1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * linux/drivers/mmc/core/sd_ops.h 4 * 5 * Copyright 2006-2007 Pierre Ossman 6 */ 7 8 #include <linux/slab.h> 9 #include <linux/types.h> 10 #include <linux/export.h> 11 #include <linux/scatterlist.h> 12 13 #include <linux/mmc/host.h> 14 #include <linux/mmc/card.h> 15 #include <linux/mmc/mmc.h> 16 #include <linux/mmc/sd.h> 17 18 #include "core.h" 19 #include "sd_ops.h" 20 21 int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card) 22 { 23 int err; 24 struct mmc_command cmd = {}; 25 26 if (WARN_ON(card && card->host != host)) 27 return -EINVAL; 28 29 cmd.opcode = MMC_APP_CMD; 30 31 if (card) { 32 cmd.arg = card->rca << 16; 33 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; 34 } else { 35 cmd.arg = 0; 36 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR; 37 } 38 39 err = mmc_wait_for_cmd(host, &cmd, 0); 40 if (err) 41 return err; 42 43 /* Check that card supported application commands */ 44 if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD)) 45 return -EOPNOTSUPP; 46 47 return 0; 48 } 49 EXPORT_SYMBOL_GPL(mmc_app_cmd); 50 51 static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card, 52 struct mmc_command *cmd) 53 { 54 struct mmc_request mrq = {}; 55 int i, err = -EIO; 56 57 /* 58 * We have to resend MMC_APP_CMD for each attempt so 59 * we cannot use the retries field in mmc_command. 60 */ 61 for (i = 0; i <= MMC_CMD_RETRIES; i++) { 62 err = mmc_app_cmd(host, card); 63 if (err) { 64 /* no point in retrying; no APP commands allowed */ 65 if (mmc_host_is_spi(host)) { 66 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 67 break; 68 } 69 continue; 70 } 71 72 memset(&mrq, 0, sizeof(struct mmc_request)); 73 74 memset(cmd->resp, 0, sizeof(cmd->resp)); 75 cmd->retries = 0; 76 77 mrq.cmd = cmd; 78 cmd->data = NULL; 79 80 mmc_wait_for_req(host, &mrq); 81 82 err = cmd->error; 83 if (!cmd->error) 84 break; 85 86 /* no point in retrying illegal APP commands */ 87 if (mmc_host_is_spi(host)) { 88 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND) 89 break; 90 } 91 } 92 93 return err; 94 } 95 96 int mmc_app_set_bus_width(struct mmc_card *card, int width) 97 { 98 struct mmc_command cmd = {}; 99 100 cmd.opcode = SD_APP_SET_BUS_WIDTH; 101 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; 102 103 switch (width) { 104 case MMC_BUS_WIDTH_1: 105 cmd.arg = SD_BUS_WIDTH_1; 106 break; 107 case MMC_BUS_WIDTH_4: 108 cmd.arg = SD_BUS_WIDTH_4; 109 break; 110 default: 111 return -EINVAL; 112 } 113 114 return mmc_wait_for_app_cmd(card->host, card, &cmd); 115 } 116 117 int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 118 { 119 struct mmc_command cmd = {}; 120 int i, err = 0; 121 122 cmd.opcode = SD_APP_OP_COND; 123 if (mmc_host_is_spi(host)) 124 cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */ 125 else 126 cmd.arg = ocr; 127 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR; 128 129 for (i = 100; i; i--) { 130 err = mmc_wait_for_app_cmd(host, NULL, &cmd); 131 if (err) 132 break; 133 134 /* if we're just probing, do a single pass */ 135 if (ocr == 0) 136 break; 137 138 /* otherwise wait until reset completes */ 139 if (mmc_host_is_spi(host)) { 140 if (!(cmd.resp[0] & R1_SPI_IDLE)) 141 break; 142 } else { 143 if (cmd.resp[0] & MMC_CARD_BUSY) 144 break; 145 } 146 147 err = -ETIMEDOUT; 148 149 mmc_delay(10); 150 } 151 152 if (!i) 153 pr_err("%s: card never left busy state\n", mmc_hostname(host)); 154 155 if (rocr && !mmc_host_is_spi(host)) 156 *rocr = cmd.resp[0]; 157 158 return err; 159 } 160 161 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 162 { 163 struct mmc_command cmd = {}; 164 int err; 165 static const u8 test_pattern = 0xAA; 166 u8 result_pattern; 167 168 /* 169 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 170 * before SD_APP_OP_COND. This command will harmlessly fail for 171 * SD 1.0 cards. 