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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/mmc.h>
18#include <linux/mmc/sdio.h>
19#include <linux/mmc/sdio_func.h>
20#include <linux/mmc/sdio_ids.h>
21
22#include "core.h"
23#include "bus.h"
24#include "sd.h"
25#include "sdio_bus.h"
26#include "mmc_ops.h"
27#include "sd_ops.h"
28#include "sdio_ops.h"
29#include "sdio_cis.h"
30
31static int sdio_read_fbr(struct sdio_func *func)
32{
33 int ret;
34 unsigned char data;
35
36 if (mmc_card_nonstd_func_interface(func->card)) {
37 func->class = SDIO_CLASS_NONE;
38 return 0;
39 }
40
41 ret = mmc_io_rw_direct(func->card, 0, 0,
42 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
43 if (ret)
44 goto out;
45
46 data &= 0x0f;
47
48 if (data == 0x0f) {
49 ret = mmc_io_rw_direct(func->card, 0, 0,
50 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
51 if (ret)
52 goto out;
53 }
54
55 func->class = data;
56
57out:
58 return ret;
59}
60
61static int sdio_init_func(struct mmc_card *card, unsigned int fn)
62{
63 int ret;
64 struct sdio_func *func;
65
66 BUG_ON(fn > SDIO_MAX_FUNCS);
67
68 func = sdio_alloc_func(card);
69 if (IS_ERR(func))
70 return PTR_ERR(func);
71
72 func->num = fn;
73
74 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
75 ret = sdio_read_fbr(func);
76 if (ret)
77 goto fail;
78
79 ret = sdio_read_func_cis(func);
80 if (ret)
81 goto fail;
82 } else {
83 func->vendor = func->card->cis.vendor;
84 func->device = func->card->cis.device;
85 func->max_blksize = func->card->cis.blksize;
86 }
87
88 card->sdio_func[fn - 1] = func;
89
90 return 0;
91
92fail:
93 /*
94 * It is okay to remove the function here even though we hold
95 * the host lock as we haven't registered the device yet.
96 */
97 sdio_remove_func(func);
98 return ret;
99}
100
101static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
102{
103 int ret;
104 int cccr_vsn;
105 int uhs = ocr & R4_18V_PRESENT;
106 unsigned char data;
107 unsigned char speed;
108
109 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
110 if (ret)
111 goto out;
112
113 cccr_vsn = data & 0x0f;
114
115 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
116 pr_err("%s: unrecognised CCCR structure version %d\n",
117 mmc_hostname(card->host), cccr_vsn);
118 return -EINVAL;
119 }
120
121 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
122
123 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
124 if (ret)
125 goto out;
126
127 if (data & SDIO_CCCR_CAP_SMB)
128 card->cccr.multi_block = 1;
129 if (data & SDIO_CCCR_CAP_LSC)
130 card->cccr.low_speed = 1;
131 if (data & SDIO_CCCR_CAP_4BLS)
132 card->cccr.wide_bus = 1;
133
134 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
135 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
136 if (ret)
137 goto out;
138
139 if (data & SDIO_POWER_SMPC)
140 card->cccr.high_power = 1;
141 }
142
143 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
144 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
145 if (ret)
146 goto out;
147
148 card->scr.sda_spec3 = 0;
149 card->sw_caps.sd3_bus_mode = 0;
150 card->sw_caps.sd3_drv_type = 0;
151 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
152 card->scr.sda_spec3 = 1;
153 ret = mmc_io_rw_direct(card, 0, 0,
154 SDIO_CCCR_UHS, 0, &data);
155 if (ret)
156 goto out;
157
158 if (mmc_host_uhs(card->host)) {
159 if (data & SDIO_UHS_DDR50)
160 card->sw_caps.sd3_bus_mode
161 |= SD_MODE_UHS_DDR50;
162
163 if (data & SDIO_UHS_SDR50)
164 card->sw_caps.sd3_bus_mode
165 |= SD_MODE_UHS_SDR50;
166
167 if (data & SDIO_UHS_SDR104)
168 card->sw_caps.sd3_bus_mode
169 |= SD_MODE_UHS_SDR104;
170 }
171
172 ret = mmc_io_rw_direct(card, 0, 0,
173 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
174 if (ret)
175 goto out;
176
177 if (data & SDIO_DRIVE_SDTA)
178 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
179 if (data & SDIO_DRIVE_SDTC)
180 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
181 if (data & SDIO_DRIVE_SDTD)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
183 }
184
185 /* if no uhs mode ensure we check for high speed */
186 if (!card->sw_caps.sd3_bus_mode) {
187 if (speed & SDIO_SPEED_SHS) {
188 card->cccr.high_speed = 1;
189 card->sw_caps.hs_max_dtr = 50000000;
190 } else {
191 card->cccr.high_speed = 0;
192 card->sw_caps.hs_max_dtr = 25000000;
193 }
194 }
195 }
196
197out:
198 return ret;
199}
200
201static int sdio_enable_wide(struct mmc_card *card)
202{
203 int ret;
204 u8 ctrl;
205
206 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
207 return 0;
208
209 if (card->cccr.low_speed && !card->cccr.wide_bus)
210 return 0;
211
212 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
213 if (ret)
214 return ret;
215
216 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
217 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
218 mmc_hostname(card->host), ctrl);
219
220 /* set as 4-bit bus width */
221 ctrl &= ~SDIO_BUS_WIDTH_MASK;
222 ctrl |= SDIO_BUS_WIDTH_4BIT;
223
224 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
225 if (ret)
226 return ret;
227
228 return 1;
229}
230
231/*
232 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
233 * of the card. This may be required on certain setups of boards,
234 * controllers and embedded sdio device which do not need the card's
235 * pull-up. As a result, card detection is disabled and power is saved.
236 */
237static int sdio_disable_cd(struct mmc_card *card)
238{
239 int ret;
240 u8 ctrl;
241
242 if (!mmc_card_disable_cd(card))
243 return 0;
244
245 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
246 if (ret)
247 return ret;
248
249 ctrl |= SDIO_BUS_CD_DISABLE;
250
251 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
252}
253
254/*
255 * Devices that remain active during a system suspend are
256 * put back into 1-bit mode.
257 */
258static int sdio_disable_wide(struct mmc_card *card)
259{
260 int ret;
261 u8 ctrl;
262
263 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
264 return 0;
265
266 if (card->cccr.low_speed && !card->cccr.wide_bus)
267 return 0;
268
269 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
270 if (ret)
271 return ret;
272
273 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
274 return 0;
275
276 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
277 ctrl |= SDIO_BUS_ASYNC_INT;
278
279 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
280 if (ret)
281 return ret;
282
283 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
284
285 return 0;
286}
287
288
289static int sdio_enable_4bit_bus(struct mmc_card *card)
290{
291 int err;
292
293 if (card->type == MMC_TYPE_SDIO)
294 err = sdio_enable_wide(card);
295 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
296 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
297 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
298 if (err)
299 return err;
300 err = sdio_enable_wide(card);
301 if (err <= 0)
302 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
303 } else
304 return 0;
305
306 if (err > 0) {
307 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
308 err = 0;
309 }
310
311 return err;
312}
313
314
315/*
316 * Test if the card supports high-speed mode and, if so, switch to it.
317 */
318static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
319{
320 int ret;
321 u8 speed;
322
323 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
324 return 0;
325
326 if (!card->cccr.high_speed)
327 return 0;
328
329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
330 if (ret)
331 return ret;
332
333 if (enable)
334 speed |= SDIO_SPEED_EHS;
335 else
336 speed &= ~SDIO_SPEED_EHS;
337
338 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
339 if (ret)
340 return ret;
341
342 return 1;
343}
344
345/*
346 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
347 */
348static int sdio_enable_hs(struct mmc_card *card)
349{
350 int ret;
351
352 ret = mmc_sdio_switch_hs(card, true);
353 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
354 return ret;
355
356 ret = mmc_sd_switch_hs(card);
357 if (ret <= 0)
358 mmc_sdio_switch_hs(card, false);
359
360 return ret;
361}
362
363static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
364{
365 unsigned max_dtr;
366
367 if (mmc_card_hs(card)) {
368 /*
369 * The SDIO specification doesn't mention how
370 * the CIS transfer speed register relates to
371 * high-speed, but it seems that 50 MHz is
372 * mandatory.
