Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/mmc/sdio.c
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8#include <linux/err.h>
9#include <linux/pm_runtime.h>
10
11#include <linux/mmc/host.h>
12#include <linux/mmc/card.h>
13#include <linux/mmc/mmc.h>
14#include <linux/mmc/sdio.h>
15#include <linux/mmc/sdio_func.h>
16#include <linux/mmc/sdio_ids.h>
17
18#include "core.h"
19#include "card.h"
20#include "host.h"
21#include "bus.h"
22#include "quirks.h"
23#include "sd.h"
24#include "sdio_bus.h"
25#include "mmc_ops.h"
26#include "sd_ops.h"
27#include "sdio_ops.h"
28#include "sdio_cis.h"
29
30MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
31MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
32MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
33MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
34
35static struct attribute *sdio_std_attrs[] = {
36 &dev_attr_vendor.attr,
37 &dev_attr_device.attr,
38 &dev_attr_ocr.attr,
39 &dev_attr_rca.attr,
40 NULL,
41};
42ATTRIBUTE_GROUPS(sdio_std);
43
44static struct device_type sdio_type = {
45 .groups = sdio_std_groups,
46};
47
48static int sdio_read_fbr(struct sdio_func *func)
49{
50 int ret;
51 unsigned char data;
52
53 if (mmc_card_nonstd_func_interface(func->card)) {
54 func->class = SDIO_CLASS_NONE;
55 return 0;
56 }
57
58 ret = mmc_io_rw_direct(func->card, 0, 0,
59 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
60 if (ret)
61 goto out;
62
63 data &= 0x0f;
64
65 if (data == 0x0f) {
66 ret = mmc_io_rw_direct(func->card, 0, 0,
67 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
68 if (ret)
69 goto out;
70 }
71
72 func->class = data;
73
74out:
75 return ret;
76}
77
78static int sdio_init_func(struct mmc_card *card, unsigned int fn)
79{
80 int ret;
81 struct sdio_func *func;
82
83 if (WARN_ON(fn > SDIO_MAX_FUNCS))
84 return -EINVAL;
85
86 func = sdio_alloc_func(card);
87 if (IS_ERR(func))
88 return PTR_ERR(func);
89
90 func->num = fn;
91
92 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
93 ret = sdio_read_fbr(func);
94 if (ret)
95 goto fail;
96
97 ret = sdio_read_func_cis(func);
98 if (ret)
99 goto fail;
100 } else {
101 func->vendor = func->card->cis.vendor;
102 func->device = func->card->cis.device;
103 func->max_blksize = func->card->cis.blksize;
104 }
105
106 card->sdio_func[fn - 1] = func;
107
108 return 0;
109
110fail:
111 /*
112 * It is okay to remove the function here even though we hold
113 * the host lock as we haven't registered the device yet.
114 */
115 sdio_remove_func(func);
116 return ret;
117}
118
119static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
120{
121 int ret;
122 int cccr_vsn;
123 int uhs = ocr & R4_18V_PRESENT;
124 unsigned char data;
125 unsigned char speed;
126
127 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
128 if (ret)
129 goto out;
130
131 cccr_vsn = data & 0x0f;
132
133 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
134 pr_err("%s: unrecognised CCCR structure version %d\n",
135 mmc_hostname(card->host), cccr_vsn);
136 return -EINVAL;
137 }
138
139 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
140
141 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
142 if (ret)
143 goto out;
144
145 if (data & SDIO_CCCR_CAP_SMB)
146 card->cccr.multi_block = 1;
147 if (data & SDIO_CCCR_CAP_LSC)
148 card->cccr.low_speed = 1;
149 if (data & SDIO_CCCR_CAP_4BLS)
150 card->cccr.wide_bus = 1;
151
152 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
153 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
154 if (ret)
155 goto out;
156
157 if (data & SDIO_POWER_SMPC)
158 card->cccr.high_power = 1;
159 }
160
161 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
162 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
163 if (ret)
164 goto out;
165
166 card->scr.sda_spec3 = 0;
167 card->sw_caps.sd3_bus_mode = 0;
168 card->sw_caps.sd3_drv_type = 0;
169 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
170 card->scr.sda_spec3 = 1;
171 ret = mmc_io_rw_direct(card, 0, 0,
172 SDIO_CCCR_UHS, 0, &data);
173 if (ret)
174 goto out;
175
176 if (mmc_host_uhs(card->host)) {
177 if (data & SDIO_UHS_DDR50)
178 card->sw_caps.sd3_bus_mode
179 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
180 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
181
182 if (data & SDIO_UHS_SDR50)
183 card->sw_caps.sd3_bus_mode
184 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
185 | SD_MODE_UHS_SDR12;
186
187 if (data & SDIO_UHS_SDR104)
188 card->sw_caps.sd3_bus_mode
189 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
190 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
191 }
192
193 ret = mmc_io_rw_direct(card, 0, 0,
194 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
195 if (ret)
196 goto out;
197
198 if (data & SDIO_DRIVE_SDTA)
199 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
200 if (data & SDIO_DRIVE_SDTC)
201 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
202 if (data & SDIO_DRIVE_SDTD)
203 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
204 }
205
206 /* if no uhs mode ensure we check for high speed */
207 if (!card->sw_caps.sd3_bus_mode) {
208 if (speed & SDIO_SPEED_SHS) {
209 card->cccr.high_speed = 1;
210 card->sw_caps.hs_max_dtr = 50000000;
211 } else {
212 card->cccr.high_speed = 0;
213 card->sw_caps.hs_max_dtr = 25000000;
214 }
215 }
216 }
217
218out:
219 return ret;
220}
221
222static int sdio_enable_wide(struct mmc_card *card)
223{
224 int ret;
225 u8 ctrl;
226
227 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
228 return 0;
229
230 if (card->cccr.low_speed && !card->cccr.wide_bus)
231 return 0;
232
233 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
234 if (ret)
235 return ret;
236
237 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
238 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
239 mmc_hostname(card->host), ctrl);
240
241 /* set as 4-bit bus width */
242 ctrl &= ~SDIO_BUS_WIDTH_MASK;
243 ctrl |= SDIO_BUS_WIDTH_4BIT;
244
245 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
246 if (ret)
247 return ret;
248
249 return 1;
250}
251
252/*
253 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
254 * of the card. This may be required on certain setups of boards,
255 * controllers and embedded sdio device which do not need the card's
256 * pull-up. As a result, card detection is disabled and power is saved.
257 */
258static int sdio_disable_cd(struct mmc_card *card)
259{
260 int ret;
261 u8 ctrl;
262
263 if (!mmc_card_disable_cd(card))
264 return 0;
265
266 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
267 if (ret)
268 return ret;
269
270 ctrl |= SDIO_BUS_CD_DISABLE;
271
272 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
273}
274
275/*
276 * Devices that remain active during a system suspend are
277 * put back into 1-bit mode.
