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/slab.h> 15 16#include <linux/mmc/host.h> 17#include <linux/mmc/card.h> 18#include <linux/mmc/mmc.h> 19#include <linux/mmc/sd.h> 20 21#include "core.h" 22#include "bus.h" 23#include "mmc_ops.h" 24#include "sd_ops.h" 25 26static const unsigned int tran_exp[] = { 27 10000, 100000, 1000000, 10000000, 28 0, 0, 0, 0 29}; 30 31static const unsigned char tran_mant[] = { 32 0, 10, 12, 13, 15, 20, 25, 30, 33 35, 40, 45, 50, 55, 60, 70, 80, 34}; 35 36static const unsigned int tacc_exp[] = { 37 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 38}; 39 40static const unsigned int tacc_mant[] = { 41 0, 10, 12, 13, 15, 20, 25, 30, 42 35, 40, 45, 50, 55, 60, 70, 80, 43}; 44 45#define UNSTUFF_BITS(resp,start,size) \ 46 ({ \ 47 const int __size = size; \ 48 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 49 const int __off = 3 - ((start) / 32); \ 50 const int __shft = (start) & 31; \ 51 u32 __res; \ 52 \ 53 __res = resp[__off] >> __shft; \ 54 if (__size + __shft > 32) \ 55 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 56 __res & __mask; \ 57 }) 58 59/* 60 * Given the decoded CSD structure, decode the raw CID to our CID structure. 61 */ 62void mmc_decode_cid(struct mmc_card *card) 63{ 64 u32 *resp = card->raw_cid; 65 66 memset(&card->cid, 0, sizeof(struct mmc_cid)); 67 68 /* 69 * SD doesn't currently have a version field so we will 70 * have to assume we can parse this. 71 */ 72 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 73 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 74 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 75 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 76 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 77 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 78 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 79 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 80 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 81 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 82 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 83 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 84 85 card->cid.year += 2000; /* SD cards year offset */ 86} 87 88/* 89 * Given a 128-bit response, decode to our card CSD structure. 90 */ 91static int mmc_decode_csd(struct mmc_card *card) 92{ 93 struct mmc_csd *csd = &card->csd; 94 unsigned int e, m, csd_struct; 95 u32 *resp = card->raw_csd; 96 97 csd_struct = UNSTUFF_BITS(resp, 126, 2); 98 99 switch (csd_struct) { 100 case 0: 101 m = UNSTUFF_BITS(resp, 115, 4); 102 e = UNSTUFF_BITS(resp, 112, 3); 103 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 104 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 105 106 m = UNSTUFF_BITS(resp, 99, 4); 107 e = UNSTUFF_BITS(resp, 96, 3); 108 csd->max_dtr = tran_exp[e] * tran_mant[m]; 109 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 110 111 e = UNSTUFF_BITS(resp, 47, 3); 112 m = UNSTUFF_BITS(resp, 62, 12); 113 csd->capacity = (1 + m) << (e + 2); 114 115 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 116 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 117 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 118 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 119 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 120 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 121 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 122 123 if (UNSTUFF_BITS(resp, 46, 1)) { 124 csd->erase_size = 1; 125 } else if (csd->write_blkbits >= 9) { 126 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 127 csd->erase_size <<= csd->write_blkbits - 9; 128 } 129 break; 130 case 1: 131 /* 132 * This is a block-addressed SDHC card. Most 133 * interesting fields are unused and have fixed 134 * values. To avoid getting tripped by buggy cards, 135 * we assume those fixed values ourselves. 