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/types.h>
  14 #include <linux/scatterlist.h>
  15
  16 #include <linux/mmc/host.h>
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/mmc.h>
  19
  20 #include "core.h"
  21 #include "mmc_ops.h"
  22
  23 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
  24 {
  25         int err;
  26         struct mmc_command cmd = {0};
  27
  28         BUG_ON(!host);
  29
  30         cmd.opcode = MMC_SELECT_CARD;
  31
  32         if (card) {
  33                 cmd.arg = card->rca << 16;
  34                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
  35         } else {
  36                 cmd.arg = 0;
  37                 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
  38         }
  39
  40         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  41         if (err)
  42                 return err;
  43
  44         return 0;
  45 }
  46
  47 int mmc_select_card(struct mmc_card *card)
  48 {
  49         BUG_ON(!card);
  50
  51         return _mmc_select_card(card->host, card);
  52 }
  53
  54 int mmc_deselect_cards(struct mmc_host *host)
  55 {
  56         return _mmc_select_card(host, NULL);
  57 }
  58
  59 int mmc_card_sleepawake(struct mmc_host *host, int sleep)
  60 {
  61         struct mmc_command cmd = {0};
  62         struct mmc_card *card = host->card;
  63         int err;
  64
  65         if (sleep)
  66                 mmc_deselect_cards(host);
  67
  68         cmd.opcode = MMC_SLEEP_AWAKE;
  69         cmd.arg = card->rca << 16;
  70         if (sleep)
  71                 cmd.arg |= 1 << 15;
  72
  73         cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
  74         err = mmc_wait_for_cmd(host, &cmd, 0);
  75         if (err)
  76                 return err;
  77
  78         /*
  79          * If the host does not wait while the card signals busy, then we will
  80          * will have to wait the sleep/awake timeout.  Note, we cannot use the
  81          * SEND_STATUS command to poll the status because that command (and most
  82          * others) is invalid while the card sleeps.
  83          */
  84         if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
  85                 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
  86
  87         if (!sleep)
  88                 err = mmc_select_card(card);
  89
  90         return err;
  91 }
  92
  93 int mmc_go_idle(struct mmc_host *host)
  94 {
  95         int err;
  96         struct mmc_command cmd = {0};
  97
  98         /*
  99          * Non-SPI hosts need to prevent chipselect going active during
 100          * GO_IDLE; that would put chips into SPI mode.  Remind them of
 101          * that in case of hardware that won't pull up DAT3/nCS otherwise.
 102          *
 103          * SPI hosts ignore ios.chip_select; it's managed according to
 104          * rules that must accommodate non-MMC slaves which this layer
 105          * won't even know about.
 106          */
 107         if (!mmc_host_is_spi(host)) {
 108                 mmc_set_chip_select(host, MMC_CS_HIGH);
 109                 mmc_delay(1);
 110         }
 111
 112         cmd.opcode = MMC_GO_IDLE_STATE;
 113         cmd.arg = 0;
 114         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
 115
 116         err = mmc_wait_for_cmd(host, &cmd, 0);
 117
 118         mmc_delay(1);
 119
 120         if (!mmc_host_is_spi(host)) {
 121                 mmc_set_chip_select(host, MMC_CS_DONTCARE);
 122                 mmc_delay(1);
 123         }
 124
 125         host->use_spi_crc = 0;
 126
 127         return err;
 128 }
 129
 130 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 131 {
 132         struct mmc_command cmd = {0};
 133         int i, err = 0;
 134
 135         BUG_ON(!host);
 136
 137         cmd.opcode = MMC_SEND_OP_COND;
 138         cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
 139         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 140
 141         for (i = 100; i; i--) {
