1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/mmc/core/sd.c 4 * 5 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 6 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 7 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 8 */ 9 10 #include <linux/err.h> 11 #include <linux/sizes.h> 12 #include <linux/slab.h> 13 #include <linux/stat.h> 14 #include <linux/pm_runtime.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 "card.h" 23 #include "host.h" 24 #include "bus.h" 25 #include "mmc_ops.h" 26 #include "sd.h" 27 #include "sd_ops.h" 28 29 static const unsigned int tran_exp[] = { 30 10000, 100000, 1000000, 10000000, 31 0, 0, 0, 0 32 }; 33 34 static const unsigned char tran_mant[] = { 35 0, 10, 12, 13, 15, 20, 25, 30, 36 35, 40, 45, 50, 55, 60, 70, 80, 37 }; 38 39 static const unsigned int taac_exp[] = { 40 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 41 }; 42 43 static const unsigned int taac_mant[] = { 44 0, 10, 12, 13, 15, 20, 25, 30, 45 35, 40, 45, 50, 55, 60, 70, 80, 46 }; 47 48 static const unsigned int sd_au_size[] = { 49 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, 50 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, 51 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, 52 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, 53 }; 54 55 #define UNSTUFF_BITS(resp,start,size) \ 56 ({ \ 57 const int __size = size; \ 58 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 59 const int __off = 3 - ((start) / 32); \ 60 const int __shft = (start) & 31; \ 61 u32 __res; \ 62 \ 63 __res = resp[__off] >> __shft; \ 64 if (__size + __shft > 32) \ 65 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 66 __res & __mask; \ 67 }) 68 69 /* 70 * Given the decoded CSD structure, decode the raw CID to our CID structure. 71 */ 72 void mmc_decode_cid(struct mmc_card *card) 73 { 74 u32 *resp = card->raw_cid; 75 76 /* 77 * SD doesn't currently have a version field so we will 78 * have to assume we can parse this. 79 */ 80 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 81 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 82 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 83 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 84 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 85 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 86 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 87 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 88 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 89 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 90 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 91 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 92 93 card->cid.year += 2000; /* SD cards year offset */ 94 } 95 96 /* 97 * Given a 128-bit response, decode to our card CSD structure. 98 */ 99 static int mmc_decode_csd(struct mmc_card *card) 100 { 101 struct mmc_csd *csd = &card->csd; 102 unsigned int e, m, csd_struct; 103 u32 *resp = card->raw_csd; 104 105 csd_struct = UNSTUFF_BITS(resp, 126, 2); 106 107 switch (csd_struct) { 108 case 0: 109 m = UNSTUFF_BITS(resp, 115, 4); 110 e = UNSTUFF_BITS(resp, 112, 3); 111 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10; 112 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 113 114 m = UNSTUFF_BITS(resp, 99, 4); 115 e = UNSTUFF_BITS(resp, 96, 3); 116 csd->max_dtr = tran_exp[e] * tran_mant[m]; 117 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 118 119 e = UNSTUFF_BITS(resp, 47, 3); 120 m = UNSTUFF_BITS(resp, 62, 12); 121 csd->capacity = (1 + m) << (e + 2); 122 123 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 124 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 125 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 126 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 127 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1); 128 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 129 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 130 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 131 132 if (UNSTUFF_BITS(resp, 46, 1)) { 133 csd->erase_size = 1; 134 } else if (csd->write_blkbits >= 9) { 135 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 136 csd->erase_size <<= csd->write_blkbits - 9; 137 } 138 break; 139 case 1: 140 /* 141 * This is a block-addressed SDHC or SDXC card. Most 142 * interesting fields are unused and have fixed 143 * values. To avoid getting tripped by buggy cards, 144 * we assume those fixed values ourselves. 