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authorPierre Ossman <drzeus@drzeus.cx>2006-12-30 18:11:32 -0500
committerPierre Ossman <drzeus@drzeus.cx>2007-05-01 07:41:06 -0400
commit7ea239d9e6d6993469a6a8ca83ff23834dfc3fce (patch)
tree40629c00e317ca8f4ce0a6394dcb4b7535e7b7ab
parentb2670b1c6ddd54be4a0f72f853122510ea5ef285 (diff)
mmc: add bus handler
Delegate protocol handling to "bus handlers". This allows the core to just handle the task of arbitrating the bus. Initialisation and pampering of cards is now done by the different bus handlers. This design also allows MMC and SD (and later SDIO) to be more cleanly separated, allowing easier maintenance. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat
-rw-r--r--drivers/mmc/core/Makefile2
-rw-r--r--drivers/mmc/core/core.c817
-rw-r--r--drivers/mmc/core/core.h37
-rw-r--r--drivers/mmc/core/mmc.c430
-rw-r--r--drivers/mmc/core/sd.c431
-rw-r--r--include/linux/mmc/host.h7
6 files changed, 1041 insertions, 683 deletions
diff --git a/drivers/mmc/core/Makefile b/drivers/mmc/core/Makefile
index 5977abf3e41b..1075b02ae754 100644
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -7,5 +7,5 @@ ifeq ($(CONFIG_MMC_DEBUG),y)
7endif 7endif
8 8
9obj-$(CONFIG_MMC) += mmc_core.o 9obj-$(CONFIG_MMC) += mmc_core.o
10mmc_core-y := core.o sysfs.o mmc_ops.o sd_ops.o 10mmc_core-y := core.o sysfs.o mmc.o mmc_ops.o sd.o sd_ops.o
11 11
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 310be2fe1944..75333a2461df 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -32,36 +32,8 @@
32#include "mmc_ops.h" 32#include "mmc_ops.h"
33#include "sd_ops.h" 33#include "sd_ops.h"
34 34
35#define CMD_RETRIES 3 35extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
36 36extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
37/*
38 * OCR Bit positions to 10s of Vdd mV.
39 */
40static const unsigned short mmc_ocr_bit_to_vdd[] = {
41 150, 155, 160, 165, 170, 180, 190, 200,
42 210, 220, 230, 240, 250, 260, 270, 280,
43 290, 300, 310, 320, 330, 340, 350, 360
44};
45
46static const unsigned int tran_exp[] = {
47 10000, 100000, 1000000, 10000000,
48 0, 0, 0, 0
49};
50
51static const unsigned char tran_mant[] = {
52 0, 10, 12, 13, 15, 20, 25, 30,
53 35, 40, 45, 50, 55, 60, 70, 80,
54};
55
56static const unsigned int tacc_exp[] = {
57 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
58};
59
60static const unsigned int tacc_mant[] = {
61 0, 10, 12, 13, 15, 20, 25, 30,
62 35, 40, 45, 50, 55, 60, 70, 80,
63};
64
65 37
66/** 38/**
67 * mmc_request_done - finish processing an MMC request 39 * mmc_request_done - finish processing an MMC request
@@ -303,6 +275,10 @@ void mmc_release_host(struct mmc_host *host)
303 275
304EXPORT_SYMBOL(mmc_release_host); 276EXPORT_SYMBOL(mmc_release_host);
305 277
278/*
279 * Internal function that does the actual ios call to the host driver,
280 * optionally printing some debug output.
281 */
306static inline void mmc_set_ios(struct mmc_host *host) 282static inline void mmc_set_ios(struct mmc_host *host)
307{ 283{
308 struct mmc_ios *ios = &host->ios; 284 struct mmc_ios *ios = &host->ios;
@@ -316,6 +292,9 @@ static inline void mmc_set_ios(struct mmc_host *host)
316 host->ops->set_ios(host, ios); 292 host->ops->set_ios(host, ios);
317} 293}
318 294
295/*
296 * Control chip select pin on a host.
297 */
319void mmc_set_chip_select(struct mmc_host *host, int mode) 298void mmc_set_chip_select(struct mmc_host *host, int mode)
320{ 299{
321 host->ios.chip_select = mode; 300 host->ios.chip_select = mode;
@@ -323,10 +302,43 @@ void mmc_set_chip_select(struct mmc_host *host, int mode)
323} 302}
324 303
325/* 304/*
305 * Sets the host clock to the highest possible frequency that
306 * is below "hz".
307 */
308void mmc_set_clock(struct mmc_host *host, unsigned int hz)
309{
310 WARN_ON(hz < host->f_min);
311
312 if (hz > host->f_max)
313 hz = host->f_max;
314
315 host->ios.clock = hz;
316 mmc_set_ios(host);
317}
318
319/*
320 * Change the bus mode (open drain/push-pull) of a host.
321 */
322void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
323{
324 host->ios.bus_mode = mode;
325 mmc_set_ios(host);
326}
327
328/*
329 * Change data bus width of a host.
330 */
331void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
332{
333 host->ios.bus_width = width;
334 mmc_set_ios(host);
335}
336
337/*
326 * Mask off any voltages we don't support and select 338 * Mask off any voltages we don't support and select
327 * the lowest voltage 339 * the lowest voltage
328 */ 340 */
329static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) 341u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
330{ 342{
331 int bit; 343 int bit;
332 344
@@ -347,235 +359,19 @@ static u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
347 return ocr; 359 return ocr;
348} 360}
349 361
350#define UNSTUFF_BITS(resp,start,size) \
351 ({ \
352 const int __size = size; \
353 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
354 const int __off = 3 - ((start) / 32); \
355 const int __shft = (start) & 31; \
356 u32 __res; \
357 \
358 __res = resp[__off] >> __shft; \
359 if (__size + __shft > 32) \
360 __res |= resp[__off-1] << ((32 - __shft) % 32); \
361 __res & __mask; \
362 })
363
364/*
365 * Given the decoded CSD structure, decode the raw CID to our CID structure.
366 */
367static void mmc_decode_cid(struct mmc_card *card)
368{
369 u32 *resp = card->raw_cid;
370
371 memset(&card->cid, 0, sizeof(struct mmc_cid));
372
373 if (mmc_card_sd(card)) {
374 /*
375 * SD doesn't currently have a version field so we will
376 * have to assume we can parse this.
377 */
378 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
379 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
380 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
381 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
382 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
383 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
384 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
385 card->cid.hwrev = UNSTUFF_BITS(resp, 60, 4);
386 card->cid.fwrev = UNSTUFF_BITS(resp, 56, 4);
387 card->cid.serial = UNSTUFF_BITS(resp, 24, 32);
388 card->cid.year = UNSTUFF_BITS(resp, 12, 8);
389 card->cid.month = UNSTUFF_BITS(resp, 8, 4);
390
391 card->cid.year += 2000; /* SD cards year offset */
392 } else {
393 /*
394 * The selection of the format here is based upon published
395 * specs from sandisk and from what people have reported.
