1 /* 2 * linux/drivers/mmc/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 /** 25 * mmc_wait_for_app_cmd - start an application command and wait for 26 completion 27 * @host: MMC host to start command 28 * @rca: RCA to send MMC_APP_CMD to 29 * @cmd: MMC command to start 30 * @retries: maximum number of retries 31 * 32 * Sends a MMC_APP_CMD, checks the card response, sends the command 33 * in the parameter and waits for it to complete. Return any error 34 * that occurred while the command was executing. Do not attempt to 35 * parse the response. 36 */ 37 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card, 38 struct mmc_command *cmd, int retries) 39 { 40 struct mmc_request mrq; 41 42 int i, err; 43 44 BUG_ON(!cmd); 45 BUG_ON(retries < 0); 46 47 err = MMC_ERR_INVALID; 48 49 /* 50 * We have to resend MMC_APP_CMD for each attempt so 51 * we cannot use the retries field in mmc_command. 52 */ 53 for (i = 0;i <= retries;i++) { 54 memset(&mrq, 0, sizeof(struct mmc_request)); 55 56 err = mmc_app_cmd(host, card); 57 if (err != MMC_ERR_NONE) 58 continue; 59 60 memset(&mrq, 0, sizeof(struct mmc_request)); 61 62 memset(cmd->resp, 0, sizeof(cmd->resp)); 63 cmd->retries = 0; 64 65 mrq.cmd = cmd; 66 cmd->data = NULL; 67 68 mmc_wait_for_req(host, &mrq); 69 70 err = cmd->error; 71 if (cmd->error == MMC_ERR_NONE) 72 break; 73 } 74 75 return err; 76 } 77 78 EXPORT_SYMBOL(mmc_wait_for_app_cmd); 79 80 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card) 81 { 82 int err; 83 struct mmc_command cmd; 84 85 BUG_ON(!host); 86 BUG_ON(card && (card->host != host)); 87 88 cmd.opcode = MMC_APP_CMD; 89 90 if (card) { 91 cmd.arg = card->rca << 16; 92 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 93 } else { 94 cmd.arg = 0; 95 cmd.flags = MMC_RSP_R1 | MMC_CMD_BCR; 96 } 97 98 err = mmc_wait_for_cmd(host, &cmd, 0); 99 if (err != MMC_ERR_NONE) 100 return err; 101 102 /* Check that card supported application commands */ 103 if (!(cmd.resp[0] & R1_APP_CMD)) 104 return MMC_ERR_FAILED; 105 106 return MMC_ERR_NONE; 107 } 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 MMC_ERR_INVALID; 131 } 132 133 err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES); 134 if (err != MMC_ERR_NONE) 135 return err; 136 137 return MMC_ERR_NONE; 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 != MMC_ERR_NONE) 156 break; 157 158 if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0) 159 break; 160 161 err = MMC_ERR_TIMEOUT; 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 != MMC_ERR_NONE) 189 return err; 190 191 if ((cmd.resp[0] & 0xFF) != test_pattern) 192 return MMC_ERR_FAILED; 193 194 return MMC_ERR_NONE; 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 != MMC_ERR_NONE) 213 return err; 214 215 *rca = cmd.resp[0] >> 16; 216 217 return MMC_ERR_NONE; 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 != MMC_ERR_NONE) 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, 0); 256 257 mmc_wait_for_req(card->host, &mrq); 258 259 if (cmd.error != MMC_ERR_NONE) 260 return cmd.error; 261 if (data.error != MMC_ERR_NONE) 262 return data.error; 263 264 scr[0] = ntohl(scr[0]); 265 scr[1] = ntohl(scr[1]); 266 267 return MMC_ERR_NONE; 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, 0); 306 307 mmc_wait_for_req(card->host, &mrq); 308 309 if (cmd.error != MMC_ERR_NONE) 310 return cmd.error; 311 if (data.error != MMC_ERR_NONE) 312 return data.error; 313 314 return MMC_ERR_NONE; 315 } 316 317