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         struct mmc_command cmd = {0};
 124
 125         BUG_ON(!card);
 126         BUG_ON(!card->host);
 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         return mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 143 }
 144
 145 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 146 {
 147         struct mmc_command cmd = {0};
 148         int i, err = 0;
 149
 150         BUG_ON(!host);
 151
 152         cmd.opcode = SD_APP_OP_COND;
 153         if (mmc_host_is_spi(host))
 154                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 155         else
 156                 cmd.arg = ocr;
 157         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 158
 159         for (i = 100; i; i--) {
 160                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 161                 if (err)
 162                         break;
 163
 164                 /* if we're just probing, do a single pass */
 165                 if (ocr == 0)
 166                         break;
 167
 168                 /* otherwise wait until reset completes */
 169                 if (mmc_host_is_spi(host)) {
 170                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 171                                 break;
 172                 } else {
 173                         if (cmd.resp[0] & MMC_CARD_BUSY)
 174                                 break;
 175                 }
 176
 177                 err = -ETIMEDOUT;
 178
 179                 mmc_delay(10);
 180         }
 181
 182         if (!i)
 183                 pr_err("%s: card never left busy state\n", mmc_hostname(host));
 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 = {NULL};
 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         mrq.cmd = &cmd;
 270         mrq.data = &data;
 271
 272         cmd.opcode = SD_APP_SEND_SCR;
 273         cmd.arg = 0;
 274         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 275
 276         data.blksz = 8;
 277         data.blocks = 1;
 278         data.flags = MMC_DATA_READ;
 279         data.sg = &sg;
 280         data.sg_len = 1;
 281
 282         sg_init_one(&sg, data_buf, 8);
 283
 284         mmc_set_data_timeout(&data, card);
 285
 286         mmc_wait_for_req(card->host, &mrq);
 287
 288         memcpy(scr, data_buf, sizeof(card->raw_scr));
 289         kfree(data_buf);
 290
 291         if (cmd.error)
 292                 return cmd.error;
 293         if (data.error)
 294                 return data.error;
 295
 296         scr[0] = be32_to_cpu(scr[0]);
 297         scr[1] = be32_to_cpu(scr[1]);
 298
 299         return 0;
 300 }
 301
 302 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 303         u8 value, u8 *resp)
 304 {
 305         struct mmc_request mrq = {NULL};
 306         struct mmc_command cmd = {0};
 307         struct mmc_data data = {0};
 308         struct scatterlist sg;
 309
 310         BUG_ON(!card);
 311         BUG_ON(!card->host);
 312
 313         /* NOTE: caller guarantees resp is heap-allocated */
 314
 315         mode = !!mode;
 316         value &= 0xF;
 317
 318         mrq.cmd = &cmd;
 319         mrq.data = &data;
 320
 321         cmd.opcode = SD_SWITCH;
 322         cmd.arg = mode << 31 | 0x00FFFFFF;
 323         cmd.arg &= ~(0xF << (group * 4));
 324         cmd.arg |= value << (group * 4);
 325         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 326
 327         data.blksz = 64;
 328         data.blocks = 1;
 329         data.flags = MMC_DATA_READ;
 330         data.sg = &sg;
 331         data.sg_len = 1;
 332
 333         sg_init_one(&sg, resp, 64);
 334
 335         mmc_set_data_timeout(&data, card);
 336
 337         mmc_wait_for_req(card->host, &mrq);
 338
 339         if (cmd.error)
 340                 return cmd.error;
 341         if (data.error)
 342                 return data.error;
 343
 344         return 0;
 345 }
 346
 347 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 348 {
 349         int err;
 350         struct mmc_request mrq = {NULL};
 351         struct mmc_command cmd = {0};
 352         struct mmc_data data = {0};
 353         struct scatterlist sg;
 354
 355         BUG_ON(!card);
 356         BUG_ON(!card->host);
 357         BUG_ON(!ssr);
 358
 359         /* NOTE: caller guarantees ssr is heap-allocated */
 360
 361         err = mmc_app_cmd(card->host, card);
 362         if (err)
 363                 return err;
 364
 365         mrq.cmd = &cmd;
 366         mrq.data = &data;
 367
 368         cmd.opcode = SD_APP_SD_STATUS;
 369         cmd.arg = 0;
 370         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
 371
 372         data.blksz = 64;
 373         data.blocks = 1;
 374         data.flags = MMC_DATA_READ;
 375         data.sg = &sg;
 376         data.sg_len = 1;
 377
 378         sg_init_one(&sg, ssr, 64);
 379
 380         mmc_set_data_timeout(&data, card);
 381
 382         mmc_wait_for_req(card->host, &mrq);
 383
 384         if (cmd.error)
 385                 return cmd.error;
 386         if (data.error)
 387                 return data.error;
 388
 389         return 0;
 390 }