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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 (mmc_host_uhs(card->host)) {
161 if (data & SDIO_UHS_DDR50)
162 card->sw_caps.sd3_bus_mode
163 |= SD_MODE_UHS_DDR50;
164
165 if (data & SDIO_UHS_SDR50)
166 card->sw_caps.sd3_bus_mode
167 |= SD_MODE_UHS_SDR50;
168
169 if (data & SDIO_UHS_SDR104)
170 card->sw_caps.sd3_bus_mode
171 |= SD_MODE_UHS_SDR104;
172 }
173
174 ret = mmc_io_rw_direct(card, 0, 0,
175 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
176 if (ret)
177 goto out;
178
179 if (data & SDIO_DRIVE_SDTA)
180 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
181 if (data & SDIO_DRIVE_SDTC)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
183 if (data & SDIO_DRIVE_SDTD)
184 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
185 }
186
187 /* if no uhs mode ensure we check for high speed */
188 if (!card->sw_caps.sd3_bus_mode) {
189 if (speed & SDIO_SPEED_SHS) {
190 card->cccr.high_speed = 1;
191 card->sw_caps.hs_max_dtr = 50000000;
192 } else {
193 card->cccr.high_speed = 0;
194 card->sw_caps.hs_max_dtr = 25000000;
195 }
196 }
197 }
198
199out:
200 return ret;
201}
202
203static int sdio_enable_wide(struct mmc_card *card)
204{
205 int ret;
206 u8 ctrl;
207
208 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
209 return 0;
210
211 if (card->cccr.low_speed && !card->cccr.wide_bus)
212 return 0;
213
214 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
215 if (ret)
216 return ret;
217
218 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
219 pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
220 mmc_hostname(card->host), ctrl);
221
222 /* set as 4-bit bus width */
223 ctrl &= ~SDIO_BUS_WIDTH_MASK;
224 ctrl |= SDIO_BUS_WIDTH_4BIT;
225
226 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
227 if (ret)
228 return ret;
229
230 return 1;
231}
232
233/*
234 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
235 * of the card. This may be required on certain setups of boards,
236 * controllers and embedded sdio device which do not need the card's
237 * pull-up. As a result, card detection is disabled and power is saved.
238 */
239static int sdio_disable_cd(struct mmc_card *card)
240{
241 int ret;
242 u8 ctrl;
243
244 if (!mmc_card_disable_cd(card))
245 return 0;
246
247 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
248 if (ret)
249 return ret;
250
251 ctrl |= SDIO_BUS_CD_DISABLE;
252
253 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
254}
255
256/*
257 * Devices that remain active during a system suspend are
258 * put back into 1-bit mode.
259 */
260static int sdio_disable_wide(struct mmc_card *card)
261{
262 int ret;
263 u8 ctrl;
264
265 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
266 return 0;
267
268 if (card->cccr.low_speed && !card->cccr.wide_bus)
269 return 0;
270
271 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
272 if (ret)
273 return ret;
274
275 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
276 return 0;
277
278 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
279 ctrl |= SDIO_BUS_ASYNC_INT;
280
281 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
282 if (ret)
283 return ret;
284
285 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
286
287 return 0;
288}
289
290
291static int sdio_enable_4bit_bus(struct mmc_card *card)
292{
293 int err;
294
295 if (card->type == MMC_TYPE_SDIO)
296 return sdio_enable_wide(card);
297
298 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
299 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
300 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
301 if (err)
302 return err;
303 } else
304 return 0;
305
306 err = sdio_enable_wide(card);
307 if (err <= 0)
308 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
309
310 return err;
311}
312
313
314/*
315 * Test if the card supports high-speed mode and, if so, switch to it.
316 */
317static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
318{
319 int ret;
320 u8 speed;
321
322 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
323 return 0;
324
325 if (!card->cccr.high_speed)
326 return 0;
327
328 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
329 if (ret)
330 return ret;
331
332 if (enable)
333 speed |= SDIO_SPEED_EHS;
334 else
335 speed &= ~SDIO_SPEED_EHS;
336
337 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
338 if (ret)
339 return ret;
340
341 return 1;
342}
343
344/*
345 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
346 */
347static int sdio_enable_hs(struct mmc_card *card)
348{
349 int ret;
350
351 ret = mmc_sdio_switch_hs(card, true);
352 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
353 return ret;
354
355 ret = mmc_sd_switch_hs(card);
356 if (ret <= 0)
357 mmc_sdio_switch_hs(card, false);
358
359 return ret;
360}
361
362static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
363{
364 unsigned max_dtr;
365
366 if (mmc_card_highspeed(card)) {
367 /*
368 * The SDIO specification doesn't mention how
369 * the CIS transfer speed register relates to
370 * high-speed, but it seems that 50 MHz is
371 * mandatory.
