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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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/mmc/sdio.c
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8#include <linux/err.h>
9#include <linux/pm_runtime.h>
10
11#include <linux/mmc/host.h>
12#include <linux/mmc/card.h>
13#include <linux/mmc/mmc.h>
14#include <linux/mmc/sdio.h>
15#include <linux/mmc/sdio_func.h>
16#include <linux/mmc/sdio_ids.h>
17
18#include "core.h"
19#include "card.h"
20#include "host.h"
21#include "bus.h"
22#include "quirks.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
30MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
31MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
32MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
33MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
34
35static struct attribute *sdio_std_attrs[] = {
36 &dev_attr_vendor.attr,
37 &dev_attr_device.attr,
38 &dev_attr_ocr.attr,
39 &dev_attr_rca.attr,
40 NULL,
41};
42ATTRIBUTE_GROUPS(sdio_std);
43
44static struct device_type sdio_type = {
45 .groups = sdio_std_groups,
46};
47
48static int sdio_read_fbr(struct sdio_func *func)
49{
50 int ret;
51 unsigned char data;
52
53 if (mmc_card_nonstd_func_interface(func->card)) {
54 func->class = SDIO_CLASS_NONE;
55 return 0;
56 }
57
58 ret = mmc_io_rw_direct(func->card, 0, 0,
59 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
60 if (ret)
61 goto out;
62
63 data &= 0x0f;
64
65 if (data == 0x0f) {
66 ret = mmc_io_rw_direct(func->card, 0, 0,
67 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
68 if (ret)
69 goto out;
70 }
71
72 func->class = data;
73
74out:
75 return ret;
76}
77
78static int sdio_init_func(struct mmc_card *card, unsigned int fn)
79{
80 int ret;
81 struct sdio_func *func;
82
83 if (WARN_ON(fn > SDIO_MAX_FUNCS))
84 return -EINVAL;
85
86 func = sdio_alloc_func(card);
87 if (IS_ERR(func))
88 return PTR_ERR(func);
89
90 func->num = fn;
91
92 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
93 ret = sdio_read_fbr(func);
94 if (ret)
95 goto fail;
96
97 ret = sdio_read_func_cis(func);
98 if (ret)
99 goto fail;
100 } else {
101 func->vendor = func->card->cis.vendor;
102 func->device = func->card->cis.device;
103 func->max_blksize = func->card->cis.blksize;
104 }
105
106 card->sdio_func[fn - 1] = func;
107
108 return 0;
109
110fail:
111 /*
112 * It is okay to remove the function here even though we hold
113 * the host lock as we haven't registered the device yet.
114 */
115 sdio_remove_func(func);
116 return ret;
117}
118
119static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
120{
121 int ret;
122 int cccr_vsn;
123 int uhs = ocr & R4_18V_PRESENT;
124 unsigned char data;
125 unsigned char speed;
126
127 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
128 if (ret)
129 goto out;
130
131 cccr_vsn = data & 0x0f;
132
133 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
134 pr_err("%s: unrecognised CCCR structure version %d\n",
135 mmc_hostname(card->host), cccr_vsn);
136 return -EINVAL;
137 }
138
139 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
140
141 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
142 if (ret)
143 goto out;
144
145 if (data & SDIO_CCCR_CAP_SMB)
146 card->cccr.multi_block = 1;
147 if (data & SDIO_CCCR_CAP_LSC)
148 card->cccr.low_speed = 1;
149 if (data & SDIO_CCCR_CAP_4BLS)
150 card->cccr.wide_bus = 1;
151
152 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
153 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
154 if (ret)
155 goto out;
156
157 if (data & SDIO_POWER_SMPC)
158 card->cccr.high_power = 1;
159 }
160
161 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
162 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
163 if (ret)
164 goto out;
165
166 card->scr.sda_spec3 = 0;
167 card->sw_caps.sd3_bus_mode = 0;
168 card->sw_caps.sd3_drv_type = 0;
169 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
170 card->scr.sda_spec3 = 1;
171 ret = mmc_io_rw_direct(card, 0, 0,
172 SDIO_CCCR_UHS, 0, &data);
173 if (ret)
174 goto out;
175
176 if (mmc_host_uhs(card->host)) {
177 if (data & SDIO_UHS_DDR50)
178 card->sw_caps.sd3_bus_mode
179 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