145 */ 146 mmc_card_set_blockaddr(card); 147 148 csd->taac_ns = 0; /* Unused */ 149 csd->taac_clks = 0; /* Unused */ 150 151 m = UNSTUFF_BITS(resp, 99, 4); 152 e = UNSTUFF_BITS(resp, 96, 3); 153 csd->max_dtr = tran_exp[e] * tran_mant[m]; 154 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 155 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 156 157 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 158 if (csd->c_size >= 0xFFFF) 159 mmc_card_set_ext_capacity(card); 160 161 m = UNSTUFF_BITS(resp, 48, 22); 162 csd->capacity = (1 + m) << 10; 163 164 csd->read_blkbits = 9; 165 csd->read_partial = 0; 166 csd->write_misalign = 0; 167 csd->read_misalign = 0; 168 csd->r2w_factor = 4; /* Unused */ 169 csd->write_blkbits = 9; 170 csd->write_partial = 0; 171 csd->erase_size = 1; 172 break; 173 default: 174 pr_err("%s: unrecognised CSD structure version %d\n", 175 mmc_hostname(card->host), csd_struct); 176 return -EINVAL; 177 } 178 179 card->erase_size = csd->erase_size; 180 181 return 0; 182 } 183 184 /* 185 * Given a 64-bit response, decode to our card SCR structure. 186 */ 187 static int mmc_decode_scr(struct mmc_card *card) 188 { 189 struct sd_scr *scr = &card->scr; 190 unsigned int scr_struct; 191 u32 resp[4]; 192 193 resp[3] = card->raw_scr[1]; 194 resp[2] = card->raw_scr[0]; 195 196 scr_struct = UNSTUFF_BITS(resp, 60, 4); 197 if (scr_struct != 0) { 198 pr_err("%s: unrecognised SCR structure version %d\n", 199 mmc_hostname(card->host), scr_struct); 200 return -EINVAL; 201 } 202 203 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 204 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 205 if (scr->sda_vsn == SCR_SPEC_VER_2) 206 /* Check if Physical Layer Spec v3.0 is supported */ 207 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 208 209 if (scr->sda_spec3) { 210 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1); 211 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4); 212 } 213 214 if (UNSTUFF_BITS(resp, 55, 1)) 215 card->erased_byte = 0xFF; 216 else 217 card->erased_byte = 0x0; 218 219 if (scr->sda_spec3) 220 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 221 222 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */ 223 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || 224 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { 225 pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); 226 return -EINVAL; 227 } 228 229 return 0; 230 } 231 232 /* 233 * Fetch and process SD Status register. 234 */ 235 static int mmc_read_ssr(struct mmc_card *card) 236 { 237 unsigned int au, es, et, eo; 238 __be32 *raw_ssr; 239 u32 resp[4] = {}; 240 u8 discard_support; 241 int i; 242 243 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 244 pr_warn("%s: card lacks mandatory SD Status function\n", 245 mmc_hostname(card->host)); 246 return 0; 247 } 248 249 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL); 250 if (!raw_ssr) 251 return -ENOMEM; 252 253 if (mmc_app_sd_status(card, raw_ssr)) { 254 pr_warn("%s: problem reading SD Status register\n", 255 mmc_hostname(card->host)); 256 kfree(raw_ssr); 257 return 0; 258 } 259 260 for (i = 0; i < 16; i++) 261 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]); 262 263 kfree(raw_ssr); 264 265 /* 266 * UNSTUFF_BITS only works with four u32s so we have to offset the 267 * bitfield positions accordingly. 268 */ 269 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4); 270 if (au) { 271 if (au <= 9 || card->scr.sda_spec3) { 272 card->ssr.au = sd_au_size[au]; 273 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16); 274 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6); 275 if (es && et) { 276 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2); 277 card->ssr.erase_timeout = (et * 1000) / es; 278 card->ssr.erase_offset = eo * 1000; 279 } 280 } else { 281 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 282 mmc_hostname(card->host)); 283 } 284 } 285 286 /* 287 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set 288 */ 289 resp[3] = card->raw_ssr[6]; 290 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1); 291 card->erase_arg = (card->scr.sda_specx && discard_support) ? 