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 = {}; 29 30 if (WARN_ON(card && card->host != host)) 31 return -EINVAL; 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 = {}; 72 73 int i, err; 74 75 if (retries < 0) 76 retries = MMC_CMD_RETRIES; 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 = {}; 124 125 cmd.opcode = SD_APP_SET_BUS_WIDTH; 126 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 127 128 switch (width) { 129 case MMC_BUS_WIDTH_1: 130 cmd.arg = SD_BUS_WIDTH_1; 131 break; 132 case MMC_BUS_WIDTH_4: 133 cmd.arg = SD_BUS_WIDTH_4; 134 break; 135 default: 136 return -EINVAL; 137 } 138 139 return mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES); 140 } 141 142 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 143 { 144 struct mmc_command cmd = {}; 145 int i, err = 0; 146 147 cmd.opcode = SD_APP_OP_COND; 148 if (mmc_host_is_spi(host)) 149 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */ 150 else 151 cmd.arg = ocr; 152 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; 153 154 for (i = 100; i; i--) { 155 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES); 156 if (err) 157 break; 158 159 /* if we're just probing, do a single pass */ 160 if (ocr == 0) 161 break; 162 163 /* otherwise wait until reset completes */ 164 if (mmc_host_is_spi(host)) { 165 if (!(cmd.resp[0] & R1_SPI_IDLE)) 166 break; 167 } else { 168 if (cmd.resp[0] & MMC_CARD_BUSY) 169 break; 170 } 171 172 err = -ETIMEDOUT; 173 174 mmc_delay(10); 175 } 176 177 if (!i) 178 pr_err("%s: card never left busy state\n", mmc_hostname(host)); 179 180 if (rocr && !mmc_host_is_spi(host)) 181 *rocr = cmd.resp[0]; 182 183 return err; 184 } 185 186 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 187 { 188 struct mmc_command cmd = {}; 189 int err; 190 static const u8 test_pattern = 0xAA; 191 u8 result_pattern; 192 193 /* 194 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 195 * before SD_APP_OP_COND. This command will harmlessly fail for 196 * SD 1.0 cards. 197 */ 198 cmd.opcode = SD_SEND_IF_COND; 199 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; 200 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 201 202 err = mmc_wait_for_cmd(host, &cmd, 0); 203 if (err) 204 return err; 205 206 if (mmc_host_is_spi(host)) 207 result_pattern = cmd.resp[1] & 0xFF; 208 else 209 result_pattern = cmd.resp[0] & 0xFF; 210 211 if (result_pattern != test_pattern) 212 return -EIO; 213 214 return 0; 215 } 216 217 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 218 { 219 int err; 220 struct mmc_command cmd = {}; 221 222 cmd.opcode = SD_SEND_RELATIVE_ADDR; 223 cmd.arg = 0; 224 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 225 226 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 227 if (err) 228 return err; 229 230 *rca = cmd.resp[0] >> 16; 231 232 return 0; 233 } 234 235 int mmc_app_send_scr(struct mmc_card *card, u32 *scr) 236 { 237 int err; 238 struct mmc_request mrq = {}; 239 struct mmc_command cmd = {}; 240 struct mmc_data data = {}; 241 struct scatterlist sg; 242 void *data_buf; 243 244 /* NOTE: caller guarantees scr is heap-allocated */ 245 246 err = mmc_app_cmd(card->host, card); 247 if (err) 248 return err; 249 250 /* dma onto stack is unsafe/nonportable, but callers to this 251 * routine normally provide temporary on-stack buffers ... 252 */ 253 data_buf = kmalloc(sizeof(card->raw_scr), GFP_KERNEL); 254 if (data_buf == NULL) 255 return -ENOMEM; 256 257 mrq.cmd = &cmd; 258 mrq.data = &data; 259 260 cmd.opcode = SD_APP_SEND_SCR; 261 cmd.arg = 0; 262 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 263 264 data.blksz = 8; 265 data.blocks = 1; 266 data.flags = MMC_DATA_READ; 267 data.sg = &sg; 268 data.sg_len = 1; 269 270 sg_init_one(&sg, data_buf, 8); 271 272 mmc_set_data_timeout(&data, card); 273 274 mmc_wait_for_req(card->host, &mrq); 275 276 memcpy(scr, data_buf, sizeof(card->raw_scr)); 277 kfree(data_buf); 278 279 if (cmd.error) 280 return cmd.error; 281 if (data.error) 282 return data.error; 283 284 scr[0] = be32_to_cpu(scr[0]); 285 scr[1] = be32_to_cpu(scr[1]); 286 287 return 0; 288 } 289 290 int mmc_sd_switch(struct mmc_card *card, int mode, int group, 291 u8 value, u8 *resp) 292 { 293 struct mmc_request mrq = {}; 294 struct mmc_command cmd = {}; 295 struct mmc_data data = {}; 296 struct scatterlist sg; 297 298 /* NOTE: caller guarantees resp is heap-allocated */ 299 300 mode = !!mode; 301 value &= 0xF; 302 303 mrq.cmd = &cmd; 304 mrq.data = &data; 305 306 cmd.opcode = SD_SWITCH; 307 cmd.arg = mode << 31 | 0x00FFFFFF; 308 cmd.arg &= ~(0xF << (group * 4)); 309 cmd.arg |= value << (group * 4); 310 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 311 312 data.blksz = 64; 313 data.blocks = 1; 314 data.flags = MMC_DATA_READ; 315 data.sg = &sg; 316 data.sg_len = 1; 317 318 sg_init_one(&sg, resp, 64); 319 320 mmc_set_data_timeout(&data, card); 321 322 mmc_wait_for_req(card->host, &mrq); 323 324 if (cmd.error) 325 return cmd.error; 326 if (data.error) 327 return data.error; 328 329 return 0; 330 } 331 332 int mmc_app_sd_status(struct mmc_card *card, void *ssr) 333 { 334 int err; 335 struct mmc_request mrq = {}; 336 struct mmc_command cmd = {}; 337 struct mmc_data data = {}; 338 struct scatterlist sg; 339 340 /* NOTE: caller guarantees ssr is heap-allocated */ 341 342 err = mmc_app_cmd(card->host, card); 343 if (err) 344 return err; 345 346 mrq.cmd = &cmd; 347 mrq.data = &data; 348 349 cmd.opcode = SD_APP_SD_STATUS; 350 cmd.arg = 0; 351 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC; 352 353 data.blksz = 64; 354 data.blocks = 1; 355 data.flags = MMC_DATA_READ; 356 data.sg = &sg; 357 data.sg_len = 1; 358 359 sg_init_one(&sg, ssr, 64); 360 361 mmc_set_data_timeout(&data, card); 362 363 mmc_wait_for_req(card->host, &mrq); 364 365 if (cmd.error) 366 return cmd.error; 367 if (data.error) 368 return data.error; 369 370 return 0; 371 } 372