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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(revision, "%u.%u\n", card->major_rev, card->minor_rev);
33MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
34MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
35
36#define sdio_info_attr(num) \
37static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38{ \
39 struct mmc_card *card = mmc_dev_to_card(dev); \
40 \
41 if (num > card->num_info) \
42 return -ENODATA; \
43 if (!card->info[num-1][0]) \
44 return 0; \
45 return sprintf(buf, "%s\n", card->info[num-1]); \
46} \
47static DEVICE_ATTR_RO(info##num)
48
49sdio_info_attr(1);
50sdio_info_attr(2);
51sdio_info_attr(3);
52sdio_info_attr(4);
53
54static struct attribute *sdio_std_attrs[] = {
55 &dev_attr_vendor.attr,
56 &dev_attr_device.attr,
57 &dev_attr_revision.attr,
58 &dev_attr_info1.attr,
59 &dev_attr_info2.attr,
60 &dev_attr_info3.attr,
61 &dev_attr_info4.attr,
62 &dev_attr_ocr.attr,
63 &dev_attr_rca.attr,
64 NULL,
65};
66ATTRIBUTE_GROUPS(sdio_std);
67
68static struct device_type sdio_type = {
69 .groups = sdio_std_groups,
70};
71
72static int sdio_read_fbr(struct sdio_func *func)
73{
74 int ret;
75 unsigned char data;
76
77 if (mmc_card_nonstd_func_interface(func->card)) {
78 func->class = SDIO_CLASS_NONE;
79 return 0;
80 }
81
82 ret = mmc_io_rw_direct(func->card, 0, 0,
83 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
84 if (ret)
85 goto out;
86
87 data &= 0x0f;
88
89 if (data == 0x0f) {
90 ret = mmc_io_rw_direct(func->card, 0, 0,
91 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
92 if (ret)
93 goto out;
94 }
95
96 func->class = data;
97
98out:
99 return ret;
100}
101
102static int sdio_init_func(struct mmc_card *card, unsigned int fn)
103{
104 int ret;
105 struct sdio_func *func;
106
107 if (WARN_ON(fn > SDIO_MAX_FUNCS))
108 return -EINVAL;
109
110 func = sdio_alloc_func(card);
111 if (IS_ERR(func))
112 return PTR_ERR(func);
113
114 func->num = fn;
115
116 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
117 ret = sdio_read_fbr(func);
118 if (ret)
119 goto fail;
120
121 ret = sdio_read_func_cis(func);
122 if (ret)
123 goto fail;
124 } else {
125 func->vendor = func->card->cis.vendor;
126 func->device = func->card->cis.device;
127 func->max_blksize = func->card->cis.blksize;
128 }
129
130 card->sdio_func[fn - 1] = func;
131
132 return 0;
133
134fail:
135 /*
136 * It is okay to remove the function here even though we hold
137 * the host lock as we haven't registered the device yet.
138 */
139 sdio_remove_func(func);
140 return ret;
141}
142
143static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
144{
145 int ret;
146 int cccr_vsn;
147 int uhs = ocr & R4_18V_PRESENT;
148 unsigned char data;
149 unsigned char speed;
150
151 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
152 if (ret)
153 goto out;
154
155 cccr_vsn = data & 0x0f;
156
157 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
158 pr_err("%s: unrecognised CCCR structure version %d\n",
159 mmc_hostname(card->host), cccr_vsn);
160 return -EINVAL;
161 }
162
163 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
164
165 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
166 if (ret)
167 goto out;
168
169 if (data & SDIO_CCCR_CAP_SMB)
170 card->cccr.multi_block = 1;
171 if (data & SDIO_CCCR_CAP_LSC)
172 card->cccr.low_speed = 1;
173 if (data & SDIO_CCCR_CAP_4BLS)
174 card->cccr.wide_bus = 1;
175
176 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
177 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
178 if (ret)
179 goto out;
180
181 if (data & SDIO_POWER_SMPC)
182 card->cccr.high_power = 1;
183 }
184
185 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
186 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
187 if (ret)
188 goto out;
189
190 card->scr.sda_spec3 = 0;
191 card->sw_caps.sd3_bus_mode = 0;
192 card->sw_caps.sd3_drv_type = 0;
193 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
194 card->scr.sda_spec3 = 1;
195 ret = mmc_io_rw_direct(card, 0, 0,
196 SDIO_CCCR_UHS, 0, &data);
197 if (ret)
198 goto out;
199
200 if (mmc_host_uhs(card->host)) {
201 if (data & SDIO_UHS_DDR50)
202 card->sw_caps.sd3_bus_mode
203 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