292 SD_DISCARD_ARG : SD_ERASE_ARG; 293 294 return 0; 295 } 296 297 /* 298 * Fetches and decodes switch information 299 */ 300 static int mmc_read_switch(struct mmc_card *card) 301 { 302 int err; 303 u8 *status; 304 305 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 306 return 0; 307 308 if (!(card->csd.cmdclass & CCC_SWITCH)) { 309 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", 310 mmc_hostname(card->host)); 311 return 0; 312 } 313 314 status = kmalloc(64, GFP_KERNEL); 315 if (!status) 316 return -ENOMEM; 317 318 /* 319 * Find out the card's support bits with a mode 0 operation. 320 * The argument does not matter, as the support bits do not 321 * change with the arguments. 322 */ 323 err = mmc_sd_switch(card, 0, 0, 0, status); 324 if (err) { 325 /* 326 * If the host or the card can't do the switch, 327 * fail more gracefully. 328 */ 329 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 330 goto out; 331 332 pr_warn("%s: problem reading Bus Speed modes\n", 333 mmc_hostname(card->host)); 334 err = 0; 335 336 goto out; 337 } 338 339 if (status[13] & SD_MODE_HIGH_SPEED) 340 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 341 342 if (card->scr.sda_spec3) { 343 card->sw_caps.sd3_bus_mode = status[13]; 344 /* Driver Strengths supported by the card */ 345 card->sw_caps.sd3_drv_type = status[9]; 346 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 347 } 348 349 out: 350 kfree(status); 351 352 return err; 353 } 354 355 /* 356 * Test if the card supports high-speed mode and, if so, switch to it. 357 */ 358 int mmc_sd_switch_hs(struct mmc_card *card) 359 { 360 int err; 361 u8 *status; 362 363 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 364 return 0; 365 366 if (!(card->csd.cmdclass & CCC_SWITCH)) 367 return 0; 368 369 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 370 return 0; 371 372 if (card->sw_caps.hs_max_dtr == 0) 373 return 0; 374 375 status = kmalloc(64, GFP_KERNEL); 376 if (!status) 377 return -ENOMEM; 378 379 err = mmc_sd_switch(card, 1, 0, 1, status); 380 if (err) 381 goto out; 382 383 if ((status[16] & 0xF) != 1) { 384 pr_warn("%s: Problem switching card into high-speed mode!\n", 385 mmc_hostname(card->host)); 386 err = 0; 387 } else { 388 err = 1; 389 } 390 391 out: 392 kfree(status); 393 394 return err; 395 } 396 397 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 398 { 399 int card_drv_type, drive_strength, drv_type; 400 int err; 401 402 card->drive_strength = 0; 403 404 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 405 406 drive_strength = mmc_select_drive_strength(card, 407 card->sw_caps.uhs_max_dtr, 408 card_drv_type, &drv_type); 409 410 if (drive_strength) { 411 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 412 if (err) 413 return err; 414 if ((status[15] & 0xF) != drive_strength) { 415 pr_warn("%s: Problem setting drive strength!\n", 416 mmc_hostname(card->host)); 417 return 0; 418 } 419 card->drive_strength = drive_strength; 420 } 421 422 if (drv_type) 423 mmc_set_driver_type(card->host, drv_type); 424 425 return 0; 426 } 427 428 static void sd_update_bus_speed_mode(struct mmc_card *card) 429 { 430 /* 431 * If the host doesn't support any of the UHS-I modes, fallback on 432 * default speed. 433 */ 434 if (!mmc_host_uhs(card->host)) { 435 card->sd_bus_speed = 0; 436 return; 437 } 438 439 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 440 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 441 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 442 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 443 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 444 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 445 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 446 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 447 SD_MODE_UHS_SDR50)) { 448 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 449 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 450 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 451 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 452 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 453 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 454 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 455 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 456 SD_MODE_UHS_SDR12)) { 457 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 458 } 459 } 460 461 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 462 { 463 int err; 464 unsigned int timing = 0; 465 466 switch (card->sd_bus_speed) { 467 case UHS_SDR104_BUS_SPEED: 468 timing = MMC_TIMING_UHS_SDR104; 469 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 470 break; 471 case UHS_DDR50_BUS_SPEED: 472 timing = MMC_TIMING_UHS_DDR50; 473 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 474 break; 475 case UHS_SDR50_BUS_SPEED: 476 timing = MMC_TIMING_UHS_SDR50; 477 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 478 break; 479 case UHS_SDR25_BUS_SPEED: 480 timing = MMC_TIMING_UHS_SDR25; 481 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 482 break; 483 case UHS_SDR12_BUS_SPEED: 484 timing = MMC_TIMING_UHS_SDR12; 485 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 486 break; 487 default: 488 return 0; 489 } 490 491 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 492 if (err) 493 return err; 494 495 if ((status[16] & 0xF) != card->sd_bus_speed) 496 pr_warn("%s: Problem setting bus speed mode!\n", 497 mmc_hostname(card->host)); 498 else { 499 mmc_set_timing(card->host, timing); 500 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 501 } 502 503 return 0; 504 } 505 506 /* Get host's max current setting at its current voltage */ 507 static u32 sd_get_host_max_current(struct mmc_host *host) 508 { 509 u32 voltage, max_current; 510 511 voltage = 1 << host->ios.vdd; 512 switch (voltage) { 513 case MMC_VDD_165_195: 514 max_current = host->max_current_180; 515 break; 516 case MMC_VDD_29_30: 517 case MMC_VDD_30_31: 518 max_current = host->max_current_300; 519 break; 520 case MMC_VDD_32_33: 521 case MMC_VDD_33_34: 522 max_current = host->max_current_330; 523 break; 524 default: 525 max_current = 0; 526 } 527 528 return max_current; 529 } 530 531 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 532 { 533 int current_limit = SD_SET_CURRENT_NO_CHANGE; 534 int err; 535 u32 max_current; 536 537 /* 538 * Current limit switch is only defined for SDR50, SDR104, and DDR50 539 * bus speed modes. For other bus speed modes, we do not change the 540 * current limit. 541 */ 542 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 543 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 544 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 545 return 0; 546 547 /* 548 * Host has different current capabilities when operating at 549 * different voltages, so find out its max current first. 550 */ 551 max_current = sd_get_host_max_current(card->host); 552 553 /* 554 * We only check host's capability here, if we set a limit that is 555 * higher than the card's maximum current, the card will be using its 556 * maximum current, e.g. if the card's maximum current is 300ma, and 557 * when we set current limit to 200ma, the card will draw 200ma, and 558 * when we set current limit to 400/600/800ma, the card will draw its 559 * maximum 300ma from the host. 560 * 561 * The above is incorrect: if we try to set a current limit that is 562 * not supported by the card, the card can rightfully error out the 563 * attempt, and remain at the default current limit. This results 564 * in a 300mA card being limited to 200mA even though the host 565 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 566 * an iMX6 host. --rmk 567 */ 568 if (max_current >= 800 && 569 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 570 current_limit = SD_SET_CURRENT_LIMIT_800; 571 else if (max_current >= 600 && 572 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 573 current_limit = SD_SET_CURRENT_LIMIT_600; 574 else if (max_current >= 400 && 575 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 576 current_limit = SD_SET_CURRENT_LIMIT_400; 577 else if (max_current >= 200 && 578 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 579 current_limit = SD_SET_CURRENT_LIMIT_200; 580 581 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 582 err = mmc_sd_switch(card, 1, 3, current_limit, status); 583 if (err) 584 return err; 585 586 if (((status[15] >> 4) & 0x0F) != current_limit) 587 pr_warn("%s: Problem setting current limit!\n", 588 mmc_hostname(card->host)); 589 590 } 591 592 return 0; 593 } 594 595 /* 596 * UHS-I specific initialization procedure 597 */ 598 static int mmc_sd_init_uhs_card(struct mmc_card *card) 599 { 600 int err; 601 u8 *status; 602 603 if (!