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 struct mmc_command cmd = {0}; 124 125 BUG_ON(!card); 126 BUG_ON(!card->host); 127 128 cmd.opcode = SD_APP_SET_BUS_WIDTH; 129 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 130 131 switch (width) { 132 case MMC_BUS_WIDTH_1: 133 cmd.arg = SD_BUS_WIDTH_1; 134 break; 135 case MMC_BUS_WIDTH_4: 136 cmd.arg = SD_BUS_WIDTH_4; 137 break; 138 default: 139 return -EINVAL; 140 } 141 142 return mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES); 143 } 144 145 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 146 { 147 struct mmc_command cmd = {0}; 148 int i, err = 0; 149 150 BUG_ON(!host); 151 152 cmd.opcode = SD_APP_OP_COND; 153 if (mmc_host_is_spi(host)) 154 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */ 155 else 156 cmd.arg = ocr; 157 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; 158 159 for (i = 100; i; i--) { 160 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES); 161 if (err) 162 break; 163 164 /* if we're just probing, do a single pass */ 165 if (ocr == 0) 166 break; 167 168 /* otherwise wait until reset completes */ 169 if (mmc_host_is_spi(host)) { 170 if (!(cmd.resp[0] & R1_SPI_IDLE)) 171 break; 172 } else { 173 if (cmd.resp[0] & MMC_CARD_BUSY) 174 break; 175 } 176 177 err = -ETIMEDOUT; 178 179 mmc_delay(10); 180 } 181 182 if (!i) 183 pr_err("%s: card never left busy state\n", mmc_hostname(host)); 184 185 if (rocr && !mmc_host_is_spi(host)) 186 *rocr = cmd.resp[0]; 187 188 return err; 189 } 190 191 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 192 { 193 struct mmc_command cmd = {0}; 194 int err; 195 static const u8 test_pattern = 0xAA; 196 u8 result_pattern; 197 198 /* 199 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 200 * before SD_APP_OP_COND. This command will harmlessly fail for 201 * SD 1.0 cards. 202 */ 203 cmd.opcode = SD_SEND_IF_COND; 204 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; 205 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 206 207 err = mmc_wait_for_cmd(host, &cmd, 0); 208 if (err) 209 return err; 210 211 if (mmc_host_is_spi(host)) 212 result_pattern = cmd.resp[1] & 0xFF; 213 else 214 result_pattern = cmd.resp[0] & 0xFF; 215 216 if (result_pattern != test_pattern) 217 return -EIO; 218 219 return 0; 220 } 221 222 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 223 { 224 int err; 225 struct mmc_command cmd = {0}; 226 227 BUG_ON(!host); 228 BUG_ON(!rca); 229 230 cmd.opcode = SD_SEND_RELATIVE_ADDR; 231 cmd.arg = 0; 232 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 233 234 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 235 if (err) 236 return err; 237 238 *rca = cmd.resp[0] >> 16; 239 240 return 0; 241 } 242 243 int mmc_app_send_scr(struct mmc_card *card, u32 *scr) 244 { 245 int err; 246 struct mmc_request mrq = {NULL}; 247 struct mmc_command cmd = {0}; 248 struct mmc_data data = {0}; 249 struct scatterlist sg; 250 void *data_buf; 251 252 BUG_ON(!card); 253 BUG_ON(!card->host); 254 BUG_ON(!scr); 255 256 /* NOTE: caller guarantees scr is heap-allocated */ 257 258 err = mmc_app_cmd(card->host, card); 259 if (err) 260 return err; 261 262 /* dma onto stack is unsafe/nonportable, but callers to this 263 * routine normally provide temporary on-stack buffers ... 264 */ 265 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL); 266 if (data_buf == NULL) 267 return -ENOMEM; 268 269 mrq.cmd = &cmd; 270 mrq.data = &data; 271 272 cmd.opcode = SD_APP_SEND_SCR; 273 cmd.arg = 0; 274 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 275 276 data.blksz = 8; 277 data.blocks = 1; 278 data.flags = MMC_DATA_READ; 279 data.sg = &sg; 280 data.sg_len = 1; 281 282 sg_init_one(&sg, data_buf, 8); 283 284 mmc_set_data_timeout(&data, card); 285 286 mmc_wait_for_req(card->host, &mrq); 287 288 memcpy(scr, data_buf, sizeof(card->raw_scr)); 289 kfree(data_buf); 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 = {NULL}; 306 struct mmc_command cmd = {0}; 307 struct mmc_data data = {0}; 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 mrq.cmd = &cmd; 319 mrq.data = &data; 320 321 cmd.opcode = SD_SWITCH; 322 cmd.arg = mode << 31 | 0x00FFFFFF; 323 cmd.arg &= ~(0xF << (group * 4)); 324 cmd.arg |= value << (group * 4); 325 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 326 327 data.blksz = 64; 328 data.blocks = 1; 329 data.flags = MMC_DATA_READ; 330 data.sg = &sg; 331 data.sg_len = 1; 332 333 sg_init_one(&sg, resp, 64); 334 335 mmc_set_data_timeout(&data, card); 336 337 mmc_wait_for_req(card->host, &mrq); 338 339 if (cmd.error) 340 return cmd.error; 341 if (data.error) 342 return data.error; 343 344 return 0; 345 } 346 347 int mmc_app_sd_status(struct mmc_card *card, void *ssr) 348 { 349 int err; 350 struct mmc_request mrq = {NULL}; 351 struct mmc_command cmd = {0}; 352 struct mmc_data data = {0}; 353 struct scatterlist sg; 354 355 BUG_ON(!card); 356 BUG_ON(!card->host); 357 BUG_ON(!ssr); 358 359 /* NOTE: caller guarantees ssr is heap-allocated */ 360 361 err = mmc_app_cmd(card->host, card); 362 if (err) 363 return err; 364 365 mrq.cmd = &cmd; 366 mrq.data = &data; 367 368 cmd.opcode = SD_APP_SD_STATUS; 369 cmd.arg = 0; 370 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC; 371 372 data.blksz = 64; 373 data.blocks = 1; 374 data.flags = MMC_DATA_READ; 375 data.sg = &sg; 376 data.sg_len = 1; 377 378 sg_init_one(&sg, ssr, 64); 379 380 mmc_set_data_timeout(&data, card); 381 382 mmc_wait_for_req(card->host, &mrq); 383 384 if (cmd.error) 385 return cmd.error; 386 if (data.error) 387 return data.error; 388 389 return 0; 390 } 391