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