136 */ 137 mmc_card_set_blockaddr(card); 138 139 csd->tacc_ns = 0; /* Unused */ 140 csd->tacc_clks = 0; /* Unused */ 141 142 m = UNSTUFF_BITS(resp, 99, 4); 143 e = UNSTUFF_BITS(resp, 96, 3); 144 csd->max_dtr = tran_exp[e] * tran_mant[m]; 145 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 146 147 m = UNSTUFF_BITS(resp, 48, 22); 148 csd->capacity = (1 + m) << 10; 149 150 csd->read_blkbits = 9; 151 csd->read_partial = 0; 152 csd->write_misalign = 0; 153 csd->read_misalign = 0; 154 csd->r2w_factor = 4; /* Unused */ 155 csd->write_blkbits = 9; 156 csd->write_partial = 0; 157 csd->erase_size = 1; 158 break; 159 default: 160 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", 161 mmc_hostname(card->host), csd_struct); 162 return -EINVAL; 163 } 164 165 card->erase_size = csd->erase_size; 166 167 return 0; 168} 169 170/* 171 * Given a 64-bit response, decode to our card SCR structure. 172 */ 173static int mmc_decode_scr(struct mmc_card *card) 174{ 175 struct sd_scr *scr = &card->scr; 176 unsigned int scr_struct; 177 u32 resp[4]; 178 179 resp[3] = card->raw_scr[1]; 180 resp[2] = card->raw_scr[0]; 181 182 scr_struct = UNSTUFF_BITS(resp, 60, 4); 183 if (scr_struct != 0) { 184 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n", 185 mmc_hostname(card->host), scr_struct); 186 return -EINVAL; 187 } 188 189 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 190 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 191 192 if (UNSTUFF_BITS(resp, 55, 1)) 193 card->erased_byte = 0xFF; 194 else 195 card->erased_byte = 0x0; 196 197 return 0; 198} 199 200/* 201 * Fetch and process SD Status register. 202 */ 203static int mmc_read_ssr(struct mmc_card *card) 204{ 205 unsigned int au, es, et, eo; 206 int err, i; 207 u32 *ssr; 208 209 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 210 printk(KERN_WARNING "%s: card lacks mandatory SD Status " 211 "function.\n", mmc_hostname(card->host)); 212 return 0; 213 } 214 215 ssr = kmalloc(64, GFP_KERNEL); 216 if (!ssr) 217 return -ENOMEM; 218 219 err = mmc_app_sd_status(card, ssr); 220 if (err) { 221 printk(KERN_WARNING "%s: problem reading SD Status " 222 "register.\n", mmc_hostname(card->host)); 223 err = 0; 224 goto out; 225 } 226 227 for (i = 0; i < 16; i++) 228 ssr[i] = be32_to_cpu(ssr[i]); 229 230 /* 231 * UNSTUFF_BITS only works with four u32s so we have to offset the 232 * bitfield positions accordingly. 233 */ 234 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 235 if (au > 0 || au <= 9) { 236 card->ssr.au = 1 << (au + 4); 237 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 238 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 239 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 240 if (es && et) { 241 card->ssr.erase_timeout = (et * 1000) / es; 242 card->ssr.erase_offset = eo * 1000; 243 } 244 } else { 245 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit " 246 "size.\n", mmc_hostname(card->host)); 247 } 248out: 249 kfree(ssr); 250 return err; 251} 252 253/* 254 * Fetches and decodes switch information 255 */ 256static int mmc_read_switch(struct mmc_card *card) 257{ 258 int err; 259 u8 *status; 260 261 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 262 return 0; 263 264 if (!(card->csd.cmdclass & CCC_SWITCH)) { 265 printk(KERN_WARNING "%s: card lacks mandatory switch " 266 "function, performance might suffer.\n", 267 mmc_hostname(card->host)); 268 return 0; 269 } 270 271 err = -EIO; 272 273 status = kmalloc(64, GFP_KERNEL); 274 if (!status) { 275 printk(KERN_ERR "%s: could not allocate a buffer for " 276 "switch capabilities.\n", mmc_hostname(card->host)); 277 return -ENOMEM; 278 } 279 280 err = mmc_sd_switch(card, 0, 0, 1, status); 281 if (err) { 282 /* If the host or the card can't do the switch, 283 * fail more gracefully. */ 284 if ((err != -EINVAL) 285 && (err != -ENOSYS) 286 && (err != -EFAULT)) 287 goto out; 288 289 printk(KERN_WARNING "%s: problem reading switch " 290 "capabilities, performance might suffer.