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/export.h>
  15 #include <linux/scatterlist.h>
  16
  17 #include <linux/mmc/host.h>
  18 #include <linux/mmc/card.h>
  19 #include <linux/mmc/mmc.h>
  20 #include <linux/mmc/sd.h>
  21
  22 #include "core.h"
  23 #include "sd_ops.h"
  24
  25 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
  26 {
  27         int err;
  28         struct mmc_command cmd = {0};
  29
  30         BUG_ON(!host);
  31         BUG_ON(card && (card->host != host));
  32
  33         cmd.opcode = MMC_APP_CMD;
  34
  35         if (card) {
  36                 cmd.arg = card->rca << 16;
  37                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
  38         } else {
  39                 cmd.arg = 0;
  40                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
  41         }
  42
  43         err = mmc_wait_for_cmd(host, &cmd, 0);
  44         if (err)
  45                 return err;
  46
  47         /* Check that card supported application commands */
  48         if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
  49                 return -EOPNOTSUPP;
  50
  51         return 0;
  52 }
  53 EXPORT_SYMBOL_GPL(mmc_app_cmd);
  54
  55 /**
  56  *      mmc_wait_for_app_cmd - start an application command and wait for
  57                                completion
  58  *      @host: MMC host to start command
  59  *      @card: Card to send MMC_APP_CMD to
  60  *      @cmd: MMC command to start
  61  *      @retries: maximum number of retries
  62  *
  63  *      Sends a MMC_APP_CMD, checks the card response, sends the command
  64  *      in the parameter and waits for it to complete. Return any error
  65  *      that occurred while the command was executing.  Do not attempt to
  66  *      parse the response.
  67  */
  68 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
  69         struct mmc_command *cmd, int retries)
  70 {
  71         struct mmc_request mrq = {NULL};
  72
  73         int i, err;
  74
  75         BUG_ON(!cmd);
  76         BUG_ON(retries < 0);
  77
  78         err = -EIO;
  79
  80         /*
  81          * We have to resend MMC_APP_CMD for each attempt so
  82          * we cannot use the retries field in mmc_command.
  83          */
  84         for (i = 0;i <= retries;i++) {
  85                 err = mmc_app_cmd(host, card);
  86                 if (err) {
  87                         /* no point in retrying; no APP commands allowed */
  88                         if (mmc_host_is_spi(host)) {
  89                                 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
  90                                         break;
  91                         }
  92                         continue;
  93                 }
  94
  95                 memset(&mrq, 0, sizeof(struct mmc_request));
  96
  97                 memset(cmd->resp, 0, sizeof(cmd->resp));
  98                 cmd->retries = 0;
  99
 100                 mrq.cmd = cmd;
 101                 cmd->data = NULL;
 102
 103                 mmc_wait_for_req(host, &mrq);
 104
 105                 err = cmd->error;
 106                 if (!cmd->error)
 107                         break;
 108
 109                 /* no point in retrying illegal APP commands */
 110                 if (mmc_host_is_spi(host)) {
 111                         if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
 112                                 break;
 113                 }
 114         }
 115
 116         return err;
 117 }
 118
 119 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
 120
 121 int mmc_app_set_bus_width(struct mmc_card *card, int width)
 122 {
 123         int err;
 124         struct mmc_command cmd = {0};
 125
 126         BUG_ON(!card);
 127         BUG_ON(!card->host);
 128
 129         cmd.opcode = SD_APP_SET_BUS_WIDTH;
 130         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 131
 132         switch (width) {
 133         case MMC_BUS_WIDTH_1:
 134                 cmd.arg = SD_BUS_WIDTH_1;
 135                 break;
 136         case MMC_BUS_WIDTH_4:
 137                 cmd.arg = SD_BUS_WIDTH_4;
 138                 break;
 139         default:
 140                 return -EINVAL;
 141         }
 142
 143         err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 144         if (err)
 145                 return err;
 146
 147         return 0;
 148 }
 149
 150 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 151 {
 152         struct mmc_command cmd = {0};
 153         int i, err = 0;
 154
 155         BUG_ON(!host);
 156
 157         cmd.opcode = SD_APP_OP_COND;