396 */
397 switch (card->csd.mmca_vsn) {
398 case 0: /* MMC v1.0 - v1.2 */
399 case 1: /* MMC v1.4 */
400 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
401 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
402 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
403 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
404 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
405 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
406 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
407 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
408 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
409 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
410 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
411 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
412 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
413 break;
414
415 case 2: /* MMC v2.0 - v2.2 */
416 case 3: /* MMC v3.1 - v3.3 */
417 case 4: /* MMC v4 */
418 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
419 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
420 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
421 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
422 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
423 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
424 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
425 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
426 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
427 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
428 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
429 break;
430
431 default:
432 printk("%s: card has unknown MMCA version %d\n",
433 mmc_hostname(card->host), card->csd.mmca_vsn);
434 mmc_card_set_bad(card);
435 break;
436 }
437 }
438}
439
440/*
441 * Given a 128-bit response, decode to our card CSD structure.
442 */
443static void mmc_decode_csd(struct mmc_card *card)
444{
445 struct mmc_csd *csd = &card->csd;
446 unsigned int e, m, csd_struct;
447 u32 *resp = card->raw_csd;
448
449 if (mmc_card_sd(card)) {
450 csd_struct = UNSTUFF_BITS(resp, 126, 2);
451
452 switch (csd_struct) {
453 case 0:
454 m = UNSTUFF_BITS(resp, 115, 4);
455 e = UNSTUFF_BITS(resp, 112, 3);
456 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
457 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
458
459 m = UNSTUFF_BITS(resp, 99, 4);
460 e = UNSTUFF_BITS(resp, 96, 3);
461 csd->max_dtr = tran_exp[e] * tran_mant[m];
462 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
463
464 e = UNSTUFF_BITS(resp, 47, 3);
465 m = UNSTUFF_BITS(resp, 62, 12);
466 csd->capacity = (1 + m) << (e + 2);
467
468 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
469 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
470 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
471 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
472 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
473 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
474 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
475 break;
476 case 1:
477 /*
478 * This is a block-addressed SDHC card. Most
479 * interesting fields are unused and have fixed
480 * values. To avoid getting tripped by buggy cards,
481 * we assume those fixed values ourselves.
482 */
483 mmc_card_set_blockaddr(card);
484
485 csd->tacc_ns = 0; /* Unused */
486 csd->tacc_clks = 0; /* Unused */
487
488 m = UNSTUFF_BITS(resp, 99, 4);
489 e = UNSTUFF_BITS(resp, 96, 3);
490 csd->max_dtr = tran_exp[e] * tran_mant[m];
491 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
492
493 m = UNSTUFF_BITS(resp, 48, 22);
494 csd->capacity = (1 + m) << 10;
495
496 csd->read_blkbits = 9;
497 csd->read_partial = 0;
498 csd->write_misalign = 0;
499 csd->read_misalign = 0;
500 csd->r2w_factor = 4; /* Unused */
501 csd->write_blkbits = 9;
502 csd->write_partial = 0;
503 break;
504 default:
505 printk("%s: unrecognised CSD structure version %d\n",
506 mmc_hostname(card->host), csd_struct);
507 mmc_card_set_bad(card);
508 return;
509 }
510 } else {
511 /*
512 * We only understand CSD structure v1.1 and v1.2.
513 * v1.2 has extra information in bits 15, 11 and 10.
514 */
515 csd_struct = UNSTUFF_BITS(resp, 126, 2);
516 if (csd_struct != 1 && csd_struct != 2) {
517 printk("%s: unrecognised CSD structure version %d\n",
518 mmc_hostname(card->host), csd_struct);
519 mmc_card_set_bad(card);
520 return;
521 }
522
523 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
524 m = UNSTUFF_BITS(resp, 115, 4);
525 e = UNSTUFF_BITS(resp, 112, 3);
526 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
527 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
528
529 m = UNSTUFF_BITS(resp, 99, 4);
530 e = UNSTUFF_BITS(resp, 96, 3);
531 csd->max_dtr = tran_exp[e] * tran_mant[m];
532 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
533
534 e = UNSTUFF_BITS(resp, 47, 3);
535 m = UNSTUFF_BITS(resp, 62, 12);
536 csd->capacity = (1 + m) << (e + 2);
537
538 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
539 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
540 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
541 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
542 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
543 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
544 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
545 }
546}
547
548/* 362/*
549 * Given a 64-bit response, decode to our card SCR structure. 363 * Select timing parameters for host.
550 */ 364 */
551static void mmc_decode_scr(struct mmc_card *card) 365void mmc_set_timing(struct mmc_host *host, unsigned int timing)
552{ 366{
553 struct sd_scr *scr = &card->scr; 367 host->ios.timing = timing;
554 unsigned int scr_struct; 368 mmc_set_ios(host);
555 u32 resp[4];
556
557 BUG_ON(!mmc_card_sd(card));
558
559 resp[3] = card->raw_scr[1];
560 resp[2] = card->raw_scr[0];
561
562 scr_struct = UNSTUFF_BITS(resp, 60, 4);
563 if (scr_struct != 0) {
564 printk("%s: unrecognised SCR structure version %d\n",
565 mmc_hostname(card->host), scr_struct);
566 mmc_card_set_bad(card);
567 return;
568 }
569
570 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
571 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
572} 369}
573 370
574/* 371/*
575 * Allocate a new MMC card 372 * Allocate a new MMC card
576 */ 373 */
577static struct mmc_card * 374struct mmc_card *mmc_alloc_card(struct mmc_host *host)
578mmc_alloc_card(struct mmc_host *host, u32 *raw_cid)
579{ 375{
580 struct mmc_card *card; 376 struct mmc_card *card;
581 377
@@ -584,7 +380,6 @@ mmc_alloc_card(struct mmc_host *host, u32 *raw_cid)
584 return ERR_PTR(-ENOMEM); 380 return ERR_PTR(-ENOMEM);
585 381
586 mmc_init_card(card, host); 382 mmc_init_card(card, host);
587 memcpy(card->raw_cid, raw_cid, sizeof(card->raw_cid));
588 383
589 return card; 384 return card;
590} 385}
@@ -634,406 +429,66 @@ static void mmc_power_off(struct mmc_host *host)
634} 429}
635 430
636/* 431/*
637 * Discover the card by requesting its CID. 432 * Assign a mmc bus handler to a host. Only one bus handler may control a
638 * 433 * host at any given time.
639 * Create a mmc_card entry for the discovered card, assigning
640 * it an RCA, and save the raw CID for decoding later.
