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 "bus.h" 26#include "mmc_ops.h" 27#include "sd.h" 28#include "sd_ops.h" 29 30static const unsigned int tran_exp[] = { 31 10000, 100000, 1000000, 10000000, 32 0, 0, 0, 0 33}; 34 35static const unsigned char tran_mant[] = { 36 0, 10, 12, 13, 15, 20, 25, 30, 37 35, 40, 45, 50, 55, 60, 70, 80, 38}; 39 40static const unsigned int tacc_exp[] = { 41 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 42}; 43 44static const unsigned int tacc_mant[] = { 45 0, 10, 12, 13, 15, 20, 25, 30, 46 35, 40, 45, 50, 55, 60, 70, 80, 47}; 48 49static const unsigned int sd_au_size[] = { 50 0, SZ_16K / 512, SZ_32K / 512, SZ_64K / 512, 51 SZ_128K / 512, SZ_256K / 512, SZ_512K / 512, SZ_1M / 512, 52 SZ_2M / 512, SZ_4M / 512, SZ_8M / 512, (SZ_8M + SZ_4M) / 512, 53 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512, 54}; 55 56#define UNSTUFF_BITS(resp,start,size) \ 57 ({ \ 58 const int __size = size; \ 59 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 60 const int __off = 3 - ((start) / 32); \ 61 const int __shft = (start) & 31; \ 62 u32 __res; \ 63 \ 64 __res = resp[__off] >> __shft; \ 65 if (__size + __shft > 32) \ 66 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 67 __res & __mask; \ 68 }) 69 70/* 71 * Given the decoded CSD structure, decode the raw CID to our CID structure. 72 */ 73void mmc_decode_cid(struct mmc_card *card) 74{ 75 u32 *resp = card->raw_cid; 76 77 memset(&card->cid, 0, sizeof(struct mmc_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 */ 102static 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 */ 190static 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 */ 225static int mmc_read_ssr(struct mmc_card *card) 226{ 227 unsigned int au, es, et, eo; 228 int err, i; 229 u32 *ssr; 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 ssr = kmalloc(64, GFP_KERNEL); 238 if (!ssr) 239 return -ENOMEM; 240 241 err = mmc_app_sd_status(card, ssr); 242 if (err) { 243 pr_warn("%s: problem reading SD Status register\n", 244 mmc_hostname(card->host)); 245 err = 0; 246 goto out; 247 } 248 249 for (i = 0; i < 16; i++) 250 ssr[i] = be32_to_cpu(ssr[i]); 251 252 /* 253 * UNSTUFF_BITS only works with four u32s so we have to offset the 254 * bitfield positions accordingly. 255 */ 256 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 257 if (au) { 258 if (au <= 9 || card->scr.sda_spec3) { 259 card->ssr.au = sd_au_size[au]; 260 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 261 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 262 if (es && et) { 263 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 264 card->ssr.erase_timeout = (et * 1000) / es; 265 card->ssr.erase_offset = eo * 1000; 266 } 267 } else { 268 pr_warn("%s: SD Status: Invalid Allocation Unit size\n", 269 mmc_hostname(card->host)); 270 } 271 } 272out: 273 kfree(ssr); 274 return err; 275} 276 277/* 278 * Fetches and decodes switch information 279 */ 280static 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 } 333 334out: 335 kfree(status); 336 337 return err; 338} 339 340/* 341 * Test if the card supports high-speed mode and, if so, switch to it. 342 */ 343int mmc_sd_switch_hs(struct mmc_card *card) 344{ 345 int err; 346 u8 *status; 347 348 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 349 return 0; 350 351 if (!(card->csd.cmdclass & CCC_SWITCH)) 352 return 0; 353 354 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 355 return 0; 356 357 if (card->sw_caps.hs_max_dtr == 0) 358 return 0; 359 360 err = -EIO; 361 362 status = kmalloc(64, GFP_KERNEL); 363 if (!status) { 364 pr_err("%s: could not allocate a buffer for " 365 "switch capabilities.\n", mmc_hostname(card->host)); 366 return -ENOMEM; 367 } 368 369 err = mmc_sd_switch(card, 1, 0, 1, status); 370 if (err) 371 goto out; 372 373 if ((status[16] & 0xF) != 1) { 374 pr_warn("%s: Problem switching card into high-speed mode!