278 */
279static int sdio_disable_wide(struct mmc_card *card)
280{
281 int ret;
282 u8 ctrl;
283
284 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
285 return 0;
286
287 if (card->cccr.low_speed && !card->cccr.wide_bus)
288 return 0;
289
290 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
291 if (ret)
292 return ret;
293
294 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
295 return 0;
296
297 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
298 ctrl |= SDIO_BUS_ASYNC_INT;
299
300 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
301 if (ret)
302 return ret;
303
304 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
305
306 return 0;
307}
308
309static int sdio_disable_4bit_bus(struct mmc_card *card)
310{
311 int err;
312
313 if (card->type == MMC_TYPE_SDIO)
314 goto out;
315
316 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
317 return 0;
318
319 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
320 return 0;
321
322 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
323 if (err)
324 return err;
325
326out:
327 return sdio_disable_wide(card);
328}
329
330
331static int sdio_enable_4bit_bus(struct mmc_card *card)
332{
333 int err;
334
335 err = sdio_enable_wide(card);
336 if (err <= 0)
337 return err;
338 if (card->type == MMC_TYPE_SDIO)
339 goto out;
340
341 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
342 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
343 if (err) {
344 sdio_disable_wide(card);
345 return err;
346 }
347 }
348out:
349 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
350
351 return 0;
352}
353
354
355/*
356 * Test if the card supports high-speed mode and, if so, switch to it.
357 */
358static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
359{
360 int ret;
361 u8 speed;
362
363 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
364 return 0;
365
366 if (!card->cccr.high_speed)
367 return 0;
368
369 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
370 if (ret)
371 return ret;
372
373 if (enable)
374 speed |= SDIO_SPEED_EHS;
375 else
376 speed &= ~SDIO_SPEED_EHS;
377
378 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
379 if (ret)
380 return ret;
381
382 return 1;
383}
384
385/*
386 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
387 */
388static int sdio_enable_hs(struct mmc_card *card)
389{
390 int ret;
391
392 ret = mmc_sdio_switch_hs(card, true);
393 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
394 return ret;
395
396 ret = mmc_sd_switch_hs(card);
397 if (ret <= 0)
398 mmc_sdio_switch_hs(card, false);
399
400 return ret;
401}
402
403static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
404{
405 unsigned max_dtr;
406
407 if (mmc_card_hs(card)) {
408 /*
409 * The SDIO specification doesn't mention how
410 * the CIS transfer speed register relates to
411 * high-speed, but it seems that 50 MHz is
412 * mandatory.
413 */
414 max_dtr = 50000000;
415 } else {
416 max_dtr = card->cis.max_dtr;
417 }
418
419 if (card->type == MMC_TYPE_SD_COMBO)
420 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
421
422 return max_dtr;
423}
424
425static unsigned char host_drive_to_sdio_drive(int host_strength)
426{
427 switch (host_strength) {
428 case MMC_SET_DRIVER_TYPE_A:
429 return SDIO_DTSx_SET_TYPE_A;
430 case MMC_SET_DRIVER_TYPE_B:
431 return SDIO_DTSx_SET_TYPE_B;
432 case MMC_SET_DRIVER_TYPE_C:
433 return SDIO_DTSx_SET_TYPE_C;
434 case MMC_SET_DRIVER_TYPE_D:
435 return SDIO_DTSx_SET_TYPE_D;
436 default:
437 return SDIO_DTSx_SET_TYPE_B;
438 }
439}
440
441static void sdio_select_driver_type(struct mmc_card *card)
442{
443 int card_drv_type, drive_strength, drv_type;
444 unsigned char card_strength;
445 int err;
446
447 card->drive_strength = 0;
448
449 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
450
451 drive_strength = mmc_select_drive_strength(card,
452 card->sw_caps.uhs_max_dtr,
453 card_drv_type, &drv_type);
454
455 if (drive_strength) {
456 /* if error just use default for drive strength B */
457 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
458 &card_strength);
459 if (err)
460 return;
461
462 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
463 card_strength |= host_drive_to_sdio_drive(drive_strength);
464
465 /* if error default to drive strength B */
466 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
467 card_strength, NULL);
468 if (err)
469 return;
470 card->drive_strength = drive_strength;
471 }
472
473 if (drv_type)
474 mmc_set_driver_type(card->host, drv_type);
475}
476
477
478static int sdio_set_bus_speed_mode(struct mmc_card *card)
479{
480 unsigned int bus_speed, timing;
481 int err;
482 unsigned char speed;
483 unsigned int max_rate;
484
485 /*
486 * If the host doesn't support any of the UHS-I modes, fallback on
487 * default speed.
488 */
489 if (!mmc_host_uhs(card->host))
490 return 0;
491
492 bus_speed = SDIO_SPEED_SDR12;
493 timing = MMC_TIMING_UHS_SDR12;
494 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
495 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
496 bus_speed = SDIO_SPEED_SDR104;
497 timing = MMC_TIMING_UHS_SDR104;
498 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
499 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
500 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
501 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
502 bus_speed = SDIO_SPEED_DDR50;
503 timing = MMC_TIMING_UHS_DDR50;
504 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
505 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
506 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
507 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
508 SD_MODE_UHS_SDR50)) {
509 bus_speed = SDIO_SPEED_SDR50;
510 timing = MMC_TIMING_UHS_SDR50;
511 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
512 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
513 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
514 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
515 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
516 bus_speed = SDIO_SPEED_SDR25;
517 timing = MMC_TIMING_UHS_SDR25;
518 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
519 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
520 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
521 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
522 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
523 SD_MODE_UHS_SDR12)) {
524 bus_speed = SDIO_SPEED_SDR12;
525 timing = MMC_TIMING_UHS_SDR12;
526 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
527 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
528 }
529
530 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
531 if (err)
532 return err;
533
534 speed &= ~SDIO_SPEED_BSS_MASK;
535 speed |= bus_speed;
536 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
537 if (err)
538 return err;
539
540 max_rate = min_not_zero(card->quirk_max_rate,
541 card->sw_caps.uhs_max_dtr);
542
543 mmc_set_timing(card->host, timing);
544 mmc_set_clock(card->host, max_rate);
545
546 return 0;
547}
548
549/*
550 * UHS-I specific initialization procedure
551 */
552static int mmc_sdio_init_uhs_card(struct mmc_card *card)
553{
554 int err;
555
556 if (!card->scr.sda_spec3)
557 return 0;
558
559 /* Switch to wider bus */
560 err = sdio_enable_4bit_bus(card);
561 if (err)
562 goto out;
563
564 /* Set the driver strength for the card */
565 sdio_select_driver_type(card);
566
567 /* Set bus speed mode of the card */
568 err = sdio_set_bus_speed_mode(card);
569 if (err)
570 goto out;
571
572 /*
573 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
574 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
575 */
576 if (!mmc_host_is_spi(card->host) &&
577 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
578 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
579 err = mmc_execute_tuning(card);
580out:
581 return err;
582}
583
584static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
585 struct mmc_card *card)
586{
587 if (card)
588 mmc_remove_card(card);
589
590 /*
591 * Reset the card by performing the same steps that are taken by
592 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
593 *
594 * sdio_reset() is technically not needed. Having just powered up the
595 * hardware, it should already be in reset state. However, some
596 * platforms (such as SD8686 on OLPC) do not instantly cut power,
597 * meaning that a reset is required when restoring power soon after
598 * powering off. It is harmless in other cases.
