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