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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 BUG_ON(fn > SDIO_MAX_FUNCS);
67
68 func = sdio_alloc_func(card);
69 if (IS_ERR(func))
70 return PTR_ERR(func);
71
72 func->num = fn;
73
74 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
75 ret = sdio_read_fbr(func);
76 if (ret)
77 goto fail;
78
79 ret = sdio_read_func_cis(func);
80 if (ret)
81 goto fail;
82 } else {
83 func->vendor = func->card->cis.vendor;
84 func->device = func->card->cis.device;
85 func->max_blksize = func->card->cis.blksize;
86 }
87
88 card->sdio_func[fn - 1] = func;
89
90 return 0;
91
92fail:
93 /*
94 * It is okay to remove the function here even though we hold
95 * the host lock as we haven't registered the device yet.
96 */
97 sdio_remove_func(func);
98 return ret;
99}
100
101static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
102{
103 int ret;
104 int cccr_vsn;
105 int uhs = ocr & R4_18V_PRESENT;
106 unsigned char data;
107 unsigned char speed;
108
109 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
110
111 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
112 if (ret)
113 goto out;
114
115 cccr_vsn = data & 0x0f;
116
117 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
118 pr_err("%s: unrecognised CCCR structure version %d\n",
119 mmc_hostname(card->host), cccr_vsn);
120 return -EINVAL;
121 }
122
123 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
124
125 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
126 if (ret)
127 goto out;
128
129 if (data & SDIO_CCCR_CAP_SMB)
130 card->cccr.multi_block = 1;
131 if (data & SDIO_CCCR_CAP_LSC)
132 card->cccr.low_speed = 1;
133 if (data & SDIO_CCCR_CAP_4BLS)
134 card->cccr.wide_bus = 1;
135
136 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
137 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
138 if (ret)
139 goto out;
140
141 if (data & SDIO_POWER_SMPC)
142 card->cccr.high_power = 1;
143 }
144
145 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
146 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
147 if (ret)
148 goto out;
149
150 card->scr.sda_spec3 = 0;
151 card->sw_caps.sd3_bus_mode = 0;
152 card->sw_caps.sd3_drv_type = 0;
153 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
154 card->scr.sda_spec3 = 1;
155 ret = mmc_io_rw_direct(card, 0, 0,
156 SDIO_CCCR_UHS, 0, &data);
157 if (ret)
158 goto out;
159
160 if (card->host->caps &
161 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
162 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
163 MMC_CAP_UHS_DDR50)) {
164 if (data & SDIO_UHS_DDR50)
165 card->sw_caps.sd3_bus_mode
166 |= SD_MODE_UHS_DDR50;
167
168 if (data & SDIO_UHS_SDR50)
169 card->sw_caps.sd3_bus_mode
170 |= SD_MODE_UHS_SDR50;
171
172 if (data & SDIO_UHS_SDR104)
173 card->sw_caps.sd3_bus_mode
174 |= SD_MODE_UHS_SDR104;
175 }
176
177 ret = mmc_io_rw_direct(card, 0, 0,
178 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
179 if (ret)
180 goto out;
181
182 if (data & SDIO_DRIVE_SDTA)
183 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
184 if (data & SDIO_DRIVE_SDTC)
185 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
186 if (data & SDIO_DRIVE_SDTD)
187 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
188 }
189
190 /* if no uhs mode ensure we check for high speed */
191 if (!card->sw_caps.sd3_bus_mode) {
192 if (speed & SDIO_SPEED_SHS) {
193 card->cccr.high_speed = 1;
194 card->sw_caps.hs_max_dtr = 50000000;
195 } else {
196 card->cccr.high_speed = 0;
197 card->sw_caps.hs_max_dtr = 25000000;
198 }
199 }
200 }
201
202out:
203 return ret;
204}
205
206static int sdio_enable_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_MASK) == SDIO_BUS_WIDTH_RESERVED)
222 pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
223 mmc_hostname(card->host), ctrl);
224
225 /* set as 4-bit bus width */
226 ctrl &= ~SDIO_BUS_WIDTH_MASK;
227 ctrl |= SDIO_BUS_WIDTH_4BIT;
228
229 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
230 if (ret)
231 return ret;
232
233 return 1;
234}
235
236/*
237 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
238 * of the card. This may be required on certain setups of boards,
239 * controllers and embedded sdio device which do not need the card's
240 * pull-up. As a result, card detection is disabled and power is saved.
