1/* 2 * linux/drivers/mmc/core/mmc.c 3 * 4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved. 5 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved. 6 * MMCv4 support Copyright (C) 2006 Philip Langdale, 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 20#include "core.h" 21#include "bus.h" 22#include "mmc_ops.h" 23 24static const unsigned int tran_exp[] = { 25 10000, 100000, 1000000, 10000000, 26 0, 0, 0, 0 27}; 28 29static const unsigned char tran_mant[] = { 30 0, 10, 12, 13, 15, 20, 25, 30, 31 35, 40, 45, 50, 55, 60, 70, 80, 32}; 33 34static const unsigned int tacc_exp[] = { 35 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 36}; 37 38static const unsigned int tacc_mant[] = { 39 0, 10, 12, 13, 15, 20, 25, 30, 40 35, 40, 45, 50, 55, 60, 70, 80, 41}; 42 43#define UNSTUFF_BITS(resp,start,size) \ 44 ({ \ 45 const int __size = size; \ 46 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \ 47 const int __off = 3 - ((start) / 32); \ 48 const int __shft = (start) & 31; \ 49 u32 __res; \ 50 \ 51 __res = resp[__off] >> __shft; \ 52 if (__size + __shft > 32) \ 53 __res |= resp[__off-1] << ((32 - __shft) % 32); \ 54 __res & __mask; \ 55 }) 56 57/* 58 * Given the decoded CSD structure, decode the raw CID to our CID structure. 59 */ 60static int mmc_decode_cid(struct mmc_card *card) 61{ 62 u32 *resp = card->raw_cid; 63 64 /* 65 * The selection of the format here is based upon published 66 * specs from sandisk and from what people have reported. 67 */ 68 switch (card->csd.mmca_vsn) { 69 case 0: /* MMC v1.0 - v1.2 */ 70 case 1: /* MMC v1.4 */ 71 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24); 72 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 73 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 74 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 75 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 76 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 77 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); 78 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8); 79 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4); 80 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4); 81 card->cid.serial = UNSTUFF_BITS(resp, 16, 24); 82 card->cid.month = UNSTUFF_BITS(resp, 12, 4); 83 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; 84 break; 85 86 case 2: /* MMC v2.0 - v2.2 */ 87 case 3: /* MMC v3.1 - v3.3 */ 88 case 4: /* MMC v4 */ 89 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8); 90 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16); 91 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8); 92 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8); 93 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8); 94 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8); 95 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8); 96 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8); 97 card->cid.serial = UNSTUFF_BITS(resp, 16, 32); 98 card->cid.month = UNSTUFF_BITS(resp, 12, 4); 99 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997; 100 break; 101 102 default: 103 printk(KERN_ERR "%s: card has unknown MMCA version %d\n", 104 mmc_hostname(card->host), card->csd.mmca_vsn); 105 return -EINVAL; 106 } 107 108 return 0; 109} 110 111static void mmc_set_erase_size(struct mmc_card *card) 112{ 113 if (card->ext_csd.erase_group_def & 1) 114 card->erase_size = card->ext_csd.hc_erase_size; 115 else 116 card->erase_size = card->csd.erase_size; 117 118 mmc_init_erase(card); 119} 120 121/* 122 * Given a 128-bit response, decode to our card CSD structure. 123 */ 124static int mmc_decode_csd(struct mmc_card *card) 125{ 126 struct mmc_csd *csd = &card->csd; 127 unsigned int e, m, a, b; 128 u32 *resp = card->raw_csd; 129 130 /* 131 * We only understand CSD structure v1.1 and v1.2. 132 * v1.2 has extra information in bits 15, 11 and 10. 133 * We also support eMMC v4.4 & v4.41. 