204 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
205
206 if (data & SDIO_UHS_SDR50)
207 card->sw_caps.sd3_bus_mode
208 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
209 | SD_MODE_UHS_SDR12;
210
211 if (data & SDIO_UHS_SDR104)
212 card->sw_caps.sd3_bus_mode
213 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
214 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
215 }
216
217 ret = mmc_io_rw_direct(card, 0, 0,
218 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
219 if (ret)
220 goto out;
221
222 if (data & SDIO_DRIVE_SDTA)
223 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
224 if (data & SDIO_DRIVE_SDTC)
225 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
226 if (data & SDIO_DRIVE_SDTD)
227 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
228 }
229
230 /* if no uhs mode ensure we check for high speed */
231 if (!card->sw_caps.sd3_bus_mode) {
232 if (speed & SDIO_SPEED_SHS) {
233 card->cccr.high_speed = 1;
234 card->sw_caps.hs_max_dtr = 50000000;
235 } else {
236 card->cccr.high_speed = 0;
237 card->sw_caps.hs_max_dtr = 25000000;
238 }
239 }
240 }
241
242out:
243 return ret;
244}
245
246static int sdio_enable_wide(struct mmc_card *card)
247{
248 int ret;
249 u8 ctrl;
250
251 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
252 return 0;
253
254 if (card->cccr.low_speed && !card->cccr.wide_bus)
255 return 0;
256
257 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
258 if (ret)
259 return ret;
260
261 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
262 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
263 mmc_hostname(card->host), ctrl);
264
265 /* set as 4-bit bus width */
266 ctrl &= ~SDIO_BUS_WIDTH_MASK;
267 ctrl |= SDIO_BUS_WIDTH_4BIT;
268
269 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
270 if (ret)
271 return ret;
272
273 return 1;
274}
275
276/*
277 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
278 * of the card. This may be required on certain setups of boards,
279 * controllers and embedded sdio device which do not need the card's
280 * pull-up. As a result, card detection is disabled and power is saved.
281 */
282static int sdio_disable_cd(struct mmc_card *card)
283{
284 int ret;
285 u8 ctrl;
286
287 if (!mmc_card_disable_cd(card))
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 ctrl |= SDIO_BUS_CD_DISABLE;
295
296 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
297}
298
299/*
300 * Devices that remain active during a system suspend are
301 * put back into 1-bit mode.
302 */
303static int sdio_disable_wide(struct mmc_card *card)
304{
305 int ret;
306 u8 ctrl;
307
308 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
309 return 0;
310
311 if (card->cccr.low_speed && !card->cccr.wide_bus)
312 return 0;
313
314 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
315 if (ret)
316 return ret;
317
318 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
319 return 0;
320
321 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
322 ctrl |= SDIO_BUS_ASYNC_INT;
323
324 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
325 if (ret)
326 return ret;
327
328 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
329
330 return 0;
331}
332
333static int sdio_disable_4bit_bus(struct mmc_card *card)
334{
335 int err;
336
337 if (card->type == MMC_TYPE_SDIO)
338 goto out;
339
340 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
341 return 0;
342
343 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
344 return 0;
345
346 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
347 if (err)
348 return err;
349
350out:
351 return sdio_disable_wide(card);
352}
353
354
355static int sdio_enable_4bit_bus(struct mmc_card *card)
356{
357 int err;
358
359 err = sdio_enable_wide(card);
360 if (err <= 0)
361 return err;
362 if (card->type == MMC_TYPE_SDIO)
363 goto out;
364
365 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
366 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
367 if (err) {
368 sdio_disable_wide(card);
369 return err;
370 }
371 }
372out:
373 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
374
375 return 0;
376}
377
378
379/*
380 * Test if the card supports high-speed mode and, if so, switch to it.