599 *
600 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
601 * is not necessary for non-removable cards. However, it is required
602 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
603 * harmless in other situations.
604 *
605 */
606
607 sdio_reset(host);
608 mmc_go_idle(host);
609 mmc_send_if_cond(host, ocr);
610 return mmc_send_io_op_cond(host, 0, NULL);
611}
612
613/*
614 * Handle the detection and initialisation of a card.
615 *
616 * In the case of a resume, "oldcard" will contain the card
617 * we're trying to reinitialise.
618 */
619static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
620 struct mmc_card *oldcard)
621{
622 struct mmc_card *card;
623 int err;
624 int retries = 10;
625 u32 rocr = 0;
626 u32 ocr_card = ocr;
627
628 WARN_ON(!host->claimed);
629
630 /* to query card if 1.8V signalling is supported */
631 if (mmc_host_uhs(host))
632 ocr |= R4_18V_PRESENT;
633
634try_again:
635 if (!retries) {
636 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
637 ocr &= ~R4_18V_PRESENT;
638 }
639
640 /*
641 * Inform the card of the voltage
642 */
643 err = mmc_send_io_op_cond(host, ocr, &rocr);
644 if (err)
645 return err;
646
647 /*
648 * For SPI, enable CRC as appropriate.
649 */
650 if (mmc_host_is_spi(host)) {
651 err = mmc_spi_set_crc(host, use_spi_crc);
652 if (err)
653 return err;
654 }
655
656 /*
657 * Allocate card structure.
658 */
659 card = mmc_alloc_card(host, &sdio_type);
660 if (IS_ERR(card))
661 return PTR_ERR(card);
662
663 if ((rocr & R4_MEMORY_PRESENT) &&
664 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
665 card->type = MMC_TYPE_SD_COMBO;
666
667 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
668 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
669 err = -ENOENT;
670 goto mismatch;
671 }
672 } else {
673 card->type = MMC_TYPE_SDIO;
674
675 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
676 err = -ENOENT;
677 goto mismatch;
678 }
679 }
680
681 /*
682 * Call the optional HC's init_card function to handle quirks.
683 */
684 if (host->ops->init_card)
685 host->ops->init_card(host, card);
686
687 /*
688 * If the host and card support UHS-I mode request the card
689 * to switch to 1.8V signaling level. No 1.8v signalling if
690 * UHS mode is not enabled to maintain compatibility and some
691 * systems that claim 1.8v signalling in fact do not support
692 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
693 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
694 * fails to check rocr & R4_18V_PRESENT, but we still need to
695 * try to init uhs card. sdio_read_cccr will take over this task
696 * to make sure which speed mode should work.
697 */
698 if (rocr & ocr & R4_18V_PRESENT) {
699 err = mmc_set_uhs_voltage(host, ocr_card);
700 if (err == -EAGAIN) {
701 mmc_sdio_pre_init(host, ocr_card, card);
702 retries--;
703 goto try_again;
704 } else if (err) {
705 ocr &= ~R4_18V_PRESENT;
706 }
707 }
708
709 /*
710 * For native busses: set card RCA and quit open drain mode.
711 */
712 if (!mmc_host_is_spi(host)) {
713 err = mmc_send_relative_addr(host, &card->rca);
714 if (err)
715 goto remove;
716
717 /*
718 * Update oldcard with the new RCA received from the SDIO
719 * device -- we're doing this so that it's updated in the
720 * "card" struct when oldcard overwrites that later.
721 */
722 if (oldcard)
723 oldcard->rca = card->rca;
724 }
725
726 /*
727 * Read CSD, before selecting the card
728 */
729 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
730 err = mmc_sd_get_csd(host, card);
731 if (err)
732 goto remove;
733
734 mmc_decode_cid(card);
735 }
736
737 /*
738 * Select card, as all following commands rely on that.
739 */
740 if (!mmc_host_is_spi(host)) {
741 err = mmc_select_card(card);
742 if (err)
743 goto remove;
744 }
745
746 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
747 /*
748 * This is non-standard SDIO device, meaning it doesn't
749 * have any CIA (Common I/O area) registers present.
750 * It's host's responsibility to fill cccr and cis
751 * structures in init_card().
752 */
753 mmc_set_clock(host, card->cis.max_dtr);
754
755 if (card->cccr.high_speed) {
756 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
757 }
758
759 if (oldcard)
760 mmc_remove_card(card);
761 else
762 host->card = card;
763
764 return 0;
765 }
766
767 /*
768 * Read the common registers. Note that we should try to
769 * validate whether UHS would work or not.
770 */
771 err = sdio_read_cccr(card, ocr);
772 if (err) {
773 mmc_sdio_pre_init(host, ocr_card, card);
774 if (ocr & R4_18V_PRESENT) {
775 /* Retry init sequence, but without R4_18V_PRESENT. */
776 retries = 0;
777 goto try_again;
778 }
779 return err;
780 }
781
782 /*
783 * Read the common CIS tuples.
784 */
785 err = sdio_read_common_cis(card);
786 if (err)
787 goto remove;
788
789 if (oldcard) {
790 if (card->cis.vendor == oldcard->cis.vendor &&
791 card->cis.device == oldcard->cis.device) {
792 mmc_remove_card(card);
793 card = oldcard;
794 } else {
795 err = -ENOENT;
796 goto mismatch;
797 }
798 }
799 card->ocr = ocr_card;
800 mmc_fixup_device(card, sdio_fixup_methods);
801
802 if (card->type == MMC_TYPE_SD_COMBO) {
803 err = mmc_sd_setup_card(host, card, oldcard != NULL);
804 /* handle as SDIO-only card if memory init failed */
805 if (err) {
806 mmc_go_idle(host);
807 if (mmc_host_is_spi(host))
808 /* should not fail, as it worked previously */
809 mmc_spi_set_crc(host, use_spi_crc);
810 card->type = MMC_TYPE_SDIO;
811 } else
812 card->dev.type = &sd_type;
813 }
814
815 /*
816 * If needed, disconnect card detection pull-up resistor.