241 */
242static int sdio_disable_cd(struct mmc_card *card)
243{
244 int ret;
245 u8 ctrl;
246
247 if (!mmc_card_disable_cd(card))
248 return 0;
249
250 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
251 if (ret)
252 return ret;
253
254 ctrl |= SDIO_BUS_CD_DISABLE;
255
256 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
257}
258
259/*
260 * Devices that remain active during a system suspend are
261 * put back into 1-bit mode.
262 */
263static int sdio_disable_wide(struct mmc_card *card)
264{
265 int ret;
266 u8 ctrl;
267
268 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
269 return 0;
270
271 if (card->cccr.low_speed && !card->cccr.wide_bus)
272 return 0;
273
274 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
275 if (ret)
276 return ret;
277
278 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
279 return 0;
280
281 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
282 ctrl |= SDIO_BUS_ASYNC_INT;
283
284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
285 if (ret)
286 return ret;
287
288 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
289
290 return 0;
291}
292
293
294static int sdio_enable_4bit_bus(struct mmc_card *card)
295{
296 int err;
297
298 if (card->type == MMC_TYPE_SDIO)
299 return sdio_enable_wide(card);
300
301 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
302 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
303 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
304 if (err)
305 return err;
306 } else
307 return 0;
308
309 err = sdio_enable_wide(card);
310 if (err <= 0)
311 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
312
313 return err;
314}
315
316
317/*
318 * Test if the card supports high-speed mode and, if so, switch to it.
319 */
320static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
321{
322 int ret;
323 u8 speed;
324
325 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
326 return 0;
327
328 if (!card->cccr.high_speed)
329 return 0;
330
331 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
332 if (ret)
333 return ret;
334
335 if (enable)
336 speed |= SDIO_SPEED_EHS;
337 else
338 speed &= ~SDIO_SPEED_EHS;
339
340 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
341 if (ret)
342 return ret;
343
344 return 1;
345}
346
347/*
348 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
349 */
350static int sdio_enable_hs(struct mmc_card *card)
351{
352 int ret;
353
354 ret = mmc_sdio_switch_hs(card, true);
355 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
356 return ret;
357
358 ret = mmc_sd_switch_hs(card);
359 if (ret <= 0)
360 mmc_sdio_switch_hs(card, false);
361
362 return ret;
363}
364
365static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
366{
367 unsigned max_dtr;
368
369 if (mmc_card_highspeed(card)) {
370 /*
371 * The SDIO specification doesn't mention how
372 * the CIS transfer speed register relates to
373 * high-speed, but it seems that 50 MHz is
374 * mandatory.
375 */
376 max_dtr = 50000000;
377 } else {
378 max_dtr = card->cis.max_dtr;
379 }
380
381 if (card->type == MMC_TYPE_SD_COMBO)
382 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
383
384 return max_dtr;
385}
386
387static unsigned char host_drive_to_sdio_drive(int host_strength)
388{
389 switch (host_strength) {
390 case MMC_SET_DRIVER_TYPE_A:
391 return SDIO_DTSx_SET_TYPE_A;
392 case MMC_SET_DRIVER_TYPE_B:
393 return SDIO_DTSx_SET_TYPE_B;
394 case MMC_SET_DRIVER_TYPE_C:
395 return SDIO_DTSx_SET_TYPE_C;
396 case MMC_SET_DRIVER_TYPE_D:
397 return SDIO_DTSx_SET_TYPE_D;
398 default:
399 return SDIO_DTSx_SET_TYPE_B;
400 }
401}
402
403static void sdio_select_driver_type(struct mmc_card *card)
404{
405 int host_drv_type = SD_DRIVER_TYPE_B;
406 int card_drv_type = SD_DRIVER_TYPE_B;
407 int drive_strength;
408 unsigned char card_strength;
409 int err;
410
411 /*
412 * If the host doesn't support any of the Driver Types A,C or D,
413 * or there is no board specific handler then default Driver
414 * Type B is used.
