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1/*
2 * linux/drivers/mmc/sdio.c
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/err.h>
13#include <linux/pm_runtime.h>
14
15#include <linux/mmc/host.h>
16#include <linux/mmc/card.h>
17#include <linux/mmc/sdio.h>
18#include <linux/mmc/sdio_func.h>
19#include <linux/mmc/sdio_ids.h>
20
21#include "core.h"
22#include "bus.h"
23#include "sd.h"
24#include "sdio_bus.h"
25#include "mmc_ops.h"
26#include "sd_ops.h"
27#include "sdio_ops.h"
28#include "sdio_cis.h"
29
30static int sdio_read_fbr(struct sdio_func *func)
31{
32 int ret;
33 unsigned char data;
34
35 if (mmc_card_nonstd_func_interface(func->card)) {
36 func->class = SDIO_CLASS_NONE;
37 return 0;
38 }
39
40 ret = mmc_io_rw_direct(func->card, 0, 0,
41 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
42 if (ret)
43 goto out;
44
45 data &= 0x0f;
46
47 if (data == 0x0f) {
48 ret = mmc_io_rw_direct(func->card, 0, 0,
49 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
50 if (ret)
51 goto out;
52 }
53
54 func->class = data;
55
56out:
57 return ret;
58}
59
60static int sdio_init_func(struct mmc_card *card, unsigned int fn)
61{
62 int ret;
63 struct sdio_func *func;
64
65 BUG_ON(fn > SDIO_MAX_FUNCS);
66
67 func = sdio_alloc_func(card);
68 if (IS_ERR(func))
69 return PTR_ERR(func);
70
71 func->num = fn;
72
73 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
74 ret = sdio_read_fbr(func);
75 if (ret)
76 goto fail;
77
78 ret = sdio_read_func_cis(func);
79 if (ret)
80 goto fail;
81 } else {
82 func->vendor = func->card->cis.vendor;
83 func->device = func->card->cis.device;
84 func->max_blksize = func->card->cis.blksize;
85 }
86
87 card->sdio_func[fn - 1] = func;
88
89 return 0;
90
91fail:
92 /*
93 * It is okay to remove the function here even though we hold
94 * the host lock as we haven't registered the device yet.
95 */
96 sdio_remove_func(func);
97 return ret;
98}
99
100static int sdio_read_cccr(struct mmc_card *card)
101{
102 int ret;
103 int cccr_vsn;
104 unsigned char data;
105
106 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
107
108 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
109 if (ret)
110 goto out;
111
112 cccr_vsn = data & 0x0f;
113
114 if (cccr_vsn > SDIO_CCCR_REV_1_20) {
115 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
116 mmc_hostname(card->host), cccr_vsn);
117 return -EINVAL;
118 }
119
120 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
121
122 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
123 if (ret)
124 goto out;
125
126 if (data & SDIO_CCCR_CAP_SMB)
127 card->cccr.multi_block = 1;
128 if (data & SDIO_CCCR_CAP_LSC)
129 card->cccr.low_speed = 1;
130 if (data & SDIO_CCCR_CAP_4BLS)
131 card->cccr.wide_bus = 1;
132
133 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
134 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
135 if (ret)
136 goto out;
137
138 if (data & SDIO_POWER_SMPC)
139 card->cccr.high_power = 1;
140 }
141
142 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
143 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
144 if (ret)
145 goto out;
146
147 if (data & SDIO_SPEED_SHS)
148 card->cccr.high_speed = 1;
149 }
150
151out:
152 return ret;
153}
154
155static int sdio_enable_wide(struct mmc_card *card)
156{
157 int ret;
158 u8 ctrl;
159
160 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
161 return 0;
162
163 if (card->cccr.low_speed && !card->cccr.wide_bus)
164 return 0;
165
166 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
167 if (ret)
168 return ret;
169
170 ctrl |= SDIO_BUS_WIDTH_4BIT;
171
172 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
173 if (ret)
174 return ret;
175
176 return 1;
177}
178
179/*
180 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
181 * of the card. This may be required on certain setups of boards,
182 * controllers and embedded sdio device which do not need the card's
183 * pull-up. As a result, card detection is disabled and power is saved.
184 */
185static int sdio_disable_cd(struct mmc_card *card)
186{
187 int ret;
188 u8 ctrl;
189
190 if (!mmc_card_disable_cd(card))
191 return 0;
192
193 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
194 if (ret)
195 return ret;
196
197 ctrl |= SDIO_BUS_CD_DISABLE;
198
199 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
200}
201
202/*
203 * Devices that remain active during a system suspend are
204 * put back into 1-bit mode.
205 */
206static int sdio_disable_wide(struct mmc_card *card)
207{
208 int ret;
209 u8 ctrl;
210
211 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
212 return 0;
213
214 if (card->cccr.low_speed && !card->cccr.wide_bus)
215 return 0;
216
217 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
218 if (ret)
219 return ret;
220
221 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
222 return 0;
223
224 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
225 ctrl |= SDIO_BUS_ASYNC_INT;
226
227 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
228 if (ret)
229 return ret;
230
231 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
232
233 return 0;
234}
235
236
237static int sdio_enable_4bit_bus(struct mmc_card *card)
238{
239 int err;
240
241 if (card->type == MMC_TYPE_SDIO)
242 return sdio_enable_wide(card);
243
244 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
245 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
246 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
247 if (err)
248 return err;
249 } else
250 return 0;
251
252 err = sdio_enable_wide(card);
253 if (err <= 0)
254 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
255
256 return err;
257}
258
259
260/*
261 * Test if the card supports high-speed mode and, if so, switch to it.
262 */
263static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
264{
265 int ret;
266 u8 speed;
267
268 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
269 return 0;
270
271 if (!card->cccr.high_speed)
272 return 0;
273
274 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
275 if (ret)
276 return ret;
277
278 if (enable)
279 speed |= SDIO_SPEED_EHS;
280 else
281 speed &= ~SDIO_SPEED_EHS;
282
283 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
284 if (ret)
285 return ret;
286
287 return 1;
288}
289
290/*
291 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
292 */
293static int sdio_enable_hs(struct mmc_card *card)
294{
295 int ret;
296
297 ret = mmc_sdio_switch_hs(card, true);
298 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
299 return ret;
300
301 ret = mmc_sd_switch_hs(card);
302 if (ret <= 0)
303 mmc_sdio_switch_hs(card, false);
304
305 return ret;
306}
307
308static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
309{
310 unsigned max_dtr;
311
312 if (mmc_card_highspeed(card)) {
313 /*
314 * The SDIO specification doesn't mention how
315 * the CIS transfer speed register relates to
316 * high-speed, but it seems that 50 MHz is
317 * mandatory.
