Loading...
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 "card.h"
24#include "host.h"
25#include "bus.h"
26#include "quirks.h"
27#include "sd.h"
28#include "sdio_bus.h"
29#include "mmc_ops.h"
30#include "sd_ops.h"
31#include "sdio_ops.h"
32#include "sdio_cis.h"
33
34static int sdio_read_fbr(struct sdio_func *func)
35{
36 int ret;
37 unsigned char data;
38
39 if (mmc_card_nonstd_func_interface(func->card)) {
40 func->class = SDIO_CLASS_NONE;
41 return 0;
42 }
43
44 ret = mmc_io_rw_direct(func->card, 0, 0,
45 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
46 if (ret)
47 goto out;
48
49 data &= 0x0f;
50
51 if (data == 0x0f) {
52 ret = mmc_io_rw_direct(func->card, 0, 0,
53 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
54 if (ret)
55 goto out;
56 }
57
58 func->class = data;
59
60out:
61 return ret;
62}
63
64static int sdio_init_func(struct mmc_card *card, unsigned int fn)
65{
66 int ret;
67 struct sdio_func *func;
68
69 if (WARN_ON(fn > SDIO_MAX_FUNCS))
70 return -EINVAL;
71
72 func = sdio_alloc_func(card);
73 if (IS_ERR(func))
74 return PTR_ERR(func);
75
76 func->num = fn;
77
78 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
79 ret = sdio_read_fbr(func);
80 if (ret)
81 goto fail;
82
83 ret = sdio_read_func_cis(func);
84 if (ret)
85 goto fail;
86 } else {
87 func->vendor = func->card->cis.vendor;
88 func->device = func->card->cis.device;
89 func->max_blksize = func->card->cis.blksize;
90 }
91
92 card->sdio_func[fn - 1] = func;
93
94 return 0;
95
96fail:
97 /*
98 * It is okay to remove the function here even though we hold
99 * the host lock as we haven't registered the device yet.
100 */
101 sdio_remove_func(func);
102 return ret;
103}
104
105static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
106{
107 int ret;
108 int cccr_vsn;
109 int uhs = ocr & R4_18V_PRESENT;
110 unsigned char data;
111 unsigned char speed;
112
113 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
114 if (ret)
115 goto out;
116
117 cccr_vsn = data & 0x0f;
118
119 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
120 pr_err("%s: unrecognised CCCR structure version %d\n",
121 mmc_hostname(card->host), cccr_vsn);
122 return -EINVAL;
123 }
124
125 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
126
127 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
128 if (ret)
129 goto out;
130
131 if (data & SDIO_CCCR_CAP_SMB)
132 card->cccr.multi_block = 1;
133 if (data & SDIO_CCCR_CAP_LSC)
134 card->cccr.low_speed = 1;
135 if (data & SDIO_CCCR_CAP_4BLS)
136 card->cccr.wide_bus = 1;
137
138 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
139 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
140 if (ret)
141 goto out;
142
143 if (data & SDIO_POWER_SMPC)
144 card->cccr.high_power = 1;
145 }
146
147 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
148 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
149 if (ret)
150 goto out;
151
152 card->scr.sda_spec3 = 0;
153 card->sw_caps.sd3_bus_mode = 0;
154 card->sw_caps.sd3_drv_type = 0;
155 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
156 card->scr.sda_spec3 = 1;
157 ret = mmc_io_rw_direct(card, 0, 0,
158 SDIO_CCCR_UHS, 0, &data);
159 if (ret)
160 goto out;
161
162 if (mmc_host_uhs(card->host)) {
163 if (data & SDIO_UHS_DDR50)
164 card->sw_caps.sd3_bus_mode
165 |= SD_MODE_UHS_DDR50;
166
167 if (data & SDIO_UHS_SDR50)
168 card->sw_caps.sd3_bus_mode
169 |= SD_MODE_UHS_SDR50;
170
171 if (data & SDIO_UHS_SDR104)
172 card->sw_caps.sd3_bus_mode
173 |= SD_MODE_UHS_SDR104;
174 }
175
176 ret = mmc_io_rw_direct(card, 0, 0,
177 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
178 if (ret)
179 goto out;
180
181 if (data & SDIO_DRIVE_SDTA)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
183 if (data & SDIO_DRIVE_SDTC)
184 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
185 if (data & SDIO_DRIVE_SDTD)
186 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
187 }
188
189 /* if no uhs mode ensure we check for high speed */
190 if (!card->sw_caps.sd3_bus_mode) {
191 if (speed & SDIO_SPEED_SHS) {
192 card->cccr.high_speed = 1;
193 card->sw_caps.hs_max_dtr = 50000000;
194 } else {