\n", 291 mmc_hostname(card->host)); 292 err = 0; 293 294 goto out; 295 } 296 297 if (status[13] & 0x02) 298 card->sw_caps.hs_max_dtr = 50000000; 299 300out: 301 kfree(status); 302 303 return err; 304} 305 306/* 307 * Test if the card supports high-speed mode and, if so, switch to it. 308 */ 309int mmc_sd_switch_hs(struct mmc_card *card) 310{ 311 int err; 312 u8 *status; 313 314 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 315 return 0; 316 317 if (!(card->csd.cmdclass & CCC_SWITCH)) 318 return 0; 319 320 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 321 return 0; 322 323 if (card->sw_caps.hs_max_dtr == 0) 324 return 0; 325 326 err = -EIO; 327 328 status = kmalloc(64, GFP_KERNEL); 329 if (!status) { 330 printk(KERN_ERR "%s: could not allocate a buffer for " 331 "switch capabilities.\n", mmc_hostname(card->host)); 332 return -ENOMEM; 333 } 334 335 err = mmc_sd_switch(card, 1, 0, 1, status); 336 if (err) 337 goto out; 338 339 if ((status[16] & 0xF) != 1) { 340 printk(KERN_WARNING "%s: Problem switching card " 341 "into high-speed mode!\n", 342 mmc_hostname(card->host)); 343 err = 0; 344 } else { 345 err = 1; 346 } 347 348out: 349 kfree(status); 350 351 return err; 352} 353 354MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 355 card->raw_cid[2], card->raw_cid[3]); 356MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 357 card->raw_csd[2], card->raw_csd[3]); 358MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 359MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 360MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 361MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 362MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 363MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 364MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 365MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 366MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 367MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 368 369 370static struct attribute *sd_std_attrs[] = { 371 &dev_attr_cid.attr, 372 &dev_attr_csd.attr, 373 &dev_attr_scr.attr, 374 &dev_attr_date.attr, 375 &dev_attr_erase_size.attr, 376 &dev_attr_preferred_erase_size.attr, 377 &dev_attr_fwrev.attr, 378 &dev_attr_hwrev.attr, 379 &dev_attr_manfid.attr, 380 &dev_attr_name.attr, 381 &dev_attr_oemid.attr, 382 &dev_attr_serial.attr, 383 NULL, 384}; 385 386static struct attribute_group sd_std_attr_group = { 387 .attrs = sd_std_attrs, 388}; 389 390static const struct attribute_group *sd_attr_groups[] = { 391 &sd_std_attr_group, 392 NULL, 393}; 394 395struct device_type sd_type = { 396 .groups = sd_attr_groups, 397}; 398 399/* 400 * Fetch CID from card. 401 */ 402int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) 403{ 404 int err; 405 406 /* 407 * Since we're changing the OCR value, we seem to 408 * need to tell some cards to go back to the idle 409 * state. We wait 1ms to give cards time to 410 * respond. 411 */ 412 mmc_go_idle(host); 413 414 /* 415 * If SD_SEND_IF_COND indicates an SD 2.0 416 * compliant card and we should set bit 30 417 * of the ocr to indicate that we can handle 418 * block-addressed SDHC cards. 419 */ 420 err = mmc_send_if_cond(host, ocr); 421 if (!err) 422 ocr |= 1 << 30; 423 424 err = mmc_send_app_op_cond(host, ocr, NULL); 425 if (err) 426 return err; 427 428 if (mmc_host_is_spi(host)) 429 err = mmc_send_cid(host, cid); 430 else 431 err = mmc_all_send_cid(host, cid); 432 433 return err; 434} 435 436int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 437{ 438 int err; 439 440 /* 441 * Fetch CSD from card. 442 */ 443 err = mmc_send_csd(card, card->raw_csd); 444 if (err) 445 return err; 446 447 err = mmc_decode_csd(card); 448 if (err) 449 return err; 450 451 return 0; 452} 453 454int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 455 bool reinit) 456{ 457 int err; 458 459 if (!reinit) { 460 /* 461 * Fetch SCR from card. 462 */ 463 err = mmc_app_send_scr(card, card->raw_scr); 464 if (err) 465 return err; 466 467 err = mmc_decode_scr(card); 468 if (err) 469 return err; 470 471 /* 472 * Fetch and process SD Status register. 