\n", 375 mmc_hostname(card->host)); 376 err = 0; 377 } else { 378 err = 1; 379 } 380 381out: 382 kfree(status); 383 384 return err; 385} 386 387static int sd_select_driver_type(struct mmc_card *card, u8 *status) 388{ 389 int host_drv_type = SD_DRIVER_TYPE_B; 390 int card_drv_type = SD_DRIVER_TYPE_B; 391 int drive_strength; 392 int err; 393 394 /* 395 * If the host doesn't support any of the Driver Types A,C or D, 396 * or there is no board specific handler then default Driver 397 * Type B is used. 398 */ 399 if (!(card->host->caps & (MMC_CAP_DRIVER_TYPE_A | MMC_CAP_DRIVER_TYPE_C 400 | MMC_CAP_DRIVER_TYPE_D))) 401 return 0; 402 403 if (!card->host->ops->select_drive_strength) 404 return 0; 405 406 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A) 407 host_drv_type |= SD_DRIVER_TYPE_A; 408 409 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C) 410 host_drv_type |= SD_DRIVER_TYPE_C; 411 412 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D) 413 host_drv_type |= SD_DRIVER_TYPE_D; 414 415 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A) 416 card_drv_type |= SD_DRIVER_TYPE_A; 417 418 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C) 419 card_drv_type |= SD_DRIVER_TYPE_C; 420 421 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D) 422 card_drv_type |= SD_DRIVER_TYPE_D; 423 424 /* 425 * The drive strength that the hardware can support 426 * depends on the board design. Pass the appropriate 427 * information and let the hardware specific code 428 * return what is possible given the options 429 */ 430 mmc_host_clk_hold(card->host); 431 drive_strength = card->host->ops->select_drive_strength( 432 card->sw_caps.uhs_max_dtr, 433 host_drv_type, card_drv_type); 434 mmc_host_clk_release(card->host); 435 436 err = mmc_sd_switch(card, 1, 2, drive_strength, status); 437 if (err) 438 return err; 439 440 if ((status[15] & 0xF) != drive_strength) { 441 pr_warn("%s: Problem setting drive strength!\n", 442 mmc_hostname(card->host)); 443 return 0; 444 } 445 446 mmc_set_driver_type(card->host, drive_strength); 447 448 return 0; 449} 450 451static void sd_update_bus_speed_mode(struct mmc_card *card) 452{ 453 /* 454 * If the host doesn't support any of the UHS-I modes, fallback on 455 * default speed. 456 */ 457 if (!mmc_host_uhs(card->host)) { 458 card->sd_bus_speed = 0; 459 return; 460 } 461 462 if ((card->host->caps & MMC_CAP_UHS_SDR104) && 463 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) { 464 card->sd_bus_speed = UHS_SDR104_BUS_SPEED; 465 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && 466 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) { 467 card->sd_bus_speed = UHS_DDR50_BUS_SPEED; 468 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 469 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode & 470 SD_MODE_UHS_SDR50)) { 471 card->sd_bus_speed = UHS_SDR50_BUS_SPEED; 472 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 473 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) && 474 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) { 475 card->sd_bus_speed = UHS_SDR25_BUS_SPEED; 476 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | 477 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | 478 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode & 479 SD_MODE_UHS_SDR12)) { 480 card->sd_bus_speed = UHS_SDR12_BUS_SPEED; 481 } 482} 483 484static int sd_set_bus_speed_mode(struct mmc_card *card, u8 *status) 485{ 486 int err; 487 unsigned int timing = 0; 488 489 switch (card->sd_bus_speed) { 490 case UHS_SDR104_BUS_SPEED: 491 timing = MMC_TIMING_UHS_SDR104; 492 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR; 493 break; 494 case UHS_DDR50_BUS_SPEED: 495 timing = MMC_TIMING_UHS_DDR50; 