372 */
373 max_dtr = 50000000;
374 } else {
375 max_dtr = card->cis.max_dtr;
376 }
377
378 if (card->type == MMC_TYPE_SD_COMBO)
379 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
380
381 return max_dtr;
382}
383
384static unsigned char host_drive_to_sdio_drive(int host_strength)
385{
386 switch (host_strength) {
387 case MMC_SET_DRIVER_TYPE_A:
388 return SDIO_DTSx_SET_TYPE_A;
389 case MMC_SET_DRIVER_TYPE_B:
390 return SDIO_DTSx_SET_TYPE_B;
391 case MMC_SET_DRIVER_TYPE_C:
392 return SDIO_DTSx_SET_TYPE_C;
393 case MMC_SET_DRIVER_TYPE_D:
394 return SDIO_DTSx_SET_TYPE_D;
395 default:
396 return SDIO_DTSx_SET_TYPE_B;
397 }
398}
399
400static void sdio_select_driver_type(struct mmc_card *card)
401{
402 int host_drv_type = SD_DRIVER_TYPE_B;
403 int card_drv_type = SD_DRIVER_TYPE_B;
404 int drive_strength;
405 unsigned char card_strength;
406 int err;
407
408 /*
409 * If the host doesn't support any of the Driver Types A,C or D,
410 * or there is no board specific handler then default Driver
411 * Type B is used.
412 */
413 if (!(card->host->caps &
414 (MMC_CAP_DRIVER_TYPE_A |
415 MMC_CAP_DRIVER_TYPE_C |
416 MMC_CAP_DRIVER_TYPE_D)))
417 return;
418
419 if (!card->host->ops->select_drive_strength)
420 return;
421
422 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
423 host_drv_type |= SD_DRIVER_TYPE_A;
424
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
426 host_drv_type |= SD_DRIVER_TYPE_C;
427
428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
429 host_drv_type |= SD_DRIVER_TYPE_D;
430
431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
432 card_drv_type |= SD_DRIVER_TYPE_A;
433
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
435 card_drv_type |= SD_DRIVER_TYPE_C;
436
437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
438 card_drv_type |= SD_DRIVER_TYPE_D;
439
440 /*
441 * The drive strength that the hardware can support
442 * depends on the board design. Pass the appropriate
443 * information and let the hardware specific code
444 * return what is possible given the options
445 */
446 drive_strength = card->host->ops->select_drive_strength(
447 card->sw_caps.uhs_max_dtr,
448 host_drv_type, card_drv_type);
449
450 /* if error just use default for drive strength B */
451 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
452 &card_strength);
453 if (err)
454 return;
455
456 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
457 card_strength |= host_drive_to_sdio_drive(drive_strength);
458
459 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
460 card_strength, NULL);
461
462 /* if error default to drive strength B */
463 if (!err)
464 mmc_set_driver_type(card->host, drive_strength);
465}
466
467
468static int sdio_set_bus_speed_mode(struct mmc_card *card)
469{
470 unsigned int bus_speed, timing;
471 int err;
472 unsigned char speed;
473
474 /*
475 * If the host doesn't support any of the UHS-I modes, fallback on
476 * default speed.