 142                 err = mmc_wait_for_cmd(host, &cmd, 0);
 143                 if (err)
 144                         break;
 145
 146                 /* if we're just probing, do a single pass */
 147                 if (ocr == 0)
 148                         break;
 149
 150                 /* otherwise wait until reset completes */
 151                 if (mmc_host_is_spi(host)) {
 152                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 153                                 break;
 154                 } else {
 155                         if (cmd.resp[0] & MMC_CARD_BUSY)
 156                                 break;
 157                 }
 158
 159                 err = -ETIMEDOUT;
 160
 161                 mmc_delay(10);
 162         }
 163
 164         if (rocr && !mmc_host_is_spi(host))
 165                 *rocr = cmd.resp[0];
 166
 167         return err;
 168 }
 169
 170 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
 171 {
 172         int err;
 173         struct mmc_command cmd = {0};
 174
 175         BUG_ON(!host);
 176         BUG_ON(!cid);
 177
 178         cmd.opcode = MMC_ALL_SEND_CID;
 179         cmd.arg = 0;
 180         cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
 181
 182         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 183         if (err)
 184                 return err;
 185
 186         memcpy(cid, cmd.resp, sizeof(u32) * 4);
 187
 188         return 0;
 189 }
 190
 191 int mmc_set_relative_addr(struct mmc_card *card)
 192 {
 193         int err;
 194         struct mmc_command cmd = {0};
 195
 196         BUG_ON(!card);
 197         BUG_ON(!card->host);
 198
 199         cmd.opcode = MMC_SET_RELATIVE_ADDR;
 200         cmd.arg = card->rca << 16;
 201         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 202
 203         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 204         if (err)
 205                 return err;
 206
 207         return 0;
 208 }
 209
 210 static int
 211 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
 212 {
 213         int err;
 214         struct mmc_command cmd = {0};
 215
 216         BUG_ON(!host);
 217         BUG_ON(!cxd);
 218
 219         cmd.opcode = opcode;
 220         cmd.arg = arg;
 221         cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
 222
 223         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 224         if (err)
 225                 return err;
 226
 227         memcpy(cxd, cmd.resp, sizeof(u32) * 4);
 228
 229         return 0;
 230 }
 231
 232 static int
 233 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 234                 u32 opcode, void *buf, unsigned len)
 235 {
 236         struct mmc_request mrq = {0};
 237         struct mmc_command cmd = {0};
 238         struct mmc_data data = {0};
 239         struct scatterlist sg;
 240         void *data_buf;
 241
 242         /* dma onto stack is unsafe/nonportable, but callers to this
 243          * routine normally provide temporary on-stack buffers ...
 244          */
 245         data_buf = kmalloc(len, GFP_KERNEL);
 246         if (data_buf == NULL)
 247                 return -ENOMEM;
 248
 249         mrq.cmd = &cmd;
 250         mrq.data = &data;
 251
 252         cmd.opcode = opcode;
 253         cmd.arg = 0;
 254
 255         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 256          * rely on callers to never use this with "native" calls for reading
 257          * CSD or CID.  Native versions of those commands use the R2 type,
 258          * not R1 plus a data block.
 259          */
 260         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 261
 262         data.blksz = len;
 263         data.blocks = 1;
 264         data.flags = MMC_DATA_READ;
 265         data.sg = &sg;
 266         data.sg_len = 1;
 267
 268         sg_init_one(&sg, data_buf, len);
 269
 270         if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
 271                 /*
 272                  * The spec states that CSR and CID accesses have a timeout
 273                  * of 64 clock cycles.
