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.h" 25 #include "sd_ops.h" 26 27 static const unsigned int tran_exp[] = { 28 10000, 100000, 1000000, 10000000, 29 0, 0, 0, 0 30 }; 31 32 static const unsigned char tran_mant[] = { 33 0, 10, 12, 13, 15, 20, 25, 30, 34 35, 40, 45, 50, 55, 60, 70, 80, 35 }; 36 37 static const unsigned int tacc_exp[] = { 38 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 39 }; 40 41 static const unsigned int tacc_mant[] = { 42 0, 10, 12, 13, 15, 20, 25, 30, 43 35, 40, 45, 50, 55, 60, 70, 80, 44 }; 45 46 #define UNSTUFF_BITS(resp,start,size) \ 47 ({ \ 48 const int __size = size; \ 49 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 50 const int __off = 3 - ((start) / 32); \ 51 const int __shft = (start) & 31; \ 52 u32 __res; \ 53 \ 54 __res = resp[__off] >> __shft; \ 55 if (__size + __shft > 32) \ 56 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 57 __res & __mask; \ 58 }) 59 60 /* 61 * Given the decoded CSD structure, decode the raw CID to our CID structure. 62 */ 63 void mmc_decode_cid(struct mmc_card *card) 64 { 65 u32 *resp = card->raw_cid; 66 67 memset(&card->cid, 0, sizeof(struct mmc_cid)); 68 69 /* 70 * SD doesn't currently have a version field so we will 71 * have to assume we can parse this. 72 */ 73 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 74 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 75 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 76 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 77 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 78 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 79 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 80 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4); 81 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4); 82 card->cid.serial = UNSTUFF_BITS(resp, 24, 32); 83 card->cid.year = UNSTUFF_BITS(resp, 12, 8); 84 card->cid.month = UNSTUFF_BITS(resp, 8, 4); 85 86 card->cid.year += 2000; /* SD cards year offset */ 87 } 88 89 /* 90 * Given a 128-bit response, decode to our card CSD structure. 91 */ 92 static int mmc_decode_csd(struct mmc_card *card) 93 { 94 struct mmc_csd *csd = &card->csd; 95 unsigned int e, m, csd_struct; 96 u32 *resp = card->raw_csd; 97 98 csd_struct = UNSTUFF_BITS(resp, 126, 2); 99 100 switch (csd_struct) { 101 case 0: 102 m = UNSTUFF_BITS(resp, 115, 4); 103 e = UNSTUFF_BITS(resp, 112, 3); 104 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 105 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 106 107 m = UNSTUFF_BITS(resp, 99, 4); 108 e = UNSTUFF_BITS(resp, 96, 3); 109 csd->max_dtr = tran_exp[e] * tran_mant[m]; 110 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 111 112 e = UNSTUFF_BITS(resp, 47, 3); 113 m = UNSTUFF_BITS(resp, 62, 12); 114 csd->capacity = (1 + m) << (e + 2); 115 116 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 117 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 118 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 119 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 120 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 121 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 122 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 123 124 if (UNSTUFF_BITS(resp, 46, 1)) { 125 csd->erase_size = 1; 126 } else if (csd->write_blkbits >= 9) { 127 csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1; 128 csd->erase_size <<= csd->write_blkbits - 9; 129 } 130 break; 131 case 1: 132 /* 133 * This is a block-addressed SDHC card. Most 134 * interesting fields are unused and have fixed 135 * values. To avoid getting tripped by buggy cards, 136 * we assume those fixed values ourselves. 