415 */
416 if (!(card->host->caps &
417 (MMC_CAP_DRIVER_TYPE_A |
418 MMC_CAP_DRIVER_TYPE_C |
419 MMC_CAP_DRIVER_TYPE_D)))
420 return;
421
422 if (!card->host->ops->select_drive_strength)
423 return;
424
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
426 host_drv_type |= SD_DRIVER_TYPE_A;
427
428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
429 host_drv_type |= SD_DRIVER_TYPE_C;
430
431 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
432 host_drv_type |= SD_DRIVER_TYPE_D;
433
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
435 card_drv_type |= SD_DRIVER_TYPE_A;
436
437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
438 card_drv_type |= SD_DRIVER_TYPE_C;
439
440 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
441 card_drv_type |= SD_DRIVER_TYPE_D;
442
443 /*
444 * The drive strength that the hardware can support
445 * depends on the board design. Pass the appropriate
446 * information and let the hardware specific code
447 * return what is possible given the options
448 */
449 drive_strength = card->host->ops->select_drive_strength(
450 card->sw_caps.uhs_max_dtr,
451 host_drv_type, card_drv_type);
452
453 /* if error just use default for drive strength B */
454 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
455 &card_strength);
456 if (err)
457 return;
458
459 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
460 card_strength |= host_drive_to_sdio_drive(drive_strength);
461
462 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
463 card_strength, NULL);
464
465 /* if error default to drive strength B */
466 if (!err)
467 mmc_set_driver_type(card->host, drive_strength);
468}
469
470
471static int sdio_set_bus_speed_mode(struct mmc_card *card)
472{
473 unsigned int bus_speed, timing;
474 int err;
475 unsigned char speed;
476
477 /*
478 * If the host doesn't support any of the UHS-I modes, fallback on
479 * default speed.
480 */
481 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
483 return 0;
484
485 bus_speed = SDIO_SPEED_SDR12;
486 timing = MMC_TIMING_UHS_SDR12;
487 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
489 bus_speed = SDIO_SPEED_SDR104;
490 timing = MMC_TIMING_UHS_SDR104;
491 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
492 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
494 bus_speed = SDIO_SPEED_DDR50;
495 timing = MMC_TIMING_UHS_DDR50;
496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
499 SD_MODE_UHS_SDR50)) {
500 bus_speed = SDIO_SPEED_SDR50;
501 timing = MMC_TIMING_UHS_SDR50;
502 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
503 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
504 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
505 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
506 bus_speed = SDIO_SPEED_SDR25;
507 timing = MMC_TIMING_UHS_SDR25;
508 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
509 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
510 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
511 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
512 SD_MODE_UHS_SDR12)) {
513 bus_speed = SDIO_SPEED_SDR12;
514 timing = MMC_TIMING_UHS_SDR12;
515 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516 }
517
518 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
519 if (err)
520 return err;
521
522 speed &= ~SDIO_SPEED_BSS_MASK;
523 speed |= bus_speed;
524 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
525 if (err)
526 return err;
527
528 if (bus_speed) {
529 mmc_set_timing(card->host, timing);
530 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
531 }
532
533 return 0;
534}
535
536/*
537 * UHS-I specific initialization procedure
538 */
539static int mmc_sdio_init_uhs_card(struct mmc_card *card)
540{
541 int err;
542
543 if (!card->scr.sda_spec3)
544 return 0;
545
546 /*
547 * Switch to wider bus (if supported).
548 */
549 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
550 err = sdio_enable_4bit_bus(card);
551 if (err > 0) {
552 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
553 err = 0;
554 }
555 }
556
557 /* Set the driver strength for the card */
558 sdio_select_driver_type(card);
559
560 /* Set bus speed mode of the card */
561 err = sdio_set_bus_speed_mode(card);
562 if (err)
563 goto out;
564
565 /* Initialize and start re-tuning timer */
566 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
567 err = card->host->ops->execute_tuning(card->host,
568 MMC_SEND_TUNING_BLOCK);
569
570out:
571
572 return err;
573}
574
575/*
576 * Handle the detection and initialisation of a card.
577 *
578 * In the case of a resume, "oldcard" will contain the card
579 * we're trying to reinitialise.
