1 /* 2 * linux/drivers/mmc/core/sd.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved. 6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/sizes.h> 15 #include <linux/slab.h> 16 #include <linux/stat.h> 17 #include <linux/pm_runtime.h> 18 19 #include <linux/mmc/host.h> 20 #include <linux/mmc/card.h> 21 #include <linux/mmc/mmc.h> 22 #include <linux/mmc/sd.h> 23 24 #include "core.h" 25 #include "card.h" 26 #include "host.h" 27 #include "bus.h" 28 #include "mmc_ops.h" 29 #include "sd.h" 30 #include "sd_ops.h" 31 32 static const unsigned int tran_exp[] = { 33 10000, 100000, 1000000, 10000000, 34 0, 0, 0, 0 35 }; 36 37 static const unsigned char tran_mant[] = { 38 0, 10, 12, 13, 15, 20, 25, 30, 39 35, 40, 45, 50, 55, 60, 70, 80, 40 }; 41 42 static const unsigned int taac_exp[] = { 43 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 44 }; 45 46 static const unsigned int taac_mant[] = { 47 0, 10, 12, 13, 15, 20, 25, 30, 48 35, 40, 45, 50, 55, 60, 70, 80, 49 }; 50 51 static const unsigned int sd_au_size[] = { 52 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, 53 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, 54 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, 55 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, 56 }; 57 58 #define UNSTUFF_BITS(resp,start,size) \ 59 ({ \ 60 const int __size = size; \ 61 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 62 const int __off = 3 - ((start) / 32); \ 63 const int __shft = (start) & 31; \ 64 u32 __res; \ 65 \ 66 __res = resp[__off] >> __shft; \ 67 if (__size + __shft > 32) \ 68 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 69 __res & __mask; \ 70 }) 71 72 /* 73 * Given the decoded CSD structure, decode the raw CID to our CID structure. 74 */ 75 void mmc_decode_cid(struct mmc_card *card) 76 { 77 u32 *resp = card->raw_cid; 78 79 /* 80 * SD doesn't currently have a version field so we will 81 * have to assume we can parse this. 82 */ 83 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 84 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 85 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 86 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 87 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 88 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 89 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 90 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 91 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 92 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 93 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 94 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 95 96 card->cid.year += 2000; /* SD cards year offset */ 97 } 98 99 /* 100 * Given a 128-bit response, decode to our card CSD structure. 101 */ 102 static int mmc_decode_csd(struct mmc_card *card) 103 { 104 struct mmc_csd *csd = &card->csd; 105 unsigned int e, m, csd_struct; 106 u32 *resp = card->raw_csd; 107 108 csd_struct = UNSTUFF_BITS(resp, 126, 2); 109 110 switch (csd_struct) { 111 case 0: 112 m = UNSTUFF_BITS(resp, 115, 4); 113 e = UNSTUFF_BITS(resp, 112, 3); 114 csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10; 115 csd->taac_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 116 117 m = UNSTUFF_BITS(resp, 99, 4); 118 e = UNSTUFF_BITS(resp, 96, 3); 119 csd->max_dtr = tran_exp[e] * tran_mant[m]; 120 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 121 122 e = UNSTUFF_BITS(resp, 47, 3); 123 m = UNSTUFF_BITS(resp, 62, 12); 124 csd->capacity = (1 + m) << (e + 2); 125 126 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 127 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 128 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 129 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 130 csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1); 131 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 132 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 133 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 134 135 if (UNSTUFF_BITS(resp, 46, 1)) { 136 csd->erase_size = 1; 137 } else if (csd->write_blkbits >= 9) { 138 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 139 csd->erase_size <<= csd->write_blkbits - 9; 140 } 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 break; 176 default: 177 pr_err("%s: unrecognised CSD structure version %d\n", 178 mmc_hostname(card->host), csd_struct); 179 return -EINVAL; 180 } 181 182 card->erase_size = csd->erase_size; 183 184 return 0; 185 } 186 187 /* 188 * Given a 64-bit response, decode to our card SCR structure. 