drivers/mmc/core/sd_ops.c

   1 /*
   2  *  linux/drivers/mmc/core/sd_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 #include <linux/mmc/sd.h>
  19
  20 #include "core.h"
  21 #include "sd_ops.h"
  22
  23 static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
  24 {
  25         int err;
  26         struct mmc_command cmd;
  27
  28         BUG_ON(!host);
  29         BUG_ON(card && (card->host != host));
  30
  31         cmd.opcode = MMC_APP_CMD;
  32
  33         if (card) {
  34                 cmd.arg = card->rca << 16;
  35                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
  36         } else {
  37                 cmd.arg = 0;
  38                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
  39         }
  40
  41         err = mmc_wait_for_cmd(host, &cmd, 0);
  42         if (err)
  43                 return err;
  44
  45         /* Check that card supported application commands */
  46         if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
  47                 return -EOPNOTSUPP;
  48
  49         return 0;
  50 }
  51
  52 /**
  53  *      mmc_wait_for_app_cmd - start an application command and wait for
  54                                completion
  55  *      @host: MMC host to start command
  56  *      @card: Card to send MMC_APP_CMD to
  57  *      @cmd: MMC command to start
  58  *      @retries: maximum number of retries
  59  *
  60  *      Sends a MMC_APP_CMD, checks the card response, sends the command
  61  *      in the parameter and waits for it to complete. Return any error
  62  *      that occurred while the command was executing.  Do not attempt to
  63  *      parse the response.
  64  */
  65 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
  66         struct mmc_command *cmd, int retries)
  67 {
  68         struct mmc_request mrq;
  69
  70         int i, err;
  71
  72         BUG_ON(!cmd);
  73         BUG_ON(retries < 0);
  74
  75         err = -EIO;
  76
  77         /*
  78          * We have to resend MMC_APP_CMD for each attempt so
  79          * we cannot use the retries field in mmc_command.
  80          */
  81         for (i = 0;i <= retries;i++) {
  82                 err = mmc_app_cmd(host, card);
  83                 if (err) {
  84                         /* no point in retrying; no APP commands allowed */
  85                         if (mmc_host_is_spi(host)) {
  86                                 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
  87                                         break;
  88                         }
  89                         continue;
  90                 }
  91
  92                 memset(&mrq, 0, sizeof(struct mmc_request));
  93
  94                 memset(cmd->resp, 0, sizeof(cmd->resp));
  95                 cmd->retries = 0;
  96
  97                 mrq.cmd = cmd;
  98                 cmd->data = NULL;
  99
 100                 mmc_wait_for_req(host, &mrq);
 101
 102                 err = cmd->error;
 103                 if (!cmd->error)
 104                         break;
 105
 106                 /* no point in retrying illegal APP commands */
 107                 if (mmc_host_is_spi(host)) {
 108                         if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
 109                                 break;
 110                 }
 111         }
 112
 113         return err;
 114 }
 115
 116 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
 117
 118 int mmc_app_set_bus_width(struct mmc_card *card, int width)
 119 {
 120         int err;
 121         struct mmc_command cmd;
 122
 123         BUG_ON(!card);
 124         BUG_ON(!card->host);
 125
 126         memset(&cmd, 0, sizeof(struct mmc_command));
 127
 128         cmd.opcode = SD_APP_SET_BUS_WIDTH;
 129         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 130
 131         switch (width) {
 132         case MMC_BUS_WIDTH_1:
 133                 cmd.arg = SD_BUS_WIDTH_1;
 134                 break;
 135         case MMC_BUS_WIDTH_4:
 136                 cmd.arg = SD_BUS_WIDTH_4;
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 143         if (err)
 144                 return err;
 145
 146         return 0;
 147 }
 148
 149 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 150 {
 151         struct mmc_command cmd;
 152         int i, err = 0;
 153
 154         BUG_ON(!host);
 155
 156         memset(&cmd, 0, sizeof(struct mmc_command));
 157
 158         cmd.opcode = SD_APP_OP_COND;
 159         if (mmc_host_is_spi(host))
 160                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 161         else
 162                 cmd.arg = ocr;
 163         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 164
 165         for (i = 100; i; i--) {
 166                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 167                 if (err)
 168                         break;
 169
 170                 /* if we're just probing, do a single pass */
 171                 if (ocr == 0)
 172                         break;
 173
 174                 /* otherwise wait until reset completes */
 175                 if (mmc_host_is_spi(host)) {
 176                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 177                                 break;
 178                 } else {
 179                         if (cmd.resp[0] & MMC_CARD_BUSY)
 180                                 break;
 181                 }
 182
 183                 err = -ETIMEDOUT;
 184
 185                 mmc_delay(10);
 186         }
 187
 188         if (rocr && !mmc_host_is_spi(host))
 189                 *rocr = cmd.resp[0];
 190
 191         return err;
 192 }
 193
 194 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 195 {
 196         struct mmc_command cmd;
 197         int err;
 198         static const u8 test_pattern = 0xAA;
 199         u8 result_pattern;
 200
 201         /*
 202          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 203          * before SD_APP_OP_COND. This command will harmlessly fail for
 204          * SD 1.0 cards.