473 */ 474 err = mmc_read_ssr(card); 475 if (err) 476 return err; 477 478 /* Erase init depends on CSD and SSR */ 479 mmc_init_erase(card); 480 481 /* 482 * Fetch switch information from card. 483 */ 484 err = mmc_read_switch(card); 485 if (err) 486 return err; 487 } 488 489 /* 490 * For SPI, enable CRC as appropriate. 491 * This CRC enable is located AFTER the reading of the 492 * card registers because some SDHC cards are not able 493 * to provide valid CRCs for non-512-byte blocks. 494 */ 495 if (mmc_host_is_spi(host)) { 496 err = mmc_spi_set_crc(host, use_spi_crc); 497 if (err) 498 return err; 499 } 500 501 /* 502 * Check if read-only switch is active. 503 */ 504 if (!reinit) { 505 int ro = -1; 506 507 if (host->ops->get_ro) 508 ro = host->ops->get_ro(host); 509 510 if (ro < 0) { 511 printk(KERN_WARNING "%s: host does not " 512 "support reading read-only " 513 "switch. assuming write-enable.\n", 514 mmc_hostname(host)); 515 } else if (ro > 0) { 516 mmc_card_set_readonly(card); 517 } 518 } 519 520 return 0; 521} 522 523unsigned mmc_sd_get_max_clock(struct mmc_card *card) 524{ 525 unsigned max_dtr = (unsigned int)-1; 526 527 if (mmc_card_highspeed(card)) { 528 if (max_dtr > card->sw_caps.hs_max_dtr) 529 max_dtr = card->sw_caps.hs_max_dtr; 530 } else if (max_dtr > card->csd.max_dtr) { 531 max_dtr = card->csd.max_dtr; 532 } 533 534 return max_dtr; 535} 536 537void mmc_sd_go_highspeed(struct mmc_card *card) 538{ 539 mmc_card_set_highspeed(card); 540 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 541} 542 543/* 544 * Handle the detection and initialisation of a card. 545 * 546 * In the case of a resume, "oldcard" will contain the card 547 * we're trying to reinitialise. 548 */ 549static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 550 struct mmc_card *oldcard) 551{ 552 struct mmc_card *card; 553 int err; 554 u32 cid[4]; 555 556 BUG_ON(!host); 557 WARN_ON(!host->claimed); 558 559 err = mmc_sd_get_cid(host, ocr, cid); 560 if (err) 561 return err; 562 563 if (oldcard) { 564 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 565 return -ENOENT; 566 567 card = oldcard; 568 } else { 569 /* 570 * Allocate card structure. 571 */ 572 card = mmc_alloc_card(host, &sd_type); 573 if (IS_ERR(card)) 574 return PTR_ERR(card); 575 576 card->type = MMC_TYPE_SD; 577 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 578 } 579 580 /* 581 * For native busses: get card RCA and quit open drain mode. 582 */ 583 if (!mmc_host_is_spi(host)) { 584 err = mmc_send_relative_addr(host, &card->rca); 585 if (err) 586 return err; 587 588 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 589 } 590 591 if (!oldcard) { 592 err = mmc_sd_get_csd(host, card); 593 if (err) 594 return err; 595 596 mmc_decode_cid(card); 597 } 598 599 /* 600 * Select card, as all following commands rely on that. 601 */ 602 if (!mmc_host_is_spi(host)) { 603 err = mmc_select_card(card); 604 if (err) 605 return err; 606 } 607 608 err = mmc_sd_setup_card(host, card, oldcard != NULL); 609 if (err) 610 goto free_card; 611 612 /* 613 * Attempt to change to high-speed (if supported) 614 */ 615 err = mmc_sd_switch_hs(card); 616 if (err > 0) 617 mmc_sd_go_highspeed(card); 618 else if (err) 619 goto free_card; 620 621 /* 622 * Set bus speed. 623 */ 624 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 625 626 /* 627 * Switch to wider bus (if supported). 628 */ 629 if ((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 free_card; 634 635 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 636 } 637 638 host->card = card; 639 return 0; 640 641free_card: 642 if (!oldcard) 643 mmc_remove_card(card); 644 645 return err; 646} 647 648/* 649 * Host is being removed. Free up the current card. 650 */ 651static void mmc_sd_remove(struct mmc_host *host) 652{ 653 BUG_ON(!host); 654 BUG_ON(!host->card); 655 656 mmc_remove_card(host->card); 657 host->card = NULL; 658} 659 660/* 661 * Card detection callback from host. 662 */ 663static void mmc_sd_detect(struct mmc_host *host) 664{ 665 int err; 666 667 BUG_ON(!host); 668 BUG_ON(!host->card); 669 670 mmc_claim_host(host); 671 672 /* 673 * Just check if our card has been removed. 