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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 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
110
111 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
112 if (ret)
113 goto out;
114
115 cccr_vsn = data & 0x0f;
116
117 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
118 pr_err("%s: unrecognised CCCR structure version %d\n",
119 mmc_hostname(card->host), cccr_vsn);
120 return -EINVAL;
121 }
122
123 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
124
125 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
126 if (ret)
127 goto out;
128
129 if (data & SDIO_CCCR_CAP_SMB)
130 card->cccr.multi_block = 1;
131 if (data & SDIO_CCCR_CAP_LSC)
132 card->cccr.low_speed = 1;
133 if (data & SDIO_CCCR_CAP_4BLS)
134 card->cccr.wide_bus = 1;
135
136 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
137 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
138 if (ret)
139 goto out;
140
141 if (data & SDIO_POWER_SMPC)
142 card->cccr.high_power = 1;
143 }
144
145 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
146 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
147 if (ret)
148 goto out;
149
150 card->scr.sda_spec3 = 0;
151 card->sw_caps.sd3_bus_mode = 0;
152 card->sw_caps.sd3_drv_type = 0;
153 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
154 card->scr.sda_spec3 = 1;
155 ret = mmc_io_rw_direct(card, 0, 0,
156 SDIO_CCCR_UHS, 0, &data);
157 if (ret)
158 goto out;
159
160 if (card->host->caps &
161 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
162 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
163 MMC_CAP_UHS_DDR50)) {
164 if (data & SDIO_UHS_DDR50)
165 card->sw_caps.sd3_bus_mode
166 |= SD_MODE_UHS_DDR50;
167
168 if (data & SDIO_UHS_SDR50)
169 card->sw_caps.sd3_bus_mode
170 |= SD_MODE_UHS_SDR50;
171
172 if (data & SDIO_UHS_SDR104)
173 card->sw_caps.sd3_bus_mode
174 |= SD_MODE_UHS_SDR104;
175 }
176
177 ret = mmc_io_rw_direct(card, 0, 0,
178 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
179 if (ret)
180 goto out;
181
182 if (data & SDIO_DRIVE_SDTA)
183 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
184 if (data & SDIO_DRIVE_SDTC)
185 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
186 if (data & SDIO_DRIVE_SDTD)
187 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
188 }
189
190 /* if no uhs mode ensure we check for high speed */
191 if (!card->sw_caps.sd3_bus_mode) {
192 if (speed & SDIO_SPEED_SHS) {
193 card->cccr.high_speed = 1;
194 card->sw_caps.hs_max_dtr = 50000000;
195 } else {
196 card->cccr.high_speed = 0;
197 card->sw_caps.hs_max_dtr = 25000000;
198 }
199 }
200 }
201
202out:
203 return ret;
204}
205
206static int sdio_enable_wide(struct mmc_card *card)
207{
208 int ret;
209 u8 ctrl;
210
211 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
212 return 0;
213
214 if (card->cccr.low_speed && !card->cccr.wide_bus)
215 return 0;
216
217 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
218 if (ret)
219 return ret;
220
221 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
222 pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
223 mmc_hostname(card->host), ctrl);
224
225 /* set as 4-bit bus width */
226 ctrl &= ~SDIO_BUS_WIDTH_MASK;
227 ctrl |= SDIO_BUS_WIDTH_4BIT;
228
229 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
230 if (ret)
231 return ret;
232
233 return 1;
234}
235
236/*
237 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
238 * of the card. This may be required on certain setups of boards,
239 * controllers and embedded sdio device which do not need the card's
240 * pull-up. As a result, card detection is disabled and power is saved.
241 */
242static int sdio_disable_cd(struct mmc_card *card)
243{
244 int ret;
245 u8 ctrl;
246
247 if (!mmc_card_disable_cd(card))
248 return 0;
249
250 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
251 if (ret)
252 return ret;
253
254 ctrl |= SDIO_BUS_CD_DISABLE;
255
256 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
257}
258
259/*
260 * Devices that remain active during a system suspend are
261 * put back into 1-bit mode.