817 */
818 err = sdio_disable_cd(card);
819 if (err)
820 goto remove;
821
822 /* Initialization sequence for UHS-I cards */
823 /* Only if card supports 1.8v and UHS signaling */
824 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
825 err = mmc_sdio_init_uhs_card(card);
826 if (err)
827 goto remove;
828 } else {
829 /*
830 * Switch to high-speed (if supported).
831 */
832 err = sdio_enable_hs(card);
833 if (err > 0)
834 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
835 else if (err)
836 goto remove;
837
838 /*
839 * Change to the card's maximum speed.
840 */
841 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
842
843 /*
844 * Switch to wider bus (if supported).
845 */
846 err = sdio_enable_4bit_bus(card);
847 if (err)
848 goto remove;
849 }
850
851 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
852 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
853 pr_err("%s: Host failed to negotiate down from 3.3V\n",
854 mmc_hostname(host));
855 err = -EINVAL;
856 goto remove;
857 }
858
859 host->card = card;
860 return 0;
861
862mismatch:
863 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
864remove:
865 if (oldcard != card)
866 mmc_remove_card(card);
867 return err;
868}
869
870static int mmc_sdio_reinit_card(struct mmc_host *host)
871{
872 int ret;
873
874 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
875 if (ret)
876 return ret;
877
878 return mmc_sdio_init_card(host, host->card->ocr, host->card);
879}
880
881/*
882 * Host is being removed. Free up the current card.
883 */
884static void mmc_sdio_remove(struct mmc_host *host)
885{
886 int i;
887
888 for (i = 0;i < host->card->sdio_funcs;i++) {
889 if (host->card->sdio_func[i]) {
890 sdio_remove_func(host->card->sdio_func[i]);
891 host->card->sdio_func[i] = NULL;
892 }
893 }
894
895 mmc_remove_card(host->card);
896 host->card = NULL;
897}
898
899/*
900 * Card detection - card is alive.
901 */
902static int mmc_sdio_alive(struct mmc_host *host)
903{
904 return mmc_select_card(host->card);
905}
906
907/*
908 * Card detection callback from host.
909 */
910static void mmc_sdio_detect(struct mmc_host *host)
911{
912 int err;
913
914 /* Make sure card is powered before detecting it */
915 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
916 err = pm_runtime_get_sync(&host->card->dev);
917 if (err < 0) {
918 pm_runtime_put_noidle(&host->card->dev);
919 goto out;
920 }
921 }
922
923 mmc_claim_host(host);
924
925 /*
926 * Just check if our card has been removed.
927 */
928 err = _mmc_detect_card_removed(host);
929
930 mmc_release_host(host);
931
932 /*
933 * Tell PM core it's OK to power off the card now.
934 *
935 * The _sync variant is used in order to ensure that the card
936 * is left powered off in case an error occurred, and the card
937 * is going to be removed.
938 *
939 * Since there is no specific reason to believe a new user
940 * is about to show up at this point, the _sync variant is
941 * desirable anyway.
942 */
943 if (host->caps & MMC_CAP_POWER_OFF_CARD)
944 pm_runtime_put_sync(&host->card->dev);
945
946out:
947 if (err) {
948 mmc_sdio_remove(host);
949
950 mmc_claim_host(host);
951 mmc_detach_bus(host);
952 mmc_power_off(host);
953 mmc_release_host(host);
954 }
955}
956
957/*
958 * SDIO pre_suspend. We need to suspend all functions separately.
959 * Therefore all registered functions must have drivers with suspend
960 * and resume methods. Failing that we simply remove the whole card.
961 */
962static int mmc_sdio_pre_suspend(struct mmc_host *host)
963{
964 int i, err = 0;
965
966 for (i = 0; i < host->card->sdio_funcs; i++) {
967 struct sdio_func *func = host->card->sdio_func[i];
968 if (func && sdio_func_present(func) && func->dev.driver) {
969 const struct dev_pm_ops *pmops = func->dev.driver->pm;
970 if (!pmops || !pmops->suspend || !pmops->resume) {
971 /* force removal of entire card in that case */
972 err = -ENOSYS;
973 break;
974 }
975 }
976 }
977
978 return err;
979}
980
981/*
982 * SDIO suspend. Suspend all functions separately.
983 */
984static int mmc_sdio_suspend(struct mmc_host *host)
985{
986 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
987
988 /* Prevent processing of SDIO IRQs in suspended state. */
989 mmc_card_set_suspended(host->card);
990 cancel_delayed_work_sync(&host->sdio_irq_work);
991
992 mmc_claim_host(host);
993
994 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
995 sdio_disable_4bit_bus(host->card);
996
997 if (!mmc_card_keep_power(host)) {
998 mmc_power_off(host);
999 } else if (host->retune_period) {
1000 mmc_retune_timer_stop(host);
1001 mmc_retune_needed(host);
1002 }
1003
1004 mmc_release_host(host);
1005
1006 return 0;
1007}
1008
1009static int mmc_sdio_resume(struct mmc_host *host)
1010{
1011 int err = 0;
1012
1013 /* Basic card reinitialization. */
1014 mmc_claim_host(host);
1015
1016 /*
1017 * Restore power and reinitialize the card when needed. Note that a
1018 * removable card is checked from a detect work later on in the resume
1019 * process.
1020 */
1021 if (!mmc_card_keep_power(host)) {
1022 mmc_power_up(host, host->card->ocr);
1023 /*
1024 * Tell runtime PM core we just powered up the card,
1025 * since it still believes the card is powered off.
1026 * Note that currently runtime PM is only enabled
1027 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1028 */
1029 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1030 pm_runtime_disable(&host->card->dev);
1031 pm_runtime_set_active(&host->card->dev);
1032 pm_runtime_enable(&host->card->dev);
1033 }
1034 err = mmc_sdio_reinit_card(host);
1035 } else if (mmc_card_wake_sdio_irq(host)) {
1036 /* We may have switched to 1-bit mode during suspend */
1037 err = sdio_enable_4bit_bus(host->card);
1038 }
1039
1040 if (err)
1041 goto out;
1042
1043 /* Allow SDIO IRQs to be processed again. */
1044 mmc_card_clr_suspended(host->card);
1045
1046 if (host->sdio_irqs) {
1047 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1048 wake_up_process(host->sdio_irq_thread);
1049 else if (host->caps & MMC_CAP_SDIO_IRQ)
1050 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1051 }
1052
1053out:
1054 mmc_release_host(host);
1055
1056 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1057 return err;
1058}
1059
1060static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1061{
1062 /* No references to the card, cut the power to it. */
1063 mmc_claim_host(host);
1064 mmc_power_off(host);
1065 mmc_release_host(host);
1066
1067 return 0;
1068}
1069
1070static int mmc_sdio_runtime_resume(struct mmc_host *host)
1071{
1072 int ret;
1073
1074 /* Restore power and re-initialize. */
1075 mmc_claim_host(host);
1076 mmc_power_up(host, host->card->ocr);
1077 ret = mmc_sdio_reinit_card(host);
1078 mmc_release_host(host);
1079
1080 return ret;
1081}
1082
1083/*
1084 * SDIO HW reset
1085 *
1086 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1087 * reset was asynchronously scheduled, else a negative error code.