180 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
181
182 if (data & SDIO_UHS_SDR50)
183 card->sw_caps.sd3_bus_mode
184 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
185 | SD_MODE_UHS_SDR12;
186
187 if (data & SDIO_UHS_SDR104)
188 card->sw_caps.sd3_bus_mode
189 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
190 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
191 }
192
193 ret = mmc_io_rw_direct(card, 0, 0,
194 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
195 if (ret)
196 goto out;
197
198 if (data & SDIO_DRIVE_SDTA)
199 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
200 if (data & SDIO_DRIVE_SDTC)
201 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
202 if (data & SDIO_DRIVE_SDTD)
203 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
204 }
205
206 /* if no uhs mode ensure we check for high speed */
207 if (!card->sw_caps.sd3_bus_mode) {
208 if (speed & SDIO_SPEED_SHS) {
209 card->cccr.high_speed = 1;
210 card->sw_caps.hs_max_dtr = 50000000;
211 } else {
212 card->cccr.high_speed = 0;
213 card->sw_caps.hs_max_dtr = 25000000;
214 }
215 }
216 }
217
218out:
219 return ret;
220}
221
222static int sdio_enable_wide(struct mmc_card *card)
223{
224 int ret;
225 u8 ctrl;
226
227 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
228 return 0;
229
230 if (card->cccr.low_speed && !card->cccr.wide_bus)
231 return 0;
232
233 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
234 if (ret)
235 return ret;
236
237 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
238 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
239 mmc_hostname(card->host), ctrl);
240
241 /* set as 4-bit bus width */
242 ctrl &= ~SDIO_BUS_WIDTH_MASK;
243 ctrl |= SDIO_BUS_WIDTH_4BIT;
244
245 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
246 if (ret)
247 return ret;
248
249 return 1;
250}
251
252/*
253 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
254 * of the card. This may be required on certain setups of boards,
255 * controllers and embedded sdio device which do not need the card's
256 * pull-up. As a result, card detection is disabled and power is saved.
257 */
258static int sdio_disable_cd(struct mmc_card *card)
259{
260 int ret;
261 u8 ctrl;
262
263 if (!mmc_card_disable_cd(card))
264 return 0;
265
266 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
267 if (ret)
268 return ret;
269
270 ctrl |= SDIO_BUS_CD_DISABLE;
271
272 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
273}
274
275/*
276 * Devices that remain active during a system suspend are
277 * put back into 1-bit mode.
278 */
279static int sdio_disable_wide(struct mmc_card *card)
280{
281 int ret;
282 u8 ctrl;
283
284 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
285 return 0;
286
287 if (card->cccr.low_speed && !card->cccr.wide_bus)
288 return 0;
289
290 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
291 if (ret)
292 return ret;
293
294 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
295 return 0;
296
297 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
298 ctrl |= SDIO_BUS_ASYNC_INT;
299
300 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
301 if (ret)
302 return ret;
303
304 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
305
306 return 0;
307}
308
309static int sdio_disable_4bit_bus(struct mmc_card *card)
310{
311 int err;
312
313 if (card->type == MMC_TYPE_SDIO)
314 goto out;
315
316 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
317 return 0;
318
319 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
320 return 0;
321
322 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
323 if (err)
324 return err;
325
326out:
327 return sdio_disable_wide(card);
328}
329
330
331static int sdio_enable_4bit_bus(struct mmc_card *card)
332{
333 int err;
334
335 err = sdio_enable_wide(card);
336 if (err <= 0)
337 return err;
338 if (card->type == MMC_TYPE_SDIO)
339 goto out;
340
341 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
342 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
343 if (err) {
344 sdio_disable_wide(card);
345 return err;
346 }
347 }
348out:
349 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
350
351 return 0;
352}
353
354
355/*
356 * Test if the card supports high-speed mode and, if so, switch to it.