318 */
319 max_dtr = 50000000;
320 } else {
321 max_dtr = card->cis.max_dtr;
322 }
323
324 if (card->type == MMC_TYPE_SD_COMBO)
325 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
326
327 return max_dtr;
328}
329
330/*
331 * Handle the detection and initialisation of a card.
332 *
333 * In the case of a resume, "oldcard" will contain the card
334 * we're trying to reinitialise.
335 */
336static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
337 struct mmc_card *oldcard, int powered_resume)
338{
339 struct mmc_card *card;
340 int err;
341
342 BUG_ON(!host);
343 WARN_ON(!host->claimed);
344
345 /*
346 * Inform the card of the voltage
347 */
348 if (!powered_resume) {
349 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
350 if (err)
351 goto err;
352 }
353
354 /*
355 * For SPI, enable CRC as appropriate.
356 */
357 if (mmc_host_is_spi(host)) {
358 err = mmc_spi_set_crc(host, use_spi_crc);
359 if (err)
360 goto err;
361 }
362
363 /*
364 * Allocate card structure.
365 */
366 card = mmc_alloc_card(host, NULL);
367 if (IS_ERR(card)) {
368 err = PTR_ERR(card);
369 goto err;
370 }
371
372 if ((ocr & R4_MEMORY_PRESENT) &&
373 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
374 card->type = MMC_TYPE_SD_COMBO;
375
376 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
377 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
378 mmc_remove_card(card);
379 return -ENOENT;
380 }
381 } else {
382 card->type = MMC_TYPE_SDIO;
383
384 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
385 mmc_remove_card(card);
386 return -ENOENT;
387 }
388 }
389
390 /*
391 * Call the optional HC's init_card function to handle quirks.
392 */
393 if (host->ops->init_card)
394 host->ops->init_card(host, card);
395
396 /*
397 * For native busses: set card RCA and quit open drain mode.
398 */
399 if (!powered_resume && !mmc_host_is_spi(host)) {
400 err = mmc_send_relative_addr(host, &card->rca);
401 if (err)
402 goto remove;
403
404 /*
405 * Update oldcard with the new RCA received from the SDIO
406 * device -- we're doing this so that it's updated in the
407 * "card" struct when oldcard overwrites that later.
408 */
409 if (oldcard)
410 oldcard->rca = card->rca;
411
412 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
413 }
414
415 /*
416 * Read CSD, before selecting the card
417 */
418 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
419 err = mmc_sd_get_csd(host, card);
420 if (err)
421 return err;
422
423 mmc_decode_cid(card);
424 }
425
426 /*
427 * Select card, as all following commands rely on that.
428 */
429 if (!powered_resume && !mmc_host_is_spi(host)) {
430 err = mmc_select_card(card);
431 if (err)
432 goto remove;
433 }
434
435 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
436 /*
437 * This is non-standard SDIO device, meaning it doesn't
438 * have any CIA (Common I/O area) registers present.
439 * It's host's responsibility to fill cccr and cis
440 * structures in init_card().
441 */
442 mmc_set_clock(host, card->cis.max_dtr);
443
444 if (card->cccr.high_speed) {
445 mmc_card_set_highspeed(card);
446 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
447 }
448
449 goto finish;
450 }
451
452 /*
453 * Read the common registers.
454 */
455 err = sdio_read_cccr(card);
456 if (err)
457 goto remove;
458
459 /*
460 * Read the common CIS tuples.
461 */
462 err = sdio_read_common_cis(card);
463 if (err)
464 goto remove;
465
466 if (oldcard) {
467 int same = (card->cis.vendor == oldcard->cis.vendor &&
468 card->cis.device == oldcard->cis.device);
469 mmc_remove_card(card);
470 if (!same)
471 return -ENOENT;
472
473 card = oldcard;
474 }
475 mmc_fixup_device(card, NULL);
476
477 if (card->type == MMC_TYPE_SD_COMBO) {
478 err = mmc_sd_setup_card(host, card, oldcard != NULL);
479 /* handle as SDIO-only card if memory init failed */
480 if (err) {
481 mmc_go_idle(host);
482 if (mmc_host_is_spi(host))
483 /* should not fail, as it worked previously */
484 mmc_spi_set_crc(host, use_spi_crc);
485 card->type = MMC_TYPE_SDIO;
486 } else
487 card->dev.type = &sd_type;
488 }
489
490 /*
491 * If needed, disconnect card detection pull-up resistor.
492 */
493 err = sdio_disable_cd(card);
494 if (err)
495 goto remove;
496
497 /*
498 * Switch to high-speed (if supported).
499 */
500 err = sdio_enable_hs(card);
501 if (err > 0)
502 mmc_sd_go_highspeed(card);
503 else if (err)
504 goto remove;
505
506 /*
507 * Change to the card's maximum speed.
508 */
509 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
510
511 /*
512 * Switch to wider bus (if supported).
513 */
514 err = sdio_enable_4bit_bus(card);
515 if (err > 0)
516 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
517 else if (err)
518 goto remove;
519
520finish:
521 if (!oldcard)
522 host->card = card;
523 return 0;
524
525remove:
526 if (!oldcard)
527 mmc_remove_card(card);
528
529err:
530 return err;
531}
532
533/*
534 * Host is being removed. Free up the current card.
535 */
536static void mmc_sdio_remove(struct mmc_host *host)
537{
538 int i;
539
540 BUG_ON(!host);
541 BUG_ON(!host->card);
542
543 for (i = 0;i < host->card->sdio_funcs;i++) {
544 if (host->card->sdio_func[i]) {
545 sdio_remove_func(host->card->sdio_func[i]);
546 host->card->sdio_func[i] = NULL;
547 }
548 }
549
550 mmc_remove_card(host->card);
551 host->card = NULL;
552}
553
554/*
555 * Card detection callback from host.
556 */
557static void mmc_sdio_detect(struct mmc_host *host)
558{
559 int err;
560
561 BUG_ON(!host);
562 BUG_ON(!host->card);
563
564 /* Make sure card is powered before detecting it */
565 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
566 err = pm_runtime_get_sync(&host->card->dev);
567 if (err < 0)
568 goto out;
569 }
570
571 mmc_claim_host(host);
572
573 /*
574 * Just check if our card has been removed.