1088 */
1089static int mmc_sdio_hw_reset(struct mmc_host *host)
1090{
1091 struct mmc_card *card = host->card;
1092
1093 /*
1094 * In case the card is shared among multiple func drivers, reset the
1095 * card through a rescan work. In this way it will be removed and
1096 * re-detected, thus all func drivers becomes informed about it.
1097 */
1098 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1099 if (mmc_card_removed(card))
1100 return 1;
1101 host->rescan_entered = 0;
1102 mmc_card_set_removed(card);
1103 _mmc_detect_change(host, 0, false);
1104 return 1;
1105 }
1106
1107 /*
1108 * A single func driver has been probed, then let's skip the heavy
1109 * hotplug dance above and execute the reset immediately.
1110 */
1111 mmc_power_cycle(host, card->ocr);
1112 return mmc_sdio_reinit_card(host);
1113}
1114
1115static int mmc_sdio_sw_reset(struct mmc_host *host)
1116{
1117 mmc_set_clock(host, host->f_init);
1118 sdio_reset(host);
1119 mmc_go_idle(host);
1120
1121 mmc_set_initial_state(host);
1122 mmc_set_initial_signal_voltage(host);
1123
1124 return mmc_sdio_reinit_card(host);
1125}
1126
1127static const struct mmc_bus_ops mmc_sdio_ops = {
1128 .remove = mmc_sdio_remove,
1129 .detect = mmc_sdio_detect,
1130 .pre_suspend = mmc_sdio_pre_suspend,
1131 .suspend = mmc_sdio_suspend,
1132 .resume = mmc_sdio_resume,
1133 .runtime_suspend = mmc_sdio_runtime_suspend,
1134 .runtime_resume = mmc_sdio_runtime_resume,
1135 .alive = mmc_sdio_alive,
1136 .hw_reset = mmc_sdio_hw_reset,
1137 .sw_reset = mmc_sdio_sw_reset,
1138};
1139
1140
1141/*
1142 * Starting point for SDIO card init.
1143 */
1144int mmc_attach_sdio(struct mmc_host *host)
1145{
1146 int err, i, funcs;
1147 u32 ocr, rocr;
1148 struct mmc_card *card;
1149
1150 WARN_ON(!host->claimed);
1151
1152 err = mmc_send_io_op_cond(host, 0, &ocr);
1153 if (err)
1154 return err;
1155
1156 mmc_attach_bus(host, &mmc_sdio_ops);
1157 if (host->ocr_avail_sdio)
1158 host->ocr_avail = host->ocr_avail_sdio;
1159
1160
1161 rocr = mmc_select_voltage(host, ocr);
1162
1163 /*
1164 * Can we support the voltage(s) of the card(s)?
1165 */
1166 if (!rocr) {
1167 err = -EINVAL;
1168 goto err;
1169 }
1170
1171 /*
1172 * Detect and init the card.
1173 */
1174 err = mmc_sdio_init_card(host, rocr, NULL);
1175 if (err)
1176 goto err;
1177
1178 card = host->card;
1179
1180 /*
1181 * Enable runtime PM only if supported by host+card+board
1182 */
1183 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1184 /*
1185 * Do not allow runtime suspend until after SDIO function
1186 * devices are added.
1187 */
1188 pm_runtime_get_noresume(&card->dev);
1189
1190 /*
1191 * Let runtime PM core know our card is active
1192 */
1193 err = pm_runtime_set_active(&card->dev);
1194 if (err)
1195 goto remove;
1196
1197 /*
1198 * Enable runtime PM for this card
1199 */
1200 pm_runtime_enable(&card->dev);
1201 }
1202
1203 /*
1204 * The number of functions on the card is encoded inside
1205 * the ocr.
1206 */
1207 funcs = (ocr & 0x70000000) >> 28;
1208 card->sdio_funcs = 0;
1209
1210 /*
1211 * Initialize (but don't add) all present functions.
1212 */
1213 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1214 err = sdio_init_func(host->card, i + 1);
1215 if (err)
1216 goto remove;
1217
1218 /*
1219 * Enable Runtime PM for this func (if supported)
1220 */
1221 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1222 pm_runtime_enable(&card->sdio_func[i]->dev);
1223 }
1224
1225 /*
1226 * First add the card to the driver model...
1227 */
1228 mmc_release_host(host);
1229 err = mmc_add_card(host->card);
1230 if (err)
1231 goto remove_added;
1232
1233 /*
1234 * ...then the SDIO functions.
1235 */
1236 for (i = 0;i < funcs;i++) {
1237 err = sdio_add_func(host->card->sdio_func[i]);
1238 if (err)
1239 goto remove_added;
1240 }
1241
1242 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1243 pm_runtime_put(&card->dev);
1244
1245 mmc_claim_host(host);
1246 return 0;
1247
1248
1249remove:
1250 mmc_release_host(host);
1251remove_added:
1252 /*
1253 * The devices are being deleted so it is not necessary to disable
1254 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1255 * because it needs to be active to remove any function devices that
1256 * were probed, and after that it gets deleted.
1257 */
1258 mmc_sdio_remove(host);
1259 mmc_claim_host(host);
1260err:
1261 mmc_detach_bus(host);
1262
1263 pr_err("%s: error %d whilst initialising SDIO card\n",
1264 mmc_hostname(host), err);
1265
1266 return err;
1267}
1268
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
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 if (WARN_ON(fn > SDIO_MAX_FUNCS))
66 return -EINVAL;
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 unsigned int max_rate;
444
445 /*
446 * If the host doesn't support any of the UHS-I modes, fallback on
447 * default speed.
