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 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_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 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 err = mmc_app_cmd(host, card); 84 if (err) { 85 /* no point in retrying; no APP commands allowed */ 86 if (mmc_host_is_spi(host)) { 87 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 88 break; 89 } 90 continue; 91 } 92 93 memset(&mrq, 0, sizeof(struct mmc_request)); 94 95 memset(cmd->resp, 0, sizeof(cmd->resp)); 96 cmd->retries = 0; 97 98 mrq.cmd = cmd; 99 cmd->data = NULL; 100 101 mmc_wait_for_req(host, &mrq); 102 103 err = cmd->error; 104 if (!cmd->error) 105 break; 106 107 /* no point in retrying illegal APP commands */ 108 if (mmc_host_is_spi(host)) { 109 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 110 break; 111 } 112 } 113 114 return err; 115 } 116 117 EXPORT_SYMBOL(mmc_wait_for_app_cmd); 118 119 int mmc_app_set_bus_width(struct mmc_card *card, int width) 120 { 121 int err; 122 struct mmc_command cmd; 123 124 BUG_ON(!card); 125 BUG_ON(!card->host); 126 127 memset(&cmd, 0, sizeof(struct mmc_command)); 128 129 cmd.opcode = SD_APP_SET_BUS_WIDTH; 130 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 131 132 switch (width) { 133 case MMC_BUS_WIDTH_1: 134 cmd.arg = SD_BUS_WIDTH_1; 135 break; 136 case MMC_BUS_WIDTH_4: 137 cmd.arg = SD_BUS_WIDTH_4; 138 break; 139 default: 140 return -EINVAL; 141 } 142 143 err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES); 144 if (err) 145 return err; 146 147 return 0; 148 } 149 150 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 151 { 152 struct mmc_command cmd; 153 int i, err = 0; 154 155 BUG_ON(!host); 156 157 memset(&cmd, 0, sizeof(struct mmc_command)); 158 159 cmd.opcode = SD_APP_OP_COND; 160 if (mmc_host_is_spi(host)) 161 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */ 162 else 163 cmd.arg = ocr; 164 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; 165 166 for (i = 100; i; i--) { 167 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES); 168 if (err) 169 break; 170 171 /* if we're just probing, do a single pass */ 172 if (ocr == 0) 173 break; 174 175 /* otherwise wait until reset completes */ 176 if (mmc_host_is_spi(host)) { 177 if (!(cmd.resp[0] & R1_SPI_IDLE)) 178 break; 179 } else { 180 if (cmd.resp[0] & MMC_CARD_BUSY) 181 break; 182 } 183 184 err = -ETIMEDOUT; 185 186 mmc_delay(10); 187 } 188 189 if (rocr && !mmc_host_is_spi(host)) 190 *rocr = cmd.resp[0]; 191 192 return err; 193 } 194 195 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 196 { 197 struct mmc_command cmd; 198 int err; 199 static const u8 test_pattern = 0xAA; 200 u8 result_pattern; 201 202 /* 203 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 204 * before SD_APP_OP_COND. This command will harmlessly fail for 205 * SD 1.0 cards. 206 */ 207 cmd.opcode = SD_SEND_IF_COND; 208 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; 209 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 210 211 err = mmc_wait_for_cmd(host, &cmd, 0); 212 if (err) 213 return err; 214 215 if (mmc_host_is_spi(host)) 216 result_pattern = cmd.resp[1] & 0xFF; 217 else 218 result_pattern = cmd.resp[0] & 0xFF; 219 220 if (result_pattern != test_pattern) 221 return -EIO; 222 223 return 0; 224 } 225 226 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 227 { 228 int err; 229 struct mmc_command cmd; 230 231 BUG_ON(!host); 232 BUG_ON(!rca); 233 234 memset(&cmd, 0, sizeof(struct mmc_command)); 235 236 cmd.opcode = SD_SEND_RELATIVE_ADDR; 237 cmd.arg = 0; 238 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 239 240 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 241 if (err) 242 return err; 243 244 *rca = cmd.resp[0] >> 16; 245 246 return 0; 247 } 248 249 int mmc_app_send_scr(struct mmc_card *card, u32 *scr) 250 { 251 int err; 252 struct mmc_request mrq; 253 struct mmc_command cmd; 254 struct mmc_data data; 255 struct scatterlist sg; 256 void *data_buf; 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 /* dma onto stack is unsafe/nonportable, but callers to this 269 * routine normally provide temporary on-stack buffers ... 