575 */
576 err = mmc_select_card(host->card);
577
578 mmc_release_host(host);
579
580 /*
581 * Tell PM core it's OK to power off the card now.
582 *
583 * The _sync variant is used in order to ensure that the card
584 * is left powered off in case an error occurred, and the card
585 * is going to be removed.
586 *
587 * Since there is no specific reason to believe a new user
588 * is about to show up at this point, the _sync variant is
589 * desirable anyway.
590 */
591 if (host->caps & MMC_CAP_POWER_OFF_CARD)
592 pm_runtime_put_sync(&host->card->dev);
593
594out:
595 if (err) {
596 mmc_sdio_remove(host);
597
598 mmc_claim_host(host);
599 mmc_detach_bus(host);
600 mmc_release_host(host);
601 }
602}
603
604/*
605 * SDIO suspend. We need to suspend all functions separately.
606 * Therefore all registered functions must have drivers with suspend
607 * and resume methods. Failing that we simply remove the whole card.
608 */
609static int mmc_sdio_suspend(struct mmc_host *host)
610{
611 int i, err = 0;
612
613 for (i = 0; i < host->card->sdio_funcs; i++) {
614 struct sdio_func *func = host->card->sdio_func[i];
615 if (func && sdio_func_present(func) && func->dev.driver) {
616 const struct dev_pm_ops *pmops = func->dev.driver->pm;
617 if (!pmops || !pmops->suspend || !pmops->resume) {
618 /* force removal of entire card in that case */
619 err = -ENOSYS;
620 } else
621 err = pmops->suspend(&func->dev);
622 if (err)
623 break;
624 }
625 }
626 while (err && --i >= 0) {
627 struct sdio_func *func = host->card->sdio_func[i];
628 if (func && sdio_func_present(func) && func->dev.driver) {
629 const struct dev_pm_ops *pmops = func->dev.driver->pm;
630 pmops->resume(&func->dev);
631 }
632 }
633
634 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
635 mmc_claim_host(host);
636 sdio_disable_wide(host->card);
637 mmc_release_host(host);
638 }
639
640 return err;
641}
642
643static int mmc_sdio_resume(struct mmc_host *host)
644{
645 int i, err = 0;
646
647 BUG_ON(!host);
648 BUG_ON(!host->card);
649
650 /* Basic card reinitialization. */
651 mmc_claim_host(host);
652
653 /* No need to reinitialize powered-resumed nonremovable cards */
654 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
655 err = mmc_sdio_init_card(host, host->ocr, host->card,
656 mmc_card_keep_power(host));
657 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
658 /* We may have switched to 1-bit mode during suspend */
659 err = sdio_enable_4bit_bus(host->card);
660 if (err > 0) {
661 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
662 err = 0;
663 }
664 }
665
666 if (!err && host->sdio_irqs)
667 mmc_signal_sdio_irq(host);
668 mmc_release_host(host);
669
670 /*
671 * If the card looked to be the same as before suspending, then
672 * we proceed to resume all card functions. If one of them returns
673 * an error then we simply return that error to the core and the
674 * card will be redetected as new. It is the responsibility of
675 * the function driver to perform further tests with the extra
676 * knowledge it has of the card to confirm the card is indeed the
677 * same as before suspending (same MAC address for network cards,
678 * etc.) and return an error otherwise.
679 */
680 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
681 struct sdio_func *func = host->card->sdio_func[i];
682 if (func && sdio_func_present(func) && func->dev.driver) {
683 const struct dev_pm_ops *pmops = func->dev.driver->pm;
684 err = pmops->resume(&func->dev);
685 }
686 }
687
688 return err;
689}
690
691static int mmc_sdio_power_restore(struct mmc_host *host)
692{
693 int ret;
694 u32 ocr;
695
696 BUG_ON(!host);
697 BUG_ON(!host->card);
698
699 mmc_claim_host(host);
700
701 /*
702 * Reset the card by performing the same steps that are taken by
703 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
704 *
705 * sdio_reset() is technically not needed. Having just powered up the
706 * hardware, it should already be in reset state. However, some
707 * platforms (such as SD8686 on OLPC) do not instantly cut power,
708 * meaning that a reset is required when restoring power soon after
709 * powering off. It is harmless in other cases.
710 *
711 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
712 * is not necessary for non-removable cards. However, it is required
713 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
714 * harmless in other situations.
715 *
716 * With these steps taken, mmc_select_voltage() is also required to
717 * restore the correct voltage setting of the card.
718 */
719 sdio_reset(host);
720 mmc_go_idle(host);
721 mmc_send_if_cond(host, host->ocr_avail);
722
723 ret = mmc_send_io_op_cond(host, 0, &ocr);
724 if (ret)
725 goto out;
726
727 if (host->ocr_avail_sdio)
728 host->ocr_avail = host->ocr_avail_sdio;
729
730 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
731 if (!host->ocr) {
732 ret = -EINVAL;
733 goto out;
734 }
735
736 ret = mmc_sdio_init_card(host, host->ocr, host->card,
737 mmc_card_keep_power(host));
738 if (!ret && host->sdio_irqs)
739 mmc_signal_sdio_irq(host);
740
741out:
742 mmc_release_host(host);
743
744 return ret;
745}
746
747static const struct mmc_bus_ops mmc_sdio_ops = {
748 .remove = mmc_sdio_remove,
749 .detect = mmc_sdio_detect,
750 .suspend = mmc_sdio_suspend,
751 .resume = mmc_sdio_resume,
752 .power_restore = mmc_sdio_power_restore,
753};
754
755
756/*
757 * Starting point for SDIO card init.
758 */
759int mmc_attach_sdio(struct mmc_host *host)
760{
761 int err, i, funcs;
762 u32 ocr;
763 struct mmc_card *card;
764
765 BUG_ON(!host);
766 WARN_ON(!host->claimed);
767
768 err = mmc_send_io_op_cond(host, 0, &ocr);
769 if (err)
770 return err;
771
772 mmc_attach_bus(host, &mmc_sdio_ops);
773 if (host->ocr_avail_sdio)
774 host->ocr_avail = host->ocr_avail_sdio;
775
776 /*
777 * Sanity check the voltages that the card claims to
778 * support.