580 */
581static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
582 struct mmc_card *oldcard, int powered_resume)
583{
584 struct mmc_card *card;
585 int err;
586
587 BUG_ON(!host);
588 WARN_ON(!host->claimed);
589
590 /*
591 * Inform the card of the voltage
592 */
593 if (!powered_resume) {
594 /* The initialization should be done at 3.3 V I/O voltage. */
595 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
596
597 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
598 if (err)
599 goto err;
600 }
601
602 /*
603 * For SPI, enable CRC as appropriate.
604 */
605 if (mmc_host_is_spi(host)) {
606 err = mmc_spi_set_crc(host, use_spi_crc);
607 if (err)
608 goto err;
609 }
610
611 /*
612 * Allocate card structure.
613 */
614 card = mmc_alloc_card(host, NULL);
615 if (IS_ERR(card)) {
616 err = PTR_ERR(card);
617 goto err;
618 }
619
620 if ((ocr & R4_MEMORY_PRESENT) &&
621 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
622 card->type = MMC_TYPE_SD_COMBO;
623
624 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
625 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
626 mmc_remove_card(card);
627 return -ENOENT;
628 }
629 } else {
630 card->type = MMC_TYPE_SDIO;
631
632 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
633 mmc_remove_card(card);
634 return -ENOENT;
635 }
636 }
637
638 /*
639 * Call the optional HC's init_card function to handle quirks.
640 */
641 if (host->ops->init_card)
642 host->ops->init_card(host, card);
643
644 /*
645 * If the host and card support UHS-I mode request the card
646 * to switch to 1.8V signaling level. No 1.8v signalling if
647 * UHS mode is not enabled to maintain compatibilty and some
648 * systems that claim 1.8v signalling in fact do not support
649 * it.
650 */
651 if ((ocr & R4_18V_PRESENT) &&
652 (host->caps &
653 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
654 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
655 MMC_CAP_UHS_DDR50))) {
656 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
657 true);
658 if (err) {
659 ocr &= ~R4_18V_PRESENT;
660 host->ocr &= ~R4_18V_PRESENT;
661 }
662 err = 0;
663 } else {
664 ocr &= ~R4_18V_PRESENT;
665 host->ocr &= ~R4_18V_PRESENT;
666 }
667
668 /*
669 * For native busses: set card RCA and quit open drain mode.
670 */
671 if (!powered_resume && !mmc_host_is_spi(host)) {
672 err = mmc_send_relative_addr(host, &card->rca);
673 if (err)
674 goto remove;
675
676 /*
677 * Update oldcard with the new RCA received from the SDIO
678 * device -- we're doing this so that it's updated in the
679 * "card" struct when oldcard overwrites that later.
680 */
681 if (oldcard)
682 oldcard->rca = card->rca;
683 }
684
685 /*
686 * Read CSD, before selecting the card
687 */
688 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
689 err = mmc_sd_get_csd(host, card);
690 if (err)
691 return err;
692
693 mmc_decode_cid(card);
694 }
695
696 /*
697 * Select card, as all following commands rely on that.
698 */
699 if (!powered_resume && !mmc_host_is_spi(host)) {
700 err = mmc_select_card(card);
701 if (err)
702 goto remove;
703 }
704
705 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
706 /*
707 * This is non-standard SDIO device, meaning it doesn't
708 * have any CIA (Common I/O area) registers present.
709 * It's host's responsibility to fill cccr and cis
710 * structures in init_card().
711 */
712 mmc_set_clock(host, card->cis.max_dtr);
713
714 if (card->cccr.high_speed) {
715 mmc_card_set_highspeed(card);
716 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
717 }
718
719 goto finish;
720 }
721
722 /*
723 * Read the common registers.
724 */
725 err = sdio_read_cccr(card, ocr);
726 if (err)
727 goto remove;
728
729 /*
730 * Read the common CIS tuples.
