443         timeout = jiffies + msecs_to_jiffies(MMC_OPS_TIMEOUT_MS);
 444         do {
 445                 err = mmc_send_status(card, &status);
 446                 if (err)
 447                         return err;
 448                 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
 449                         break;
 450                 if (mmc_host_is_spi(card->host))
 451                         break;
 452
 453                 /* Timeout if the device never leaves the program state. */
 454                 if (time_after(jiffies, timeout)) {
 455                         pr_err("%s: Card stuck in programming state! %s\n",
 456                                 mmc_hostname(card->host), __func__);
 457                         return -ETIMEDOUT;
 458                 }
 459         } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
 460
 461         if (mmc_host_is_spi(card->host)) {
 462                 if (status & R1_SPI_ILLEGAL_COMMAND)
 463                         return -EBADMSG;
 464         } else {
 465                 if (status & 0xFDFFA000)
 466                         pr_warning("%s: unexpected status %#x after "
 467                                "switch", mmc_hostname(card->host), status);
 468                 if (status & R1_SWITCH_ERROR)
 469                         return -EBADMSG;
 470         }
 471
 472         return 0;
 473 }
 474 EXPORT_SYMBOL_GPL(__mmc_switch);
 475
 476 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 477                 unsigned int timeout_ms)
 478 {
 479         return __mmc_switch(card, set, index, value, timeout_ms, true);
 480 }
 481 EXPORT_SYMBOL_GPL(mmc_switch);
 482
 483 int mmc_send_status(struct mmc_card *card, u32 *status)
 484 {
 485         int err;
 486         struct mmc_command cmd = {0};
 487
 488         BUG_ON(!card);
 489         BUG_ON(!card->host);
 490
 491         cmd.opcode = MMC_SEND_STATUS;
 492         if (!mmc_host_is_spi(card->host))
 493                 cmd.arg = card->rca << 16;
 494         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 495
 496         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 497         if (err)
 498                 return err;
 499
 500         /* NOTE: callers are required to understand the difference
 501          * between "native" and SPI format status words!
 502          */
 503         if (status)
 504                 *status = cmd.resp[0];
 505
 506         return 0;
 507 }
 508
 509 static int
 510 mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
 511                   u8 len)
 512 {
 513         struct mmc_request mrq = {NULL};
 514         struct mmc_command cmd = {0};
 515         struct mmc_data data = {0};
 516         struct scatterlist sg;
 517         u8 *data_buf;
 518         u8 *test_buf;
 519         int i, err;
 520         static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
 521         static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
 522
 523         /* dma onto stack is unsafe/nonportable, but callers to this
 524          * routine normally provide temporary on-stack buffers ...
 525          */
 526         data_buf = kmalloc(len, GFP_KERNEL);
 527         if (!data_buf)
 528                 return -ENOMEM;
 529
 530         if (len == 8)
 531                 test_buf = testdata_8bit;
 532         else if (len == 4)
 533                 test_buf = testdata_4bit;
 534         else {
 535                 pr_err("%s: Invalid bus_width %d\n",
 536                        mmc_hostname(host), len);
 537                 kfree(data_buf);
 538                 return -EINVAL;
 539         }
 540
 541         if (opcode == MMC_BUS_TEST_W)
 542                 memcpy(data_buf, test_buf, len);
 543
 544         mrq.cmd = &cmd;
 545         mrq.data = &data;
 546         cmd.opcode = opcode;
 547         cmd.arg = 0;
 548
 549         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 550          * rely on callers to never use this with "native" calls for reading
 551          * CSD or CID.  Native versions of those commands use the R2 type,
 552          * not R1 plus a data block.
 553          */
 554         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 555
 556         data.blksz = len;
 557         data.blocks = 1;
 558         if (opcode == MMC_BUS_TEST_R)
 559                 data.flags = MMC_DATA_READ;
 560         else
 561                 data.flags = MMC_DATA_WRITE;
 562
 563         data.sg = &sg;
 564         data.sg_len = 1;
 565         sg_init_one(&sg, data_buf, len);
 566         mmc_wait_for_req(host, &mrq);
 567         err = 0;
 568         if (opcode == MMC_BUS_TEST_R) {
 569                 for (i = 0; i < len / 4; i++)
 570                         if ((test_buf[i] ^ data_buf[i]) != 0xff) {
 571                                 err = -EIO;
 572                                 break;
 573                         }
 574         }
 575         kfree(data_buf);
 576
 577         if (cmd.error)
 578                 return cmd.error;
 579         if (data.error)
 580                 return data.error;
 581
 582         return err;
 583 }
 584
 585 int mmc_bus_test(struct mmc_card *card, u8 bus_width)
 586 {
 587         int err, width;
 588
 589         if (bus_width == MMC_BUS_WIDTH_8)
 590                 width = 8;
 591         else if (bus_width == MMC_BUS_WIDTH_4)
 592                 width = 4;
 593         else if (bus_width == MMC_BUS_WIDTH_1)
 594                 return 0; /* no need for test */
 595         else
 596                 return -EINVAL;
 597
 598         /*
 599          * Ignore errors from BUS_TEST_W.  BUS_TEST_R will fail if there
 600          * is a problem.  This improves chances that the test will work.
 601          */
 602         mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
 603         err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
 604         return err;
 605 }
 606
 607 int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
 608 {
 609         struct mmc_command cmd = {0};
 610         unsigned int opcode;
 611         int err;
 612
 613         if (!card->ext_csd.hpi) {
 614                 pr_warning("%s: Card didn't support HPI command\n",
 615                            mmc_hostname(card->host));
 616                 return -EINVAL;
 617         }
 618
 619         opcode = card->ext_csd.hpi_cmd;
 620         if (opcode == MMC_STOP_TRANSMISSION)
 621                 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
 622         else if (opcode == MMC_SEND_STATUS)
 623                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 624
 625         cmd.opcode = opcode;
 626         cmd.arg = card->rca << 16 | 1;
 627
 628         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 629         if (err) {
 630                 pr_warn("%s: error %d interrupting operation. "
 631                         "HPI command response %#x\n", mmc_hostname(card->host),
 632                         err, cmd.resp[0]);
 633                 return err;
 634         }
 635         if (status)
 636                 *status = cmd.resp[0];
 637
 638         return 0;
 639 }