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 <linux/scatterlist.h>
  14
  15 #include <linux/mmc/host.h>
  16 #include <linux/mmc/card.h>
  17 #include <linux/mmc/mmc.h>
  18 #include <linux/mmc/sd.h>
  19
  20 #include "core.h"
  21 #include "sd_ops.h"
  22
  23 static int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
  24 {
  25         int err;
  26         struct mmc_command cmd;
  27
  28         BUG_ON(!host);
  29         BUG_ON(card && (card->host != host));
  30
  31         cmd.opcode = MMC_APP_CMD;
  32
  33         if (card) {
  34                 cmd.arg = card->rca << 16;
  35                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
  36         } else {
  37                 cmd.arg = 0;
  38                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
  39         }
  40
  41         err = mmc_wait_for_cmd(host, &cmd, 0);
  42         if (err)
  43                 return err;
  44
  45         /* Check that card supported application commands */
  46         if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
  47                 return -EOPNOTSUPP;
  48
  49         return 0;
  50 }
  51
  52 /**
  53  *      mmc_wait_for_app_cmd - start an application command and wait for
  54                                completion
  55  *      @host: MMC host to start command
  56  *      @card: Card to send MMC_APP_CMD to
  57  *      @cmd: MMC command to start
  58  *      @retries: maximum number of retries
  59  *
  60  *      Sends a MMC_APP_CMD, checks the card response, sends the command
  61  *      in the parameter and waits for it to complete. Return any error
  62  *      that occurred while the command was executing.  Do not attempt to
  63  *      parse the response.
  64  */
  65 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
  66         struct mmc_command *cmd, int retries)
  67 {
  68         struct mmc_request mrq;
  69
  70         int i, err;
  71
  72         BUG_ON(!cmd);
  73         BUG_ON(retries < 0);
  74
  75         err = -EIO;
  76
  77         /*
  78          * We have to resend MMC_APP_CMD for each attempt so
  79          * we cannot use the retries field in mmc_command.
  80          */
  81         for (i = 0;i <= retries;i++) {
  82                 memset(&mrq, 0, sizeof(struct mmc_request));
  83
  84                 err = mmc_app_cmd(host, card);
  85                 if (err) {
  86                         /* no point in retrying; no APP commands allowed */
  87                         if (mmc_host_is_spi(host)) {
  88                                 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
  89                                         break;
  90                         }
  91                         continue;
  92                 }
  93
  94                 memset(&mrq, 0, sizeof(struct mmc_request));
  95
  96                 memset(cmd->resp, 0, sizeof(cmd->resp));
  97                 cmd->retries = 0;
  98
  99                 mrq.cmd = cmd;
 100                 cmd->data = NULL;
 101
 102                 mmc_wait_for_req(host, &mrq);
 103
 104                 err = cmd->error;
 105                 if (!cmd->error)
 106                         break;
 107
 108                 /* no point in retrying illegal APP commands */
 109                 if (mmc_host_is_spi(host)) {
 110                         if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
 111                                 break;
 112                 }
 113         }
 114
 115         return err;
 116 }
 117
 118 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
 119
 120 int mmc_app_set_bus_width(struct mmc_card *card, int width)
 121 {
 122         int err;
 123         struct mmc_command cmd;
 124
 125         BUG_ON(!card);
 126         BUG_ON(!card->host);
 127
 128         memset(&cmd, 0, sizeof(struct mmc_command));
 129
 130         cmd.opcode = SD_APP_SET_BUS_WIDTH;
 131         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 132
 133         switch (width) {
 134         case MMC_BUS_WIDTH_1:
 135                 cmd.arg = SD_BUS_WIDTH_1;
 136                 break;
 137         case MMC_BUS_WIDTH_4:
 138                 cmd.arg = SD_BUS_WIDTH_4;
 139                 break;
 140         default:
 141                 return -EINVAL;
 142         }
 143
 144         err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 145         if (err)
 146                 return err;
 147
 148         return 0;
 149 }
 150
 151 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 152 {
 153         struct mmc_command cmd;
 154         int i, err = 0;
 155
 156         BUG_ON(!host);
 157
 158         memset(&cmd, 0, sizeof(struct mmc_command));
 159
 160         cmd.opcode = SD_APP_OP_COND;
 161         if (mmc_host_is_spi(host))
 162                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 163         else
 164                 cmd.arg = ocr;
 165         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 166
 167         for (i = 100; i; i--) {
 168                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 169                 if (err)
 170                         break;
 171
 172                 /* if we're just probing, do a single pass */
 173                 if (ocr == 0)
 174                         break;
 175
 176                 /* otherwise wait until reset completes */
 177                 if (mmc_host_is_spi(host)) {
 178                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 179                                 break;
 180                 } else {
 181                         if (cmd.resp[0] & MMC_CARD_BUSY)
 182                                 break;
 183                 }
 184
 185                 err = -ETIMEDOUT;
 186
 187                 mmc_delay(10);
 188         }
 189
 190         if (rocr && !mmc_host_is_spi(host))
 191                 *rocr = cmd.resp[0];
 192
 193         return err;
 194 }
 195
 196 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 197 {
 198         struct mmc_command cmd;
 199         int err;
 200         static const u8 test_pattern = 0xAA;
 201         u8 result_pattern;
 202
 203         /*
 204          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 205          * before SD_APP_OP_COND. This command will harmlessly fail for
 206          * SD 1.0 cards.
