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         if (WARN_ON(card && card->host != host))
  31                 return -EINVAL;
  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         if (retries < 0)
  76                 retries = MMC_CMD_RETRIES;
  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         cmd.opcode = SD_APP_SET_BUS_WIDTH;
 126         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 127
 128         switch (width) {
 129         case MMC_BUS_WIDTH_1:
 130                 cmd.arg = SD_BUS_WIDTH_1;
 131                 break;
 132         case MMC_BUS_WIDTH_4:
 133                 cmd.arg = SD_BUS_WIDTH_4;
 134                 break;
 135         default:
 136                 return -EINVAL;
 137         }
 138
 139         return mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 140 }
 141
 142 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 143 {
 144         struct mmc_command cmd = {0};
 145         int i, err = 0;
 146
 147         cmd.opcode = SD_APP_OP_COND;
 148         if (mmc_host_is_spi(host))
 149                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 150         else
 151                 cmd.arg = ocr;
 152         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 153
 154         for (i = 100; i; i--) {
 155                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 156                 if (err)
 157                         break;
 158
 159                 /* if we're just probing, do a single pass */
 160                 if (ocr == 0)
 161                         break;
 162
 163                 /* otherwise wait until reset completes */
 164                 if (mmc_host_is_spi(host)) {
 165                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 166                                 break;
 167                 } else {
 168                         if (cmd.resp[0] & MMC_CARD_BUSY)
 169                                 break;
 170                 }
 171
 172                 err = -ETIMEDOUT;
 173
 174                 mmc_delay(10);
 175         }
 176
 177         if (!i)
 178                 pr_err("%s: card never left busy state\n", mmc_hostname(host));
 179
 180         if (rocr && !mmc_host_is_spi(host))
 181                 *rocr = cmd.resp[0];
 182
 183         return err;
 184 }
 185
 186 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 187 {
 188         struct mmc_command cmd = {0};
 189         int err;
 190         static const u8 test_pattern = 0xAA;
 191         u8 result_pattern;
 192
 193         /*
 194          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 195          * before SD_APP_OP_COND. This command will harmlessly fail for
 196          * SD 1.0 cards.
 197          */
 198         cmd.opcode = SD_SEND_IF_COND;
 199         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 200         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 201
 202         err = mmc_wait_for_cmd(host, &cmd, 0);
 203         if (err)
 204                 return err;
 205
 206         if (mmc_host_is_spi(host))
 207                 result_pattern = cmd.resp[1] & 0xFF;
 208         else
 209                 result_pattern = cmd.resp[0] & 0xFF;
 210
 211         if (result_pattern != test_pattern)
 212                 return -EIO;
 213
 214         return 0;
 215 }
 216
 217 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 218 {
 219         int err;
 220         struct mmc_command cmd = {0};
 221
 222         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 223         cmd.arg = 0;
 224         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 225
 226         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 227         if (err)
 228                 return err;
 229
 230         *rca = cmd.resp[0] >> 16;
 231
 232         return 0;
 233 }
 234
 235 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 236 {
 237         int err;
 238         struct mmc_request mrq = {NULL};
 239         struct mmc_command cmd = {0};
 240         struct mmc_data data = {0};
 241         struct scatterlist sg;
 242         void *data_buf;
 243
 244         /* NOTE: caller guarantees scr is heap-allocated */
 245
 246         err = mmc_app_cmd(card->host, card);
 247         if (err)
 248                 return err;
 249
 250         /* dma onto stack is unsafe/nonportable, but callers to this
 251          * routine normally provide temporary on-stack buffers ...
 252          */
 253         data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
 254         if (data_buf == NULL)
 255                 return -ENOMEM;
 256
 257         mrq.cmd = &cmd;
 258         mrq.data = &data;
 259
 260         cmd.opcode = SD_APP_SEND_SCR;
 261         cmd.arg = 0;
 262         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 263
 264         data.blksz = 8;
 265         data.blocks = 1;
 266         data.flags = MMC_DATA_READ;
 267         data.sg = &sg;
 268         data.sg_len = 1;
 269
 270         sg_init_one(&sg, data_buf, 8);
 271
 272         mmc_set_data_timeout(&data, card);
 273
 274         mmc_wait_for_req(card->host, &mrq);
 275
 276         memcpy(scr, data_buf, sizeof(card->raw_scr));
 277         kfree(data_buf);
 278
 279         if (cmd.error)
 280                 return cmd.error;
 281         if (data.error)
 282                 return data.error;
 283
 284         scr[0] = be32_to_cpu(scr[0]);
 285         scr[1] = be32_to_cpu(scr[1]);
 286
 287         return 0;
 288 }
 289
 290 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 291         u8 value, u8 *resp)
 292 {
 293         struct mmc_request mrq = {NULL};
 294         struct mmc_command cmd = {0};
 295         struct mmc_data data = {0};
 296         struct scatterlist sg;
 297
 298         /* NOTE: caller guarantees resp is heap-allocated */
 299
 300         mode = !!mode;
 301         value &= 0xF;
 302
 303         mrq.cmd = &cmd;
 304         mrq.data = &data;
 305
 306         cmd.opcode = SD_SWITCH;
 307         cmd.arg = mode << 31 | 0x00FFFFFF;
 308         cmd.arg &= ~(0xF << (group * 4));
 309         cmd.arg |= value << (group * 4);
 310         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 311
 312         data.blksz = 64;
 313         data.blocks = 1;
 314         data.flags = MMC_DATA_READ;
 315         data.sg = &sg;
 316         data.sg_len = 1;
 317
 318         sg_init_one(&sg, resp, 64);
 319
 320         mmc_set_data_timeout(&data, card);
 321
 322         mmc_wait_for_req(card->host, &mrq);
 323
 324         if (cmd.error)
 325                 return cmd.error;
 326         if (data.error)
 327                 return data.error;
 328
 329         return 0;
 330 }
 331
 332 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 333 {
 334         int err;
 335         struct mmc_request mrq = {NULL};
 336         struct mmc_command cmd = {0};
 337         struct mmc_data data = {0};
 338         struct scatterlist sg;
 339
 340         /* NOTE: caller guarantees ssr is heap-allocated */
 341
 342         err = mmc_app_cmd(card->host, card);
 343         if (err)
 344                 return err;
 345
 346         mrq.cmd = &cmd;
 347         mrq.data = &data;
 348
 349         cmd.opcode = SD_APP_SD_STATUS;
 350         cmd.arg = 0;
 351         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
 352
 353         data.blksz = 64;
 354         data.blocks = 1;
 355         data.flags = MMC_DATA_READ;
 356         data.sg = &sg;
 357         data.sg_len = 1;
 358
 359         sg_init_one(&sg, ssr, 64);
 360
 361         mmc_set_data_timeout(&data, card);
 362
 363         mmc_wait_for_req(card->host, &mrq);
 364
 365         if (cmd.error)
 366                 return cmd.error;
 367         if (data.error)
 368                 return data.error;
 369
 370         return 0;
 371 }