373 */
374 max_dtr = 50000000;
375 } else {
376 max_dtr = card->cis.max_dtr;
377 }
378
379 if (card->type == MMC_TYPE_SD_COMBO)
380 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
381
382 return max_dtr;
383}
384
385static unsigned char host_drive_to_sdio_drive(int host_strength)
386{
387 switch (host_strength) {
388 case MMC_SET_DRIVER_TYPE_A:
389 return SDIO_DTSx_SET_TYPE_A;
390 case MMC_SET_DRIVER_TYPE_B:
391 return SDIO_DTSx_SET_TYPE_B;
392 case MMC_SET_DRIVER_TYPE_C:
393 return SDIO_DTSx_SET_TYPE_C;
394 case MMC_SET_DRIVER_TYPE_D:
395 return SDIO_DTSx_SET_TYPE_D;
396 default:
397 return SDIO_DTSx_SET_TYPE_B;
398 }
399}
400
401static void sdio_select_driver_type(struct mmc_card *card)
402{
403 int card_drv_type, drive_strength, drv_type;
404 unsigned char card_strength;
405 int err;
406
407 card->drive_strength = 0;
408
409 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
410
411 drive_strength = mmc_select_drive_strength(card,
412 card->sw_caps.uhs_max_dtr,
413 card_drv_type, &drv_type);
414
415 if (drive_strength) {
416 /* if error just use default for drive strength B */
417 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
418 &card_strength);
419 if (err)
420 return;
421
422 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
423 card_strength |= host_drive_to_sdio_drive(drive_strength);
424
425 /* if error default to drive strength B */
426 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
427 card_strength, NULL);
428 if (err)
429 return;
430 card->drive_strength = drive_strength;
431 }
432
433 if (drv_type)
434 mmc_set_driver_type(card->host, drv_type);
435}
436
437
438static int sdio_set_bus_speed_mode(struct mmc_card *card)
439{
440 unsigned int bus_speed, timing;
441 int err;
442 unsigned char speed;
443
444 /*
445 * If the host doesn't support any of the UHS-I modes, fallback on
446 * default speed.
447 */
448 if (!mmc_host_uhs(card->host))
449 return 0;
450
451 bus_speed = SDIO_SPEED_SDR12;
452 timing = MMC_TIMING_UHS_SDR12;
453 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
454 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
455 bus_speed = SDIO_SPEED_SDR104;
456 timing = MMC_TIMING_UHS_SDR104;
457 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
458 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
459 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
460 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
461 bus_speed = SDIO_SPEED_DDR50;
462 timing = MMC_TIMING_UHS_DDR50;
463 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
464 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
465 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
466 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
467 SD_MODE_UHS_SDR50)) {
468 bus_speed = SDIO_SPEED_SDR50;
469 timing = MMC_TIMING_UHS_SDR50;
470 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
471 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
472 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
473 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
474 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
475 bus_speed = SDIO_SPEED_SDR25;
476 timing = MMC_TIMING_UHS_SDR25;
477 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
478 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
479 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
480 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
481 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
482 SD_MODE_UHS_SDR12)) {
483 bus_speed = SDIO_SPEED_SDR12;
484 timing = MMC_TIMING_UHS_SDR12;
485 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
486 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
487 }
488
489 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
490 if (err)
491 return err;
492
493 speed &= ~SDIO_SPEED_BSS_MASK;
494 speed |= bus_speed;
495 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
496 if (err)
497 return err;
498
499 if (bus_speed) {
500 mmc_set_timing(card->host, timing);
501 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
502 }
503
504 return 0;
505}
506
507/*
508 * UHS-I specific initialization procedure
509 */
510static int mmc_sdio_init_uhs_card(struct mmc_card *card)
511{
512 int err;
513
514 if (!card->scr.sda_spec3)
515 return 0;
516
517 /*
518 * Switch to wider bus (if supported).
519 */
520 if (card->host->caps & MMC_CAP_4_BIT_DATA)
521 err = sdio_enable_4bit_bus(card);
522
523 /* Set the driver strength for the card */
524 sdio_select_driver_type(card);
525
526 /* Set bus speed mode of the card */
527 err = sdio_set_bus_speed_mode(card);
528 if (err)
529 goto out;
530
531 /*
532 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
533 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
534 */
535 if (!mmc_host_is_spi(card->host) &&
536 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
537 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
538 err = mmc_execute_tuning(card);
539out:
540 return err;
541}
542
543/*
544 * Handle the detection and initialisation of a card.
545 *
546 * In the case of a resume, "oldcard" will contain the card
547 * we're trying to reinitialise.
548 */
549static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
550 struct mmc_card *oldcard, int powered_resume)
551{
552 struct mmc_card *card;
553 int err;
554 int retries = 10;
555 u32 rocr = 0;
556 u32 ocr_card = ocr;
557
558 BUG_ON(!host);
559 WARN_ON(!host->claimed);
560
561 /* to query card if 1.8V signalling is supported */
562 if (mmc_host_uhs(host))
563 ocr |= R4_18V_PRESENT;
564
565try_again:
566 if (!retries) {
567 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
568 ocr &= ~R4_18V_PRESENT;
569 }
570
571 /*
572 * Inform the card of the voltage
573 */
574 if (!powered_resume) {
575 err = mmc_send_io_op_cond(host, ocr, &rocr);
576 if (err)
577 goto err;
578 }
579
580 /*
581 * For SPI, enable CRC as appropriate.
582 */
583 if (mmc_host_is_spi(host)) {
584 err = mmc_spi_set_crc(host, use_spi_crc);
585 if (err)
586 goto err;
587 }
588
589 /*
590 * Allocate card structure.
591 */
592 card = mmc_alloc_card(host, NULL);
593 if (IS_ERR(card)) {
594 err = PTR_ERR(card);
595 goto err;
596 }
597
598 if ((rocr & R4_MEMORY_PRESENT) &&
599 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
600 card->type = MMC_TYPE_SD_COMBO;
601
602 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
603 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
604 mmc_remove_card(card);
605 return -ENOENT;
606 }
607 } else {
608 card->type = MMC_TYPE_SDIO;
609
610 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
611 mmc_remove_card(card);
612 return -ENOENT;
613 }
614 }
615
616 /*
617 * Call the optional HC's init_card function to handle quirks.
618 */
619 if (host->ops->init_card)
620 host->ops->init_card(host, card);
621
622 /*
623 * If the host and card support UHS-I mode request the card
624 * to switch to 1.8V signaling level. No 1.8v signalling if
625 * UHS mode is not enabled to maintain compatibility and some
626 * systems that claim 1.8v signalling in fact do not support
627 * it.
628 */
629 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
630 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
631 ocr_card);
632 if (err == -EAGAIN) {
633 sdio_reset(host);
634 mmc_go_idle(host);
635 mmc_send_if_cond(host, host->ocr_avail);
636 mmc_remove_card(card);
637 retries--;
638 goto try_again;
639 } else if (err) {
640 ocr &= ~R4_18V_PRESENT;
641 }
642 err = 0;
643 } else {
644 ocr &= ~R4_18V_PRESENT;
645 }
646
647 /*
648 * For native busses: set card RCA and quit open drain mode.
649 */
650 if (!powered_resume && !mmc_host_is_spi(host)) {
651 err = mmc_send_relative_addr(host, &card->rca);
652 if (err)
653 goto remove;
654
655 /*
656 * Update oldcard with the new RCA received from the SDIO
657 * device -- we're doing this so that it's updated in the
658 * "card" struct when oldcard overwrites that later.
659 */
660 if (oldcard)
661 oldcard->rca = card->rca;
662 }
663
664 /*
665 * Read CSD, before selecting the card
666 */
667 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
668 err = mmc_sd_get_csd(host, card);
669 if (err)
670 return err;
671
672 mmc_decode_cid(card);
673 }
674
675 /*
676 * Select card, as all following commands rely on that.