357 */
358static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
359{
360 int ret;
361 u8 speed;
362
363 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
364 return 0;
365
366 if (!card->cccr.high_speed)
367 return 0;
368
369 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
370 if (ret)
371 return ret;
372
373 if (enable)
374 speed |= SDIO_SPEED_EHS;
375 else
376 speed &= ~SDIO_SPEED_EHS;
377
378 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
379 if (ret)
380 return ret;
381
382 return 1;
383}
384
385/*
386 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
387 */
388static int sdio_enable_hs(struct mmc_card *card)
389{
390 int ret;
391
392 ret = mmc_sdio_switch_hs(card, true);
393 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
394 return ret;
395
396 ret = mmc_sd_switch_hs(card);
397 if (ret <= 0)
398 mmc_sdio_switch_hs(card, false);
399
400 return ret;
401}
402
403static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
404{
405 unsigned max_dtr;
406
407 if (mmc_card_hs(card)) {
408 /*
409 * The SDIO specification doesn't mention how
410 * the CIS transfer speed register relates to
411 * high-speed, but it seems that 50 MHz is
412 * mandatory.
413 */
414 max_dtr = 50000000;
415 } else {
416 max_dtr = card->cis.max_dtr;
417 }
418
419 if (card->type == MMC_TYPE_SD_COMBO)
420 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
421
422 return max_dtr;
423}
424
425static unsigned char host_drive_to_sdio_drive(int host_strength)
426{
427 switch (host_strength) {
428 case MMC_SET_DRIVER_TYPE_A:
429 return SDIO_DTSx_SET_TYPE_A;
430 case MMC_SET_DRIVER_TYPE_B:
431 return SDIO_DTSx_SET_TYPE_B;
432 case MMC_SET_DRIVER_TYPE_C:
433 return SDIO_DTSx_SET_TYPE_C;
434 case MMC_SET_DRIVER_TYPE_D:
435 return SDIO_DTSx_SET_TYPE_D;
436 default:
437 return SDIO_DTSx_SET_TYPE_B;
438 }
439}
440
441static void sdio_select_driver_type(struct mmc_card *card)
442{
443 int card_drv_type, drive_strength, drv_type;
444 unsigned char card_strength;
445 int err;
446
447 card->drive_strength = 0;
448
449 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
450
451 drive_strength = mmc_select_drive_strength(card,
452 card->sw_caps.uhs_max_dtr,
453 card_drv_type, &drv_type);
454
455 if (drive_strength) {
456 /* if error just use default for drive strength B */
457 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
458 &card_strength);
459 if (err)
460 return;
461
462 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
463 card_strength |= host_drive_to_sdio_drive(drive_strength);
464
465 /* if error default to drive strength B */
466 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
467 card_strength, NULL);
468 if (err)
469 return;
470 card->drive_strength = drive_strength;
471 }
472
473 if (drv_type)
474 mmc_set_driver_type(card->host, drv_type);
475}
476
477
478static int sdio_set_bus_speed_mode(struct mmc_card *card)
479{
480 unsigned int bus_speed, timing;
481 int err;
482 unsigned char speed;
483 unsigned int max_rate;
484
485 /*
486 * If the host doesn't support any of the UHS-I modes, fallback on
487 * default speed.
