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 } 350 351