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/export.h> 15 #include <linux/scatterlist.h> 16 17 #include <linux/mmc/host.h> 18 #include <linux/mmc/card.h> 19 #include <linux/mmc/mmc.h> 20 #include <linux/mmc/sd.h> 21 22 #include "core.h" 23 #include "sd_ops.h" 24 25 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card) 26 { 27 int err; 28 struct mmc_command cmd = {0}; 29 30 BUG_ON(!host); 31 BUG_ON(card && (card->host != host)); 32 33 cmd.opcode = MMC_APP_CMD; 34 35 if (card) { 36 cmd.arg = card->rca << 16; 37 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; 38 } else { 39 cmd.arg = 0; 40 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR; 41 } 42 43 err = mmc_wait_for_cmd(host, &cmd, 0); 44 if (err) 45 return err; 46 47 /* Check that card supported application commands */ 48 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD)) 49 return -EOPNOTSUPP; 50 51 return 0; 52 } 53 EXPORT_SYMBOL_GPL(mmc_app_cmd); 54 55 /** 56 * mmc_wait_for_app_cmd - start an application command and wait for 57 completion 58 * @host: MMC host to start command 59 * @card: Card to send MMC_APP_CMD to 60 * @cmd: MMC command to start 61 * @retries: maximum number of retries 62 * 63 * Sends a MMC_APP_CMD, checks the card response, sends the command 64 * in the parameter and waits for it to complete. Return any error 65 * that occurred while the command was executing. Do not attempt to 66 * parse the response. 67 */ 68 int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card, 69 struct mmc_command *cmd, int retries) 70 { 71 struct mmc_request mrq = {NULL}; 72 73 int i, err; 74 75 BUG_ON(!cmd); 76 BUG_ON(retries < 0); 77 78 err = -EIO; 79 80 /* 81 * We have to resend MMC_APP_CMD for each attempt so 82 * we cannot use the retries field in mmc_command. 83 */ 84 for (i = 0;i <= retries;i++) { 85 err = mmc_app_cmd(host, card); 86 if (err) { 87 /* no point in retrying; no APP commands allowed */ 88 if (mmc_host_is_spi(host)) { 89 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 90 break; 91 } 92 continue; 93 } 94 95 memset(&mrq, 0, sizeof(struct mmc_request)); 96 97 memset(cmd->resp, 0, sizeof(cmd->resp)); 98 cmd->retries = 0; 99 100 mrq.cmd = cmd; 101 cmd->data = NULL; 102 103 mmc_wait_for_req(host, &mrq); 104 105 err = cmd->error; 106 if (!cmd->error) 107 break; 108 109 /* no point in retrying illegal APP commands */ 110 if (mmc_host_is_spi(host)) { 111 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 112 break; 113 } 114 } 115 116 return err; 117 } 118 119 EXPORT_SYMBOL(mmc_wait_for_app_cmd); 120 121 int mmc_app_set_bus_width(struct mmc_card *card, int width) 122 { 123 int err; 124 struct mmc_command cmd = {0}; 125 126 BUG_ON(!card); 127 BUG_ON(!card->host); 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 = {0}; 153 int i, err = 0; 154 155 BUG_ON(!host); 156 157 cmd.opcode = SD_APP_OP_COND; 158 if (mmc_host_is_spi(host)) 159 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */ 160 else 161 cmd.arg = ocr; 162 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; 163 164 for (i = 100; i; i--) { 165 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES); 166 if (err) 167 break; 168 169 /* if we're just probing, do a single pass */ 170 if (ocr == 0) 171 break; 172 173 /* otherwise wait until reset completes */ 174 if (mmc_host_is_spi(host)) { 175 if (!(cmd.resp[0] & R1_SPI_IDLE)) 176 break; 177 } else { 178 if (cmd.resp[0] & MMC_CARD_BUSY) 179 break; 180 } 181 182 err = -ETIMEDOUT; 183 184 mmc_delay(10); 185 } 186 187 if (rocr && !mmc_host_is_spi(host)) 188 *rocr = cmd.resp[0]; 189 190 return err; 191 } 192 193 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 194 { 195 struct mmc_command cmd = {0}; 196 int err; 197 static const u8 test_pattern = 0xAA; 198 u8 result_pattern; 199 200 /* 201 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 202 * before SD_APP_OP_COND. This command will harmlessly fail for 203 * SD 1.0 cards. 