262 */
263static int sdio_disable_wide(struct mmc_card *card)
264{
265 int ret;
266 u8 ctrl;
267
268 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
269 return 0;
270
271 if (card->cccr.low_speed && !card->cccr.wide_bus)
272 return 0;
273
274 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
275 if (ret)
276 return ret;
277
278 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
279 return 0;
280
281 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
282 ctrl |= SDIO_BUS_ASYNC_INT;
283
284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
285 if (ret)
286 return ret;
287
288 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
289
290 return 0;
291}
292
293
294static int sdio_enable_4bit_bus(struct mmc_card *card)
295{
296 int err;
297
298 if (card->type == MMC_TYPE_SDIO)
299 return sdio_enable_wide(card);
300
301 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
302 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
303 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
304 if (err)
305 return err;
306 } else
307 return 0;
308
309 err = sdio_enable_wide(card);
310 if (err <= 0)
311 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
312
313 return err;
314}
315
316
317/*
318 * Test if the card supports high-speed mode and, if so, switch to it.
319 */
320static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
321{
322 int ret;
323 u8 speed;
324
325 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
326 return 0;
327
328 if (!card->cccr.high_speed)
329 return 0;
330
331 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
332 if (ret)
333 return ret;
334
335 if (enable)
336 speed |= SDIO_SPEED_EHS;
337 else
338 speed &= ~SDIO_SPEED_EHS;
339
340 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
341 if (ret)
342 return ret;
343
344 return 1;
345}
346
347/*
348 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
349 */
350static int sdio_enable_hs(struct mmc_card *card)
351{
352 int ret;
353
354 ret = mmc_sdio_switch_hs(card, true);
355 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
356 return ret;
357
358 ret = mmc_sd_switch_hs(card);
359 if (ret <= 0)
360 mmc_sdio_switch_hs(card, false);
361
362 return ret;
363}
364
365static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
366{
367 unsigned max_dtr;
368
369 if (mmc_card_highspeed(card)) {
370 /*
371 * The SDIO specification doesn't mention how
372 * the CIS transfer speed register relates to
373 * high-speed, but it seems that 50 MHz is
374 * mandatory.
375 */
376 max_dtr = 50000000;
377 } else {
378 max_dtr = card->cis.max_dtr;
379 }
380
381 if (card->type == MMC_TYPE_SD_COMBO)
382 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
383
384 return max_dtr;
385}
386
387static unsigned char host_drive_to_sdio_drive(int host_strength)
388{
389 switch (host_strength) {
390 case MMC_SET_DRIVER_TYPE_A:
391 return SDIO_DTSx_SET_TYPE_A;
392 case MMC_SET_DRIVER_TYPE_B:
393 return SDIO_DTSx_SET_TYPE_B;
394 case MMC_SET_DRIVER_TYPE_C:
395 return SDIO_DTSx_SET_TYPE_C;
396 case MMC_SET_DRIVER_TYPE_D:
397 return SDIO_DTSx_SET_TYPE_D;
398 default:
399 return SDIO_DTSx_SET_TYPE_B;
400 }
401}
402
403static void sdio_select_driver_type(struct mmc_card *card)
404{
405 int host_drv_type = SD_DRIVER_TYPE_B;
406 int card_drv_type = SD_DRIVER_TYPE_B;
407 int drive_strength;
408 unsigned char card_strength;
409 int err;
410
411 /*
412 * If the host doesn't support any of the Driver Types A,C or D,
413 * or there is no board specific handler then default Driver
414 * Type B is used.
