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 29static const unsigned int tran_exp[] = { 30 10000, 100000, 1000000, 10000000, 31 0, 0, 0, 0 32}; 33 34static 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 39static const unsigned int taac_exp[] = { 40 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 41}; 42 43static 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 48static 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 */ 72void 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 */ 99static 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 } 138 139 if (UNSTUFF_BITS(resp, 13, 1)) 140 mmc_card_set_readonly(card); 141 break; 142 case 1: 143 /* 144 * This is a block-addressed SDHC or SDXC card. Most 145 * interesting fields are unused and have fixed 146 * values. To avoid getting tripped by buggy cards, 147 * we assume those fixed values ourselves. 148 */ 149 mmc_card_set_blockaddr(card); 150 151 csd->taac_ns = 0; /* Unused */ 152 csd->taac_clks = 0; /* Unused */ 153 154 m = UNSTUFF_BITS(resp, 99, 4); 155 e = UNSTUFF_BITS(resp, 96, 3); 156 csd->max_dtr = tran_exp[e] * tran_mant[m]; 157 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 158 csd->c_size = UNSTUFF_BITS(resp, 48, 22); 159 160 /* SDXC cards have a minimum C_SIZE of 0x00FFFF */ 161 if (csd->c_size >= 0xFFFF) 162 mmc_card_set_ext_capacity(card); 163 164 m = UNSTUFF_BITS(resp, 48, 22); 165 csd->capacity = (1 + m) << 10; 166 167 csd->read_blkbits = 9; 168 csd->read_partial = 0; 169 csd->write_misalign = 0; 170 csd->read_misalign = 0; 171 csd->r2w_factor = 4; /* Unused */ 172 csd->write_blkbits = 9; 173 csd->write_partial = 0; 174 csd->erase_size = 1; 175 176 if (UNSTUFF_BITS(resp, 13, 1)) 177 mmc_card_set_readonly(card); 178 break; 179 default: 180 pr_err("%s: unrecognised CSD structure version %d\n", 181 mmc_hostname(card->host), csd_struct); 182 return -EINVAL; 183 } 184 185 card->erase_size = csd->erase_size; 186 187 return 0; 188} 189 190/* 191 * Given a 64-bit response, decode to our card SCR structure. 192 */ 193static int mmc_decode_scr(struct mmc_card *card) 194{ 195 struct sd_scr *scr = &card->scr; 196 unsigned int scr_struct; 197 u32 resp[4]; 198 199 resp[3] = card->raw_scr[1]; 200 resp[2] = card->raw_scr[0]; 201 202 scr_struct = UNSTUFF_BITS(resp, 60, 4); 203 if (scr_struct != 0) { 204 pr_err("%s: unrecognised SCR structure version %d\n", 205 mmc_hostname(card->host), scr_struct); 206 return -EINVAL; 207 } 208 209 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 210 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 211 if (scr->sda_vsn == SCR_SPEC_VER_2) 212 /* Check if Physical Layer Spec v3.0 is supported */ 213 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 214 215 if (scr->sda_spec3) { 216 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1); 217 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4); 218 } 219 220 if (UNSTUFF_BITS(resp, 55, 1)) 221 card->erased_byte = 0xFF; 222 else 223 card->erased_byte = 0x0; 224 225 if (scr->sda_spec3) 226 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 227 228 /* SD Spec says: any SD Card shall set at least bits 0 and 2 */ 229 if (!(scr->bus_widths & SD_SCR_BUS_WIDTH_1) || 230 !(scr->bus_widths & SD_SCR_BUS_WIDTH_4)) { 231 pr_err("%s: invalid bus width\n", mmc_hostname(card->host)); 232 return -EINVAL; 233 } 234 235 return 0; 236} 237 238/* 239 * Fetch and process SD Status register. 240 */ 241static int mmc_read_ssr(struct mmc_card *card) 242{ 243 unsigned int au, es, et, eo; 244 __be32 *raw_ssr; 245 u32 resp[4] = {}; 246 u8 discard_support; 247 int i; 248 249 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 250 pr_warn("%s: card lacks mandatory SD Status function\n", 251 mmc_hostname(card->host)); 252 return 0; 253 } 254 255 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL); 256 if (!raw_ssr) 257 return -ENOMEM; 258 259 if (mmc_app_sd_status(card, raw_ssr)) { 260 pr_warn("%s: problem reading SD Status register\n", 261 mmc_hostname(card->host)); 262 kfree(raw_ssr); 263 return 0; 264 } 265 266 for (i = 0; i < 16; i++) 267 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]); 268 269 kfree(raw_ssr); 270 271 /* 272 * UNSTUFF_BITS only works with four u32s so we have to offset the 273 * bitfield positions accordingly. 