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/types.h>
  13 #include <linux/scatterlist.h>
  14
  15 #include <linux/mmc/host.h>
  16 #include <linux/mmc/card.h>
  17 #include <linux/mmc/mmc.h>
  18
  19 #include "core.h"
  20 #include "mmc_ops.h"
  21
  22 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
  23 {
  24         int err;
  25         struct mmc_command cmd;
  26
  27         BUG_ON(!host);
  28
  29         memset(&cmd, 0, sizeof(struct mmc_command));
  30
  31         cmd.opcode = MMC_SELECT_CARD;
  32
  33         if (card) {
  34                 cmd.arg = card->rca << 16;
  35                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
  36         } else {
  37                 cmd.arg = 0;
  38                 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
  39         }
  40
  41         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  42         if (err)
  43                 return err;
  44
  45         return 0;
  46 }
  47
  48 int mmc_select_card(struct mmc_card *card)
  49 {
  50         BUG_ON(!card);
  51
  52         return _mmc_select_card(card->host, card);
  53 }
  54
  55 int mmc_deselect_cards(struct mmc_host *host)
  56 {
  57         return _mmc_select_card(host, NULL);
  58 }
  59
  60 int mmc_card_sleepawake(struct mmc_host *host, int sleep)
  61 {
  62         struct mmc_command cmd;
  63         struct mmc_card *card = host->card;
  64         int err;
  65
  66         if (sleep)
  67                 mmc_deselect_cards(host);
  68
  69         memset(&cmd, 0, sizeof(struct mmc_command));
  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;
 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 accomodate 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         memset(&cmd, 0, sizeof(struct mmc_command));
 116
 117         cmd.opcode = MMC_GO_IDLE_STATE;
 118         cmd.arg = 0;
 119         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
 120
 121         err = mmc_wait_for_cmd(host, &cmd, 0);
 122
 123         mmc_delay(1);
 124
 125         if (!mmc_host_is_spi(host)) {
 126                 mmc_set_chip_select(host, MMC_CS_DONTCARE);
 127                 mmc_delay(1);
 128         }
 129
 130         host->use_spi_crc = 0;
 131
 132         return err;
 133 }
 134
 135 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 136 {
 137         struct mmc_command cmd;
 138         int i, err = 0;
 139
 140         BUG_ON(!host);
 141
 142         memset(&cmd, 0, sizeof(struct mmc_command));
 143
 144         cmd.opcode = MMC_SEND_OP_COND;
 145         cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
 146         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 147
 148         for (i = 100; i; i--) {
 149                 err = mmc_wait_for_cmd(host, &cmd, 0);
 150                 if (err)
 151                         break;
 152
 153                 /* if we're just probing, do a single pass */
 154                 if (ocr == 0)
 155                         break;
 156
 157                 /* otherwise wait until reset completes */
 158                 if (mmc_host_is_spi(host)) {
 159                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 160                                 break;
 161                 } else {
 162                         if (cmd.resp[0] & MMC_CARD_BUSY)
 163                                 break;
 164                 }
 165
 166                 err = -ETIMEDOUT;
 167
 168                 mmc_delay(10);
 169         }
 170
 171         if (rocr && !mmc_host_is_spi(host))
 172                 *rocr = cmd.resp[0];
 173
 174         return err;
 175 }
 176
 177 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
 178 {
 179         int err;
 180         struct mmc_command cmd;
 181
 182         BUG_ON(!host);
 183         BUG_ON(!cid);
 184
 185         memset(&cmd, 0, sizeof(struct mmc_command));
 186
 187         cmd.opcode = MMC_ALL_SEND_CID;
 188         cmd.arg = 0;
 189         cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
 190
 191         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 192         if (err)
 193                 return err;
 194
 195         memcpy(cid, cmd.resp, sizeof(u32) * 4);
 196
 197         return 0;
 198 }
 199
 200 int mmc_set_relative_addr(struct mmc_card *card)
 201 {
 202         int err;
 203         struct mmc_command cmd;
 204
 205         BUG_ON(!card);
 206         BUG_ON(!card->host);
 207
 208         memset(&cmd, 0, sizeof(struct mmc_command));
 209
 210         cmd.opcode = MMC_SET_RELATIVE_ADDR;
 211         cmd.arg = card->rca << 16;
 212         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 213
 214         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 215         if (err)
 216                 return err;
 217
 218         return 0;
 219 }
 220
 221 static int
 222 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
 223 {
 224         int err;
 225         struct mmc_command cmd;
 226
 227         BUG_ON(!host);
 228         BUG_ON(!cxd);
 229
 230         memset(&cmd, 0, sizeof(struct mmc_command));
 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 static int
 246 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 247                 u32 opcode, void *buf, unsigned len)
 248 {
 249         struct mmc_request mrq;
 250         struct mmc_command cmd;
 251         struct mmc_data data;
 252         struct scatterlist sg;
 253         void *data_buf;
 254
 255         /* dma onto stack is unsafe/nonportable, but callers to this
 256          * routine normally provide temporary on-stack buffers ...
 257          */
 258         data_buf = kmalloc(len, GFP_KERNEL);
 259         if (data_buf == NULL)
 260                 return -ENOMEM;
 261
 262         memset(&mrq, 0, sizeof(struct mmc_request));
 263         memset(&cmd, 0, sizeof(struct mmc_command));
 264         memset(&data, 0, sizeof(struct mmc_data));
 265
 266         mrq.cmd = &cmd;
 267         mrq.data = &data;
 268
 269         cmd.opcode = opcode;
 270         cmd.arg = 0;
 271
 272         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 273          * rely on callers to never use this with "native" calls for reading
 274          * CSD or CID.  Native versions of those commands use the R2 type,
 275          * not R1 plus a data block.