641 */ 434 */
642static void mmc_discover_card(struct mmc_host *host) 435void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
643{ 436{
644 unsigned int err; 437 unsigned long flags;
645 u32 cid[4];
646
647 BUG_ON(host->card);
648
649 err = mmc_all_send_cid(host, cid);
650 if (err != MMC_ERR_NONE) {
651 printk(KERN_ERR "%s: error requesting CID: %d\n",
652 mmc_hostname(host), err);
653 return;
654 }
655
656 host->card = mmc_alloc_card(host, cid);
657 if (IS_ERR(host->card)) {
658 err = PTR_ERR(host->card);
659 host->card = NULL;
660 return;
661 }
662
663 if (host->mode == MMC_MODE_SD) {
664 host->card->type = MMC_TYPE_SD;
665
666 err = mmc_send_relative_addr(host, &host->card->rca);
667 if (err != MMC_ERR_NONE)
668 mmc_card_set_dead(host->card);
669 else {
670 if (!host->ops->get_ro) {
671 printk(KERN_WARNING "%s: host does not "
672 "support reading read-only "
673 "switch. assuming write-enable.\n",
674 mmc_hostname(host));
675 } else {
676 if (host->ops->get_ro(host))
677 mmc_card_set_readonly(host->card);
678 }
679 }
680 } else {
681 host->card->type = MMC_TYPE_MMC;
682 host->card->rca = 1;
683
684 err = mmc_set_relative_addr(host->card);
685 if (err != MMC_ERR_NONE)
686 mmc_card_set_dead(host->card);
687 }
688}
689
690static void mmc_read_csd(struct mmc_host *host)
691{
692 int err;
693
694 if (!host->card)
695 return;
696 if (mmc_card_dead(host->card))
697 return;
698
699 err = mmc_send_csd(host->card, host->card->raw_csd);
700 if (err != MMC_ERR_NONE) {
701 mmc_card_set_dead(host->card);
702 return;
703 }
704
705 mmc_decode_csd(host->card);
706 mmc_decode_cid(host->card);
707}
708
709static void mmc_process_ext_csd(struct mmc_host *host)
710{
711 int err;
712 u8 *ext_csd;
713
714 if (!host->card)
715 return;
716 if (mmc_card_dead(host->card))
717 return;
718 if (mmc_card_sd(host->card))
719 return;
720 if (host->card->csd.mmca_vsn < CSD_SPEC_VER_4)
721 return;
722
723 /*
724 * As the ext_csd is so large and mostly unused, we don't store the
725 * raw block in mmc_card.
726 */
727 ext_csd = kmalloc(512, GFP_KERNEL);
728 if (!ext_csd) {
729 printk("%s: could not allocate a buffer to receive the ext_csd."
730 "mmc v4 cards will be treated as v3.\n",
731 mmc_hostname(host));
732 return;
733 }
734
735 err = mmc_send_ext_csd(host->card, ext_csd);
736 if (err != MMC_ERR_NONE) {
737 if (host->card->csd.capacity == (4096 * 512)) {
738 printk(KERN_ERR "%s: unable to read EXT_CSD "
739 "on a possible high capacity card. "
740 "Card will be ignored.\n",
741 mmc_hostname(host));
742 mmc_card_set_dead(host->card);
743 } else {
744 printk(KERN_WARNING "%s: unable to read "
745 "EXT_CSD, performance might "
746 "suffer.\n",
747 mmc_hostname(host));
748 }
749 goto out;
750 }
751
752 host->card->ext_csd.sectors =
753 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
754 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
755 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
756 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
757 if (host->card->ext_csd.sectors)
758 mmc_card_set_blockaddr(host->card);
759
760 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
761 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
762 host->card->ext_csd.hs_max_dtr = 52000000;
763 break;
764 case EXT_CSD_CARD_TYPE_26:
765 host->card->ext_csd.hs_max_dtr = 26000000;
766 break;
767 default:
768 /* MMC v4 spec says this cannot happen */
769 printk("%s: card is mmc v4 but doesn't support "
770 "any high-speed modes.\n",
771 mmc_hostname(host));
772 goto out;
773 }
774
775 if (host->caps & MMC_CAP_MMC_HIGHSPEED) {
776 /* Activate highspeed support. */
777 err = mmc_switch(host->card, MMC_SWITCH_MODE_WRITE_BYTE,
778 EXT_CSD_HS_TIMING, 1);
779 if (err != MMC_ERR_NONE) {
780 printk("%s: failed to switch card to mmc v4 "
781 "high-speed mode.\n",
782 mmc_hostname(host));
783 goto out;
784 }
785
786 mmc_card_set_highspeed(host->card);
787
788 host->ios.timing = MMC_TIMING_MMC_HS;
789 mmc_set_ios(host);
790 }
791 438
792 /* Check for host support for wide-bus modes. */ 439 BUG_ON(!host);
793 if (host->caps & MMC_CAP_4_BIT_DATA) { 440 BUG_ON(!ops);
794 /* Activate 4-bit support. */
795 err = mmc_switch(host->card, MMC_SWITCH_MODE_WRITE_BYTE,
796 EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4 |
797 EXT_CSD_CMD_SET_NORMAL);
798 if (err != MMC_ERR_NONE) {
799 printk("%s: failed to switch card to "
800 "mmc v4 4-bit bus mode.\n",
801 mmc_hostname(host));
802 goto out;
803 }
804 441
805 host->ios.bus_width = MMC_BUS_WIDTH_4; 442 BUG_ON(!host->claimed);
806 mmc_set_ios(host);
807 }
808 443
809out: 444 spin_lock_irqsave(&host->lock, flags);
810 kfree(ext_csd);
811}
812 445
813static void mmc_read_scr(struct mmc_host *host) 446 BUG_ON(host->bus_ops);
814{ 447 BUG_ON(host->bus_refs);
815 int err;
816 448
817 if (!host->card) 449 host->bus_ops = ops;
818 return; 450 host->bus_refs = 1;
819 if (mmc_card_dead(host->card)) 451 host->bus_dead = 0;
820 return;
821 if (!mmc_card_sd(host->card))
822 return;
823
824 err = mmc_app_send_scr(host->card, host->card->raw_scr);
825 if (err != MMC_ERR_NONE) {
826 mmc_card_set_dead(host->card);
827 return;
828 }
829 452
830 mmc_decode_scr(host->card); 453 spin_unlock_irqrestore(&host->lock, flags);
831} 454}
832 455
833static void mmc_read_switch_caps(struct mmc_host *host) 456/*
457 * Remove the current bus handler from a host. Assumes that there are
458 * no interesting cards left, so the bus is powered down.