(card->csd.cmdclass & CCC_SWITCH)) 604 return 0; 605 606 status = kmalloc(64, GFP_KERNEL); 607 if (!status) 608 return -ENOMEM; 609 610 /* Set 4-bit bus width */ 611 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 612 if (err) 613 goto out; 614 615 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 616 617 /* 618 * Select the bus speed mode depending on host 619 * and card capability. 620 */ 621 sd_update_bus_speed_mode(card); 622 623 /* Set the driver strength for the card */ 624 err = sd_select_driver_type(card, status); 625 if (err) 626 goto out; 627 628 /* Set current limit for the card */ 629 err = sd_set_current_limit(card, status); 630 if (err) 631 goto out; 632 633 /* Set bus speed mode of the card */ 634 err = sd_set_bus_speed_mode(card, status); 635 if (err) 636 goto out; 637 638 /* 639 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 640 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 641 */ 642 if (!mmc_host_is_spi(card->host) && 643 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 644 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 645 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 646 err = mmc_execute_tuning(card); 647 648 /* 649 * As SD Specifications Part1 Physical Layer Specification 650 * Version 3.01 says, CMD19 tuning is available for unlocked 651 * cards in transfer state of 1.8V signaling mode. The small 652 * difference between v3.00 and 3.01 spec means that CMD19 653 * tuning is also available for DDR50 mode. 654 */ 655 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 656 pr_warn("%s: ddr50 tuning failed\n", 657 mmc_hostname(card->host)); 658 err = 0; 659 } 660 } 661 662 out: 663 kfree(status); 664 665 return err; 666 } 667 668 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 669 card->raw_cid[2], card->raw_cid[3]); 670 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 671 card->raw_csd[2], card->raw_csd[3]); 672 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 673 MMC_DEV_ATTR(ssr, 674 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", 675 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], 676 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], 677 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], 678 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], 679 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], 680 card->raw_ssr[15]); 681 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 682 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 683 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 684 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 685 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 686 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 687 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 688 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 689 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 690 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 691 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 692 693 694 static ssize_t mmc_dsr_show(struct device *dev, 695 struct device_attribute *attr, 696 char *buf) 697 { 698 struct mmc_card *card = mmc_dev_to_card(dev); 699 struct mmc_host *host = card->host; 700 701 if (card->csd.dsr_imp && host->dsr_req) 702 return sprintf(buf, "0x%x\n", host->dsr); 703 else 704 /* return default DSR value */ 705 return sprintf(buf, "0x%x\n", 0x404); 706 } 707 708 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); 709 710 static struct attribute *sd_std_attrs[] = { 711 &dev_attr_cid.attr, 712 &dev_attr_csd.attr, 713 &dev_attr_scr.attr, 714 &dev_attr_ssr.attr, 715 &dev_attr_date.attr, 716 &dev_attr_erase_size.attr, 717 &dev_attr_preferred_erase_size.attr, 718 &dev_attr_fwrev.attr, 719 &dev_attr_hwrev.attr, 720 &dev_attr_manfid.attr, 721 &dev_attr_name.attr, 722 &dev_attr_oemid.attr, 723 &dev_attr_serial.attr, 724 &dev_attr_ocr.attr, 725 &dev_attr_rca.attr, 726 &dev_attr_dsr.attr, 727 NULL, 728 }; 729 ATTRIBUTE_GROUPS(sd_std); 730 731 struct device_type sd_type = { 732 .groups = sd_std_groups, 733 }; 734 735 /* 736 * Fetch CID from card. 737 */ 738 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 739 { 740 int err; 741 u32 max_current; 742 int retries = 10; 743 u32 pocr = ocr; 744 745 try_again: 746 if (!retries) { 747 ocr &= ~SD_OCR_S18R; 748 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 749 } 750 751 /* 752 * Since we're changing the OCR value, we seem to 753 * need to tell some cards to go back to the idle 754 * state. We wait 1ms to give cards time to 755 * respond. 