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 static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits, 162 u32 *resp) 163 { 164 struct mmc_command cmd = {}; 165 int err; 166 static const u8 test_pattern = 0xAA; 167 u8 result_pattern; 168 169 /* 170 * To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND 171 * before SD_APP_OP_COND. This command will harmlessly fail for 172 * SD 1.0 cards. 173 */ 174 cmd.opcode = SD_SEND_IF_COND; 175 cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | pcie_bits << 8 | test_pattern; 176 cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR; 177 178 err = mmc_wait_for_cmd(host, &cmd, 0); 179 if (err) 180 return err; 181 182 if (mmc_host_is_spi(host)) 183 result_pattern = cmd.resp[1] & 0xFF; 184 else 185 result_pattern = cmd.resp[0] & 0xFF; 186 187 if (result_pattern != test_pattern) 188 return -EIO; 189 190 if (resp) 191 *resp = cmd.resp[0]; 192 193 return 0; 194 } 195 196 int mmc_send_if_cond(struct mmc_host *host, u32 ocr) 197 { 198 return __mmc_send_if_cond(host, ocr, 0, NULL); 199 } 200 201 int mmc_send_if_cond_pcie(struct mmc_host *host, u32 ocr) 202 { 203 u32 resp = 0; 204 u8 pcie_bits = 0; 205 int ret; 206 207 if (host->caps2 & MMC_CAP2_SD_EXP) { 208 /* Probe card for SD express support via PCIe. */ 209 pcie_bits = 0x10; 210 if (host->caps2 & MMC_CAP2_SD_EXP_1_2V) 211 /* Probe also for 1.2V support. */ 212 pcie_bits = 0x30; 213 } 214 215 ret = __mmc_send_if_cond(host, ocr, pcie_bits, &resp); 216 if (ret) 217 return 0; 218 219 /* Continue with the SD express init, if the card supports it. */ 220 resp &= 0x3000; 221 if (pcie_bits && resp) { 222 if (resp == 0x3000) 223 host->ios.timing = MMC_TIMING_SD_EXP_1_2V; 224 else 225 host->ios.timing = MMC_TIMING_SD_EXP; 226 227 /* 228 * According to the spec the clock shall also be gated, but 229 * let's leave this to the host driver for more flexibility. 230 */ 231 return host->ops->init_sd_express(host, &host->ios); 232 } 233 234 return 0; 235 } 236 237 int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca) 238 { 239 int err; 240 struct mmc_command cmd = {}; 241 242 cmd.opcode = SD_SEND_RELATIVE_ADDR; 243 cmd.arg = 0; 244 cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR; 245 246 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES); 247 if (err) 248 return err; 249 250 *rca = cmd.resp[0] >> 16; 251 252 return 0; 253 } 254 255 int mmc_app_send_scr(struct mmc_card *card) 256 { 257 int err; 258 struct mmc_request mrq = {}; 259 struct mmc_command cmd = {}; 260 struct mmc_data data = {}; 261 struct scatterlist sg; 262 __be32 *scr; 263 264 /* NOTE: caller guarantees scr is heap-allocated */ 265 266 err = mmc_app_cmd(card->host, card); 267 if (err) 268 return err; 269 270 /* dma onto stack is unsafe/nonportable, but callers to this 271 * routine normally provide temporary on-stack buffers ... 272 */ 273 scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL); 274 if (!scr) 275 return -ENOMEM; 276 277 mrq.cmd = &cmd; 278 mrq.data = &data; 279 280 cmd.opcode = SD_APP_SEND_SCR; 281 cmd.arg = 0; 282 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 283 284 data.blksz = 8; 285 data.blocks = 1; 286 data.flags = MMC_DATA_READ; 287 data.sg = &sg; 288 data.sg_len = 1; 289 290 sg_init_one(&sg, scr, 8); 291 292 mmc_set_data_timeout(&data, card); 293 294 mmc_wait_for_req(card->host, &mrq); 295 296 card->raw_scr[0] = be32_to_cpu(scr[0]); 297 card->raw_scr[1] = be32_to_cpu(scr[1]); 298 299 kfree(scr); 300 301 if (cmd.error) 302 return cmd.error; 303 if (data.error) 304 return data.error; 305 306 return 0; 307 } 308 309 int mmc_sd_switch(struct mmc_card *card, int mode, int group, 310 u8 value, u8 *resp) 311 { 312 struct mmc_request mrq = {}; 313 struct mmc_command cmd = {}; 314 struct mmc_data data = {}; 315 struct scatterlist sg; 316 317 /* NOTE: caller guarantees resp is heap-allocated */ 318 319 mode = !!mode; 320 value &= 0xF; 321 322 mrq.cmd = &cmd; 323 mrq.data = &data; 324 325 cmd.opcode = SD_SWITCH; 326 cmd.arg = mode << 31 | 0x00FFFFFF; 327 cmd.arg &= ~(0xF << (group * 4)); 328 cmd.arg |= value << (group * 4); 329 cmd.flags = MMC_RSP_SPI_R1 | 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, resp, 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 } 350 351 int mmc_app_sd_status(struct mmc_card *card, void *ssr) 352 { 353 int err; 354 struct mmc_request mrq = {}; 355 struct mmc_command cmd = {}; 356 struct mmc_data data = {}; 357 struct scatterlist sg; 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