189 */ 190 static int mmc_decode_scr(struct mmc_card *card) 191 { 192 struct sd_scr *scr = &card->scr; 193 unsigned int scr_struct; 194 u32 resp[4]; 195 196 resp[3] = card->raw_scr[1]; 197 resp[2] = card->raw_scr[0]; 198 199 scr_struct = UNSTUFF_BITS(resp, 60, 4); 200 if (scr_struct != 0) { 201 pr_err("%s: unrecognised SCR structure version %d\n", 202 mmc_hostname(card->host), scr_struct); 203 return -EINVAL; 204 } 205 206 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 207 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 208 if (scr->sda_vsn == SCR_SPEC_VER_2) 209 /* Check if Physical Layer Spec v3.0 is supported */ 210 scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1); 211 212 if (scr->sda_spec3) { 213 scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1); 214 scr->sda_specx = UNSTUFF_BITS(resp, 38, 4); 215 } 216 217 if (UNSTUFF_BITS(resp, 55, 1)) 218 card->erased_byte = 0xFF; 219 else 220 card->erased_byte = 0x0; 221 222 if (scr->sda_spec3) 223 scr->cmds = UNSTUFF_BITS(resp, 32, 2); 224 return 0; 225 } 226 227 /* 228 * Fetch and process SD Status register. 229 */ 230 static int mmc_read_ssr(struct mmc_card *card) 231 { 232 unsigned int au, es, et, eo; 233 __be32 *raw_ssr; 234 u32 resp[4] = {}; 235 u8 discard_support; 236 int i; 237 238 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 239 pr_warn("%s: card lacks mandatory SD Status function\n", 240 mmc_hostname(card->host)); 241 return 0; 242 } 243 244 raw_ssr = kmalloc(sizeof(card->raw_ssr), GFP_KERNEL); 245 if (!raw_ssr) 246 return -ENOMEM; 247 248 if (mmc_app_sd_status(card, raw_ssr)) { 249 pr_warn("%s: problem reading SD Status register\n", 250 mmc_hostname(card->host)); 251 kfree(raw_ssr); 252 return 0; 253 } 254 255 for (i = 0; i < 16; i++) 256 card->raw_ssr[i] = be32_to_cpu(raw_ssr[i]); 257 258 kfree(raw_ssr); 259 260 /* 261 * UNSTUFF_BITS only works with four u32s so we have to offset the 262 * bitfield positions accordingly. 263 */ 264 au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4); 265 if (au) { 266 if (au <= 9 || card->scr.sda_spec3) { 267 card->ssr.au = sd_au_size[au]; 268 es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16); 269 et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6); 270 if (es && et) { 271 eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2); 272 card->ssr.erase_timeout = (et * 1000) / es; 273 card->ssr.erase_offset = eo * 1000; 274 } 275 } else { 276 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 277 mmc_hostname(card->host)); 278 } 279 } 280 281 /* 282 * starting SD5.1 discard is supported if DISCARD_SUPPORT (b313) is set 283 */ 284 resp[3] = card->raw_ssr[6]; 285 discard_support = UNSTUFF_BITS(resp, 313 - 288, 1); 286 card->erase_arg = (card->scr.sda_specx && discard_support) ? 287 SD_DISCARD_ARG : SD_ERASE_ARG; 288 289 return 0; 290 } 291 292 /* 293 * Fetches and decodes switch information 294 */ 295 static int mmc_read_switch(struct mmc_card *card) 296 { 297 int err; 298 u8 *status; 299 300 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 301 return 0; 302 303 if (!(card->csd.cmdclass & CCC_SWITCH)) { 304 pr_warn("%s: card lacks mandatory switch function, performance might suffer\n", 305 mmc_hostname(card->host)); 306 return 0; 307 } 308 309 status = kmalloc(64, GFP_KERNEL); 310 if (!status) 311 return -ENOMEM; 312 313 /* 314 * Find out the card's support bits with a mode 0 operation. 315 * The argument does not matter, as the support bits do not 316 * change with the arguments. 317 */ 318 err = mmc_sd_switch(card, 0, 0, 0, status); 319 if (err) { 320 /* 321 * If the host or the card can't do the switch, 322 * fail more gracefully. 