731 */
732 err = sdio_read_common_cis(card);
733 if (err)
734 goto remove;
735
736 if (oldcard) {
737 int same = (card->cis.vendor == oldcard->cis.vendor &&
738 card->cis.device == oldcard->cis.device);
739 mmc_remove_card(card);
740 if (!same)
741 return -ENOENT;
742
743 card = oldcard;
744 }
745 mmc_fixup_device(card, NULL);
746
747 if (card->type == MMC_TYPE_SD_COMBO) {
748 err = mmc_sd_setup_card(host, card, oldcard != NULL);
749 /* handle as SDIO-only card if memory init failed */
750 if (err) {
751 mmc_go_idle(host);
752 if (mmc_host_is_spi(host))
753 /* should not fail, as it worked previously */
754 mmc_spi_set_crc(host, use_spi_crc);
755 card->type = MMC_TYPE_SDIO;
756 } else
757 card->dev.type = &sd_type;
758 }
759
760 /*
761 * If needed, disconnect card detection pull-up resistor.
762 */
763 err = sdio_disable_cd(card);
764 if (err)
765 goto remove;
766
767 /* Initialization sequence for UHS-I cards */
768 /* Only if card supports 1.8v and UHS signaling */
769 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
770 err = mmc_sdio_init_uhs_card(card);
771 if (err)
772 goto remove;
773
774 /* Card is an ultra-high-speed card */
775 mmc_card_set_uhs(card);
776 } else {
777 /*
778 * Switch to high-speed (if supported).
779 */
780 err = sdio_enable_hs(card);
781 if (err > 0)
782 mmc_sd_go_highspeed(card);
783 else if (err)
784 goto remove;
785
786 /*
787 * Change to the card's maximum speed.
788 */
789 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
790
791 /*
792 * Switch to wider bus (if supported).
793 */
794 err = sdio_enable_4bit_bus(card);
795 if (err > 0)
796 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
797 else if (err)
798 goto remove;
799 }
800finish:
801 if (!oldcard)
802 host->card = card;
803 return 0;
804
805remove:
806 if (!oldcard)
807 mmc_remove_card(card);
808
809err:
810 return err;
811}
812
813/*
814 * Host is being removed. Free up the current card.
815 */
816static void mmc_sdio_remove(struct mmc_host *host)
817{
818 int i;
819
820 BUG_ON(!host);
821 BUG_ON(!host->card);
822
823 for (i = 0;i < host->card->sdio_funcs;i++) {
824 if (host->card->sdio_func[i]) {
825 sdio_remove_func(host->card->sdio_func[i]);
826 host->card->sdio_func[i] = NULL;
827 }
828 }
829
830 mmc_remove_card(host->card);
831 host->card = NULL;
832}
833
834/*
835 * Card detection - card is alive.
836 */
837static int mmc_sdio_alive(struct mmc_host *host)
838{
839 return mmc_select_card(host->card);
840}
841
842/*
843 * Card detection callback from host.
844 */
845static void mmc_sdio_detect(struct mmc_host *host)
846{
847 int err;
848
849 BUG_ON(!host);
850 BUG_ON(!host->card);
851
852 /* Make sure card is powered before detecting it */
853 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
854 err = pm_runtime_get_sync(&host->card->dev);
855 if (err < 0)
856 goto out;
857 }
858
859 mmc_claim_host(host);
860
861 /*
862 * Just check if our card has been removed.
863 */
864 err = _mmc_detect_card_removed(host);
865
866 mmc_release_host(host);
867
868 /*
869 * Tell PM core it's OK to power off the card now.
870 *
871 * The _sync variant is used in order to ensure that the card
872 * is left powered off in case an error occurred, and the card
873 * is going to be removed.
874 *
875 * Since there is no specific reason to believe a new user
876 * is about to show up at this point, the _sync variant is
877 * desirable anyway.
878 */
879 if (host->caps & MMC_CAP_POWER_OFF_CARD)
880 pm_runtime_put_sync(&host->card->dev);
881
882out:
883 if (err) {
884 mmc_sdio_remove(host);
885
886 mmc_claim_host(host);
887 mmc_detach_bus(host);
888 mmc_power_off(host);
889 mmc_release_host(host);
890 }
891}
892
893/*
894 * SDIO suspend. We need to suspend all functions separately.
895 * Therefore all registered functions must have drivers with suspend
896 * and resume methods. Failing that we simply remove the whole card.