415 */
416 if (!(card->host->caps &
417 (MMC_CAP_DRIVER_TYPE_A |
418 MMC_CAP_DRIVER_TYPE_C |
419 MMC_CAP_DRIVER_TYPE_D)))
420 return;
421
422 if (!card->host->ops->select_drive_strength)
423 return;
424
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
426 host_drv_type |= SD_DRIVER_TYPE_A;
427
428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
429 host_drv_type |= SD_DRIVER_TYPE_C;
430
431 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
432 host_drv_type |= SD_DRIVER_TYPE_D;
433
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
435 card_drv_type |= SD_DRIVER_TYPE_A;
436
437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
438 card_drv_type |= SD_DRIVER_TYPE_C;
439
440 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
441 card_drv_type |= SD_DRIVER_TYPE_D;
442
443 /*
444 * The drive strength that the hardware can support
445 * depends on the board design. Pass the appropriate
446 * information and let the hardware specific code
447 * return what is possible given the options
448 */
449 drive_strength = card->host->ops->select_drive_strength(
450 card->sw_caps.uhs_max_dtr,
451 host_drv_type, card_drv_type);
452
453 /* if error just use default for drive strength B */
454 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
455 &card_strength);
456 if (err)
457 return;
458
459 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
460 card_strength |= host_drive_to_sdio_drive(drive_strength);
461
462 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
463 card_strength, NULL);
464
465 /* if error default to drive strength B */
466 if (!err)
467 mmc_set_driver_type(card->host, drive_strength);
468}
469
470
471static int sdio_set_bus_speed_mode(struct mmc_card *card)
472{
473 unsigned int bus_speed, timing;
474 int err;
475 unsigned char speed;
476
477 /*
478 * If the host doesn't support any of the UHS-I modes, fallback on
479 * default speed.
480 */
481 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
483 return 0;
484
485 bus_speed = SDIO_SPEED_SDR12;
486 timing = MMC_TIMING_UHS_SDR12;
487 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
489 bus_speed = SDIO_SPEED_SDR104;
490 timing = MMC_TIMING_UHS_SDR104;
491 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
492 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
494 bus_speed = SDIO_SPEED_DDR50;
495 timing = MMC_TIMING_UHS_DDR50;
496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
499 SD_MODE_UHS_SDR50)) {
500 bus_speed = SDIO_SPEED_SDR50;
501 timing = MMC_TIMING_UHS_SDR50;
502 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
503 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
504 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
505 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
506 bus_speed = SDIO_SPEED_SDR25;
507 timing = MMC_TIMING_UHS_SDR25;
508 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
509 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
510 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
511 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
512 SD_MODE_UHS_SDR12)) {
513 bus_speed = SDIO_SPEED_SDR12;
514 timing = MMC_TIMING_UHS_SDR12;
515 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516 }
517
518 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
519 if (err)
520 return err;
521
522 speed &= ~SDIO_SPEED_BSS_MASK;
523 speed |= bus_speed;
524 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
525 if (err)
526 return err;
527
528 if (bus_speed) {
529 mmc_set_timing(card->host, timing);
530 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
531 }
532
533 return 0;
534}
535
536/*
537 * UHS-I specific initialization procedure
538 */
539static int mmc_sdio_init_uhs_card(struct mmc_card *card)
540{
541 int err;
542
543 if (!card->scr.sda_spec3)
544 return 0;
545
546 /*
547 * Switch to wider bus (if supported).
548 */
549 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
550 err = sdio_enable_4bit_bus(card);
551 if (err > 0) {
552 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
553 err = 0;
554 }
555 }
556
557 /* Set the driver strength for the card */
558 sdio_select_driver_type(card);
559
560 /* Set bus speed mode of the card */
561 err = sdio_set_bus_speed_mode(card);
562 if (err)
563 goto out;
564
565 /* Initialize and start re-tuning timer */
566 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
567 err = card->host->ops->execute_tuning(card->host,
568 MMC_SEND_TUNING_BLOCK);
569
570out:
571
572 return err;
573}
574
575/*
576 * Handle the detection and initialisation of a card.
577 *
578 * In the case of a resume, "oldcard" will contain the card
579 * we're trying to reinitialise.
580 */
581static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
582 struct mmc_card *oldcard, int powered_resume)
583{
584 struct mmc_card *card;
585 int err;
586
587 BUG_ON(!host);
588 WARN_ON(!host->claimed);
589
590 /*
591 * Inform the card of the voltage
592 */
593 if (!powered_resume) {
594 /* The initialization should be done at 3.3 V I/O voltage. */
595 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
596
597 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
598 if (err)
599 goto err;
600 }
601
602 /*
603 * For SPI, enable CRC as appropriate.