779 */
780 if (ocr & 0x7F) {
781 printk(KERN_WARNING "%s: card claims to support voltages "
782 "below the defined range. These will be ignored.\n",
783 mmc_hostname(host));
784 ocr &= ~0x7F;
785 }
786
787 host->ocr = mmc_select_voltage(host, ocr);
788
789 /*
790 * Can we support the voltage(s) of the card(s)?
791 */
792 if (!host->ocr) {
793 err = -EINVAL;
794 goto err;
795 }
796
797 /*
798 * Detect and init the card.
799 */
800 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
801 if (err)
802 goto err;
803 card = host->card;
804
805 /*
806 * Enable runtime PM only if supported by host+card+board
807 */
808 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
809 /*
810 * Let runtime PM core know our card is active
811 */
812 err = pm_runtime_set_active(&card->dev);
813 if (err)
814 goto remove;
815
816 /*
817 * Enable runtime PM for this card
818 */
819 pm_runtime_enable(&card->dev);
820 }
821
822 /*
823 * The number of functions on the card is encoded inside
824 * the ocr.
825 */
826 funcs = (ocr & 0x70000000) >> 28;
827 card->sdio_funcs = 0;
828
829 /*
830 * Initialize (but don't add) all present functions.
831 */
832 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
833 err = sdio_init_func(host->card, i + 1);
834 if (err)
835 goto remove;
836
837 /*
838 * Enable Runtime PM for this func (if supported)
839 */
840 if (host->caps & MMC_CAP_POWER_OFF_CARD)
841 pm_runtime_enable(&card->sdio_func[i]->dev);
842 }
843
844 /*
845 * First add the card to the driver model...
846 */
847 mmc_release_host(host);
848 err = mmc_add_card(host->card);
849 if (err)
850 goto remove_added;
851
852 /*
853 * ...then the SDIO functions.
854 */
855 for (i = 0;i < funcs;i++) {
856 err = sdio_add_func(host->card->sdio_func[i]);
857 if (err)
858 goto remove_added;
859 }
860
861 mmc_claim_host(host);
862 return 0;
863
864
865remove_added:
866 /* Remove without lock if the device has been added. */
867 mmc_sdio_remove(host);
868 mmc_claim_host(host);
869remove:
870 /* And with lock if it hasn't been added. */
871 mmc_release_host(host);
872 if (host->card)
873 mmc_sdio_remove(host);
874 mmc_claim_host(host);
875err:
876 mmc_detach_bus(host);
877
878 printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
879 mmc_hostname(host), err);
880
881 return err;
882}
883
1/*
2 * linux/drivers/mmc/sdio.c
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/err.h>
13#include <linux/pm_runtime.h>
14
15#include <linux/mmc/host.h>
16#include <linux/mmc/card.h>
17#include <linux/mmc/mmc.h>
18#include <linux/mmc/sdio.h>
19#include <linux/mmc/sdio_func.h>
20#include <linux/mmc/sdio_ids.h>
21
22#include "core.h"
23#include "bus.h"
24#include "sd.h"
25#include "sdio_bus.h"
26#include "mmc_ops.h"
27#include "sd_ops.h"
28#include "sdio_ops.h"
29#include "sdio_cis.h"
30
31static int sdio_read_fbr(struct sdio_func *func)
32{
33 int ret;
34 unsigned char data;
35
36 if (mmc_card_nonstd_func_interface(func->card)) {
37 func->class = SDIO_CLASS_NONE;
38 return 0;
39 }
40
41 ret = mmc_io_rw_direct(func->card, 0, 0,
42 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
43 if (ret)
44 goto out;
45
46 data &= 0x0f;
47
48 if (data == 0x0f) {
49 ret = mmc_io_rw_direct(func->card, 0, 0,
50 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
51 if (ret)
52 goto out;
53 }
54
55 func->class = data;
56
57out:
58 return ret;
59}
60
61static int sdio_init_func(struct mmc_card *card, unsigned int fn)
62{
63 int ret;
64 struct sdio_func *func;
65
66 if (WARN_ON(fn > SDIO_MAX_FUNCS))
67 return -EINVAL;
68
69 func = sdio_alloc_func(card);
70 if (IS_ERR(func))
71 return PTR_ERR(func);
72
73 func->num = fn;
74
75 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
76 ret = sdio_read_fbr(func);
77 if (ret)
78 goto fail;
79
80 ret = sdio_read_func_cis(func);
81 if (ret)
82 goto fail;
83 } else {
84 func->vendor = func->card->cis.vendor;
85 func->device = func->card->cis.device;
86 func->max_blksize = func->card->cis.blksize;
87 }
88
89 card->sdio_func[fn - 1] = func;
90
91 return 0;
92
93fail:
94 /*
95 * It is okay to remove the function here even though we hold
96 * the host lock as we haven't registered the device yet.