496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR; 497 break; 498 case UHS_SDR50_BUS_SPEED: 499 timing = MMC_TIMING_UHS_SDR50; 500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR; 501 break; 502 case UHS_SDR25_BUS_SPEED: 503 timing = MMC_TIMING_UHS_SDR25; 504 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR; 505 break; 506 case UHS_SDR12_BUS_SPEED: 507 timing = MMC_TIMING_UHS_SDR12; 508 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR; 509 break; 510 default: 511 return 0; 512 } 513 514 err = mmc_sd_switch(card, 1, 0, card->sd_bus_speed, status); 515 if (err) 516 return err; 517 518 if ((status[16] & 0xF) != card->sd_bus_speed) 519 pr_warn("%s: Problem setting bus speed mode!\n", 520 mmc_hostname(card->host)); 521 else { 522 mmc_set_timing(card->host, timing); 523 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr); 524 } 525 526 return 0; 527} 528 529/* Get host's max current setting at its current voltage */ 530static u32 sd_get_host_max_current(struct mmc_host *host) 531{ 532 u32 voltage, max_current; 533 534 voltage = 1 << host->ios.vdd; 535 switch (voltage) { 536 case MMC_VDD_165_195: 537 max_current = host->max_current_180; 538 break; 539 case MMC_VDD_29_30: 540 case MMC_VDD_30_31: 541 max_current = host->max_current_300; 542 break; 543 case MMC_VDD_32_33: 544 case MMC_VDD_33_34: 545 max_current = host->max_current_330; 546 break; 547 default: 548 max_current = 0; 549 } 550 551 return max_current; 552} 553 554static int sd_set_current_limit(struct mmc_card *card, u8 *status) 555{ 556 int current_limit = SD_SET_CURRENT_NO_CHANGE; 557 int err; 558 u32 max_current; 559 560 /* 561 * Current limit switch is only defined for SDR50, SDR104, and DDR50 562 * bus speed modes. For other bus speed modes, we do not change the 563 * current limit. 564 */ 565 if ((card->sd_bus_speed != UHS_SDR50_BUS_SPEED) && 566 (card->sd_bus_speed != UHS_SDR104_BUS_SPEED) && 567 (card->sd_bus_speed != UHS_DDR50_BUS_SPEED)) 568 return 0; 569 570 /* 571 * Host has different current capabilities when operating at 572 * different voltages, so find out its max current first. 573 */ 574 max_current = sd_get_host_max_current(card->host); 575 576 /* 577 * We only check host's capability here, if we set a limit that is 578 * higher than the card's maximum current, the card will be using its 579 * maximum current, e.g. if the card's maximum current is 300ma, and 580 * when we set current limit to 200ma, the card will draw 200ma, and 581 * when we set current limit to 400/600/800ma, the card will draw its 582 * maximum 300ma from the host. 583 */ 584 if (max_current >= 800) 585 current_limit = SD_SET_CURRENT_LIMIT_800; 586 else if (max_current >= 600) 587 current_limit = SD_SET_CURRENT_LIMIT_600; 588 else if (max_current >= 400) 589 current_limit = SD_SET_CURRENT_LIMIT_400; 590 else if (max_current >= 200) 591 current_limit = SD_SET_CURRENT_LIMIT_200; 592 593 if (current_limit != SD_SET_CURRENT_NO_CHANGE) { 594 err = mmc_sd_switch(card, 1, 3, current_limit, status); 595 if (err) 596 return err; 597 598 if (((status[15] >> 4) & 0x0F) != current_limit) 599 pr_warn("%s: Problem setting current limit!\n", 600 mmc_hostname(card->host)); 601 602 } 603 604 return 0; 605} 606 607/* 608 * UHS-I specific initialization procedure 609 */ 610static int mmc_sd_init_uhs_card(struct mmc_card *card) 611{ 612 int err; 613 u8 *status; 614 615 if (!card->scr.sda_spec3) 616 return 0; 617 618 if (!(card->csd.cmdclass & CCC_SWITCH)) 619 return 0; 620 621 status = kmalloc(64, GFP_KERNEL); 622 if (!status) { 623 pr_err("%s: could not allocate a buffer for " 624 "switch capabilities.