488 */
489 if (!mmc_host_uhs(card->host))
490 return 0;
491
492 bus_speed = SDIO_SPEED_SDR12;
493 timing = MMC_TIMING_UHS_SDR12;
494 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
495 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
496 bus_speed = SDIO_SPEED_SDR104;
497 timing = MMC_TIMING_UHS_SDR104;
498 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
499 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
500 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
501 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
502 bus_speed = SDIO_SPEED_DDR50;
503 timing = MMC_TIMING_UHS_DDR50;
504 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
505 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
506 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
507 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
508 SD_MODE_UHS_SDR50)) {
509 bus_speed = SDIO_SPEED_SDR50;
510 timing = MMC_TIMING_UHS_SDR50;
511 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
512 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
513 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
514 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
515 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
516 bus_speed = SDIO_SPEED_SDR25;
517 timing = MMC_TIMING_UHS_SDR25;
518 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
519 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
520 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
521 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
522 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
523 SD_MODE_UHS_SDR12)) {
524 bus_speed = SDIO_SPEED_SDR12;
525 timing = MMC_TIMING_UHS_SDR12;
526 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
527 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
528 }
529
530 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
531 if (err)
532 return err;
533
534 speed &= ~SDIO_SPEED_BSS_MASK;
535 speed |= bus_speed;
536 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
537 if (err)
538 return err;
539
540 max_rate = min_not_zero(card->quirk_max_rate,
541 card->sw_caps.uhs_max_dtr);
542
543 mmc_set_timing(card->host, timing);
544 mmc_set_clock(card->host, max_rate);
545
546 return 0;
547}
548
549/*
550 * UHS-I specific initialization procedure
551 */
552static int mmc_sdio_init_uhs_card(struct mmc_card *card)
553{
554 int err;
555
556 if (!card->scr.sda_spec3)
557 return 0;
558
559 /* Switch to wider bus */
560 err = sdio_enable_4bit_bus(card);
561 if (err)
562 goto out;
563
564 /* Set the driver strength for the card */
565 sdio_select_driver_type(card);
566
567 /* Set bus speed mode of the card */
568 err = sdio_set_bus_speed_mode(card);
569 if (err)
570 goto out;
571
572 /*
573 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
574 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
575 */
576 if (!mmc_host_is_spi(card->host) &&
577 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
578 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
579 err = mmc_execute_tuning(card);
580out:
581 return err;
582}
583
584static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
585 struct mmc_card *card)
586{
587 if (card)
588 mmc_remove_card(card);
589
590 /*
591 * Reset the card by performing the same steps that are taken by
592 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
593 *
594 * sdio_reset() is technically not needed. Having just powered up the
595 * hardware, it should already be in reset state. However, some
596 * platforms (such as SD8686 on OLPC) do not instantly cut power,
597 * meaning that a reset is required when restoring power soon after
598 * powering off. It is harmless in other cases.
599 *
600 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
601 * is not necessary for non-removable cards. However, it is required
602 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
603 * harmless in other situations.
604 *
605 */
606
607 sdio_reset(host);
608 mmc_go_idle(host);
609 mmc_send_if_cond(host, ocr);
610 return mmc_send_io_op_cond(host, 0, NULL);
611}
612
613/*
614 * Handle the detection and initialisation of a card.
615 *
616 * In the case of a resume, "oldcard" will contain the card
617 * we're trying to reinitialise.
618 */
619static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
620 struct mmc_card *oldcard)
621{
622 struct mmc_card *card;
623 int err;
624 int retries = 10;
625 u32 rocr = 0;
626 u32 ocr_card = ocr;
627
628 WARN_ON(!host->claimed);
629
630 /* to query card if 1.8V signalling is supported */
631 if (mmc_host_uhs(host))
632 ocr |= R4_18V_PRESENT;
633
634try_again:
635 if (!retries) {
636 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
637 ocr &= ~R4_18V_PRESENT;
638 }
639
640 /*
641 * Inform the card of the voltage
642 */
643 err = mmc_send_io_op_cond(host, ocr, &rocr);
644 if (err)
645 return err;
646
647 /*
648 * For SPI, enable CRC as appropriate.
649 */
650 if (mmc_host_is_spi(host)) {
651 err = mmc_spi_set_crc(host, use_spi_crc);
652 if (err)
653 return err;
654 }
655
656 /*
657 * Allocate card structure.
658 */
659 card = mmc_alloc_card(host, &sdio_type);
660 if (IS_ERR(card))
661 return PTR_ERR(card);
662
663 if ((rocr & R4_MEMORY_PRESENT) &&
664 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
665 card->type = MMC_TYPE_SD_COMBO;
666
667 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
668 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
669 err = -ENOENT;
670 goto mismatch;
671 }
672 } else {
673 card->type = MMC_TYPE_SDIO;
674
675 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
676 err = -ENOENT;
677 goto mismatch;
678 }
679 }
680
681 /*
682 * Call the optional HC's init_card function to handle quirks.