477 */
478 if (!mmc_host_uhs(card->host))
479 return 0;
480
481 bus_speed = SDIO_SPEED_SDR12;
482 timing = MMC_TIMING_UHS_SDR12;
483 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
484 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
485 bus_speed = SDIO_SPEED_SDR104;
486 timing = MMC_TIMING_UHS_SDR104;
487 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
488 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
489 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
490 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
491 bus_speed = SDIO_SPEED_DDR50;
492 timing = MMC_TIMING_UHS_DDR50;
493 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
494 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
496 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
497 SD_MODE_UHS_SDR50)) {
498 bus_speed = SDIO_SPEED_SDR50;
499 timing = MMC_TIMING_UHS_SDR50;
500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
501 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
502 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
503 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
504 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
505 bus_speed = SDIO_SPEED_SDR25;
506 timing = MMC_TIMING_UHS_SDR25;
507 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
508 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
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 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
517 }
518
519 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
520 if (err)
521 return err;
522
523 speed &= ~SDIO_SPEED_BSS_MASK;
524 speed |= bus_speed;
525 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
526 if (err)
527 return err;
528
529 if (bus_speed) {
530 mmc_set_timing(card->host, timing);
531 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
532 }
533
534 return 0;
535}
536
537/*
538 * UHS-I specific initialization procedure
539 */
540static int mmc_sdio_init_uhs_card(struct mmc_card *card)
541{
542 int err;
543
544 if (!card->scr.sda_spec3)
545 return 0;
546
547 /*
548 * Switch to wider bus (if supported).
549 */
550 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
551 err = sdio_enable_4bit_bus(card);
552 if (err > 0) {
553 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
554 err = 0;
555 }
556 }
557
558 /* Set the driver strength for the card */
559 sdio_select_driver_type(card);
560
561 /* Set bus speed mode of the card */
562 err = sdio_set_bus_speed_mode(card);
563 if (err)
564 goto out;
565
566 /*
567 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
568 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
569 */
570 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
571 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
572 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104))) {
573 mmc_host_clk_hold(card->host);
574 err = card->host->ops->execute_tuning(card->host,
575 MMC_SEND_TUNING_BLOCK);
576 mmc_host_clk_release(card->host);
577 }
578
579out:
580
581 return err;
582}
583
584/*
585 * Handle the detection and initialisation of a card.
586 *
587 * In the case of a resume, "oldcard" will contain the card
588 * we're trying to reinitialise.
589 */
590static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
591 struct mmc_card *oldcard, int powered_resume)
592{
593 struct mmc_card *card;
594 int err;
595 int retries = 10;
596 u32 rocr = 0;
597 u32 ocr_card = ocr;
598
599 BUG_ON(!host);
600 WARN_ON(!host->claimed);
601
602 /* to query card if 1.8V signalling is supported */
603 if (mmc_host_uhs(host))
604 ocr |= R4_18V_PRESENT;
605
606try_again:
607 if (!retries) {
608 pr_warning("%s: Skipping voltage switch\n",
609 mmc_hostname(host));
610 ocr &= ~R4_18V_PRESENT;
611 }
612
613 /*
614 * Inform the card of the voltage
615 */
616 if (!powered_resume) {
617 err = mmc_send_io_op_cond(host, ocr, &rocr);
618 if (err)
619 goto err;
620 }
621
622 /*
623 * For SPI, enable CRC as appropriate.
624 */
625 if (mmc_host_is_spi(host)) {
626 err = mmc_spi_set_crc(host, use_spi_crc);
627 if (err)
628 goto err;
629 }
630
631 /*
632 * Allocate card structure.
633 */
634 card = mmc_alloc_card(host, NULL);
635 if (IS_ERR(card)) {
636 err = PTR_ERR(card);
637 goto err;
638 }
639
640 if ((rocr & R4_MEMORY_PRESENT) &&
641 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
642 card->type = MMC_TYPE_SD_COMBO;
643
644 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
645 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
646 mmc_remove_card(card);
647 return -ENOENT;
648 }
649 } else {
650 card->type = MMC_TYPE_SDIO;
651
652 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
653 mmc_remove_card(card);
654 return -ENOENT;
655 }
656 }
657
658 /*
659 * Call the optional HC's init_card function to handle quirks.
660 */
661 if (host->ops->init_card)
662 host->ops->init_card(host, card);
663
664 /*
665 * If the host and card support UHS-I mode request the card
666 * to switch to 1.8V signaling level. No 1.8v signalling if
667 * UHS mode is not enabled to maintain compatibility and some
668 * systems that claim 1.8v signalling in fact do not support
669 * it.