756 */ 757 mmc_go_idle(host); 758 759 /* 760 * If SD_SEND_IF_COND indicates an SD 2.0 761 * compliant card and we should set bit 30 762 * of the ocr to indicate that we can handle 763 * block-addressed SDHC cards. 764 */ 765 err = mmc_send_if_cond(host, ocr); 766 if (!err) 767 ocr |= SD_OCR_CCS; 768 769 /* 770 * If the host supports one of UHS-I modes, request the card 771 * to switch to 1.8V signaling level. If the card has failed 772 * repeatedly to switch however, skip this. 773 */ 774 if (retries && mmc_host_uhs(host)) 775 ocr |= SD_OCR_S18R; 776 777 /* 778 * If the host can supply more than 150mA at current voltage, 779 * XPC should be set to 1. 780 */ 781 max_current = sd_get_host_max_current(host); 782 if (max_current > 150) 783 ocr |= SD_OCR_XPC; 784 785 err = mmc_send_app_op_cond(host, ocr, rocr); 786 if (err) 787 return err; 788 789 /* 790 * In case CCS and S18A in the response is set, start Signal Voltage 791 * Switch procedure. SPI mode doesn't support CMD11. 792 */ 793 if (!mmc_host_is_spi(host) && rocr && 794 ((*rocr & 0x41000000) == 0x41000000)) { 795 err = mmc_set_uhs_voltage(host, pocr); 796 if (err == -EAGAIN) { 797 retries--; 798 goto try_again; 799 } else if (err) { 800 retries = 0; 801 goto try_again; 802 } 803 } 804 805 err = mmc_send_cid(host, cid); 806 return err; 807 } 808 809 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 810 { 811 int err; 812 813 /* 814 * Fetch CSD from card. 815 */ 816 err = mmc_send_csd(card, card->raw_csd); 817 if (err) 818 return err; 819 820 err = mmc_decode_csd(card); 821 if (err) 822 return err; 823 824 return 0; 825 } 826 827 static int mmc_sd_get_ro(struct mmc_host *host) 828 { 829 int ro; 830 831 /* 832 * Some systems don't feature a write-protect pin and don't need one. 833 * E.g. because they only have micro-SD card slot. For those systems 834 * assume that the SD card is always read-write. 835 */ 836 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 837 return 0; 838 839 if (!host->ops->get_ro) 840 return -1; 841 842 ro = host->ops->get_ro(host); 843 844 return ro; 845 } 846 847 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 848 bool reinit) 849 { 850 int err; 851 852 if (!reinit) { 853 /* 854 * Fetch SCR from card. 855 */ 856 err = mmc_app_send_scr(card); 857 if (err) 858 return err; 859 860 err = mmc_decode_scr(card); 861 if (err) 862 return err; 863 864 /* 865 * Fetch and process SD Status register. 866 */ 867 err = mmc_read_ssr(card); 868 if (err) 869 return err; 870 871 /* Erase init depends on CSD and SSR */ 872 mmc_init_erase(card); 873 874 /* 875 * Fetch switch information from card. 876 */ 877 err = mmc_read_switch(card); 878 if (err) 879 return err; 880 } 881 882 /* 883 * For SPI, enable CRC as appropriate. 884 * This CRC enable is located AFTER the reading of the 885 * card registers because some SDHC cards are not able 886 * to provide valid CRCs for non-512-byte blocks. 887 */ 888 if (mmc_host_is_spi(host)) { 889 err = mmc_spi_set_crc(host, use_spi_crc); 890 if (err) 891 return err; 892 } 893 894 /* 895 * Check if read-only switch is active. 896 */ 897 if (!reinit) { 898 int ro = mmc_sd_get_ro(host); 899 900 if (ro < 0) { 901 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 902 mmc_hostname(host)); 903 } else if (ro > 0) { 904 mmc_card_set_readonly(card); 905 } 906 } 907 908 return 0; 909 } 910 911 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 912 { 913 unsigned max_dtr = (unsigned int)-1; 914 915 if (mmc_card_hs(card)) { 916 if (max_dtr > card->sw_caps.hs_max_dtr) 917 max_dtr = card->sw_caps.hs_max_dtr; 918 } else if (max_dtr > card->csd.max_dtr) { 919 max_dtr = card->csd.max_dtr; 920 } 921 922 return max_dtr; 923 } 924 925 static bool mmc_sd_card_using_v18(struct mmc_card *card) 926 { 927 /* 928 * According to the SD spec., the Bus Speed Mode (function group 1) bits 929 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus 930 * they can be used to determine if the card has already switched to 931 * 1.8V signaling. 932 */ 933 return card->sw_caps.sd3_bus_mode & 934 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); 935 } 936 937 /* 938 * Handle the detection and initialisation of a card. 939 * 940 * In the case of a resume, "oldcard" will contain the card 941 * we're trying to reinitialise. 