604 */
605 if (mmc_host_is_spi(host)) {
606 err = mmc_spi_set_crc(host, use_spi_crc);
607 if (err)
608 goto err;
609 }
610
611 /*
612 * Allocate card structure.
613 */
614 card = mmc_alloc_card(host, NULL);
615 if (IS_ERR(card)) {
616 err = PTR_ERR(card);
617 goto err;
618 }
619
620 if ((ocr & R4_MEMORY_PRESENT) &&
621 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
622 card->type = MMC_TYPE_SD_COMBO;
623
624 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
625 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
626 mmc_remove_card(card);
627 return -ENOENT;
628 }
629 } else {
630 card->type = MMC_TYPE_SDIO;
631
632 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
633 mmc_remove_card(card);
634 return -ENOENT;
635 }
636 }
637
638 /*
639 * Call the optional HC's init_card function to handle quirks.
640 */
641 if (host->ops->init_card)
642 host->ops->init_card(host, card);
643
644 /*
645 * If the host and card support UHS-I mode request the card
646 * to switch to 1.8V signaling level. No 1.8v signalling if
647 * UHS mode is not enabled to maintain compatibilty and some
648 * systems that claim 1.8v signalling in fact do not support
649 * it.
650 */
651 if ((ocr & R4_18V_PRESENT) &&
652 (host->caps &
653 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
654 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
655 MMC_CAP_UHS_DDR50))) {
656 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
657 true);
658 if (err) {
659 ocr &= ~R4_18V_PRESENT;
660 host->ocr &= ~R4_18V_PRESENT;
661 }
662 err = 0;
663 } else {
664 ocr &= ~R4_18V_PRESENT;
665 host->ocr &= ~R4_18V_PRESENT;
666 }
667
668 /*
669 * For native busses: set card RCA and quit open drain mode.
670 */
671 if (!powered_resume && !mmc_host_is_spi(host)) {
672 err = mmc_send_relative_addr(host, &card->rca);
673 if (err)
674 goto remove;
675
676 /*
677 * Update oldcard with the new RCA received from the SDIO
678 * device -- we're doing this so that it's updated in the
679 * "card" struct when oldcard overwrites that later.
680 */
681 if (oldcard)
682 oldcard->rca = card->rca;
683 }
684
685 /*
686 * Read CSD, before selecting the card
687 */
688 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
689 err = mmc_sd_get_csd(host, card);
690 if (err)
691 return err;
692
693 mmc_decode_cid(card);
694 }
695
696 /*
697 * Select card, as all following commands rely on that.
698 */
699 if (!powered_resume && !mmc_host_is_spi(host)) {
700 err = mmc_select_card(card);
701 if (err)
702 goto remove;
703 }
704
705 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
706 /*
707 * This is non-standard SDIO device, meaning it doesn't
708 * have any CIA (Common I/O area) registers present.
709 * It's host's responsibility to fill cccr and cis
710 * structures in init_card().
711 */
712 mmc_set_clock(host, card->cis.max_dtr);
713
714 if (card->cccr.high_speed) {
715 mmc_card_set_highspeed(card);
716 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
717 }
718
719 goto finish;
720 }
721
722 /*
723 * Read the common registers.
724 */
725 err = sdio_read_cccr(card, ocr);
726 if (err)
727 goto remove;
728
729 /*
730 * Read the common CIS tuples.
731 */
732 err = sdio_read_common_cis(card);
733 if (err)
734 goto remove;
735
736 if (oldcard) {
737 int same = (card->cis.vendor == oldcard->cis.vendor &&
738 card->cis.device == oldcard->cis.device);
739 mmc_remove_card(card);
740 if (!same)
741 return -ENOENT;
742
743 card = oldcard;
744 }
745 mmc_fixup_device(card, NULL);
746
747 if (card->type == MMC_TYPE_SD_COMBO) {
748 err = mmc_sd_setup_card(host, card, oldcard != NULL);
749 /* handle as SDIO-only card if memory init failed */
750 if (err) {
751 mmc_go_idle(host);
752 if (mmc_host_is_spi(host))
753 /* should not fail, as it worked previously */
754 mmc_spi_set_crc(host, use_spi_crc);
755 card->type = MMC_TYPE_SDIO;
756 } else
757 card->dev.type = &sd_type;
758 }
759
760 /*
761 * If needed, disconnect card detection pull-up resistor.