 205          */
 206         cmd.opcode = SD_SEND_IF_COND;
 207         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 208         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 209
 210         err = mmc_wait_for_cmd(host, &cmd, 0);
 211         if (err)
 212                 return err;
 213
 214         if (mmc_host_is_spi(host))
 215                 result_pattern = cmd.resp[1] & 0xFF;
 216         else
 217                 result_pattern = cmd.resp[0] & 0xFF;
 218
 219         if (result_pattern != test_pattern)
 220                 return -EIO;
 221
 222         return 0;
 223 }
 224
 225 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 226 {
 227         int err;
 228         struct mmc_command cmd;
 229
 230         BUG_ON(!host);
 231         BUG_ON(!rca);
 232
 233         memset(&cmd, 0, sizeof(struct mmc_command));
 234
 235         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 236         cmd.arg = 0;
 237         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 238
 239         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 240         if (err)
 241                 return err;
 242
 243         *rca = cmd.resp[0] >> 16;
 244
 245         return 0;
 246 }
 247
 248 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 249 {
 250         int err;
 251         struct mmc_request mrq;
 252         struct mmc_command cmd;
 253         struct mmc_data data;
 254         struct scatterlist sg;
 255
 256         BUG_ON(!card);
 257         BUG_ON(!card->host);
 258         BUG_ON(!scr);
 259
 260         /* NOTE: caller guarantees scr is heap-allocated */
 261
 262         err = mmc_app_cmd(card->host, card);
 263         if (err)
 264                 return err;
 265
 266         memset(&mrq, 0, sizeof(struct mmc_request));
 267         memset(&cmd, 0, sizeof(struct mmc_command));
 268         memset(&data, 0, sizeof(struct mmc_data));
 269
 270         mrq.cmd = &cmd;
 271         mrq.data = &data;
 272
 273         cmd.opcode = SD_APP_SEND_SCR;
 274         cmd.arg = 0;
 275         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 276
 277         data.blksz = 8;
 278         data.blocks = 1;
 279         data.flags = MMC_DATA_READ;
 280         data.sg = &sg;
 281         data.sg_len = 1;
 282
 283         sg_init_one(&sg, scr, 8);
 284
 285         mmc_set_data_timeout(&data, card);
 286
 287         mmc_wait_for_req(card->host, &mrq);
 288
 289         if (cmd.error)
 290                 return cmd.error;
 291         if (data.error)
 292                 return data.error;
 293
 294         scr[0] = be32_to_cpu(scr[0]);
 295         scr[1] = be32_to_cpu(scr[1]);
 296
 297         return 0;
 298 }
 299
 300 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 301         u8 value, u8 *resp)
 302 {
 303         struct mmc_request mrq;
 304         struct mmc_command cmd;
 305         struct mmc_data data;
 306         struct scatterlist sg;
 307
 308         BUG_ON(!card);
 309         BUG_ON(!card->host);
 310
 311         /* NOTE: caller guarantees resp is heap-allocated */
 312
 313         mode = !!mode;
 314         value &= 0xF;
 315
 316         memset(&mrq, 0, sizeof(struct mmc_request));
 317         memset(&cmd, 0, sizeof(struct mmc_command));
 318         memset(&data, 0, sizeof(struct mmc_data));
 319
 320         mrq.cmd = &cmd;
 321         mrq.data = &data;
 322
 323         cmd.opcode = SD_SWITCH;
 324         cmd.arg = mode << 31 | 0x00FFFFFF;
 325         cmd.arg &= ~(0xF << (group * 4));
 326         cmd.arg |= value << (group * 4);
 327         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 328
 329         data.blksz = 64;
 330         data.blocks = 1;
 331         data.flags = MMC_DATA_READ;
 332         data.sg = &sg;
 333         data.sg_len = 1;
 334
 335         sg_init_one(&sg, resp, 64);
 336
 337         mmc_set_data_timeout(&data, card);
 338
 339         mmc_wait_for_req(card->host, &mrq);
 340
 341         if (cmd.error)
 342                 return cmd.error;
 343         if (data.error)
 344                 return data.error;
 345
 346         return 0;
 347 }
 348
 349 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 350 {
 351         int err;
 352         struct mmc_request mrq;
 353         struct mmc_command cmd;
 354         struct mmc_data data;
 355         struct scatterlist sg;
 356
 357         BUG_ON(!card);
 358         BUG_ON(!card->host);
 359         BUG_ON(!ssr);
 360
 361         /* NOTE: caller guarantees ssr is heap-allocated */
 362
 363         err = mmc_app_cmd(card->host, card);
 364         if (err)
 365                 return err;
 366
 367         memset(&mrq, 0, sizeof(struct mmc_request));
 368         memset(&cmd, 0, sizeof(struct mmc_command));
 369         memset(&data, 0, sizeof(struct mmc_data));
 370
 371         mrq.cmd = &cmd;
 372         mrq.data = &data;
 373
 374         cmd.opcode = SD_APP_SD_STATUS;
 375         cmd.arg = 0;
 376         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
 377
 378         data.blksz = 64;
 379         data.blocks = 1;
 380         data.flags = MMC_DATA_READ;
 381         data.sg = &sg;
 382         data.sg_len = 1;
 383
 384         sg_init_one(&sg, ssr, 64);
 385
 386         mmc_set_data_timeout(&data, card);
 387
 388         mmc_wait_for_req(card->host, &mrq);
 389
 390         if (cmd.error)
 391                 return cmd.error;
 392         if (data.error)
 393                 return data.error;
 394
 395         return 0;
 396 }