459 */
460void mmc_detach_bus(struct mmc_host *host)
834{ 461{
835 int err; 462 unsigned long flags;
836 unsigned char *status;
837
838 if (!(host->caps & MMC_CAP_SD_HIGHSPEED))
839 return;
840
841 if (!host->card)
842 return;
843 if (mmc_card_dead(host->card))
844 return;
845 if (!mmc_card_sd(host->card))
846 return;
847 if (host->card->scr.sda_vsn < SCR_SPEC_VER_1)
848 return;
849
850 status = kmalloc(64, GFP_KERNEL);
851 if (!status) {
852 printk(KERN_WARNING "%s: Unable to allocate buffer for "
853 "reading switch capabilities.\n",
854 mmc_hostname(host));
855 return;
856 }
857
858 err = mmc_sd_switch(host->card, SD_SWITCH_CHECK,
859 SD_SWITCH_GRP_ACCESS, SD_SWITCH_ACCESS_HS, status);
860 if (err != MMC_ERR_NONE) {
861 printk("%s: unable to read switch capabilities, "
862 "performance might suffer.\n",
863 mmc_hostname(host));
864 goto out;
865 }
866
867 if (status[13] & 0x02)
868 host->card->sw_caps.hs_max_dtr = 50000000;
869 463
870 err = mmc_sd_switch(host->card, SD_SWITCH_SET, 464 BUG_ON(!host);
871 SD_SWITCH_GRP_ACCESS, SD_SWITCH_ACCESS_HS, status);
872 if (err != MMC_ERR_NONE || (status[16] & 0xF) != 1) {
873 printk(KERN_WARNING "%s: Problem switching card "
874 "into high-speed mode!\n",
875 mmc_hostname(host));
876 goto out;
877 }
878 465
879 mmc_card_set_highspeed(host->card); 466 BUG_ON(!host->claimed);
467 BUG_ON(!host->bus_ops);
880 468
881 host->ios.timing = MMC_TIMING_SD_HS; 469 spin_lock_irqsave(&host->lock, flags);
882 mmc_set_ios(host);
883 470
884out: 471 host->bus_dead = 1;
885 kfree(status);
886}
887 472
888static unsigned int mmc_calculate_clock(struct mmc_host *host) 473 spin_unlock_irqrestore(&host->lock, flags);
889{
890 unsigned int max_dtr = host->f_max;
891
892 if (host->card && !mmc_card_dead(host->card)) {
893 if (mmc_card_highspeed(host->card) && mmc_card_sd(host->card)) {
894 if (max_dtr > host->card->sw_caps.hs_max_dtr)
895 max_dtr = host->card->sw_caps.hs_max_dtr;
896 } else if (mmc_card_highspeed(host->card) && !mmc_card_sd(host->card)) {
897 if (max_dtr > host->card->ext_csd.hs_max_dtr)
898 max_dtr = host->card->ext_csd.hs_max_dtr;
899 } else if (max_dtr > host->card->csd.max_dtr) {
900 max_dtr = host->card->csd.max_dtr;
901 }
902 }
903 474
904 pr_debug("%s: selected %d.%03dMHz transfer rate\n", 475 mmc_power_off(host);
905 mmc_hostname(host),
906 max_dtr / 1000000, (max_dtr / 1000) % 1000);
907 476
908 return max_dtr; 477 mmc_bus_put(host);
909} 478}
910 479
911/* 480/*
912 * Check whether cards we already know about are still present. 481 * Cleanup when the last reference to the bus operator is dropped.
913 * We do this by requesting status, and checking whether a card
914 * responds.
915 *
916 * A request for status does not cause a state change in data
917 * transfer mode.
918 */ 482 */
919static void mmc_check_card(struct mmc_card *card) 483void __mmc_release_bus(struct mmc_host *host)
920{ 484{
921 int err; 485 BUG_ON(!host);
922 486 BUG_ON(host->bus_refs);
923 BUG_ON(!card); 487 BUG_ON(!host->bus_dead);
924 488
925 err = mmc_send_status(card, NULL); 489 host->bus_ops = NULL;
926 if (err == MMC_ERR_NONE)
927 return;
928
929 mmc_card_set_dead(card);
930} 490}
931 491
932static void mmc_setup(struct mmc_host *host)
933{
934 int err;
935 u32 ocr;
936
937 host->mode = MMC_MODE_SD;
938
939 mmc_power_up(host);
940 mmc_go_idle(host);
941
942 err = mmc_send_if_cond(host, host->ocr_avail);
943 if (err != MMC_ERR_NONE) {
944 return;
945 }
946 err = mmc_send_app_op_cond(host, 0, &ocr);
947
948 /*
949 * If we fail to detect any SD cards then try
950 * searching for MMC cards.
951 */
952 if (err != MMC_ERR_NONE) {
953 host->mode = MMC_MODE_MMC;
954
955 err = mmc_send_op_cond(host, 0, &ocr);
956 if (err != MMC_ERR_NONE)
957 return;
958 }
959
960 host->ocr = mmc_select_voltage(host, ocr);
961
962 if (host->ocr == 0)
963 return;
964
965 /*
966 * Since we're changing the OCR value, we seem to
967 * need to tell some cards to go back to the idle
968 * state. We wait 1ms to give cards time to
969 * respond.
970 */
971 mmc_go_idle(host);
972
973 /*
974 * Send the selected OCR multiple times... until the cards
975 * all get the idea that they should be ready for CMD2.
976 * (My SanDisk card seems to need this.)
977 */
978 if (host->mode == MMC_MODE_SD) {
979 /*
980 * If SD_SEND_IF_COND indicates an SD 2.0
981 * compliant card and we should set bit 30
982 * of the ocr to indicate that we can handle
983 * block-addressed SDHC cards.
984 */
985 err = mmc_send_if_cond(host, host->ocr);
986 if (err == MMC_ERR_NONE)
987 ocr = host->ocr | (1 << 30);
988
989 mmc_send_app_op_cond(host, ocr, NULL);
990 } else {
991 /* The extra bit indicates that we support high capacity */
992 mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
993 }
994
995 mmc_discover_card(host);
996
997 /*
998 * Ok, now switch to push-pull mode.
999 */
1000 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1001 mmc_set_ios(host);
1002
1003 mmc_read_csd(host);
1004
1005 if (host->card && !mmc_card_dead(host->card)) {
1006 err = mmc_select_card(host->card);
1007 if (err != MMC_ERR_NONE)
1008 mmc_card_set_dead(host->card);
1009 }
1010
1011 /*
1012 * The card is in 1 bit mode by default so
1013 * we only need to change if it supports the
1014 * wider version.
1015 */
1016 if (host->card && !mmc_card_dead(host->card) &&
1017 mmc_card_sd(host->card) &&
1018 (host->card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) &&
1019 (host->card->host->caps & MMC_CAP_4_BIT_DATA)) {
1020 err = mmc_app_set_bus_width(host->card, SD_BUS_WIDTH_4);
1021 if (err != MMC_ERR_NONE)
1022 mmc_card_set_dead(host->card);
1023 else {
1024 host->ios.bus_width = MMC_BUS_WIDTH_4;
1025 mmc_set_ios(host);
1026 }
1027 }
1028
1029 if (host->mode == MMC_MODE_SD) {
1030 mmc_read_scr(host);
1031 mmc_read_switch_caps(host);
1032 } else
1033 mmc_process_ext_csd(host);
1034}
1035
1036
1037/** 492/**
1038 * mmc_detect_change - process change of state on a MMC socket 493 * mmc_detect_change - process change of state on a MMC socket
1039 * @host: host which changed state. 494 * @host: host which changed state.
@@ -1060,62 +515,49 @@ static void mmc_rescan(struct work_struct *work)
1060{ 515{
1061 struct mmc_host *host = 516 struct mmc_host *host =
1062 container_of(work, struct mmc_host, detect.work); 517 container_of(work, struct mmc_host, detect.work);
518 u32 ocr;
519 int err;
1063 520
1064 mmc_claim_host(host); 521 mmc_bus_get(host);
1065
1066 /*
1067 * Check for removed card and newly inserted ones. We check for
1068 * removed cards first so we can intelligently re-select the VDD.