677 */
678 if (!powered_resume && !mmc_host_is_spi(host)) {
679 err = mmc_select_card(card);
680 if (err)
681 goto remove;
682 }
683
684 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
685 /*
686 * This is non-standard SDIO device, meaning it doesn't
687 * have any CIA (Common I/O area) registers present.
688 * It's host's responsibility to fill cccr and cis
689 * structures in init_card().
690 */
691 mmc_set_clock(host, card->cis.max_dtr);
692
693 if (card->cccr.high_speed) {
694 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
695 }
696
697 goto finish;
698 }
699
700 /*
701 * Read the common registers.
702 */
703 err = sdio_read_cccr(card, ocr);
704 if (err)
705 goto remove;
706
707 /*
708 * Read the common CIS tuples.
709 */
710 err = sdio_read_common_cis(card);
711 if (err)
712 goto remove;
713
714 if (oldcard) {
715 int same = (card->cis.vendor == oldcard->cis.vendor &&
716 card->cis.device == oldcard->cis.device);
717 mmc_remove_card(card);
718 if (!same)
719 return -ENOENT;
720
721 card = oldcard;
722 }
723 card->ocr = ocr_card;
724 mmc_fixup_device(card, NULL);
725
726 if (card->type == MMC_TYPE_SD_COMBO) {
727 err = mmc_sd_setup_card(host, card, oldcard != NULL);
728 /* handle as SDIO-only card if memory init failed */
729 if (err) {
730 mmc_go_idle(host);
731 if (mmc_host_is_spi(host))
732 /* should not fail, as it worked previously */
733 mmc_spi_set_crc(host, use_spi_crc);
734 card->type = MMC_TYPE_SDIO;
735 } else
736 card->dev.type = &sd_type;
737 }
738
739 /*
740 * If needed, disconnect card detection pull-up resistor.
741 */
742 err = sdio_disable_cd(card);
743 if (err)
744 goto remove;
745
746 /* Initialization sequence for UHS-I cards */
747 /* Only if card supports 1.8v and UHS signaling */
748 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
749 err = mmc_sdio_init_uhs_card(card);
750 if (err)
751 goto remove;
752 } else {
753 /*
754 * Switch to high-speed (if supported).
755 */
756 err = sdio_enable_hs(card);
757 if (err > 0)
758 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
759 else if (err)
760 goto remove;
761
762 /*
763 * Change to the card's maximum speed.
764 */
765 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
766
767 /*
768 * Switch to wider bus (if supported).
769 */
770 err = sdio_enable_4bit_bus(card);
771 if (err)
772 goto remove;
773 }
774finish:
775 if (!oldcard)
776 host->card = card;
777 return 0;
778
779remove:
780 if (!oldcard)
781 mmc_remove_card(card);
782
783err:
784 return err;
785}
786
787/*
788 * Host is being removed. Free up the current card.
789 */
790static void mmc_sdio_remove(struct mmc_host *host)
791{
792 int i;
793
794 BUG_ON(!host);
795 BUG_ON(!host->card);
796
797 for (i = 0;i < host->card->sdio_funcs;i++) {
798 if (host->card->sdio_func[i]) {
799 sdio_remove_func(host->card->sdio_func[i]);
800 host->card->sdio_func[i] = NULL;
801 }
802 }
803
804 mmc_remove_card(host->card);
805 host->card = NULL;
806}
807
808/*
809 * Card detection - card is alive.
810 */
811static int mmc_sdio_alive(struct mmc_host *host)
812{
813 return mmc_select_card(host->card);
814}
815
816/*
817 * Card detection callback from host.
818 */
819static void mmc_sdio_detect(struct mmc_host *host)
820{
821 int err;
822
823 BUG_ON(!host);
824 BUG_ON(!host->card);
825
826 /* Make sure card is powered before detecting it */
827 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
828 err = pm_runtime_get_sync(&host->card->dev);
829 if (err < 0) {
830 pm_runtime_put_noidle(&host->card->dev);
831 goto out;
832 }
833 }
834
835 mmc_claim_host(host);
836
837 /*
838 * Just check if our card has been removed.
839 */
840 err = _mmc_detect_card_removed(host);
841
842 mmc_release_host(host);
843
844 /*
845 * Tell PM core it's OK to power off the card now.
846 *
847 * The _sync variant is used in order to ensure that the card
848 * is left powered off in case an error occurred, and the card
849 * is going to be removed.
850 *
851 * Since there is no specific reason to believe a new user
852 * is about to show up at this point, the _sync variant is
853 * desirable anyway.
854 */
855 if (host->caps & MMC_CAP_POWER_OFF_CARD)
856 pm_runtime_put_sync(&host->card->dev);
857
858out:
859 if (err) {
860 mmc_sdio_remove(host);
861
862 mmc_claim_host(host);
863 mmc_detach_bus(host);
864 mmc_power_off(host);
865 mmc_release_host(host);
866 }
867}
868
869/*
870 * SDIO pre_suspend. We need to suspend all functions separately.
871 * Therefore all registered functions must have drivers with suspend
872 * and resume methods. Failing that we simply remove the whole card.
873 */
874static int mmc_sdio_pre_suspend(struct mmc_host *host)
875{
876 int i, err = 0;
877
878 for (i = 0; i < host->card->sdio_funcs; i++) {
879 struct sdio_func *func = host->card->sdio_func[i];
880 if (func && sdio_func_present(func) && func->dev.driver) {
881 const struct dev_pm_ops *pmops = func->dev.driver->pm;
882 if (!pmops || !pmops->suspend || !pmops->resume) {
883 /* force removal of entire card in that case */
884 err = -ENOSYS;
885 break;
886 }
887 }
888 }
889
890 return err;
891}
892
893/*
894 * SDIO suspend. Suspend all functions separately.
895 */
896static int mmc_sdio_suspend(struct mmc_host *host)
897{
898 mmc_claim_host(host);
899
900 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
901 sdio_disable_wide(host->card);
902
903 if (!mmc_card_keep_power(host)) {
904 mmc_power_off(host);
905 } else if (host->retune_period) {
906 mmc_retune_timer_stop(host);
907 mmc_retune_needed(host);
908 }
909
910 mmc_release_host(host);
911
912 return 0;
913}
914
915static int mmc_sdio_resume(struct mmc_host *host)
916{
917 int err = 0;
918
919 BUG_ON(!host);
920 BUG_ON(!host->card);
921
922 /* Basic card reinitialization. */
923 mmc_claim_host(host);
924
925 /* Restore power if needed */
926 if (!mmc_card_keep_power(host)) {
927 mmc_power_up(host, host->card->ocr);
928 /*
929 * Tell runtime PM core we just powered up the card,
930 * since it still believes the card is powered off.
931 * Note that currently runtime PM is only enabled
932 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
933 */
934 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
935 pm_runtime_disable(&host->card->dev);
936 pm_runtime_set_active(&host->card->dev);
937 pm_runtime_enable(&host->card->dev);
938 }
939 }
940
941 /* No need to reinitialize powered-resumed nonremovable cards */
942 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
943 sdio_reset(host);
944 mmc_go_idle(host);
945 mmc_send_if_cond(host, host->card->ocr);
946 err = mmc_send_io_op_cond(host, 0, NULL);
947 if (!err)
948 err = mmc_sdio_init_card(host, host->card->ocr,
949 host->card,
950 mmc_card_keep_power(host));
951 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
952 /* We may have switched to 1-bit mode during suspend */
953 err = sdio_enable_4bit_bus(host->card);
954 }
955
956 if (!err && host->sdio_irqs) {
957 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
958 wake_up_process(host->sdio_irq_thread);
959 else if (host->caps & MMC_CAP_SDIO_IRQ)
960 host->ops->enable_sdio_irq(host, 1);
961 }
962
963 mmc_release_host(host);
964
965 host->pm_flags &= ~MMC_PM_KEEP_POWER;
966 return err;
967}
968
969static int mmc_sdio_power_restore(struct mmc_host *host)
970{
971 int ret;
972
973 BUG_ON(!host);
974 BUG_ON(!host->card);
975
976 mmc_claim_host(host);
977
978 /*
979 * Reset the card by performing the same steps that are taken by
980 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
981 *
982 * sdio_reset() is technically not needed. Having just powered up the
983 * hardware, it should already be in reset state. However, some
984 * platforms (such as SD8686 on OLPC) do not instantly cut power,
985 * meaning that a reset is required when restoring power soon after
986 * powering off. It is harmless in other cases.
