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_go_idle(struct mmc_host *host)
  61 {
  62         int err;
  63         struct mmc_command cmd;
  64
  65         /*
  66          * Non-SPI hosts need to prevent chipselect going active during
  67          * GO_IDLE; that would put chips into SPI mode.  Remind them of
  68          * that in case of hardware that won't pull up DAT3/nCS otherwise.
  69          *
  70          * SPI hosts ignore ios.chip_select; it's managed according to
  71          * rules that must accomodate non-MMC slaves which this layer
  72          * won't even know about.
  73          */
  74         if (!mmc_host_is_spi(host)) {
  75                 mmc_set_chip_select(host, MMC_CS_HIGH);
  76                 mmc_delay(1);
  77         }
  78
  79         memset(&cmd, 0, sizeof(struct mmc_command));
  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;
 102         int i, err = 0;
 103
 104         BUG_ON(!host);
 105
 106         memset(&cmd, 0, sizeof(struct mmc_command));
 107
 108         cmd.opcode = MMC_SEND_OP_COND;
 109         cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
 110         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 111
 112         for (i = 100; i; i--) {
 113                 err = mmc_wait_for_cmd(host, &cmd, 0);
 114                 if (err)
 115                         break;
 116
 117                 /* if we're just probing, do a single pass */
 118                 if (ocr == 0)
 119                         break;
 120
 121                 /* otherwise wait until reset completes */
 122                 if (mmc_host_is_spi(host)) {
 123                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 124                                 break;
 125                 } else {
 126                         if (cmd.resp[0] & MMC_CARD_BUSY)
 127                                 break;
 128                 }
 129
 130                 err = -ETIMEDOUT;
 131
 132                 mmc_delay(10);
 133         }
 134
 135         if (rocr && !mmc_host_is_spi(host))
 136                 *rocr = cmd.resp[0];
 137
 138         return err;
 139 }
 140
 141 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
 142 {
 143         int err;
 144         struct mmc_command cmd;
 145
 146         BUG_ON(!host);
 147         BUG_ON(!cid);
 148
 149         memset(&cmd, 0, sizeof(struct mmc_command));
 150
 151         cmd.opcode = MMC_ALL_SEND_CID;
 152         cmd.arg = 0;
 153         cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
 154
 155         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 156         if (err)
 157                 return err;
 158
 159         memcpy(cid, cmd.resp, sizeof(u32) * 4);
 160
 161         return 0;
 162 }
 163
 164 int mmc_set_relative_addr(struct mmc_card *card)
 165 {
 166         int err;
 167         struct mmc_command cmd;
 168
 169         BUG_ON(!card);
 170         BUG_ON(!card->host);
 171
 172         memset(&cmd, 0, sizeof(struct mmc_command));
 173
 174         cmd.opcode = MMC_SET_RELATIVE_ADDR;
 175         cmd.arg = card->rca << 16;
 176         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 177
 178         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 179         if (err)
 180                 return err;
 181
 182         return 0;
 183 }
 184
 185 static int
 186 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
 187 {
 188         int err;
 189         struct mmc_command cmd;
 190
 191         BUG_ON(!host);
 192         BUG_ON(!cxd);
 193
 194         memset(&cmd, 0, sizeof(struct mmc_command));
 195
 196         cmd.opcode = opcode;
 197         cmd.arg = arg;
 198         cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
 199
 200         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 201         if (err)
 202                 return err;
 203
 204         memcpy(cxd, cmd.resp, sizeof(u32) * 4);
 205
 206         return 0;
 207 }
 208
 209 static int
 210 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 211                 u32 opcode, void *buf, unsigned len)
 212 {
 213         struct mmc_request mrq;
 214         struct mmc_command cmd;
 215         struct mmc_data data;
 216         struct scatterlist sg;
 217         void *data_buf;
 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 == NULL)
 224                 return -ENOMEM;
 225
 226         memset(&mrq, 0, sizeof(struct mmc_request));
 227         memset(&cmd, 0, sizeof(struct mmc_command));
 228         memset(&data, 0, sizeof(struct mmc_data));
 229
 230         mrq.cmd = &cmd;
 231         mrq.data = &data;
 232
 233         cmd.opcode = opcode;
 234         cmd.arg = 0;
 235
 236         /* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 237          * rely on callers to never use this with "native" calls for reading
 238          * CSD or CID.  Native versions of those commands use the R2 type,
 239          * not R1 plus a data block.