1069 */
1070 if (host->card) {
1071 mmc_check_card(host->card);
1072
1073 mmc_release_host(host);
1074
1075 if (mmc_card_dead(host->card)) {
1076 mmc_remove_card(host->card);
1077 host->card = NULL;
1078 }
1079
1080 goto out;
1081 }
1082
1083 mmc_setup(host);
1084 522
1085 if (host->card && !mmc_card_dead(host->card)) { 523 if (host->bus_ops == NULL) {
1086 /* 524 /*
1087 * (Re-)calculate the fastest clock rate which the 525 * Only we can add a new handler, so it's safe to
1088 * attached cards and the host support. 526 * release the lock here.
1089 */ 527 */
1090 host->ios.clock = mmc_calculate_clock(host); 528 mmc_bus_put(host);
1091 mmc_set_ios(host);
1092 }
1093 529
1094 mmc_release_host(host); 530 mmc_claim_host(host);
1095 531
1096 /* 532 mmc_power_up(host);
1097 * If this is a new and good card, register it. 533 mmc_go_idle(host);
1098 */
1099 if (host->card && !mmc_card_dead(host->card)) {
1100 if (mmc_register_card(host->card))
1101 mmc_card_set_dead(host->card);
1102 }
1103 534
1104 /* 535 mmc_send_if_cond(host, host->ocr_avail);
1105 * If this card is dead, destroy it.
1106 */
1107 if (host->card && mmc_card_dead(host->card)) {
1108 mmc_remove_card(host->card);
1109 host->card = NULL;
1110 }
1111 536
1112out: 537 err = mmc_send_app_op_cond(host, 0, &ocr);
1113 /* 538 if (err == MMC_ERR_NONE) {
1114 * If we discover that there are no cards on the 539 if (mmc_attach_sd(host, ocr))
1115 * bus, turn off the clock and power down. 540 mmc_power_off(host);
1116 */ 541 } else {
1117 if (!host->card) 542 /*
1118 mmc_power_off(host); 543 * If we fail to detect any SD cards then try
544 * searching for MMC cards.
545 */
546 err = mmc_send_op_cond(host, 0, &ocr);
547 if (err == MMC_ERR_NONE) {
548 if (mmc_attach_mmc(host, ocr))
549 mmc_power_off(host);
550 } else {
551 mmc_power_off(host);
552 mmc_release_host(host);
553 }
554 }
555 } else {
556 if (host->bus_ops->detect && !host->bus_dead)
557 host->bus_ops->detect(host);
558
559 mmc_bus_put(host);
560 }
1119} 561}
1120 562
1121 563
@@ -1190,10 +632,18 @@ void mmc_remove_host(struct mmc_host *host)
1190 632
1191 mmc_flush_scheduled_work(); 633 mmc_flush_scheduled_work();
1192 634
1193 if (host->card) { 635 mmc_bus_get(host);
1194 mmc_remove_card(host->card); 636 if (host->bus_ops && !host->bus_dead) {
1195 host->card = NULL; 637 if (host->bus_ops->remove)
638 host->bus_ops->remove(host);
639
640 mmc_claim_host(host);
641 mmc_detach_bus(host);
642 mmc_release_host(host);
1196 } 643 }
644 mmc_bus_put(host);
645
646 BUG_ON(host->card);
1197 647
1198 mmc_power_off(host); 648 mmc_power_off(host);
1199 mmc_remove_host_sysfs(host); 649 mmc_remove_host_sysfs(host);
@@ -1225,10 +675,15 @@ int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1225{ 675{
1226 mmc_flush_scheduled_work(); 676 mmc_flush_scheduled_work();
1227 677
1228 if (host->card) { 678 mmc_bus_get(host);
1229 mmc_remove_card(host->card); 679 if (host->bus_ops && !host->bus_dead) {
1230 host->card = NULL; 680 if (host->bus_ops->remove)
681 host->bus_ops->remove(host);
682 mmc_detach_bus(host);
1231 } 683 }
684 mmc_bus_put(host);
685
686 BUG_ON(host->card);
1232 687
1233 mmc_power_off(host); 688 mmc_power_off(host);
1234 689
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 1c1066342fba..fad8edc38099 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -15,7 +15,44 @@
15 15
16#define MMC_CMD_RETRIES 3 16#define MMC_CMD_RETRIES 3
17 17
18struct mmc_bus_ops {
19 void (*remove)(struct mmc_host *);
20 void (*detect)(struct mmc_host *);
21};
22
23void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
24void mmc_detach_bus(struct mmc_host *host);
25
26void __mmc_release_bus(struct mmc_host *host);
27
28static inline void mmc_bus_get(struct mmc_host *host)
29{
30 unsigned long flags;
31
32 spin_lock_irqsave(&host->lock, flags);
33 host->bus_refs++;
34 spin_unlock_irqrestore(&host->lock, flags);
35}
36
37static inline void mmc_bus_put(struct mmc_host *host)
38{
39 unsigned long flags;
40
41 spin_lock_irqsave(&host->lock, flags);
42 host->bus_refs--;
43 if ((host->bus_refs == 0) && host->bus_ops)
44 __mmc_release_bus(host);
45 spin_unlock_irqrestore(&host->lock, flags);
46}
47
18void mmc_set_chip_select(struct mmc_host *host, int mode); 48void mmc_set_chip_select(struct mmc_host *host, int mode);
49void mmc_set_clock(struct mmc_host *host, unsigned int hz);
50void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
51void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
52u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
53void mmc_set_timing(struct mmc_host *host, unsigned int timing);
54
55struct mmc_card *mmc_alloc_card(struct mmc_host *host);
19 56
20static inline void mmc_delay(unsigned int ms) 57static inline void mmc_delay(unsigned int ms)
21{ 58{
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
new file mode 100644
index 000000000000..c528017d6128
--- /dev/null
+++ b/drivers/mmc/core/mmc.c
@@ -0,0 +1,430 @@
1/*
2 * linux/drivers/mmc/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
15#include <linux/mmc/host.h>
16#include <linux/mmc/card.h>
17#include <linux/mmc/mmc.h>
18
19#include "core.h"
20#include "sysfs.h"
21#include "mmc_ops.h"
22
23static const unsigned int tran_exp[] = {
24 10000, 100000, 1000000, 10000000,
25 0, 0, 0, 0
26};
27
28static const unsigned char tran_mant[] = {
29 0, 10, 12, 13, 15, 20, 25, 30,
30 35, 40, 45, 50, 55, 60, 70, 80,
31};
32
33static const unsigned int tacc_exp[] = {
34 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
35};
36
37static const unsigned int tacc_mant[] = {
38 0, 10, 12, 13, 15, 20, 25, 30,
39 35, 40, 45, 50, 55, 60, 70, 80,
40};
41
42#define UNSTUFF_BITS(resp,start,size) \
43 ({ \
44 const int __size = size; \
45 const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
46 const int __off = 3 - ((start) / 32); \
47 const int __shft = (start) & 31; \
48 u32 __res; \
49 \
50 __res = resp[__off] >> __shft; \
51 if (__size + __shft > 32) \
52 __res |= resp[__off-1] << ((32 - __shft) % 32); \
53 __res & __mask; \
54 })
55
56/*
57 * Given the decoded CSD structure, decode the raw CID to our CID structure.