381 */
382static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
383{
384 int ret;
385 u8 speed;
386
387 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
388 return 0;
389
390 if (!card->cccr.high_speed)
391 return 0;
392
393 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
394 if (ret)
395 return ret;
396
397 if (enable)
398 speed |= SDIO_SPEED_EHS;
399 else
400 speed &= ~SDIO_SPEED_EHS;
401
402 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
403 if (ret)
404 return ret;
405
406 return 1;
407}
408
409/*
410 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
411 */
412static int sdio_enable_hs(struct mmc_card *card)
413{
414 int ret;
415
416 ret = mmc_sdio_switch_hs(card, true);
417 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
418 return ret;
419
420 ret = mmc_sd_switch_hs(card);
421 if (ret <= 0)
422 mmc_sdio_switch_hs(card, false);
423
424 return ret;
425}
426
427static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
428{
429 unsigned max_dtr;
430
431 if (mmc_card_hs(card)) {
432 /*
433 * The SDIO specification doesn't mention how
434 * the CIS transfer speed register relates to
435 * high-speed, but it seems that 50 MHz is
436 * mandatory.
437 */
438 max_dtr = 50000000;
439 } else {
440 max_dtr = card->cis.max_dtr;
441 }
442
443 if (card->type == MMC_TYPE_SD_COMBO)
444 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
445
446 return max_dtr;
447}
448
449static unsigned char host_drive_to_sdio_drive(int host_strength)
450{
451 switch (host_strength) {
452 case MMC_SET_DRIVER_TYPE_A:
453 return SDIO_DTSx_SET_TYPE_A;
454 case MMC_SET_DRIVER_TYPE_B:
455 return SDIO_DTSx_SET_TYPE_B;
456 case MMC_SET_DRIVER_TYPE_C:
457 return SDIO_DTSx_SET_TYPE_C;
458 case MMC_SET_DRIVER_TYPE_D:
459 return SDIO_DTSx_SET_TYPE_D;
460 default:
461 return SDIO_DTSx_SET_TYPE_B;
462 }
463}
464
465static void sdio_select_driver_type(struct mmc_card *card)
466{
467 int card_drv_type, drive_strength, drv_type;
468 unsigned char card_strength;
469 int err;
470
471 card->drive_strength = 0;
472
473 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
474
475 drive_strength = mmc_select_drive_strength(card,
476 card->sw_caps.uhs_max_dtr,
477 card_drv_type, &drv_type);
478
479 if (drive_strength) {
480 /* if error just use default for drive strength B */
481 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
482 &card_strength);
483 if (err)
484 return;
485
486 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
487 card_strength |= host_drive_to_sdio_drive(drive_strength);
488
489 /* if error default to drive strength B */
490 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
491 card_strength, NULL);
492 if (err)
493 return;
494 card->drive_strength = drive_strength;
495 }
496
497 if (drv_type)
498 mmc_set_driver_type(card->host, drv_type);
499}
500
501
502static int sdio_set_bus_speed_mode(struct mmc_card *card)
503{
504 unsigned int bus_speed, timing;
505 int err;
506 unsigned char speed;
507 unsigned int max_rate;
508
509 /*
510 * If the host doesn't support any of the UHS-I modes, fallback on
511 * default speed.
