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;
  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;
 123
 124         BUG_ON(!card);
 125         BUG_ON(!card->host);
 126
 127         memset(&cmd, 0, sizeof(struct mmc_command));
 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;
 153         int i, err = 0;
 154
 155         BUG_ON(!host);
 156
 157         memset(&cmd, 0, sizeof(struct mmc_command));
 158
 159         cmd.opcode = SD_APP_OP_COND;
 160         if (mmc_host_is_spi(host))
 161                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 162         else
 163                 cmd.arg = ocr;
 164         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 165
 166         for (i = 100; i; i--) {
 167                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 168                 if (err)
 169                         break;
 170
 171                 /* if we're just probing, do a single pass */
 172                 if (ocr == 0)
 173                         break;
 174
 175                 /* otherwise wait until reset completes */
 176                 if (mmc_host_is_spi(host)) {
 177                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 178                                 break;
 179                 } else {
 180                         if (cmd.resp[0] & MMC_CARD_BUSY)
 181                                 break;
 182                 }
 183
 184                 err = -ETIMEDOUT;
 185
 186                 mmc_delay(10);
 187         }
 188
 189         if (rocr && !mmc_host_is_spi(host))
 190                 *rocr = cmd.resp[0];
 191
 192         return err;
 193 }
 194
 195 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 196 {
 197         struct mmc_command cmd;
 198         int err;
 199         static const u8 test_pattern = 0xAA;
 200         u8 result_pattern;
 201
 202         /*
 203          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 204          * before SD_APP_OP_COND. This command will harmlessly fail for
 205          * SD 1.0 cards.
 206          */
 207         cmd.opcode = SD_SEND_IF_COND;
 208         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 209         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 210
 211         err = mmc_wait_for_cmd(host, &cmd, 0);
 212         if (err)
 213                 return err;
 214
 215         if (mmc_host_is_spi(host))
 216                 result_pattern = cmd.resp[1] & 0xFF;
 217         else
 218                 result_pattern = cmd.resp[0] & 0xFF;
 219
 220         if (result_pattern != test_pattern)
 221                 return -EIO;
 222
 223         return 0;
 224 }
 225
 226 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 227 {
 228         int err;
 229         struct mmc_command cmd;
 230
 231         BUG_ON(!host);
 232         BUG_ON(!rca);
 233
 234         memset(&cmd, 0, sizeof(struct mmc_command));
 235
 236         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 237         cmd.arg = 0;
 238         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 239
 240         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 241         if (err)
 242                 return err;
 243
 244         *rca = cmd.resp[0] >> 16;
 245
 246         return 0;
 247 }
 248
 249 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 250 {
 251         int err;
 252         struct mmc_request mrq;
 253         struct mmc_command cmd;
 254         struct mmc_data data;
 255         struct scatterlist sg;
 256         void *data_buf;
 257
 258         BUG_ON(!card);
 259         BUG_ON(!card->host);
 260         BUG_ON(!scr);
 261
 262         /* NOTE: caller guarantees scr is heap-allocated */
 263
 264         err = mmc_app_cmd(card->host, card);
 265         if (err)
 266                 return err;
 267
 268         /* dma onto stack is unsafe/nonportable, but callers to this
 269          * routine normally provide temporary on-stack buffers ...
 270          */
 271         data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
 272         if (data_buf == NULL)
 273                 return -ENOMEM;
 274
 275         memset(&mrq, 0, sizeof(struct mmc_request));
 276         memset(&cmd, 0, sizeof(struct mmc_command));
 277         memset(&data, 0, sizeof(struct mmc_data));
 278
 279         mrq.cmd = &cmd;
 280         mrq.data = &data;
 281
 282         cmd.opcode = SD_APP_SEND_SCR;
 283         cmd.arg = 0;
 284         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 285
 286         data.blksz = 8;
 287         data.blocks = 1;
 288         data.flags = MMC_DATA_READ;
 289         data.sg = &sg;
 290         data.sg_len = 1;
 291
 292         sg_init_one(&sg, data_buf, 8);
 293
 294         mmc_set_data_timeout(&data, card);
 295
 296         mmc_wait_for_req(card->host, &mrq);
 297
 298         memcpy(scr, data_buf, sizeof(card->raw_scr));
 299         kfree(data_buf);
 300
 301         if (cmd.error)
 302                 return cmd.error;
 303         if (data.error)
 304                 return data.error;
 305
 306         scr[0] = be32_to_cpu(scr[0]);
 307         scr[1] = be32_to_cpu(scr[1]);
 308
 309         return 0;
 310 }
 311
 312 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 313         u8 value, u8 *resp)
 314 {
 315         struct mmc_request mrq;
 316         struct mmc_command cmd;
 317         struct mmc_data data;
 318         struct scatterlist sg;
 319
 320         BUG_ON(!card);
 321         BUG_ON(!card->host);
 322
 323         /* NOTE: caller guarantees resp is heap-allocated */
 324
 325         mode = !!mode;
 326         value &= 0xF;
 327
 328         memset(&mrq, 0, sizeof(struct mmc_request));
 329         memset(&cmd, 0, sizeof(struct mmc_command));
 330         memset(&data, 0, sizeof(struct mmc_data));
 331
 332         mrq.cmd = &cmd;
 333         mrq.data = &data;
 334
 335         cmd.opcode = SD_SWITCH;
 336         cmd.arg = mode << 31 | 0x00FFFFFF;
 337         cmd.arg &= ~(0xF << (group * 4));
 338         cmd.arg |= value << (group * 4);
 339         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 340
 341         data.blksz = 64;
 342         data.blocks = 1;
 343         data.flags = MMC_DATA_READ;
 344         data.sg = &sg;
 345         data.sg_len = 1;
 346
 347         sg_init_one(&sg, resp, 64);
 348
 349         mmc_set_data_timeout(&data, card);
 350
 351         mmc_wait_for_req(card->host, &mrq);
 352
 353         if (cmd.error)
 354                 return cmd.error;
 355         if (data.error)
 356                 return data.error;
 357
 358         return 0;
 359 }
 360
 361 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 362 {
 363         int err;
 364         struct mmc_request mrq;
 365         struct mmc_command cmd;
 366         struct mmc_data data;
 367         struct scatterlist sg;
 368
 369         BUG_ON(!card);
 370         BUG_ON(!card->host);
 371         BUG_ON(!ssr);
 372
 373         /* NOTE: caller guarantees ssr is heap-allocated */
 374
 375         err = mmc_app_cmd(card->host, card);
 376         if (err)
 377                 return err;
 378
 379         memset(&mrq, 0, sizeof(struct mmc_request));
 380         memset(&cmd, 0, sizeof(struct mmc_command));
 381         memset(&data, 0, sizeof(struct mmc_data));
 382
 383         mrq.cmd = &cmd;
 384         mrq.data = &data;
 385
 386         cmd.opcode = SD_APP_SD_STATUS;
 387         cmd.arg = 0;
 388         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
 389
 390         data.blksz = 64;
 391         data.blocks = 1;
 392         data.flags = MMC_DATA_READ;
 393         data.sg = &sg;
 394         data.sg_len = 1;
 395
 396         sg_init_one(&sg, ssr, 64);
 397
 398         mmc_set_data_timeout(&data, card);
 399
 400         mmc_wait_for_req(card->host, &mrq);
 401
 402         if (cmd.error)
 403                 return cmd.error;
 404         if (data.error)
 405                 return data.error;
 406
 407         return 0;
 408 }