97 */
98 sdio_remove_func(func);
99 return ret;
100}
101
102static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
103{
104 int ret;
105 int cccr_vsn;
106 int uhs = ocr & R4_18V_PRESENT;
107 unsigned char data;
108 unsigned char speed;
109
110 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
111 if (ret)
112 goto out;
113
114 cccr_vsn = data & 0x0f;
115
116 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
117 pr_err("%s: unrecognised CCCR structure version %d\n",
118 mmc_hostname(card->host), cccr_vsn);
119 return -EINVAL;
120 }
121
122 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
123
124 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
125 if (ret)
126 goto out;
127
128 if (data & SDIO_CCCR_CAP_SMB)
129 card->cccr.multi_block = 1;
130 if (data & SDIO_CCCR_CAP_LSC)
131 card->cccr.low_speed = 1;
132 if (data & SDIO_CCCR_CAP_4BLS)
133 card->cccr.wide_bus = 1;
134
135 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
136 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
137 if (ret)
138 goto out;
139
140 if (data & SDIO_POWER_SMPC)
141 card->cccr.high_power = 1;
142 }
143
144 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
145 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
146 if (ret)
147 goto out;
148
149 card->scr.sda_spec3 = 0;
150 card->sw_caps.sd3_bus_mode = 0;
151 card->sw_caps.sd3_drv_type = 0;
152 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
153 card->scr.sda_spec3 = 1;
154 ret = mmc_io_rw_direct(card, 0, 0,
155 SDIO_CCCR_UHS, 0, &data);
156 if (ret)
157 goto out;
158
159 if (mmc_host_uhs(card->host)) {
160 if (data & SDIO_UHS_DDR50)
161 card->sw_caps.sd3_bus_mode
162 |= SD_MODE_UHS_DDR50;
163
164 if (data & SDIO_UHS_SDR50)
165 card->sw_caps.sd3_bus_mode
166 |= SD_MODE_UHS_SDR50;
167
168 if (data & SDIO_UHS_SDR104)
169 card->sw_caps.sd3_bus_mode
170 |= SD_MODE_UHS_SDR104;
171 }
172
173 ret = mmc_io_rw_direct(card, 0, 0,
174 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
175 if (ret)
176 goto out;
177
178 if (data & SDIO_DRIVE_SDTA)
179 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
180 if (data & SDIO_DRIVE_SDTC)
181 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
182 if (data & SDIO_DRIVE_SDTD)
183 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
184 }
185
186 /* if no uhs mode ensure we check for high speed */
187 if (!card->sw_caps.sd3_bus_mode) {
188 if (speed & SDIO_SPEED_SHS) {
189 card->cccr.high_speed = 1;
190 card->sw_caps.hs_max_dtr = 50000000;
191 } else {
192 card->cccr.high_speed = 0;
193 card->sw_caps.hs_max_dtr = 25000000;
194 }
195 }
196 }
197
198out:
199 return ret;
200}
201
202static int sdio_enable_wide(struct mmc_card *card)
203{
204 int ret;
205 u8 ctrl;
206
207 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
208 return 0;
209
210 if (card->cccr.low_speed && !card->cccr.wide_bus)
211 return 0;
212
213 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
214 if (ret)
215 return ret;
216
217 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
218 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
219 mmc_hostname(card->host), ctrl);
220
221 /* set as 4-bit bus width */
222 ctrl &= ~SDIO_BUS_WIDTH_MASK;
223 ctrl |= SDIO_BUS_WIDTH_4BIT;
224
225 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
226 if (ret)
227 return ret;
228
229 return 1;
230}
231
232/*
233 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
234 * of the card. This may be required on certain setups of boards,
235 * controllers and embedded sdio device which do not need the card's
236 * pull-up. As a result, card detection is disabled and power is saved.
237 */
238static int sdio_disable_cd(struct mmc_card *card)
239{
240 int ret;
241 u8 ctrl;
242
243 if (!mmc_card_disable_cd(card))
244 return 0;
245
246 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
247 if (ret)
248 return ret;
249
250 ctrl |= SDIO_BUS_CD_DISABLE;
251
252 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
253}
254
255/*
256 * Devices that remain active during a system suspend are
257 * put back into 1-bit mode.
258 */
259static int sdio_disable_wide(struct mmc_card *card)
260{
261 int ret;
262 u8 ctrl;
263
264 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
265 return 0;
266
267 if (card->cccr.low_speed && !card->cccr.wide_bus)
268 return 0;
269
270 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
271 if (ret)
272 return ret;
273
274 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
275 return 0;
276
277 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
278 ctrl |= SDIO_BUS_ASYNC_INT;
279
280 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
281 if (ret)
282 return ret;
283
284 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
285
286 return 0;
287}
288
289
290static int sdio_enable_4bit_bus(struct mmc_card *card)
291{
292 int err;
293
294 if (card->type == MMC_TYPE_SDIO)
295 err = sdio_enable_wide(card);
296 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
297 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
298 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
299 if (err)
300 return err;
301 err = sdio_enable_wide(card);
302 if (err <= 0)
303 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
304 } else
305 return 0;
306
307 if (err > 0) {
308 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
309 err = 0;
310 }
311
312 return err;
313}
314
315
316/*
317 * Test if the card supports high-speed mode and, if so, switch to it.
318 */
319static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
320{
321 int ret;
322 u8 speed;
323
324 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
325 return 0;
326
327 if (!card->cccr.high_speed)
328 return 0;
329
330 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
331 if (ret)
332 return ret;
333
334 if (enable)
335 speed |= SDIO_SPEED_EHS;
336 else
337 speed &= ~SDIO_SPEED_EHS;
338
339 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
340 if (ret)
341 return ret;
342
343 return 1;
344}
345
346/*
347 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
348 */
349static int sdio_enable_hs(struct mmc_card *card)
350{
351 int ret;
352
353 ret = mmc_sdio_switch_hs(card, true);
354 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
355 return ret;
356
357 ret = mmc_sd_switch_hs(card);
358 if (ret <= 0)
359 mmc_sdio_switch_hs(card, false);
360
361 return ret;
362}
363
364static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
365{
366 unsigned max_dtr;
367
368 if (mmc_card_hs(card)) {
369 /*
370 * The SDIO specification doesn't mention how
371 * the CIS transfer speed register relates to
372 * high-speed, but it seems that 50 MHz is
373 * mandatory.
374 */
375 max_dtr = 50000000;
376 } else {
377 max_dtr = card->cis.max_dtr;
378 }
379
380 if (card->type == MMC_TYPE_SD_COMBO)
381 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
382
383 return max_dtr;
384}
385
386static unsigned char host_drive_to_sdio_drive(int host_strength)
387{
388 switch (host_strength) {
389 case MMC_SET_DRIVER_TYPE_A:
390 return SDIO_DTSx_SET_TYPE_A;
391 case MMC_SET_DRIVER_TYPE_B:
392 return SDIO_DTSx_SET_TYPE_B;
393 case MMC_SET_DRIVER_TYPE_C:
394 return SDIO_DTSx_SET_TYPE_C;
395 case MMC_SET_DRIVER_TYPE_D:
396 return SDIO_DTSx_SET_TYPE_D;
397 default:
398 return SDIO_DTSx_SET_TYPE_B;
399 }
400}
401
402static void sdio_select_driver_type(struct mmc_card *card)
403{
404 int card_drv_type, drive_strength, drv_type;
405 unsigned char card_strength;
406 int err;
407
408 card->drive_strength = 0;
409
410 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
411
412 drive_strength = mmc_select_drive_strength(card,
413 card->sw_caps.uhs_max_dtr,
414 card_drv_type, &drv_type);
415
416 if (drive_strength) {
417 /* if error just use default for drive strength B */
418 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
419 &card_strength);
420 if (err)
421 return;
422
423 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
424 card_strength |= host_drive_to_sdio_drive(drive_strength);
425
426 /* if error default to drive strength B */
427 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
428 card_strength, NULL);
429 if (err)
430 return;
431 card->drive_strength = drive_strength;
432 }
433
434 if (drv_type)
435 mmc_set_driver_type(card->host, drv_type);
436}
437
438
439static int sdio_set_bus_speed_mode(struct mmc_card *card)
440{
441 unsigned int bus_speed, timing;
442 int err;
443 unsigned char speed;
444
445 /*
446 * If the host doesn't support any of the UHS-I modes, fallback on
447 * default speed.