512 */
513 if (!mmc_host_uhs(card->host))
514 return 0;
515
516 bus_speed = SDIO_SPEED_SDR12;
517 timing = MMC_TIMING_UHS_SDR12;
518 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
519 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
520 bus_speed = SDIO_SPEED_SDR104;
521 timing = MMC_TIMING_UHS_SDR104;
522 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
523 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
524 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
525 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
526 bus_speed = SDIO_SPEED_DDR50;
527 timing = MMC_TIMING_UHS_DDR50;
528 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
529 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
530 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
531 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
532 SD_MODE_UHS_SDR50)) {
533 bus_speed = SDIO_SPEED_SDR50;
534 timing = MMC_TIMING_UHS_SDR50;
535 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
536 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
537 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
538 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
539 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
540 bus_speed = SDIO_SPEED_SDR25;
541 timing = MMC_TIMING_UHS_SDR25;
542 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
543 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
544 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
545 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
546 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
547 SD_MODE_UHS_SDR12)) {
548 bus_speed = SDIO_SPEED_SDR12;
549 timing = MMC_TIMING_UHS_SDR12;
550 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
551 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
552 }
553
554 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
555 if (err)
556 return err;
557
558 speed &= ~SDIO_SPEED_BSS_MASK;
559 speed |= bus_speed;
560 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
561 if (err)
562 return err;
563
564 max_rate = min_not_zero(card->quirk_max_rate,
565 card->sw_caps.uhs_max_dtr);
566
567 mmc_set_timing(card->host, timing);
568 mmc_set_clock(card->host, max_rate);
569
570 return 0;
571}
572
573/*
574 * UHS-I specific initialization procedure
575 */
576static int mmc_sdio_init_uhs_card(struct mmc_card *card)
577{
578 int err;
579
580 if (!card->scr.sda_spec3)
581 return 0;
582
583 /* Switch to wider bus */
584 err = sdio_enable_4bit_bus(card);
585 if (err)
586 goto out;
587
588 /* Set the driver strength for the card */
589 sdio_select_driver_type(card);
590
591 /* Set bus speed mode of the card */
592 err = sdio_set_bus_speed_mode(card);
593 if (err)
594 goto out;
595
596 /*
597 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
598 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
599 */
600 if (!mmc_host_is_spi(card->host) &&
601 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
602 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
603 err = mmc_execute_tuning(card);
604out:
605 return err;
606}
607
608static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
609 struct mmc_card *card)
610{
611 if (card)
612 mmc_remove_card(card);
613
614 /*
615 * Reset the card by performing the same steps that are taken by
616 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
617 *
618 * sdio_reset() is technically not needed. Having just powered up the
619 * hardware, it should already be in reset state. However, some
620 * platforms (such as SD8686 on OLPC) do not instantly cut power,
621 * meaning that a reset is required when restoring power soon after
622 * powering off. It is harmless in other cases.
623 *
624 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
625 * is not necessary for non-removable cards. However, it is required
626 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
627 * harmless in other situations.
628 *
629 */
630
631 sdio_reset(host);
632 mmc_go_idle(host);
633 mmc_send_if_cond(host, ocr);
634 return mmc_send_io_op_cond(host, 0, NULL);
635}
636
637/*
638 * Handle the detection and initialisation of a card.
639 *
640 * In the case of a resume, "oldcard" will contain the card
641 * we're trying to reinitialise.
642 */
643static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
644 struct mmc_card *oldcard)
645{
646 struct mmc_card *card;
647 int err;
648 int retries = 10;
649 u32 rocr = 0;
650 u32 ocr_card = ocr;
651
652 WARN_ON(!host->claimed);
653
654 /* to query card if 1.8V signalling is supported */
655 if (mmc_host_uhs(host))
656 ocr |= R4_18V_PRESENT;
657
658try_again:
659 if (!retries) {
660 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
661 ocr &= ~R4_18V_PRESENT;
662 }
663
664 /*
665 * Inform the card of the voltage
666 */
667 err = mmc_send_io_op_cond(host, ocr, &rocr);
668 if (err)
669 return err;
670
671 /*
672 * For SPI, enable CRC as appropriate.
673 */
674 if (mmc_host_is_spi(host)) {
675 err = mmc_spi_set_crc(host, use_spi_crc);
676 if (err)
677 return err;
678 }
679
680 /*
681 * Allocate card structure.
682 */
683 card = mmc_alloc_card(host, &sdio_type);
684 if (IS_ERR(card))
685 return PTR_ERR(card);
686
687 if ((rocr & R4_MEMORY_PRESENT) &&
688 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
689 card->type = MMC_TYPE_SD_COMBO;
690
691 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
692 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
693 err = -ENOENT;
694 goto mismatch;
695 }
696 } else {
697 card->type = MMC_TYPE_SDIO;
698
699 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
700 err = -ENOENT;
701 goto mismatch;
702 }
703 }
704
705 /*
706 * Call the optional HC's init_card function to handle quirks.
707 */
708 if (host->ops->init_card)
709 host->ops->init_card(host, card);
710
711 /*
712 * If the host and card support UHS-I mode request the card
713 * to switch to 1.8V signaling level. No 1.8v signalling if
714 * UHS mode is not enabled to maintain compatibility and some
715 * systems that claim 1.8v signalling in fact do not support
716 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
717 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
718 * fails to check rocr & R4_18V_PRESENT, but we still need to
719 * try to init uhs card. sdio_read_cccr will take over this task
720 * to make sure which speed mode should work.