987 *
988 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
989 * is not necessary for non-removable cards. However, it is required
990 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
991 * harmless in other situations.
992 *
993 */
994
995 sdio_reset(host);
996 mmc_go_idle(host);
997 mmc_send_if_cond(host, host->card->ocr);
998
999 ret = mmc_send_io_op_cond(host, 0, NULL);
1000 if (ret)
1001 goto out;
1002
1003 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1004 mmc_card_keep_power(host));
1005 if (!ret && host->sdio_irqs)
1006 mmc_signal_sdio_irq(host);
1007
1008out:
1009 mmc_release_host(host);
1010
1011 return ret;
1012}
1013
1014static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1015{
1016 /* No references to the card, cut the power to it. */
1017 mmc_claim_host(host);
1018 mmc_power_off(host);
1019 mmc_release_host(host);
1020
1021 return 0;
1022}
1023
1024static int mmc_sdio_runtime_resume(struct mmc_host *host)
1025{
1026 int ret;
1027
1028 /* Restore power and re-initialize. */
1029 mmc_claim_host(host);
1030 mmc_power_up(host, host->card->ocr);
1031 ret = mmc_sdio_power_restore(host);
1032 mmc_release_host(host);
1033
1034 return ret;
1035}
1036
1037static int mmc_sdio_reset(struct mmc_host *host)
1038{
1039 mmc_power_cycle(host, host->card->ocr);
1040 return mmc_sdio_power_restore(host);
1041}
1042
1043static const struct mmc_bus_ops mmc_sdio_ops = {
1044 .remove = mmc_sdio_remove,
1045 .detect = mmc_sdio_detect,
1046 .pre_suspend = mmc_sdio_pre_suspend,
1047 .suspend = mmc_sdio_suspend,
1048 .resume = mmc_sdio_resume,
1049 .runtime_suspend = mmc_sdio_runtime_suspend,
1050 .runtime_resume = mmc_sdio_runtime_resume,
1051 .power_restore = mmc_sdio_power_restore,
1052 .alive = mmc_sdio_alive,
1053 .reset = mmc_sdio_reset,
1054};
1055
1056
1057/*
1058 * Starting point for SDIO card init.
1059 */
1060int mmc_attach_sdio(struct mmc_host *host)
1061{
1062 int err, i, funcs;
1063 u32 ocr, rocr;
1064 struct mmc_card *card;
1065
1066 BUG_ON(!host);
1067 WARN_ON(!host->claimed);
1068
1069 err = mmc_send_io_op_cond(host, 0, &ocr);
1070 if (err)
1071 return err;
1072
1073 mmc_attach_bus(host, &mmc_sdio_ops);
1074 if (host->ocr_avail_sdio)
1075 host->ocr_avail = host->ocr_avail_sdio;
1076
1077
1078 rocr = mmc_select_voltage(host, ocr);
1079
1080 /*
1081 * Can we support the voltage(s) of the card(s)?
1082 */
1083 if (!rocr) {
1084 err = -EINVAL;
1085 goto err;
1086 }
1087
1088 /*
1089 * Detect and init the card.
1090 */
1091 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1092 if (err)
1093 goto err;
1094
1095 card = host->card;
1096
1097 /*
1098 * Enable runtime PM only if supported by host+card+board
1099 */
1100 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1101 /*
1102 * Let runtime PM core know our card is active
1103 */
1104 err = pm_runtime_set_active(&card->dev);
1105 if (err)
1106 goto remove;
1107
1108 /*
1109 * Enable runtime PM for this card
1110 */
1111 pm_runtime_enable(&card->dev);
1112 }
1113
1114 /*
1115 * The number of functions on the card is encoded inside
1116 * the ocr.
1117 */
1118 funcs = (ocr & 0x70000000) >> 28;
1119 card->sdio_funcs = 0;
1120
1121 /*
1122 * Initialize (but don't add) all present functions.
1123 */
1124 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1125 err = sdio_init_func(host->card, i + 1);
1126 if (err)
1127 goto remove;
1128
1129 /*
1130 * Enable Runtime PM for this func (if supported)
1131 */
1132 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1133 pm_runtime_enable(&card->sdio_func[i]->dev);
1134 }
1135
1136 /*
1137 * First add the card to the driver model...
1138 */
1139 mmc_release_host(host);
1140 err = mmc_add_card(host->card);
1141 if (err)
1142 goto remove_added;
1143
1144 /*
1145 * ...then the SDIO functions.
1146 */
1147 for (i = 0;i < funcs;i++) {
1148 err = sdio_add_func(host->card->sdio_func[i]);
1149 if (err)
1150 goto remove_added;
1151 }
1152
1153 mmc_claim_host(host);
1154 return 0;
1155
1156
1157remove_added:
1158 /* Remove without lock if the device has been added. */
1159 mmc_sdio_remove(host);
1160 mmc_claim_host(host);
1161remove:
1162 /* And with lock if it hasn't been added. */
1163 mmc_release_host(host);
1164 if (host->card)
1165 mmc_sdio_remove(host);
1166 mmc_claim_host(host);
1167err:
1168 mmc_detach_bus(host);
1169
1170 pr_err("%s: error %d whilst initialising SDIO card\n",
1171 mmc_hostname(host), err);
1172
1173 return err;
1174}
1175
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#include <linux/sysfs.h>
11
12#include <linux/mmc/host.h>
13#include <linux/mmc/card.h>
14#include <linux/mmc/mmc.h>
15#include <linux/mmc/sdio.h>
16#include <linux/mmc/sdio_func.h>
17#include <linux/mmc/sdio_ids.h>
18
19#include "core.h"
20#include "card.h"
21#include "host.h"
22#include "bus.h"
23#include "quirks.h"
24#include "sd.h"
25#include "sdio_bus.h"
26#include "mmc_ops.h"
27#include "sd_ops.h"
28#include "sdio_ops.h"
29#include "sdio_cis.h"
30
31MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
32MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
33MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
34MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
35MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
36
37#define sdio_info_attr(num) \
38static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
39{ \
40 struct mmc_card *card = mmc_dev_to_card(dev); \
41 \
42 if (num > card->num_info) \
43 return -ENODATA; \
44 if (!card->info[num - 1][0]) \
45 return 0; \
46 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
47} \
48static DEVICE_ATTR_RO(info##num)
49
50sdio_info_attr(1);
51sdio_info_attr(2);
52sdio_info_attr(3);
53sdio_info_attr(4);
54
55static struct attribute *sdio_std_attrs[] = {
56 &dev_attr_vendor.attr,
57 &dev_attr_device.attr,
58 &dev_attr_revision.attr,
59 &dev_attr_info1.attr,
60 &dev_attr_info2.attr,
61 &dev_attr_info3.attr,
62 &dev_attr_info4.attr,
63 &dev_attr_ocr.attr,
64 &dev_attr_rca.attr,
65 NULL,
66};
67ATTRIBUTE_GROUPS(sdio_std);
68
69static const struct device_type sdio_type = {
70 .groups = sdio_std_groups,
71};
72
73static int sdio_read_fbr(struct sdio_func *func)
74{
75 int ret;
76 unsigned char data;
77
78 if (mmc_card_nonstd_func_interface(func->card)) {
79 func->class = SDIO_CLASS_NONE;
80 return 0;
81 }
82
83 ret = mmc_io_rw_direct(func->card, 0, 0,
84 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
85 if (ret)
86 goto out;
87
88 data &= 0x0f;
89
90 if (data == 0x0f) {
91 ret = mmc_io_rw_direct(func->card, 0, 0,
92 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
93 if (ret)
94 goto out;
95 }
96
97 func->class = data;
98
99out:
100 return ret;
101}
102
103static int sdio_init_func(struct mmc_card *card, unsigned int fn)
104{
105 int ret;
106 struct sdio_func *func;
107
108 if (WARN_ON(fn > SDIO_MAX_FUNCS))
109 return -EINVAL;
110
111 func = sdio_alloc_func(card);
112 if (IS_ERR(func))
113 return PTR_ERR(func);
114
115 func->num = fn;
116
117 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
118 ret = sdio_read_fbr(func);
119 if (ret)
120 goto fail;
121
122 ret = sdio_read_func_cis(func);
123 if (ret)
124 goto fail;
125 } else {
126 func->vendor = func->card->cis.vendor;
127 func->device = func->card->cis.device;
128 func->max_blksize = func->card->cis.blksize;
129 }
130
131 card->sdio_func[fn - 1] = func;
132
133 return 0;
134
135fail:
136 /*
137 * It is okay to remove the function here even though we hold
138 * the host lock as we haven't registered the device yet.