683 */
684 if (host->ops->init_card)
685 host->ops->init_card(host, card);
686
687 /*
688 * If the host and card support UHS-I mode request the card
689 * to switch to 1.8V signaling level. No 1.8v signalling if
690 * UHS mode is not enabled to maintain compatibility and some
691 * systems that claim 1.8v signalling in fact do not support
692 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
693 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
694 * fails to check rocr & R4_18V_PRESENT, but we still need to
695 * try to init uhs card. sdio_read_cccr will take over this task
696 * to make sure which speed mode should work.
697 */
698 if (rocr & ocr & R4_18V_PRESENT) {
699 err = mmc_set_uhs_voltage(host, ocr_card);
700 if (err == -EAGAIN) {
701 mmc_sdio_pre_init(host, ocr_card, card);
702 retries--;
703 goto try_again;
704 } else if (err) {
705 ocr &= ~R4_18V_PRESENT;
706 }
707 }
708
709 /*
710 * For native busses: set card RCA and quit open drain mode.
711 */
712 if (!mmc_host_is_spi(host)) {
713 err = mmc_send_relative_addr(host, &card->rca);
714 if (err)
715 goto remove;
716
717 /*
718 * Update oldcard with the new RCA received from the SDIO
719 * device -- we're doing this so that it's updated in the
720 * "card" struct when oldcard overwrites that later.
721 */
722 if (oldcard)
723 oldcard->rca = card->rca;
724 }
725
726 /*
727 * Read CSD, before selecting the card
728 */
729 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
730 err = mmc_sd_get_csd(host, card);
731 if (err)
732 goto remove;
733
734 mmc_decode_cid(card);
735 }
736
737 /*
738 * Select card, as all following commands rely on that.
739 */
740 if (!mmc_host_is_spi(host)) {
741 err = mmc_select_card(card);
742 if (err)
743 goto remove;
744 }
745
746 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
747 /*
748 * This is non-standard SDIO device, meaning it doesn't
749 * have any CIA (Common I/O area) registers present.
750 * It's host's responsibility to fill cccr and cis
751 * structures in init_card().
752 */
753 mmc_set_clock(host, card->cis.max_dtr);
754
755 if (card->cccr.high_speed) {
756 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
757 }
758
759 if (oldcard)
760 mmc_remove_card(card);
761 else
762 host->card = card;
763
764 return 0;
765 }
766
767 /*
768 * Read the common registers. Note that we should try to
769 * validate whether UHS would work or not.
770 */
771 err = sdio_read_cccr(card, ocr);
772 if (err) {
773 mmc_sdio_pre_init(host, ocr_card, card);
774 if (ocr & R4_18V_PRESENT) {
775 /* Retry init sequence, but without R4_18V_PRESENT. */
776 retries = 0;
777 goto try_again;
778 }
779 return err;
780 }
781
782 /*
783 * Read the common CIS tuples.
784 */
785 err = sdio_read_common_cis(card);
786 if (err)
787 goto remove;
788
789 if (oldcard) {
790 if (card->cis.vendor == oldcard->cis.vendor &&
791 card->cis.device == oldcard->cis.device) {
792 mmc_remove_card(card);
793 card = oldcard;
794 } else {
795 err = -ENOENT;
796 goto mismatch;
797 }
798 }
799 card->ocr = ocr_card;
800 mmc_fixup_device(card, sdio_fixup_methods);
801
802 if (card->type == MMC_TYPE_SD_COMBO) {
803 err = mmc_sd_setup_card(host, card, oldcard != NULL);
804 /* handle as SDIO-only card if memory init failed */
805 if (err) {
806 mmc_go_idle(host);
807 if (mmc_host_is_spi(host))
808 /* should not fail, as it worked previously */
809 mmc_spi_set_crc(host, use_spi_crc);
810 card->type = MMC_TYPE_SDIO;
811 } else
812 card->dev.type = &sd_type;
813 }
814
815 /*
816 * If needed, disconnect card detection pull-up resistor.
817 */
818 err = sdio_disable_cd(card);
819 if (err)
820 goto remove;
821
822 /* Initialization sequence for UHS-I cards */
823 /* Only if card supports 1.8v and UHS signaling */
824 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
825 err = mmc_sdio_init_uhs_card(card);
826 if (err)
827 goto remove;
828 } else {
829 /*
830 * Switch to high-speed (if supported).