721 */
722 if (rocr & ocr & R4_18V_PRESENT) {
723 err = mmc_set_uhs_voltage(host, ocr_card);
724 if (err == -EAGAIN) {
725 mmc_sdio_pre_init(host, ocr_card, card);
726 retries--;
727 goto try_again;
728 } else if (err) {
729 ocr &= ~R4_18V_PRESENT;
730 }
731 }
732
733 /*
734 * For native busses: set card RCA and quit open drain mode.
735 */
736 if (!mmc_host_is_spi(host)) {
737 err = mmc_send_relative_addr(host, &card->rca);
738 if (err)
739 goto remove;
740
741 /*
742 * Update oldcard with the new RCA received from the SDIO
743 * device -- we're doing this so that it's updated in the
744 * "card" struct when oldcard overwrites that later.
745 */
746 if (oldcard)
747 oldcard->rca = card->rca;
748 }
749
750 /*
751 * Read CSD, before selecting the card
752 */
753 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
754 err = mmc_sd_get_csd(card);
755 if (err)
756 goto remove;
757
758 mmc_decode_cid(card);
759 }
760
761 /*
762 * Select card, as all following commands rely on that.
763 */
764 if (!mmc_host_is_spi(host)) {
765 err = mmc_select_card(card);
766 if (err)
767 goto remove;
768 }
769
770 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
771 /*
772 * This is non-standard SDIO device, meaning it doesn't
773 * have any CIA (Common I/O area) registers present.
774 * It's host's responsibility to fill cccr and cis
775 * structures in init_card().
776 */
777 mmc_set_clock(host, card->cis.max_dtr);
778
779 if (card->cccr.high_speed) {
780 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
781 }
782
783 if (oldcard)
784 mmc_remove_card(card);
785 else
786 host->card = card;
787
788 return 0;
789 }
790
791 /*
792 * Read the common registers. Note that we should try to
793 * validate whether UHS would work or not.
794 */
795 err = sdio_read_cccr(card, ocr);
796 if (err) {
797 mmc_sdio_pre_init(host, ocr_card, card);
798 if (ocr & R4_18V_PRESENT) {
799 /* Retry init sequence, but without R4_18V_PRESENT. */
800 retries = 0;
801 goto try_again;
802 }
803 return err;
804 }
805
806 /*
807 * Read the common CIS tuples.
808 */
809 err = sdio_read_common_cis(card);
810 if (err)
811 goto remove;
812
813 if (oldcard) {
814 if (card->cis.vendor == oldcard->cis.vendor &&
815 card->cis.device == oldcard->cis.device) {
816 mmc_remove_card(card);
817 card = oldcard;
818 } else {
819 err = -ENOENT;
820 goto mismatch;
821 }
822 }
823 card->ocr = ocr_card;
824 mmc_fixup_device(card, sdio_fixup_methods);
825
826 if (card->type == MMC_TYPE_SD_COMBO) {
827 err = mmc_sd_setup_card(host, card, oldcard != NULL);
828 /* handle as SDIO-only card if memory init failed */
829 if (err) {
830 mmc_go_idle(host);
831 if (mmc_host_is_spi(host))
832 /* should not fail, as it worked previously */
833 mmc_spi_set_crc(host, use_spi_crc);
834 card->type = MMC_TYPE_SDIO;
835 } else
836 card->dev.type = &sd_type;
837 }
838
839 /*
840 * If needed, disconnect card detection pull-up resistor.
841 */
842 err = sdio_disable_cd(card);
843 if (err)
844 goto remove;
845
846 /* Initialization sequence for UHS-I cards */
847 /* Only if card supports 1.8v and UHS signaling */
848 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
849 err = mmc_sdio_init_uhs_card(card);
850 if (err)
851 goto remove;
852 } else {
853 /*
854 * Switch to high-speed (if supported).
855 */
856 err = sdio_enable_hs(card);
857 if (err > 0)
858 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
859 else if (err)
860 goto remove;
861
862 /*
863 * Change to the card's maximum speed.