195 card->cccr.high_speed = 0;
196 card->sw_caps.hs_max_dtr = 25000000;
197 }
198 }
199 }
200
201out:
202 return ret;
203}
204
205static int sdio_enable_wide(struct mmc_card *card)
206{
207 int ret;
208 u8 ctrl;
209
210 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
211 return 0;
212
213 if (card->cccr.low_speed && !card->cccr.wide_bus)
214 return 0;
215
216 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
217 if (ret)
218 return ret;
219
220 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
221 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
222 mmc_hostname(card->host), ctrl);
223
224 /* set as 4-bit bus width */
225 ctrl &= ~SDIO_BUS_WIDTH_MASK;
226 ctrl |= SDIO_BUS_WIDTH_4BIT;
227
228 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
229 if (ret)
230 return ret;
231
232 return 1;
233}
234
235/*
236 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
237 * of the card. This may be required on certain setups of boards,
238 * controllers and embedded sdio device which do not need the card's
239 * pull-up. As a result, card detection is disabled and power is saved.
240 */
241static int sdio_disable_cd(struct mmc_card *card)
242{
243 int ret;
244 u8 ctrl;
245
246 if (!mmc_card_disable_cd(card))
247 return 0;
248
249 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
250 if (ret)
251 return ret;
252
253 ctrl |= SDIO_BUS_CD_DISABLE;
254
255 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
256}
257
258/*
259 * Devices that remain active during a system suspend are
260 * put back into 1-bit mode.
261 */
262static int sdio_disable_wide(struct mmc_card *card)
263{
264 int ret;
265 u8 ctrl;
266
267 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
268 return 0;
269
270 if (card->cccr.low_speed && !card->cccr.wide_bus)
271 return 0;
272
273 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
274 if (ret)
275 return ret;
276
277 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
278 return 0;
279
280 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
281 ctrl |= SDIO_BUS_ASYNC_INT;
282
283 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
284 if (ret)
285 return ret;
286
287 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
288
289 return 0;
290}
291
292
293static int sdio_enable_4bit_bus(struct mmc_card *card)
294{
295 int err;
296
297 if (card->type == MMC_TYPE_SDIO)
298 err = sdio_enable_wide(card);
299 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
300 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
301 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
302 if (err)
303 return err;
304 err = sdio_enable_wide(card);
305 if (err <= 0)
306 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
307 } else
308 return 0;
309
310 if (err > 0) {
311 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
312 err = 0;
313 }
314
315 return err;
316}
317
318
319/*
320 * Test if the card supports high-speed mode and, if so, switch to it.
321 */
322static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
323{
324 int ret;
325 u8 speed;
326
327 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
328 return 0;
329
330 if (!card->cccr.high_speed)
331 return 0;
332
333 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
334 if (ret)
335 return ret;
336
337 if (enable)
338 speed |= SDIO_SPEED_EHS;
339 else
340 speed &= ~SDIO_SPEED_EHS;
341
342 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
343 if (ret)
344 return ret;
345
346 return 1;
347}
348
349/*
350 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
351 */
352static int sdio_enable_hs(struct mmc_card *card)
353{
354 int ret;
355
356 ret = mmc_sdio_switch_hs(card, true);
357 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
358 return ret;
359
360 ret = mmc_sd_switch_hs(card);
361 if (ret <= 0)
362 mmc_sdio_switch_hs(card, false);
363
364 return ret;
365}
366
367static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
368{
369 unsigned max_dtr;
370
371 if (mmc_card_hs(card)) {
372 /*
373 * The SDIO specification doesn't mention how
374 * the CIS transfer speed register relates to
375 * high-speed, but it seems that 50 MHz is
376 * mandatory.