670 */
671 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
672 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
673 ocr);
674 if (err == -EAGAIN) {
675 sdio_reset(host);
676 mmc_go_idle(host);
677 mmc_send_if_cond(host, host->ocr_avail);
678 mmc_remove_card(card);
679 retries--;
680 goto try_again;
681 } else if (err) {
682 ocr &= ~R4_18V_PRESENT;
683 }
684 err = 0;
685 } else {
686 ocr &= ~R4_18V_PRESENT;
687 }
688
689 /*
690 * For native busses: set card RCA and quit open drain mode.
691 */
692 if (!powered_resume && !mmc_host_is_spi(host)) {
693 err = mmc_send_relative_addr(host, &card->rca);
694 if (err)
695 goto remove;
696
697 /*
698 * Update oldcard with the new RCA received from the SDIO
699 * device -- we're doing this so that it's updated in the
700 * "card" struct when oldcard overwrites that later.
701 */
702 if (oldcard)
703 oldcard->rca = card->rca;
704 }
705
706 /*
707 * Read CSD, before selecting the card
708 */
709 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
710 err = mmc_sd_get_csd(host, card);
711 if (err)
712 return err;
713
714 mmc_decode_cid(card);
715 }
716
717 /*
718 * Select card, as all following commands rely on that.
719 */
720 if (!powered_resume && !mmc_host_is_spi(host)) {
721 err = mmc_select_card(card);
722 if (err)
723 goto remove;
724 }
725
726 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
727 /*
728 * This is non-standard SDIO device, meaning it doesn't
729 * have any CIA (Common I/O area) registers present.
730 * It's host's responsibility to fill cccr and cis
731 * structures in init_card().
732 */
733 mmc_set_clock(host, card->cis.max_dtr);
734
735 if (card->cccr.high_speed) {
736 mmc_card_set_highspeed(card);
737 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
738 }
739
740 goto finish;
741 }
742
743 /*
744 * Read the common registers.
745 */
746 err = sdio_read_cccr(card, ocr);
747 if (err)
748 goto remove;
749
750 /*
751 * Read the common CIS tuples.
752 */
753 err = sdio_read_common_cis(card);
754 if (err)
755 goto remove;
756
757 if (oldcard) {
758 int same = (card->cis.vendor == oldcard->cis.vendor &&
759 card->cis.device == oldcard->cis.device);
760 mmc_remove_card(card);
761 if (!same)
762 return -ENOENT;
763
764 card = oldcard;
765 }
766 card->ocr = ocr_card;
767 mmc_fixup_device(card, NULL);
768
769 if (card->type == MMC_TYPE_SD_COMBO) {
770 err = mmc_sd_setup_card(host, card, oldcard != NULL);
771 /* handle as SDIO-only card if memory init failed */
772 if (err) {
773 mmc_go_idle(host);
774 if (mmc_host_is_spi(host))
775 /* should not fail, as it worked previously */
776 mmc_spi_set_crc(host, use_spi_crc);
777 card->type = MMC_TYPE_SDIO;
778 } else
779 card->dev.type = &sd_type;
780 }
781
782 /*
783 * If needed, disconnect card detection pull-up resistor.
784 */
785 err = sdio_disable_cd(card);
786 if (err)
787 goto remove;
788
789 /* Initialization sequence for UHS-I cards */
790 /* Only if card supports 1.8v and UHS signaling */
791 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
792 err = mmc_sdio_init_uhs_card(card);
793 if (err)
794 goto remove;
795
796 /* Card is an ultra-high-speed card */
797 mmc_card_set_uhs(card);
798 } else {
799 /*
800 * Switch to high-speed (if supported).
801 */
802 err = sdio_enable_hs(card);
803 if (err > 0)
804 mmc_sd_go_highspeed(card);
805 else if (err)
806 goto remove;
807
808 /*
809 * Change to the card's maximum speed.
810 */
811 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
812
813 /*
814 * Switch to wider bus (if supported).
815 */
816 err = sdio_enable_4bit_bus(card);
817 if (err > 0)
818 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
819 else if (err)
820 goto remove;
821 }
822finish:
823 if (!oldcard)
824 host->card = card;
825 return 0;
826
827remove:
828 if (!oldcard)
829 mmc_remove_card(card);
830
831err:
832 return err;
833}
834
835/*
836 * Host is being removed. Free up the current card.