831 */
832 err = sdio_enable_hs(card);
833 if (err > 0)
834 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
835 else if (err)
836 goto remove;
837
838 /*
839 * Change to the card's maximum speed.
840 */
841 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
842
843 /*
844 * Switch to wider bus (if supported).
845 */
846 err = sdio_enable_4bit_bus(card);
847 if (err)
848 goto remove;
849 }
850
851 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
852 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
853 pr_err("%s: Host failed to negotiate down from 3.3V\n",
854 mmc_hostname(host));
855 err = -EINVAL;
856 goto remove;
857 }
858
859 host->card = card;
860 return 0;
861
862mismatch:
863 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
864remove:
865 if (oldcard != card)
866 mmc_remove_card(card);
867 return err;
868}
869
870static int mmc_sdio_reinit_card(struct mmc_host *host)
871{
872 int ret;
873
874 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
875 if (ret)
876 return ret;
877
878 return mmc_sdio_init_card(host, host->card->ocr, host->card);
879}
880
881/*
882 * Host is being removed. Free up the current card.
883 */
884static void mmc_sdio_remove(struct mmc_host *host)
885{
886 int i;
887
888 for (i = 0;i < host->card->sdio_funcs;i++) {
889 if (host->card->sdio_func[i]) {
890 sdio_remove_func(host->card->sdio_func[i]);
891 host->card->sdio_func[i] = NULL;
892 }
893 }
894
895 mmc_remove_card(host->card);
896 host->card = NULL;
897}
898
899/*
900 * Card detection - card is alive.
901 */
902static int mmc_sdio_alive(struct mmc_host *host)
903{
904 return mmc_select_card(host->card);
905}
906
907/*
908 * Card detection callback from host.
909 */
910static void mmc_sdio_detect(struct mmc_host *host)
911{
912 int err;
913
914 /* Make sure card is powered before detecting it */
915 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
916 err = pm_runtime_get_sync(&host->card->dev);
917 if (err < 0) {
918 pm_runtime_put_noidle(&host->card->dev);
919 goto out;
920 }
921 }
922
923 mmc_claim_host(host);
924
925 /*
926 * Just check if our card has been removed.
927 */
928 err = _mmc_detect_card_removed(host);
929
930 mmc_release_host(host);
931
932 /*
933 * Tell PM core it's OK to power off the card now.
934 *
935 * The _sync variant is used in order to ensure that the card
936 * is left powered off in case an error occurred, and the card
937 * is going to be removed.
938 *
939 * Since there is no specific reason to believe a new user
940 * is about to show up at this point, the _sync variant is
941 * desirable anyway.
942 */
943 if (host->caps & MMC_CAP_POWER_OFF_CARD)
944 pm_runtime_put_sync(&host->card->dev);
945
946out:
947 if (err) {
948 mmc_sdio_remove(host);
949
950 mmc_claim_host(host);
951 mmc_detach_bus(host);
952 mmc_power_off(host);
953 mmc_release_host(host);
954 }
955}
956
957/*
958 * SDIO pre_suspend. We need to suspend all functions separately.
959 * Therefore all registered functions must have drivers with suspend
960 * and resume methods. Failing that we simply remove the whole card.
961 */
962static int mmc_sdio_pre_suspend(struct mmc_host *host)
963{
964 int i, err = 0;
965
966 for (i = 0; i < host->card->sdio_funcs; i++) {
967 struct sdio_func *func = host->card->sdio_func[i];
968 if (func && sdio_func_present(func) && func->dev.driver) {
969 const struct dev_pm_ops *pmops = func->dev.driver->pm;
970 if (!pmops || !pmops->suspend || !pmops->resume) {
971 /* force removal of entire card in that case */
972 err = -ENOSYS;
973 break;
974 }
975 }
976 }
977
978 return err;
979}
980
981/*
982 * SDIO suspend. Suspend all functions separately.