448 */
449 if (!mmc_host_uhs(card->host))
450 return 0;
451
452 bus_speed = SDIO_SPEED_SDR12;
453 timing = MMC_TIMING_UHS_SDR12;
454 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
455 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
456 bus_speed = SDIO_SPEED_SDR104;
457 timing = MMC_TIMING_UHS_SDR104;
458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
459 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
460 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
461 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
462 bus_speed = SDIO_SPEED_DDR50;
463 timing = MMC_TIMING_UHS_DDR50;
464 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
465 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
467 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
468 SD_MODE_UHS_SDR50)) {
469 bus_speed = SDIO_SPEED_SDR50;
470 timing = MMC_TIMING_UHS_SDR50;
471 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
476 bus_speed = SDIO_SPEED_SDR25;
477 timing = MMC_TIMING_UHS_SDR25;
478 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
479 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
480 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
481 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
483 SD_MODE_UHS_SDR12)) {
484 bus_speed = SDIO_SPEED_SDR12;
485 timing = MMC_TIMING_UHS_SDR12;
486 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
487 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
488 }
489
490 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
491 if (err)
492 return err;
493
494 speed &= ~SDIO_SPEED_BSS_MASK;
495 speed |= bus_speed;
496 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
497 if (err)
498 return err;
499
500 max_rate = min_not_zero(card->quirk_max_rate,
501 card->sw_caps.uhs_max_dtr);
502
503 if (bus_speed) {
504 mmc_set_timing(card->host, timing);
505 mmc_set_clock(card->host, max_rate);
506 }
507
508 return 0;
509}
510
511/*
512 * UHS-I specific initialization procedure
513 */
514static int mmc_sdio_init_uhs_card(struct mmc_card *card)
515{
516 int err;
517
518 if (!card->scr.sda_spec3)
519 return 0;
520
521 /* Switch to wider bus */
522 err = sdio_enable_4bit_bus(card);
523 if (err)
524 goto out;
525
526 /* Set the driver strength for the card */
527 sdio_select_driver_type(card);
528
529 /* Set bus speed mode of the card */
530 err = sdio_set_bus_speed_mode(card);
531 if (err)
532 goto out;
533
534 /*
535 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
536 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
537 */
538 if (!mmc_host_is_spi(card->host) &&
539 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
540 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
541 err = mmc_execute_tuning(card);
542out:
543 return err;
544}
545
546static void mmc_sdio_resend_if_cond(struct mmc_host *host,
547 struct mmc_card *card)
548{
549 sdio_reset(host);
550 mmc_go_idle(host);
551 mmc_send_if_cond(host, host->ocr_avail);
552 mmc_remove_card(card);
553}
554
555/*
556 * Handle the detection and initialisation of a card.
557 *
558 * In the case of a resume, "oldcard" will contain the card
559 * we're trying to reinitialise.
560 */
561static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
562 struct mmc_card *oldcard)
563{
564 struct mmc_card *card;
565 int err;
566 int retries = 10;
567 u32 rocr = 0;
568 u32 ocr_card = ocr;
569
570 WARN_ON(!host->claimed);
571
572 /* to query card if 1.8V signalling is supported */
573 if (mmc_host_uhs(host))
574 ocr |= R4_18V_PRESENT;
575
576try_again:
577 if (!retries) {
578 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
579 ocr &= ~R4_18V_PRESENT;
580 }
581
582 /*
583 * Inform the card of the voltage
584 */
585 err = mmc_send_io_op_cond(host, ocr, &rocr);
586 if (err)
587 goto err;
588
589 /*
590 * For SPI, enable CRC as appropriate.
591 */
592 if (mmc_host_is_spi(host)) {
593 err = mmc_spi_set_crc(host, use_spi_crc);
594 if (err)
595 goto err;
596 }
597
598 /*
599 * Allocate card structure.
600 */
601 card = mmc_alloc_card(host, NULL);
602 if (IS_ERR(card)) {
603 err = PTR_ERR(card);
604 goto err;
605 }
606
607 if ((rocr & R4_MEMORY_PRESENT) &&
608 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
609 card->type = MMC_TYPE_SD_COMBO;
610
611 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
612 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
613 mmc_remove_card(card);
614 pr_debug("%s: Perhaps the card was replaced\n",
615 mmc_hostname(host));
616 return -ENOENT;
617 }
618 } else {
619 card->type = MMC_TYPE_SDIO;
620
621 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
622 mmc_remove_card(card);
623 pr_debug("%s: Perhaps the card was replaced\n",
624 mmc_hostname(host));
625 return -ENOENT;
626 }
627 }
628
629 /*
630 * Call the optional HC's init_card function to handle quirks.
631 */
632 if (host->ops->init_card)
633 host->ops->init_card(host, card);
634
635 /*
636 * If the host and card support UHS-I mode request the card
637 * to switch to 1.8V signaling level. No 1.8v signalling if
638 * UHS mode is not enabled to maintain compatibility and some
639 * systems that claim 1.8v signalling in fact do not support
640 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
641 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
642 * fails to check rocr & R4_18V_PRESENT, but we still need to
643 * try to init uhs card. sdio_read_cccr will take over this task
644 * to make sure which speed mode should work.
645 */
646 if (rocr & ocr & R4_18V_PRESENT) {
647 err = mmc_set_uhs_voltage(host, ocr_card);
648 if (err == -EAGAIN) {
649 mmc_sdio_resend_if_cond(host, card);
650 retries--;
651 goto try_again;
652 } else if (err) {
653 ocr &= ~R4_18V_PRESENT;
654 }
655 }
656
657 /*
658 * For native busses: set card RCA and quit open drain mode.
659 */
660 if (!mmc_host_is_spi(host)) {
661 err = mmc_send_relative_addr(host, &card->rca);
662 if (err)
663 goto remove;
664
665 /*
666 * Update oldcard with the new RCA received from the SDIO
667 * device -- we're doing this so that it's updated in the
668 * "card" struct when oldcard overwrites that later.
669 */
670 if (oldcard)
671 oldcard->rca = card->rca;
672 }
673
674 /*
675 * Read CSD, before selecting the card
676 */
677 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
678 err = mmc_sd_get_csd(host, card);
679 if (err)
680 return err;
681
682 mmc_decode_cid(card);
683 }
684
685 /*
686 * Select card, as all following commands rely on that.
687 */
688 if (!mmc_host_is_spi(host)) {
689 err = mmc_select_card(card);
690 if (err)
691 goto remove;
692 }
693
694 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
695 /*
696 * This is non-standard SDIO device, meaning it doesn't
697 * have any CIA (Common I/O area) registers present.
698 * It's host's responsibility to fill cccr and cis
699 * structures in init_card().
700 */
701 mmc_set_clock(host, card->cis.max_dtr);
702
703 if (card->cccr.high_speed) {
704 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
705 }
706
707 goto finish;
708 }
709
710 /*
711 * Read the common registers. Note that we should try to
712 * validate whether UHS would work or not.
713 */
714 err = sdio_read_cccr(card, ocr);
715 if (err) {
716 mmc_sdio_resend_if_cond(host, card);
717 if (ocr & R4_18V_PRESENT) {
718 /* Retry init sequence, but without R4_18V_PRESENT. */
719 retries = 0;
720 goto try_again;
721 } else {
722 goto remove;
723 }
724 }
725
726 /*
727 * Read the common CIS tuples.