864 */
865 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
866
867 /*
868 * Switch to wider bus (if supported).
869 */
870 err = sdio_enable_4bit_bus(card);
871 if (err)
872 goto remove;
873 }
874
875 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
876 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
877 pr_err("%s: Host failed to negotiate down from 3.3V\n",
878 mmc_hostname(host));
879 err = -EINVAL;
880 goto remove;
881 }
882
883 host->card = card;
884 return 0;
885
886mismatch:
887 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
888remove:
889 if (oldcard != card)
890 mmc_remove_card(card);
891 return err;
892}
893
894static int mmc_sdio_reinit_card(struct mmc_host *host)
895{
896 int ret;
897
898 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
899 if (ret)
900 return ret;
901
902 return mmc_sdio_init_card(host, host->card->ocr, host->card);
903}
904
905/*
906 * Host is being removed. Free up the current card.
907 */
908static void mmc_sdio_remove(struct mmc_host *host)
909{
910 int i;
911
912 for (i = 0;i < host->card->sdio_funcs;i++) {
913 if (host->card->sdio_func[i]) {
914 sdio_remove_func(host->card->sdio_func[i]);
915 host->card->sdio_func[i] = NULL;
916 }
917 }
918
919 mmc_remove_card(host->card);
920 host->card = NULL;
921}
922
923/*
924 * Card detection - card is alive.
925 */
926static int mmc_sdio_alive(struct mmc_host *host)
927{
928 return mmc_select_card(host->card);
929}
930
931/*
932 * Card detection callback from host.
933 */
934static void mmc_sdio_detect(struct mmc_host *host)
935{
936 int err;
937
938 /* Make sure card is powered before detecting it */
939 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
940 err = pm_runtime_resume_and_get(&host->card->dev);
941 if (err < 0)
942 goto out;
943 }
944
945 mmc_claim_host(host);
946
947 /*
948 * Just check if our card has been removed.
949 */
950 err = _mmc_detect_card_removed(host);
951
952 mmc_release_host(host);
953
954 /*
955 * Tell PM core it's OK to power off the card now.
956 *
957 * The _sync variant is used in order to ensure that the card
958 * is left powered off in case an error occurred, and the card
959 * is going to be removed.
960 *
961 * Since there is no specific reason to believe a new user
962 * is about to show up at this point, the _sync variant is
963 * desirable anyway.
964 */
965 if (host->caps & MMC_CAP_POWER_OFF_CARD)
966 pm_runtime_put_sync(&host->card->dev);
967
968out:
969 if (err) {
970 mmc_sdio_remove(host);
971
972 mmc_claim_host(host);
973 mmc_detach_bus(host);
974 mmc_power_off(host);
975 mmc_release_host(host);
976 }
977}
978
979/*
980 * SDIO pre_suspend. We need to suspend all functions separately.
981 * Therefore all registered functions must have drivers with suspend
982 * and resume methods. Failing that we simply remove the whole card.
983 */
984static int mmc_sdio_pre_suspend(struct mmc_host *host)
985{
986 int i;
987
988 for (i = 0; i < host->card->sdio_funcs; i++) {
989 struct sdio_func *func = host->card->sdio_func[i];
990 if (func && sdio_func_present(func) && func->dev.driver) {
991 const struct dev_pm_ops *pmops = func->dev.driver->pm;
992 if (!pmops || !pmops->suspend || !pmops->resume)
993 /* force removal of entire card in that case */
994 goto remove;
995 }
996 }
997
998 return 0;
999
1000remove:
1001 if (!mmc_card_is_removable(host)) {
1002 dev_warn(mmc_dev(host),
1003 "missing suspend/resume ops for non-removable SDIO card\n");
1004 /* Don't remove a non-removable card - we can't re-detect it. */
1005 return 0;
1006 }
1007
1008 /* Remove the SDIO card and let it be re-detected later on. */
1009 mmc_sdio_remove(host);
1010 mmc_claim_host(host);
1011 mmc_detach_bus(host);
1012 mmc_power_off(host);
1013 mmc_release_host(host);
1014 host->pm_flags = 0;
1015
1016 return 0;
1017}
1018
1019/*
1020 * SDIO suspend. Suspend all functions separately.