\n", mmc_hostname(card->host)); 625 return -ENOMEM; 626 } 627 628 /* Set 4-bit bus width */ 629 if ((card->host->caps & MMC_CAP_4_BIT_DATA) && 630 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 631 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 632 if (err) 633 goto out; 634 635 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4); 636 } 637 638 /* 639 * Select the bus speed mode depending on host 640 * and card capability. 641 */ 642 sd_update_bus_speed_mode(card); 643 644 /* Set the driver strength for the card */ 645 err = sd_select_driver_type(card, status); 646 if (err) 647 goto out; 648 649 /* Set current limit for the card */ 650 err = sd_set_current_limit(card, status); 651 if (err) 652 goto out; 653 654 /* Set bus speed mode of the card */ 655 err = sd_set_bus_speed_mode(card, status); 656 if (err) 657 goto out; 658 659 /* 660 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and 661 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104. 662 */ 663 if (!mmc_host_is_spi(card->host) && 664 (card->host->ios.timing == MMC_TIMING_UHS_SDR50 || 665 card->host->ios.timing == MMC_TIMING_UHS_DDR50 || 666 card->host->ios.timing == MMC_TIMING_UHS_SDR104)) { 667 err = mmc_execute_tuning(card); 668 669 /* 670 * As SD Specifications Part1 Physical Layer Specification 671 * Version 3.01 says, CMD19 tuning is available for unlocked 672 * cards in transfer state of 1.8V signaling mode. The small 673 * difference between v3.00 and 3.01 spec means that CMD19 674 * tuning is also available for DDR50 mode. 675 */ 676 if (err && card->host->ios.timing == MMC_TIMING_UHS_DDR50) { 677 pr_warn("%s: ddr50 tuning failed\n", 678 mmc_hostname(card->host)); 679 err = 0; 680 } 681 } 682 683out: 684 kfree(status); 685 686 return err; 687} 688 689MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 690 card->raw_cid[2], card->raw_cid[3]); 691MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 692 card->raw_csd[2], card->raw_csd[3]); 693MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 694MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 695MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 696MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 697MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 698MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 699MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 700MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 701MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 702MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 703 704 705static struct attribute *sd_std_attrs[] = { 706 &dev_attr_cid.attr, 707 &dev_attr_csd.attr, 708 &dev_attr_scr.attr, 709 &dev_attr_date.attr, 710 &dev_attr_erase_size.attr, 711 &dev_attr_preferred_erase_size.attr, 712 &dev_attr_fwrev.attr, 713 &dev_attr_hwrev.attr, 714 &dev_attr_manfid.attr, 715 &dev_attr_name.attr, 716 &dev_attr_oemid.attr, 717 &dev_attr_serial.attr, 718 NULL, 719}; 720ATTRIBUTE_GROUPS(sd_std); 721 722struct device_type sd_type = { 723 .groups = sd_std_groups, 724}; 725 726/* 727 * Fetch CID from card. 728 */ 729int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 730{ 731 int err; 732 u32 max_current; 733 int retries = 10; 734 u32 pocr = ocr; 735 736try_again: 737 if (!retries) { 738 ocr &= ~SD_OCR_S18R; 739 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host)); 740 } 741 742 /* 743 * Since we're changing the OCR value, we seem to 744 * need to tell some cards to go back to the idle 745 * state. We wait 1ms to give cards time to 746 * respond. 747 */ 748 mmc_go_idle(host); 749 750 /* 751 * If SD_SEND_IF_COND indicates an SD 2.0 752 * compliant card and we should set bit 30 753 * of the ocr to indicate that we can handle 754 * block-addressed SDHC cards. 755 */ 756 err = mmc_send_if_cond(host, ocr); 757 if (!err) 758 ocr |= SD_OCR_CCS; 759 760 /* 761 * If the host supports one of UHS-I modes, request the card 762 * to switch to 1.8V signaling level. If the card has failed 763 * repeatedly to switch however, skip this. 764 */ 765 if (retries && mmc_host_uhs(host)) 766 ocr |= SD_OCR_S18R; 767 768 /* 769 * If the host can supply more than 150mA at current voltage, 770 * XPC should be set to 1. 