762 */
763 err = sdio_disable_cd(card);
764 if (err)
765 goto remove;
766
767 /* Initialization sequence for UHS-I cards */
768 /* Only if card supports 1.8v and UHS signaling */
769 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
770 err = mmc_sdio_init_uhs_card(card);
771 if (err)
772 goto remove;
773
774 /* Card is an ultra-high-speed card */
775 mmc_card_set_uhs(card);
776 } else {
777 /*
778 * Switch to high-speed (if supported).
779 */
780 err = sdio_enable_hs(card);
781 if (err > 0)
782 mmc_sd_go_highspeed(card);
783 else if (err)
784 goto remove;
785
786 /*
787 * Change to the card's maximum speed.
788 */
789 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
790
791 /*
792 * Switch to wider bus (if supported).
793 */
794 err = sdio_enable_4bit_bus(card);
795 if (err > 0)
796 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
797 else if (err)
798 goto remove;
799 }
800finish:
801 if (!oldcard)
802 host->card = card;
803 return 0;
804
805remove:
806 if (!oldcard)
807 mmc_remove_card(card);
808
809err:
810 return err;
811}
812
813/*
814 * Host is being removed. Free up the current card.
815 */
816static void mmc_sdio_remove(struct mmc_host *host)
817{
818 int i;
819
820 BUG_ON(!host);
821 BUG_ON(!host->card);
822
823 for (i = 0;i < host->card->sdio_funcs;i++) {
824 if (host->card->sdio_func[i]) {
825 sdio_remove_func(host->card->sdio_func[i]);
826 host->card->sdio_func[i] = NULL;
827 }
828 }
829
830 mmc_remove_card(host->card);
831 host->card = NULL;
832}
833
834/*
835 * Card detection - card is alive.
836 */
837static int mmc_sdio_alive(struct mmc_host *host)
838{
839 return mmc_select_card(host->card);
840}
841
842/*
843 * Card detection callback from host.
844 */
845static void mmc_sdio_detect(struct mmc_host *host)
846{
847 int err;
848
849 BUG_ON(!host);
850 BUG_ON(!host->card);
851
852 /* Make sure card is powered before detecting it */
853 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
854 err = pm_runtime_get_sync(&host->card->dev);
855 if (err < 0)
856 goto out;
857 }
858
859 mmc_claim_host(host);
860
861 /*
862 * Just check if our card has been removed.
863 */
864 err = _mmc_detect_card_removed(host);
865
866 mmc_release_host(host);
867
868 /*
869 * Tell PM core it's OK to power off the card now.
870 *
871 * The _sync variant is used in order to ensure that the card
872 * is left powered off in case an error occurred, and the card
873 * is going to be removed.
874 *
875 * Since there is no specific reason to believe a new user
876 * is about to show up at this point, the _sync variant is
877 * desirable anyway.
878 */
879 if (host->caps & MMC_CAP_POWER_OFF_CARD)
880 pm_runtime_put_sync(&host->card->dev);
881
882out:
883 if (err) {
884 mmc_sdio_remove(host);
885
886 mmc_claim_host(host);
887 mmc_detach_bus(host);
888 mmc_power_off(host);
889 mmc_release_host(host);
890 }
891}
892
893/*
894 * SDIO suspend. We need to suspend all functions separately.
895 * Therefore all registered functions must have drivers with suspend
896 * and resume methods. Failing that we simply remove the whole card.
