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/types.h> 13 #include <asm/scatterlist.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 memset(&mrq, 0, sizeof(struct mmc_request)); 84 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; 125 126 BUG_ON(!card); 127 BUG_ON(!card->host); 128 129 memset(&cmd, 0, sizeof(struct mmc_command)); 130 131 cmd.opcode = SD_APP_SET_BUS_WIDTH; 132 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 133 134 switch (width) { 135 case MMC_BUS_WIDTH_1: 136 cmd.arg = SD_BUS_WIDTH_1; 137 break; 138 case MMC_BUS_WIDTH_4: 139 cmd.arg = SD_BUS_WIDTH_4; 140 break; 141 default: 142 return -EINVAL; 143 } 144 145 err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES); 146 if (err) 147 return err; 148 149 return 0; 150 } 151 152 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 153 { 154 struct mmc_command cmd; 155 int i, err = 0; 156 157 BUG_ON(!host); 158 159 memset(&cmd, 0, sizeof(struct mmc_command)); 160 161 cmd.opcode = SD_APP_OP_COND; 162 if (mmc_host_is_spi(host)) 163 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */ 164 else 165 cmd.arg = ocr; 166 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; 167 168 for (i = 100; i; i--) { 169 err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES); 170 if (err) 171 break; 172 173 /* if we're just probing, do a single pass */ 174 if (ocr == 0) 175 break; 176 177 /* otherwise wait until reset completes */ 178 if (mmc_host_is_spi(host)) { 179 if (!(cmd.resp[0] & R1_SPI_IDLE)) 180 break; 181 } else { 182 if (cmd.resp[0] & MMC_CARD_BUSY) 183 break; 184 } 185 186 err = -ETIMEDOUT; 187 188 mmc_delay(10); 189 } 190 191 if (rocr && !mmc_host_is_spi(host)) 192 *rocr = cmd.resp[0]; 193 194 return err; 195 } 196 197 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 198 { 199 struct mmc_command cmd; 200 int err; 201 static const u8 test_pattern = 0xAA; 202 u8 result_pattern; 203 204 /* 205 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 206 * before SD_APP_OP_COND. This command will harmlessly fail for 207 * SD 1.0 cards. 208 */ 209 cmd.opcode = SD_SEND_IF_COND; 210 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; 211 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 212 213 err = mmc_wait_for_cmd(host, &cmd, 0); 214 if (err) 215 return err; 216 217 if (mmc_host_is_spi(host)) 218 result_pattern = cmd.resp[1] & 0xFF; 219 else 220 result_pattern = cmd.resp[0] & 0xFF; 221 222 if (result_pattern != test_pattern) 223 return -EIO; 224 225 return 0; 226 } 227 228 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 229 { 230 int err; 231 struct mmc_command cmd; 232 233 BUG_ON(!host); 234 BUG_ON(!rca); 235 236 memset(&cmd, 0, sizeof(struct mmc_command)); 237 238 cmd.opcode = SD_SEND_RELATIVE_ADDR; 239 cmd.arg = 0; 240 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 241 242 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 243 if (err) 244 return err; 245 246 *rca = cmd.resp[0] >> 16; 247 248 return 0; 249 } 250 251 int mmc_app_send_scr(struct mmc_card *card, u32 *scr) 252 { 253 int err; 254 struct mmc_request mrq; 255 struct mmc_command cmd; 256 struct mmc_data data; 257 struct scatterlist sg; 258 259 BUG_ON(!card); 260 BUG_ON(!card->host); 261 BUG_ON(!scr); 262 263 /* NOTE: caller guarantees scr is heap-allocated */ 264 265 err = mmc_app_cmd(card->host, card); 266 if (err) 267 return err; 268 269 memset(&mrq, 0, sizeof(struct mmc_request)); 270 memset(&cmd, 0, sizeof(struct mmc_command)); 271 memset(&data, 0, sizeof(struct mmc_data)); 272 273 mrq.cmd = &cmd; 274 mrq.data = &data; 275 276 cmd.opcode = SD_APP_SEND_SCR; 277 cmd.arg = 0; 278 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 279 280 data.blksz = 8; 281 data.blocks = 1; 282 data.flags = MMC_DATA_READ; 283 data.sg = &sg; 284 data.sg_len = 1; 285 286 sg_init_one(&sg, scr, 8); 287 288 mmc_set_data_timeout(&data, card); 289 290 mmc_wait_for_req(card->host, &mrq); 291 292 if (cmd.error) 293 return cmd.error; 294 if (data.error) 295 return data.error; 296 297 scr[0] = ntohl(scr[0]); 298 scr[1] = ntohl(scr[1]); 299 300 return 0; 301 } 302 303 int mmc_sd_switch(struct mmc_card *card, int mode, int group, 304 u8 value, u8 *resp) 305 { 306 struct mmc_request mrq; 307 struct mmc_command cmd; 308 struct mmc_data data; 309 struct scatterlist sg; 310 311 BUG_ON(!card); 312 BUG_ON(!card->host); 313 314 /* NOTE: caller guarantees resp is heap-allocated */ 315 316 mode = !!mode; 317 value &= 0xF; 318 319 memset(&mrq, 0, sizeof(struct mmc_request)); 320 memset(&cmd, 0, sizeof(struct mmc_command)); 321 memset(&data, 0, sizeof(struct mmc_data)); 322 323 mrq.cmd = &cmd; 324 mrq.data = &data; 325 326 cmd.opcode = SD_SWITCH; 327 cmd.arg = mode << 31 | 0x00FFFFFF; 328 cmd.arg &= ~(0xF << (group * 4)); 329 cmd.arg |= value << (group * 4); 330 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 331 332 data.blksz = 64; 333 data.blocks = 1; 334 data.flags = MMC_DATA_READ; 335 data.sg = &sg; 336 data.sg_len = 1; 337 338 sg_init_one(&sg, resp, 64); 339 340 mmc_set_data_timeout(&data, card); 341 342 mmc_wait_for_req(card->host, &mrq); 343 344 if (cmd.error) 345 return cmd.error; 346 if (data.error) 347 return data.error; 348 349 return 0; 350 } 351 352