274 */ 275 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4); 276 if (au) { 277 if (au <= 9 || card->scr.sda_spec3) { 278 card->ssr.au = sd_au_size[au]; 279 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16); 280 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6); 281 if (es && et) { 282 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2); 283 card->ssr.erase_timeout = (et * 1000) / es; 284 card->ssr.erase_offset = eo * 1000; 285 } 286 } else { 287 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 288 mmc_hostname(card->host)); 289 } 290 } 291 292 /* 293 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set 294 */ 295 resp[3] = card->raw_ssr[6]; 296 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1); 297 card->erase_arg = (card->scr.sda_specx && discard_support) ? 298 SD_DISCARD_ARG : SD_ERASE_ARG; 299 300 return 0; 301} 302 303/* 304 * Fetches and decodes switch information 305 */ 306static int mmc_read_switch(struct mmc_card *card) 307{ 308 int err; 309 u8 *status; 310 311 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 312 return 0; 313 314 if (!(card->csd.cmdclass & CCC_SWITCH)) { 315 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", 316 mmc_hostname(card->host)); 317 return 0; 318 } 319 320 status = kmalloc(64, GFP_KERNEL); 321 if (!status) 322 return -ENOMEM; 323 324 /* 325 * Find out the card's support bits with a mode 0 operation. 326 * The argument does not matter, as the support bits do not 327 * change with the arguments. 328 */ 329 err = mmc_sd_switch(card, 0, 0, 0, status); 330 if (err) { 331 /* 332 * If the host or the card can't do the switch, 333 * fail more gracefully. 334 */ 335 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 336 goto out; 337 338 pr_warn("%s: problem reading Bus Speed modes\n", 339 mmc_hostname(card->host)); 340 err = 0; 341 342 goto out; 343 } 344 345 if (status[13] & SD_MODE_HIGH_SPEED) 346 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 347 348 if (card->scr.sda_spec3) { 349 card->sw_caps.sd3_bus_mode = status[13]; 350 /* Driver Strengths supported by the card */ 351 card->sw_caps.sd3_drv_type = status[9]; 352 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 353 } 354 355out: 356 kfree(status); 357 358 return err; 359} 360 361/* 362 * Test if the card supports high-speed mode and, if so, switch to it. 363 */ 364int mmc_sd_switch_hs(struct mmc_card *card) 365{ 366 int err; 367 u8 *status; 368 369 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 370 return 0; 371 372 if (!(card->csd.cmdclass & CCC_SWITCH)) 373 return 0; 374 375 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 376 return 0; 377 378 if (card->sw_caps.hs_max_dtr == 0) 379 return 0; 380 381 status = kmalloc(64, GFP_KERNEL); 382 if (!status) 383 return -ENOMEM; 384 385 err = mmc_sd_switch(card, 1, 0, HIGH_SPEED_BUS_SPEED, status); 386 if (err) 387 goto out; 388 389 if ((status[16] & 0xF) != HIGH_SPEED_BUS_SPEED) { 390 pr_warn("%s: Problem switching card into high-speed mode!\n", 391 mmc_hostname(card->host)); 392 err = 0; 393 } else { 394 err = 1; 395 } 396 397out: 398 kfree(status); 399 400 return err; 401} 402 403static int sd_select_driver_type(struct mmc_card *card, u8 *status) 404{ 405 int card_drv_type, drive_strength, drv_type; 406 int err; 407 408 card->drive_strength = 0; 409 410 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 411 412 drive_strength = mmc_select_drive_strength(card, 413 card->sw_caps.uhs_max_dtr, 414 card_drv_type, &drv_type); 415 416 if (drive_strength) { 417 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 418 if (err) 419 return err; 420 if ((status[15] & 0xF) != drive_strength) { 421 pr_warn("%s: Problem setting drive strength!\n", 422 mmc_hostname(card->host)); 423 return 0; 424 } 425 card->drive_strength = drive_strength; 426 } 427 428 if (drv_type) 429 mmc_set_driver_type(card->host, drv_type); 430 431 return 0; 432} 433 434static void sd_update_bus_speed_mode(struct mmc_card *card) 435{ 436 /* 437 * If the host doesn't support any of the UHS-I modes, fallback on 438 * default speed. 