771 */ 772 max_current = sd_get_host_max_current(host); 773 if (max_current > 150) 774 ocr |= SD_OCR_XPC; 775 776 err = mmc_send_app_op_cond(host, ocr, rocr); 777 if (err) 778 return err; 779 780 /* 781 * In case CCS and S18A in the response is set, start Signal Voltage 782 * Switch procedure. SPI mode doesn't support CMD11. 783 */ 784 if (!mmc_host_is_spi(host) && rocr && 785 ((*rocr & 0x41000000) == 0x41000000)) { 786 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 787 pocr); 788 if (err == -EAGAIN) { 789 retries--; 790 goto try_again; 791 } else if (err) { 792 retries = 0; 793 goto try_again; 794 } 795 } 796 797 if (mmc_host_is_spi(host)) 798 err = mmc_send_cid(host, cid); 799 else 800 err = mmc_all_send_cid(host, cid); 801 802 return err; 803} 804 805int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 806{ 807 int err; 808 809 /* 810 * Fetch CSD from card. 811 */ 812 err = mmc_send_csd(card, card->raw_csd); 813 if (err) 814 return err; 815 816 err = mmc_decode_csd(card); 817 if (err) 818 return err; 819 820 return 0; 821} 822 823int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 824 bool reinit) 825{ 826 int err; 827 828 if (!reinit) { 829 /* 830 * Fetch SCR from card. 831 */ 832 err = mmc_app_send_scr(card, card->raw_scr); 833 if (err) 834 return err; 835 836 err = mmc_decode_scr(card); 837 if (err) 838 return err; 839 840 /* 841 * Fetch and process SD Status register. 842 */ 843 err = mmc_read_ssr(card); 844 if (err) 845 return err; 846 847 /* Erase init depends on CSD and SSR */ 848 mmc_init_erase(card); 849 850 /* 851 * Fetch switch information from card. 852 */ 853 err = mmc_read_switch(card); 854 if (err) 855 return err; 856 } 857 858 /* 859 * For SPI, enable CRC as appropriate. 860 * This CRC enable is located AFTER the reading of the 861 * card registers because some SDHC cards are not able 862 * to provide valid CRCs for non-512-byte blocks. 863 */ 864 if (mmc_host_is_spi(host)) { 865 err = mmc_spi_set_crc(host, use_spi_crc); 866 if (err) 867 return err; 868 } 869 870 /* 871 * Check if read-only switch is active. 872 */ 873 if (!reinit) { 874 int ro = -1; 875 876 if (host->ops->get_ro) { 877 mmc_host_clk_hold(card->host); 878 ro = host->ops->get_ro(host); 879 mmc_host_clk_release(card->host); 880 } 881 882 if (ro < 0) { 883 pr_warn("%s: host does not support reading read-only switch, assuming write-enable\n", 884 mmc_hostname(host)); 885 } else if (ro > 0) { 886 mmc_card_set_readonly(card); 887 } 888 } 889 890 return 0; 891} 892 893unsigned mmc_sd_get_max_clock(struct mmc_card *card) 894{ 895 unsigned max_dtr = (unsigned int)-1; 896 897 if (mmc_card_hs(card)) { 898 if (max_dtr > card->sw_caps.hs_max_dtr) 899 max_dtr = card->sw_caps.hs_max_dtr; 900 } else if (max_dtr > card->csd.max_dtr) { 901 max_dtr = card->csd.max_dtr; 902 } 903 904 return max_dtr; 905} 906 907/* 908 * Handle the detection and initialisation of a card. 909 * 910 * In the case of a resume, "oldcard" will contain the card 911 * we're trying to reinitialise. 912 */ 913static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 914 struct mmc_card *oldcard) 915{ 916 struct mmc_card *card; 917 int err; 918 u32 cid[4]; 919 u32 rocr = 0; 920 921 BUG_ON(!host); 922 WARN_ON(!host->claimed); 923 924 err = mmc_sd_get_cid(host, ocr, cid, &rocr); 925 if (err) 926 return err; 927 928 if (oldcard) { 929 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 930 return -ENOENT; 931 932 card = oldcard; 933 } else { 934 /* 935 * Allocate card structure. 