1021 */
1022static int mmc_sdio_suspend(struct mmc_host *host)
1023{
1024 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
1025
1026 /* Prevent processing of SDIO IRQs in suspended state. */
1027 mmc_card_set_suspended(host->card);
1028 cancel_delayed_work_sync(&host->sdio_irq_work);
1029
1030 mmc_claim_host(host);
1031
1032 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
1033 sdio_disable_4bit_bus(host->card);
1034
1035 if (!mmc_card_keep_power(host)) {
1036 mmc_power_off(host);
1037 } else if (host->retune_period) {
1038 mmc_retune_timer_stop(host);
1039 mmc_retune_needed(host);
1040 }
1041
1042 mmc_release_host(host);
1043
1044 return 0;
1045}
1046
1047static int mmc_sdio_resume(struct mmc_host *host)
1048{
1049 int err = 0;
1050
1051 /* Basic card reinitialization. */
1052 mmc_claim_host(host);
1053
1054 /*
1055 * Restore power and reinitialize the card when needed. Note that a
1056 * removable card is checked from a detect work later on in the resume
1057 * process.
1058 */
1059 if (!mmc_card_keep_power(host)) {
1060 mmc_power_up(host, host->card->ocr);
1061 /*
1062 * Tell runtime PM core we just powered up the card,
1063 * since it still believes the card is powered off.
1064 * Note that currently runtime PM is only enabled
1065 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1066 */
1067 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1068 pm_runtime_disable(&host->card->dev);
1069 pm_runtime_set_active(&host->card->dev);
1070 pm_runtime_enable(&host->card->dev);
1071 }
1072 err = mmc_sdio_reinit_card(host);
1073 } else if (mmc_card_wake_sdio_irq(host)) {
1074 /* We may have switched to 1-bit mode during suspend */
1075 err = sdio_enable_4bit_bus(host->card);
1076 }
1077
1078 if (err)
1079 goto out;
1080
1081 /* Allow SDIO IRQs to be processed again. */
1082 mmc_card_clr_suspended(host->card);
1083
1084 if (host->sdio_irqs) {
1085 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1086 wake_up_process(host->sdio_irq_thread);
1087 else if (host->caps & MMC_CAP_SDIO_IRQ)
1088 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1089 }
1090
1091out:
1092 mmc_release_host(host);
1093
1094 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1095 return err;
1096}
1097
1098static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1099{
1100 /* No references to the card, cut the power to it. */
1101 mmc_claim_host(host);
1102 mmc_power_off(host);
1103 mmc_release_host(host);
1104
1105 return 0;
1106}
1107
1108static int mmc_sdio_runtime_resume(struct mmc_host *host)
1109{
1110 int ret;
1111
1112 /* Restore power and re-initialize. */
1113 mmc_claim_host(host);
1114 mmc_power_up(host, host->card->ocr);
1115 ret = mmc_sdio_reinit_card(host);
1116 mmc_release_host(host);
1117
1118 return ret;
1119}
1120
1121/*
1122 * SDIO HW reset
1123 *
1124 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1125 * reset was asynchronously scheduled, else a negative error code.
1126 */
1127static int mmc_sdio_hw_reset(struct mmc_host *host)
1128{
1129 struct mmc_card *card = host->card;
1130
1131 /*
1132 * In case the card is shared among multiple func drivers, reset the
1133 * card through a rescan work. In this way it will be removed and
1134 * re-detected, thus all func drivers becomes informed about it.
1135 */
1136 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1137 if (mmc_card_removed(card))
1138 return 1;
1139 host->rescan_entered = 0;
1140 mmc_card_set_removed(card);
1141 _mmc_detect_change(host, 0, false);
1142 return 1;
1143 }
1144
1145 /*
1146 * A single func driver has been probed, then let's skip the heavy
1147 * hotplug dance above and execute the reset immediately.