448 */
449 if (!mmc_host_uhs(card->host))
450 return 0;
451
452 bus_speed = SDIO_SPEED_SDR12;
453 timing = MMC_TIMING_UHS_SDR12;
454 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
455 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
456 bus_speed = SDIO_SPEED_SDR104;
457 timing = MMC_TIMING_UHS_SDR104;
458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
459 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
460 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
461 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
462 bus_speed = SDIO_SPEED_DDR50;
463 timing = MMC_TIMING_UHS_DDR50;
464 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
465 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
467 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
468 SD_MODE_UHS_SDR50)) {
469 bus_speed = SDIO_SPEED_SDR50;
470 timing = MMC_TIMING_UHS_SDR50;
471 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
476 bus_speed = SDIO_SPEED_SDR25;
477 timing = MMC_TIMING_UHS_SDR25;
478 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
479 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
480 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
481 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
483 SD_MODE_UHS_SDR12)) {
484 bus_speed = SDIO_SPEED_SDR12;
485 timing = MMC_TIMING_UHS_SDR12;
486 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
487 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
488 }
489
490 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
491 if (err)
492 return err;
493
494 speed &= ~SDIO_SPEED_BSS_MASK;
495 speed |= bus_speed;
496 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
497 if (err)
498 return err;
499
500 if (bus_speed) {
501 mmc_set_timing(card->host, timing);
502 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
503 }
504
505 return 0;
506}
507
508/*
509 * UHS-I specific initialization procedure
510 */
511static int mmc_sdio_init_uhs_card(struct mmc_card *card)
512{
513 int err;
514
515 if (!card->scr.sda_spec3)
516 return 0;
517
518 /*
519 * Switch to wider bus (if supported).
520 */
521 if (card->host->caps & MMC_CAP_4_BIT_DATA)
522 err = sdio_enable_4bit_bus(card);
523
524 /* Set the driver strength for the card */
525 sdio_select_driver_type(card);
526
527 /* Set bus speed mode of the card */
528 err = sdio_set_bus_speed_mode(card);
529 if (err)
530 goto out;
531
532 /*
533 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
534 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
535 */
536 if (!mmc_host_is_spi(card->host) &&
537 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
538 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
539 err = mmc_execute_tuning(card);
540out:
541 return err;
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 */
550static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
551 struct mmc_card *oldcard, int powered_resume)
552{
553 struct mmc_card *card;
554 int err;
555 int retries = 10;
556 u32 rocr = 0;
557 u32 ocr_card = ocr;
558
559 WARN_ON(!host->claimed);
560
561 /* to query card if 1.8V signalling is supported */
562 if (mmc_host_uhs(host))
563 ocr |= R4_18V_PRESENT;
564
565try_again:
566 if (!retries) {
567 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
568 ocr &= ~R4_18V_PRESENT;
569 }
570
571 /*
572 * Inform the card of the voltage
573 */
574 if (!powered_resume) {
575 err = mmc_send_io_op_cond(host, ocr, &rocr);
576 if (err)
577 goto err;
578 }
579
580 /*
581 * For SPI, enable CRC as appropriate.
582 */
583 if (mmc_host_is_spi(host)) {
584 err = mmc_spi_set_crc(host, use_spi_crc);
585 if (err)
586 goto err;
587 }
588
589 /*
590 * Allocate card structure.
591 */
592 card = mmc_alloc_card(host, NULL);
593 if (IS_ERR(card)) {
594 err = PTR_ERR(card);
595 goto err;
596 }
597
598 if ((rocr & R4_MEMORY_PRESENT) &&
599 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
600 card->type = MMC_TYPE_SD_COMBO;
601
602 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
603 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
604 mmc_remove_card(card);
605 return -ENOENT;
606 }
607 } else {
608 card->type = MMC_TYPE_SDIO;
609
610 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
611 mmc_remove_card(card);
612 return -ENOENT;
613 }
614 }
615
616 /*
617 * Call the optional HC's init_card function to handle quirks.
618 */
619 if (host->ops->init_card)
620 host->ops->init_card(host, card);
621
622 /*
623 * If the host and card support UHS-I mode request the card
624 * to switch to 1.8V signaling level. No 1.8v signalling if
625 * UHS mode is not enabled to maintain compatibility and some
626 * systems that claim 1.8v signalling in fact do not support
627 * it.
628 */
629 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
630 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
631 ocr_card);
632 if (err == -EAGAIN) {
633 sdio_reset(host);
634 mmc_go_idle(host);
635 mmc_send_if_cond(host, host->ocr_avail);
636 mmc_remove_card(card);
637 retries--;
638 goto try_again;
639 } else if (err) {
640 ocr &= ~R4_18V_PRESENT;
641 }
642 err = 0;
643 } else {
644 ocr &= ~R4_18V_PRESENT;
645 }
646
647 /*
648 * For native busses: set card RCA and quit open drain mode.
649 */
650 if (!powered_resume && !mmc_host_is_spi(host)) {
651 err = mmc_send_relative_addr(host, &card->rca);
652 if (err)
653 goto remove;
654
655 /*
656 * Update oldcard with the new RCA received from the SDIO
657 * device -- we're doing this so that it's updated in the
658 * "card" struct when oldcard overwrites that later.
659 */
660 if (oldcard)
661 oldcard->rca = card->rca;
662 }
663
664 /*
665 * Read CSD, before selecting the card
666 */
667 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
668 err = mmc_sd_get_csd(host, card);
669 if (err)
670 return err;
671
672 mmc_decode_cid(card);
673 }
674
675 /*
676 * Select card, as all following commands rely on that.
677 */
678 if (!powered_resume && !mmc_host_is_spi(host)) {
679 err = mmc_select_card(card);
680 if (err)
681 goto remove;
682 }
683
684 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
685 /*
686 * This is non-standard SDIO device, meaning it doesn't
687 * have any CIA (Common I/O area) registers present.
688 * It's host's responsibility to fill cccr and cis
689 * structures in init_card().
690 */
691 mmc_set_clock(host, card->cis.max_dtr);
692
693 if (card->cccr.high_speed) {
694 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
695 }
696
697 goto finish;
698 }
699
700 /*
701 * Read the common registers.