 240          */
 241         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 242
 243         data.blksz = len;
 244         data.blocks = 1;
 245         data.flags = MMC_DATA_READ;
 246         data.sg = &sg;
 247         data.sg_len = 1;
 248
 249         sg_init_one(&sg, data_buf, len);
 250
 251         /*
 252          * The spec states that CSR and CID accesses have a timeout
 253          * of 64 clock cycles.
 254          */
 255         data.timeout_ns = 0;
 256         data.timeout_clks = 64;
 257
 258         mmc_wait_for_req(host, &mrq);
 259
 260         memcpy(buf, data_buf, len);
 261         kfree(data_buf);
 262
 263         if (cmd.error)
 264                 return cmd.error;
 265         if (data.error)
 266                 return data.error;
 267
 268         return 0;
 269 }
 270
 271 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 272 {
 273         int ret, i;
 274
 275         if (!mmc_host_is_spi(card->host))
 276                 return mmc_send_cxd_native(card->host, card->rca << 16,
 277                                 csd, MMC_SEND_CSD);
 278
 279         ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
 280         if (ret)
 281                 return ret;
 282
 283         for (i = 0;i < 4;i++)
 284                 csd[i] = be32_to_cpu(csd[i]);
 285
 286         return 0;
 287 }
 288
 289 int mmc_send_cid(struct mmc_host *host, u32 *cid)
 290 {
 291         int ret, i;
 292
 293         if (!mmc_host_is_spi(host)) {
 294                 if (!host->card)
 295                         return -EINVAL;
 296                 return mmc_send_cxd_native(host, host->card->rca << 16,
 297                                 cid, MMC_SEND_CID);
 298         }
 299
 300         ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
 301         if (ret)
 302                 return ret;
 303
 304         for (i = 0;i < 4;i++)
 305                 cid[i] = be32_to_cpu(cid[i]);
 306
 307         return 0;
 308 }
 309
 310 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 311 {
 312         return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
 313                         ext_csd, 512);
 314 }
 315
 316 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
 317 {
 318         struct mmc_command cmd;
 319         int err;
 320
 321         memset(&cmd, 0, sizeof(struct mmc_command));
 322
 323         cmd.opcode = MMC_SPI_READ_OCR;
 324         cmd.arg = highcap ? (1 << 30) : 0;
 325         cmd.flags = MMC_RSP_SPI_R3;
 326
 327         err = mmc_wait_for_cmd(host, &cmd, 0);
 328
 329         *ocrp = cmd.resp[1];
 330         return err;
 331 }
 332
 333 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
 334 {
 335         struct mmc_command cmd;
 336         int err;
 337
 338         memset(&cmd, 0, sizeof(struct mmc_command));
 339
 340         cmd.opcode = MMC_SPI_CRC_ON_OFF;
 341         cmd.flags = MMC_RSP_SPI_R1;
 342         cmd.arg = use_crc;
 343
 344         err = mmc_wait_for_cmd(host, &cmd, 0);
 345         if (!err)
 346                 host->use_spi_crc = use_crc;
 347         return err;
 348 }
 349
 350 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
 351 {
 352         int err;
 353         struct mmc_command cmd;
 354
 355         BUG_ON(!card);
 356         BUG_ON(!card->host);
 357
 358         memset(&cmd, 0, sizeof(struct mmc_command));
 359
 360         cmd.opcode = MMC_SWITCH;
 361         cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 362                   (index << 16) |
 363                   (value << 8) |
 364                   set;
 365         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 366
 367         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 368         if (err)
 369                 return err;
 370
 371         return 0;
 372 }
 373
 374 int mmc_send_status(struct mmc_card *card, u32 *status)
 375 {
 376         int err;
 377         struct mmc_command cmd;
 378
 379         BUG_ON(!card);
 380         BUG_ON(!card->host);
 381
 382         memset(&cmd, 0, sizeof(struct mmc_command));
 383
 384         cmd.opcode = MMC_SEND_STATUS;
 385         if (!mmc_host_is_spi(card->host))
 386                 cmd.arg = card->rca << 16;
 387         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 388
 389         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 390         if (err)
 391                 return err;
 392
 393         /* NOTE: callers are required to understand the difference
 394          * between "native" and SPI format status words!
 395          */
 396         if (status)
 397                 *status = cmd.resp[0];
 398
 399         return 0;
 400 }
 401