439 */ 440 if (!mmc_host_uhs(card->host)) { 441 card->sd_bus_speed = 0; 442 return; 443 } 444 445 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 446 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 447 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 448 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 449 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 450 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 451 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 452 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 453 SD_MODE_UHS_SDR50)) { 454 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 455 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 456 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 457 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 458 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 459 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 460 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 461 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 462 SD_MODE_UHS_SDR12)) { 463 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 464 } 465} 466 467static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 468{ 469 int err; 470 unsigned int timing = 0; 471 472 switch (card->sd_bus_speed) { 473 case UHS_SDR104_BUS_SPEED: 474 timing = MMC_TIMING_UHS_SDR104; 475 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 476 break; 477 case UHS_DDR50_BUS_SPEED: 478 timing = MMC_TIMING_UHS_DDR50; 479 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 480 break; 481 case UHS_SDR50_BUS_SPEED: 482 timing = MMC_TIMING_UHS_SDR50; 483 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 484 break; 485 case UHS_SDR25_BUS_SPEED: 486 timing = MMC_TIMING_UHS_SDR25; 487 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 488 break; 489 case UHS_SDR12_BUS_SPEED: 490 timing = MMC_TIMING_UHS_SDR12; 491 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 492 break; 493 default: 494 return 0; 495 } 496 497 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 498 if (err) 499 return err; 500 501 if ((status[16] & 0xF) != card->sd_bus_speed) 502 pr_warn("%s: Problem setting bus speed mode!\n", 503 mmc_hostname(card->host)); 504 else { 505 mmc_set_timing(card->host, timing); 506 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 507 } 508 509 return 0; 510} 511 512/* Get host's max current setting at its current voltage */ 513static u32 sd_get_host_max_current(struct mmc_host *host) 514{ 515 u32 voltage, max_current; 516 517 voltage = 1 << host->ios.vdd; 518 switch (voltage) { 519 case MMC_VDD_165_195: 520 max_current = host->max_current_180; 521 break; 522 case MMC_VDD_29_30: 523 case MMC_VDD_30_31: 524 max_current = host->max_current_300; 525 break; 526 case MMC_VDD_32_33: 527 case MMC_VDD_33_34: 528 max_current = host->max_current_330; 529 break; 530 default: 531 max_current = 0; 532 } 533 534 return max_current; 535} 536 537static int sd_set_current_limit(struct mmc_card *card, u8 *status) 538{ 539 int current_limit = SD_SET_CURRENT_NO_CHANGE; 540 int err; 541 u32 max_current; 542 543 /* 544 * Current limit switch is only defined for SDR50, SDR104, and DDR50 545 * bus speed modes. For other bus speed modes, we do not change the 546 * current limit. 547 */ 548 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 549 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 550 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 551 return 0; 552 553 /* 554 * Host has different current capabilities when operating at 555 * different voltages, so find out its max current first. 556 */ 557 max_current = sd_get_host_max_current(card->host); 558 559 /* 560 * We only check host's capability here, if we set a limit that is 561 * higher than the card's maximum current, the card will be using its 562 * maximum current, e.g. if the card's maximum current is 300ma, and 563 * when we set current limit to 200ma, the card will draw 200ma, and 564 * when we set current limit to 400/600/800ma, the card will draw its 565 * maximum 300ma from the host. 566 * 567 * The above is incorrect: if we try to set a current limit that is 568 * not supported by the card, the card can rightfully error out the 569 * attempt, and remain at the default