137 */ 138 mmc_card_set_blockaddr(card); 139 140 csd->tacc_ns = 0; /* Unused */ 141 csd->tacc_clks = 0; /* Unused */ 142 143 m = UNSTUFF_BITS(resp, 99, 4); 144 e = UNSTUFF_BITS(resp, 96, 3); 145 csd->max_dtr = tran_exp[e] * tran_mant[m]; 146 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 147 148 m = UNSTUFF_BITS(resp, 48, 22); 149 csd->capacity = (1 + m) << 10; 150 151 csd->read_blkbits = 9; 152 csd->read_partial = 0; 153 csd->write_misalign = 0; 154 csd->read_misalign = 0; 155 csd->r2w_factor = 4; /* Unused */ 156 csd->write_blkbits = 9; 157 csd->write_partial = 0; 158 csd->erase_size = 1; 159 break; 160 default: 161 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", 162 mmc_hostname(card->host), csd_struct); 163 return -EINVAL; 164 } 165 166 card->erase_size = csd->erase_size; 167 168 return 0; 169 } 170 171 /* 172 * Given a 64-bit response, decode to our card SCR structure. 173 */ 174 static int mmc_decode_scr(struct mmc_card *card) 175 { 176 struct sd_scr *scr = &card->scr; 177 unsigned int scr_struct; 178 u32 resp[4]; 179 180 resp[3] = card->raw_scr[1]; 181 resp[2] = card->raw_scr[0]; 182 183 scr_struct = UNSTUFF_BITS(resp, 60, 4); 184 if (scr_struct != 0) { 185 printk(KERN_ERR "%s: unrecognised SCR structure version %d\n", 186 mmc_hostname(card->host), scr_struct); 187 return -EINVAL; 188 } 189 190 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4); 191 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4); 192 193 if (UNSTUFF_BITS(resp, 55, 1)) 194 card->erased_byte = 0xFF; 195 else 196 card->erased_byte = 0x0; 197 198 return 0; 199 } 200 201 /* 202 * Fetch and process SD Status register. 203 */ 204 static int mmc_read_ssr(struct mmc_card *card) 205 { 206 unsigned int au, es, et, eo; 207 int err, i; 208 u32 *ssr; 209 210 if (!(card->csd.cmdclass & CCC_APP_SPEC)) { 211 printk(KERN_WARNING "%s: card lacks mandatory SD Status " 212 "function.\n", mmc_hostname(card->host)); 213 return 0; 214 } 215 216 ssr = kmalloc(64, GFP_KERNEL); 217 if (!ssr) 218 return -ENOMEM; 219 220 err = mmc_app_sd_status(card, ssr); 221 if (err) { 222 printk(KERN_WARNING "%s: problem reading SD Status " 223 "register.\n", mmc_hostname(card->host)); 224 err = 0; 225 goto out; 226 } 227 228 for (i = 0; i < 16; i++) 229 ssr[i] = be32_to_cpu(ssr[i]); 230 231 /* 232 * UNSTUFF_BITS only works with four u32s so we have to offset the 233 * bitfield positions accordingly. 234 */ 235 au = UNSTUFF_BITS(ssr, 428 - 384, 4); 236 if (au > 0 || au <= 9) { 237 card->ssr.au = 1 << (au + 4); 238 es = UNSTUFF_BITS(ssr, 408 - 384, 16); 239 et = UNSTUFF_BITS(ssr, 402 - 384, 6); 240 eo = UNSTUFF_BITS(ssr, 400 - 384, 2); 241 if (es && et) { 242 card->ssr.erase_timeout = (et * 1000) / es; 243 card->ssr.erase_offset = eo * 1000; 244 } 245 } else { 246 printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit " 247 "size.