 158         if (mmc_host_is_spi(host))
 159                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 160         else
 161                 cmd.arg = ocr;
 162         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 163
 164         for (i = 100; i; i--) {
 165                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 166                 if (err)
 167                         break;
 168
 169                 /* if we're just probing, do a single pass */
 170                 if (ocr == 0)
 171                         break;
 172
 173                 /* otherwise wait until reset completes */
 174                 if (mmc_host_is_spi(host)) {
 175                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 176                                 break;
 177                 } else {
 178                         if (cmd.resp[0] & MMC_CARD_BUSY)
 179                                 break;
 180                 }
 181
 182                 err = -ETIMEDOUT;
 183
 184                 mmc_delay(10);
 185         }
 186
 187         if (rocr && !mmc_host_is_spi(host))
 188                 *rocr = cmd.resp[0];
 189
 190         return err;
 191 }
 192
 193 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 194 {
 195         struct mmc_command cmd = {0};
 196         int err;
 197         static const u8 test_pattern = 0xAA;
 198         u8 result_pattern;
 199
 200         /*
 201          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 202          * before SD_APP_OP_COND. This command will harmlessly fail for
 203          * SD 1.0 cards.
 204          */
 205         cmd.opcode = SD_SEND_IF_COND;
 206         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 207         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 208
 209         err = mmc_wait_for_cmd(host, &cmd, 0);
 210         if (err)
 211                 return err;
 212
 213         if (mmc_host_is_spi(host))
 214                 result_pattern = cmd.resp[1] & 0xFF;
 215         else
 216                 result_pattern = cmd.resp[0] & 0xFF;
 217
 218         if (result_pattern != test_pattern)
 219                 return -EIO;
 220
 221         return 0;
 222 }
 223
 224 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 225 {
 226         int err;
 227         struct mmc_command cmd = {0};
 228
 229         BUG_ON(!host);
 230         BUG_ON(!rca);
 231
 232         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 233         cmd.arg = 0;
 234         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 235
 236         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 237         if (err)
 238                 return err;
 239
 240         *rca = cmd.resp[0] >> 16;
 241
 242         return 0;
 243 }
 244
 245 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 246 {
 247         int err;
 248         struct mmc_request mrq = {NULL};
 249         struct mmc_command cmd = {0};
 250         struct mmc_data data = {0};
 251         struct scatterlist sg;
 252         void *data_buf;
 253
 254         BUG_ON(!card);
 255         BUG_ON(!card->host);
 256         BUG_ON(!scr);
 257
 258         /* NOTE: caller guarantees scr is heap-allocated */
 259
 260         err = mmc_app_cmd(card->host, card);
 261         if (err)
 262                 return err;
 263
 264         /* dma onto stack is unsafe/nonportable, but callers to this
 265          * routine normally provide temporary on-stack buffers ...
 266          */
 267         data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
 268         if (data_buf == NULL)
 269                 return -ENOMEM;
 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 = {NULL};
 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         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 = {NULL};
 353         struct mmc_command cmd = {0};
 354         struct mmc_data data = {0};
 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         mrq.cmd = &cmd;
 368         mrq.data = &data;
 369
 370         cmd.opcode = SD_APP_SD_STATUS;
 371         cmd.arg = 0;
 372         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
 373
 374         data.blksz = 64;
 375         data.blocks = 1;
 376         data.flags = MMC_DATA_READ;
 377         data.sg = &sg;
 378         data.sg_len = 1;
 379
 380         sg_init_one(&sg, ssr, 64);
 381
 382         mmc_set_data_timeout(&data, card);
 383
 384         mmc_wait_for_req(card->host, &mrq);
 385
 386         if (cmd.error)
 387                 return cmd.error;
 388         if (data.error)
 389                 return data.error;
 390
 391         return 0;
 392 }