current limit. This results 570 * in a 300mA card being limited to 200mA even though the host 571 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 572 * an iMX6 host. --rmk 573 */ 574 if (max_current >= 800 && 575 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 576 current_limit = SD_SET_CURRENT_LIMIT_800; 577 else if (max_current >= 600 && 578 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 579 current_limit = SD_SET_CURRENT_LIMIT_600; 580 else if (max_current >= 400 && 581 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 582 current_limit = SD_SET_CURRENT_LIMIT_400; 583 else if (max_current >= 200 && 584 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 585 current_limit = SD_SET_CURRENT_LIMIT_200; 586 587 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 588 err = mmc_sd_switch(card, 1, 3, current_limit, status); 589 if (err) 590 return err; 591 592 if (((status[15] >> 4) & 0x0F) != current_limit) 593 pr_warn("%s: Problem setting current limit!\n", 594 mmc_hostname(card->host)); 595 596 } 597 598 return 0; 599} 600 601/* 602 * UHS-I specific initialization procedure 603 */ 604static int mmc_sd_init_uhs_card(struct mmc_card *card) 605{ 606 int err; 607 u8 *status; 608 609 if (!(card->csd.cmdclass & CCC_SWITCH)) 610 return 0; 611 612 status = kmalloc(64, GFP_KERNEL); 613 if (!status) 614 return -ENOMEM; 615 616 /* Set 4-bit bus width */ 617 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 618 if (err) 619 goto out; 620 621 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 622 623 /* 624 * Select the bus speed mode depending on host 625 * and card capability. 626 */ 627 sd_update_bus_speed_mode(card); 628 629 /* Set the driver strength for the card */ 630 err = sd_select_driver_type(card, status); 631 if (err) 632 goto out; 633 634 /* Set current limit for the card */ 635 err = sd_set_current_limit(card, status); 636 if (err) 637 goto out; 638 639 /* Set bus speed mode of the card */ 640 err = sd_set_bus_speed_mode(card, status); 641 if (err) 642 goto out; 643 644 /* 645 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 646 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 647 */ 648 if (!mmc_host_is_spi(card->host) && 649 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 650 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 651 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 652 err = mmc_execute_tuning(card); 653 654 /* 655 * As SD Specifications Part1 Physical Layer Specification 656 * Version 3.01 says, CMD19 tuning is available for unlocked 657 * cards in transfer state of 1.8V signaling mode. The small 658 * difference between v3.00 and 3.01 spec means that CMD19 659 * tuning is also available for DDR50 mode. 660 */ 661 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 662 pr_warn("%s: ddr50 tuning failed\n", 663 mmc_hostname(card->host)); 664 err = 0; 665 } 666 } 667 668out: 669 kfree(status); 670 671 return err; 672} 673 674MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 675 card->raw_cid[2], card->raw_cid[3]); 676MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 677 card->raw_csd[2], card->raw_csd[3]); 678MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 679MMC_DEV_ATTR(ssr, 680 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", 681 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], 682 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], 683 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], 684 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], 685 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], 686 card->raw_ssr[15]); 687MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 688MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 689MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 690MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 691MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 692MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 693MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 694MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 695MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 696MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 697MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 698 699 700static ssize_t mmc_dsr_show(struct device *dev, 701 struct device_attribute *attr, 702 char *buf) 703{ 704 struct mmc_card *card = mmc_dev_to_card(dev); 705 struct mmc_host *host = card->host; 706 707 if (card->csd.dsr_imp && host->dsr_req) 708 return sprintf(buf, "0x%x\n", host->dsr); 709 else 710 /* return default DSR value */ 711 return sprintf(buf, "0x%x\n", 0x404); 712} 713 714static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); 715 716MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor); 717MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device); 718MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev); 719 720#define sdio_info_attr(num) \ 721static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \ 722{ \ 723 struct mmc_card *card = mmc_dev_to_card(dev); \ 724 \ 725 if (num > card->num_info) \ 726 return -ENODATA; \ 727 if (!card->info[num-1][0]) \ 728 return 0; \ 729 return sprintf(buf, "%s\n", card->info[num-1]); \ 730} \ 731static DEVICE_ATTR_RO(info##num) 732 733sdio_info_attr(1); 734sdio_info_attr(2); 735sdio_info_attr(3); 736sdio_info_attr(4); 737 738static struct attribute *sd_std_attrs[] = { 739 &dev_attr_vendor.attr, 740 &dev_attr_device.attr, 741 &dev_attr_revision.attr, 742 &dev_attr_info1.attr, 743 &dev_attr_info2.attr, 744 &dev_attr_info3.attr, 745 &dev_attr_info4.attr, 746 &dev_attr_cid.attr, 747 &dev_attr_csd.attr, 748 &dev_attr_scr.attr, 749 &dev_attr_ssr.attr, 750 &dev_attr_date.attr, 751 &dev_attr_erase_size.attr, 752 &dev_attr_preferred_erase_size.attr, 753 &dev_attr_fwrev.attr, 754 &dev_attr_hwrev.attr, 755 &dev_attr_manfid.attr, 756 &dev_attr_name.attr, 757 &dev_attr_oemid.attr, 758 &dev_attr_serial.attr, 759 &dev_attr_ocr.attr, 760 &dev_attr_rca.attr, 761 &dev_attr_dsr.attr, 762 NULL, 763}; 764 765static umode_t sd_std_is_visible(struct kobject *kobj, struct attribute *attr, 766 int index) 767{ 768 struct device *dev = kobj_to_dev(kobj); 769 struct mmc_card *card = mmc_dev_to_card(dev); 770 771 /* CIS vendor and device ids, revision and info string are available only for Combo cards */ 772 if ((attr == &dev_attr_vendor.attr || 773 attr == &dev_attr_device.attr || 774 attr == &dev_attr_revision.attr || 775 attr == &dev_attr_info1.attr || 776 attr == &dev_attr_info2.attr || 777 attr == &dev_attr_info3.attr || 778 attr == &dev_attr_info4.attr 779 ) && card->type != MMC_TYPE_SD_COMBO) 780 return 0; 781 782 return attr->mode; 783} 784 785static const struct attribute_group sd_std_group = { 786 .attrs = sd_std_attrs, 787 .is_visible = sd_std_is_visible, 788}; 789__ATTRIBUTE_GROUPS(sd_std); 790 791struct device_type sd_type = { 792 .groups = sd_std_groups, 793}; 794 795/* 796 * Fetch CID from card. 797 */ 798int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 799{ 800 int err; 801 u32 max_current; 802 int retries = 10; 803 u32 pocr = ocr; 804 805try_again: 806 if (!retries) { 807 ocr &= ~SD_OCR_S18R; 808 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 809 } 810 811 /* 812 * Since we're changing the OCR value, we seem to 813 * need to tell some cards to go back to the idle 814 * state. We wait 1ms to give cards time to 815 * respond. 816 */ 817 mmc_go_idle(host); 818 819 /* 820 * If SD_SEND_IF_COND indicates an SD 2.0 821 * compliant card and we should set bit 30 822 * of the ocr to indicate that we can handle 823 * block-addressed SDHC cards. 824 */ 825 err = mmc_send_if_cond(host, ocr); 826 if (!err) 827 ocr |= SD_OCR_CCS; 828 829 /* 830 * If the host supports one of UHS-I modes, request the card 831 * to switch to 1.8V signaling level. If the card has failed 832 * repeatedly to switch however, skip this. 833 */ 834 if (retries && mmc_host_uhs(host)) 835 ocr |= SD_OCR_S18R; 836 837 /* 838 * If the host can supply more than 150mA at current voltage, 839 * XPC should be set to 1. 840 */ 841 max_current = sd_get_host_max_current(host); 842 if (max_current > 150) 843 ocr |= SD_OCR_XPC; 844 845 err = mmc_send_app_op_cond(host, ocr, rocr); 846 if (err) 847 return err; 848 849 /* 850 * In case the S18A bit is set in the response, let's start the signal 851 * voltage switch procedure. SPI mode doesn't support CMD11. 