\n", mmc_hostname(card->host)); 248 } 249 out: 250 kfree(ssr); 251 return err; 252 } 253 254 /* 255 * Fetches and decodes switch information 256 */ 257 static int mmc_read_switch(struct mmc_card *card) 258 { 259 int err; 260 u8 *status; 261 262 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 263 return 0; 264 265 if (!(card->csd.cmdclass & CCC_SWITCH)) { 266 printk(KERN_WARNING "%s: card lacks mandatory switch " 267 "function, performance might suffer.\n", 268 mmc_hostname(card->host)); 269 return 0; 270 } 271 272 err = -EIO; 273 274 status = kmalloc(64, GFP_KERNEL); 275 if (!status) { 276 printk(KERN_ERR "%s: could not allocate a buffer for " 277 "switch capabilities.\n", mmc_hostname(card->host)); 278 return -ENOMEM; 279 } 280 281 err = mmc_sd_switch(card, 0, 0, 1, status); 282 if (err) { 283 /* If the host or the card can't do the switch, 284 * fail more gracefully. */ 285 if ((err != -EINVAL) 286 && (err != -ENOSYS) 287 && (err != -EFAULT)) 288 goto out; 289 290 printk(KERN_WARNING "%s: problem reading switch " 291 "capabilities, performance might suffer.\n", 292 mmc_hostname(card->host)); 293 err = 0; 294 295 goto out; 296 } 297 298 if (status[13] & 0x02) 299 card->sw_caps.hs_max_dtr = 50000000; 300 301 out: 302 kfree(status); 303 304 return err; 305 } 306 307 /* 308 * Test if the card supports high-speed mode and, if so, switch to it. 309 */ 310 int mmc_sd_switch_hs(struct mmc_card *card) 311 { 312 int err; 313 u8 *status; 314 315 if (card->scr.sda_vsn < SCR_SPEC_VER_1) 316 return 0; 317 318 if (!(card->csd.cmdclass & CCC_SWITCH)) 319 return 0; 320 321 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) 322 return 0; 323 324 if (card->sw_caps.hs_max_dtr == 0) 325 return 0; 326 327 err = -EIO; 328 329 status = kmalloc(64, GFP_KERNEL); 330 if (!status) { 331 printk(KERN_ERR "%s: could not allocate a buffer for " 332 "switch capabilities.\n", mmc_hostname(card->host)); 333 return -ENOMEM; 334 } 335 336 err = mmc_sd_switch(card, 1, 0, 1, status); 337 if (err) 338 goto out; 339 340 if ((status[16] & 0xF) != 1) { 341 printk(KERN_WARNING "%s: Problem switching card " 342 "into high-speed mode!\n", 343 mmc_hostname(card->host)); 344 err = 0; 345 } else { 346 err = 1; 347 } 348 349 out: 350 kfree(status); 351 352 return err; 353 } 354 355 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 356 card->raw_cid[2], card->raw_cid[3]); 357 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 358 card->raw_csd[2], card->raw_csd[3]); 359 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); 360 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 361 MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 362 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 363 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 364 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 365 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 366 MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 367 MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 368 MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 369 370 371 static struct attribute *sd_std_attrs[] = { 372 &dev_attr_cid.attr, 373 &dev_attr_csd.attr, 374 &dev_attr_scr.attr, 375 &dev_attr_date.attr, 376 &dev_attr_erase_size.attr, 377 &dev_attr_preferred_erase_size.attr, 378 &dev_attr_fwrev.attr, 379 &dev_attr_hwrev.attr, 380 &dev_attr_manfid.attr, 381 &dev_attr_name.attr, 382 &dev_attr_oemid.attr, 383 &dev_attr_serial.attr, 384 NULL, 385 }; 386 387 static struct attribute_group sd_std_attr_group = { 388 .attrs = sd_std_attrs, 389 }; 390 391 static const struct attribute_group *sd_attr_groups[] = { 392 &sd_std_attr_group, 393 NULL, 394 }; 395 396 struct device_type sd_type = { 397 .groups = sd_attr_groups, 398 }; 399 400 /* 401 * Fetch CID from card. 402 */ 403 int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid) 404 { 405 int err; 406 407 /* 408 * Since we're changing the OCR value, we seem to 409 * need to tell some cards to go back to the idle 410 * state. We wait 1ms to give cards time to 411 * respond. 412 */ 413 mmc_go_idle(host); 414 415 /* 416 * If SD_SEND_IF_COND indicates an SD 2.0 417 * compliant card and we should set bit 30 418 * of the ocr to indicate that we can handle 419 * block-addressed SDHC cards. 420 */ 421 err = mmc_send_if_cond(host, ocr); 422 if (!err) 423 ocr |= 1 << 30; 424 425 err = mmc_send_app_op_cond(host, ocr, NULL); 426 if (err) 427 return err; 428 429 if (mmc_host_is_spi(host)) 430 err = mmc_send_cid(host, cid); 431 else 432 err = mmc_all_send_cid(host, cid); 433 434 return err; 435 } 436 437 int mmc_sd_get_csd(struct mmc_host *host, struct mmc_card *card) 438 { 439 int err; 440 441 /* 442 * Fetch CSD from card. 443 */ 444 err = mmc_send_csd(card, card->raw_csd); 445 if (err) 446 return err; 447 448 err = mmc_decode_csd(card); 449 if (err) 450 return err; 451 452 return 0; 453 } 454 455 int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card, 456 bool reinit) 457 { 458 int err; 459 460 if (!reinit) { 461 /* 462 * Fetch SCR from card. 463 */ 464 err = mmc_app_send_scr(card, card->raw_scr); 465 if (err) 466 return err; 467 468 err = mmc_decode_scr(card); 469 if (err) 470 return err; 471 472 /* 473 * Fetch and process SD Status register. 474 */ 475 err = mmc_read_ssr(card); 476 if (err) 477 return err; 478 479 /* Erase init depends on CSD and SSR */ 480 mmc_init_erase(card); 481 482 /* 483 * Fetch switch information from card. 484 */ 485 err = mmc_read_switch(card); 486 if (err) 487 return err; 488 } 489 490 /* 491 * For SPI, enable CRC as appropriate. 492 * This CRC enable is located AFTER the reading of the 493 * card registers because some SDHC cards are not able 494 * to provide valid CRCs for non-512-byte blocks. 495 */ 496 if (mmc_host_is_spi(host)) { 497 err = mmc_spi_set_crc(host, use_spi_crc); 498 if (err) 499 return err; 500 } 501 502 /* 503 * Check if read-only switch is active. 504 */ 505 if (!reinit) { 506 int ro = -1; 507 508 if (host->ops->get_ro) 509 ro = host->ops->get_ro(host); 510 511 if (ro < 0) { 512 printk(KERN_WARNING "%s: host does not " 513 "support reading read-only " 514 "switch. assuming write-enable.\n", 515 mmc_hostname(host)); 516 } else if (ro > 0) { 517 mmc_card_set_readonly(card); 518 } 519 } 520 521 return 0; 522 } 523 524 unsigned mmc_sd_get_max_clock(struct mmc_card *card) 525 { 526 unsigned max_dtr = (unsigned int)-1; 527 528 if (mmc_card_highspeed(card)) { 529 if (max_dtr > card->sw_caps.hs_max_dtr) 530 max_dtr = card->sw_caps.hs_max_dtr; 531 } else if (max_dtr > card->csd.max_dtr) { 532 max_dtr = card->csd.max_dtr; 533 } 534 535 return max_dtr; 536 } 537 538 void mmc_sd_go_highspeed(struct mmc_card *card) 539 { 540 mmc_card_set_highspeed(card); 541 mmc_set_timing(card->host, MMC_TIMING_SD_HS); 542 } 543 544 /* 545 * Handle the detection and initialisation of a card. 546 * 547 * In the case of a resume, "oldcard" will contain the card 548 * we're trying to reinitialise. 