897 */
898static int mmc_sdio_suspend(struct mmc_host *host)
899{
900 int i, err = 0;
901
902 for (i = 0; i < host->card->sdio_funcs; i++) {
903 struct sdio_func *func = host->card->sdio_func[i];
904 if (func && sdio_func_present(func) && func->dev.driver) {
905 const struct dev_pm_ops *pmops = func->dev.driver->pm;
906 if (!pmops || !pmops->suspend || !pmops->resume) {
907 /* force removal of entire card in that case */
908 err = -ENOSYS;
909 } else
910 err = pmops->suspend(&func->dev);
911 if (err)
912 break;
913 }
914 }
915 while (err && --i >= 0) {
916 struct sdio_func *func = host->card->sdio_func[i];
917 if (func && sdio_func_present(func) && func->dev.driver) {
918 const struct dev_pm_ops *pmops = func->dev.driver->pm;
919 pmops->resume(&func->dev);
920 }
921 }
922
923 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
924 mmc_claim_host(host);
925 sdio_disable_wide(host->card);
926 mmc_release_host(host);
927 }
928
929 return err;
930}
931
932static int mmc_sdio_resume(struct mmc_host *host)
933{
934 int i, err = 0;
935
936 BUG_ON(!host);
937 BUG_ON(!host->card);
938
939 /* Basic card reinitialization. */
940 mmc_claim_host(host);
941
942 /* No need to reinitialize powered-resumed nonremovable cards */
943 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
944 err = mmc_sdio_init_card(host, host->ocr, host->card,
945 mmc_card_keep_power(host));
946 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
947 /* We may have switched to 1-bit mode during suspend */
948 err = sdio_enable_4bit_bus(host->card);
949 if (err > 0) {
950 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
951 err = 0;
952 }
953 }
954
955 if (!err && host->sdio_irqs)
956 wake_up_process(host->sdio_irq_thread);
957 mmc_release_host(host);
958
959 /*
960 * If the card looked to be the same as before suspending, then
961 * we proceed to resume all card functions. If one of them returns
962 * an error then we simply return that error to the core and the
963 * card will be redetected as new. It is the responsibility of
964 * the function driver to perform further tests with the extra
965 * knowledge it has of the card to confirm the card is indeed the
966 * same as before suspending (same MAC address for network cards,
967 * etc.) and return an error otherwise.
968 */
969 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
970 struct sdio_func *func = host->card->sdio_func[i];
971 if (func && sdio_func_present(func) && func->dev.driver) {
972 const struct dev_pm_ops *pmops = func->dev.driver->pm;
973 err = pmops->resume(&func->dev);
974 }
975 }
976
977 return err;
978}
979
980static int mmc_sdio_power_restore(struct mmc_host *host)
981{
982 int ret;
983 u32 ocr;
984
985 BUG_ON(!host);
986 BUG_ON(!host->card);
987
988 mmc_claim_host(host);
989
990 /*
991 * Reset the card by performing the same steps that are taken by
992 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
993 *
994 * sdio_reset() is technically not needed. Having just powered up the
995 * hardware, it should already be in reset state. However, some
996 * platforms (such as SD8686 on OLPC) do not instantly cut power,
997 * meaning that a reset is required when restoring power soon after
998 * powering off. It is harmless in other cases.
999 *
1000 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1001 * is not necessary for non-removable cards. However, it is required
1002 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1003 * harmless in other situations.
1004 *
1005 * With these steps taken, mmc_select_voltage() is also required to
1006 * restore the correct voltage setting of the card.
1007 */
1008
1009 /* The initialization should be done at 3.3 V I/O voltage. */
1010 if (!mmc_card_keep_power(host))
1011 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1012
1013 sdio_reset(host);
1014 mmc_go_idle(host);
1015 mmc_send_if_cond(host, host->ocr_avail);
1016
1017 ret = mmc_send_io_op_cond(host, 0, &ocr);
1018 if (ret)
1019 goto out;
1020
1021 if (host->ocr_avail_sdio)
1022 host->ocr_avail = host->ocr_avail_sdio;
1023
1024 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1025 if (!host->ocr) {
1026 ret = -EINVAL;
1027 goto out;
1028 }
1029
1030 ret = mmc_sdio_init_card(host, host->ocr, host->card,
1031 mmc_card_keep_power(host));
1032 if (!ret && host->sdio_irqs)
1033 mmc_signal_sdio_irq(host);
1034
1035out:
1036 mmc_release_host(host);
1037
1038 return ret;
1039}
1040
1041static const struct mmc_bus_ops mmc_sdio_ops = {
1042 .remove = mmc_sdio_remove,
1043 .detect = mmc_sdio_detect,
1044 .suspend = mmc_sdio_suspend,
1045 .resume = mmc_sdio_resume,
1046 .power_restore = mmc_sdio_power_restore,
1047 .alive = mmc_sdio_alive,
1048};
1049
1050
1051/*
1052 * Starting point for SDIO card init.