 276          */
 277         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 278
 279         data.blksz = len;
 280         data.blocks = 1;
 281         data.flags = MMC_DATA_READ;
 282         data.sg = &sg;
 283         data.sg_len = 1;
 284
 285         sg_init_one(&sg, data_buf, len);
 286
 287         if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
 288                 /*
 289                  * The spec states that CSR and CID accesses have a timeout
 290                  * of 64 clock cycles.
 291                  */
 292                 data.timeout_ns = 0;
 293                 data.timeout_clks = 64;
 294         } else
 295                 mmc_set_data_timeout(&data, card);
 296
 297         mmc_wait_for_req(host, &mrq);
 298
 299         memcpy(buf, data_buf, len);
 300         kfree(data_buf);
 301
 302         if (cmd.error)
 303                 return cmd.error;
 304         if (data.error)
 305                 return data.error;
 306
 307         return 0;
 308 }
 309
 310 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 311 {
 312         int ret, i;
 313
 314         if (!mmc_host_is_spi(card->host))
 315                 return mmc_send_cxd_native(card->host, card->rca << 16,
 316                                 csd, MMC_SEND_CSD);
 317
 318         ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
 319         if (ret)
 320                 return ret;
 321
 322         for (i = 0;i < 4;i++)
 323                 csd[i] = be32_to_cpu(csd[i]);
 324
 325         return 0;
 326 }
 327
 328 int mmc_send_cid(struct mmc_host *host, u32 *cid)
 329 {
 330         int ret, i;
 331
 332         if (!mmc_host_is_spi(host)) {
 333                 if (!host->card)
 334                         return -EINVAL;
 335                 return mmc_send_cxd_native(host, host->card->rca << 16,
 336                                 cid, MMC_SEND_CID);
 337         }
 338
 339         ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
 340         if (ret)
 341                 return ret;
 342
 343         for (i = 0;i < 4;i++)
 344                 cid[i] = be32_to_cpu(cid[i]);
 345
 346         return 0;
 347 }
 348
 349 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 350 {
 351         return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
 352                         ext_csd, 512);
 353 }
 354
 355 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
 356 {
 357         struct mmc_command cmd;
 358         int err;
 359
 360         memset(&cmd, 0, sizeof(struct mmc_command));
 361
 362         cmd.opcode = MMC_SPI_READ_OCR;
 363         cmd.arg = highcap ? (1 << 30) : 0;
 364         cmd.flags = MMC_RSP_SPI_R3;
 365
 366         err = mmc_wait_for_cmd(host, &cmd, 0);
 367
 368         *ocrp = cmd.resp[1];
 369         return err;
 370 }
 371
 372 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
 373 {
 374         struct mmc_command cmd;
 375         int err;
 376
 377         memset(&cmd, 0, sizeof(struct mmc_command));
 378
 379         cmd.opcode = MMC_SPI_CRC_ON_OFF;
 380         cmd.flags = MMC_RSP_SPI_R1;
 381         cmd.arg = use_crc;
 382
 383         err = mmc_wait_for_cmd(host, &cmd, 0);
 384         if (!err)
 385                 host->use_spi_crc = use_crc;
 386         return err;
 387 }
 388
 389 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
 390 {
 391         int err;
 392         struct mmc_command cmd;
 393         u32 status;
 394
 395         BUG_ON(!card);
 396         BUG_ON(!card->host);
 397
 398         memset(&cmd, 0, sizeof(struct mmc_command));
 399
 400         cmd.opcode = MMC_SWITCH;
 401         cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 402                   (index << 16) |
 403                   (value << 8) |
 404                   set;
 405         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 406
 407         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 408         if (err)
 409                 return err;
 410
 411         /* Must check status to be sure of no errors */
 412         do {
 413                 err = mmc_send_status(card, &status);
 414                 if (err)
 415                         return err;
 416                 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
 417                         break;
 418                 if (mmc_host_is_spi(card->host))
 419                         break;
 420         } while (R1_CURRENT_STATE(status) == 7);
 421
 422         if (mmc_host_is_spi(card->host)) {
 423                 if (status & R1_SPI_ILLEGAL_COMMAND)
 424                         return -EBADMSG;
 425         } else {
 426                 if (status & 0xFDFFA000)
 427                         printk(KERN_WARNING "%s: unexpected status %#x after "
 428                                "switch", mmc_hostname(card->host), status);
 429                 if (status & R1_SWITCH_ERROR)
 430                         return -EBADMSG;
 431         }
 432
 433         return 0;
 434 }
 435
 436 int mmc_send_status(struct mmc_card *card, u32 *status)
 437 {
 438         int err;
 439         struct mmc_command cmd;
 440
 441         BUG_ON(!card);
 442         BUG_ON(!card->host);
 443
 444         memset(&cmd, 0, sizeof(struct mmc_command));
 445
 446         cmd.opcode = MMC_SEND_STATUS;
 447         if (!mmc_host_is_spi(card->host))
 448                 cmd.arg = card->rca << 16;
 449         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 450
 451         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 452         if (err)
 453                 return err;
 454
 455         /* NOTE: callers are required to understand the difference
 456          * between "native" and SPI format status words!
 457          */
 458         if (status)
 459                 *status = cmd.resp[0];
 460
 461         return 0;
 462 }
 463