204 */ 205 cmd.opcode = SD_SEND_IF_COND; 206 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; 207 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 208 209 err = mmc_wait_for_cmd(host, &cmd, 0); 210 if (err) 211 return err; 212 213 if (mmc_host_is_spi(host)) 214 result_pattern = cmd.resp[1] & 0xFF; 215 else 216 result_pattern = cmd.resp[0] & 0xFF; 217 218 if (result_pattern != test_pattern) 219 return -EIO; 220 221 return 0; 222 } 223 224 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 225 { 226 int err; 227 struct mmc_command cmd = {0}; 228 229 BUG_ON(!host); 230 BUG_ON(!rca); 231 232 cmd.opcode = SD_SEND_RELATIVE_ADDR; 233 cmd.arg = 0; 234 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 235 236 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 237 if (err) 238 return err; 239 240 *rca = cmd.resp[0] >> 16; 241 242 return 0; 243 } 244 245 int mmc_app_send_scr(struct mmc_card *card, u32 *scr) 246 { 247 int err; 248 struct mmc_request mrq = {NULL}; 249 struct mmc_command cmd = {0}; 250 struct mmc_data data = {0}; 251 struct scatterlist sg; 252 void *data_buf; 253 254 BUG_ON(!card); 255 BUG_ON(!card->host); 256 BUG_ON(!scr); 257 258 /* NOTE: caller guarantees scr is heap-allocated */ 259 260 err = mmc_app_cmd(card->host, card); 261 if (err) 262 return err; 263 264 /* dma onto stack is unsafe/nonportable, but callers to this 265 * routine normally provide temporary on-stack buffers ... 266 */ 267 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL); 268 if (data_buf == NULL) 269 return -ENOMEM; 270 271 mrq.cmd = &cmd; 272 mrq.data = &data; 273 274 cmd.opcode = SD_APP_SEND_SCR; 275 cmd.arg = 0; 276 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 277 278 data.blksz = 8; 279 data.blocks = 1; 280 data.flags = MMC_DATA_READ; 281 data.sg = &sg; 282 data.sg_len = 1; 283 284 sg_init_one(&sg, data_buf, 8); 285 286 mmc_set_data_timeout(&data, card); 287 288 mmc_wait_for_req(card->host, &mrq); 289 290 memcpy(scr, data_buf, sizeof(card->raw_scr)); 291 kfree(data_buf); 292 293 if (cmd.error) 294 return cmd.error; 295 if (data.error) 296 return data.error; 297 298 scr[0] = be32_to_cpu(scr[0]); 299 scr[1] = be32_to_cpu(scr[1]); 300 301 return 0; 302 } 303 304 int mmc_sd_switch(struct mmc_card *card, int mode, int group, 305 u8 value, u8 *resp) 306 { 307 struct mmc_request mrq = {NULL}; 308 struct mmc_command cmd = {0}; 309 struct mmc_data data = {0}; 310 struct scatterlist sg; 311 312 BUG_ON(!card); 313 BUG_ON(!card->host); 314 315 /* NOTE: caller guarantees resp is heap-allocated */ 316 317 mode = !!mode; 318 value &= 0xF; 319 320 mrq.cmd = &cmd; 321 mrq.data = &data; 322 323 cmd.opcode = SD_SWITCH; 324 cmd.arg = mode << 31 | 0x00FFFFFF; 325 cmd.arg &= ~(0xF << (group * 4)); 326 cmd.arg |= value << (group * 4); 327 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 328 329 data.blksz = 64; 330 data.blocks = 1; 331 data.flags = MMC_DATA_READ; 332 data.sg = &sg; 333 data.sg_len = 1; 334 335 sg_init_one(&sg, resp, 64); 336 337 mmc_set_data_timeout(&data, card); 338 339 mmc_wait_for_req(card->host, &mrq); 340 341 if (cmd.error) 342 return cmd.error; 343 if (data.error) 344 return data.error; 345 346 return 0; 347 } 348 349 int mmc_app_sd_status(struct mmc_card *card, void *ssr) 350 { 351 int err; 352 struct mmc_request mrq = {NULL}; 353 struct mmc_command cmd = {0}; 354 struct mmc_data data = {0}; 355 struct scatterlist sg; 356 357 BUG_ON(!card); 358 BUG_ON(!card->host); 359 BUG_ON(!ssr); 360 361 /* NOTE: caller guarantees ssr is heap-allocated */ 362 363 err = mmc_app_cmd(card->host, card); 364 if (err) 365 return err; 366 367 mrq.cmd = &cmd; 368 mrq.data = &data; 369 370 cmd.opcode = SD_APP_SD_STATUS; 371 cmd.arg = 0; 372 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC; 373 374 data.blksz = 64; 375 data.blocks = 1; 376 data.flags = MMC_DATA_READ; 377 data.sg = &sg; 378 data.sg_len = 1; 379 380 sg_init_one(&sg, ssr, 64); 381 382 mmc_set_data_timeout(&data, card); 383 384 mmc_wait_for_req(card->host, &mrq); 385 386 if (cmd.error) 387 return cmd.error; 388 if (data.error) 389 return data.error; 390 391 return 0; 392 } 393