377 */
378 max_dtr = 50000000;
379 } else {
380 max_dtr = card->cis.max_dtr;
381 }
382
383 if (card->type == MMC_TYPE_SD_COMBO)
384 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
385
386 return max_dtr;
387}
388
389static unsigned char host_drive_to_sdio_drive(int host_strength)
390{
391 switch (host_strength) {
392 case MMC_SET_DRIVER_TYPE_A:
393 return SDIO_DTSx_SET_TYPE_A;
394 case MMC_SET_DRIVER_TYPE_B:
395 return SDIO_DTSx_SET_TYPE_B;
396 case MMC_SET_DRIVER_TYPE_C:
397 return SDIO_DTSx_SET_TYPE_C;
398 case MMC_SET_DRIVER_TYPE_D:
399 return SDIO_DTSx_SET_TYPE_D;
400 default:
401 return SDIO_DTSx_SET_TYPE_B;
402 }
403}
404
405static void sdio_select_driver_type(struct mmc_card *card)
406{
407 int card_drv_type, drive_strength, drv_type;
408 unsigned char card_strength;
409 int err;
410
411 card->drive_strength = 0;
412
413 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
414
415 drive_strength = mmc_select_drive_strength(card,
416 card->sw_caps.uhs_max_dtr,
417 card_drv_type, &drv_type);
418
419 if (drive_strength) {
420 /* if error just use default for drive strength B */
421 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
422 &card_strength);
423 if (err)
424 return;
425
426 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
427 card_strength |= host_drive_to_sdio_drive(drive_strength);
428
429 /* if error default to drive strength B */
430 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
431 card_strength, NULL);
432 if (err)
433 return;
434 card->drive_strength = drive_strength;
435 }
436
437 if (drv_type)
438 mmc_set_driver_type(card->host, drv_type);
439}
440
441
442static int sdio_set_bus_speed_mode(struct mmc_card *card)
443{
444 unsigned int bus_speed, timing;
445 int err;
446 unsigned char speed;
447
448 /*
449 * If the host doesn't support any of the UHS-I modes, fallback on
450 * default speed.
451 */
452 if (!mmc_host_uhs(card->host))
453 return 0;
454
455 bus_speed = SDIO_SPEED_SDR12;
456 timing = MMC_TIMING_UHS_SDR12;
457 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
458 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
459 bus_speed = SDIO_SPEED_SDR104;
460 timing = MMC_TIMING_UHS_SDR104;
461 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
462 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
463 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
465 bus_speed = SDIO_SPEED_DDR50;
466 timing = MMC_TIMING_UHS_DDR50;
467 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
468 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
469 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
470 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
471 SD_MODE_UHS_SDR50)) {
472 bus_speed = SDIO_SPEED_SDR50;
473 timing = MMC_TIMING_UHS_SDR50;
474 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
475 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
476 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
477 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
478 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
479 bus_speed = SDIO_SPEED_SDR25;
480 timing = MMC_TIMING_UHS_SDR25;
481 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
482 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
483 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
484 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
485 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
486 SD_MODE_UHS_SDR12)) {
487 bus_speed = SDIO_SPEED_SDR12;
488 timing = MMC_TIMING_UHS_SDR12;
489 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
490 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
491 }
492
493 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
494 if (err)
495 return err;
496
497 speed &= ~SDIO_SPEED_BSS_MASK;
498 speed |= bus_speed;
499 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
500 if (err)
501 return err;
502
503 if (bus_speed) {
504 mmc_set_timing(card->host, timing);
505 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
506 }
507
508 return 0;
509}
510
511/*
512 * UHS-I specific initialization procedure
513 */
514static int mmc_sdio_init_uhs_card(struct mmc_card *card)
515{
516 int err;
517
518 if (!card->scr.sda_spec3)
519 return 0;
520
521 /* Switch to wider bus */
522 err = sdio_enable_4bit_bus(card);
523 if (err)
524 goto out;
525
526 /* Set the driver strength for the card */
527 sdio_select_driver_type(card);
528
529 /* Set bus speed mode of the card */
530 err = sdio_set_bus_speed_mode(card);
531 if (err)
532 goto out;
533
534 /*
535 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
536 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
537 */
538 if (!mmc_host_is_spi(card->host) &&
539 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
540 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
541 err = mmc_execute_tuning(card);
542out:
543 return err;
544}
545
546static void mmc_sdio_resend_if_cond(struct mmc_host *host,
547 struct mmc_card *card)
548{
549 sdio_reset(host);
550 mmc_go_idle(host);
551 mmc_send_if_cond(host, host->ocr_avail);
552 mmc_remove_card(card);
553}
554
555/*
556 * Handle the detection and initialisation of a card.
557 *
558 * In the case of a resume, "oldcard" will contain the card
559 * we're trying to reinitialise.