134 */ 135 csd->structure = UNSTUFF_BITS(resp, 126, 2); 136 if (csd->structure == 0) { 137 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n", 138 mmc_hostname(card->host), csd->structure); 139 return -EINVAL; 140 } 141 142 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4); 143 m = UNSTUFF_BITS(resp, 115, 4); 144 e = UNSTUFF_BITS(resp, 112, 3); 145 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10; 146 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100; 147 148 m = UNSTUFF_BITS(resp, 99, 4); 149 e = UNSTUFF_BITS(resp, 96, 3); 150 csd->max_dtr = tran_exp[e] * tran_mant[m]; 151 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12); 152 153 e = UNSTUFF_BITS(resp, 47, 3); 154 m = UNSTUFF_BITS(resp, 62, 12); 155 csd->capacity = (1 + m) << (e + 2); 156 157 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4); 158 csd->read_partial = UNSTUFF_BITS(resp, 79, 1); 159 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1); 160 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1); 161 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3); 162 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4); 163 csd->write_partial = UNSTUFF_BITS(resp, 21, 1); 164 165 if (csd->write_blkbits >= 9) { 166 a = UNSTUFF_BITS(resp, 42, 5); 167 b = UNSTUFF_BITS(resp, 37, 5); 168 csd->erase_size = (a + 1) * (b + 1); 169 csd->erase_size <<= csd->write_blkbits - 9; 170 } 171 172 return 0; 173} 174 175/* 176 * Read and decode extended CSD. 177 */ 178static int mmc_read_ext_csd(struct mmc_card *card) 179{ 180 int err; 181 u8 *ext_csd; 182 183 BUG_ON(!card); 184 185 if (card->csd.mmca_vsn < CSD_SPEC_VER_4) 186 return 0; 187 188 /* 189 * As the ext_csd is so large and mostly unused, we don't store the 190 * raw block in mmc_card. 191 */ 192 ext_csd = kmalloc(512, GFP_KERNEL); 193 if (!ext_csd) { 194 printk(KERN_ERR "%s: could not allocate a buffer to " 195 "receive the ext_csd.\n", mmc_hostname(card->host)); 196 return -ENOMEM; 197 } 198 199 err = mmc_send_ext_csd(card, ext_csd); 200 if (err) { 201 /* If the host or the card can't do the switch, 202 * fail more gracefully. */ 203 if ((err != -EINVAL) 204 && (err != -ENOSYS) 205 && (err != -EFAULT)) 206 goto out; 207 208 /* 209 * High capacity cards should have this "magic" size 210 * stored in their CSD. 211 */ 212 if (card->csd.capacity == (4096 * 512)) { 213 printk(KERN_ERR "%s: unable to read EXT_CSD " 214 "on a possible high capacity card. " 215 "Card will be ignored.\n", 216 mmc_hostname(card->host)); 217 } else { 218 printk(KERN_WARNING "%s: unable to read " 219 "EXT_CSD, performance might " 220 "suffer.\n", 221 mmc_hostname(card->host)); 222 err = 0; 223 } 224 225 goto out; 226 } 227 228 /* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */ 229 if (card->csd.structure == 3) { 230 int ext_csd_struct = ext_csd[EXT_CSD_STRUCTURE]; 231 if (ext_csd_struct > 2) { 232 printk(KERN_ERR "%s: unrecognised EXT_CSD structure " 233 "version %d\n", mmc_hostname(card->host), 234 ext_csd_struct); 235 err = -EINVAL; 236 goto out; 237 } 238 } 239 240 card->ext_csd.rev = ext_csd[EXT_CSD_REV]; 241 if (card->ext_csd.rev > 5) { 242 printk(KERN_ERR "%s: unrecognised EXT_CSD revision %d\n", 243 mmc_hostname(card->host), card->ext_csd.rev); 244 err = -EINVAL; 245 goto out; 246 } 247 248 if (card->ext_csd.rev >= 2) { 249 card->ext_csd.sectors = 250 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 | 251 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 | 252 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 | 253 ext_csd[EXT_CSD_SEC_CNT + 3] << 24; 254 255 /* Cards with density > 2GiB are sector addressed */ 256 if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512) 257 mmc_card_set_blockaddr(card); 258 } 259 260 switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) { 261 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26: 262 card->ext_csd.hs_max_dtr = 52000000; 263 break; 264 case EXT_CSD_CARD_TYPE_26: 265 card->ext_csd.hs_max_dtr = 26000000; 266 break; 267 default: 268 /* MMC v4 spec says this cannot happen */ 269 printk(KERN_WARNING "%s: card is mmc v4 but doesn't " 270 "support any high-speed modes.