172 */ 173 cmd.opcode = SD_SEND_IF_COND; 174 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern; 175 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 176 177 err = mmc_wait_for_cmd(host, &cmd, 0); 178 if (err) 179 return err; 180 181 if (mmc_host_is_spi(host)) 182 result_pattern = cmd.resp[1] & 0xFF; 183 else 184 result_pattern = cmd.resp[0] & 0xFF; 185 186 if (result_pattern != test_pattern) 187 return -EIO; 188 189 return 0; 190 } 191 192 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 193 { 194 int err; 195 struct mmc_command cmd = {}; 196 197 cmd.opcode = SD_SEND_RELATIVE_ADDR; 198 cmd.arg = 0; 199 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 200 201 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 202 if (err) 203 return err; 204 205 *rca = cmd.resp[0] >> 16; 206 207 return 0; 208 } 209 210 int mmc_app_send_scr(struct mmc_card *card) 211 { 212 int err; 213 struct mmc_request mrq = {}; 214 struct mmc_command cmd = {}; 215 struct mmc_data data = {}; 216 struct scatterlist sg; 217 __be32 *scr; 218 219 /* NOTE: caller guarantees scr is heap-allocated */ 220 221 err = mmc_app_cmd(card->host, card); 222 if (err) 223 return err; 224 225 /* dma onto stack is unsafe/nonportable, but callers to this 226 * routine normally provide temporary on-stack buffers ... 227 */ 228 scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL); 229 if (!scr) 230 return -ENOMEM; 231 232 mrq.cmd = &cmd; 233 mrq.data = &data; 234 235 cmd.opcode = SD_APP_SEND_SCR; 236 cmd.arg = 0; 237 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 238 239 data.blksz = 8; 240 data.blocks = 1; 241 data.flags = MMC_DATA_READ; 242 data.sg = &sg; 243 data.sg_len = 1; 244 245 sg_init_one(&sg, scr, 8); 246 247 mmc_set_data_timeout(&data, card); 248 249 mmc_wait_for_req(card->host, &mrq); 250 251 card->raw_scr[0] = be32_to_cpu(scr[0]); 252 card->raw_scr[1] = be32_to_cpu(scr[1]); 253 254 kfree(scr); 255 256 if (cmd.error) 257 return cmd.error; 258 if (data.error) 259 return data.error; 260 261 return 0; 262 } 263 264 int mmc_sd_switch(struct mmc_card *card, int mode, int group, 265 u8 value, u8 *resp) 266 { 267 struct mmc_request mrq = {}; 268 struct mmc_command cmd = {}; 269 struct mmc_data data = {}; 270 struct scatterlist sg; 271 272 /* NOTE: caller guarantees resp is heap-allocated */ 273 274 mode = !!mode; 275 value &= 0xF; 276 277 mrq.cmd = &cmd; 278 mrq.data = &data; 279 280 cmd.opcode = SD_SWITCH; 281 cmd.arg = mode << 31 | 0x00FFFFFF; 282 cmd.arg &= ~(0xF << (group * 4)); 283 cmd.arg |= value << (group * 4); 284 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 285 286 data.blksz = 64; 287 data.blocks = 1; 288 data.flags = MMC_DATA_READ; 289 data.sg = &sg; 290 data.sg_len = 1; 291 292 sg_init_one(&sg, resp, 64); 293 294 mmc_set_data_timeout(&data, card); 295 296 mmc_wait_for_req(card->host, &mrq); 297 298 if (cmd.error) 299 return cmd.error; 300 if (data.error) 301 return data.error; 302 303 return 0; 304 } 305 306 int mmc_app_sd_status(struct mmc_card *card, void *ssr) 307 { 308 int err; 309 struct mmc_request mrq = {}; 310 struct mmc_command cmd = {}; 311 struct mmc_data data = {}; 312 struct scatterlist sg; 313 314 /* NOTE: caller guarantees ssr is heap-allocated */ 315 316 err = mmc_app_cmd(card->host, card); 317 if (err) 318 return err; 319 320 mrq.cmd = &cmd; 321 mrq.data = &data; 322 323 cmd.opcode = SD_APP_SD_STATUS; 324 cmd.arg = 0; 325 cmd.flags = MMC_RSP_SPI_R2 | 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, ssr, 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