897 */
898static int mmc_sdio_suspend(struct mmc_host *host)
899{
900 int i, err = 0;
901
902 for (i = 0; i < host->card->sdio_funcs; i++) {
903 struct sdio_func *func = host->card->sdio_func[i];
904 if (func && sdio_func_present(func) && func->dev.driver) {
905 const struct dev_pm_ops *pmops = func->dev.driver->pm;
906 if (!pmops || !pmops->suspend || !pmops->resume) {
907 /* force removal of entire card in that case */
908 err = -ENOSYS;
909 } else
910 err = pmops->suspend(&func->dev);
911 if (err)
912 break;
913 }
914 }
915 while (err && --i >= 0) {
916 struct sdio_func *func = host->card->sdio_func[i];
917 if (func && sdio_func_present(func) && func->dev.driver) {
918 const struct dev_pm_ops *pmops = func->dev.driver->pm;
919 pmops->resume(&func->dev);
920 }
921 }
922
923 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
924 mmc_claim_host(host);
925 sdio_disable_wide(host->card);
926 mmc_release_host(host);
927 }
928
929 return err;
930}
931
932static int mmc_sdio_resume(struct mmc_host *host)
933{
934 int i, err = 0;
935
936 BUG_ON(!host);
937 BUG_ON(!host->card);
938
939 /* Basic card reinitialization. */
940 mmc_claim_host(host);
941
942 /* No need to reinitialize powered-resumed nonremovable cards */
943 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
944 err = mmc_sdio_init_card(host, host->ocr, host->card,
945 mmc_card_keep_power(host));
946 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
947 /* We may have switched to 1-bit mode during suspend */
948 err = sdio_enable_4bit_bus(host->card);
949 if (err > 0) {
950 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
951 err = 0;
952 }
953 }
954
955 if (!err && host->sdio_irqs)
956 wake_up_process(host->sdio_irq_thread);
957 mmc_release_host(host);
958
959 /*
960 * If the card looked to be the same as before suspending, then
961 * we proceed to resume all card functions. If one of them returns
962 * an error then we simply return that error to the core and the
963 * card will be redetected as new. It is the responsibility of
964 * the function driver to perform further tests with the extra
965 * knowledge it has of the card to confirm the card is indeed the
966 * same as before suspending (same MAC address for network cards,
967 * etc.) and return an error otherwise.
968 */
969 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
970 struct sdio_func *func = host->card->sdio_func[i];
971 if (func && sdio_func_present(func) && func->dev.driver) {
972 const struct dev_pm_ops *pmops = func->dev.driver->pm;
973 err = pmops->resume(&func->dev);
974 }
975 }
976
977 return err;
978}
979
980static int mmc_sdio_power_restore(struct mmc_host *host)
981{
982 int ret;
983 u32 ocr;
984
985 BUG_ON(!host);
986 BUG_ON(!host->card);
987
988 mmc_claim_host(host);
989
990 /*
991 * Reset the card by performing the same steps that are taken by
992 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
993 *
994 * sdio_reset() is technically not needed. Having just powered up the
995 * hardware, it should already be in reset state. However, some
996 * platforms (such as SD8686 on OLPC) do not instantly cut power,
997 * meaning that a reset is required when restoring power soon after
998 * powering off. It is harmless in other cases.
999 *
1000 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1001 * is not necessary for non-removable cards. However, it is required
1002 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1003 * harmless in other situations.
1004 *
1005 * With these steps taken, mmc_select_voltage() is also required to
1006 * restore the correct voltage setting of the card.
1007 */
1008
1009 /* The initialization should be done at 3.3 V I/O voltage. */
1010 if (!mmc_card_keep_power(host))
1011 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1012
1013 sdio_reset(host);
1014 mmc_go_idle(host);
1015 mmc_send_if_cond(host, host->ocr_avail);
1016
1017 ret = mmc_send_io_op_cond(host, 0, &ocr);
1018 if (ret)
1019 goto out;
1020
1021 if (host->ocr_avail_sdio)
1022 host->ocr_avail = host->ocr_avail_sdio;
1023
1024 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1025 if (!host->ocr) {
1026 ret = -EINVAL;
1027 goto out;
1028 }
1029
1030 ret = mmc_sdio_init_card(host, host->ocr, host->card,
1031 mmc_card_keep_power(host));
1032 if (!ret && host->sdio_irqs)
1033 mmc_signal_sdio_irq(host);
1034
1035out:
1036 mmc_release_host(host);
1037
1038 return ret;
1039}
1040
1041static const struct mmc_bus_ops mmc_sdio_ops = {
1042 .remove = mmc_sdio_remove,
1043 .detect = mmc_sdio_detect,
1044 .suspend = mmc_sdio_suspend,
1045 .resume = mmc_sdio_resume,
1046 .power_restore = mmc_sdio_power_restore,
1047 .alive = mmc_sdio_alive,
1048};
1049
1050
1051/*
1052 * Starting point for SDIO card init.
