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_R1 | MMC_CMD_AC;
  37         } else {
  38                 cmd.arg = 0;
  39                 cmd.flags = 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 (!(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                         continue;
  88
  89                 memset(&mrq, 0, sizeof(struct mmc_request));
  90
  91                 memset(cmd->resp, 0, sizeof(cmd->resp));
  92                 cmd->retries = 0;
  93
  94                 mrq.cmd = cmd;
  95                 cmd->data = NULL;
  96
  97                 mmc_wait_for_req(host, &mrq);
  98
  99                 err = cmd->error;
 100                 if (!cmd->error)
 101                         break;
 102         }
 103
 104         return err;
 105 }
 106
 107 EXPORT_SYMBOL(mmc_wait_for_app_cmd);
 108
 109 int mmc_app_set_bus_width(struct mmc_card *card, int width)
 110 {
 111         int err;
 112         struct mmc_command cmd;
 113
 114         BUG_ON(!card);
 115         BUG_ON(!card->host);
 116
 117         memset(&cmd, 0, sizeof(struct mmc_command));
 118
 119         cmd.opcode = SD_APP_SET_BUS_WIDTH;
 120         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 121
 122         switch (width) {
 123         case MMC_BUS_WIDTH_1:
 124                 cmd.arg = SD_BUS_WIDTH_1;
 125                 break;
 126         case MMC_BUS_WIDTH_4:
 127                 cmd.arg = SD_BUS_WIDTH_4;
 128                 break;
 129         default:
 130                 return -EINVAL;
 131         }
 132
 133         err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
 134         if (err)
 135                 return err;
 136
 137         return 0;
 138 }
 139
 140 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 141 {
 142         struct mmc_command cmd;
 143         int i, err = 0;
 144
 145         BUG_ON(!host);
 146
 147         memset(&cmd, 0, sizeof(struct mmc_command));
 148
 149         cmd.opcode = SD_APP_OP_COND;
 150         cmd.arg = ocr;
 151         cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
 152
 153         for (i = 100; i; i--) {
 154                 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
 155                 if (err)
 156                         break;
 157
 158                 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
 159                         break;
 160
 161                 err = -ETIMEDOUT;
 162
 163                 mmc_delay(10);
 164         }
 165
 166         if (rocr)
 167                 *rocr = cmd.resp[0];
 168
 169         return err;
 170 }
 171
 172 int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
 173 {
 174         struct mmc_command cmd;
 175         int err;
 176         static const u8 test_pattern = 0xAA;
 177
 178         /*
 179          * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
 180          * before SD_APP_OP_COND. This command will harmlessly fail for
 181          * SD 1.0 cards.
 182          */
 183         cmd.opcode = SD_SEND_IF_COND;
 184         cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
 185         cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
 186
 187         err = mmc_wait_for_cmd(host, &cmd, 0);
 188         if (err)
 189                 return err;
 190
 191         if ((cmd.resp[0] & 0xFF) != test_pattern)
 192                 return -EIO;
 193
 194         return 0;
 195 }
 196
 197 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
 198 {
 199         int err;
 200         struct mmc_command cmd;
 201
 202         BUG_ON(!host);
 203         BUG_ON(!rca);
 204
 205         memset(&cmd, 0, sizeof(struct mmc_command));
 206
 207         cmd.opcode = SD_SEND_RELATIVE_ADDR;
 208         cmd.arg = 0;
 209         cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
 210
 211         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 212         if (err)
 213                 return err;
 214
 215         *rca = cmd.resp[0] >> 16;
 216
 217         return 0;
 218 }
 219
 220 int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 221 {
 222         int err;
 223         struct mmc_request mrq;
 224         struct mmc_command cmd;
 225         struct mmc_data data;
 226         struct scatterlist sg;
 227
 228         BUG_ON(!card);
 229         BUG_ON(!card->host);
 230         BUG_ON(!scr);
 231
 232         err = mmc_app_cmd(card->host, card);
 233         if (err)
 234                 return err;
 235
 236         memset(&mrq, 0, sizeof(struct mmc_request));
 237         memset(&cmd, 0, sizeof(struct mmc_command));
 238         memset(&data, 0, sizeof(struct mmc_data));
 239
 240         mrq.cmd = &cmd;
 241         mrq.data = &data;
 242
 243         cmd.opcode = SD_APP_SEND_SCR;
 244         cmd.arg = 0;
 245         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
 246
 247         data.blksz = 8;
 248         data.blocks = 1;
 249         data.flags = MMC_DATA_READ;
 250         data.sg = &sg;
 251         data.sg_len = 1;
 252
 253         sg_init_one(&sg, scr, 8);
 254
 255         mmc_set_data_timeout(&data, card);
 256
 257         mmc_wait_for_req(card->host, &mrq);
 258
 259         if (cmd.error)
 260                 return cmd.error;
 261         if (data.error)
 262                 return data.error;
 263
 264         scr[0] = ntohl(scr[0]);
 265         scr[1] = ntohl(scr[1]);
 266
 267         return 0;
 268 }
 269
 270 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 271         u8 value, u8 *resp)
 272 {
 273         struct mmc_request mrq;
 274         struct mmc_command cmd;
 275         struct mmc_data data;
 276         struct scatterlist sg;
 277
 278         BUG_ON(!card);
 279         BUG_ON(!card->host);
 280
 281         mode = !!mode;
 282         value &= 0xF;
 283
 284         memset(&mrq, 0, sizeof(struct mmc_request));
 285         memset(&cmd, 0, sizeof(struct mmc_command));
 286         memset(&data, 0, sizeof(struct mmc_data));
 287
 288         mrq.cmd = &cmd;
 289         mrq.data = &data;
 290
 291         cmd.opcode = SD_SWITCH;
 292         cmd.arg = mode << 31 | 0x00FFFFFF;
 293         cmd.arg &= ~(0xF << (group * 4));
 294         cmd.arg |= value << (group * 4);
 295         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
 296
 297         data.blksz = 64;
 298         data.blocks = 1;
 299         data.flags = MMC_DATA_READ;
 300         data.sg = &sg;
 301         data.sg_len = 1;
 302
 303         sg_init_one(&sg, resp, 64);
 304
 305         mmc_set_data_timeout(&data, card);
 306
 307         mmc_wait_for_req(card->host, &mrq);
 308
 309         if (cmd.error)
 310                 return cmd.error;
 311         if (data.error)
 312                 return data.error;
 313
 314         return 0;
 315 }
 316