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 tacc_exp[] = { 43 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 44 }; 45 46 static const unsigned int tacc_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->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 115 csd->tacc_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->tacc_ns = 0; /* Unused */ 152 csd->tacc_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 u32 *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 pr_err("%s: could not allocate a buffer for " 299 "switch capabilities.\n", 300 mmc_hostname(card->host)); 301 return -ENOMEM; 302 } 303 304 /* 305 * Find out the card's support bits with a mode 0 operation. 306 * The argument does not matter, as the support bits do not 307 * change with the arguments. 308 */ 309 err = mmc_sd_switch(card, 0, 0, 0, status); 310 if (err) { 311 /* 312 * If the host or the card can't do the switch, 313 * fail more gracefully. 314 */ 315 if (err != -EINVAL && err != -ENOSYS && err != -EFAULT) 316 goto out; 317 318 pr_warn("%s: problem reading Bus Speed modes\n", 319 mmc_hostname(card->host)); 320 err = 0; 321 322 goto out; 323 } 324 325 if (status[13] & SD_MODE_HIGH_SPEED) 326 card->sw_caps.hs_max_dtr = HIGH_SPEED_MAX_DTR; 327 328 if (card->scr.sda_spec3) { 329 card->sw_caps.sd3_bus_mode = status[13]; 330 /* Driver Strengths supported by the card */ 331 card->sw_caps.sd3_drv_type = status[9]; 332 card->sw_caps.sd3_curr_limit = status[7] | status[6] << 8; 333 } 334 335 out: 336 kfree(status); 337 338 return err; 339 } 340 341 /* 342 * Test if the card supports high-speed mode and, if so, switch to it. 343 */ 344 int mmc_sd_switch_hs(struct mmc_card *card) 345 { 346 int err; 347 u8 *status; 348 349 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 350 return 0; 351 352 if (!(card->csd.cmdclass & CCC_SWITCH)) 353 return 0; 354 355 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 356 return 0; 357 358 if (card->sw_caps.hs_max_dtr == 0) 359 return 0; 360 361 status = kmalloc(64, GFP_KERNEL); 362 if (!status) { 363 pr_err("%s: could not allocate a buffer for " 364 "switch capabilities.\n", mmc_hostname(card->host)); 365 return -ENOMEM; 366 } 367 368 err = mmc_sd_switch(card, 1, 0, 1, status); 369 if (err) 370 goto out; 371 372 if ((status[16] & 0xF) != 1) { 373 pr_warn("%s: Problem switching card into high-speed mode!\n", 374 mmc_hostname(card->host)); 375 err = 0; 376 } else { 377 err = 1; 378 } 379 380 out: 381 kfree(status); 382 383 return err; 384 } 385 386 static int sd_select_driver_type(struct mmc_card *card, u8 *status) 387 { 388 int card_drv_type, drive_strength, drv_type; 389 int err; 390 391 card->drive_strength = 0; 392 393 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B; 394 395 drive_strength = mmc_select_drive_strength(card, 396 card->sw_caps.uhs_max_dtr, 397 card_drv_type, &drv_type); 398 399 if (drive_strength) { 400 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 401 if (err) 402 return err; 403 if ((status[15] & 0xF) != drive_strength) { 404 pr_warn("%s: Problem setting drive strength!\n", 405 mmc_hostname(card->host)); 406 return 0; 407 } 408 card->drive_strength = drive_strength; 409 } 410 411 if (drv_type) 412 mmc_set_driver_type(card->host, drv_type); 413 414 return 0; 415 } 416 417 static void sd_update_bus_speed_mode(struct mmc_card *card) 418 { 419 /* 420 * If the host doesn't support any of the UHS-I modes, fallback on 421 * default speed. 422 */ 423 if (!mmc_host_uhs(card->host)) { 424 card->sd_bus_speed = 0; 425 return; 426 } 427 428 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 429 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 430 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 431 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 432 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 433 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 434 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 435 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 436 SD_MODE_UHS_SDR50)) { 437 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 438 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 439 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 