983 */
984static int mmc_sdio_suspend(struct mmc_host *host)
985{
986 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
987
988 /* Prevent processing of SDIO IRQs in suspended state. */
989 mmc_card_set_suspended(host->card);
990 cancel_delayed_work_sync(&host->sdio_irq_work);
991
992 mmc_claim_host(host);
993
994 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
995 sdio_disable_4bit_bus(host->card);
996
997 if (!mmc_card_keep_power(host)) {
998 mmc_power_off(host);
999 } else if (host->retune_period) {
1000 mmc_retune_timer_stop(host);
1001 mmc_retune_needed(host);
1002 }
1003
1004 mmc_release_host(host);
1005
1006 return 0;
1007}
1008
1009static int mmc_sdio_resume(struct mmc_host *host)
1010{
1011 int err = 0;
1012
1013 /* Basic card reinitialization. */
1014 mmc_claim_host(host);
1015
1016 /*
1017 * Restore power and reinitialize the card when needed. Note that a
1018 * removable card is checked from a detect work later on in the resume
1019 * process.
1020 */
1021 if (!mmc_card_keep_power(host)) {
1022 mmc_power_up(host, host->card->ocr);
1023 /*
1024 * Tell runtime PM core we just powered up the card,
1025 * since it still believes the card is powered off.
1026 * Note that currently runtime PM is only enabled
1027 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1028 */
1029 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1030 pm_runtime_disable(&host->card->dev);
1031 pm_runtime_set_active(&host->card->dev);
1032 pm_runtime_enable(&host->card->dev);
1033 }
1034 err = mmc_sdio_reinit_card(host);
1035 } else if (mmc_card_wake_sdio_irq(host)) {
1036 /* We may have switched to 1-bit mode during suspend */
1037 err = sdio_enable_4bit_bus(host->card);
1038 }
1039
1040 if (err)
1041 goto out;
1042
1043 /* Allow SDIO IRQs to be processed again. */
1044 mmc_card_clr_suspended(host->card);
1045
1046 if (host->sdio_irqs) {
1047 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1048 wake_up_process(host->sdio_irq_thread);
1049 else if (host->caps & MMC_CAP_SDIO_IRQ)
1050 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1051 }
1052
1053out:
1054 mmc_release_host(host);
1055
1056 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1057 return err;
1058}
1059
1060static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1061{
1062 /* No references to the card, cut the power to it. */
1063 mmc_claim_host(host);
1064 mmc_power_off(host);
1065 mmc_release_host(host);
1066
1067 return 0;
1068}
1069
1070static int mmc_sdio_runtime_resume(struct mmc_host *host)
1071{
1072 int ret;
1073
1074 /* Restore power and re-initialize. */
1075 mmc_claim_host(host);
1076 mmc_power_up(host, host->card->ocr);
1077 ret = mmc_sdio_reinit_card(host);
1078 mmc_release_host(host);
1079
1080 return ret;
1081}
1082
1083/*
1084 * SDIO HW reset
1085 *
1086 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1087 * reset was asynchronously scheduled, else a negative error code.
1088 */
1089static int mmc_sdio_hw_reset(struct mmc_host *host)
1090{
1091 struct mmc_card *card = host->card;
1092
1093 /*
1094 * In case the card is shared among multiple func drivers, reset the
1095 * card through a rescan work. In this way it will be removed and
1096 * re-detected, thus all func drivers becomes informed about it.
1097 */
1098 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1099 if (mmc_card_removed(card))
1100 return 1;
1101 host->rescan_entered = 0;
1102 mmc_card_set_removed(card);
1103 _mmc_detect_change(host, 0, false);
1104 return 1;
1105 }
1106
1107 /*
1108 * A single func driver has been probed, then let's skip the heavy
1109 * hotplug dance above and execute the reset immediately.