323 */ 324 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 325 goto out; 326 327 pr_warn("%s: problem reading Bus Speed modes\n", 328 mmc_hostname(card->host)); 329 err = 0; 330 331 goto out; 332 } 333 334 if (status[13] & SD_MODE_HIGH_SPEED) 335 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 336 337 if (card->scr.sda_spec3) { 338 card->sw_caps.sd3_bus_mode = status[13]; 339 /* Driver Strengths supported by the card */ 340 card->sw_caps.sd3_drv_type = status[9]; 341 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 342 } 343 344 out: 345 kfree(status); 346 347 return err; 348 } 349 350 /* 351 * Test if the card supports high-speed mode and, if so, switch to it. 352 */ 353 int mmc_sd_switch_hs(struct mmc_card *card) 354 { 355 int err; 356 u8 *status; 357 358 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 359 return 0; 360 361 if (!(card->csd.cmdclass & CCC_SWITCH)) 362 return 0; 363 364 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 365 return 0; 366 367 if (card->sw_caps.hs_max_dtr == 0) 368 return 0; 369 370 status = kmalloc(64, GFP_KERNEL); 371 if (!status) 372 return -ENOMEM; 373 374 err = mmc_sd_switch(card, 1, 0, 1, status); 375 if (err) 376 goto out; 377 378 if ((status[16] & 0xF) != 1) { 379 pr_warn("%s: Problem switching card into high-speed mode!\n", 380 mmc_hostname(card->host)); 381 err = 0; 382 } else { 383 err = 1; 384 } 385 386 out: 387 kfree(status); 388 389 return err; 390 } 391 392 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 393 { 394 int card_drv_type, drive_strength, drv_type; 395 int err; 396 397 card->drive_strength = 0; 398 399 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 400 401 drive_strength = mmc_select_drive_strength(card, 402 card->sw_caps.uhs_max_dtr, 403 card_drv_type, &drv_type); 404 405 if (drive_strength) { 406 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 407 if (err) 408 return err; 409 if ((status[15] & 0xF) != drive_strength) { 410 pr_warn("%s: Problem setting drive strength!\n", 411 mmc_hostname(card->host)); 412 return 0; 413 } 414 card->drive_strength = drive_strength; 415 } 416 417 if (drv_type) 418 mmc_set_driver_type(card->host, drv_type); 419 420 return 0; 421 } 422 423 static void sd_update_bus_speed_mode(struct mmc_card *card) 424 { 425 /* 426 * If the host doesn't support any of the UHS-I modes, fallback on 427 * default speed. 428 */ 429 if (!mmc_host_uhs(card->host)) { 430 card->sd_bus_speed = 0; 431 return; 432 } 433 434 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 435 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 436 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 437 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 438 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 439 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 440 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 441 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 442 SD_MODE_UHS_SDR50)) { 443 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 444 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 445 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 446 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 447 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 448 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 449 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 450 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 451 SD_MODE_UHS_SDR12)) { 452 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 453 } 454 } 455 456 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 457 { 458 int err; 459 unsigned int timing = 0; 460 461 switch (card->sd_bus_speed) { 462 case UHS_SDR104_BUS_SPEED: 463 timing = MMC_TIMING_UHS_SDR104; 464 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 465 break; 466 case UHS_DDR50_BUS_SPEED: 467 timing = MMC_TIMING_UHS_DDR50; 468 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 469 break; 470 case UHS_SDR50_BUS_SPEED: 471 timing = MMC_TIMING_UHS_SDR50; 472 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 473 break; 474 case UHS_SDR25_BUS_SPEED: 475 timing = MMC_TIMING_UHS_SDR25; 476 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 477 break; 478 case UHS_SDR12_BUS_SPEED: 479 timing = MMC_TIMING_UHS_SDR12; 480 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 481 break; 482 default: 483 return 0; 484 } 485 486 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 487 if (err) 488 return err; 489 490 if ((status[16] & 0xF) != card->sd_bus_speed) 491 pr_warn("%s: Problem setting bus speed mode!