728 */
729 err = sdio_read_common_cis(card);
730 if (err)
731 goto remove;
732
733 if (oldcard) {
734 int same = (card->cis.vendor == oldcard->cis.vendor &&
735 card->cis.device == oldcard->cis.device);
736 mmc_remove_card(card);
737 if (!same) {
738 pr_debug("%s: Perhaps the card was replaced\n",
739 mmc_hostname(host));
740 return -ENOENT;
741 }
742
743 card = oldcard;
744 }
745 card->ocr = ocr_card;
746 mmc_fixup_device(card, sdio_fixup_methods);
747
748 if (card->type == MMC_TYPE_SD_COMBO) {
749 err = mmc_sd_setup_card(host, card, oldcard != NULL);
750 /* handle as SDIO-only card if memory init failed */
751 if (err) {
752 mmc_go_idle(host);
753 if (mmc_host_is_spi(host))
754 /* should not fail, as it worked previously */
755 mmc_spi_set_crc(host, use_spi_crc);
756 card->type = MMC_TYPE_SDIO;
757 } else
758 card->dev.type = &sd_type;
759 }
760
761 /*
762 * If needed, disconnect card detection pull-up resistor.
763 */
764 err = sdio_disable_cd(card);
765 if (err)
766 goto remove;
767
768 /* Initialization sequence for UHS-I cards */
769 /* Only if card supports 1.8v and UHS signaling */
770 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
771 err = mmc_sdio_init_uhs_card(card);
772 if (err)
773 goto remove;
774 } else {
775 /*
776 * Switch to high-speed (if supported).
777 */
778 err = sdio_enable_hs(card);
779 if (err > 0)
780 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
781 else if (err)
782 goto remove;
783
784 /*
785 * Change to the card's maximum speed.
786 */
787 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
788
789 /*
790 * Switch to wider bus (if supported).
791 */
792 err = sdio_enable_4bit_bus(card);
793 if (err)
794 goto remove;
795 }
796
797 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
798 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
799 pr_err("%s: Host failed to negotiate down from 3.3V\n",
800 mmc_hostname(host));
801 err = -EINVAL;
802 goto remove;
803 }
804finish:
805 if (!oldcard)
806 host->card = card;
807 return 0;
808
809remove:
810 if (!oldcard)
811 mmc_remove_card(card);
812
813err:
814 return err;
815}
816
817static int mmc_sdio_reinit_card(struct mmc_host *host)
818{
819 int ret;
820
821 /*
822 * Reset the card by performing the same steps that are taken by
823 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
824 *
825 * sdio_reset() is technically not needed. Having just powered up the
826 * hardware, it should already be in reset state. However, some
827 * platforms (such as SD8686 on OLPC) do not instantly cut power,
828 * meaning that a reset is required when restoring power soon after
829 * powering off. It is harmless in other cases.
830 *
831 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
832 * is not necessary for non-removable cards. However, it is required
833 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
834 * harmless in other situations.
835 *
836 */
837
838 sdio_reset(host);
839 mmc_go_idle(host);
840 mmc_send_if_cond(host, host->card->ocr);
841
842 ret = mmc_send_io_op_cond(host, 0, NULL);
843 if (ret)
844 return ret;
845
846 return mmc_sdio_init_card(host, host->card->ocr, host->card);
847}
848
849/*
850 * Host is being removed. Free up the current card.
851 */
852static void mmc_sdio_remove(struct mmc_host *host)
853{
854 int i;
855
856 for (i = 0;i < host->card->sdio_funcs;i++) {
857 if (host->card->sdio_func[i]) {
858 sdio_remove_func(host->card->sdio_func[i]);
859 host->card->sdio_func[i] = NULL;
860 }
861 }
862
863 mmc_remove_card(host->card);
864 host->card = NULL;
865}
866
867/*
868 * Card detection - card is alive.
869 */
870static int mmc_sdio_alive(struct mmc_host *host)
871{
872 return mmc_select_card(host->card);
873}
874
875/*
876 * Card detection callback from host.
877 */
878static void mmc_sdio_detect(struct mmc_host *host)
879{
880 int err;
881
882 /* Make sure card is powered before detecting it */
883 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
884 err = pm_runtime_get_sync(&host->card->dev);
885 if (err < 0) {
886 pm_runtime_put_noidle(&host->card->dev);
887 goto out;
888 }
889 }
890
891 mmc_claim_host(host);
892
893 /*
894 * Just check if our card has been removed.
895 */
896 err = _mmc_detect_card_removed(host);
897
898 mmc_release_host(host);
899
900 /*
901 * Tell PM core it's OK to power off the card now.
902 *
903 * The _sync variant is used in order to ensure that the card
904 * is left powered off in case an error occurred, and the card
905 * is going to be removed.
906 *
907 * Since there is no specific reason to believe a new user
908 * is about to show up at this point, the _sync variant is
909 * desirable anyway.
910 */
911 if (host->caps & MMC_CAP_POWER_OFF_CARD)
912 pm_runtime_put_sync(&host->card->dev);
913
914out:
915 if (err) {
916 mmc_sdio_remove(host);
917
918 mmc_claim_host(host);
919 mmc_detach_bus(host);
920 mmc_power_off(host);
921 mmc_release_host(host);
922 }
923}
924
925/*
926 * SDIO pre_suspend. We need to suspend all functions separately.
927 * Therefore all registered functions must have drivers with suspend
928 * and resume methods. Failing that we simply remove the whole card.
929 */
930static int mmc_sdio_pre_suspend(struct mmc_host *host)
931{
932 int i, err = 0;
933
934 for (i = 0; i < host->card->sdio_funcs; i++) {
935 struct sdio_func *func = host->card->sdio_func[i];
936 if (func && sdio_func_present(func) && func->dev.driver) {
937 const struct dev_pm_ops *pmops = func->dev.driver->pm;
938 if (!pmops || !pmops->suspend || !pmops->resume) {
939 /* force removal of entire card in that case */
940 err = -ENOSYS;
941 break;
942 }
943 }
944 }
945
946 return err;
947}
948
949/*
950 * SDIO suspend. Suspend all functions separately.
951 */
952static int mmc_sdio_suspend(struct mmc_host *host)
953{
954 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
955
956 /* Prevent processing of SDIO IRQs in suspended state. */
957 mmc_card_set_suspended(host->card);
958 cancel_delayed_work_sync(&host->sdio_irq_work);
959
960 mmc_claim_host(host);
961
962 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
963 sdio_disable_wide(host->card);
964
965 if (!mmc_card_keep_power(host)) {
966 mmc_power_off(host);
967 } else if (host->retune_period) {
968 mmc_retune_timer_stop(host);
969 mmc_retune_needed(host);
970 }
971
972 mmc_release_host(host);
973
974 return 0;
975}
976
977static int mmc_sdio_resume(struct mmc_host *host)
978{
979 int err = 0;
980
981 /* Basic card reinitialization. */
982 mmc_claim_host(host);
983
984 /*
985 * Restore power and reinitialize the card when needed. Note that a
986 * removable card is checked from a detect work later on in the resume
987 * process.
