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 static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card, 56 struct mmc_command *cmd) 57 { 58 struct mmc_request mrq = {}; 59 int i, err = -EIO; 60 61 /* 62 * We have to resend MMC_APP_CMD for each attempt so 63 * we cannot use the retries field in mmc_command. 64 */ 65 for (i = 0; i <= MMC_CMD_RETRIES; i++) { 66 err = mmc_app_cmd(host, card); 67 if (err) { 68 /* no point in retrying; no APP commands allowed */ 69 if (mmc_host_is_spi(host)) { 70 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 71 break; 72 } 73 continue; 74 } 75 76 memset(&mrq, 0, sizeof(struct mmc_request)); 77 78 memset(cmd->resp, 0, sizeof(cmd->resp)); 79 cmd->retries = 0; 80 81 mrq.cmd = cmd; 82 cmd->data = NULL; 83 84 mmc_wait_for_req(host, &mrq); 85 86 err = cmd->error; 87 if (!cmd->error) 88 break; 89 90 /* no point in retrying illegal APP commands */ 91 if (mmc_host_is_spi(host)) { 92 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 93 break; 94 } 95 } 96 97 return err; 98 } 99 100 int mmc_app_set_bus_width(struct mmc_card *card, int width) 101 { 102 struct mmc_command cmd = {}; 103 104 cmd.opcode = SD_APP_SET_BUS_WIDTH; 105 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 106 107 switch (width) { 108 case MMC_BUS_WIDTH_1: 109 cmd.arg = SD_BUS_WIDTH_1; 110 break; 111 case MMC_BUS_WIDTH_4: 112 cmd.arg = SD_BUS_WIDTH_4; 113 break; 114 default: 115 return -EINVAL; 116 } 117 118 return mmc_wait_for_app_cmd(card->host, card, &cmd); 119 } 120 121 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 122 { 123 struct mmc_command cmd = {}; 124 int i, err = 0; 125 126 cmd.opcode = SD_APP_OP_COND; 127 if (mmc_host_is_spi(host)) 128 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */ 129 else 130 cmd.arg = ocr; 131 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; 132 133 for (i = 100; i; i--) { 134 err = mmc_wait_for_app_cmd(host, NULL, &cmd); 135 if (err) 136 break; 137 138 /* if we're just probing, do a single pass */ 139 if (ocr == 0) 140 break; 141 142 /* otherwise wait until reset completes */ 143 if (mmc_host_is_spi(host)) { 144 if (!(cmd.resp[0] & R1_SPI_IDLE)) 145 break; 146 } else { 147 if (cmd.resp[0] & MMC_CARD_BUSY) 148 break; 149 } 150 151 err = -ETIMEDOUT; 152 153 mmc_delay(10); 154 } 155 156 if (!i) 157 pr_err("%s: card never left busy state\n", mmc_hostname(host)); 158 159 if (rocr && !mmc_host_is_spi(host)) 160 *rocr = cmd.resp[0]; 161 162 return err; 163 } 164 165 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 166 { 167 struct mmc_command cmd = {}; 168 int err; 169 static const u8 test_pattern = 0xAA; 170 u8 result_pattern; 171 172 /* 173 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 174 * before SD_APP_OP_COND. This command will harmlessly fail for 175 * SD 1.0 cards. 176 */ 177 cmd.opcode = SD_SEND_IF_COND; 178 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; 179 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 180 181 err = mmc_wait_for_cmd(host, &cmd, 0); 182 if (err) 183 return err; 184 185 if (mmc_host_is_spi(host)) 186 result_pattern = cmd.resp[1] & 0xFF; 187 else 188 result_pattern = cmd.resp[0] & 0xFF; 189 190 if (result_pattern != test_pattern) 191 return -EIO; 192 193 return 0; 194 } 195 196 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 197 { 198 int err; 199 struct mmc_command cmd = {}; 200 201 cmd.opcode = SD_SEND_RELATIVE_ADDR; 202 cmd.arg = 0; 203 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 204 205 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 206 if (err) 207 return err; 208 209 *rca = cmd.resp[0] >> 16; 210 211 return 0; 212 } 213 214 int mmc_app_send_scr(struct mmc_card *card) 215 { 216 int err; 217 struct mmc_request mrq = {}; 218 struct mmc_command cmd = {}; 219 struct mmc_data data = {}; 220 struct scatterlist sg; 221 __be32 *scr; 222 223 /* NOTE: caller guarantees scr is heap-allocated */ 224 225 err = mmc_app_cmd(card->host, card); 226 if (err) 227 return err; 228 229 /* dma onto stack is unsafe/nonportable, but callers to this 230 * routine normally provide temporary on-stack buffers ... 231 */ 232 scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL); 233 if (!scr) 234 return -ENOMEM; 235 236 mrq.cmd = &cmd; 237 mrq.data = &data; 238 239 cmd.opcode = SD_APP_SEND_SCR; 240 cmd.arg = 0; 241 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 242 243 data.blksz = 8; 244 data.blocks = 1; 245 data.flags = MMC_DATA_READ; 246 data.sg = &sg; 247 data.sg_len = 1; 248 249 sg_init_one(&sg, scr, 8); 250 251 mmc_set_data_timeout(&data, card); 252 253 mmc_wait_for_req(card->host, &mrq); 254 255 card->raw_scr[0] = be32_to_cpu(scr[0]); 256 card->raw_scr[1] = be32_to_cpu(scr[1]); 257 258 kfree(scr); 259 260 if (cmd.error) 261 return cmd.error; 262 if (data.error) 263 return data.error; 264 265 return 0; 266 } 267 268 int mmc_sd_switch(struct mmc_card *card, int mode, int group, 269 u8 value, u8 *resp) 270 { 271 struct mmc_request mrq = {}; 272 struct mmc_command cmd = {}; 273 struct mmc_data data = {}; 274 struct scatterlist sg; 275 276 /* NOTE: caller guarantees resp is heap-allocated */ 277 278 mode = !!mode; 279 value &= 0xF; 280 281 mrq.cmd = &cmd; 282 mrq.data = &data; 283 284 cmd.opcode = SD_SWITCH; 285 cmd.arg = mode << 31 | 0x00FFFFFF; 286 cmd.arg &= ~(0xF << (group * 4)); 287 cmd.arg |= value << (group * 4); 288 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 289 290 data.blksz = 64; 291 data.blocks = 1; 292 data.flags = MMC_DATA_READ; 293 data.sg = &sg; 294 data.sg_len = 1; 295 296 sg_init_one(&sg, resp, 64); 297 298 mmc_set_data_timeout(&data, card); 299 300 mmc_wait_for_req(card->host, &mrq); 301 302 if (cmd.error) 303 return cmd.error; 304 if (data.error) 305 return data.error; 306 307 return 0; 308 } 309 310 int mmc_app_sd_status(struct mmc_card *card, void *ssr) 311 { 312 int err; 313 struct mmc_request mrq = {}; 314 struct mmc_command cmd = {}; 315 struct mmc_data data = {}; 316 struct scatterlist sg; 317 318 /* NOTE: caller guarantees ssr is heap-allocated */ 319 320 err = mmc_app_cmd(card->host, card); 321 if (err) 322 return err; 323 324 mrq.cmd = &cmd; 325 mrq.data = &data; 326 327 cmd.opcode = SD_APP_SD_STATUS; 328 cmd.arg = 0; 329 cmd.flags = MMC_RSP_SPI_R2 | 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, ssr, 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