560 */
561static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
562 struct mmc_card *oldcard, int powered_resume)
563{
564 struct mmc_card *card;
565 int err;
566 int retries = 10;
567 u32 rocr = 0;
568 u32 ocr_card = ocr;
569
570 WARN_ON(!host->claimed);
571
572 /* to query card if 1.8V signalling is supported */
573 if (mmc_host_uhs(host))
574 ocr |= R4_18V_PRESENT;
575
576try_again:
577 if (!retries) {
578 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
579 ocr &= ~R4_18V_PRESENT;
580 }
581
582 /*
583 * Inform the card of the voltage
584 */
585 if (!powered_resume) {
586 err = mmc_send_io_op_cond(host, ocr, &rocr);
587 if (err)
588 goto err;
589 }
590
591 /*
592 * For SPI, enable CRC as appropriate.
593 */
594 if (mmc_host_is_spi(host)) {
595 err = mmc_spi_set_crc(host, use_spi_crc);
596 if (err)
597 goto err;
598 }
599
600 /*
601 * Allocate card structure.
602 */
603 card = mmc_alloc_card(host, NULL);
604 if (IS_ERR(card)) {
605 err = PTR_ERR(card);
606 goto err;
607 }
608
609 if ((rocr & R4_MEMORY_PRESENT) &&
610 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
611 card->type = MMC_TYPE_SD_COMBO;
612
613 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
614 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
615 mmc_remove_card(card);
616 return -ENOENT;
617 }
618 } else {
619 card->type = MMC_TYPE_SDIO;
620
621 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
622 mmc_remove_card(card);
623 return -ENOENT;
624 }
625 }
626
627 /*
628 * Call the optional HC's init_card function to handle quirks.
629 */
630 if (host->ops->init_card)
631 host->ops->init_card(host, card);
632
633 /*
634 * If the host and card support UHS-I mode request the card
635 * to switch to 1.8V signaling level. No 1.8v signalling if
636 * UHS mode is not enabled to maintain compatibility and some
637 * systems that claim 1.8v signalling in fact do not support
638 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
639 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
640 * fails to check rocr & R4_18V_PRESENT, but we still need to
641 * try to init uhs card. sdio_read_cccr will take over this task
642 * to make sure which speed mode should work.
643 */
644 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
645 err = mmc_set_uhs_voltage(host, ocr_card);
646 if (err == -EAGAIN) {
647 mmc_sdio_resend_if_cond(host, card);
648 retries--;
649 goto try_again;
650 } else if (err) {
651 ocr &= ~R4_18V_PRESENT;
652 }
653 }
654
655 /*
656 * For native busses: set card RCA and quit open drain mode.
657 */
658 if (!powered_resume && !mmc_host_is_spi(host)) {
659 err = mmc_send_relative_addr(host, &card->rca);
660 if (err)
661 goto remove;
662
663 /*
664 * Update oldcard with the new RCA received from the SDIO
665 * device -- we're doing this so that it's updated in the
666 * "card" struct when oldcard overwrites that later.
667 */
668 if (oldcard)
669 oldcard->rca = card->rca;
670 }
671
672 /*
673 * Read CSD, before selecting the card
674 */
675 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
676 err = mmc_sd_get_csd(host, card);
677 if (err)
678 return err;
679
680 mmc_decode_cid(card);
681 }
682
683 /*
684 * Select card, as all following commands rely on that.
685 */
686 if (!powered_resume && !mmc_host_is_spi(host)) {
687 err = mmc_select_card(card);
688 if (err)
689 goto remove;
690 }
691
692 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
693 /*
694 * This is non-standard SDIO device, meaning it doesn't
695 * have any CIA (Common I/O area) registers present.
696 * It's host's responsibility to fill cccr and cis
697 * structures in init_card().
698 */
699 mmc_set_clock(host, card->cis.max_dtr);
700
701 if (card->cccr.high_speed) {
702 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
703 }
704
705 goto finish;
706 }
707
708 /*
709 * Read the common registers. Note that we should try to
710 * validate whether UHS would work or not.
711 */
712 err = sdio_read_cccr(card, ocr);
713 if (err) {
714 mmc_sdio_resend_if_cond(host, card);
715 if (ocr & R4_18V_PRESENT) {
716 /* Retry init sequence, but without R4_18V_PRESENT. */
717 retries = 0;
718 goto try_again;
719 } else {
720 goto remove;
721 }
722 }
723
724 /*
725 * Read the common CIS tuples.