58 */
59static void mmc_decode_cid(struct mmc_card *card)
60{
61 u32 *resp = card->raw_cid;
62
63 /*
64 * The selection of the format here is based upon published
65 * specs from sandisk and from what people have reported.
66 */
67 switch (card->csd.mmca_vsn) {
68 case 0: /* MMC v1.0 - v1.2 */
69 case 1: /* MMC v1.4 */
70 card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
71 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
72 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
73 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
74 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
75 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
76 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
77 card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
78 card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
79 card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
80 card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
81 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
82 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
83 break;
84
85 case 2: /* MMC v2.0 - v2.2 */
86 case 3: /* MMC v3.1 - v3.3 */
87 case 4: /* MMC v4 */
88 card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
89 card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
90 card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
91 card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
92 card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
93 card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
94 card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
95 card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
96 card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
97 card->cid.month = UNSTUFF_BITS(resp, 12, 4);
98 card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
99 break;
100
101 default:
102 printk("%s: card has unknown MMCA version %d\n",
103 mmc_hostname(card->host), card->csd.mmca_vsn);
104 mmc_card_set_bad(card);
105 break;
106 }
107}
108
109/*
110 * Given a 128-bit response, decode to our card CSD structure.
111 */
112static void mmc_decode_csd(struct mmc_card *card)
113{
114 struct mmc_csd *csd = &card->csd;
115 unsigned int e, m, csd_struct;
116 u32 *resp = card->raw_csd;
117
118 /*
119 * We only understand CSD structure v1.1 and v1.2.
120 * v1.2 has extra information in bits 15, 11 and 10.
121 */
122 csd_struct = UNSTUFF_BITS(resp, 126, 2);
123 if (csd_struct != 1 && csd_struct != 2) {
124 printk("%s: unrecognised CSD structure version %d\n",
125 mmc_hostname(card->host), csd_struct);
126 mmc_card_set_bad(card);
127 return;
128 }
129
130 csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
131 m = UNSTUFF_BITS(resp, 115, 4);
132 e = UNSTUFF_BITS(resp, 112, 3);
133 csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
134 csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
135
136 m = UNSTUFF_BITS(resp, 99, 4);
137 e = UNSTUFF_BITS(resp, 96, 3);
138 csd->max_dtr = tran_exp[e] * tran_mant[m];
139 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
140
141 e = UNSTUFF_BITS(resp, 47, 3);
142 m = UNSTUFF_BITS(resp, 62, 12);
143 csd->capacity = (1 + m) << (e + 2);
144
145 csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
146 csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
147 csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
148 csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
149 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
150 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
151 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
152}
153
154/*
155 * Read and decode extended CSD. Switch to high-speed and wide bus
156 * if supported.
157 */
158static int mmc_process_ext_csd(struct mmc_card *card)
159{
160 int err;
161 u8 *ext_csd;
162
163 BUG_ON(!card);
164
165 err = MMC_ERR_FAILED;
166
167 if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
168 return MMC_ERR_NONE;
169
170 /*
171 * As the ext_csd is so large and mostly unused, we don't store the
172 * raw block in mmc_card.
173 */
174 ext_csd = kmalloc(512, GFP_KERNEL);
175 if (!ext_csd) {
176 printk(KERN_ERR "%s: could not allocate a buffer to "
177 "receive the ext_csd. mmc v4 cards will be "
178 "treated as v3.\n", mmc_hostname(card->host));
179 return MMC_ERR_FAILED;
180 }
181
182 err = mmc_send_ext_csd(card, ext_csd);
183 if (err != MMC_ERR_NONE) {
184 /*
185 * High capacity cards should have this "magic" size
186 * stored in their CSD.
187 */
188 if (card->csd.capacity == (4096 * 512)) {
189 printk(KERN_ERR "%s: unable to read EXT_CSD "
190 "on a possible high capacity card. "
191 "Card will be ignored.\n",
192 mmc_hostname(card->host));
193 } else {
194 printk(KERN_WARNING "%s: unable to read "
195 "EXT_CSD, performance might "
196 "suffer.\n",
197 mmc_hostname(card->host));
198 err = MMC_ERR_NONE;
199 }
200 goto out;
201 }
202
203 card->ext_csd.sectors =
204 ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
205 ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
206 ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
207 ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
208 if (card->ext_csd.sectors)
209 mmc_card_set_blockaddr(card);
210
211 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
212 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
213 card->ext_csd.hs_max_dtr = 52000000;
214 break;
215 case EXT_CSD_CARD_TYPE_26:
216 card->ext_csd.hs_max_dtr = 26000000;
217 break;
218 default:
219 /* MMC v4 spec says this cannot happen */
220 printk(KERN_WARNING "%s: card is mmc v4 but doesn't "
221 "support any high-speed modes.\n",
222 mmc_hostname(card->host));
223 goto out;
224 }
225
226 if (card->host->caps & MMC_CAP_MMC_HIGHSPEED) {
227 /* Activate highspeed support. */
228 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
229 EXT_CSD_HS_TIMING, 1);
230 if (err != MMC_ERR_NONE) {
231 printk(KERN_WARNING "%s: failed to switch "
232 "card to mmc v4 high-speed mode.\n",
233 mmc_hostname(card->host));
234 err = MMC_ERR_NONE;
235 goto out;
236 }
237
238 mmc_card_set_highspeed(card);
239
240 mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
241 }
242
243 /* Check for host support for wide-bus modes. */
244 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
245 /* Activate 4-bit support. */
246 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
247 EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
248 if (err != MMC_ERR_NONE) {
249 printk(KERN_WARNING "%s: failed to switch "
250 "card to mmc v4 4-bit bus mode.\n",
251 mmc_hostname(card->host));
252 err = MMC_ERR_NONE;
253 goto out;
254 }
255
256 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
257 }
258
259out:
260 kfree(ext_csd);
261
262 return err;
263}
264
265/*
266 * Host is being removed. Free up the current card.
267 */
268static void mmc_remove(struct mmc_host *host)
269{
270 BUG_ON(!host);
271 BUG_ON(!host->card);
272
273 mmc_remove_card(host->card);
274 host->card = NULL;
275}
276
277/*
278 * Card detection callback from host.
279 */
280static void mmc_detect(struct mmc_host *host)
281{
282 int err;
283
284 BUG_ON(!host);
285 BUG_ON(!host->card);
286
287 mmc_claim_host(host);
288
289 /*
290 * Just check if our card has been removed.