837 */
838static void mmc_sdio_remove(struct mmc_host *host)
839{
840 int i;
841
842 BUG_ON(!host);
843 BUG_ON(!host->card);
844
845 for (i = 0;i < host->card->sdio_funcs;i++) {
846 if (host->card->sdio_func[i]) {
847 sdio_remove_func(host->card->sdio_func[i]);
848 host->card->sdio_func[i] = NULL;
849 }
850 }
851
852 mmc_remove_card(host->card);
853 host->card = NULL;
854}
855
856/*
857 * Card detection - card is alive.
858 */
859static int mmc_sdio_alive(struct mmc_host *host)
860{
861 return mmc_select_card(host->card);
862}
863
864/*
865 * Card detection callback from host.
866 */
867static void mmc_sdio_detect(struct mmc_host *host)
868{
869 int err;
870
871 BUG_ON(!host);
872 BUG_ON(!host->card);
873
874 /* Make sure card is powered before detecting it */
875 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
876 err = pm_runtime_get_sync(&host->card->dev);
877 if (err < 0) {
878 pm_runtime_put_noidle(&host->card->dev);
879 goto out;
880 }
881 }
882
883 mmc_claim_host(host);
884
885 /*
886 * Just check if our card has been removed.
887 */
888 err = _mmc_detect_card_removed(host);
889
890 mmc_release_host(host);
891
892 /*
893 * Tell PM core it's OK to power off the card now.
894 *
895 * The _sync variant is used in order to ensure that the card
896 * is left powered off in case an error occurred, and the card
897 * is going to be removed.
898 *
899 * Since there is no specific reason to believe a new user
900 * is about to show up at this point, the _sync variant is
901 * desirable anyway.
902 */
903 if (host->caps & MMC_CAP_POWER_OFF_CARD)
904 pm_runtime_put_sync(&host->card->dev);
905
906out:
907 if (err) {
908 mmc_sdio_remove(host);
909
910 mmc_claim_host(host);
911 mmc_detach_bus(host);
912 mmc_power_off(host);
913 mmc_release_host(host);
914 }
915}
916
917/*
918 * SDIO pre_suspend. We need to suspend all functions separately.
919 * Therefore all registered functions must have drivers with suspend
920 * and resume methods. Failing that we simply remove the whole card.
921 */
922static int mmc_sdio_pre_suspend(struct mmc_host *host)
923{
924 int i, err = 0;
925
926 for (i = 0; i < host->card->sdio_funcs; i++) {
927 struct sdio_func *func = host->card->sdio_func[i];
928 if (func && sdio_func_present(func) && func->dev.driver) {
929 const struct dev_pm_ops *pmops = func->dev.driver->pm;
930 if (!pmops || !pmops->suspend || !pmops->resume) {
931 /* force removal of entire card in that case */
932 err = -ENOSYS;
933 break;
934 }
935 }
936 }
937
938 return err;
939}
940
941/*
942 * SDIO suspend. Suspend all functions separately.
943 */
944static int mmc_sdio_suspend(struct mmc_host *host)
945{
946 int i, err = 0;
947
948 for (i = 0; i < host->card->sdio_funcs; i++) {
949 struct sdio_func *func = host->card->sdio_func[i];
950 if (func && sdio_func_present(func) && func->dev.driver) {
951 const struct dev_pm_ops *pmops = func->dev.driver->pm;
952 err = pmops->suspend(&func->dev);
953 if (err)
954 break;
955 }
956 }
957 while (err && --i >= 0) {
958 struct sdio_func *func = host->card->sdio_func[i];
959 if (func && sdio_func_present(func) && func->dev.driver) {
960 const struct dev_pm_ops *pmops = func->dev.driver->pm;
961 pmops->resume(&func->dev);
962 }
963 }
964
965 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
966 mmc_claim_host(host);
967 sdio_disable_wide(host->card);
968 mmc_release_host(host);
969 }
970
971 if (!err && !mmc_card_keep_power(host))
972 mmc_power_off(host);
973
974 return err;
975}
976
977static int mmc_sdio_resume(struct mmc_host *host)
978{
979 int i, err = 0;
980
981 BUG_ON(!host);
982 BUG_ON(!host->card);
983
984 /* Basic card reinitialization. */
985 mmc_claim_host(host);
986
987 /* Restore power if needed */
988 if (!mmc_card_keep_power(host)) {
989 mmc_power_up(host, host->card->ocr);
990 /*
991 * Tell runtime PM core we just powered up the card,
992 * since it still believes the card is powered off.