139 */
140 sdio_remove_func(func);
141 return ret;
142}
143
144static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
145{
146 int ret;
147 int cccr_vsn;
148 int uhs = ocr & R4_18V_PRESENT;
149 unsigned char data;
150 unsigned char speed;
151
152 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
153 if (ret)
154 goto out;
155
156 cccr_vsn = data & 0x0f;
157
158 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
159 pr_err("%s: unrecognised CCCR structure version %d\n",
160 mmc_hostname(card->host), cccr_vsn);
161 return -EINVAL;
162 }
163
164 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
165
166 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
167 if (ret)
168 goto out;
169
170 if (data & SDIO_CCCR_CAP_SMB)
171 card->cccr.multi_block = 1;
172 if (data & SDIO_CCCR_CAP_LSC)
173 card->cccr.low_speed = 1;
174 if (data & SDIO_CCCR_CAP_4BLS)
175 card->cccr.wide_bus = 1;
176
177 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
178 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
179 if (ret)
180 goto out;
181
182 if (data & SDIO_POWER_SMPC)
183 card->cccr.high_power = 1;
184 }
185
186 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
187 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
188 if (ret)
189 goto out;
190
191 card->scr.sda_spec3 = 0;
192 card->sw_caps.sd3_bus_mode = 0;
193 card->sw_caps.sd3_drv_type = 0;
194 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
195 card->scr.sda_spec3 = 1;
196 ret = mmc_io_rw_direct(card, 0, 0,
197 SDIO_CCCR_UHS, 0, &data);
198 if (ret)
199 goto out;
200
201 if (mmc_host_uhs(card->host)) {
202 if (data & SDIO_UHS_DDR50)
203 card->sw_caps.sd3_bus_mode
204 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
205 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
206
207 if (data & SDIO_UHS_SDR50)
208 card->sw_caps.sd3_bus_mode
209 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
210 | SD_MODE_UHS_SDR12;
211
212 if (data & SDIO_UHS_SDR104)
213 card->sw_caps.sd3_bus_mode
214 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
215 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
216 }
217
218 ret = mmc_io_rw_direct(card, 0, 0,
219 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
220 if (ret)
221 goto out;
222
223 if (data & SDIO_DRIVE_SDTA)
224 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
225 if (data & SDIO_DRIVE_SDTC)
226 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
227 if (data & SDIO_DRIVE_SDTD)
228 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
229
230 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTERRUPT_EXT, 0, &data);
231 if (ret)
232 goto out;
233
234 if (data & SDIO_INTERRUPT_EXT_SAI) {
235 data |= SDIO_INTERRUPT_EXT_EAI;
236 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT,
237 data, NULL);
238 if (ret)
239 goto out;
240
241 card->cccr.enable_async_irq = 1;
242 }
243 }
244
245 /* if no uhs mode ensure we check for high speed */
246 if (!card->sw_caps.sd3_bus_mode) {
247 if (speed & SDIO_SPEED_SHS) {
248 card->cccr.high_speed = 1;
249 card->sw_caps.hs_max_dtr = 50000000;
250 } else {
251 card->cccr.high_speed = 0;
252 card->sw_caps.hs_max_dtr = 25000000;
253 }
254 }
255 }
256
257out:
258 return ret;
259}
260
261static int sdio_enable_wide(struct mmc_card *card)
262{
263 int ret;
264 u8 ctrl;
265
266 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
267 return 0;
268
269 if (card->cccr.low_speed && !card->cccr.wide_bus)
270 return 0;
271
272 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
273 if (ret)
274 return ret;
275
276 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
277 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
278 mmc_hostname(card->host), ctrl);
279
280 /* set as 4-bit bus width */
281 ctrl &= ~SDIO_BUS_WIDTH_MASK;
282 ctrl |= SDIO_BUS_WIDTH_4BIT;
283
284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
285 if (ret)
286 return ret;
287
288 return 1;
289}
290
291/*
292 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
293 * of the card. This may be required on certain setups of boards,
294 * controllers and embedded sdio device which do not need the card's
295 * pull-up. As a result, card detection is disabled and power is saved.
296 */
297static int sdio_disable_cd(struct mmc_card *card)
298{
299 int ret;
300 u8 ctrl;
301
302 if (!mmc_card_disable_cd(card))
303 return 0;
304
305 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
306 if (ret)
307 return ret;
308
309 ctrl |= SDIO_BUS_CD_DISABLE;
310
311 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
312}
313
314/*
315 * Devices that remain active during a system suspend are
316 * put back into 1-bit mode.
317 */
318static int sdio_disable_wide(struct mmc_card *card)
319{
320 int ret;
321 u8 ctrl;
322
323 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
324 return 0;
325
326 if (card->cccr.low_speed && !card->cccr.wide_bus)
327 return 0;
328
329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
330 if (ret)
331 return ret;
332
333 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
334 return 0;
335
336 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
337 ctrl |= SDIO_BUS_ASYNC_INT;
338
339 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
340 if (ret)
341 return ret;
342
343 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
344
345 return 0;
346}
347
348static int sdio_disable_4bit_bus(struct mmc_card *card)
349{
350 int err;
351
352 if (mmc_card_sdio(card))
353 goto out;
354
355 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
356 return 0;
357
358 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
359 return 0;
360
361 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
362 if (err)
363 return err;
364
365out:
366 return sdio_disable_wide(card);
367}
368
369
370static int sdio_enable_4bit_bus(struct mmc_card *card)
371{
372 int err;
373
374 err = sdio_enable_wide(card);
375 if (err <= 0)
376 return err;
377 if (mmc_card_sdio(card))
378 goto out;
379
380 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
381 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
382 if (err) {
383 sdio_disable_wide(card);
384 return err;
385 }
386 }
387out:
388 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
389
390 return 0;
391}
392
393
394/*
395 * Test if the card supports high-speed mode and, if so, switch to it.
396 */
397static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
398{
399 int ret;
400 u8 speed;
401
402 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
403 return 0;
404
405 if (!card->cccr.high_speed)
406 return 0;
407
408 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
409 if (ret)
410 return ret;
411
412 if (enable)
413 speed |= SDIO_SPEED_EHS;
414 else
415 speed &= ~SDIO_SPEED_EHS;
416
417 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
418 if (ret)
419 return ret;
420
421 return 1;
422}
423
424/*
425 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
426 */
427static int sdio_enable_hs(struct mmc_card *card)
428{
429 int ret;
430
431 ret = mmc_sdio_switch_hs(card, true);
432 if (ret <= 0 || mmc_card_sdio(card))
433 return ret;
434
435 ret = mmc_sd_switch_hs(card);
436 if (ret <= 0)
437 mmc_sdio_switch_hs(card, false);
438
439 return ret;
440}
441
442static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
443{
444 unsigned max_dtr;
445
446 if (mmc_card_hs(card)) {
447 /*
448 * The SDIO specification doesn't mention how
449 * the CIS transfer speed register relates to
450 * high-speed, but it seems that 50 MHz is
451 * mandatory.
