drivers/mmc/core/mmc_ops.c

   1 /*
   2  *  linux/drivers/mmc/core/mmc_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
  20 #include "core.h"
  21 #include "mmc_ops.h"
  22
  23 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
  24 {
  25         int err;
  26         struct mmc_command cmd;
  27
  28         BUG_ON(!host);
  29
  30         memset(&cmd, 0, sizeof(struct mmc_command));
  31
  32         cmd.opcode = MMC_SELECT_CARD;
  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_NONE | MMC_CMD_AC;
  40         }
  41
  42         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
  43         if (err != MMC_ERR_NONE)
  44                 return err;
  45
  46         return MMC_ERR_NONE;
  47 }
  48
  49 int mmc_select_card(struct mmc_card *card)
  50 {
  51         BUG_ON(!card);
  52
  53         return _mmc_select_card(card->host, card);
  54 }
  55
  56 int mmc_deselect_cards(struct mmc_host *host)
  57 {
  58         return _mmc_select_card(host, NULL);
  59 }
  60
  61 int mmc_go_idle(struct mmc_host *host)
  62 {
  63         int err;
  64         struct mmc_command cmd;
  65
  66         mmc_set_chip_select(host, MMC_CS_HIGH);
  67
  68         mmc_delay(1);
  69
  70         memset(&cmd, 0, sizeof(struct mmc_command));
  71
  72         cmd.opcode = MMC_GO_IDLE_STATE;
  73         cmd.arg = 0;
  74         cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
  75
  76         err = mmc_wait_for_cmd(host, &cmd, 0);
  77
  78         mmc_delay(1);
  79
  80         mmc_set_chip_select(host, MMC_CS_DONTCARE);
  81
  82         mmc_delay(1);
  83
  84         return err;
  85 }
  86
  87 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
  88 {
  89         struct mmc_command cmd;
  90         int i, err = 0;
  91
  92         BUG_ON(!host);
  93
  94         memset(&cmd, 0, sizeof(struct mmc_command));
  95
  96         cmd.opcode = MMC_SEND_OP_COND;
  97         cmd.arg = ocr;
  98         cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
  99
 100         for (i = 100; i; i--) {
 101                 err = mmc_wait_for_cmd(host, &cmd, 0);
 102                 if (err != MMC_ERR_NONE)
 103                         break;
 104
 105                 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
 106                         break;
 107
 108                 err = MMC_ERR_TIMEOUT;
 109
 110                 mmc_delay(10);
 111         }
 112
 113         if (rocr)
 114                 *rocr = cmd.resp[0];
 115
 116         return err;
 117 }
 118
 119 int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
 120 {
 121         int err;
 122         struct mmc_command cmd;
 123
 124         BUG_ON(!host);
 125         BUG_ON(!cid);
 126
 127         memset(&cmd, 0, sizeof(struct mmc_command));
 128
 129         cmd.opcode = MMC_ALL_SEND_CID;
 130         cmd.arg = 0;
 131         cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
 132
 133         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 134         if (err != MMC_ERR_NONE)
 135                 return err;
 136
 137         memcpy(cid, cmd.resp, sizeof(u32) * 4);
 138
 139         return MMC_ERR_NONE;
 140 }
 141
 142 int mmc_set_relative_addr(struct mmc_card *card)
 143 {
 144         int err;
 145         struct mmc_command cmd;
 146
 147         BUG_ON(!card);
 148         BUG_ON(!card->host);
 149
 150         memset(&cmd, 0, sizeof(struct mmc_command));
 151
 152         cmd.opcode = MMC_SET_RELATIVE_ADDR;
 153         cmd.arg = card->rca << 16;
 154         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 155
 156         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 157         if (err != MMC_ERR_NONE)
 158                 return err;
 159
 160         return MMC_ERR_NONE;
 161 }
 162
 163 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 164 {
 165         int err;
 166         struct mmc_command cmd;
 167
 168         BUG_ON(!card);
 169         BUG_ON(!card->host);
 170         BUG_ON(!csd);
 171
 172         memset(&cmd, 0, sizeof(struct mmc_command));
 173
 174         cmd.opcode = MMC_SEND_CSD;
 175         cmd.arg = card->rca << 16;
 176         cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
 177
 178         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 179         if (err != MMC_ERR_NONE)
 180                 return err;
 181
 182         memcpy(csd, cmd.resp, sizeof(u32) * 4);
 183
 184         return MMC_ERR_NONE;
 185 }
 186
 187 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
 188 {
 189         struct mmc_request mrq;
 190         struct mmc_command cmd;
 191         struct mmc_data data;
 192         struct scatterlist sg;
 193
 194         BUG_ON(!card);
 195         BUG_ON(!card->host);
 196         BUG_ON(!ext_csd);
 197
 198         memset(&mrq, 0, sizeof(struct mmc_request));
 199         memset(&cmd, 0, sizeof(struct mmc_command));
 200         memset(&data, 0, sizeof(struct mmc_data));
 201
 202         mrq.cmd = &cmd;
 203         mrq.data = &data;
 204
 205         cmd.opcode = MMC_SEND_EXT_CSD;
 206         cmd.arg = 0;
 207         cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
 208
 209         data.blksz = 512;
 210         data.blocks = 1;
 211         data.flags = MMC_DATA_READ;
 212         data.sg = &sg;
 213         data.sg_len = 1;
 214
 215         sg_init_one(&sg, ext_csd, 512);
 216
 217         mmc_set_data_timeout(&data, card, 0);
 218
 219         mmc_wait_for_req(card->host, &mrq);
 220
 221         if (cmd.error != MMC_ERR_NONE)
 222                 return cmd.error;
 223         if (data.error != MMC_ERR_NONE)
 224                 return data.error;
 225
 226         return MMC_ERR_NONE;
 227 }
 228
 229 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
 230 {
 231         int err;
 232         struct mmc_command cmd;
 233
 234         BUG_ON(!card);
 235         BUG_ON(!card->host);
 236
 237         memset(&cmd, 0, sizeof(struct mmc_command));
 238
 239         cmd.opcode = MMC_SWITCH;
 240         cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
 241                   (index << 16) |
 242                   (value << 8) |
 243                   set;
 244         cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
 245
 246         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 247         if (err != MMC_ERR_NONE)
 248                 return err;
 249
 250         return MMC_ERR_NONE;
 251 }
 252
 253 int mmc_send_status(struct mmc_card *card, u32 *status)
 254 {
 255         int err;
 256         struct mmc_command cmd;
 257
 258         BUG_ON(!card);
 259         BUG_ON(!card->host);
 260
 261         memset(&cmd, 0, sizeof(struct mmc_command));
 262
 263         cmd.opcode = MMC_SEND_STATUS;
 264         cmd.arg = card->rca << 16;
 265         cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 266
 267         err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
 268         if (err != MMC_ERR_NONE)
 269                 return err;
 270
 271         if (status)
 272                 *status = cmd.resp[0];
 273
 274         return MMC_ERR_NONE;
 275 }
 276