 207          */
 208         cmd.opcode = SD_SEND_IF_COND;
 209         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 210         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 211
 212         err = mmc_wait_for_cmd(host, &cmd, 0);
 213         if (err)
 214                 return err;
 215
 216         if (mmc_host_is_spi(host))
 217                 result_pattern = cmd.resp[1] & 0xFF;
 218         else
 219                 result_pattern = cmd.resp[0] & 0xFF;
 220
 221         if (result_pattern != test_pattern)
 222                 return -EIO;
 223
 224         return 0;
 225 }
 226
 227 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 228 {
 229         int err;
 230         struct mmc_command cmd;
 231
 232         BUG_ON(!host);
 233         BUG_ON(!rca);
 234
 235         memset(&cmd, 0, sizeof(struct mmc_command));
 236
 237         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 238         cmd.arg = 0;
 239         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 240
 241         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 242         if (err)
 243                 return err;
 244
 245         *rca = cmd.resp[0] >> 16;
 246
 247         return 0;
 248 }
 249
 250 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 251 {
 252         int err;
 253         struct mmc_request mrq;
 254         struct mmc_command cmd;
 255         struct mmc_data data;
 256         struct scatterlist sg;
 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         memset(&mrq, 0, sizeof(struct mmc_request));
 269         memset(&cmd, 0, sizeof(struct mmc_command));
 270         memset(&data, 0, sizeof(struct mmc_data));
 271
 272         mrq.cmd = &cmd;
 273         mrq.data = &data;
 274
 275         cmd.opcode = SD_APP_SEND_SCR;
 276         cmd.arg = 0;
 277         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 278
 279         data.blksz = 8;
 280         data.blocks = 1;
 281         data.flags = MMC_DATA_READ;
 282         data.sg = &sg;
 283         data.sg_len = 1;
 284
 285         sg_init_one(&sg, scr, 8);
 286
 287         mmc_set_data_timeout(&data, card);
 288
 289         mmc_wait_for_req(card->host, &mrq);
 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;
 306         struct mmc_command cmd;
 307         struct mmc_data data;
 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         memset(&mrq, 0, sizeof(struct mmc_request));
 319         memset(&cmd, 0, sizeof(struct mmc_command));
 320         memset(&data, 0, sizeof(struct mmc_data));
 321
 322         mrq.cmd = &cmd;
 323         mrq.data = &data;
 324
 325         cmd.opcode = SD_SWITCH;
 326         cmd.arg = mode << 31 | 0x00FFFFFF;
 327         cmd.arg &= ~(0xF << (group * 4));
 328         cmd.arg |= value << (group * 4);
 329         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 330
 331         data.blksz = 64;
 332         data.blocks = 1;
 333         data.flags = MMC_DATA_READ;
 334         data.sg = &sg;
 335         data.sg_len = 1;
 336
 337         sg_init_one(&sg, resp, 64);
 338
 339         mmc_set_data_timeout(&data, card);
 340
 341         mmc_wait_for_req(card->host, &mrq);
 342
 343         if (cmd.error)
 344                 return cmd.error;
 345         if (data.error)
 346                 return data.error;
 347
 348         return 0;
 349 }
 350