\n", 492 mmc_hostname(card->host)); 493 else { 494 mmc_set_timing(card->host, timing); 495 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 496 } 497 498 return 0; 499 } 500 501 /* Get host's max current setting at its current voltage */ 502 static u32 sd_get_host_max_current(struct mmc_host *host) 503 { 504 u32 voltage, max_current; 505 506 voltage = 1 << host->ios.vdd; 507 switch (voltage) { 508 case MMC_VDD_165_195: 509 max_current = host->max_current_180; 510 break; 511 case MMC_VDD_29_30: 512 case MMC_VDD_30_31: 513 max_current = host->max_current_300; 514 break; 515 case MMC_VDD_32_33: 516 case MMC_VDD_33_34: 517 max_current = host->max_current_330; 518 break; 519 default: 520 max_current = 0; 521 } 522 523 return max_current; 524 } 525 526 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 527 { 528 int current_limit = SD_SET_CURRENT_NO_CHANGE; 529 int err; 530 u32 max_current; 531 532 /* 533 * Current limit switch is only defined for SDR50, SDR104, and DDR50 534 * bus speed modes. For other bus speed modes, we do not change the 535 * current limit. 536 */ 537 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 538 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 539 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 540 return 0; 541 542 /* 543 * Host has different current capabilities when operating at 544 * different voltages, so find out its max current first. 545 */ 546 max_current = sd_get_host_max_current(card->host); 547 548 /* 549 * We only check host's capability here, if we set a limit that is 550 * higher than the card's maximum current, the card will be using its 551 * maximum current, e.g. if the card's maximum current is 300ma, and 552 * when we set current limit to 200ma, the card will draw 200ma, and 553 * when we set current limit to 400/600/800ma, the card will draw its 554 * maximum 300ma from the host. 555 * 556 * The above is incorrect: if we try to set a current limit that is 557 * not supported by the card, the card can rightfully error out the 558 * attempt, and remain at the default current limit. This results 559 * in a 300mA card being limited to 200mA even though the host 560 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 561 * an iMX6 host. --rmk 562 */ 563 if (max_current >= 800 && 564 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 565 current_limit = SD_SET_CURRENT_LIMIT_800; 566 else if (max_current >= 600 && 567 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 568 current_limit = SD_SET_CURRENT_LIMIT_600; 569 else if (max_current >= 400 && 570 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 571 current_limit = SD_SET_CURRENT_LIMIT_400; 572 else if (max_current >= 200 && 573 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 574 current_limit = SD_SET_CURRENT_LIMIT_200; 575 576 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 577 err = mmc_sd_switch(card, 1, 3, current_limit, status); 578 if (err) 579 return err; 580 581 if (((status[15] >> 4) & 0x0F) != current_limit) 582 pr_warn("%s: Problem setting current limit!\n", 583 mmc_hostname(card->host)); 584 585 } 586 587 return 0; 588 } 589 590 /* 591 * UHS-I specific initialization procedure 592 */ 593 static int mmc_sd_init_uhs_card(struct mmc_card *card) 594 { 595 int err; 596 u8 *status; 597 598 if (!(card->csd.cmdclass & CCC_SWITCH)) 599 return 0; 600 601 status = kmalloc(64, GFP_KERNEL); 602 if (!status) 603 return -ENOMEM; 604 605 /* Set 4-bit bus width */ 606 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 607 if (err) 608 goto out; 609 610 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 611 612 /* 613 * Select the bus speed mode depending on host 614 * and card capability. 