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/types.h>
  13 #include <asm/scatterlist.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                 memset(&mrq, 0, sizeof(struct mmc_request));
  84
  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;
 125
 126         BUG_ON(!card);
 127         BUG_ON(!card->host);
 128
 129         memset(&cmd, 0, sizeof(struct mmc_command));
 130
 131         cmd.opcode = SD_APP_SET_BUS_WIDTH;
 132         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 133
 134         switch (width) {
 135         case MMC_BUS_WIDTH_1:
 136                 cmd.arg = SD_BUS_WIDTH_1;
 137                 break;
 138         case MMC_BUS_WIDTH_4:
 139                 cmd.arg = SD_BUS_WIDTH_4;
 140                 break;
 141         default:
 142                 return -EINVAL;
 143         }
 144
 145         err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 146         if (err)
 147                 return err;
 148
 149         return 0;
 150 }
 151
 152 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 153 {
 154         struct mmc_command cmd;
 155         int i, err = 0;
 156
 157         BUG_ON(!host);
 158
 159         memset(&cmd, 0, sizeof(struct mmc_command));
 160
 161         cmd.opcode = SD_APP_OP_COND;
 162         if (mmc_host_is_spi(host))
 163                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 164         else
 165                 cmd.arg = ocr;
 166         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 167
 168         for (i = 100; i; i--) {
 169                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 170                 if (err)
 171                         break;
 172
 173                 /* if we're just probing, do a single pass */
 174                 if (ocr == 0)
 175                         break;
 176
 177                 /* otherwise wait until reset completes */
 178                 if (mmc_host_is_spi(host)) {
 179                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 180                                 break;
 181                 } else {
 182                         if (cmd.resp[0] & MMC_CARD_BUSY)
 183                                 break;
 184                 }
 185
 186                 err = -ETIMEDOUT;
 187
 188                 mmc_delay(10);
 189         }
 190
 191         if (rocr && !mmc_host_is_spi(host))
 192                 *rocr = cmd.resp[0];
 193
 194         return err;
 195 }
 196
 197 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 198 {
 199         struct mmc_command cmd;
 200         int err;
 201         static const u8 test_pattern = 0xAA;
 202         u8 result_pattern;
 203
 204         /*
 205          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 206          * before SD_APP_OP_COND. This command will harmlessly fail for
 207          * SD 1.0 cards.
 208          */
 209         cmd.opcode = SD_SEND_IF_COND;
 210         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 211         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 212
 213         err = mmc_wait_for_cmd(host, &cmd, 0);
 214         if (err)
 215                 return err;
 216
 217         if (mmc_host_is_spi(host))
 218                 result_pattern = cmd.resp[1] & 0xFF;
 219         else
 220                 result_pattern = cmd.resp[0] & 0xFF;
 221
 222         if (result_pattern != test_pattern)
 223                 return -EIO;
 224
 225         return 0;
 226 }
 227
 228 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 229 {
 230         int err;
 231         struct mmc_command cmd;
 232
 233         BUG_ON(!host);
 234         BUG_ON(!rca);
 235
 236         memset(&cmd, 0, sizeof(struct mmc_command));
 237
 238         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 239         cmd.arg = 0;
 240         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 241
 242         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 243         if (err)
 244                 return err;
 245
 246         *rca = cmd.resp[0] >> 16;
 247
 248         return 0;
 249 }
 250
 251 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 252 {
 253         int err;
 254         struct mmc_request mrq;
 255         struct mmc_command cmd;
 256         struct mmc_data data;
 257         struct scatterlist sg;
 258
 259         BUG_ON(!card);
 260         BUG_ON(!card->host);
 261         BUG_ON(!scr);
 262
 263         /* NOTE: caller guarantees scr is heap-allocated */
 264
 265         err = mmc_app_cmd(card->host, card);
 266         if (err)
 267                 return err;
 268
 269         memset(&mrq, 0, sizeof(struct mmc_request));
 270         memset(&cmd, 0, sizeof(struct mmc_command));
 271         memset(&data, 0, sizeof(struct mmc_data));
 272
 273         mrq.cmd = &cmd;
 274         mrq.data = &data;
 275
 276         cmd.opcode = SD_APP_SEND_SCR;
 277         cmd.arg = 0;
 278         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 279
 280         data.blksz = 8;
 281         data.blocks = 1;
 282         data.flags = MMC_DATA_READ;
 283         data.sg = &sg;
 284         data.sg_len = 1;
 285
 286         sg_init_one(&sg, scr, 8);
 287
 288         mmc_set_data_timeout(&data, card);
 289
 290         mmc_wait_for_req(card->host, &mrq);
 291
 292         if (cmd.error)
 293                 return cmd.error;
 294         if (data.error)
 295                 return data.error;
 296
 297         scr[0] = ntohl(scr[0]);
 298         scr[1] = ntohl(scr[1]);
 299
 300         return 0;
 301 }
 302
 303 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 304         u8 value, u8 *resp)
 305 {
 306         struct mmc_request mrq;
 307         struct mmc_command cmd;
 308         struct mmc_data data;
 309         struct scatterlist sg;
 310
 311         BUG_ON(!card);
 312         BUG_ON(!card->host);
 313
 314         /* NOTE: caller guarantees resp is heap-allocated */
 315
 316         mode = !!mode;
 317         value &= 0xF;
 318
 319         memset(&mrq, 0, sizeof(struct mmc_request));
 320         memset(&cmd, 0, sizeof(struct mmc_command));
 321         memset(&data, 0, sizeof(struct mmc_data));
 322
 323         mrq.cmd = &cmd;
 324         mrq.data = &data;
 325
 326         cmd.opcode = SD_SWITCH;
 327         cmd.arg = mode << 31 | 0x00FFFFFF;
 328         cmd.arg &= ~(0xF << (group * 4));
 329         cmd.arg |= value << (group * 4);
 330         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 331
 332         data.blksz = 64;
 333         data.blocks = 1;
 334         data.flags = MMC_DATA_READ;
 335         data.sg = &sg;
 336         data.sg_len = 1;
 337
 338         sg_init_one(&sg, resp, 64);
 339
 340         mmc_set_data_timeout(&data, card);
 341
 342         mmc_wait_for_req(card->host, &mrq);
 343
 344         if (cmd.error)
 345                 return cmd.error;
 346         if (data.error)
 347                 return data.error;
 348
 349         return 0;
 350 }
 351