440 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 441 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 442 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 443 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 444 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 445 SD_MODE_UHS_SDR12)) { 446 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 447 } 448 } 449 450 static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 451 { 452 int err; 453 unsigned int timing = 0; 454 455 switch (card->sd_bus_speed) { 456 case UHS_SDR104_BUS_SPEED: 457 timing = MMC_TIMING_UHS_SDR104; 458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 459 break; 460 case UHS_DDR50_BUS_SPEED: 461 timing = MMC_TIMING_UHS_DDR50; 462 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 463 break; 464 case UHS_SDR50_BUS_SPEED: 465 timing = MMC_TIMING_UHS_SDR50; 466 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 467 break; 468 case UHS_SDR25_BUS_SPEED: 469 timing = MMC_TIMING_UHS_SDR25; 470 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 471 break; 472 case UHS_SDR12_BUS_SPEED: 473 timing = MMC_TIMING_UHS_SDR12; 474 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 475 break; 476 default: 477 return 0; 478 } 479 480 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 481 if (err) 482 return err; 483 484 if ((status[16] & 0xF) != card->sd_bus_speed) 485 pr_warn("%s: Problem setting bus speed mode!\n", 486 mmc_hostname(card->host)); 487 else { 488 mmc_set_timing(card->host, timing); 489 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 490 } 491 492 return 0; 493 } 494 495 /* Get host's max current setting at its current voltage */ 496 static u32 sd_get_host_max_current(struct mmc_host *host) 497 { 498 u32 voltage, max_current; 499 500 voltage = 1 << host->ios.vdd; 501 switch (voltage) { 502 case MMC_VDD_165_195: 503 max_current = host->max_current_180; 504 break; 505 case MMC_VDD_29_30: 506 case MMC_VDD_30_31: 507 max_current = host->max_current_300; 508 break; 509 case MMC_VDD_32_33: 510 case MMC_VDD_33_34: 511 max_current = host->max_current_330; 512 break; 513 default: 514 max_current = 0; 515 } 516 517 return max_current; 518 } 519 520 static int sd_set_current_limit(struct mmc_card *card, u8 *status) 521 { 522 int current_limit = SD_SET_CURRENT_NO_CHANGE; 523 int err; 524 u32 max_current; 525 526 /* 527 * Current limit switch is only defined for SDR50, SDR104, and DDR50 528 * bus speed modes. For other bus speed modes, we do not change the 529 * current limit. 530 */ 531 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 532 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 533 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 534 return 0; 535 536 /* 537 * Host has different current capabilities when operating at 538 * different voltages, so find out its max current first. 539 */ 540 max_current = sd_get_host_max_current(card->host); 541 542 /* 543 * We only check host's capability here, if we set a limit that is 544 * higher than the card's maximum current, the card will be using its 545 * maximum current, e.g. if the card's maximum current is 300ma, and 546 * when we set current limit to 200ma, the card will draw 200ma, and 547 * when we set current limit to 400/600/800ma, the card will draw its 548 * maximum 300ma from the host. 549 * 550 * The above is incorrect: if we try to set a current limit that is 551 * not supported by the card, the card can rightfully error out the 552 * attempt, and remain at the default current limit. This results 553 * in a 300mA card being limited to 200mA even though the host 554 * supports 800mA. Failures seen with SanDisk 8GB UHS cards with 555 * an iMX6 host. --rmk 556 */ 557 if (max_current >= 800 && 558 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_800) 559 current_limit = SD_SET_CURRENT_LIMIT_800; 560 else if (max_current >= 600 && 561 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_600) 562 current_limit = SD_SET_CURRENT_LIMIT_600; 563 else if (max_current >= 400 && 564 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_400) 565 current_limit = SD_SET_CURRENT_LIMIT_400; 566 else if (max_current >= 200 && 567 card->sw_caps.sd3_curr_limit & SD_MAX_CURRENT_200) 568 current_limit = SD_SET_CURRENT_LIMIT_200; 569 570 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 571 err = mmc_sd_switch(card, 1, 3, current_limit, status); 572 if (err) 573 return err; 574 575 if (((status[15] >> 4) & 0x0F) != current_limit) 576 pr_warn("%s: Problem setting current limit!