452 */
453 max_dtr = 50000000;
454 } else {
455 max_dtr = card->cis.max_dtr;
456 }
457
458 if (mmc_card_sd_combo(card))
459 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
460
461 max_dtr = min_not_zero(max_dtr, card->quirk_max_rate);
462
463 return max_dtr;
464}
465
466static unsigned char host_drive_to_sdio_drive(int host_strength)
467{
468 switch (host_strength) {
469 case MMC_SET_DRIVER_TYPE_A:
470 return SDIO_DTSx_SET_TYPE_A;
471 case MMC_SET_DRIVER_TYPE_B:
472 return SDIO_DTSx_SET_TYPE_B;
473 case MMC_SET_DRIVER_TYPE_C:
474 return SDIO_DTSx_SET_TYPE_C;
475 case MMC_SET_DRIVER_TYPE_D:
476 return SDIO_DTSx_SET_TYPE_D;
477 default:
478 return SDIO_DTSx_SET_TYPE_B;
479 }
480}
481
482static void sdio_select_driver_type(struct mmc_card *card)
483{
484 int card_drv_type, drive_strength, drv_type;
485 unsigned char card_strength;
486 int err;
487
488 card->drive_strength = 0;
489
490 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
491
492 drive_strength = mmc_select_drive_strength(card,
493 card->sw_caps.uhs_max_dtr,
494 card_drv_type, &drv_type);
495
496 if (drive_strength) {
497 /* if error just use default for drive strength B */
498 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
499 &card_strength);
500 if (err)
501 return;
502
503 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
504 card_strength |= host_drive_to_sdio_drive(drive_strength);
505
506 /* if error default to drive strength B */
507 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
508 card_strength, NULL);
509 if (err)
510 return;
511 card->drive_strength = drive_strength;
512 }
513
514 if (drv_type)
515 mmc_set_driver_type(card->host, drv_type);
516}
517
518
519static int sdio_set_bus_speed_mode(struct mmc_card *card)
520{
521 unsigned int bus_speed, timing;
522 int err;
523 unsigned char speed;
524 unsigned int max_rate;
525
526 /*
527 * If the host doesn't support any of the UHS-I modes, fallback on
528 * default speed.
529 */
530 if (!mmc_host_uhs(card->host))
531 return 0;
532
533 bus_speed = SDIO_SPEED_SDR12;
534 timing = MMC_TIMING_UHS_SDR12;
535 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
536 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
537 bus_speed = SDIO_SPEED_SDR104;
538 timing = MMC_TIMING_UHS_SDR104;
539 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
540 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
541 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
542 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
543 bus_speed = SDIO_SPEED_DDR50;
544 timing = MMC_TIMING_UHS_DDR50;
545 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
546 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
547 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
548 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
549 SD_MODE_UHS_SDR50)) {
550 bus_speed = SDIO_SPEED_SDR50;
551 timing = MMC_TIMING_UHS_SDR50;
552 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
553 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
554 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
555 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
556 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
557 bus_speed = SDIO_SPEED_SDR25;
558 timing = MMC_TIMING_UHS_SDR25;
559 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
560 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
561 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
562 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
563 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
564 SD_MODE_UHS_SDR12)) {
565 bus_speed = SDIO_SPEED_SDR12;
566 timing = MMC_TIMING_UHS_SDR12;
567 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
568 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
569 }
570
571 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
572 if (err)
573 return err;
574
575 speed &= ~SDIO_SPEED_BSS_MASK;
576 speed |= bus_speed;
577 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
578 if (err)
579 return err;
580
581 max_rate = min_not_zero(card->quirk_max_rate,
582 card->sw_caps.uhs_max_dtr);
583
584 mmc_set_timing(card->host, timing);
585 mmc_set_clock(card->host, max_rate);
586
587 return 0;
588}
589
590/*
591 * UHS-I specific initialization procedure
592 */
593static int mmc_sdio_init_uhs_card(struct mmc_card *card)
594{
595 int err;
596
597 if (!card->scr.sda_spec3)
598 return 0;
599
600 /* Switch to wider bus */
601 err = sdio_enable_4bit_bus(card);
602 if (err)
603 goto out;
604
605 /* Set the driver strength for the card */
606 sdio_select_driver_type(card);
607
608 /* Set bus speed mode of the card */
609 err = sdio_set_bus_speed_mode(card);
610 if (err)
611 goto out;
612
613 /*
614 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
615 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
616 */
617 if (!mmc_host_is_spi(card->host) &&
618 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
619 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
620 err = mmc_execute_tuning(card);
621out:
622 return err;
623}
624
625static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
626 struct mmc_card *card)
627{
628 if (card)
629 mmc_remove_card(card);
630
631 /*
632 * Reset the card by performing the same steps that are taken by
633 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
634 *
635 * sdio_reset() is technically not needed. Having just powered up the
636 * hardware, it should already be in reset state. However, some
637 * platforms (such as SD8686 on OLPC) do not instantly cut power,
638 * meaning that a reset is required when restoring power soon after
639 * powering off. It is harmless in other cases.
640 *
641 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
642 * is not necessary for non-removable cards. However, it is required
643 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
644 * harmless in other situations.
645 *
646 */
647
648 sdio_reset(host);
649 mmc_go_idle(host);
650 mmc_send_if_cond(host, ocr);
651 return mmc_send_io_op_cond(host, 0, NULL);
652}
653
654/*
655 * Handle the detection and initialisation of a card.
656 *
657 * In the case of a resume, "oldcard" will contain the card
658 * we're trying to reinitialise.
659 */
660static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
661 struct mmc_card *oldcard)
662{
663 struct mmc_card *card;
664 int err;
665 int retries = 10;
666 u32 rocr = 0;
667 u32 ocr_card = ocr;
668
669 WARN_ON(!host->claimed);
670
671 /* to query card if 1.8V signalling is supported */
672 if (mmc_host_uhs(host))
673 ocr |= R4_18V_PRESENT;
674
675try_again:
676 if (!retries) {
677 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
678 ocr &= ~R4_18V_PRESENT;
679 }
680
681 /*
682 * Inform the card of the voltage
683 */
684 err = mmc_send_io_op_cond(host, ocr, &rocr);
685 if (err)
686 return err;
687
688 /*
689 * For SPI, enable CRC as appropriate.
690 */
691 if (mmc_host_is_spi(host)) {
692 err = mmc_spi_set_crc(host, use_spi_crc);
693 if (err)
694 return err;
695 }
696
697 /*
698 * Allocate card structure.
699 */
700 card = mmc_alloc_card(host, &sdio_type);
701 if (IS_ERR(card))
702 return PTR_ERR(card);
703
704 if ((rocr & R4_MEMORY_PRESENT) &&
705 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
706 card->type = MMC_TYPE_SD_COMBO;
707
708 if (oldcard && (!mmc_card_sd_combo(oldcard) ||
709 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
710 err = -ENOENT;
711 goto mismatch;
712 }
713 } else {
714 card->type = MMC_TYPE_SDIO;
715
716 if (oldcard && !mmc_card_sdio(oldcard)) {
717 err = -ENOENT;
718 goto mismatch;
719 }
720 }
721
722 /*
723 * Call the optional HC's init_card function to handle quirks.
724 */
725 if (host->ops->init_card)
726 host->ops->init_card(host, card);
727 mmc_fixup_device(card, sdio_card_init_methods);
728
729 card->ocr = ocr_card;
730
731 /*
732 * If the host and card support UHS-I mode request the card
733 * to switch to 1.8V signaling level. No 1.8v signalling if
734 * UHS mode is not enabled to maintain compatibility and some
735 * systems that claim 1.8v signalling in fact do not support
736 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
737 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
738 * fails to check rocr & R4_18V_PRESENT, but we still need to
739 * try to init uhs card. sdio_read_cccr will take over this task
740 * to make sure which speed mode should work.
741 */
742 if (rocr & ocr & R4_18V_PRESENT) {
743 err = mmc_set_uhs_voltage(host, ocr_card);
744 if (err == -EAGAIN) {
745 mmc_sdio_pre_init(host, ocr_card, card);
746 retries--;
747 goto try_again;
748 } else if (err) {
749 ocr &= ~R4_18V_PRESENT;
750 }
751 }
752
753 /*
754 * For native busses: set card RCA and quit open drain mode.