549 */ 550 static int mmc_sd_init_card(struct mmc_host *host, u32 ocr, 551 struct mmc_card *oldcard) 552 { 553 struct mmc_card *card; 554 int err; 555 u32 cid[4]; 556 557 BUG_ON(!host); 558 WARN_ON(!host->claimed); 559 560 err = mmc_sd_get_cid(host, ocr, cid); 561 if (err) 562 return err; 563 564 if (oldcard) { 565 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) 566 return -ENOENT; 567 568 card = oldcard; 569 } else { 570 /* 571 * Allocate card structure. 572 */ 573 card = mmc_alloc_card(host, &sd_type); 574 if (IS_ERR(card)) 575 return PTR_ERR(card); 576 577 card->type = MMC_TYPE_SD; 578 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 579 } 580 581 /* 582 * For native busses: get card RCA and quit open drain mode. 583 */ 584 if (!mmc_host_is_spi(host)) { 585 err = mmc_send_relative_addr(host, &card->rca); 586 if (err) 587 return err; 588 589 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 590 } 591 592 if (!oldcard) { 593 err = mmc_sd_get_csd(host, card); 594 if (err) 595 return err; 596 597 mmc_decode_cid(card); 598 } 599 600 /* 601 * Select card, as all following commands rely on that. 602 */ 603 if (!mmc_host_is_spi(host)) { 604 err = mmc_select_card(card); 605 if (err) 606 return err; 607 } 608 609 err = mmc_sd_setup_card(host, card, oldcard != NULL); 610 if (err) 611 goto free_card; 612 613 /* 614 * Attempt to change to high-speed (if supported) 615 */ 616 err = mmc_sd_switch_hs(card); 617 if (err > 0) 618 mmc_sd_go_highspeed(card); 619 else if (err) 620 goto free_card; 621 622 /* 623 * Set bus speed. 624 */ 625 mmc_set_clock(host, mmc_sd_get_max_clock(card)); 626 627 /* 628 * Switch to wider bus (if supported). 629 */ 630 if ((host->caps & MMC_CAP_4_BIT_DATA) && 631 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) { 632 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4); 633 if (err) 634 goto free_card; 635 636 mmc_set_bus_width(host, MMC_BUS_WIDTH_4); 637 } 638 639 host->card = card; 640 return 0; 641 642 free_card: 643 if (!oldcard) 644 mmc_remove_card(card); 645 646 return err; 647 } 648 649 /* 650 * Host is being removed. Free up the current card. 651 */ 652 static void mmc_sd_remove(struct mmc_host *host) 653 { 654 BUG_ON(!host); 655 BUG_ON(!host->card); 656 657 mmc_remove_card(host->card); 658 host->card = NULL; 659 } 660 661 /* 662 * Card detection callback from host. 663 */ 664 static void mmc_sd_detect(struct mmc_host *host) 665 { 666 int err; 667 668 BUG_ON(!host); 669 BUG_ON(!host->card); 670 671 mmc_claim_host(host); 672 673 /* 674 * Just check if our card has been removed. 675 */ 676 err = mmc_send_status(host->card, NULL); 677 678 mmc_release_host(host); 679 680 if (err) { 681 mmc_sd_remove(host); 682 683 mmc_claim_host(host); 684 mmc_detach_bus(host); 685 mmc_release_host(host); 686 } 687 } 688 689 /* 690 * Suspend callback from host. 691 */ 692 static int mmc_sd_suspend(struct mmc_host *host) 693 { 694 BUG_ON(!host); 695 BUG_ON(!host->card); 696 697 mmc_claim_host(host); 698 if (!mmc_host_is_spi(host)) 699 mmc_deselect_cards(host); 700 host->card->state &= ~MMC_STATE_HIGHSPEED; 701 mmc_release_host(host); 702 