\n", 271 mmc_hostname(card->host)); 272 } 273 274 if (card->ext_csd.rev >= 3) { 275 u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT]; 276 277 /* Sleep / awake timeout in 100ns units */ 278 if (sa_shift > 0 && sa_shift <= 0x17) 279 card->ext_csd.sa_timeout = 280 1 << ext_csd[EXT_CSD_S_A_TIMEOUT]; 281 card->ext_csd.erase_group_def = 282 ext_csd[EXT_CSD_ERASE_GROUP_DEF]; 283 card->ext_csd.hc_erase_timeout = 300 * 284 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]; 285 card->ext_csd.hc_erase_size = 286 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10; 287 } 288 289 if (card->ext_csd.rev >= 4) { 290 card->ext_csd.sec_trim_mult = 291 ext_csd[EXT_CSD_SEC_TRIM_MULT]; 292 card->ext_csd.sec_erase_mult = 293 ext_csd[EXT_CSD_SEC_ERASE_MULT]; 294 card->ext_csd.sec_feature_support = 295 ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]; 296 card->ext_csd.trim_timeout = 300 * 297 ext_csd[EXT_CSD_TRIM_MULT]; 298 } 299 300 if (ext_csd[EXT_CSD_ERASED_MEM_CONT]) 301 card->erased_byte = 0xFF; 302 else 303 card->erased_byte = 0x0; 304 305out: 306 kfree(ext_csd); 307 308 return err; 309} 310 311MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], 312 card->raw_cid[2], card->raw_cid[3]); 313MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], 314 card->raw_csd[2], card->raw_csd[3]); 315MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); 316MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); 317MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); 318MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev); 319MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev); 320MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid); 321MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name); 322MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid); 323MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial); 324 325static struct attribute *mmc_std_attrs[] = { 326 &dev_attr_cid.attr, 327 &dev_attr_csd.attr, 328 &dev_attr_date.attr, 329 &dev_attr_erase_size.attr, 330 &dev_attr_preferred_erase_size.attr, 331 &dev_attr_fwrev.attr, 332 &dev_attr_hwrev.attr, 333 &dev_attr_manfid.attr, 334 &dev_attr_name.attr, 335 &dev_attr_oemid.attr, 336 &dev_attr_serial.attr, 337 NULL, 338}; 339 340static struct attribute_group mmc_std_attr_group = { 341 .attrs = mmc_std_attrs, 342}; 343 344static const struct attribute_group *mmc_attr_groups[] = { 345 &mmc_std_attr_group, 346 NULL, 347}; 348 349static struct device_type mmc_type = { 350 .groups = mmc_attr_groups, 351}; 352 353/* 354 * Handle the detection and initialisation of a card. 355 * 356 * In the case of a resume, "oldcard" will contain the card 357 * we're trying to reinitialise. 358 */ 359static int mmc_init_card(struct mmc_host *host, u32 ocr, 360 struct mmc_card *oldcard) 361{ 362 struct mmc_card *card; 363 int err; 364 u32 cid[4]; 365 unsigned int max_dtr; 366 367 BUG_ON(!host); 368 WARN_ON(!host->claimed); 369 370 /* 371 * Since we're changing the OCR value, we seem to 372 * need to tell some cards to go back to the idle 373 * state. We wait 1ms to give cards time to 374 * respond. 375 */ 376 mmc_go_idle(host); 377 378 /* The extra bit indicates that we support high capacity */ 379 err = mmc_send_op_cond(host, ocr | (1 << 30), NULL); 380 if (err) 381 goto err; 382 383 /* 384 * For SPI, enable CRC as appropriate. 385 */ 386 if (mmc_host_is_spi(host)) { 387 err = mmc_spi_set_crc(host, use_spi_crc); 388 if (err) 389 goto err; 390 } 391 392 /* 393 * Fetch CID from card. 394 */ 395 if (mmc_host_is_spi(host)) 396 err = mmc_send_cid(host, cid); 397 else 398 err = mmc_all_send_cid(host, cid); 399 if (err) 400 goto err; 401 402 if (oldcard) { 403 if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) { 404 err = -ENOENT; 405 goto err; 406 } 407 408 card = oldcard; 409 } else { 410 /* 411 * Allocate card structure. 