702 */
703 err = sdio_read_cccr(card, ocr);
704 if (err)
705 goto remove;
706
707 /*
708 * Read the common CIS tuples.
709 */
710 err = sdio_read_common_cis(card);
711 if (err)
712 goto remove;
713
714 if (oldcard) {
715 int same = (card->cis.vendor == oldcard->cis.vendor &&
716 card->cis.device == oldcard->cis.device);
717 mmc_remove_card(card);
718 if (!same)
719 return -ENOENT;
720
721 card = oldcard;
722 }
723 card->ocr = ocr_card;
724 mmc_fixup_device(card, NULL);
725
726 if (card->type == MMC_TYPE_SD_COMBO) {
727 err = mmc_sd_setup_card(host, card, oldcard != NULL);
728 /* handle as SDIO-only card if memory init failed */
729 if (err) {
730 mmc_go_idle(host);
731 if (mmc_host_is_spi(host))
732 /* should not fail, as it worked previously */
733 mmc_spi_set_crc(host, use_spi_crc);
734 card->type = MMC_TYPE_SDIO;
735 } else
736 card->dev.type = &sd_type;
737 }
738
739 /*
740 * If needed, disconnect card detection pull-up resistor.
741 */
742 err = sdio_disable_cd(card);
743 if (err)
744 goto remove;
745
746 /* Initialization sequence for UHS-I cards */
747 /* Only if card supports 1.8v and UHS signaling */
748 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
749 err = mmc_sdio_init_uhs_card(card);
750 if (err)
751 goto remove;
752 } else {
753 /*
754 * Switch to high-speed (if supported).
755 */
756 err = sdio_enable_hs(card);
757 if (err > 0)
758 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
759 else if (err)
760 goto remove;
761
762 /*
763 * Change to the card's maximum speed.
764 */
765 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
766
767 /*
768 * Switch to wider bus (if supported).
769 */
770 err = sdio_enable_4bit_bus(card);
771 if (err)
772 goto remove;
773 }
774finish:
775 if (!oldcard)
776 host->card = card;
777 return 0;
778
779remove:
780 if (!oldcard)
781 mmc_remove_card(card);
782
783err:
784 return err;
785}
786
787/*
788 * Host is being removed. Free up the current card.
789 */
790static void mmc_sdio_remove(struct mmc_host *host)
791{
792 int i;
793
794 for (i = 0;i < host->card->sdio_funcs;i++) {
795 if (host->card->sdio_func[i]) {
796 sdio_remove_func(host->card->sdio_func[i]);
797 host->card->sdio_func[i] = NULL;
798 }
799 }
800
801 mmc_remove_card(host->card);
802 host->card = NULL;
803}
804
805/*
806 * Card detection - card is alive.
807 */
808static int mmc_sdio_alive(struct mmc_host *host)
809{
810 return mmc_select_card(host->card);
811}
812
813/*
814 * Card detection callback from host.
815 */
816static void mmc_sdio_detect(struct mmc_host *host)
817{
818 int err;
819
820 /* Make sure card is powered before detecting it */
821 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
822 err = pm_runtime_get_sync(&host->card->dev);
823 if (err < 0) {
824 pm_runtime_put_noidle(&host->card->dev);
825 goto out;
826 }
827 }
828
829 mmc_claim_host(host);
830
831 /*
832 * Just check if our card has been removed.
833 */
834 err = _mmc_detect_card_removed(host);
835
836 mmc_release_host(host);
837
838 /*
839 * Tell PM core it's OK to power off the card now.
840 *
841 * The _sync variant is used in order to ensure that the card
842 * is left powered off in case an error occurred, and the card
843 * is going to be removed.
844 *
845 * Since there is no specific reason to believe a new user
846 * is about to show up at this point, the _sync variant is
847 * desirable anyway.
848 */
849 if (host->caps & MMC_CAP_POWER_OFF_CARD)
850 pm_runtime_put_sync(&host->card->dev);
851
852out:
853 if (err) {
854 mmc_sdio_remove(host);
855
856 mmc_claim_host(host);
857 mmc_detach_bus(host);
858 mmc_power_off(host);
859 mmc_release_host(host);
860 }
861}
862
863/*
864 * SDIO pre_suspend. We need to suspend all functions separately.
865 * Therefore all registered functions must have drivers with suspend
866 * and resume methods. Failing that we simply remove the whole card.
867 */
868static int mmc_sdio_pre_suspend(struct mmc_host *host)
869{
870 int i, err = 0;
871
872 for (i = 0; i < host->card->sdio_funcs; i++) {
873 struct sdio_func *func = host->card->sdio_func[i];
874 if (func && sdio_func_present(func) && func->dev.driver) {
875 const struct dev_pm_ops *pmops = func->dev.driver->pm;
876 if (!pmops || !pmops->suspend || !pmops->resume) {
877 /* force removal of entire card in that case */
878 err = -ENOSYS;
879 break;
880 }
881 }
882 }
883
884 return err;
885}
886
887/*
888 * SDIO suspend. Suspend all functions separately.
889 */
890static int mmc_sdio_suspend(struct mmc_host *host)
891{
892 mmc_claim_host(host);
893
894 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
895 sdio_disable_wide(host->card);
896
897 if (!mmc_card_keep_power(host)) {
898 mmc_power_off(host);
899 } else if (host->retune_period) {
900 mmc_retune_timer_stop(host);
901 mmc_retune_needed(host);
902 }
903
904 mmc_release_host(host);
905
906 return 0;
907}
908
909static int mmc_sdio_resume(struct mmc_host *host)
910{
911 int err = 0;
912
913 /* Basic card reinitialization. */
914 mmc_claim_host(host);
915
916 /* Restore power if needed */
917 if (!mmc_card_keep_power(host)) {
918 mmc_power_up(host, host->card->ocr);
919 /*
920 * Tell runtime PM core we just powered up the card,
921 * since it still believes the card is powered off.