270 */ 271 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL); 272 if (data_buf == NULL) 273 return -ENOMEM; 274 275 memset(&mrq, 0, sizeof(struct mmc_request)); 276 memset(&cmd, 0, sizeof(struct mmc_command)); 277 memset(&data, 0, sizeof(struct mmc_data)); 278 279 mrq.cmd = &cmd; 280 mrq.data = &data; 281 282 cmd.opcode = SD_APP_SEND_SCR; 283 cmd.arg = 0; 284 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 285 286 data.blksz = 8; 287 data.blocks = 1; 288 data.flags = MMC_DATA_READ; 289 data.sg = &sg; 290 data.sg_len = 1; 291 292 sg_init_one(&sg, data_buf, 8); 293 294 mmc_set_data_timeout(&data, card); 295 296 mmc_wait_for_req(card->host, &mrq); 297 298 memcpy(scr, data_buf, sizeof(card->raw_scr)); 299 kfree(data_buf); 300 301 if (cmd.error) 302 return cmd.error; 303 if (data.error) 304 return data.error; 305 306 scr[0] = be32_to_cpu(scr[0]); 307 scr[1] = be32_to_cpu(scr[1]); 308 309 return 0; 310 } 311 312 int mmc_sd_switch(struct mmc_card *card, int mode, int group, 313 u8 value, u8 *resp) 314 { 315 struct mmc_request mrq; 316 struct mmc_command cmd; 317 struct mmc_data data; 318 struct scatterlist sg; 319 320 BUG_ON(!card); 321 BUG_ON(!card->host); 322 323 /* NOTE: caller guarantees resp is heap-allocated */ 324 325 mode = !!mode; 326 value &= 0xF; 327 328 memset(&mrq, 0, sizeof(struct mmc_request)); 329 memset(&cmd, 0, sizeof(struct mmc_command)); 330 memset(&data, 0, sizeof(struct mmc_data)); 331 332 mrq.cmd = &cmd; 333 mrq.data = &data; 334 335 cmd.opcode = SD_SWITCH; 336 cmd.arg = mode << 31 | 0x00FFFFFF; 337 cmd.arg &= ~(0xF << (group * 4)); 338 cmd.arg |= value << (group * 4); 339 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 340 341 data.blksz = 64; 342 data.blocks = 1; 343 data.flags = MMC_DATA_READ; 344 data.sg = &sg; 345 data.sg_len = 1; 346 347 sg_init_one(&sg, resp, 64); 348 349 mmc_set_data_timeout(&data, card); 350 351 mmc_wait_for_req(card->host, &mrq); 352 353 if (cmd.error) 354 return cmd.error; 355 if (data.error) 356 return data.error; 357 358 return 0; 359 } 360 361 int mmc_app_sd_status(struct mmc_card *card, void *ssr) 362 { 363 int err; 364 struct mmc_request mrq; 365 struct mmc_command cmd; 366 struct mmc_data data; 367 struct scatterlist sg; 368 369 BUG_ON(!card); 370 BUG_ON(!card->host); 371 BUG_ON(!ssr); 372 373 /* NOTE: caller guarantees ssr is heap-allocated */ 374 375 err = mmc_app_cmd(card->host, card); 376 if (err) 377 return err; 378 379 memset(&mrq, 0, sizeof(struct mmc_request)); 380 memset(&cmd, 0, sizeof(struct mmc_command)); 381 memset(&data, 0, sizeof(struct mmc_data)); 382 383 mrq.cmd = &cmd; 384 mrq.data = &data; 385 386 cmd.opcode = SD_APP_SD_STATUS; 387 cmd.arg = 0; 388 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC; 389 390 data.blksz = 64; 391 data.blocks = 1; 392 data.flags = MMC_DATA_READ; 393 data.sg = &sg; 394 data.sg_len = 1; 395 396 sg_init_one(&sg, ssr, 64); 397 398 mmc_set_data_timeout(&data, card); 399 400 mmc_wait_for_req(card->host, &mrq); 401 402 if (cmd.error) 403 return cmd.error; 404 if (data.error) 405 return data.error; 406 407 return 0; 408 } 409