\n", 577 mmc_hostname(card->host)); 578 579 } 580 581 return 0; 582 } 583 584 /* 585 * UHS-I specific initialization procedure 586 */ 587 static int mmc_sd_init_uhs_card(struct mmc_card *card) 588 { 589 int err; 590 u8 *status; 591 592 if (!card->scr.sda_spec3) 593 return 0; 594 595 if (!(card->csd.cmdclass & CCC_SWITCH)) 596 return 0; 597 598 status = kmalloc(64, GFP_KERNEL); 599 if (!status) { 600 pr_err("%s: could not allocate a buffer for " 601 "switch capabilities.\n", mmc_hostname(card->host)); 602 return -ENOMEM; 603 } 604 605 /* Set 4-bit bus width */ 606 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 607 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 608 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 609 if (err) 610 goto out; 611 612 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 613 } 614 615 /* 616 * Select the bus speed mode depending on host 617 * and card capability. 618 */ 619 sd_update_bus_speed_mode(card); 620 621 /* Set the driver strength for the card */ 622 err = sd_select_driver_type(card, status); 623 if (err) 624 goto out; 625 626 /* Set current limit for the card */ 627 err = sd_set_current_limit(card, status); 628 if (err) 629 goto out; 630 631 /* Set bus speed mode of the card */ 632 err = sd_set_bus_speed_mode(card, status); 633 if (err) 634 goto out; 635 636 /* 637 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 638 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 639 */ 640 if (!mmc_host_is_spi(card->host) && 641 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 642 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 643 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 644 err = mmc_execute_tuning(card); 645 646 /* 647 * As SD Specifications Part1 Physical Layer Specification 648 * Version 3.01 says, CMD19 tuning is available for unlocked 649 * cards in transfer state of 1.8V signaling mode. The small 650 * difference between v3.00 and 3.01 spec means that CMD19 651 * tuning is also available for DDR50 mode. 652 */ 653 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 654 pr_warn("%s: ddr50 tuning failed\n", 655 mmc_hostname(card->host)); 656 err = 0; 657 } 658 } 659 660 out: 661 kfree(status); 662 663 return err; 664 } 665 666 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 667 card->raw_cid[2], card->raw_cid[3]); 668 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 669 card->raw_csd[2], card->raw_csd[3]); 670 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 671 MMC_DEV_ATTR(ssr, 672 "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", 673 card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], 674 card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], 675 card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], 676 card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], 677 card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], 678 card->raw_ssr[15]); 679 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 680 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 681 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 682 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 683 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 684 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 685 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 686 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 687 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 688 MMC_DEV_ATTR(ocr, "%08x\n", card->ocr); 689 690 691 static ssize_t mmc_dsr_show(struct device *dev, 692 struct device_attribute *attr, 693 char *buf) 694 { 695 struct mmc_card *card = mmc_dev_to_card(dev); 696 struct mmc_host *host = card->host; 697 698 if (card->csd.dsr_imp && host->dsr_req) 699 return sprintf(buf, "0x%x\n", host->dsr); 700 else 701 /* return default DSR value */ 702 return sprintf(buf, "0x%x\n", 