1110 */
1111 mmc_power_cycle(host, card->ocr);
1112 return mmc_sdio_reinit_card(host);
1113}
1114
1115static int mmc_sdio_sw_reset(struct mmc_host *host)
1116{
1117 mmc_set_clock(host, host->f_init);
1118 sdio_reset(host);
1119 mmc_go_idle(host);
1120
1121 mmc_set_initial_state(host);
1122 mmc_set_initial_signal_voltage(host);
1123
1124 return mmc_sdio_reinit_card(host);
1125}
1126
1127static const struct mmc_bus_ops mmc_sdio_ops = {
1128 .remove = mmc_sdio_remove,
1129 .detect = mmc_sdio_detect,
1130 .pre_suspend = mmc_sdio_pre_suspend,
1131 .suspend = mmc_sdio_suspend,
1132 .resume = mmc_sdio_resume,
1133 .runtime_suspend = mmc_sdio_runtime_suspend,
1134 .runtime_resume = mmc_sdio_runtime_resume,
1135 .alive = mmc_sdio_alive,
1136 .hw_reset = mmc_sdio_hw_reset,
1137 .sw_reset = mmc_sdio_sw_reset,
1138};
1139
1140
1141/*
1142 * Starting point for SDIO card init.
1143 */
1144int mmc_attach_sdio(struct mmc_host *host)
1145{
1146 int err, i, funcs;
1147 u32 ocr, rocr;
1148 struct mmc_card *card;
1149
1150 WARN_ON(!host->claimed);
1151
1152 err = mmc_send_io_op_cond(host, 0, &ocr);
1153 if (err)
1154 return err;
1155
1156 mmc_attach_bus(host, &mmc_sdio_ops);
1157 if (host->ocr_avail_sdio)
1158 host->ocr_avail = host->ocr_avail_sdio;
1159
1160
1161 rocr = mmc_select_voltage(host, ocr);
1162
1163 /*
1164 * Can we support the voltage(s) of the card(s)?
1165 */
1166 if (!rocr) {
1167 err = -EINVAL;
1168 goto err;
1169 }
1170
1171 /*
1172 * Detect and init the card.
1173 */
1174 err = mmc_sdio_init_card(host, rocr, NULL);
1175 if (err)
1176 goto err;
1177
1178 card = host->card;
1179
1180 /*
1181 * Enable runtime PM only if supported by host+card+board
1182 */
1183 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1184 /*
1185 * Do not allow runtime suspend until after SDIO function
1186 * devices are added.
1187 */
1188 pm_runtime_get_noresume(&card->dev);
1189
1190 /*
1191 * Let runtime PM core know our card is active
1192 */
1193 err = pm_runtime_set_active(&card->dev);
1194 if (err)
1195 goto remove;
1196
1197 /*
1198 * Enable runtime PM for this card
1199 */
1200 pm_runtime_enable(&card->dev);
1201 }
1202
1203 /*
1204 * The number of functions on the card is encoded inside
1205 * the ocr.
1206 */
1207 funcs = (ocr & 0x70000000) >> 28;
1208 card->sdio_funcs = 0;
1209
1210 /*
1211 * Initialize (but don't add) all present functions.
1212 */
1213 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1214 err = sdio_init_func(host->card, i + 1);
1215 if (err)
1216 goto remove;
1217
1218 /*
1219 * Enable Runtime PM for this func (if supported)
1220 */
1221 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1222 pm_runtime_enable(&card->sdio_func[i]->dev);
1223 }
1224
1225 /*
1226 * First add the card to the driver model...
1227 */
1228 mmc_release_host(host);
1229 err = mmc_add_card(host->card);
1230 if (err)
1231 goto remove_added;
1232
1233 /*
1234 * ...then the SDIO functions.
1235 */
1236 for (i = 0;i < funcs;i++) {
1237 err = sdio_add_func(host->card->sdio_func[i]);
1238 if (err)
1239 goto remove_added;
1240 }
1241
1242 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1243 pm_runtime_put(&card->dev);
1244
1245 mmc_claim_host(host);
1246 return 0;
1247
1248
1249remove:
1250 mmc_release_host(host);
1251remove_added:
1252 /*
1253 * The devices are being deleted so it is not necessary to disable
1254 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1255 * because it needs to be active to remove any function devices that
1256 * were probed, and after that it gets deleted.
1257 */
1258 mmc_sdio_remove(host);
1259 mmc_claim_host(host);
1260err:
1261 mmc_detach_bus(host);
1262
1263 pr_err("%s: error %d whilst initialising SDIO card\n",
1264 mmc_hostname(host), err);
1265
1266 return err;
1267}
1268