988 */
989 if (!mmc_card_keep_power(host)) {
990 mmc_power_up(host, host->card->ocr);
991 /*
992 * Tell runtime PM core we just powered up the card,
993 * since it still believes the card is powered off.
994 * Note that currently runtime PM is only enabled
995 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
996 */
997 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
998 pm_runtime_disable(&host->card->dev);
999 pm_runtime_set_active(&host->card->dev);
1000 pm_runtime_enable(&host->card->dev);
1001 }
1002 err = mmc_sdio_reinit_card(host);
1003 } else if (mmc_card_wake_sdio_irq(host)) {
1004 /* We may have switched to 1-bit mode during suspend */
1005 err = sdio_enable_4bit_bus(host->card);
1006 }
1007
1008 if (err)
1009 goto out;
1010
1011 /* Allow SDIO IRQs to be processed again. */
1012 mmc_card_clr_suspended(host->card);
1013
1014 if (host->sdio_irqs) {
1015 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1016 wake_up_process(host->sdio_irq_thread);
1017 else if (host->caps & MMC_CAP_SDIO_IRQ)
1018 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1019 }
1020
1021out:
1022 mmc_release_host(host);
1023
1024 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1025 return err;
1026}
1027
1028static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1029{
1030 /* No references to the card, cut the power to it. */
1031 mmc_claim_host(host);
1032 mmc_power_off(host);
1033 mmc_release_host(host);
1034
1035 return 0;
1036}
1037
1038static int mmc_sdio_runtime_resume(struct mmc_host *host)
1039{
1040 int ret;
1041
1042 /* Restore power and re-initialize. */
1043 mmc_claim_host(host);
1044 mmc_power_up(host, host->card->ocr);
1045 ret = mmc_sdio_reinit_card(host);
1046 mmc_release_host(host);
1047
1048 return ret;
1049}
1050
1051static int mmc_sdio_hw_reset(struct mmc_host *host)
1052{
1053 mmc_power_cycle(host, host->card->ocr);
1054 return mmc_sdio_reinit_card(host);
1055}
1056
1057static int mmc_sdio_sw_reset(struct mmc_host *host)
1058{
1059 mmc_set_clock(host, host->f_init);
1060 sdio_reset(host);
1061 mmc_go_idle(host);
1062
1063 mmc_set_initial_state(host);
1064 mmc_set_initial_signal_voltage(host);
1065
1066 return mmc_sdio_reinit_card(host);
1067}
1068
1069static const struct mmc_bus_ops mmc_sdio_ops = {
1070 .remove = mmc_sdio_remove,
1071 .detect = mmc_sdio_detect,
1072 .pre_suspend = mmc_sdio_pre_suspend,
1073 .suspend = mmc_sdio_suspend,
1074 .resume = mmc_sdio_resume,
1075 .runtime_suspend = mmc_sdio_runtime_suspend,
1076 .runtime_resume = mmc_sdio_runtime_resume,
1077 .alive = mmc_sdio_alive,
1078 .hw_reset = mmc_sdio_hw_reset,
1079 .sw_reset = mmc_sdio_sw_reset,
1080};
1081
1082
1083/*
1084 * Starting point for SDIO card init.
1085 */
1086int mmc_attach_sdio(struct mmc_host *host)
1087{
1088 int err, i, funcs;
1089 u32 ocr, rocr;
1090 struct mmc_card *card;
1091
1092 WARN_ON(!host->claimed);
1093
1094 err = mmc_send_io_op_cond(host, 0, &ocr);
1095 if (err)
1096 return err;
1097
1098 mmc_attach_bus(host, &mmc_sdio_ops);
1099 if (host->ocr_avail_sdio)
1100 host->ocr_avail = host->ocr_avail_sdio;
1101
1102
1103 rocr = mmc_select_voltage(host, ocr);
1104
1105 /*
1106 * Can we support the voltage(s) of the card(s)?
1107 */
1108 if (!rocr) {
1109 err = -EINVAL;
1110 goto err;
1111 }
1112
1113 /*
1114 * Detect and init the card.
1115 */
1116 err = mmc_sdio_init_card(host, rocr, NULL);
1117 if (err)
1118 goto err;
1119
1120 card = host->card;
1121
1122 /*
1123 * Enable runtime PM only if supported by host+card+board
1124 */
1125 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1126 /*
1127 * Do not allow runtime suspend until after SDIO function
1128 * devices are added.
1129 */
1130 pm_runtime_get_noresume(&card->dev);
1131
1132 /*
1133 * Let runtime PM core know our card is active
1134 */
1135 err = pm_runtime_set_active(&card->dev);
1136 if (err)
1137 goto remove;
1138
1139 /*
1140 * Enable runtime PM for this card
1141 */
1142 pm_runtime_enable(&card->dev);
1143 }
1144
1145 /*
1146 * The number of functions on the card is encoded inside
1147 * the ocr.
1148 */
1149 funcs = (ocr & 0x70000000) >> 28;
1150 card->sdio_funcs = 0;
1151
1152 /*
1153 * Initialize (but don't add) all present functions.
1154 */
1155 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1156 err = sdio_init_func(host->card, i + 1);
1157 if (err)
1158 goto remove;
1159
1160 /*
1161 * Enable Runtime PM for this func (if supported)
1162 */
1163 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1164 pm_runtime_enable(&card->sdio_func[i]->dev);
1165 }
1166
1167 /*
1168 * First add the card to the driver model...
1169 */
1170 mmc_release_host(host);
1171 err = mmc_add_card(host->card);
1172 if (err)
1173 goto remove_added;
1174
1175 /*
1176 * ...then the SDIO functions.
1177 */
1178 for (i = 0;i < funcs;i++) {
1179 err = sdio_add_func(host->card->sdio_func[i]);
1180 if (err)
1181 goto remove_added;
1182 }
1183
1184 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1185 pm_runtime_put(&card->dev);
1186
1187 mmc_claim_host(host);
1188 return 0;
1189
1190
1191remove:
1192 mmc_release_host(host);
1193remove_added:
1194 /*
1195 * The devices are being deleted so it is not necessary to disable
1196 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1197 * because it needs to be active to remove any function devices that
1198 * were probed, and after that it gets deleted.
1199 */
1200 mmc_sdio_remove(host);
1201 mmc_claim_host(host);
1202err:
1203 mmc_detach_bus(host);
1204
1205 pr_err("%s: error %d whilst initialising SDIO card\n",
1206 mmc_hostname(host), err);
1207
1208 return err;
1209}
1210