922 * Note that currently runtime PM is only enabled
923 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
924 */
925 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
926 pm_runtime_disable(&host->card->dev);
927 pm_runtime_set_active(&host->card->dev);
928 pm_runtime_enable(&host->card->dev);
929 }
930 }
931
932 /* No need to reinitialize powered-resumed nonremovable cards */
933 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
934 sdio_reset(host);
935 mmc_go_idle(host);
936 mmc_send_if_cond(host, host->card->ocr);
937 err = mmc_send_io_op_cond(host, 0, NULL);
938 if (!err)
939 err = mmc_sdio_init_card(host, host->card->ocr,
940 host->card,
941 mmc_card_keep_power(host));
942 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
943 /* We may have switched to 1-bit mode during suspend */
944 err = sdio_enable_4bit_bus(host->card);
945 }
946
947 if (!err && host->sdio_irqs) {
948 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
949 wake_up_process(host->sdio_irq_thread);
950 else if (host->caps & MMC_CAP_SDIO_IRQ)
951 host->ops->enable_sdio_irq(host, 1);
952 }
953
954 mmc_release_host(host);
955
956 host->pm_flags &= ~MMC_PM_KEEP_POWER;
957 return err;
958}
959
960static int mmc_sdio_power_restore(struct mmc_host *host)
961{
962 int ret;
963
964 mmc_claim_host(host);
965
966 /*
967 * Reset the card by performing the same steps that are taken by
968 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
969 *
970 * sdio_reset() is technically not needed. Having just powered up the
971 * hardware, it should already be in reset state. However, some
972 * platforms (such as SD8686 on OLPC) do not instantly cut power,
973 * meaning that a reset is required when restoring power soon after
974 * powering off. It is harmless in other cases.
975 *
976 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
977 * is not necessary for non-removable cards. However, it is required
978 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
979 * harmless in other situations.
980 *
981 */
982
983 sdio_reset(host);
984 mmc_go_idle(host);
985 mmc_send_if_cond(host, host->card->ocr);
986
987 ret = mmc_send_io_op_cond(host, 0, NULL);
988 if (ret)
989 goto out;
990
991 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
992 mmc_card_keep_power(host));
993 if (!ret && host->sdio_irqs)
994 mmc_signal_sdio_irq(host);
995
996out:
997 mmc_release_host(host);
998
999 return ret;
1000}
1001
1002static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1003{
1004 /* No references to the card, cut the power to it. */
1005 mmc_claim_host(host);
1006 mmc_power_off(host);
1007 mmc_release_host(host);
1008
1009 return 0;
1010}
1011
1012static int mmc_sdio_runtime_resume(struct mmc_host *host)
1013{
1014 int ret;
1015
1016 /* Restore power and re-initialize. */
1017 mmc_claim_host(host);
1018 mmc_power_up(host, host->card->ocr);
1019 ret = mmc_sdio_power_restore(host);
1020 mmc_release_host(host);
1021
1022 return ret;
1023}
1024
1025static int mmc_sdio_reset(struct mmc_host *host)
1026{
1027 mmc_power_cycle(host, host->card->ocr);
1028 return mmc_sdio_power_restore(host);
1029}
1030
1031static const struct mmc_bus_ops mmc_sdio_ops = {
1032 .remove = mmc_sdio_remove,
1033 .detect = mmc_sdio_detect,
1034 .pre_suspend = mmc_sdio_pre_suspend,
1035 .suspend = mmc_sdio_suspend,
1036 .resume = mmc_sdio_resume,
1037 .runtime_suspend = mmc_sdio_runtime_suspend,
1038 .runtime_resume = mmc_sdio_runtime_resume,
1039 .power_restore = mmc_sdio_power_restore,
1040 .alive = mmc_sdio_alive,
1041 .reset = mmc_sdio_reset,
1042};
1043
1044
1045/*
1046 * Starting point for SDIO card init.
1047 */
1048int mmc_attach_sdio(struct mmc_host *host)
1049{
1050 int err, i, funcs;
1051 u32 ocr, rocr;
1052 struct mmc_card *card;
1053
1054 WARN_ON(!host->claimed);
1055
1056 err = mmc_send_io_op_cond(host, 0, &ocr);
1057 if (err)
1058 return err;
1059
1060 mmc_attach_bus(host, &mmc_sdio_ops);
1061 if (host->ocr_avail_sdio)
1062 host->ocr_avail = host->ocr_avail_sdio;
1063
1064
1065 rocr = mmc_select_voltage(host, ocr);
1066
1067 /*
1068 * Can we support the voltage(s) of the card(s)?
1069 */
1070 if (!rocr) {
1071 err = -EINVAL;
1072 goto err;
1073 }
1074
1075 /*
1076 * Detect and init the card.
1077 */
1078 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1079 if (err)
1080 goto err;
1081
1082 card = host->card;
1083
1084 /*
1085 * Enable runtime PM only if supported by host+card+board
1086 */
1087 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1088 /*
1089 * Let runtime PM core know our card is active
1090 */
1091 err = pm_runtime_set_active(&card->dev);
1092 if (err)
1093 goto remove;
1094
1095 /*
1096 * Enable runtime PM for this card
1097 */
1098 pm_runtime_enable(&card->dev);
1099 }
1100
1101 /*
1102 * The number of functions on the card is encoded inside
1103 * the ocr.
1104 */
1105 funcs = (ocr & 0x70000000) >> 28;
1106 card->sdio_funcs = 0;
1107
1108 /*
1109 * Initialize (but don't add) all present functions.
1110 */
1111 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1112 err = sdio_init_func(host->card, i + 1);
1113 if (err)
1114 goto remove;
1115
1116 /*
1117 * Enable Runtime PM for this func (if supported)
1118 */
1119 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1120 pm_runtime_enable(&card->sdio_func[i]->dev);
1121 }
1122
1123 /*
1124 * First add the card to the driver model...
1125 */
1126 mmc_release_host(host);
1127 err = mmc_add_card(host->card);
1128 if (err)
1129 goto remove_added;
1130
1131 /*
1132 * ...then the SDIO functions.
1133 */
1134 for (i = 0;i < funcs;i++) {
1135 err = sdio_add_func(host->card->sdio_func[i]);
1136 if (err)
1137 goto remove_added;
1138 }
1139
1140 mmc_claim_host(host);
1141 return 0;
1142
1143
1144remove_added:
1145 /* Remove without lock if the device has been added. */
1146 mmc_sdio_remove(host);
1147 mmc_claim_host(host);
1148remove:
1149 /* And with lock if it hasn't been added. */
1150 mmc_release_host(host);
1151 if (host->card)
1152 mmc_sdio_remove(host);
1153 mmc_claim_host(host);
1154err:
1155 mmc_detach_bus(host);
1156
1157 pr_err("%s: error %d whilst initialising SDIO card\n",
1158 mmc_hostname(host), err);
1159
1160 return err;
1161}
1162