942 */ 943 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 944 struct mmc_card *oldcard) 945 { 946 struct mmc_card *card; 947 int err; 948 u32 cid[4]; 949 u32 rocr = 0; 950 bool v18_fixup_failed = false; 951 952 WARN_ON(!host->claimed); 953 retry: 954 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 955 if (err) 956 return err; 957 958 if (oldcard) { 959 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 960 pr_debug("%s: Perhaps the card was replaced\n", 961 mmc_hostname(host)); 962 return -ENOENT; 963 } 964 965 card = oldcard; 966 } else { 967 /* 968 * Allocate card structure. 969 */ 970 card = mmc_alloc_card(host, &sd_type); 971 if (IS_ERR(card)) 972 return PTR_ERR(card); 973 974 card->ocr = ocr; 975 card->type = MMC_TYPE_SD; 976 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 977 } 978 979 /* 980 * Call the optional HC's init_card function to handle quirks. 981 */ 982 if (host->ops->init_card) 983 host->ops->init_card(host, card); 984 985 /* 986 * For native busses: get card RCA and quit open drain mode. 987 */ 988 if (!mmc_host_is_spi(host)) { 989 err = mmc_send_relative_addr(host, &card->rca); 990 if (err) 991 goto free_card; 992 } 993 994 if (!oldcard) { 995 err = mmc_sd_get_csd(host, card); 996 if (err) 997 goto free_card; 998 999 mmc_decode_cid(card); 1000 } 1001 1002 /* 1003 * handling only for cards supporting DSR and hosts requesting 1004 * DSR configuration 1005 */ 1006 if (card->csd.dsr_imp && host->dsr_req) 1007 mmc_set_dsr(host); 1008 1009 /* 1010 * Select card, as all following commands rely on that. 1011 */ 1012 if (!mmc_host_is_spi(host)) { 1013 err = mmc_select_card(card); 1014 if (err) 1015 goto free_card; 1016 } 1017 1018 err = mmc_sd_setup_card(host, card, oldcard != NULL); 1019 if (err) 1020 goto free_card; 1021 1022 /* 1023 * If the card has not been power cycled, it may still be using 1.8V 1024 * signaling. Detect that situation and try to initialize a UHS-I (1.8V) 1025 * transfer mode. 1026 */ 1027 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && 1028 mmc_sd_card_using_v18(card) && 1029 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { 1030 /* 1031 * Re-read switch information in case it has changed since 1032 * oldcard was initialized. 1033 */ 1034 if (oldcard) { 1035 err = mmc_read_switch(card); 1036 if (err) 1037 goto free_card; 1038 } 1039 if (mmc_sd_card_using_v18(card)) { 1040 if (mmc_host_set_uhs_voltage(host) || 1041 mmc_sd_init_uhs_card(card)) { 1042 v18_fixup_failed = true; 1043 mmc_power_cycle(host, ocr); 1044 if (!oldcard) 1045 mmc_remove_card(card); 1046 goto retry; 1047 } 1048 goto done; 1049 } 1050 } 1051 1052 /* Initialization sequence for UHS-I cards */ 1053 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { 1054 err = mmc_sd_init_uhs_card(card); 1055 if (err) 1056 goto free_card; 1057 } else { 1058 /* 1059 * Attempt to change to high-speed (if supported) 1060 */ 1061 err = mmc_sd_switch_hs(card); 1062 if (err > 0) 1063 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1064 else if (err) 1065 goto free_card; 1066 1067 /* 1068 * Set bus speed. 1069 */ 1070 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1071 1072 /* 1073 * Switch to wider bus (if supported). 1074 */ 1075 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1076 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1077 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1078 if (err) 1079 goto free_card; 1080 1081 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1082 } 1083 } 1084 1085 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 1086 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 1087 pr_err("%s: Host failed to negotiate down from 3.3V\n", 1088 mmc_hostname(host)); 1089 err = -EINVAL; 1090 goto free_card; 1091 } 1092 done: 1093 host->card = card; 1094 return 0; 1095 1096 free_card: 1097 if (!oldcard) 1098 mmc_remove_card(card); 1099 1100 return err; 1101 } 1102 1103 /* 1104 * Host is being removed. Free up the current card. 1105 */ 1106 static void mmc_sd_remove(struct mmc_host *host) 1107 { 1108 mmc_remove_card(host->card); 1109 host->card = NULL; 1110 } 1111 1112 /* 1113 * Card detection - card is alive. 1114 */ 1115 static int mmc_sd_alive(struct mmc_host *host) 1116 { 1117 return mmc_send_status(host->card, NULL); 1118 } 1119 1120 /* 1121 * Card detection callback from host. 1122 */ 1123 static void mmc_sd_detect(struct mmc_host *host) 1124 { 1125 int err; 1126 1127 mmc_get_card(host->card, NULL); 1128 1129 /* 1130 * Just check if our card has been removed. 