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