0x404); 703 } 704 705 static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL); 706 707 static struct attribute *sd_std_attrs[] = { 708 &dev_attr_cid.attr, 709 &dev_attr_csd.attr, 710 &dev_attr_scr.attr, 711 &dev_attr_ssr.attr, 712 &dev_attr_date.attr, 713 &dev_attr_erase_size.attr, 714 &dev_attr_preferred_erase_size.attr, 715 &dev_attr_fwrev.attr, 716 &dev_attr_hwrev.attr, 717 &dev_attr_manfid.attr, 718 &dev_attr_name.attr, 719 &dev_attr_oemid.attr, 720 &dev_attr_serial.attr, 721 &dev_attr_ocr.attr, 722 &dev_attr_dsr.attr, 723 NULL, 724 }; 725 ATTRIBUTE_GROUPS(sd_std); 726 727 struct device_type sd_type = { 728 .groups = sd_std_groups, 729 }; 730 731 /* 732 * Fetch CID from card. 733 */ 734 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 735 { 736 int err; 737 u32 max_current; 738 int retries = 10; 739 u32 pocr = ocr; 740 741 try_again: 742 if (!retries) { 743 ocr &= ~SD_OCR_S18R; 744 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 745 } 746 747 /* 748 * Since we're changing the OCR value, we seem to 749 * need to tell some cards to go back to the idle 750 * state. We wait 1ms to give cards time to 751 * respond. 752 */ 753 mmc_go_idle(host); 754 755 /* 756 * If SD_SEND_IF_COND indicates an SD 2.0 757 * compliant card and we should set bit 30 758 * of the ocr to indicate that we can handle 759 * block-addressed SDHC cards. 760 */ 761 err = mmc_send_if_cond(host, ocr); 762 if (!err) 763 ocr |= SD_OCR_CCS; 764 765 /* 766 * If the host supports one of UHS-I modes, request the card 767 * to switch to 1.8V signaling level. If the card has failed 768 * repeatedly to switch however, skip this. 769 */ 770 if (retries && mmc_host_uhs(host)) 771 ocr |= SD_OCR_S18R; 772 773 /* 774 * If the host can supply more than 150mA at current voltage, 775 * XPC should be set to 1. 776 */ 777 max_current = sd_get_host_max_current(host); 778 if (max_current > 150) 779 ocr |= SD_OCR_XPC; 780 781 err = mmc_send_app_op_cond(host, ocr, rocr); 782 if (err) 783 return err; 784 785 /* 786 * In case CCS and S18A in the response is set, start Signal Voltage 787 * Switch procedure. SPI mode doesn't support CMD11. 788 */ 789 if (!mmc_host_is_spi(host) && rocr && 790 ((*rocr & 0x41000000) == 0x41000000)) { 791 err = mmc_set_uhs_voltage(host, pocr); 792 if (err == -EAGAIN) { 793 retries--; 794 goto try_again; 795 } else if (err) { 796 retries = 0; 797 goto try_again; 798 } 799 } 800 801 if (mmc_host_is_spi(host)) 802 err = mmc_send_cid(host, cid); 803 else 804 err = mmc_all_send_cid(host, cid); 805 806 return err; 807 } 808 809 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 810 { 811 int err; 812 813 /* 814 * Fetch CSD from card. 815 */ 816 err = mmc_send_csd(card, card->raw_csd); 817 if (err) 818 return err; 819 820 err = mmc_decode_csd(card); 821 if (err) 822 return err; 823 824 return 0; 825 } 826 827 static int mmc_sd_get_ro(struct mmc_host *host) 828 { 829 int ro; 830 831 /* 832 * Some systems don't feature a write-protect pin and don't need one. 833 * E.g. because they only have micro-SD card slot. For those systems 834 * assume that the SD card is always read-write. 835 */ 836 if (host->caps2 & MMC_CAP2_NO_WRITE_PROTECT) 837 return 0; 838 839 if (!host->ops->get_ro) 840 return -1; 841 842 ro = host->ops->get_ro(host); 843 844 return ro; 845 } 846 847 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 848 bool reinit) 849 { 850 int err; 851 852 if (!reinit) { 853 /* 854 * Fetch SCR from card. 855 */ 856 err = mmc_app_send_scr(card, card->raw_scr); 857 if (err) 858 return err; 859 860 err = mmc_decode_scr(card); 861 if (err) 862 return err; 863 864 /* 865 * Fetch and process SD Status register. 866 */ 867 err = mmc_read_ssr(card); 868 if (err) 869 return err; 870 871 /* Erase init depends on CSD and SSR */ 872 mmc_init_erase(card); 873 874 /* 875 * Fetch switch information from card. 876 */ 877 err = mmc_read_switch(card); 878 if (err) 879 return err; 880 } 881 882 /* 883 * For SPI, enable CRC as appropriate. 884 * This CRC enable is located AFTER the reading of the 885 * card registers because some SDHC cards are not able 886 * to provide valid CRCs for non-512-byte blocks. 