615 */ 616 sd_update_bus_speed_mode(card); 617 618 /* Set the driver strength for the card */ 619 err = sd_select_driver_type(card, status); 620 if (err) 621 goto out; 622 623 /* Set current limit for the card */ 624 err = sd_set_current_limit(card, status); 625 if (err) 626 goto out; 627 628 /* Set bus speed mode of the card */ 629 err = sd_set_bus_speed_mode(card, status); 630 if (err) 631 goto out; 632 633 /* 634 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 635 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 636 */ 637 if (!mmc_host_is_spi(card->host) && 638 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 639 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 640 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 641 err = mmc_execute_tuning(card); 642 643 /* 644 * As SD Specifications Part1 Physical Layer Specification 645 * Version 3.01 says, CMD19 tuning is available for unlocked 646 * cards in transfer state of 1.8V signaling mode. The small 647 * difference between v3.00 and 3.01 spec means that CMD19 648 * tuning is also available for DDR50 mode. 649 */ 650 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 651 pr_warn("%s: ddr50 tuning failed\n", 652 mmc_hostname(card->host)); 653 err = 0; 654 } 655 } 656 657 out: 658 kfree(status); 659 660 return err; 661 } 662 663 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 664 card->raw_cid[2], card->raw_cid[3]); 665 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 666 card->raw_csd[2], card->raw_csd[3]); 667 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 668 MMC_DEV_ATTR(ssr, 669 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", 670 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], 671 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], 672 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], 673 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], 674 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], 675 card->raw_ssr[15]); 676 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 677 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 678 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 679 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 680 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 681 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 682 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 683 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 684 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 685 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr); 686 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca); 687 688 689 static ssize_t mmc_dsr_show(struct device *dev, 690 struct device_attribute *attr, 691 char *buf) 692 { 693 struct mmc_card *card = mmc_dev_to_card(dev); 694 struct mmc_host *host = card->host; 695 696 if (card->csd.dsr_imp && host->dsr_req) 697 return sprintf(buf, "0x%x\n", host->dsr); 698 else 699 /* return default DSR value */ 700 return sprintf(buf, "0x%x\n", 0x404); 701 } 702 703 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); 704 705 static struct attribute *sd_std_attrs[] = { 706 &dev_attr_cid.attr, 707 &dev_attr_csd.attr, 708 &dev_attr_scr.attr, 709 &dev_attr_ssr.attr, 710 &dev_attr_date.attr, 711 &dev_attr_erase_size.attr, 712 &dev_attr_preferred_erase_size.attr, 713 &dev_attr_fwrev.attr, 714 &dev_attr_hwrev.attr, 715 &dev_attr_manfid.attr, 716 &dev_attr_name.attr, 717 &dev_attr_oemid.attr, 718 &dev_attr_serial.attr, 719 &dev_attr_ocr.attr, 720 &dev_attr_rca.attr, 721 &dev_attr_dsr.attr, 722 NULL, 723 }; 724 ATTRIBUTE_GROUPS(sd_std); 725 726 struct device_type sd_type = { 727 .groups = sd_std_groups, 728 }; 729 730 /* 731 * Fetch CID from card. 732 */ 733 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 734 { 735 int err; 736 u32 max_current; 737 int retries = 10; 738 u32 pocr = ocr; 739 740 try_again: 741 if (!retries) { 742 ocr &= ~SD_OCR_S18R; 743 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 744 } 745 746 /* 747 * Since we're changing the OCR value, we seem to 748 * need to tell some cards to go back to the idle 749 * state. We wait 1ms to give cards time to 750 * respond. 751 */ 752 mmc_go_idle(host); 753 754 /* 755 * If SD_SEND_IF_COND indicates an SD 2.0 756 * compliant card and we should set bit 30 757 * of the ocr to indicate that we can handle 758 * block-addressed SDHC cards. 759 */ 760 err = mmc_send_if_cond(host, ocr); 761 if (!err) 762 ocr |= SD_OCR_CCS; 763 764 /* 765 * If the host supports one of UHS-I modes, request the card 766 * to switch to 1.8V signaling level. If the card has failed 767 * repeatedly to switch however, skip this. 768 */ 769 if (retries && mmc_host_uhs(host)) 770 ocr |= SD_OCR_S18R; 771 772 /* 773 * If the host can supply more than 150mA at current voltage, 774 * XPC should be set to 1. 