291 */
292 err = mmc_send_status(host->card, NULL);
293
294 mmc_release_host(host);
295
296 if (err != MMC_ERR_NONE) {
297 mmc_remove_card(host->card);
298 host->card = NULL;
299
300 mmc_claim_host(host);
301 mmc_detach_bus(host);
302 mmc_release_host(host);
303 }
304}
305
306static const struct mmc_bus_ops mmc_ops = {
307 .remove = mmc_remove,
308 .detect = mmc_detect,
309};
310
311/*
312 * Starting point for MMC card init.
313 */
314int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
315{
316 struct mmc_card *card;
317 int err;
318 u32 cid[4];
319 unsigned int max_dtr;
320
321 BUG_ON(!host);
322 BUG_ON(!host->claimed);
323
324 mmc_attach_bus(host, &mmc_ops);
325
326 host->ocr = mmc_select_voltage(host, ocr);
327
328 /*
329 * Can we support the voltage of the card?
330 */
331 if (!host->ocr)
332 goto err;
333
334 /*
335 * Since we're changing the OCR value, we seem to
336 * need to tell some cards to go back to the idle
337 * state. We wait 1ms to give cards time to
338 * respond.
339 */
340 mmc_go_idle(host);
341
342 /* The extra bit indicates that we support high capacity */
343 mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
344
345 /*
346 * Fetch CID from card.
347 */
348 err = mmc_all_send_cid(host, cid);
349 if (err != MMC_ERR_NONE)
350 goto err;
351
352 /*
353 * Allocate card structure.
354 */
355 card = mmc_alloc_card(host);
356 if (IS_ERR(card))
357 goto err;
358
359 card->type = MMC_TYPE_MMC;
360 card->rca = 1;
361 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
362
363 /*
364 * Set card RCA.
365 */
366 err = mmc_set_relative_addr(card);
367 if (err != MMC_ERR_NONE)
368 goto free_card;
369
370 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
371
372 /*
373 * Fetch CSD from card.
374 */
375 err = mmc_send_csd(card, card->raw_csd);
376 if (err != MMC_ERR_NONE)
377 goto free_card;
378
379 mmc_decode_csd(card);
380 mmc_decode_cid(card);
381
382 /*
383 * Fetch and process extened CSD.
384 * This will switch into high-speed and wide bus modes,
385 * as available.
386 */
387 err = mmc_select_card(card);
388 if (err != MMC_ERR_NONE)
389 goto free_card;
390
391 err = mmc_process_ext_csd(card);
392 if (err != MMC_ERR_NONE)
393 goto free_card;
394
395 /*
396 * Compute bus speed.
397 */
398 max_dtr = (unsigned int)-1;
399
400 if (mmc_card_highspeed(card)) {
401 if (max_dtr > card->ext_csd.hs_max_dtr)
402 max_dtr = card->ext_csd.hs_max_dtr;
403 } else if (max_dtr > card->csd.max_dtr) {
404 max_dtr = card->csd.max_dtr;
405 }
406
407 mmc_set_clock(host, max_dtr);
408
409 host->card = card;
410
411 mmc_release_host(host);
412
413 err = mmc_register_card(card);
414 if (err)
415 goto reclaim_host;
416
417 return 0;
418
419reclaim_host:
420 mmc_claim_host(host);
421free_card:
422 mmc_remove_card(card);
423 host->card = NULL;
424err:
425 mmc_detach_bus(host);
426 mmc_release_host(host);
427
428 return 0;
429}
430
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
new file mode 100644
index 000000000000..6c6beb48f3a8
--- /dev/null
+++ b/drivers/mmc/core/sd.c
@@ -0,0 +1,431 @@
1/*
2 * linux/drivers/mmc/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
15#include <linux/mmc/host.h>
16#include <linux/mmc/card.h>
17#include <linux/mmc/mmc.h>
18
19#include "core.h"
20#include "sysfs.h"
21#include "mmc_ops.h"
22#include "sd_ops.h"
23
24#include "core.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 */
62static void 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 void 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 break;
123 case 1:
124 /*
125 * This is a block-addressed SDHC card. Most
126 * interesting fields are unused and have fixed
127 * values. To avoid getting tripped by buggy cards,
128 * we assume those fixed values ourselves.
129 */
130 mmc_card_set_blockaddr(card);
131
132 csd->tacc_ns = 0; /* Unused */
133 csd->tacc_clks = 0; /* Unused */
134
135 m = UNSTUFF_BITS(resp, 99, 4);
136 e = UNSTUFF_BITS(resp, 96, 3);
137 csd->max_dtr = tran_exp[e] * tran_mant[m];
138 csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
139
140 m = UNSTUFF_BITS(resp, 48, 22);
141 csd->capacity = (1 + m) << 10;
142
143 csd->read_blkbits = 9;
144 csd->read_partial = 0;
145 csd->write_misalign = 0;
146 csd->read_misalign = 0;
147 csd->r2w_factor = 4; /* Unused */
148 csd->write_blkbits = 9;
149 csd->write_partial = 0;
150 break;
151 default:
152 printk("%s: unrecognised CSD structure version %d\n",
153 mmc_hostname(card->host), csd_struct);
154 mmc_card_set_bad(card);
155 return;
156 }
157}
158
159/*
160 * Given a 64-bit response, decode to our card SCR structure.
161 */
162static void mmc_decode_scr(struct mmc_card *card)
163{
164 struct sd_scr *scr = &card->scr;
165 unsigned int scr_struct;
166 u32 resp[4];
167
168 BUG_ON(!mmc_card_sd(card));
169
170 resp[3] = card->raw_scr[1];
171 resp[2] = card->raw_scr[0];
172
173 scr_struct = UNSTUFF_BITS(resp, 60, 4);
174 if (scr_struct != 0) {
175 printk("%s: unrecognised SCR structure version %d\n",
176 mmc_hostname(card->host), scr_struct);
177 mmc_card_set_bad(card);
178 return;
179 }
180
181 scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
182 scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
183}
184
185/*
186 * Test if the card supports high-speed mode and, if so, switch to it.
187 */
188static int mmc_switch_hs(struct mmc_card *card)
189{
190 int err;
191 u8 *status;
192
193 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
194 return MMC_ERR_NONE;
195
196 err = MMC_ERR_FAILED;
197
198 status = kmalloc(64, GFP_KERNEL);
199 if (!status) {
200 printk("%s: could not allocate a buffer for switch "
201 "capabilities.\n",
202 mmc_hostname(card->host));
203 return err;
204 }
205
206 err = mmc_sd_switch(card, 0, 0, 1, status);
207 if (err != MMC_ERR_NONE) {
208 /*
209 * Card not supporting high-speed will ignore the
210 * command.