993 * Note that currently runtime PM is only enabled
994 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
995 */
996 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
997 pm_runtime_disable(&host->card->dev);
998 pm_runtime_set_active(&host->card->dev);
999 pm_runtime_enable(&host->card->dev);
1000 }
1001 }
1002
1003 /* No need to reinitialize powered-resumed nonremovable cards */
1004 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
1005 sdio_reset(host);
1006 mmc_go_idle(host);
1007 err = mmc_sdio_init_card(host, host->card->ocr, host->card,
1008 mmc_card_keep_power(host));
1009 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
1010 /* We may have switched to 1-bit mode during suspend */
1011 err = sdio_enable_4bit_bus(host->card);
1012 if (err > 0) {
1013 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1014 err = 0;
1015 }
1016 }
1017
1018 if (!err && host->sdio_irqs)
1019 wake_up_process(host->sdio_irq_thread);
1020 mmc_release_host(host);
1021
1022 /*
1023 * If the card looked to be the same as before suspending, then
1024 * we proceed to resume all card functions. If one of them returns
1025 * an error then we simply return that error to the core and the
1026 * card will be redetected as new. It is the responsibility of
1027 * the function driver to perform further tests with the extra
1028 * knowledge it has of the card to confirm the card is indeed the
1029 * same as before suspending (same MAC address for network cards,
1030 * etc.) and return an error otherwise.
1031 */
1032 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
1033 struct sdio_func *func = host->card->sdio_func[i];
1034 if (func && sdio_func_present(func) && func->dev.driver) {
1035 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1036 err = pmops->resume(&func->dev);
1037 }
1038 }
1039
1040 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1041 return err;
1042}
1043
1044static int mmc_sdio_power_restore(struct mmc_host *host)
1045{
1046 int ret;
1047
1048 BUG_ON(!host);
1049 BUG_ON(!host->card);
1050
1051 mmc_claim_host(host);
1052
1053 /*
1054 * Reset the card by performing the same steps that are taken by
1055 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1056 *
1057 * sdio_reset() is technically not needed. Having just powered up the
1058 * hardware, it should already be in reset state. However, some
1059 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1060 * meaning that a reset is required when restoring power soon after
1061 * powering off. It is harmless in other cases.
1062 *
1063 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1064 * is not necessary for non-removable cards. However, it is required
1065 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1066 * harmless in other situations.
1067 *
1068 */
1069
1070 sdio_reset(host);
1071 mmc_go_idle(host);
1072 mmc_send_if_cond(host, host->ocr_avail);
1073
1074 ret = mmc_send_io_op_cond(host, 0, NULL);
1075 if (ret)
1076 goto out;
1077
1078 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1079 mmc_card_keep_power(host));
1080 if (!ret && host->sdio_irqs)
1081 mmc_signal_sdio_irq(host);
1082
1083out:
1084 mmc_release_host(host);
1085
1086 return ret;
1087}
1088
1089static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1090{
1091 /* No references to the card, cut the power to it. */
1092 mmc_power_off(host);
1093 return 0;
1094}
1095
1096static int mmc_sdio_runtime_resume(struct mmc_host *host)
1097{
1098 /* Restore power and re-initialize. */
1099 mmc_power_up(host, host->card->ocr);
1100 return mmc_sdio_power_restore(host);
1101}
1102
1103static const struct mmc_bus_ops mmc_sdio_ops = {
1104 .remove = mmc_sdio_remove,
1105 .detect = mmc_sdio_detect,
1106 .pre_suspend = mmc_sdio_pre_suspend,
1107 .suspend = mmc_sdio_suspend,
1108 .resume = mmc_sdio_resume,
1109 .runtime_suspend = mmc_sdio_runtime_suspend,
1110 .runtime_resume = mmc_sdio_runtime_resume,
1111 .power_restore = mmc_sdio_power_restore,
1112 .alive = mmc_sdio_alive,
1113};
1114
1115
1116/*
1117 * Starting point for SDIO card init.