852 * Note that, according to the spec, the S18A bit is not valid unless 853 * the CCS bit is set as well. We deliberately deviate from the spec in 854 * regards to this, which allows UHS-I to be supported for SDSC cards. 855 */ 856 if (!mmc_host_is_spi(host) && (ocr & SD_OCR_S18R) && 857 rocr && (*rocr & SD_ROCR_S18A)) { 858 err = mmc_set_uhs_voltage(host, pocr); 859 if (err == -EAGAIN) { 860 retries--; 861 goto try_again; 862 } else if (err) { 863 retries = 0; 864 goto try_again; 865 } 866 } 867 868 err = mmc_send_cid(host, cid); 869 return err; 870} 871 872int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 873{ 874 int err; 875 876 /* 877 * Fetch CSD from card. 878 */ 879 err = mmc_send_csd(card, card->raw_csd); 880 if (err) 881 return err; 882 883 err = mmc_decode_csd(card); 884 if (err) 885 return err; 886 887 return 0; 888} 889 890static int mmc_sd_get_ro(struct mmc_host *host) 891{ 892 int ro; 893 894 /* 895 * Some systems don't feature a write-protect pin and don't need one. 896 * E.g. because they only have micro-SD card slot. For those systems 897 * assume that the SD card is always read-write. 898 */ 899 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 900 return 0; 901 902 if (!host->ops->get_ro) 903 return -1; 904 905 ro = host->ops->get_ro(host); 906 907 return ro; 908} 909 910int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 911 bool reinit) 912{ 913 int err; 914 915 if (!reinit) { 916 /* 917 * Fetch SCR from card. 918 */ 919 err = mmc_app_send_scr(card); 920 if (err) 921 return err; 922 923 err = mmc_decode_scr(card); 924 if (err) 925 return err; 926 927 /* 928 * Fetch and process SD Status register. 929 */ 930 err = mmc_read_ssr(card); 931 if (err) 932 return err; 933 934 /* Erase init depends on CSD and SSR */ 935 mmc_init_erase(card); 936 } 937 938 /* 939 * Fetch switch information from card. Note, sd3_bus_mode can change if 940 * voltage switch outcome changes, so do this always. 941 */ 942 err = mmc_read_switch(card); 943 if (err) 944 return err; 945 946 /* 947 * For SPI, enable CRC as appropriate. 948 * This CRC enable is located AFTER the reading of the 949 * card registers because some SDHC cards are not able 950 * to provide valid CRCs for non-512-byte blocks. 951 */ 952 if (mmc_host_is_spi(host)) { 953 err = mmc_spi_set_crc(host, use_spi_crc); 954 if (err) 955 return err; 956 } 957 958 /* 959 * Check if read-only switch is active. 960 */ 961 if (!reinit) { 962 int ro = mmc_sd_get_ro(host); 963 964 if (ro < 0) { 965 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 966 mmc_hostname(host)); 967 } else if (ro > 0) { 968 mmc_card_set_readonly(card); 969 } 970 } 971 972 return 0; 973} 974 975unsigned mmc_sd_get_max_clock(struct mmc_card *card) 976{ 977 unsigned max_dtr = (unsigned int)-1; 978 979 if (mmc_card_hs(card)) { 980 if (max_dtr > card->sw_caps.hs_max_dtr) 981 max_dtr = card->sw_caps.hs_max_dtr; 982 } else if (max_dtr > card->csd.max_dtr) { 983 max_dtr = card->csd.max_dtr; 984 } 985 986 return max_dtr; 987} 988 989static bool mmc_sd_card_using_v18(struct mmc_card *card) 990{ 991 /* 992 * According to the SD spec., the Bus Speed Mode (function group 1) bits 993 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus 994 * they can be used to determine if the card has already switched to 995 * 1.8V signaling. 996 */ 997 return card->sw_caps.sd3_bus_mode & 998 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); 999} 1000 1001/* 1002 * Handle the detection and initialisation of a card. 1003 * 1004 * In the case of a resume, "oldcard" will contain the card 1005 * we're trying to reinitialise. 1006 */ 1007static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 1008 struct mmc_card *oldcard) 1009{ 1010 struct mmc_card *card; 1011 int err; 1012 u32 cid[4]; 1013 u32 rocr = 0; 1014 bool v18_fixup_failed = false; 1015 1016 WARN_ON(!host->claimed); 1017retry: 1018 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 1019 if (err) 1020 return err; 1021 1022 if (oldcard) { 1023 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 1024 pr_debug("%s: Perhaps the card was replaced\n", 1025 mmc_hostname(host)); 1026 return -ENOENT; 1027 } 1028 1029 card = oldcard; 1030 } else { 1031 /* 1032 * Allocate card structure. 