755 */
756 if (!mmc_host_is_spi(host)) {
757 err = mmc_send_relative_addr(host, &card->rca);
758 if (err)
759 goto remove;
760
761 /*
762 * Update oldcard with the new RCA received from the SDIO
763 * device -- we're doing this so that it's updated in the
764 * "card" struct when oldcard overwrites that later.
765 */
766 if (oldcard)
767 oldcard->rca = card->rca;
768 }
769
770 /*
771 * Read CSD, before selecting the card
772 */
773 if (!oldcard && mmc_card_sd_combo(card)) {
774 err = mmc_sd_get_csd(card, false);
775 if (err)
776 goto remove;
777
778 mmc_decode_cid(card);
779 }
780
781 /*
782 * Select card, as all following commands rely on that.
783 */
784 if (!mmc_host_is_spi(host)) {
785 err = mmc_select_card(card);
786 if (err)
787 goto remove;
788 }
789
790 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
791 /*
792 * This is non-standard SDIO device, meaning it doesn't
793 * have any CIA (Common I/O area) registers present.
794 * It's host's responsibility to fill cccr and cis
795 * structures in init_card().
796 */
797 mmc_set_clock(host, card->cis.max_dtr);
798
799 if (card->cccr.high_speed) {
800 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
801 }
802
803 if (oldcard)
804 mmc_remove_card(card);
805 else
806 host->card = card;
807
808 return 0;
809 }
810
811 /*
812 * Read the common registers. Note that we should try to
813 * validate whether UHS would work or not.
814 */
815 err = sdio_read_cccr(card, ocr);
816 if (err) {
817 mmc_sdio_pre_init(host, ocr_card, card);
818 if (ocr & R4_18V_PRESENT) {
819 /* Retry init sequence, but without R4_18V_PRESENT. */
820 retries = 0;
821 goto try_again;
822 }
823 return err;
824 }
825
826 /*
827 * Read the common CIS tuples.
828 */
829 err = sdio_read_common_cis(card);
830 if (err)
831 goto remove;
832
833 if (oldcard) {
834 if (card->cis.vendor == oldcard->cis.vendor &&
835 card->cis.device == oldcard->cis.device) {
836 mmc_remove_card(card);
837 card = oldcard;
838 } else {
839 err = -ENOENT;
840 goto mismatch;
841 }
842 }
843
844 mmc_fixup_device(card, sdio_fixup_methods);
845
846 if (mmc_card_sd_combo(card)) {
847 err = mmc_sd_setup_card(host, card, oldcard != NULL);
848 /* handle as SDIO-only card if memory init failed */
849 if (err) {
850 mmc_go_idle(host);
851 if (mmc_host_is_spi(host))
852 /* should not fail, as it worked previously */
853 mmc_spi_set_crc(host, use_spi_crc);
854 card->type = MMC_TYPE_SDIO;
855 } else
856 card->dev.type = &sd_type;
857 }
858
859 /*
860 * If needed, disconnect card detection pull-up resistor.
861 */
862 err = sdio_disable_cd(card);
863 if (err)
864 goto remove;
865
866 /* Initialization sequence for UHS-I cards */
867 /* Only if card supports 1.8v and UHS signaling */
868 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
869 err = mmc_sdio_init_uhs_card(card);
870 if (err)
871 goto remove;
872 } else {
873 /*
874 * Switch to high-speed (if supported).
875 */
876 err = sdio_enable_hs(card);
877 if (err > 0)
878 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
879 else if (err)
880 goto remove;
881
882 /*
883 * Change to the card's maximum speed.
884 */
885 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
886
887 /*
888 * Switch to wider bus (if supported).
889 */
890 err = sdio_enable_4bit_bus(card);
891 if (err)
892 goto remove;
893 }
894
895 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
896 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
897 pr_err("%s: Host failed to negotiate down from 3.3V\n",
898 mmc_hostname(host));
899 err = -EINVAL;
900 goto remove;
901 }
902
903 host->card = card;
904 return 0;
905
906mismatch:
907 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
908remove:
909 if (oldcard != card)
910 mmc_remove_card(card);
911 return err;
912}
913
914static int mmc_sdio_reinit_card(struct mmc_host *host)
915{
916 int ret;
917
918 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
919 if (ret)
920 return ret;
921
922 return mmc_sdio_init_card(host, host->card->ocr, host->card);
923}
924
925/*
926 * Host is being removed. Free up the current card.
927 */
928static void mmc_sdio_remove(struct mmc_host *host)
929{
930 int i;
931
932 for (i = 0;i < host->card->sdio_funcs;i++) {
933 if (host->card->sdio_func[i]) {
934 sdio_remove_func(host->card->sdio_func[i]);
935 host->card->sdio_func[i] = NULL;
936 }
937 }
938
939 mmc_remove_card(host->card);
940 host->card = NULL;
941}
942
943/*
944 * Card detection - card is alive.
945 */
946static int mmc_sdio_alive(struct mmc_host *host)
947{
948 return mmc_select_card(host->card);
949}
950
951/*
952 * Card detection callback from host.
953 */
954static void mmc_sdio_detect(struct mmc_host *host)
955{
956 int err;
957
958 /* Make sure card is powered before detecting it */
959 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
960 err = pm_runtime_resume_and_get(&host->card->dev);
961 if (err < 0)
962 goto out;
963 }
964
965 mmc_claim_host(host);
966
967 /*
968 * Just check if our card has been removed.
969 */
970 err = _mmc_detect_card_removed(host);
971
972 mmc_release_host(host);
973
974 /*
975 * Tell PM core it's OK to power off the card now.
976 *
977 * The _sync variant is used in order to ensure that the card
978 * is left powered off in case an error occurred, and the card
979 * is going to be removed.
980 *
981 * Since there is no specific reason to believe a new user
982 * is about to show up at this point, the _sync variant is
983 * desirable anyway.
984 */
985 if (host->caps & MMC_CAP_POWER_OFF_CARD)
986 pm_runtime_put_sync(&host->card->dev);
987
988out:
989 if (err) {
990 mmc_sdio_remove(host);
991
992 mmc_claim_host(host);
993 mmc_detach_bus(host);
994 mmc_power_off(host);
995 mmc_release_host(host);
996 }
997}
998
999/*
1000 * SDIO pre_suspend. We need to suspend all functions separately.
1001 * Therefore all registered functions must have drivers with suspend
1002 * and resume methods. Failing that we simply remove the whole card.
1003 */
1004static int mmc_sdio_pre_suspend(struct mmc_host *host)
1005{
1006 int i;
1007
1008 for (i = 0; i < host->card->sdio_funcs; i++) {
1009 struct sdio_func *func = host->card->sdio_func[i];
1010 if (func && sdio_func_present(func) && func->dev.driver) {
1011 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1012 if (!pmops || !pmops->suspend || !pmops->resume)
1013 /* force removal of entire card in that case */
1014 goto remove;
1015 }
1016 }
1017
1018 return 0;
1019
1020remove:
1021 if (!mmc_card_is_removable(host)) {
1022 dev_warn(mmc_dev(host),
1023 "missing suspend/resume ops for non-removable SDIO card\n");
1024 /* Don't remove a non-removable card - we can't re-detect it. */
1025 return 0;
1026 }
1027
1028 /* Remove the SDIO card and let it be re-detected later on. */
1029 mmc_sdio_remove(host);
1030 mmc_claim_host(host);
1031 mmc_detach_bus(host);
1032 mmc_power_off(host);
1033 mmc_release_host(host);
1034 host->pm_flags = 0;
1035
1036 return 0;
1037}
1038
1039/*
1040 * SDIO suspend. Suspend all functions separately.