1118 */
1119int mmc_attach_sdio(struct mmc_host *host)
1120{
1121 int err, i, funcs;
1122 u32 ocr, rocr;
1123 struct mmc_card *card;
1124
1125 BUG_ON(!host);
1126 WARN_ON(!host->claimed);
1127
1128 err = mmc_send_io_op_cond(host, 0, &ocr);
1129 if (err)
1130 return err;
1131
1132 mmc_attach_bus(host, &mmc_sdio_ops);
1133 if (host->ocr_avail_sdio)
1134 host->ocr_avail = host->ocr_avail_sdio;
1135
1136
1137 rocr = mmc_select_voltage(host, ocr);
1138
1139 /*
1140 * Can we support the voltage(s) of the card(s)?
1141 */
1142 if (!rocr) {
1143 err = -EINVAL;
1144 goto err;
1145 }
1146
1147 /*
1148 * Detect and init the card.
1149 */
1150 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1151 if (err)
1152 goto err;
1153
1154 card = host->card;
1155
1156 /*
1157 * Enable runtime PM only if supported by host+card+board
1158 */
1159 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1160 /*
1161 * Let runtime PM core know our card is active
1162 */
1163 err = pm_runtime_set_active(&card->dev);
1164 if (err)
1165 goto remove;
1166
1167 /*
1168 * Enable runtime PM for this card
1169 */
1170 pm_runtime_enable(&card->dev);
1171 }
1172
1173 /*
1174 * The number of functions on the card is encoded inside
1175 * the ocr.
1176 */
1177 funcs = (ocr & 0x70000000) >> 28;
1178 card->sdio_funcs = 0;
1179
1180 /*
1181 * Initialize (but don't add) all present functions.
1182 */
1183 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1184 err = sdio_init_func(host->card, i + 1);
1185 if (err)
1186 goto remove;
1187
1188 /*
1189 * Enable Runtime PM for this func (if supported)
1190 */
1191 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1192 pm_runtime_enable(&card->sdio_func[i]->dev);
1193 }
1194
1195 /*
1196 * First add the card to the driver model...
1197 */
1198 mmc_release_host(host);
1199 err = mmc_add_card(host->card);
1200 if (err)
1201 goto remove_added;
1202
1203 /*
1204 * ...then the SDIO functions.
1205 */
1206 for (i = 0;i < funcs;i++) {
1207 err = sdio_add_func(host->card->sdio_func[i]);
1208 if (err)
1209 goto remove_added;
1210 }
1211
1212 mmc_claim_host(host);
1213 return 0;
1214
1215
1216remove_added:
1217 /* Remove without lock if the device has been added. */
1218 mmc_sdio_remove(host);
1219 mmc_claim_host(host);
1220remove:
1221 /* And with lock if it hasn't been added. */
1222 mmc_release_host(host);
1223 if (host->card)
1224 mmc_sdio_remove(host);
1225 mmc_claim_host(host);
1226err:
1227 mmc_detach_bus(host);
1228
1229 pr_err("%s: error %d whilst initialising SDIO card\n",
1230 mmc_hostname(host), err);
1231
1232 return err;
1233}
1234
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * linux/drivers/mmc/sdio.c
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8#include <linux/err.h>
9#include <linux/pm_runtime.h>
10
11#include <linux/mmc/host.h>
12#include <linux/mmc/card.h>
13#include <linux/mmc/mmc.h>
14#include <linux/mmc/sdio.h>
15#include <linux/mmc/sdio_func.h>
16#include <linux/mmc/sdio_ids.h>
17
18#include "core.h"
19#include "card.h"
20#include "host.h"
21#include "bus.h"
22#include "quirks.h"
23#include "sd.h"
24#include "sdio_bus.h"
25#include "mmc_ops.h"
26#include "sd_ops.h"
27#include "sdio_ops.h"
28#include "sdio_cis.h"
29
30MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
31MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
32MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
33MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
34
35static struct attribute *sdio_std_attrs[] = {
36 &dev_attr_vendor.attr,
37 &dev_attr_device.attr,
38 &dev_attr_ocr.attr,
39 &dev_attr_rca.attr,
40 NULL,
41};
42ATTRIBUTE_GROUPS(sdio_std);
43
44static struct device_type sdio_type = {
45 .groups = sdio_std_groups,
46};
47
48static int sdio_read_fbr(struct sdio_func *func)
49{
50 int ret;
51 unsigned char data;
52
53 if (mmc_card_nonstd_func_interface(func->card)) {
54 func->class = SDIO_CLASS_NONE;
55 return 0;
56 }
57