775 */ 776 max_current = sd_get_host_max_current(host); 777 if (max_current > 150) 778 ocr |= SD_OCR_XPC; 779 780 err = mmc_send_app_op_cond(host, ocr, rocr); 781 if (err) 782 return err; 783 784 /* 785 * In case CCS and S18A in the response is set, start Signal Voltage 786 * Switch procedure. SPI mode doesn't support CMD11. 787 */ 788 if (!mmc_host_is_spi(host) && rocr && 789 ((*rocr & 0x41000000) == 0x41000000)) { 790 err = mmc_set_uhs_voltage(host, pocr); 791 if (err == -EAGAIN) { 792 retries--; 793 goto try_again; 794 } else if (err) { 795 retries = 0; 796 goto try_again; 797 } 798 } 799 800 err = mmc_send_cid(host, cid); 801 return err; 802 } 803 804 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 805 { 806 int err; 807 808 /* 809 * Fetch CSD from card. 810 */ 811 err = mmc_send_csd(card, card->raw_csd); 812 if (err) 813 return err; 814 815 err = mmc_decode_csd(card); 816 if (err) 817 return err; 818 819 return 0; 820 } 821 822 static int mmc_sd_get_ro(struct mmc_host *host) 823 { 824 int ro; 825 826 /* 827 * Some systems don't feature a write-protect pin and don't need one. 828 * E.g. because they only have micro-SD card slot. For those systems 829 * assume that the SD card is always read-write. 830 */ 831 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 832 return 0; 833 834 if (!host->ops->get_ro) 835 return -1; 836 837 ro = host->ops->get_ro(host); 838 839 return ro; 840 } 841 842 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 843 bool reinit) 844 { 845 int err; 846 847 if (!reinit) { 848 /* 849 * Fetch SCR from card. 850 */ 851 err = mmc_app_send_scr(card); 852 if (err) 853 return err; 854 855 err = mmc_decode_scr(card); 856 if (err) 857 return err; 858 859 /* 860 * Fetch and process SD Status register. 861 */ 862 err = mmc_read_ssr(card); 863 if (err) 864 return err; 865 866 /* Erase init depends on CSD and SSR */ 867 mmc_init_erase(card); 868 869 /* 870 * Fetch switch information from card. 871 */ 872 err = mmc_read_switch(card); 873 if (err) 874 return err; 875 } 876 877 /* 878 * For SPI, enable CRC as appropriate. 879 * This CRC enable is located AFTER the reading of the 880 * card registers because some SDHC cards are not able 881 * to provide valid CRCs for non-512-byte blocks. 882 */ 883 if (mmc_host_is_spi(host)) { 884 err = mmc_spi_set_crc(host, use_spi_crc); 885 if (err) 886 return err; 887 } 888 889 /* 890 * Check if read-only switch is active. 891 */ 892 if (!reinit) { 893 int ro = mmc_sd_get_ro(host); 894 895 if (ro < 0) { 896 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 897 mmc_hostname(host)); 898 } else if (ro > 0) { 899 mmc_card_set_readonly(card); 900 } 901 } 902 903 return 0; 904 } 905 906 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 907 { 908 unsigned max_dtr = (unsigned int)-1; 909 910 if (mmc_card_hs(card)) { 911 if (max_dtr > card->sw_caps.hs_max_dtr) 912 max_dtr = card->sw_caps.hs_max_dtr; 913 } else if (max_dtr > card->csd.max_dtr) { 914 max_dtr = card->csd.max_dtr; 915 } 916 917 return max_dtr; 918 } 919 920 static bool mmc_sd_card_using_v18(struct mmc_card *card) 921 { 922 /* 923 * According to the SD spec., the Bus Speed Mode (function group 1) bits 924 * 2 to 4 are zero if the card is initialized at 3.3V signal level. Thus 925 * they can be used to determine if the card has already switched to 926 * 1.8V signaling. 927 */ 928 return card->sw_caps.sd3_bus_mode & 929 (SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR104 | SD_MODE_UHS_DDR50); 930 } 931 932 /* 933 * Handle the detection and initialisation of a card. 934 * 935 * In the case of a resume, "oldcard" will contain the card 936 * we're trying to reinitialise. 937 */ 938 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 939 struct mmc_card *oldcard) 940 { 941 struct mmc_card *card; 942 int err; 943 u32 cid[4]; 944 u32 rocr = 0; 945 bool v18_fixup_failed = false; 946 947 WARN_ON(!host->claimed); 948 retry: 949 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 950 if (err) 951 return err; 952 953 if (oldcard) { 954 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 955 pr_debug("%s: Perhaps the card was replaced\n", 956 mmc_hostname(host)); 957 return -ENOENT; 958 } 959 960 card = oldcard; 961 } else { 962 /* 963 * Allocate card structure. 