726 */
727 err = sdio_read_common_cis(card);
728 if (err)
729 goto remove;
730
731 if (oldcard) {
732 int same = (card->cis.vendor == oldcard->cis.vendor &&
733 card->cis.device == oldcard->cis.device);
734 mmc_remove_card(card);
735 if (!same)
736 return -ENOENT;
737
738 card = oldcard;
739 }
740 card->ocr = ocr_card;
741 mmc_fixup_device(card, sdio_fixup_methods);
742
743 if (card->type == MMC_TYPE_SD_COMBO) {
744 err = mmc_sd_setup_card(host, card, oldcard != NULL);
745 /* handle as SDIO-only card if memory init failed */
746 if (err) {
747 mmc_go_idle(host);
748 if (mmc_host_is_spi(host))
749 /* should not fail, as it worked previously */
750 mmc_spi_set_crc(host, use_spi_crc);
751 card->type = MMC_TYPE_SDIO;
752 } else
753 card->dev.type = &sd_type;
754 }
755
756 /*
757 * If needed, disconnect card detection pull-up resistor.
758 */
759 err = sdio_disable_cd(card);
760 if (err)
761 goto remove;
762
763 /* Initialization sequence for UHS-I cards */
764 /* Only if card supports 1.8v and UHS signaling */
765 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
766 err = mmc_sdio_init_uhs_card(card);
767 if (err)
768 goto remove;
769 } else {
770 /*
771 * Switch to high-speed (if supported).
772 */
773 err = sdio_enable_hs(card);
774 if (err > 0)
775 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
776 else if (err)
777 goto remove;
778
779 /*
780 * Change to the card's maximum speed.
781 */
782 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
783
784 /*
785 * Switch to wider bus (if supported).
786 */
787 err = sdio_enable_4bit_bus(card);
788 if (err)
789 goto remove;
790 }
791finish:
792 if (!oldcard)
793 host->card = card;
794 return 0;
795
796remove:
797 if (!oldcard)
798 mmc_remove_card(card);
799
800err:
801 return err;
802}
803
804/*
805 * Host is being removed. Free up the current card.
806 */
807static void mmc_sdio_remove(struct mmc_host *host)
808{
809 int i;
810
811 for (i = 0;i < host->card->sdio_funcs;i++) {
812 if (host->card->sdio_func[i]) {
813 sdio_remove_func(host->card->sdio_func[i]);
814 host->card->sdio_func[i] = NULL;
815 }
816 }
817
818 mmc_remove_card(host->card);
819 host->card = NULL;
820}
821
822/*
823 * Card detection - card is alive.
824 */
825static int mmc_sdio_alive(struct mmc_host *host)
826{
827 return mmc_select_card(host->card);
828}
829
830/*
831 * Card detection callback from host.
832 */
833static void mmc_sdio_detect(struct mmc_host *host)
834{
835 int err;
836
837 /* Make sure card is powered before detecting it */
838 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
839 err = pm_runtime_get_sync(&host->card->dev);
840 if (err < 0) {
841 pm_runtime_put_noidle(&host->card->dev);
842 goto out;
843 }
844 }
845
846 mmc_claim_host(host);
847
848 /*
849 * Just check if our card has been removed.
850 */
851 err = _mmc_detect_card_removed(host);
852
853 mmc_release_host(host);
854
855 /*
856 * Tell PM core it's OK to power off the card now.
857 *
858 * The _sync variant is used in order to ensure that the card
859 * is left powered off in case an error occurred, and the card
860 * is going to be removed.
861 *
862 * Since there is no specific reason to believe a new user
863 * is about to show up at this point, the _sync variant is
864 * desirable anyway.
865 */
866 if (host->caps & MMC_CAP_POWER_OFF_CARD)
867 pm_runtime_put_sync(&host->card->dev);
868
869out:
870 if (err) {
871 mmc_sdio_remove(host);
872
873 mmc_claim_host(host);
874 mmc_detach_bus(host);
875 mmc_power_off(host);
876 mmc_release_host(host);
877 }
878}
879
880/*
881 * SDIO pre_suspend. We need to suspend all functions separately.
882 * Therefore all registered functions must have drivers with suspend
883 * and resume methods. Failing that we simply remove the whole card.