674 */ 675 err = mmc_send_status(host->card, NULL); 676 677 mmc_release_host(host); 678 679 if (err) { 680 mmc_sd_remove(host); 681 682 mmc_claim_host(host); 683 mmc_detach_bus(host); 684 mmc_release_host(host); 685 } 686} 687 688/* 689 * Suspend callback from host. 690 */ 691static int mmc_sd_suspend(struct mmc_host *host) 692{ 693 BUG_ON(!host); 694 BUG_ON(!host->card); 695 696 mmc_claim_host(host); 697 if (!mmc_host_is_spi(host)) 698 mmc_deselect_cards(host); 699 host->card->state &= ~MMC_STATE_HIGHSPEED; 700 mmc_release_host(host); 701 702 return 0; 703} 704 705/* 706 * Resume callback from host. 707 * 708 * This function tries to determine if the same card is still present 709 * and, if so, restore all state to it. 710 */ 711static int mmc_sd_resume(struct mmc_host *host) 712{ 713 int err; 714 715 BUG_ON(!host); 716 BUG_ON(!host->card); 717 718 mmc_claim_host(host); 719 err = mmc_sd_init_card(host, host->ocr, host->card); 720 mmc_release_host(host); 721 722 return err; 723} 724 725static void mmc_sd_power_restore(struct mmc_host *host) 726{ 727 host->card->state &= ~MMC_STATE_HIGHSPEED; 728 mmc_claim_host(host); 729 mmc_sd_init_card(host, host->ocr, host->card); 730 mmc_release_host(host); 731} 732 733static const struct mmc_bus_ops mmc_sd_ops = { 734 .remove = mmc_sd_remove, 735 .detect = mmc_sd_detect, 736 .suspend = NULL, 737 .resume = NULL, 738 .power_restore = mmc_sd_power_restore, 739}; 740 741static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 742 .remove = mmc_sd_remove, 743 .detect = mmc_sd_detect, 744 .suspend = mmc_sd_suspend, 745 .resume = mmc_sd_resume, 746 .power_restore = mmc_sd_power_restore, 747}; 748 749static void mmc_sd_attach_bus_ops(struct mmc_host *host) 750{ 751 const struct mmc_bus_ops *bus_ops; 752 753 if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable) 754 bus_ops = &mmc_sd_ops_unsafe; 755 else 756 bus_ops = &mmc_sd_ops; 757 mmc_attach_bus(host, bus_ops); 758} 759 760/* 761 * Starting point for SD card init. 762 */ 763int mmc_attach_sd(struct mmc_host *host, u32 ocr) 764{ 765 int err; 766 767 BUG_ON(!host); 768 WARN_ON(!host->claimed); 769 770 mmc_sd_attach_bus_ops(host); 771 772 /* 773 * We need to get OCR a different way for SPI. 774 */ 775 if (mmc_host_is_spi(host)) { 776 mmc_go_idle(host); 777 778 err = mmc_spi_read_ocr(host, 0, &ocr); 779 if (err) 780 goto err; 781 } 782 783 /* 784 * Sanity check the voltages that the card claims to 785 * support. 786 */ 787 if (ocr & 0x7F) { 788 printk(KERN_WARNING "%s: card claims to support voltages " 789 "below the defined range. These will be ignored.\n", 790 mmc_hostname(host)); 791 ocr &= ~0x7F; 792 } 793 794 if (ocr & MMC_VDD_165_195) { 795 printk(KERN_WARNING "%s: SD card claims to support the " 796 "incompletely defined 'low voltage range'. This " 797 "will be ignored.\n", mmc_hostname(host)); 798 ocr &= ~MMC_VDD_165_195; 799 } 800 801 host->ocr = mmc_select_voltage(host, ocr); 802 803 /* 804 * Can we support the voltage(s) of the card(s)? 805 */ 806 if (!host->ocr) { 807 err = -EINVAL; 808 goto err; 809 } 810 811 /* 812 * Detect and init the card. 813 */ 814 err = mmc_sd_init_card(host, host->ocr, NULL); 815 if (err) 816 goto err; 817 818 mmc_release_host(host); 819 820 err = mmc_add_card(host->card); 821 if (err) 822 goto remove_card; 823 824 return 0; 825 826remove_card: 827 mmc_remove_card(host->card); 828 host->card = NULL; 829 mmc_claim_host(host); 830err: 831 mmc_detach_bus(host); 832 mmc_release_host(host); 833 834 printk(KERN_ERR "%s: error %d whilst initialising SD card\n", 835 mmc_hostname(host), err); 836 837 return err; 838} 839