964 */ 965 card = mmc_alloc_card(host, &sd_type); 966 if (IS_ERR(card)) 967 return PTR_ERR(card); 968 969 card->ocr = ocr; 970 card->type = MMC_TYPE_SD; 971 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 972 } 973 974 /* 975 * Call the optional HC's init_card function to handle quirks. 976 */ 977 if (host->ops->init_card) 978 host->ops->init_card(host, card); 979 980 /* 981 * For native busses: get card RCA and quit open drain mode. 982 */ 983 if (!mmc_host_is_spi(host)) { 984 err = mmc_send_relative_addr(host, &card->rca); 985 if (err) 986 goto free_card; 987 } 988 989 if (!oldcard) { 990 err = mmc_sd_get_csd(host, card); 991 if (err) 992 goto free_card; 993 994 mmc_decode_cid(card); 995 } 996 997 /* 998 * handling only for cards supporting DSR and hosts requesting 999 * DSR configuration 1000 */ 1001 if (card->csd.dsr_imp && host->dsr_req) 1002 mmc_set_dsr(host); 1003 1004 /* 1005 * Select card, as all following commands rely on that. 1006 */ 1007 if (!mmc_host_is_spi(host)) { 1008 err = mmc_select_card(card); 1009 if (err) 1010 goto free_card; 1011 } 1012 1013 err = mmc_sd_setup_card(host, card, oldcard != NULL); 1014 if (err) 1015 goto free_card; 1016 1017 /* 1018 * If the card has not been power cycled, it may still be using 1.8V 1019 * signaling. Detect that situation and try to initialize a UHS-I (1.8V) 1020 * transfer mode. 1021 */ 1022 if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) && 1023 mmc_sd_card_using_v18(card) && 1024 host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) { 1025 /* 1026 * Re-read switch information in case it has changed since 1027 * oldcard was initialized. 1028 */ 1029 if (oldcard) { 1030 err = mmc_read_switch(card); 1031 if (err) 1032 goto free_card; 1033 } 1034 if (mmc_sd_card_using_v18(card)) { 1035 if (mmc_host_set_uhs_voltage(host) || 1036 mmc_sd_init_uhs_card(card)) { 1037 v18_fixup_failed = true; 1038 mmc_power_cycle(host, ocr); 1039 if (!oldcard) 1040 mmc_remove_card(card); 1041 goto retry; 1042 } 1043 goto done; 1044 } 1045 } 1046 1047 /* Initialization sequence for UHS-I cards */ 1048 if (rocr & SD_ROCR_S18A && mmc_host_uhs(host)) { 1049 err = mmc_sd_init_uhs_card(card); 1050 if (err) 1051 goto free_card; 1052 } else { 1053 /* 1054 * Attempt to change to high-speed (if supported) 1055 */ 1056 err = mmc_sd_switch_hs(card); 1057 if (err > 0) 1058 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1059 else if (err) 1060 goto free_card; 1061 1062 /* 1063 * Set bus speed. 1064 */ 1065 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1066 1067 /* 1068 * Switch to wider bus (if supported). 1069 */ 1070 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1071 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1072 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1073 if (err) 1074 goto free_card; 1075 1076 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1077 } 1078 } 1079 1080 if (host->caps2 & MMC_CAP2_AVOID_3_3V && 1081 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) { 1082 pr_err("%s: Host failed to negotiate down from 3.3V\n", 1083 mmc_hostname(host)); 1084 err = -EINVAL; 1085 goto free_card; 1086 } 1087 done: 1088 host->card = card; 1089 return 0; 1090 1091 free_card: 1092 if (!oldcard) 1093 mmc_remove_card(card); 1094 1095 return err; 1096 } 1097 1098 /* 1099 * Host is being removed. Free up the current card. 1100 */ 1101 static void mmc_sd_remove(struct mmc_host *host) 1102 { 1103 mmc_remove_card(host->card); 1104 host->card = NULL; 1105 } 1106 1107 /* 1108 * Card detection - card is alive. 1109 */ 1110 static int mmc_sd_alive(struct mmc_host *host) 1111 { 1112 return mmc_send_status(host->card, NULL); 1113 } 1114 1115 /* 1116 * Card detection callback from host. 1117 */ 1118 static void mmc_sd_detect(struct mmc_host *host) 1119 { 1120 int err; 1121 1122 mmc_get_card(host->card, NULL); 1123 1124 /* 1125 * Just check if our card has been removed. 