936 */ 937 card = mmc_alloc_card(host, &sd_type); 938 if (IS_ERR(card)) 939 return PTR_ERR(card); 940 941 card->ocr = ocr; 942 card->type = MMC_TYPE_SD; 943 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 944 } 945 946 /* 947 * Call the optional HC's init_card function to handle quirks. 948 */ 949 if (host->ops->init_card) 950 host->ops->init_card(host, card); 951 952 /* 953 * For native busses: get card RCA and quit open drain mode. 954 */ 955 if (!mmc_host_is_spi(host)) { 956 err = mmc_send_relative_addr(host, &card->rca); 957 if (err) 958 goto free_card; 959 } 960 961 if (!oldcard) { 962 err = mmc_sd_get_csd(host, card); 963 if (err) 964 goto free_card; 965 966 mmc_decode_cid(card); 967 } 968 969 /* 970 * handling only for cards supporting DSR and hosts requesting 971 * DSR configuration 972 */ 973 if (card->csd.dsr_imp && host->dsr_req) 974 mmc_set_dsr(host); 975 976 /* 977 * Select card, as all following commands rely on that. 978 */ 979 if (!mmc_host_is_spi(host)) { 980 err = mmc_select_card(card); 981 if (err) 982 goto free_card; 983 } 984 985 err = mmc_sd_setup_card(host, card, oldcard != NULL); 986 if (err) 987 goto free_card; 988 989 /* Initialization sequence for UHS-I cards */ 990 if (rocr & SD_ROCR_S18A) { 991 err = mmc_sd_init_uhs_card(card); 992 if (err) 993 goto free_card; 994 } else { 995 /* 996 * Attempt to change to high-speed (if supported) 997 */ 998 err = mmc_sd_switch_hs(card); 999 if (err > 0) 1000 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 1001 else if (err) 1002 goto free_card; 1003 1004 /* 1005 * Set bus speed. 1006 */ 1007 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 1008 1009 /* 1010 * Switch to wider bus (if supported). 1011 */ 1012 if ((host->caps & MMC_CAP_4_BIT_DATA) && 1013 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 1014 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 1015 if (err) 1016 goto free_card; 1017 1018 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 1019 } 1020 } 1021 1022 host->card = card; 1023 return 0; 1024 1025free_card: 1026 if (!oldcard) 1027 mmc_remove_card(card); 1028 1029 return err; 1030} 1031 1032/* 1033 * Host is being removed. Free up the current card. 1034 */ 1035static void mmc_sd_remove(struct mmc_host *host) 1036{ 1037 BUG_ON(!host); 1038 BUG_ON(!host->card); 1039 1040 mmc_remove_card(host->card); 1041 host->card = NULL; 1042} 1043 1044/* 1045 * Card detection - card is alive. 1046 */ 1047static int mmc_sd_alive(struct mmc_host *host) 1048{ 1049 return mmc_send_status(host->card, NULL); 1050} 1051 1052/* 1053 * Card detection callback from host. 1054 */ 1055static void mmc_sd_detect(struct mmc_host *host) 1056{ 1057 int err; 1058 1059 BUG_ON(!host); 1060 BUG_ON(!host->card); 1061 1062 mmc_get_card(host->card); 1063 1064 /* 1065 * Just check if our card has been removed. 1066 */ 1067 err = _mmc_detect_card_removed(host); 1068 1069 mmc_put_card(host->card); 1070 1071 if (err) { 1072 mmc_sd_remove(host); 1073 1074 mmc_claim_host(host); 1075 mmc_detach_bus(host); 1076 mmc_power_off(host); 1077 mmc_release_host(host); 1078 } 1079} 1080 1081static int _mmc_sd_suspend(struct mmc_host *host) 1082{ 1083 int err = 0; 1084 1085 BUG_ON(!host); 1086 BUG_ON(!host->card); 1087 1088 mmc_claim_host(host); 1089 1090 if (mmc_card_suspended(host->card)) 1091 goto out; 1092 1093 if (!mmc_host_is_spi(host)) 1094 err = mmc_deselect_cards(host); 1095 1096 if (!err) { 1097 mmc_power_off(host); 1098 mmc_card_set_suspended(host->card); 1099 } 1100 1101out: 1102 mmc_release_host(host); 1103 return err; 1104} 1105 1106/* 1107 * Callback for suspend 1108 */ 1109static int mmc_sd_suspend(struct mmc_host *host) 1110{ 1111 int err; 1112 1113 err = _mmc_sd_suspend(host); 1114 if (!err) { 1115 pm_runtime_disable(&host->card->dev); 1116 pm_runtime_set_suspended(&host->card->dev); 1117 } 1118 1119 return err; 1120} 1121 1122/* 1123 * This function tries to determine if the same card is still present 1124 * and, if so, restore all state to it. 1125 */ 1126static int _mmc_sd_resume(struct mmc_host *host) 1127{ 1128 int err = 0; 1129 1130 BUG_ON(!host); 1131 BUG_ON(!host->card); 1132 1133 mmc_claim_host(host); 1134 1135 if (!mmc_card_suspended(host->card)) 1136 goto out; 1137 1138 mmc_power_up(host, host->card->ocr); 1139 err = mmc_sd_init_card(host, host->card->ocr, host->card); 1140 mmc_card_clr_suspended(host->card); 1141 1142out: 1143 mmc_release_host(host); 1144 return err; 1145} 1146 1147/* 1148 * Callback for resume 1149 */ 1150static int mmc_sd_resume(struct mmc_host *host) 1151{ 1152 int err = 0; 1153 1154 if (!(host->caps & MMC_CAP_RUNTIME_RESUME)) { 1155 err = _mmc_sd_resume(host); 1156 pm_runtime_set_active(&host->card->dev); 1157 pm_runtime_mark_last_busy(&host->card->dev); 1158 } 1159 pm_runtime_enable(&host->card->dev); 1160 1161 return err; 1162} 1163 1164/* 1165 * Callback for runtime_suspend. 1166 */ 1167static int mmc_sd_runtime_suspend(struct mmc_host *host) 1168{ 1169 int err; 1170 1171 if (!(host->caps & MMC_CAP_AGGRESSIVE_PM)) 1172 return 0; 1173 1174 err = _mmc_sd_suspend(host); 1175 if (err) 1176 pr_err("%s: error %d doing aggressive suspend\n", 1177 mmc_hostname(host), err); 1178 1179 return err; 1180} 1181 1182/* 1183 * Callback for runtime_resume. 1184 */ 1185static int mmc_sd_runtime_resume(struct mmc_host *host) 1186{ 1187 int err; 1188 1189 if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME))) 1190 return 0; 1191 1192 err = _mmc_sd_resume(host); 1193 if (err) 1194 pr_err("%s: error %d doing aggressive resume\n", 1195 mmc_hostname(host), err); 1196 1197 return 0; 1198} 1199 1200static int mmc_sd_power_restore(struct mmc_host *host) 1201{ 1202 int ret; 1203 1204 mmc_claim_host(host); 1205 ret = mmc_sd_init_card(host, host->card->ocr, host->card); 1206 mmc_release_host(host); 1207 1208 return ret; 1209} 1210 1211static int mmc_sd_reset(struct mmc_host *host) 1212{ 1213 mmc_power_cycle(host, host->card->ocr); 1214 return mmc_sd_power_restore(host); 1215} 1216 1217static const struct mmc_bus_ops mmc_sd_ops = { 1218 .remove = mmc_sd_remove, 1219 .detect = mmc_sd_detect, 1220 .runtime_suspend = mmc_sd_runtime_suspend, 1221 .runtime_resume = mmc_sd_runtime_resume, 1222 .suspend = mmc_sd_suspend, 1223 .resume = mmc_sd_resume, 1224 .power_restore = mmc_sd_power_restore, 1225 .alive = mmc_sd_alive, 1226 .shutdown = mmc_sd_suspend, 1227 .reset = mmc_sd_reset, 1228}; 1229 1230/* 1231 * Starting point for SD card init. 1232 */ 1233int mmc_attach_sd(struct mmc_host *host) 1234{ 1235 int err; 1236 u32 ocr, rocr; 1237 1238 BUG_ON(!host); 1239 WARN_ON(!host->claimed); 1240 1241 err = mmc_send_app_op_cond(host, 0, &ocr); 1242 if (err) 1243 return err; 1244 1245 mmc_attach_bus(host, &mmc_sd_ops); 1246 if (host->ocr_avail_sd) 1247 host->ocr_avail = host->ocr_avail_sd; 1248 1249 /* 1250 * We need to get OCR a different way for SPI. 1251 */ 1252 if (mmc_host_is_spi(host)) { 1253 mmc_go_idle(host); 1254 1255 err = mmc_spi_read_ocr(host, 0, &ocr); 1256 if (err) 1257 goto err; 1258 } 1259 1260 rocr = mmc_select_voltage(host, ocr); 1261 1262 /* 1263 * Can we support the voltage(s) of the card(s)? 1264 */ 1265 if (!rocr) { 1266 err = -EINVAL; 1267 goto err; 1268 } 1269 1270 /* 1271 * Detect and init the card. 1272 */ 1273 err = mmc_sd_init_card(host, rocr, NULL); 1274 if (err) 1275 goto err; 1276 1277 mmc_release_host(host); 1278 err = mmc_add_card(host->card); 1279 mmc_claim_host(host); 1280 if (err) 1281 goto remove_card; 1282 1283 return 0; 1284 1285remove_card: 1286 mmc_release_host(host); 1287 mmc_remove_card(host->card); 1288 host->card = NULL; 1289 mmc_claim_host(host); 1290err: 1291 mmc_detach_bus(host); 1292 1293 pr_err("%s: error %d whilst initialising SD card\n", 1294 mmc_hostname(host), err); 1295 1296 return err; 1297} 1298