887 */ 888 if (mmc_host_is_spi(host)) { 889 err = mmc_spi_set_crc(host, use_spi_crc); 890 if (err) 891 return err; 892 } 893 894 /* 895 * Check if read-only switch is active. 896 */ 897 if (!reinit) { 898 int ro = mmc_sd_get_ro(host); 899 900 if (ro < 0) { 901 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 902 mmc_hostname(host)); 903 } else if (ro > 0) { 904 mmc_card_set_readonly(card); 905 } 906 } 907 908 return 0; 909 } 910 911 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 912 { 913 unsigned max_dtr = (unsigned int)-1; 914 915 if (mmc_card_hs(card)) { 916 if (max_dtr > card->sw_caps.hs_max_dtr) 917 max_dtr = card->sw_caps.hs_max_dtr; 918 } else if (max_dtr > card->csd.max_dtr) { 919 max_dtr = card->csd.max_dtr; 920 } 921 922 return max_dtr; 923 } 924 925 /* 926 * Handle the detection and initialisation of a card. 927 * 928 * In the case of a resume, "oldcard" will contain the card 929 * we're trying to reinitialise. 930 */ 931 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 932 struct mmc_card *oldcard) 933 { 934 struct mmc_card *card; 935 int err; 936 u32 cid[4]; 937 u32 rocr = 0; 938 939 WARN_ON(!host->claimed); 940 941 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 942 if (err) 943 return err; 944 945 if (oldcard) { 946 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 947 return -ENOENT; 948 949 card = oldcard; 950 } else { 951 /* 952 * Allocate card structure. 953 */ 954 card = mmc_alloc_card(host, &sd_type); 955 if (IS_ERR(card)) 956 return PTR_ERR(card); 957 958 card->ocr = ocr; 959 card->type = MMC_TYPE_SD; 960 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 961 } 962 963 /* 964 * Call the optional HC's init_card function to handle quirks. 965 */ 966 if (host->ops->init_card) 967 host->ops->init_card(host, card); 968 969 /* 970 * For native busses: get card RCA and quit open drain mode. 971 */ 972 if (!mmc_host_is_spi(host)) { 973 err = mmc_send_relative_addr(host, &card->rca); 974 if (err) 975 goto free_card; 976 } 977 978 if (!oldcard) { 979 err = mmc_sd_get_csd(host, card); 980 if (err) 981 goto free_card; 982 983 mmc_decode_cid(card); 984 } 985 986 /* 987 * handling only for cards supporting DSR and hosts requesting 988 * DSR configuration 989 */ 990 if (card->csd.dsr_imp && host->dsr_req) 991 mmc_set_dsr(host); 992 993 /* 994 * Select card, as all following commands rely on that. 995 */ 996 if (!mmc_host_is_spi(host)) { 997 err = mmc_select_card(card); 998 if (err) 999 goto free_card; 1000 } 1001 1002 err = mmc_sd_setup_card(host, card, oldcard != NULL); 1003 if (err) 1004 goto free_card; 1005 1006 /* Initialization sequence for UHS-I cards */ 1007 if (rocr & SD_ROCR_S18A) { 1008 err = mmc_sd_init_uhs_card(card); 1009 if (err) 1010 goto free_card; 1011 } else { 1012 /* 1013 * Attempt to change to high-speed (if supported) 1014 */ 1015 err = mmc_sd_switch_hs(card); 1016 if (err > 0) 1017 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1018 else if (err) 1019 goto free_card; 1020 1021 /* 1022 * Set bus speed. 1023 */ 1024 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1025 1026 /* 1027 * Switch to wider bus (if supported). 1028 */ 1029 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1030 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1031 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1032 if (err) 1033 goto free_card; 1034 1035 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1036 } 1037 } 1038 1039 host->card = card; 1040 return 0; 1041 1042 free_card: 1043 if (!oldcard) 1044 mmc_remove_card(card); 1045 1046 return err; 1047 } 1048 1049 /* 1050 * Host is being removed. Free up the current card. 1051 */ 1052 static void mmc_sd_remove(struct mmc_host *host) 1053 { 1054 mmc_remove_card(host->card); 1055 host->card = NULL; 1056 } 1057 1058 /* 1059 * Card detection - card is alive. 1060 */ 1061 static int mmc_sd_alive(struct mmc_host *host) 1062 { 1063 return mmc_send_status(host->card, NULL); 1064 } 1065 1066 /* 1067 * Card detection callback from host. 1068 */ 1069 static void mmc_sd_detect(struct mmc_host *host) 1070 { 1071 int err; 1072 1073 mmc_get_card(host->card); 1074 1075 /* 1076 * Just check if our card has been removed. 