1041 */
1042static int mmc_sdio_suspend(struct mmc_host *host)
1043{
1044 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
1045
1046 /* Prevent processing of SDIO IRQs in suspended state. */
1047 mmc_card_set_suspended(host->card);
1048 cancel_work_sync(&host->sdio_irq_work);
1049
1050 mmc_claim_host(host);
1051
1052 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
1053 sdio_disable_4bit_bus(host->card);
1054
1055 if (!mmc_card_keep_power(host)) {
1056 mmc_power_off(host);
1057 } else if (host->retune_period) {
1058 mmc_retune_timer_stop(host);
1059 mmc_retune_needed(host);
1060 }
1061
1062 mmc_release_host(host);
1063
1064 return 0;
1065}
1066
1067static int mmc_sdio_resume(struct mmc_host *host)
1068{
1069 int err = 0;
1070
1071 /* Basic card reinitialization. */
1072 mmc_claim_host(host);
1073
1074 /*
1075 * Restore power and reinitialize the card when needed. Note that a
1076 * removable card is checked from a detect work later on in the resume
1077 * process.
1078 */
1079 if (!mmc_card_keep_power(host)) {
1080 mmc_power_up(host, host->card->ocr);
1081 /*
1082 * Tell runtime PM core we just powered up the card,
1083 * since it still believes the card is powered off.
1084 * Note that currently runtime PM is only enabled
1085 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1086 */
1087 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1088 pm_runtime_disable(&host->card->dev);
1089 pm_runtime_set_active(&host->card->dev);
1090 pm_runtime_enable(&host->card->dev);
1091 }
1092 err = mmc_sdio_reinit_card(host);
1093 } else if (mmc_card_wake_sdio_irq(host)) {
1094 /*
1095 * We may have switched to 1-bit mode during suspend,
1096 * need to hold retuning, because tuning only supprt
1097 * 4-bit mode or 8 bit mode.
1098 */
1099 mmc_retune_hold_now(host);
1100 err = sdio_enable_4bit_bus(host->card);
1101 mmc_retune_release(host);
1102 }
1103
1104 if (err)
1105 goto out;
1106
1107 /* Allow SDIO IRQs to be processed again. */
1108 mmc_card_clr_suspended(host->card);
1109
1110 if (host->sdio_irqs) {
1111 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1112 wake_up_process(host->sdio_irq_thread);
1113 else if (host->caps & MMC_CAP_SDIO_IRQ)
1114 schedule_work(&host->sdio_irq_work);
1115 }
1116
1117out:
1118 mmc_release_host(host);
1119
1120 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1121 return err;
1122}
1123
1124static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1125{
1126 /* No references to the card, cut the power to it. */
1127 mmc_claim_host(host);
1128 mmc_power_off(host);
1129 mmc_release_host(host);
1130
1131 return 0;
1132}
1133
1134static int mmc_sdio_runtime_resume(struct mmc_host *host)
1135{
1136 int ret;
1137
1138 /* Restore power and re-initialize. */
1139 mmc_claim_host(host);
1140 mmc_power_up(host, host->card->ocr);
1141 ret = mmc_sdio_reinit_card(host);
1142 mmc_release_host(host);
1143
1144 return ret;
1145}
1146
1147/*
1148 * SDIO HW reset
1149 *
1150 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1151 * reset was asynchronously scheduled, else a negative error code.
1152 */
1153static int mmc_sdio_hw_reset(struct mmc_host *host)
1154{
1155 struct mmc_card *card = host->card;
1156
1157 /*
1158 * In case the card is shared among multiple func drivers, reset the
1159 * card through a rescan work. In this way it will be removed and
1160 * re-detected, thus all func drivers becomes informed about it.
1161 */
1162 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1163 if (mmc_card_removed(card))
1164 return 1;
1165 host->rescan_entered = 0;
1166 mmc_card_set_removed(card);
1167 _mmc_detect_change(host, 0, false);
1168 return 1;
1169 }
1170
1171 /*
1172 * A single func driver has been probed, then let's skip the heavy
1173 * hotplug dance above and execute the reset immediately.
1174 */
1175 mmc_power_cycle(host, card->ocr);
1176 return mmc_sdio_reinit_card(host);
1177}
1178
1179static int mmc_sdio_sw_reset(struct mmc_host *host)
1180{
1181 mmc_set_clock(host, host->f_init);
1182 sdio_reset(host);
1183 mmc_go_idle(host);
1184
1185 mmc_set_initial_state(host);
1186 mmc_set_initial_signal_voltage(host);
1187
1188 return mmc_sdio_reinit_card(host);
1189}
1190
1191static const struct mmc_bus_ops mmc_sdio_ops = {
1192 .remove = mmc_sdio_remove,
1193 .detect = mmc_sdio_detect,
1194 .pre_suspend = mmc_sdio_pre_suspend,
1195 .suspend = mmc_sdio_suspend,
1196 .resume = mmc_sdio_resume,
1197 .runtime_suspend = mmc_sdio_runtime_suspend,
1198 .runtime_resume = mmc_sdio_runtime_resume,
1199 .alive = mmc_sdio_alive,
1200 .hw_reset = mmc_sdio_hw_reset,
1201 .sw_reset = mmc_sdio_sw_reset,
1202};
1203
1204
1205/*
1206 * Starting point for SDIO card init.
1207 */
1208int mmc_attach_sdio(struct mmc_host *host)
1209{
1210 int err, i, funcs;
1211 u32 ocr, rocr;
1212 struct mmc_card *card;
1213
1214 WARN_ON(!host->claimed);
1215
1216 err = mmc_send_io_op_cond(host, 0, &ocr);
1217 if (err)
1218 return err;
1219
1220 mmc_attach_bus(host, &mmc_sdio_ops);
1221 if (host->ocr_avail_sdio)
1222 host->ocr_avail = host->ocr_avail_sdio;
1223
1224
1225 rocr = mmc_select_voltage(host, ocr);
1226
1227 /*
1228 * Can we support the voltage(s) of the card(s)?
1229 */
1230 if (!rocr) {
1231 err = -EINVAL;
1232 goto err;
1233 }
1234
1235 /*
1236 * Detect and init the card.
1237 */
1238 err = mmc_sdio_init_card(host, rocr, NULL);
1239 if (err)
1240 goto err;
1241
1242 card = host->card;
1243
1244 /*
1245 * Enable runtime PM only if supported by host+card+board
1246 */
1247 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1248 /*
1249 * Do not allow runtime suspend until after SDIO function
1250 * devices are added.
1251 */
1252 pm_runtime_get_noresume(&card->dev);
1253
1254 /*
1255 * Let runtime PM core know our card is active
1256 */
1257 err = pm_runtime_set_active(&card->dev);
1258 if (err)
1259 goto remove;
1260
1261 /*
1262 * Enable runtime PM for this card
1263 */
1264 pm_runtime_enable(&card->dev);
1265 }
1266
1267 /*
1268 * The number of functions on the card is encoded inside
1269 * the ocr.
1270 */
1271 funcs = (ocr & 0x70000000) >> 28;
1272 card->sdio_funcs = 0;
1273
1274 /*
1275 * Initialize (but don't add) all present functions.
1276 */
1277 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1278 err = sdio_init_func(host->card, i + 1);
1279 if (err)
1280 goto remove;
1281
1282 /*
1283 * Enable Runtime PM for this func (if supported)
1284 */
1285 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1286 pm_runtime_enable(&card->sdio_func[i]->dev);
1287 }
1288
1289 /*
1290 * First add the card to the driver model...
1291 */
1292 mmc_release_host(host);
1293 err = mmc_add_card(host->card);
1294 if (err)
1295 goto remove_added;
1296
1297 /*
1298 * ...then the SDIO functions.
1299 */
1300 for (i = 0;i < funcs;i++) {
1301 err = sdio_add_func(host->card->sdio_func[i]);
1302 if (err)
1303 goto remove_added;
1304 }
1305
1306 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1307 pm_runtime_put(&card->dev);
1308
1309 mmc_claim_host(host);
1310 return 0;
1311
1312
1313remove:
1314 mmc_release_host(host);
1315remove_added:
1316 /*
1317 * The devices are being deleted so it is not necessary to disable
1318 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1319 * because it needs to be active to remove any function devices that
1320 * were probed, and after that it gets deleted.
1321 */
1322 mmc_sdio_remove(host);
1323 mmc_claim_host(host);
1324err:
1325 mmc_detach_bus(host);
1326
1327 pr_err("%s: error %d whilst initialising SDIO card\n",
1328 mmc_hostname(host), err);
1329
1330 return err;
1331}
1332