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