1053 */
1054int mmc_attach_sdio(struct mmc_host *host)
1055{
1056 int err, i, funcs;
1057 u32 ocr;
1058 struct mmc_card *card;
1059
1060 BUG_ON(!host);
1061 WARN_ON(!host->claimed);
1062
1063 err = mmc_send_io_op_cond(host, 0, &ocr);
1064 if (err)
1065 return err;
1066
1067 mmc_attach_bus(host, &mmc_sdio_ops);
1068 if (host->ocr_avail_sdio)
1069 host->ocr_avail = host->ocr_avail_sdio;
1070
1071 /*
1072 * Sanity check the voltages that the card claims to
1073 * support.
1074 */
1075 if (ocr & 0x7F) {
1076 pr_warning("%s: card claims to support voltages "
1077 "below the defined range. These will be ignored.\n",
1078 mmc_hostname(host));
1079 ocr &= ~0x7F;
1080 }
1081
1082 host->ocr = mmc_select_voltage(host, ocr);
1083
1084 /*
1085 * Can we support the voltage(s) of the card(s)?
1086 */
1087 if (!host->ocr) {
1088 err = -EINVAL;
1089 goto err;
1090 }
1091
1092 /*
1093 * Detect and init the card.
1094 */
1095 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1096 if (err) {
1097 if (err == -EAGAIN) {
1098 /*
1099 * Retry initialization with S18R set to 0.
1100 */
1101 host->ocr &= ~R4_18V_PRESENT;
1102 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1103 }
1104 if (err)
1105 goto err;
1106 }
1107 card = host->card;
1108
1109 /*
1110 * Enable runtime PM only if supported by host+card+board
1111 */
1112 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1113 /*
1114 * Let runtime PM core know our card is active
1115 */
1116 err = pm_runtime_set_active(&card->dev);
1117 if (err)
1118 goto remove;
1119
1120 /*
1121 * Enable runtime PM for this card
1122 */
1123 pm_runtime_enable(&card->dev);
1124 }
1125
1126 /*
1127 * The number of functions on the card is encoded inside
1128 * the ocr.
1129 */
1130 funcs = (ocr & 0x70000000) >> 28;
1131 card->sdio_funcs = 0;
1132
1133 /*
1134 * Initialize (but don't add) all present functions.
1135 */
1136 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1137 err = sdio_init_func(host->card, i + 1);
1138 if (err)
1139 goto remove;
1140
1141 /*
1142 * Enable Runtime PM for this func (if supported)
1143 */
1144 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1145 pm_runtime_enable(&card->sdio_func[i]->dev);
1146 }
1147
1148 /*
1149 * First add the card to the driver model...
1150 */
1151 mmc_release_host(host);
1152 err = mmc_add_card(host->card);
1153 if (err)
1154 goto remove_added;
1155
1156 /*
1157 * ...then the SDIO functions.
1158 */
1159 for (i = 0;i < funcs;i++) {
1160 err = sdio_add_func(host->card->sdio_func[i]);
1161 if (err)
1162 goto remove_added;
1163 }
1164
1165 mmc_claim_host(host);
1166 return 0;
1167
1168
1169remove_added:
1170 /* Remove without lock if the device has been added. */
1171 mmc_sdio_remove(host);
1172 mmc_claim_host(host);
1173remove:
1174 /* And with lock if it hasn't been added. */
1175 mmc_release_host(host);
1176 if (host->card)
1177 mmc_sdio_remove(host);
1178 mmc_claim_host(host);
1179err:
1180 mmc_detach_bus(host);
1181
1182 pr_err("%s: error %d whilst initialising SDIO card\n",
1183 mmc_hostname(host), err);
1184
1185 return err;
1186}
1187
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