1126 */ 1127 err = _mmc_detect_card_removed(host); 1128 1129 mmc_put_card(host->card, NULL); 1130 1131 if (err) { 1132 mmc_sd_remove(host); 1133 1134 mmc_claim_host(host); 1135 mmc_detach_bus(host); 1136 mmc_power_off(host); 1137 mmc_release_host(host); 1138 } 1139 } 1140 1141 static int _mmc_sd_suspend(struct mmc_host *host) 1142 { 1143 int err = 0; 1144 1145 mmc_claim_host(host); 1146 1147 if (mmc_card_suspended(host->card)) 1148 goto out; 1149 1150 if (!mmc_host_is_spi(host)) 1151 err = mmc_deselect_cards(host); 1152 1153 if (!err) { 1154 mmc_power_off(host); 1155 mmc_card_set_suspended(host->card); 1156 } 1157 1158 out: 1159 mmc_release_host(host); 1160 return err; 1161 } 1162 1163 /* 1164 * Callback for suspend 1165 */ 1166 static int mmc_sd_suspend(struct mmc_host *host) 1167 { 1168 int err; 1169 1170 err = _mmc_sd_suspend(host); 1171 if (!err) { 1172 pm_runtime_disable(&host->card->dev); 1173 pm_runtime_set_suspended(&host->card->dev); 1174 } 1175 1176 return err; 1177 } 1178 1179 /* 1180 * This function tries to determine if the same card is still present 1181 * and, if so, restore all state to it. 1182 */ 1183 static int _mmc_sd_resume(struct mmc_host *host) 1184 { 1185 int err = 0; 1186 1187 mmc_claim_host(host); 1188 1189 if (!mmc_card_suspended(host->card)) 1190 goto out; 1191 1192 mmc_power_up(host, host->card->ocr); 1193 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1194 mmc_card_clr_suspended(host->card); 1195 1196 out: 1197 mmc_release_host(host); 1198 return err; 1199 } 1200 1201 /* 1202 * Callback for resume 1203 */ 1204 static int mmc_sd_resume(struct mmc_host *host) 1205 { 1206 pm_runtime_enable(&host->card->dev); 1207 return 0; 1208 } 1209 1210 /* 1211 * Callback for runtime_suspend. 1212 */ 1213 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1214 { 1215 int err; 1216 1217 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1218 return 0; 1219 1220 err = _mmc_sd_suspend(host); 1221 if (err) 1222 pr_err("%s: error %d doing aggressive suspend\n", 1223 mmc_hostname(host), err); 1224 1225 return err; 1226 } 1227 1228 /* 1229 * Callback for runtime_resume. 1230 */ 1231 static int mmc_sd_runtime_resume(struct mmc_host *host) 1232 { 1233 int err; 1234 1235 err = _mmc_sd_resume(host); 1236 if (err && err != -ENOMEDIUM) 1237 pr_err("%s: error %d doing runtime resume\n", 1238 mmc_hostname(host), err); 1239 1240 return 0; 1241 } 1242 1243 static int mmc_sd_hw_reset(struct mmc_host *host) 1244 { 1245 mmc_power_cycle(host, host->card->ocr); 1246 return mmc_sd_init_card(host, host->card->ocr, host->card); 1247 } 1248 1249 static const struct mmc_bus_ops mmc_sd_ops = { 1250 .remove = mmc_sd_remove, 1251 .detect = mmc_sd_detect, 1252 .runtime_suspend = mmc_sd_runtime_suspend, 1253 .runtime_resume = mmc_sd_runtime_resume, 1254 .suspend = mmc_sd_suspend, 1255 .resume = mmc_sd_resume, 1256 .alive = mmc_sd_alive, 1257 .shutdown = mmc_sd_suspend, 1258 .hw_reset = mmc_sd_hw_reset, 1259 }; 1260 1261 /* 1262 * Starting point for SD card init. 1263 */ 1264 int mmc_attach_sd(struct mmc_host *host) 1265 { 1266 int err; 1267 u32 ocr, rocr; 1268 1269 WARN_ON(!host->claimed); 1270 1271 err = mmc_send_app_op_cond(host, 0, &ocr); 1272 if (err) 1273 return err; 1274 1275 mmc_attach_bus(host, &mmc_sd_ops); 1276 if (host->ocr_avail_sd) 1277 host->ocr_avail = host->ocr_avail_sd; 1278 1279 /* 1280 * We need to get OCR a different way for SPI. 1281 */ 1282 if (mmc_host_is_spi(host)) { 1283 mmc_go_idle(host); 1284 1285 err = mmc_spi_read_ocr(host, 0, &ocr); 1286 if (err) 1287 goto err; 1288 } 1289 1290 rocr = mmc_select_voltage(host, ocr); 1291 1292 /* 1293 * Can we support the voltage(s) of the card(s)? 1294 */ 1295 if (!rocr) { 1296 err = -EINVAL; 1297 goto err; 1298 } 1299 1300 /* 1301 * Detect and init the card. 1302 */ 1303 err = mmc_sd_init_card(host, rocr, NULL); 1304 if (err) 1305 goto err; 1306 1307 mmc_release_host(host); 1308 err = mmc_add_card(host->card); 1309 if (err) 1310 goto remove_card; 1311 1312 mmc_claim_host(host); 1313 return 0; 1314 1315 remove_card: 1316 mmc_remove_card(host->card); 1317 host->card = NULL; 1318 mmc_claim_host(host); 1319 err: 1320 mmc_detach_bus(host); 1321 1322 pr_err("%s: error %d whilst initialising SD card\n", 1323 mmc_hostname(host), err); 1324 1325 return err; 1326 } 1327