1033 */ 1034 card = mmc_alloc_card(host, &sd_type); 1035 if (IS_ERR(card)) 1036 return PTR_ERR(card); 1037 1038 card->ocr = ocr; 1039 card->type = MMC_TYPE_SD; 1040 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 1041 } 1042 1043 /* 1044 * Call the optional HC's init_card function to handle quirks. 1045 */ 1046 if (host->ops->init_card) 1047 host->ops->init_card(host, card); 1048 1049 /* 1050 * For native busses: get card RCA and quit open drain mode. 1051 */ 1052 if (!mmc_host_is_spi(host)) { 1053 err = mmc_send_relative_addr(host, &card->rca); 1054 if (err) 1055 goto free_card; 1056 } 1057 1058 if (!oldcard) { 1059 err = mmc_sd_get_csd(host, card); 1060 if (err) 1061 goto free_card; 1062 1063 mmc_decode_cid(card); 1064 } 1065 1066 /* 1067 * handling only for cards supporting DSR and hosts requesting 1068 * DSR configuration 1069 */ 1070 if (card->csd.dsr_imp && host->dsr_req) 1071 mmc_set_dsr(host); 1072 1073 /* 1074 * Select card, as all following commands rely on that. 1075 */ 1076 if (!mmc_host_is_spi(host)) { 1077 err = mmc_select_card(card); 1078 if (err) 1079 goto free_card; 1080 } 1081 1082 err = mmc_sd_setup_card(host, card, oldcard != NULL); 1083 if (err) 1084 goto free_card; 1085 1086 /* 1087 * If the card has not been power cycled, it may still be using 1.8V 1088 * signaling. Detect that situation and try to initialize a UHS-I (1.8V) 1089 * transfer mode. 1090 */ 1091 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && 1092 mmc_sd_card_using_v18(card) && 1093 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { 1094 if (mmc_host_set_uhs_voltage(host) || 1095 mmc_sd_init_uhs_card(card)) { 1096 v18_fixup_failed = true; 1097 mmc_power_cycle(host, ocr); 1098 if (!oldcard) 1099 mmc_remove_card(card); 1100 goto retry; 1101 } 1102 goto cont; 1103 } 1104 1105 /* Initialization sequence for UHS-I cards */ 1106 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { 1107 err = mmc_sd_init_uhs_card(card); 1108 if (err) 1109 goto free_card; 1110 } else { 1111 /* 1112 * Attempt to change to high-speed (if supported) 1113 */ 1114 err = mmc_sd_switch_hs(card); 1115 if (err > 0) 1116 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1117 else if (err) 1118 goto free_card; 1119 1120 /* 1121 * Set bus speed. 1122 */ 1123 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1124 1125 /* 1126 * Switch to wider bus (if supported). 1127 */ 1128 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1129 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1130 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1131 if (err) 1132 goto free_card; 1133 1134 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1135 } 1136 } 1137cont: 1138 if (host->cqe_ops && !host->cqe_enabled) { 1139 err = host->cqe_ops->cqe_enable(host, card); 1140 if (!err) { 1141 host->cqe_enabled = true; 1142 host->hsq_enabled = true; 1143 pr_info("%s: Host Software Queue enabled\n", 1144 mmc_hostname(host)); 1145 } 1146 } 1147 1148 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 1149 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 1150 pr_err("%s: Host failed to negotiate down from 3.3V\n", 1151 mmc_hostname(host)); 1152 err = -EINVAL; 1153 goto free_card; 1154 } 1155 1156 host->card = card; 1157 return 0; 1158 1159free_card: 1160 if (!oldcard) 1161 mmc_remove_card(card); 1162 1163 return err; 1164} 1165 1166/* 1167 * Host is being removed. Free up the current card. 1168 */ 1169static void mmc_sd_remove(struct mmc_host *host) 1170{ 1171 mmc_remove_card(host->card); 1172 host->card = NULL; 1173} 1174 1175/* 1176 * Card detection - card is alive. 1177 */ 1178static int mmc_sd_alive(struct mmc_host *host) 1179{ 1180 return mmc_send_status(host->card, NULL); 1181} 1182 1183/* 1184 * Card detection callback from host. 1185 */ 1186static void mmc_sd_detect(struct mmc_host *host) 1187{ 1188 int err; 1189 1190 mmc_get_card(host->card, NULL); 1191 1192 /* 1193 * Just check if our card has been removed. 