703 return 0; 704 } 705 706 /* 707 * Resume callback from host. 708 * 709 * This function tries to determine if the same card is still present 710 * and, if so, restore all state to it. 711 */ 712 static int mmc_sd_resume(struct mmc_host *host) 713 { 714 int err; 715 716 BUG_ON(!host); 717 BUG_ON(!host->card); 718 719 mmc_claim_host(host); 720 err = mmc_sd_init_card(host, host->ocr, host->card); 721 mmc_release_host(host); 722 723 return err; 724 } 725 726 static int mmc_sd_power_restore(struct mmc_host *host) 727 { 728 int ret; 729 730 host->card->state &= ~MMC_STATE_HIGHSPEED; 731 mmc_claim_host(host); 732 ret = mmc_sd_init_card(host, host->ocr, host->card); 733 mmc_release_host(host); 734 735 return ret; 736 } 737 738 static const struct mmc_bus_ops mmc_sd_ops = { 739 .remove = mmc_sd_remove, 740 .detect = mmc_sd_detect, 741 .suspend = NULL, 742 .resume = NULL, 743 .power_restore = mmc_sd_power_restore, 744 }; 745 746 static const struct mmc_bus_ops mmc_sd_ops_unsafe = { 747 .remove = mmc_sd_remove, 748 .detect = mmc_sd_detect, 749 .suspend = mmc_sd_suspend, 750 .resume = mmc_sd_resume, 751 .power_restore = mmc_sd_power_restore, 752 }; 753 754 static void mmc_sd_attach_bus_ops(struct mmc_host *host) 755 { 756 const struct mmc_bus_ops *bus_ops; 757 758 if (!mmc_card_is_removable(host)) 759 bus_ops = &mmc_sd_ops_unsafe; 760 else 761 bus_ops = &mmc_sd_ops; 762 mmc_attach_bus(host, bus_ops); 763 } 764 765 /* 766 * Starting point for SD card init. 767 */ 768 int mmc_attach_sd(struct mmc_host *host) 769 { 770 int err; 771 u32 ocr; 772 773 BUG_ON(!host); 774 WARN_ON(!host->claimed); 775 776 err = mmc_send_app_op_cond(host, 0, &ocr); 777 if (err) 778 return err; 779 780 mmc_sd_attach_bus_ops(host); 781 if (host->ocr_avail_sd) 782 host->ocr_avail = host->ocr_avail_sd; 783 784 /* 785 * We need to get OCR a different way for SPI. 786 */ 787 if (mmc_host_is_spi(host)) { 788 mmc_go_idle(host); 789 790 err = mmc_spi_read_ocr(host, 0, &ocr); 791 if (err) 792 goto err; 793 } 794 795 /* 796 * Sanity check the voltages that the card claims to 797 * support. 798 */ 799 if (ocr & 0x7F) { 800 printk(KERN_WARNING "%s: card claims to support voltages " 801 "below the defined range. These will be ignored.\n", 802 mmc_hostname(host)); 803 ocr &= ~0x7F; 804 } 805 806 if ((ocr & MMC_VDD_165_195) && 807 !(host->ocr_avail_sd & MMC_VDD_165_195)) { 808 printk(KERN_WARNING "%s: SD card claims to support the " 809 "incompletely defined 'low voltage range'. This " 810 "will be ignored.\n", mmc_hostname(host)); 811 ocr &= ~MMC_VDD_165_195; 812 } 813 814 host->ocr = mmc_select_voltage(host, ocr); 815 816 /* 817 * Can we support the voltage(s) of the card(s)? 818 */ 819 if (!host->ocr) { 820 err = -EINVAL; 821 goto err; 822 } 823 824 /* 825 * Detect and init the card. 826 */ 827 err = mmc_sd_init_card(host, host->ocr, NULL); 828 if (err) 829 goto err; 830 831 mmc_release_host(host); 832 err = mmc_add_card(host->card); 833 mmc_claim_host(host); 834 if (err) 835 goto remove_card; 836 837 return 0; 838 839 remove_card: 840 mmc_release_host(host); 841 mmc_remove_card(host->card); 842 host->card = NULL; 843 mmc_claim_host(host); 844 err: 845 mmc_detach_bus(host); 846 847 printk(KERN_ERR "%s: error %d whilst initialising SD card\n", 848 mmc_hostname(host), err); 849 850 return err; 851 } 852 853