1131 */ 1132 err = _mmc_detect_card_removed(host); 1133 1134 mmc_put_card(host->card, NULL); 1135 1136 if (err) { 1137 mmc_sd_remove(host); 1138 1139 mmc_claim_host(host); 1140 mmc_detach_bus(host); 1141 mmc_power_off(host); 1142 mmc_release_host(host); 1143 } 1144 } 1145 1146 static int _mmc_sd_suspend(struct mmc_host *host) 1147 { 1148 int err = 0; 1149 1150 mmc_claim_host(host); 1151 1152 if (mmc_card_suspended(host->card)) 1153 goto out; 1154 1155 if (!mmc_host_is_spi(host)) 1156 err = mmc_deselect_cards(host); 1157 1158 if (!err) { 1159 mmc_power_off(host); 1160 mmc_card_set_suspended(host->card); 1161 } 1162 1163 out: 1164 mmc_release_host(host); 1165 return err; 1166 } 1167 1168 /* 1169 * Callback for suspend 1170 */ 1171 static int mmc_sd_suspend(struct mmc_host *host) 1172 { 1173 int err; 1174 1175 err = _mmc_sd_suspend(host); 1176 if (!err) { 1177 pm_runtime_disable(&host->card->dev); 1178 pm_runtime_set_suspended(&host->card->dev); 1179 } 1180 1181 return err; 1182 } 1183 1184 /* 1185 * This function tries to determine if the same card is still present 1186 * and, if so, restore all state to it. 1187 */ 1188 static int _mmc_sd_resume(struct mmc_host *host) 1189 { 1190 int err = 0; 1191 1192 mmc_claim_host(host); 1193 1194 if (!mmc_card_suspended(host->card)) 1195 goto out; 1196 1197 mmc_power_up(host, host->card->ocr); 1198 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1199 mmc_card_clr_suspended(host->card); 1200 1201 out: 1202 mmc_release_host(host); 1203 return err; 1204 } 1205 1206 /* 1207 * Callback for resume 1208 */ 1209 static int mmc_sd_resume(struct mmc_host *host) 1210 { 1211 pm_runtime_enable(&host->card->dev); 1212 return 0; 1213 } 1214 1215 /* 1216 * Callback for runtime_suspend. 1217 */ 1218 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1219 { 1220 int err; 1221 1222 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1223 return 0; 1224 1225 err = _mmc_sd_suspend(host); 1226 if (err) 1227 pr_err("%s: error %d doing aggressive suspend\n", 1228 mmc_hostname(host), err); 1229 1230 return err; 1231 } 1232 1233 /* 1234 * Callback for runtime_resume. 1235 */ 1236 static int mmc_sd_runtime_resume(struct mmc_host *host) 1237 { 1238 int err; 1239 1240 err = _mmc_sd_resume(host); 1241 if (err && err != -ENOMEDIUM) 1242 pr_err("%s: error %d doing runtime resume\n", 1243 mmc_hostname(host), err); 1244 1245 return 0; 1246 } 1247 1248 static int mmc_sd_hw_reset(struct mmc_host *host) 1249 { 1250 mmc_power_cycle(host, host->card->ocr); 1251 return mmc_sd_init_card(host, host->card->ocr, host->card); 1252 } 1253 1254 static const struct mmc_bus_ops mmc_sd_ops = { 1255 .remove = mmc_sd_remove, 1256 .detect = mmc_sd_detect, 1257 .runtime_suspend = mmc_sd_runtime_suspend, 1258 .runtime_resume = mmc_sd_runtime_resume, 1259 .suspend = mmc_sd_suspend, 1260 .resume = mmc_sd_resume, 1261 .alive = mmc_sd_alive, 1262 .shutdown = mmc_sd_suspend, 1263 .hw_reset = mmc_sd_hw_reset, 1264 }; 1265 1266 /* 1267 * Starting point for SD card init. 1268 */ 1269 int mmc_attach_sd(struct mmc_host *host) 1270 { 1271 int err; 1272 u32 ocr, rocr; 1273 1274 WARN_ON(!host->claimed); 1275 1276 err = mmc_send_app_op_cond(host, 0, &ocr); 1277 if (err) 1278 return err; 1279 1280 mmc_attach_bus(host, &mmc_sd_ops); 1281 if (host->ocr_avail_sd) 1282 host->ocr_avail = host->ocr_avail_sd; 1283 1284 /* 1285 * We need to get OCR a different way for SPI. 1286 */ 1287 if (mmc_host_is_spi(host)) { 1288 mmc_go_idle(host); 1289 1290 err = mmc_spi_read_ocr(host, 0, &ocr); 1291 if (err) 1292 goto err; 1293 } 1294 1295 rocr = mmc_select_voltage(host, ocr); 1296 1297 /* 1298 * Can we support the voltage(s) of the card(s)? 1299 */ 1300 if (!rocr) { 1301 err = -EINVAL; 1302 goto err; 1303 } 1304 1305 /* 1306 * Detect and init the card. 1307 */ 1308 err = mmc_sd_init_card(host, rocr, NULL); 1309 if (err) 1310 goto err; 1311 1312 mmc_release_host(host); 1313 err = mmc_add_card(host->card); 1314 if (err) 1315 goto remove_card; 1316 1317 mmc_claim_host(host); 1318 return 0; 1319 1320 remove_card: 1321 mmc_remove_card(host->card); 1322 host->card = NULL; 1323 mmc_claim_host(host); 1324 err: 1325 mmc_detach_bus(host); 1326 1327 pr_err("%s: error %d whilst initialising SD card\n", 1328 mmc_hostname(host), err); 1329 1330 return err; 1331 } 1332