1148 */
1149 mmc_power_cycle(host, card->ocr);
1150 return mmc_sdio_reinit_card(host);
1151}
1152
1153static int mmc_sdio_sw_reset(struct mmc_host *host)
1154{
1155 mmc_set_clock(host, host->f_init);
1156 sdio_reset(host);
1157 mmc_go_idle(host);
1158
1159 mmc_set_initial_state(host);
1160 mmc_set_initial_signal_voltage(host);
1161
1162 return mmc_sdio_reinit_card(host);
1163}
1164
1165static const struct mmc_bus_ops mmc_sdio_ops = {
1166 .remove = mmc_sdio_remove,
1167 .detect = mmc_sdio_detect,
1168 .pre_suspend = mmc_sdio_pre_suspend,
1169 .suspend = mmc_sdio_suspend,
1170 .resume = mmc_sdio_resume,
1171 .runtime_suspend = mmc_sdio_runtime_suspend,
1172 .runtime_resume = mmc_sdio_runtime_resume,
1173 .alive = mmc_sdio_alive,
1174 .hw_reset = mmc_sdio_hw_reset,
1175 .sw_reset = mmc_sdio_sw_reset,
1176};
1177
1178
1179/*
1180 * Starting point for SDIO card init.
1181 */
1182int mmc_attach_sdio(struct mmc_host *host)
1183{
1184 int err, i, funcs;
1185 u32 ocr, rocr;
1186 struct mmc_card *card;
1187
1188 WARN_ON(!host->claimed);
1189
1190 err = mmc_send_io_op_cond(host, 0, &ocr);
1191 if (err)
1192 return err;
1193
1194 mmc_attach_bus(host, &mmc_sdio_ops);
1195 if (host->ocr_avail_sdio)
1196 host->ocr_avail = host->ocr_avail_sdio;
1197
1198
1199 rocr = mmc_select_voltage(host, ocr);
1200
1201 /*
1202 * Can we support the voltage(s) of the card(s)?
1203 */
1204 if (!rocr) {
1205 err = -EINVAL;
1206 goto err;
1207 }
1208
1209 /*
1210 * Detect and init the card.
1211 */
1212 err = mmc_sdio_init_card(host, rocr, NULL);
1213 if (err)
1214 goto err;
1215
1216 card = host->card;
1217
1218 /*
1219 * Enable runtime PM only if supported by host+card+board
1220 */
1221 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1222 /*
1223 * Do not allow runtime suspend until after SDIO function
1224 * devices are added.
1225 */
1226 pm_runtime_get_noresume(&card->dev);
1227
1228 /*
1229 * Let runtime PM core know our card is active
1230 */
1231 err = pm_runtime_set_active(&card->dev);
1232 if (err)
1233 goto remove;
1234
1235 /*
1236 * Enable runtime PM for this card
1237 */
1238 pm_runtime_enable(&card->dev);
1239 }
1240
1241 /*
1242 * The number of functions on the card is encoded inside
1243 * the ocr.
1244 */
1245 funcs = (ocr & 0x70000000) >> 28;
1246 card->sdio_funcs = 0;
1247
1248 /*
1249 * Initialize (but don't add) all present functions.
1250 */
1251 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1252 err = sdio_init_func(host->card, i + 1);
1253 if (err)
1254 goto remove;
1255
1256 /*
1257 * Enable Runtime PM for this func (if supported)
1258 */
1259 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1260 pm_runtime_enable(&card->sdio_func[i]->dev);
1261 }
1262
1263 /*
1264 * First add the card to the driver model...
1265 */
1266 mmc_release_host(host);
1267 err = mmc_add_card(host->card);
1268 if (err)
1269 goto remove_added;
1270
1271 /*
1272 * ...then the SDIO functions.
1273 */
1274 for (i = 0;i < funcs;i++) {
1275 err = sdio_add_func(host->card->sdio_func[i]);
1276 if (err)
1277 goto remove_added;
1278 }
1279
1280 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1281 pm_runtime_put(&card->dev);
1282
1283 mmc_claim_host(host);
1284 return 0;
1285
1286
1287remove:
1288 mmc_release_host(host);
1289remove_added:
1290 /*
1291 * The devices are being deleted so it is not necessary to disable
1292 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1293 * because it needs to be active to remove any function devices that
1294 * were probed, and after that it gets deleted.
1295 */
1296 mmc_sdio_remove(host);
1297 mmc_claim_host(host);
1298err:
1299 mmc_detach_bus(host);
1300
1301 pr_err("%s: error %d whilst initialising SDIO card\n",
1302 mmc_hostname(host), err);
1303
1304 return err;
1305}
1306