211 */
212 if (err == MMC_ERR_TIMEOUT)
213 err = MMC_ERR_NONE;
214 goto out;
215 }
216
217 if (status[13] & 0x02)
218 card->sw_caps.hs_max_dtr = 50000000;
219
220 err = mmc_sd_switch(card, 1, 0, 1, status);
221 if (err != MMC_ERR_NONE)
222 goto out;
223
224 if ((status[16] & 0xF) != 1) {
225 printk(KERN_WARNING "%s: Problem switching card "
226 "into high-speed mode!\n",
227 mmc_hostname(card->host));
228 } else {
229 mmc_card_set_highspeed(card);
230 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
231 }
232
233out:
234 kfree(status);
235
236 return err;
237}
238
239/*
240 * Host is being removed. Free up the current card.
241 */
242static void mmc_sd_remove(struct mmc_host *host)
243{
244 BUG_ON(!host);
245 BUG_ON(!host->card);
246
247 mmc_remove_card(host->card);
248 host->card = NULL;
249}
250
251/*
252 * Card detection callback from host.
253 */
254static void mmc_sd_detect(struct mmc_host *host)
255{
256 int err;
257
258 BUG_ON(!host);
259 BUG_ON(!host->card);
260
261 mmc_claim_host(host);
262
263 /*
264 * Just check if our card has been removed.
265 */
266 err = mmc_send_status(host->card, NULL);
267
268 mmc_release_host(host);
269
270 if (err != MMC_ERR_NONE) {
271 mmc_remove_card(host->card);
272 host->card = NULL;
273
274 mmc_claim_host(host);
275 mmc_detach_bus(host);
276 mmc_release_host(host);
277 }
278}
279
280static const struct mmc_bus_ops mmc_sd_ops = {
281 .remove = mmc_sd_remove,
282 .detect = mmc_sd_detect,
283};
284
285/*
286 * Starting point for SD card init.
287 */
288int mmc_attach_sd(struct mmc_host *host, u32 ocr)
289{
290 struct mmc_card *card;
291 int err;
292 u32 cid[4];
293 unsigned int max_dtr;
294
295 BUG_ON(!host);
296 BUG_ON(!host->claimed);
297
298 mmc_attach_bus(host, &mmc_sd_ops);
299
300 host->ocr = mmc_select_voltage(host, ocr);
301
302 /*
303 * Can we support the voltage(s) of the card(s)?
304 */
305 if (!host->ocr)
306 goto err;
307
308 /*
309 * Since we're changing the OCR value, we seem to
310 * need to tell some cards to go back to the idle
311 * state. We wait 1ms to give cards time to
312 * respond.
313 */
314 mmc_go_idle(host);
315
316 /*
317 * If SD_SEND_IF_COND indicates an SD 2.0
318 * compliant card and we should set bit 30
319 * of the ocr to indicate that we can handle
320 * block-addressed SDHC cards.
321 */
322 err = mmc_send_if_cond(host, host->ocr);
323 if (err == MMC_ERR_NONE)
324 ocr = host->ocr | (1 << 30);
325
326 mmc_send_app_op_cond(host, ocr, NULL);
327
328 /*
329 * Fetch CID from card.
330 */
331 err = mmc_all_send_cid(host, cid);
332 if (err != MMC_ERR_NONE)
333 goto err;
334
335 /*
336 * Allocate card structure.
337 */
338 card = mmc_alloc_card(host);
339 if (IS_ERR(card))
340 goto err;
341
342 card->type = MMC_TYPE_SD;
343 memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
344
345 /*
346 * Set card RCA.
347 */
348 err = mmc_send_relative_addr(host, &card->rca);
349 if (err != MMC_ERR_NONE)
350 goto free_card;
351
352 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
353
354 /*
355 * Fetch CSD from card.
356 */
357 err = mmc_send_csd(card, card->raw_csd);
358 if (err != MMC_ERR_NONE)
359 goto free_card;
360
361 mmc_decode_csd(card);
362 mmc_decode_cid(card);
363
364 /*
365 * Fetch SCR from card.
366 */
367 err = mmc_select_card(card);
368 if (err != MMC_ERR_NONE)
369 goto free_card;
370
371 err = mmc_app_send_scr(card, card->raw_scr);
372 if (err != MMC_ERR_NONE)
373 goto free_card;
374
375 mmc_decode_scr(card);
376
377 /*
378 * Check if card can be switched into high-speed mode.
379 */
380 err = mmc_switch_hs(card);
381 if (err != MMC_ERR_NONE)
382 goto free_card;
383
384 /*
385 * Compute bus speed.
386 */
387 max_dtr = (unsigned int)-1;
388
389 if (mmc_card_highspeed(card)) {
390 if (max_dtr > card->sw_caps.hs_max_dtr)
391 max_dtr = card->sw_caps.hs_max_dtr;
392 } else if (max_dtr > card->csd.max_dtr) {
393 max_dtr = card->csd.max_dtr;
394 }
395
396 mmc_set_clock(host, max_dtr);
397
398 /*
399 * Switch to wider bus (if supported).
400 */
401 if ((host->caps && MMC_CAP_4_BIT_DATA) &&
402 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
403 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
404 if (err != MMC_ERR_NONE)
405 goto free_card;
406
407 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
408 }
409
410 host->card = card;
411
412 mmc_release_host(host);
413
414 err = mmc_register_card(card);
415 if (err)
416 goto reclaim_host;
417
418 return 0;
419
420reclaim_host:
421 mmc_claim_host(host);
422free_card:
423 mmc_remove_card(card);
424 host->card = NULL;
425err:
426 mmc_detach_bus(host);
427 mmc_release_host(host);
428
429 return 0;
430}
431
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 43bf6a5c398d..efae87b5c4e7 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -131,6 +131,8 @@ struct mmc_host {
131 unsigned int max_blk_count; /* maximum number of blocks in one req */ 131 unsigned int max_blk_count; /* maximum number of blocks in one req */
132 132
133 /* private data */ 133 /* private data */
134 spinlock_t lock; /* lock for claim and bus ops */
135
134 struct mmc_ios ios; /* current io bus settings */ 136 struct mmc_ios ios; /* current io bus settings */
135 u32 ocr; /* the current OCR setting */ 137 u32 ocr; /* the current OCR setting */
136 138
@@ -141,7 +143,6 @@ struct mmc_host {
141 struct mmc_card *card; /* device attached to this host */ 143 struct mmc_card *card; /* device attached to this host */
142 144
143 wait_queue_head_t wq; 145 wait_queue_head_t wq;
144 spinlock_t lock; /* claimed lock */
145 unsigned int claimed:1; /* host exclusively claimed */ 146 unsigned int claimed:1; /* host exclusively claimed */
146 147
147 struct delayed_work detect; 148 struct delayed_work detect;
@@ -149,6 +150,10 @@ struct mmc_host {
149 unsigned int removed:1; /* host is being removed */ 150 unsigned int removed:1; /* host is being removed */
150#endif 151#endif
151 152
153 const struct mmc_bus_ops *bus_ops; /* current bus driver */
154 unsigned int bus_refs; /* reference counter */
155 unsigned int bus_dead:1; /* bus has been released */
156
152 unsigned long private[0] ____cacheline_aligned; 157 unsigned long private[0] ____cacheline_aligned;
153}; 158};
154 159
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-02 12:19:52 -0500