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