1053 */
1054int mmc_attach_sdio(struct mmc_host *host)
1055{
1056 int err, i, funcs;
1057 u32 ocr;
1058 struct mmc_card *card;
1059
1060 BUG_ON(!host);
1061 WARN_ON(!host->claimed);
1062
1063 err = mmc_send_io_op_cond(host, 0, &ocr);
1064 if (err)
1065 return err;
1066
1067 mmc_attach_bus(host, &mmc_sdio_ops);
1068 if (host->ocr_avail_sdio)
1069 host->ocr_avail = host->ocr_avail_sdio;
1070
1071 /*
1072 * Sanity check the voltages that the card claims to
1073 * support.
1074 */
1075 if (ocr & 0x7F) {
1076 pr_warning("%s: card claims to support voltages "
1077 "below the defined range. These will be ignored.\n",
1078 mmc_hostname(host));
1079 ocr &= ~0x7F;
1080 }
1081
1082 host->ocr = mmc_select_voltage(host, ocr);
1083
1084 /*
1085 * Can we support the voltage(s) of the card(s)?
1086 */
1087 if (!host->ocr) {
1088 err = -EINVAL;
1089 goto err;
1090 }
1091
1092 /*
1093 * Detect and init the card.
1094 */
1095 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1096 if (err) {
1097 if (err == -EAGAIN) {
1098 /*
1099 * Retry initialization with S18R set to 0.
1100 */
1101 host->ocr &= ~R4_18V_PRESENT;
1102 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1103 }
1104 if (err)
1105 goto err;
1106 }
1107 card = host->card;
1108
1109 /*
1110 * Enable runtime PM only if supported by host+card+board
1111 */
1112 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1113 /*
1114 * Let runtime PM core know our card is active
1115 */
1116 err = pm_runtime_set_active(&card->dev);
1117 if (err)
1118 goto remove;
1119
1120 /*
1121 * Enable runtime PM for this card
1122 */
1123 pm_runtime_enable(&card->dev);
1124 }
1125
1126 /*
1127 * The number of functions on the card is encoded inside
1128 * the ocr.
1129 */
1130 funcs = (ocr & 0x70000000) >> 28;
1131 card->sdio_funcs = 0;
1132
1133 /*
1134 * Initialize (but don't add) all present functions.
1135 */
1136 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1137 err = sdio_init_func(host->card, i + 1);
1138 if (err)
1139 goto remove;
1140
1141 /*
1142 * Enable Runtime PM for this func (if supported)
1143 */
1144 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1145 pm_runtime_enable(&card->sdio_func[i]->dev);
1146 }
1147
1148 /*
1149 * First add the card to the driver model...
1150 */
1151 mmc_release_host(host);
1152 err = mmc_add_card(host->card);
1153 if (err)
1154 goto remove_added;
1155
1156 /*
1157 * ...then the SDIO functions.
1158 */
1159 for (i = 0;i < funcs;i++) {
1160 err = sdio_add_func(host->card->sdio_func[i]);
1161 if (err)
1162 goto remove_added;
1163 }
1164
1165 mmc_claim_host(host);
1166 return 0;
1167
1168
1169remove_added:
1170 /* Remove without lock if the device has been added. */
1171 mmc_sdio_remove(host);
1172 mmc_claim_host(host);
1173remove:
1174 /* And with lock if it hasn't been added. */
1175 mmc_release_host(host);
1176 if (host->card)
1177 mmc_sdio_remove(host);
1178 mmc_claim_host(host);
1179err:
1180 mmc_detach_bus(host);
1181
1182 pr_err("%s: error %d whilst initialising SDIO card\n",
1183 mmc_hostname(host), err);
1184
1185 return err;
1186}
1187