 274                  */
 275                 data.timeout_ns = 0;
 276                 data.timeout_clks = 64;
 277         } else
 278                 mmc_set_data_timeout(&data, card);
 279
 280         mmc_wait_for_req(host, &mrq);
 281
 282         memcpy(buf, data_buf, len);
 283         kfree(data_buf);
 284
 285         if (cmd.error)
 286                 return cmd.error;
 287         if (data.error)
 288                 return data.error;
 289
 290         return 0;
 291 }
 292
 293 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 294 {
 295         int ret, i;
 296
 297         if (!mmc_host_is_spi(card->host))
 298                 return mmc_send_cxd_native(card->host, card->rca << 16,
 299                                 csd, MMC_SEND_CSD);
 300
 301         ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
 302         if (ret)
 303                 return ret;
 304
 305         for (i = 0;i < 4;i++)
 306                 csd[i] = be32_to_cpu(csd[i]);
 307
 308         return 0;
 309 }
 310
 311 int mmc_send_cid(struct mmc_host *host, u32 *cid)
 312 {
 313         int ret, i;
 314
 315         if (!mmc_host_is_spi(host)) {
 316                 if (!host->card)
 317                         return -EINVAL;
 318                 return mmc_send_cxd_native(host, host->card->rca << 16,
 319                                 cid, MMC_SEND_CID);
 320         }
 321
 322         ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
 323         if (ret)
 324                 return ret;
 325
 326         for (i = 0;i < 4;i++)
 327                 cid[i] = be32_to_cpu(cid[i]);
 328
 329         return 0;
 330 }
 331
 332 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 333 {
 334         return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
 335                         ext_csd, 512);
 336 }
 337
 338 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
 339 {
 340         struct mmc_command cmd = {0};
 341         int err;
 342
 343         cmd.opcode = MMC_SPI_READ_OCR;
 344         cmd.arg = highcap ? (1 << 30) : 0;
 345         cmd.flags = MMC_RSP_SPI_R3;
 346
 347         err = mmc_wait_for_cmd(host, &cmd, 0);
 348
 349         *ocrp = cmd.resp[1];
 350         return err;
 351 }
 352
 353 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
 354 {
 355         struct mmc_command cmd = {0};
 356         int err;
 357
 358         cmd.opcode = MMC_SPI_CRC_ON_OFF;
 359         cmd.flags = MMC_RSP_SPI_R1;
 360         cmd.arg = use_crc;
 361
 362         err = mmc_wait_for_cmd(host, &cmd, 0);
 363         if (!err)
 364                 host->use_spi_crc = use_crc;
 365         return err;
 366 }
 367
 368 /**
 369  *      mmc_switch - modify EXT_CSD register
 370  *      @card: the MMC card associated with the data transfer
 371  *      @set: cmd set values
 372  *      @index: EXT_CSD register index
 373  *      @value: value to program into EXT_CSD register
 374  *      @timeout_ms: timeout (ms) for operation performed by register write,
 375  *                   timeout of zero implies maximum possible timeout
 376  *
 377  *      Modifies the EXT_CSD register for selected card.
 378  */
 379 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 380                unsigned int timeout_ms)
 381 {
 382         int err;
 383         struct mmc_command cmd = {0};
 384         u32 status;
 385
 386         BUG_ON(!card);
 387         BUG_ON(!card->host);
 388
 389         cmd.opcode = MMC_SWITCH;
 390         cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 391                   (index << 16) |
 392                   (value << 8) |
 393                   set;
 394         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 395         cmd.cmd_timeout_ms = timeout_ms;
 396
 397         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 398         if (err)
 399                 return err;
 400
 401         /* Must check status to be sure of no errors */
 402         do {
 403                 err = mmc_send_status(card, &status);
 404                 if (err)
 405                         return err;
 406                 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
 407                         break;
 408                 if (mmc_host_is_spi(card->host))
 409                         break;
 410         } while (R1_CURRENT_STATE(status) == 7);
 411
 412         if (mmc_host_is_spi(card->host)) {
 413                 if (status & R1_SPI_ILLEGAL_COMMAND)
 414                         return -EBADMSG;
 415         } else {
 416                 if (status & 0xFDFFA000)
 417                         printk(KERN_WARNING "%s: unexpected status %#x after "
 418                                "switch", mmc_hostname(card->host), status);
 419                 if (status & R1_SWITCH_ERROR)
 420                         return -EBADMSG;
 421         }
 422
 423         return 0;
 424 }
 425 EXPORT_SYMBOL_GPL(mmc_switch);
 426
 427 int mmc_send_status(struct mmc_card *card, u32 *status)
 428 {
 429         int err;
 430         struct mmc_command cmd = {0};
 431
 432         BUG_ON(!card);
 433         BUG_ON(!card->host);
 434
 435         cmd.opcode = MMC_SEND_STATUS;
 436         if (!mmc_host_is_spi(card->host))
 437                 cmd.arg = card->rca << 16;
 438         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 439
 440         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 441         if (err)
 442                 return err;
 443
 444         /* NOTE: callers are required to understand the difference
 445          * between "native" and SPI format status words!