884 */
885static int mmc_sdio_pre_suspend(struct mmc_host *host)
886{
887 int i, err = 0;
888
889 for (i = 0; i < host->card->sdio_funcs; i++) {
890 struct sdio_func *func = host->card->sdio_func[i];
891 if (func && sdio_func_present(func) && func->dev.driver) {
892 const struct dev_pm_ops *pmops = func->dev.driver->pm;
893 if (!pmops || !pmops->suspend || !pmops->resume) {
894 /* force removal of entire card in that case */
895 err = -ENOSYS;
896 break;
897 }
898 }
899 }
900
901 return err;
902}
903
904/*
905 * SDIO suspend. Suspend all functions separately.
906 */
907static int mmc_sdio_suspend(struct mmc_host *host)
908{
909 mmc_claim_host(host);
910
911 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
912 sdio_disable_wide(host->card);
913
914 if (!mmc_card_keep_power(host)) {
915 mmc_power_off(host);
916 } else if (host->retune_period) {
917 mmc_retune_timer_stop(host);
918 mmc_retune_needed(host);
919 }
920
921 mmc_release_host(host);
922
923 return 0;
924}
925
926static int mmc_sdio_resume(struct mmc_host *host)
927{
928 int err = 0;
929
930 /* Basic card reinitialization. */
931 mmc_claim_host(host);
932
933 /* Restore power if needed */
934 if (!mmc_card_keep_power(host)) {
935 mmc_power_up(host, host->card->ocr);
936 /*
937 * Tell runtime PM core we just powered up the card,
938 * since it still believes the card is powered off.
939 * Note that currently runtime PM is only enabled
940 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
941 */
942 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
943 pm_runtime_disable(&host->card->dev);
944 pm_runtime_set_active(&host->card->dev);
945 pm_runtime_enable(&host->card->dev);
946 }
947 }
948
949 /* No need to reinitialize powered-resumed nonremovable cards */
950 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
951 sdio_reset(host);
952 mmc_go_idle(host);
953 mmc_send_if_cond(host, host->card->ocr);
954 err = mmc_send_io_op_cond(host, 0, NULL);
955 if (!err)
956 err = mmc_sdio_init_card(host, host->card->ocr,
957 host->card,
958 mmc_card_keep_power(host));
959 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
960 /* We may have switched to 1-bit mode during suspend */
961 err = sdio_enable_4bit_bus(host->card);
962 }
963
964 if (!err && host->sdio_irqs) {
965 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
966 wake_up_process(host->sdio_irq_thread);
967 else if (host->caps & MMC_CAP_SDIO_IRQ)
968 host->ops->enable_sdio_irq(host, 1);
969 }
970
971 mmc_release_host(host);
972
973 host->pm_flags &= ~MMC_PM_KEEP_POWER;
974 return err;
975}
976
977static int mmc_sdio_power_restore(struct mmc_host *host)
978{
979 int ret;
980
981 mmc_claim_host(host);
982
983 /*
984 * Reset the card by performing the same steps that are taken by
985 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
986 *
987 * sdio_reset() is technically not needed. Having just powered up the
988 * hardware, it should already be in reset state. However, some
989 * platforms (such as SD8686 on OLPC) do not instantly cut power,
990 * meaning that a reset is required when restoring power soon after
991 * powering off. It is harmless in other cases.
992 *
993 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
994 * is not necessary for non-removable cards. However, it is required
995 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
996 * harmless in other situations.