1077 */ 1078 err = _mmc_detect_card_removed(host); 1079 1080 mmc_put_card(host->card); 1081 1082 if (err) { 1083 mmc_sd_remove(host); 1084 1085 mmc_claim_host(host); 1086 mmc_detach_bus(host); 1087 mmc_power_off(host); 1088 mmc_release_host(host); 1089 } 1090 } 1091 1092 static int _mmc_sd_suspend(struct mmc_host *host) 1093 { 1094 int err = 0; 1095 1096 mmc_claim_host(host); 1097 1098 if (mmc_card_suspended(host->card)) 1099 goto out; 1100 1101 if (!mmc_host_is_spi(host)) 1102 err = mmc_deselect_cards(host); 1103 1104 if (!err) { 1105 mmc_power_off(host); 1106 mmc_card_set_suspended(host->card); 1107 } 1108 1109 out: 1110 mmc_release_host(host); 1111 return err; 1112 } 1113 1114 /* 1115 * Callback for suspend 1116 */ 1117 static int mmc_sd_suspend(struct mmc_host *host) 1118 { 1119 int err; 1120 1121 err = _mmc_sd_suspend(host); 1122 if (!err) { 1123 pm_runtime_disable(&host->card->dev); 1124 pm_runtime_set_suspended(&host->card->dev); 1125 } 1126 1127 return err; 1128 } 1129 1130 /* 1131 * This function tries to determine if the same card is still present 1132 * and, if so, restore all state to it. 1133 */ 1134 static int _mmc_sd_resume(struct mmc_host *host) 1135 { 1136 int err = 0; 1137 1138 mmc_claim_host(host); 1139 1140 if (!mmc_card_suspended(host->card)) 1141 goto out; 1142 1143 mmc_power_up(host, host->card->ocr); 1144 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1145 mmc_card_clr_suspended(host->card); 1146 1147 out: 1148 mmc_release_host(host); 1149 return err; 1150 } 1151 1152 /* 1153 * Callback for resume 1154 */ 1155 static int mmc_sd_resume(struct mmc_host *host) 1156 { 1157 pm_runtime_enable(&host->card->dev); 1158 return 0; 1159 } 1160 1161 /* 1162 * Callback for runtime_suspend. 1163 */ 1164 static int mmc_sd_runtime_suspend(struct mmc_host *host) 1165 { 1166 int err; 1167 1168 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1169 return 0; 1170 1171 err = _mmc_sd_suspend(host); 1172 if (err) 1173 pr_err("%s: error %d doing aggressive suspend\n", 1174 mmc_hostname(host), err); 1175 1176 return err; 1177 } 1178 1179 /* 1180 * Callback for runtime_resume. 1181 */ 1182 static int mmc_sd_runtime_resume(struct mmc_host *host) 1183 { 1184 int err; 1185 1186 err = _mmc_sd_resume(host); 1187 if (err && err != -ENOMEDIUM) 1188 pr_err("%s: error %d doing runtime resume\n", 1189 mmc_hostname(host), err); 1190 1191 return 0; 1192 } 1193 1194 static int mmc_sd_reset(struct mmc_host *host) 1195 { 1196 mmc_power_cycle(host, host->card->ocr); 1197 return mmc_sd_init_card(host, host->card->ocr, host->card); 1198 } 1199 1200 static const struct mmc_bus_ops mmc_sd_ops = { 1201 .remove = mmc_sd_remove, 1202 .detect = mmc_sd_detect, 1203 .runtime_suspend = mmc_sd_runtime_suspend, 1204 .runtime_resume = mmc_sd_runtime_resume, 1205 .suspend = mmc_sd_suspend, 1206 .resume = mmc_sd_resume, 1207 .alive = mmc_sd_alive, 1208 .shutdown = mmc_sd_suspend, 1209 .reset = mmc_sd_reset, 1210 }; 1211 1212 /* 1213 * Starting point for SD card init. 1214 */ 1215 int mmc_attach_sd(struct mmc_host *host) 1216 { 1217 int err; 1218 u32 ocr, rocr; 1219 1220 WARN_ON(!host->claimed); 1221 1222 err = mmc_send_app_op_cond(host, 0, &ocr); 1223 if (err) 1224 return err; 1225 1226 mmc_attach_bus(host, &mmc_sd_ops); 1227 if (host->ocr_avail_sd) 1228 host->ocr_avail = host->ocr_avail_sd; 1229 1230 /* 1231 * We need to get OCR a different way for SPI. 1232 */ 1233 if (mmc_host_is_spi(host)) { 1234 mmc_go_idle(host); 1235 1236 err = mmc_spi_read_ocr(host, 0, &ocr); 1237 if (err) 1238 goto err; 1239 } 1240 1241 rocr = mmc_select_voltage(host, ocr); 1242 1243 /* 1244 * Can we support the voltage(s) of the card(s)? 1245 */ 1246 if (!rocr) { 1247 err = -EINVAL; 1248 goto err; 1249 } 1250 1251 /* 1252 * Detect and init the card. 1253 */ 1254 err = mmc_sd_init_card(host, rocr, NULL); 1255 if (err) 1256 goto err; 1257 1258 mmc_release_host(host); 1259 err = mmc_add_card(host->card); 1260 if (err) 1261 goto remove_card; 1262 1263 mmc_claim_host(host); 1264 return 0; 1265 1266 remove_card: 1267 mmc_remove_card(host->card); 1268 host->card = NULL; 1269 mmc_claim_host(host); 1270 err: 1271 mmc_detach_bus(host); 1272 1273 pr_err("%s: error %d whilst initialising SD card\n", 1274 mmc_hostname(host), err); 1275 1276 return err; 1277 } 1278