1194 */ 1195 err = _mmc_detect_card_removed(host); 1196 1197 mmc_put_card(host->card, NULL); 1198 1199 if (err) { 1200 mmc_sd_remove(host); 1201 1202 mmc_claim_host(host); 1203 mmc_detach_bus(host); 1204 mmc_power_off(host); 1205 mmc_release_host(host); 1206 } 1207} 1208 1209static int _mmc_sd_suspend(struct mmc_host *host) 1210{ 1211 int err = 0; 1212 1213 mmc_claim_host(host); 1214 1215 if (mmc_card_suspended(host->card)) 1216 goto out; 1217 1218 if (!mmc_host_is_spi(host)) 1219 err = mmc_deselect_cards(host); 1220 1221 if (!err) { 1222 mmc_power_off(host); 1223 mmc_card_set_suspended(host->card); 1224 } 1225 1226out: 1227 mmc_release_host(host); 1228 return err; 1229} 1230 1231/* 1232 * Callback for suspend 1233 */ 1234static int mmc_sd_suspend(struct mmc_host *host) 1235{ 1236 int err; 1237 1238 err = _mmc_sd_suspend(host); 1239 if (!err) { 1240 pm_runtime_disable(&host->card->dev); 1241 pm_runtime_set_suspended(&host->card->dev); 1242 } 1243 1244 return err; 1245} 1246 1247/* 1248 * This function tries to determine if the same card is still present 1249 * and, if so, restore all state to it. 1250 */ 1251static int _mmc_sd_resume(struct mmc_host *host) 1252{ 1253 int err = 0; 1254 1255 mmc_claim_host(host); 1256 1257 if (!mmc_card_suspended(host->card)) 1258 goto out; 1259 1260 mmc_power_up(host, host->card->ocr); 1261 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1262 mmc_card_clr_suspended(host->card); 1263 1264out: 1265 mmc_release_host(host); 1266 return err; 1267} 1268 1269/* 1270 * Callback for resume 1271 */ 1272static int mmc_sd_resume(struct mmc_host *host) 1273{ 1274 pm_runtime_enable(&host->card->dev); 1275 return 0; 1276} 1277 1278/* 1279 * Callback for runtime_suspend. 1280 */ 1281static int mmc_sd_runtime_suspend(struct mmc_host *host) 1282{ 1283 int err; 1284 1285 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1286 return 0; 1287 1288 err = _mmc_sd_suspend(host); 1289 if (err) 1290 pr_err("%s: error %d doing aggressive suspend\n", 1291 mmc_hostname(host), err); 1292 1293 return err; 1294} 1295 1296/* 1297 * Callback for runtime_resume. 1298 */ 1299static int mmc_sd_runtime_resume(struct mmc_host *host) 1300{ 1301 int err; 1302 1303 err = _mmc_sd_resume(host); 1304 if (err && err != -ENOMEDIUM) 1305 pr_err("%s: error %d doing runtime resume\n", 1306 mmc_hostname(host), err); 1307 1308 return 0; 1309} 1310 1311static int mmc_sd_hw_reset(struct mmc_host *host) 1312{ 1313 mmc_power_cycle(host, host->card->ocr); 1314 return mmc_sd_init_card(host, host->card->ocr, host->card); 1315} 1316 1317static const struct mmc_bus_ops mmc_sd_ops = { 1318 .remove = mmc_sd_remove, 1319 .detect = mmc_sd_detect, 1320 .runtime_suspend = mmc_sd_runtime_suspend, 1321 .runtime_resume = mmc_sd_runtime_resume, 1322 .suspend = mmc_sd_suspend, 1323 .resume = mmc_sd_resume, 1324 .alive = mmc_sd_alive, 1325 .shutdown = mmc_sd_suspend, 1326 .hw_reset = mmc_sd_hw_reset, 1327}; 1328 1329/* 1330 * Starting point for SD card init. 1331 */ 1332int mmc_attach_sd(struct mmc_host *host) 1333{ 1334 int err; 1335 u32 ocr, rocr; 1336 1337 WARN_ON(!host->claimed); 1338 1339 err = mmc_send_app_op_cond(host, 0, &ocr); 1340 if (err) 1341 return err; 1342 1343 mmc_attach_bus(host, &mmc_sd_ops); 1344 if (host->ocr_avail_sd) 1345 host->ocr_avail = host->ocr_avail_sd; 1346 1347 /* 1348 * We need to get OCR a different way for SPI. 1349 */ 1350 if (mmc_host_is_spi(host)) { 1351 mmc_go_idle(host); 1352 1353 err = mmc_spi_read_ocr(host, 0, &ocr); 1354 if (err) 1355 goto err; 1356 } 1357 1358 /* 1359 * Some SD cards claims an out of spec VDD voltage range. Let's treat 1360 * these bits as being in-valid and especially also bit7. 1361 */ 1362 ocr &= ~0x7FFF; 1363 1364 rocr = mmc_select_voltage(host, ocr); 1365 1366 /* 1367 * Can we support the voltage(s) of the card(s)? 1368 */ 1369 if (!rocr) { 1370 err = -EINVAL; 1371 goto err; 1372 } 1373 1374 /* 1375 * Detect and init the card. 1376 */ 1377 err = mmc_sd_init_card(host, rocr, NULL); 1378 if (err) 1379 goto err; 1380 1381 mmc_release_host(host); 1382 err = mmc_add_card(host->card); 1383 if (err) 1384 goto remove_card; 1385 1386 mmc_claim_host(host); 1387 return 0; 1388 1389remove_card: 1390 mmc_remove_card(host->card); 1391 host->card = NULL; 1392 mmc_claim_host(host); 1393err: 1394 mmc_detach_bus(host); 1395 1396 pr_err("%s: error %d whilst initialising SD card\n", 1397 mmc_hostname(host), err); 1398 1399 return err; 1400} 1401