412 */ 413 card = mmc_alloc_card(host, &mmc_type); 414 if (IS_ERR(card)) { 415 err = PTR_ERR(card); 416 goto err; 417 } 418 419 card->type = MMC_TYPE_MMC; 420 card->rca = 1; 421 memcpy(card->raw_cid, cid, sizeof(card->raw_cid)); 422 } 423 424 /* 425 * For native busses: set card RCA and quit open drain mode. 426 */ 427 if (!mmc_host_is_spi(host)) { 428 err = mmc_set_relative_addr(card); 429 if (err) 430 goto free_card; 431 432 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL); 433 } 434 435 if (!oldcard) { 436 /* 437 * Fetch CSD from card. 438 */ 439 err = mmc_send_csd(card, card->raw_csd); 440 if (err) 441 goto free_card; 442 443 err = mmc_decode_csd(card); 444 if (err) 445 goto free_card; 446 err = mmc_decode_cid(card); 447 if (err) 448 goto free_card; 449 } 450 451 /* 452 * Select card, as all following commands rely on that. 453 */ 454 if (!mmc_host_is_spi(host)) { 455 err = mmc_select_card(card); 456 if (err) 457 goto free_card; 458 } 459 460 if (!oldcard) { 461 /* 462 * Fetch and process extended CSD. 463 */ 464 err = mmc_read_ext_csd(card); 465 if (err) 466 goto free_card; 467 /* Erase size depends on CSD and Extended CSD */ 468 mmc_set_erase_size(card); 469 } 470 471 /* 472 * Activate high speed (if supported) 473 */ 474 if ((card->ext_csd.hs_max_dtr != 0) && 475 (host->caps & MMC_CAP_MMC_HIGHSPEED)) { 476 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 477 EXT_CSD_HS_TIMING, 1); 478 if (err && err != -EBADMSG) 479 goto free_card; 480 481 if (err) { 482 printk(KERN_WARNING "%s: switch to highspeed failed\n", 483 mmc_hostname(card->host)); 484 err = 0; 485 } else { 486 mmc_card_set_highspeed(card); 487 mmc_set_timing(card->host, MMC_TIMING_MMC_HS); 488 } 489 } 490 491 /* 492 * Compute bus speed. 493 */ 494 max_dtr = (unsigned int)-1; 495 496 if (mmc_card_highspeed(card)) { 497 if (max_dtr > card->ext_csd.hs_max_dtr) 498 max_dtr = card->ext_csd.hs_max_dtr; 499 } else if (max_dtr > card->csd.max_dtr) { 500 max_dtr = card->csd.max_dtr; 501 } 502 503 mmc_set_clock(host, max_dtr); 504 505 /* 506 * Activate wide bus (if supported). 507 */ 508 if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) && 509 (host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA))) { 510 unsigned ext_csd_bit, bus_width; 511 512 if (host->caps & MMC_CAP_8_BIT_DATA) { 513 ext_csd_bit = EXT_CSD_BUS_WIDTH_8; 514 bus_width = MMC_BUS_WIDTH_8; 515 } else { 516 ext_csd_bit = EXT_CSD_BUS_WIDTH_4; 517 bus_width = MMC_BUS_WIDTH_4; 518 } 519 520 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 521 EXT_CSD_BUS_WIDTH, ext_csd_bit); 522 523 if (err && err != -EBADMSG) 524 goto free_card; 525 526 if (err) { 527 printk(KERN_WARNING "%s: switch to bus width %d " 528 "failed\n", mmc_hostname(card->host), 529 1 << bus_width); 530 err = 0; 531 } else { 532 mmc_set_bus_width(card->host, bus_width); 533 } 534 } 535 536 if (!oldcard) 537 host->card = card; 538 539 return 0; 540 541free_card: 542 if (!oldcard) 543 mmc_remove_card(card); 544err: 545 546 return err; 547} 548 549/* 550 * Host is being removed. Free up the current card. 551 */ 552static void mmc_remove(struct mmc_host *host) 553{ 554 BUG_ON(!host); 555 BUG_ON(!host->card); 556 557 mmc_remove_card(host->card); 558 host->card = NULL; 559} 560 561/* 562 * Card detection callback from host. 563 */ 564static void mmc_detect(struct mmc_host *host) 565{ 566 int err; 567 568 BUG_ON(!host); 569 BUG_ON(!host->card); 570 571 mmc_claim_host(host); 572 573 /* 574 * Just check if our card has been removed. 