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 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
  25 {
  26         int err;
  27         struct mmc_command cmd = {0};
  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 EXPORT_SYMBOL_GPL(mmc_app_cmd);
  53
  54 /**
  55  *      mmc_wait_for_app_cmd - start an application command and wait for
  56                                completion
  57  *      @host: MMC host to start command
  58  *      @card: Card to send MMC_APP_CMD to
  59  *      @cmd: MMC command to start
  60  *      @retries: maximum number of retries
  61  *
  62  *      Sends a MMC_APP_CMD, checks the card response, sends the command
  63  *      in the parameter and waits for it to complete. Return any error
  64  *      that occurred while the command was executing.  Do not attempt to
  65  *      parse the response.
  66  */
  67 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
  68         struct mmc_command *cmd, int retries)
  69 {
  70         struct mmc_request mrq = {0};
  71
  72         int i, err;
  73
  74         BUG_ON(!cmd);
  75         BUG_ON(retries < 0);
  76
  77         err = -EIO;
  78
  79         /*
  80          * We have to resend MMC_APP_CMD for each attempt so
  81          * we cannot use the retries field in mmc_command.
  82          */
  83         for (i = 0;i <= retries;i++) {
  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 = {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         err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 143         if (err)
 144                 return err;
 145
 146         return 0;
 147 }
 148
 149 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 150 {
 151         struct mmc_command cmd = {0};
 152         int i, err = 0;
 153
 154         BUG_ON(!host);
 155
 156         cmd.opcode = SD_APP_OP_COND;
 157         if (mmc_host_is_spi(host))
 158                 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
 159         else
 160                 cmd.arg = ocr;
 161         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
 162
 163         for (i = 100; i; i--) {
 164                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 165                 if (err)
 166                         break;
 167
 168                 /* if we're just probing, do a single pass */
 169                 if (ocr == 0)
 170                         break;
 171
 172                 /* otherwise wait until reset completes */
 173                 if (mmc_host_is_spi(host)) {
 174                         if (!(cmd.resp[0] & R1_SPI_IDLE))
 175                                 break;
 176                 } else {
 177                         if (cmd.resp[0] & MMC_CARD_BUSY)
 178                                 break;
 179                 }
 180
 181                 err = -ETIMEDOUT;
 182
 183                 mmc_delay(10);
 184         }
 185
 186         if (rocr && !mmc_host_is_spi(host))
 187                 *rocr = cmd.resp[0];
 188
 189         return err;
 190 }
 191
 192 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 193 {
 194         struct mmc_command cmd = {0};
 195         int err;
 196         static const u8 test_pattern = 0xAA;
 197         u8 result_pattern;
 198
 199         /*
 200          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 201          * before SD_APP_OP_COND. This command will harmlessly fail for
 202          * SD 1.0 cards.
 203          */
 204         cmd.opcode = SD_SEND_IF_COND;
 205         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 206         cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
 207
 208         err = mmc_wait_for_cmd(host, &cmd, 0);
 209         if (err)
 210                 return err;
 211
 212         if (mmc_host_is_spi(host))
 213                 result_pattern = cmd.resp[1] & 0xFF;
 214         else
 215                 result_pattern = cmd.resp[0] & 0xFF;
 216
 217         if (result_pattern != test_pattern)
 218                 return -EIO;
 219
 220         return 0;
 221 }
 222
 223 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 224 {
 225         int err;
 226         struct mmc_command cmd = {0};
 227
 228         BUG_ON(!host);
 229         BUG_ON(!rca);
 230
 231         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 232         cmd.arg = 0;
 233         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 234
 235         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 236         if (err)
 237                 return err;
 238
 239         *rca = cmd.resp[0] >> 16;
 240
 241         return 0;
 242 }
 243
 244 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 245 {
 246         int err;
 247         struct mmc_request mrq = {0};
 248         struct mmc_command cmd = {0};
 249         struct mmc_data data = {0};
 250         struct scatterlist sg;
 251         void *data_buf;
 252
 253         BUG_ON(!card);
 254         BUG_ON(!card->host);
 255         BUG_ON(!scr);
 256
 257         /* NOTE: caller guarantees scr is heap-allocated */
 258
 259         err = mmc_app_cmd(card->host, card);
 260         if (err)
 261                 return err;
 262
 263         /* dma onto stack is unsafe/nonportable, but callers to this
 264          * routine normally provide temporary on-stack buffers ...
 265          */
 266         data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
 267         if (data_buf == NULL)
 268                 return -ENOMEM;
 269
 270         mrq.cmd = &cmd;
 271         mrq.data = &data;
 272
 273         cmd.opcode = SD_APP_SEND_SCR;
 274         cmd.arg = 0;
 275         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 276
 277         data.blksz = 8;
 278         data.blocks = 1;
 279         data.flags = MMC_DATA_READ;
 280         data.sg = &sg;
 281         data.sg_len = 1;
 282
 283         sg_init_one(&sg, data_buf, 8);
 284
 285         mmc_set_data_timeout(&data, card);
 286
 287         mmc_wait_for_req(card->host, &mrq);
 288
 289         memcpy(scr, data_buf, sizeof(card->raw_scr));
 290         kfree(data_buf);
 291
 292         if (cmd.error)
 293                 return cmd.error;
 294         if (data.error)
 295                 return data.error;
 296
 297         scr[0] = be32_to_cpu(scr[0]);
 298         scr[1] = be32_to_cpu(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 = {0};
 307         struct mmc_command cmd = {0};
 308         struct mmc_data data = {0};
 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         mrq.cmd = &cmd;
 320         mrq.data = &data;
 321
 322         cmd.opcode = SD_SWITCH;
 323         cmd.arg = mode << 31 | 0x00FFFFFF;
 324         cmd.arg &= ~(0xF << (group * 4));
 325         cmd.arg |= value << (group * 4);
 326         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 327
 328         data.blksz = 64;
 329         data.blocks = 1;
 330         data.flags = MMC_DATA_READ;
 331         data.sg = &sg;
 332         data.sg_len = 1;
 333
 334         sg_init_one(&sg, resp, 64);
 335
 336         mmc_set_data_timeout(&data, card);
 337
 338         mmc_wait_for_req(card->host, &mrq);
 339
 340         if (cmd.error)
 341                 return cmd.error;
 342         if (data.error)
 343                 return data.error;
 344
 345         return 0;
 346 }
 347
 348 int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 349 {
 350         int err;
 351         struct mmc_request mrq = {0};
 352         struct mmc_command cmd = {0};
 353         struct mmc_data data = {0};
 354         struct scatterlist sg;
 355
 356         BUG_ON(!card);
 357         BUG_ON(!card->host);
 358         BUG_ON(!ssr);
 359
 360         /* NOTE: caller guarantees ssr is heap-allocated */
 361
 362         err = mmc_app_cmd(card->host, card);
 363         if (err)
 364                 return err;
 365
 366         mrq.cmd = &cmd;
 367         mrq.data = &data;
 368
 369         cmd.opcode = SD_APP_SD_STATUS;
 370         cmd.arg = 0;
 371         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
 372
 373         data.blksz = 64;
 374         data.blocks = 1;
 375         data.flags = MMC_DATA_READ;
 376         data.sg = &sg;
 377         data.sg_len = 1;
 378
 379         sg_init_one(&sg, ssr, 64);
 380
 381         mmc_set_data_timeout(&data, card);
 382
 383         mmc_wait_for_req(card->host, &mrq);
 384
 385         if (cmd.error)
 386                 return cmd.error;
 387         if (data.error)
 388                 return data.error;
 389
 390         return 0;
 391 }