997 *
998 */
999
1000 sdio_reset(host);
1001 mmc_go_idle(host);
1002 mmc_send_if_cond(host, host->card->ocr);
1003
1004 ret = mmc_send_io_op_cond(host, 0, NULL);
1005 if (ret)
1006 goto out;
1007
1008 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1009 mmc_card_keep_power(host));
1010 if (!ret && host->sdio_irqs)
1011 mmc_signal_sdio_irq(host);
1012
1013out:
1014 mmc_release_host(host);
1015
1016 return ret;
1017}
1018
1019static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1020{
1021 /* No references to the card, cut the power to it. */
1022 mmc_claim_host(host);
1023 mmc_power_off(host);
1024 mmc_release_host(host);
1025
1026 return 0;
1027}
1028
1029static int mmc_sdio_runtime_resume(struct mmc_host *host)
1030{
1031 int ret;
1032
1033 /* Restore power and re-initialize. */
1034 mmc_claim_host(host);
1035 mmc_power_up(host, host->card->ocr);
1036 ret = mmc_sdio_power_restore(host);
1037 mmc_release_host(host);
1038
1039 return ret;
1040}
1041
1042static int mmc_sdio_reset(struct mmc_host *host)
1043{
1044 mmc_power_cycle(host, host->card->ocr);
1045 return mmc_sdio_power_restore(host);
1046}
1047
1048static const struct mmc_bus_ops mmc_sdio_ops = {
1049 .remove = mmc_sdio_remove,
1050 .detect = mmc_sdio_detect,
1051 .pre_suspend = mmc_sdio_pre_suspend,
1052 .suspend = mmc_sdio_suspend,
1053 .resume = mmc_sdio_resume,
1054 .runtime_suspend = mmc_sdio_runtime_suspend,
1055 .runtime_resume = mmc_sdio_runtime_resume,
1056 .power_restore = mmc_sdio_power_restore,
1057 .alive = mmc_sdio_alive,
1058 .reset = mmc_sdio_reset,
1059};
1060
1061
1062/*
1063 * Starting point for SDIO card init.
1064 */
1065int mmc_attach_sdio(struct mmc_host *host)
1066{
1067 int err, i, funcs;
1068 u32 ocr, rocr;
1069 struct mmc_card *card;
1070
1071 WARN_ON(!host->claimed);
1072
1073 err = mmc_send_io_op_cond(host, 0, &ocr);
1074 if (err)
1075 return err;
1076
1077 mmc_attach_bus(host, &mmc_sdio_ops);
1078 if (host->ocr_avail_sdio)
1079 host->ocr_avail = host->ocr_avail_sdio;
1080
1081
1082 rocr = mmc_select_voltage(host, ocr);
1083
1084 /*
1085 * Can we support the voltage(s) of the card(s)?
1086 */
1087 if (!rocr) {
1088 err = -EINVAL;
1089 goto err;
1090 }
1091
1092 /*
1093 * Detect and init the card.
1094 */
1095 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1096 if (err)
1097 goto err;
1098
1099 card = host->card;
1100
1101 /*
1102 * Enable runtime PM only if supported by host+card+board
1103 */
1104 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1105 /*
1106 * Do not allow runtime suspend until after SDIO function
1107 * devices are added.
1108 */
1109 pm_runtime_get_noresume(&card->dev);
1110
1111 /*
1112 * Let runtime PM core know our card is active
1113 */
1114 err = pm_runtime_set_active(&card->dev);
1115 if (err)
1116 goto remove;
1117
1118 /*
1119 * Enable runtime PM for this card
1120 */
1121 pm_runtime_enable(&card->dev);
1122 }
1123
1124 /*
1125 * The number of functions on the card is encoded inside
1126 * the ocr.
1127 */
1128 funcs = (ocr & 0x70000000) >> 28;
1129 card->sdio_funcs = 0;
1130
1131 /*
1132 * Initialize (but don't add) all present functions.
1133 */
1134 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1135 err = sdio_init_func(host->card, i + 1);
1136 if (err)
1137 goto remove;
1138
1139 /*
1140 * Enable Runtime PM for this func (if supported)
1141 */
1142 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1143 pm_runtime_enable(&card->sdio_func[i]->dev);
1144 }
1145
1146 /*
1147 * First add the card to the driver model...
1148 */
1149 mmc_release_host(host);
1150 err = mmc_add_card(host->card);
1151 if (err)
1152 goto remove_added;
1153
1154 /*
1155 * ...then the SDIO functions.
1156 */
1157 for (i = 0;i < funcs;i++) {
1158 err = sdio_add_func(host->card->sdio_func[i]);
1159 if (err)
1160 goto remove_added;
1161 }
1162
1163 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1164 pm_runtime_put(&card->dev);
1165
1166 mmc_claim_host(host);
1167 return 0;
1168
1169
1170remove:
1171 mmc_release_host(host);
1172remove_added:
1173 /*
1174 * The devices are being deleted so it is not necessary to disable
1175 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1176 * because it needs to be active to remove any function devices that
1177 * were probed, and after that it gets deleted.
1178 */
1179 mmc_sdio_remove(host);
1180 mmc_claim_host(host);
1181err:
1182 mmc_detach_bus(host);
1183
1184 pr_err("%s: error %d whilst initialising SDIO card\n",
1185 mmc_hostname(host), err);
1186
1187 return err;
1188}
1189