575 */ 576 err = mmc_send_status(host->card, NULL); 577 578 mmc_release_host(host); 579 580 if (err) { 581 mmc_remove(host); 582 583 mmc_claim_host(host); 584 mmc_detach_bus(host); 585 mmc_release_host(host); 586 } 587} 588 589/* 590 * Suspend callback from host. 591 */ 592static int mmc_suspend(struct mmc_host *host) 593{ 594 BUG_ON(!host); 595 BUG_ON(!host->card); 596 597 mmc_claim_host(host); 598 if (!mmc_host_is_spi(host)) 599 mmc_deselect_cards(host); 600 host->card->state &= ~MMC_STATE_HIGHSPEED; 601 mmc_release_host(host); 602 603 return 0; 604} 605 606/* 607 * Resume callback from host. 608 * 609 * This function tries to determine if the same card is still present 610 * and, if so, restore all state to it. 611 */ 612static int mmc_resume(struct mmc_host *host) 613{ 614 int err; 615 616 BUG_ON(!host); 617 BUG_ON(!host->card); 618 619 mmc_claim_host(host); 620 err = mmc_init_card(host, host->ocr, host->card); 621 mmc_release_host(host); 622 623 return err; 624} 625 626static void mmc_power_restore(struct mmc_host *host) 627{ 628 host->card->state &= ~MMC_STATE_HIGHSPEED; 629 mmc_claim_host(host); 630 mmc_init_card(host, host->ocr, host->card); 631 mmc_release_host(host); 632} 633 634static int mmc_sleep(struct mmc_host *host) 635{ 636 struct mmc_card *card = host->card; 637 int err = -ENOSYS; 638 639 if (card && card->ext_csd.rev >= 3) { 640 err = mmc_card_sleepawake(host, 1); 641 if (err < 0) 642 pr_debug("%s: Error %d while putting card into sleep", 643 mmc_hostname(host), err); 644 } 645 646 return err; 647} 648 649static int mmc_awake(struct mmc_host *host) 650{ 651 struct mmc_card *card = host->card; 652 int err = -ENOSYS; 653 654 if (card && card->ext_csd.rev >= 3) { 655 err = mmc_card_sleepawake(host, 0); 656 if (err < 0) 657 pr_debug("%s: Error %d while awaking sleeping card", 658 mmc_hostname(host), err); 659 } 660 661 return err; 662} 663 664static const struct mmc_bus_ops mmc_ops = { 665 .awake = mmc_awake, 666 .sleep = mmc_sleep, 667 .remove = mmc_remove, 668 .detect = mmc_detect, 669 .suspend = NULL, 670 .resume = NULL, 671 .power_restore = mmc_power_restore, 672}; 673 674static const struct mmc_bus_ops mmc_ops_unsafe = { 675 .awake = mmc_awake, 676 .sleep = mmc_sleep, 677 .remove = mmc_remove, 678 .detect = mmc_detect, 679 .suspend = mmc_suspend, 680 .resume = mmc_resume, 681 .power_restore = mmc_power_restore, 682}; 683 684static void mmc_attach_bus_ops(struct mmc_host *host) 685{ 686 const struct mmc_bus_ops *bus_ops; 687 688 if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable) 689 bus_ops = &mmc_ops_unsafe; 690 else 691 bus_ops = &mmc_ops; 692 mmc_attach_bus(host, bus_ops); 693} 694 695/* 696 * Starting point for MMC card init. 697 */ 698int mmc_attach_mmc(struct mmc_host *host, u32 ocr) 699{ 700 int err; 701 702 BUG_ON(!host); 703 WARN_ON(!host->claimed); 704 705 mmc_attach_bus_ops(host); 706 707 /* 708 * We need to get OCR a different way for SPI. 709 */ 710 if (mmc_host_is_spi(host)) { 711 err = mmc_spi_read_ocr(host, 1, &ocr); 712 if (err) 713 goto err; 714 } 715 716 /* 717 * Sanity check the voltages that the card claims to 718 * support. 719 */ 720 if (ocr & 0x7F) { 721 printk(KERN_WARNING "%s: card claims to support voltages " 722 "below the defined range. These will be ignored.\n", 723 mmc_hostname(host)); 724 ocr &= ~0x7F; 725 } 726 727 host->ocr = mmc_select_voltage(host, ocr); 728 729 /* 730 * Can we support the voltage of the card? 731 */ 732 if (!host->ocr) { 733 err = -EINVAL; 734 goto err; 735 } 736 737 /* 738 * Detect and init the card. 739 */ 740 err = mmc_init_card(host, host->ocr, NULL); 741 if (err) 742 goto err; 743 744 mmc_release_host(host); 745 746 err = mmc_add_card(host->card); 747 if (err) 748 goto remove_card; 749 750 return 0; 751 752remove_card: 753 mmc_remove_card(host->card); 754 host->card = NULL; 755 mmc_claim_host(host); 756err: 757 mmc_detach_bus(host); 758 mmc_release_host(host); 759 760 printk(KERN_ERR "%s: error %d whilst initialising MMC card\n", 761 mmc_hostname(host), err); 762 763 return err; 764} 765