 446          */
 447         if (status)
 448                 *status = cmd.resp[0];
 449
 450         return 0;
 451 }
 452
 453 static int
 454 mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
 455                   u8 len)
 456 {
 457         struct mmc_request mrq = {0};
 458         struct mmc_command cmd = {0};
 459         struct mmc_data data = {0};
 460         struct scatterlist sg;
 461         u8 *data_buf;
 462         u8 *test_buf;
 463         int i, err;
 464         static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
 465         static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
 466
 467         /* dma onto stack is unsafe/nonportable, but callers to this
 468          * routine normally provide temporary on-stack buffers ...
 469          */
 470         data_buf = kmalloc(len, GFP_KERNEL);
 471         if (!data_buf)
 472                 return -ENOMEM;
 473
 474         if (len == 8)
 475                 test_buf = testdata_8bit;
 476         else if (len == 4)
 477                 test_buf = testdata_4bit;
 478         else {
 479                 printk(KERN_ERR "%s: Invalid bus_width %d\n",
 480                        mmc_hostname(host), len);
 481                 kfree(data_buf);
 482                 return -EINVAL;
 483         }
 484
 485         if (opcode == MMC_BUS_TEST_W)
 486                 memcpy(data_buf, test_buf, len);
 487
 488         mrq.cmd = &cmd;
 489         mrq.data = &data;
 490         cmd.opcode = opcode;
 491         cmd.arg = 0;
 492
 493         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 494          * rely on callers to never use this with "native" calls for reading
 495          * CSD or CID.  Native versions of those commands use the R2 type,
 496          * not R1 plus a data block.
 497          */
 498         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 499
 500         data.blksz = len;
 501         data.blocks = 1;
 502         if (opcode == MMC_BUS_TEST_R)
 503                 data.flags = MMC_DATA_READ;
 504         else
 505                 data.flags = MMC_DATA_WRITE;
 506
 507         data.sg = &sg;
 508         data.sg_len = 1;
 509         sg_init_one(&sg, data_buf, len);
 510         mmc_wait_for_req(host, &mrq);
 511         err = 0;
 512         if (opcode == MMC_BUS_TEST_R) {
 513                 for (i = 0; i < len / 4; i++)
 514                         if ((test_buf[i] ^ data_buf[i]) != 0xff) {
 515                                 err = -EIO;
 516                                 break;
 517                         }
 518         }
 519         kfree(data_buf);
 520
 521         if (cmd.error)
 522                 return cmd.error;
 523         if (data.error)
 524                 return data.error;
 525
 526         return err;
 527 }
 528
 529 int mmc_bus_test(struct mmc_card *card, u8 bus_width)
 530 {
 531         int err, width;
 532
 533         if (bus_width == MMC_BUS_WIDTH_8)
 534                 width = 8;
 535         else if (bus_width == MMC_BUS_WIDTH_4)
 536                 width = 4;
 537         else if (bus_width == MMC_BUS_WIDTH_1)
 538                 return 0; /* no need for test */
 539         else
 540                 return -EINVAL;
 541
 542         /*
 543          * Ignore errors from BUS_TEST_W.  BUS_TEST_R will fail if there
 544          * is a problem.  This improves chances that the test will work.
 545          */
 546         mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
 547         err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
 548         return err;
 549 }