58 ret = mmc_io_rw_direct(func->card, 0, 0,
59 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
60 if (ret)
61 goto out;
62
63 data &= 0x0f;
64
65 if (data == 0x0f) {
66 ret = mmc_io_rw_direct(func->card, 0, 0,
67 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
68 if (ret)
69 goto out;
70 }
71
72 func->class = data;
73
74out:
75 return ret;
76}
77
78static int sdio_init_func(struct mmc_card *card, unsigned int fn)
79{
80 int ret;
81 struct sdio_func *func;
82
83 if (WARN_ON(fn > SDIO_MAX_FUNCS))
84 return -EINVAL;
85
86 func = sdio_alloc_func(card);
87 if (IS_ERR(func))
88 return PTR_ERR(func);
89
90 func->num = fn;
91
92 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
93 ret = sdio_read_fbr(func);
94 if (ret)
95 goto fail;
96
97 ret = sdio_read_func_cis(func);
98 if (ret)
99 goto fail;
100 } else {
101 func->vendor = func->card->cis.vendor;
102 func->device = func->card->cis.device;
103 func->max_blksize = func->card->cis.blksize;
104 }
105
106 card->sdio_func[fn - 1] = func;
107
108 return 0;
109
110fail:
111 /*
112 * It is okay to remove the function here even though we hold
113 * the host lock as we haven't registered the device yet.
114 */
115 sdio_remove_func(func);
116 return ret;
117}
118
119static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
120{
121 int ret;
122 int cccr_vsn;
123 int uhs = ocr & R4_18V_PRESENT;
124 unsigned char data;
125 unsigned char speed;
126
127 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
128 if (ret)
129 goto out;
130
131 cccr_vsn = data & 0x0f;
132
133 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
134 pr_err("%s: unrecognised CCCR structure version %d\n",
135 mmc_hostname(card->host), cccr_vsn);
136 return -EINVAL;
137 }
138
139 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
140
141 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
142 if (ret)
143 goto out;
144
145 if (data & SDIO_CCCR_CAP_SMB)
146 card->cccr.multi_block = 1;
147 if (data & SDIO_CCCR_CAP_LSC)
148 card->cccr.low_speed = 1;
149 if (data & SDIO_CCCR_CAP_4BLS)
150 card->cccr.wide_bus = 1;
151
152 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
153 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
154 if (ret)
155 goto out;
156
157 if (data & SDIO_POWER_SMPC)
158 card->cccr.high_power = 1;
159 }
160
161 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
162 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
163 if (ret)
164 goto out;
165
166 card->scr.sda_spec3 = 0;
167 card->sw_caps.sd3_bus_mode = 0;
168 card->sw_caps.sd3_drv_type = 0;
169 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
170 card->scr.sda_spec3 = 1;
171 ret = mmc_io_rw_direct(card, 0, 0,
172 SDIO_CCCR_UHS, 0, &data);
173 if (ret)
174 goto out;
175
176 if (mmc_host_uhs(card->host)) {
177 if (data & SDIO_UHS_DDR50)
178 card->sw_caps.sd3_bus_mode
179 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
180 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
181
182 if (data & SDIO_UHS_SDR50)
183 card->sw_caps.sd3_bus_mode
184 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
185 | SD_MODE_UHS_SDR12;
186
187 if (data & SDIO_UHS_SDR104)
188 card->sw_caps.sd3_bus_mode
189 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
190 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
191 }
192
193 ret = mmc_io_rw_direct(card, 0, 0,
194 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
195 if (ret)
196 goto out;
197
198 if (data & SDIO_DRIVE_SDTA)
199 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
200 if (data & SDIO_DRIVE_SDTC)
201 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
202 if (data & SDIO_DRIVE_SDTD)
203 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
204 }
205
206 /* if no uhs mode ensure we check for high speed */
207 if (!card->sw_caps.sd3_bus_mode) {
208 if (speed & SDIO_SPEED_SHS) {
209 card->cccr.high_speed = 1;
210 card->sw_caps.hs_max_dtr = 50000000;
211 } else {
212 card->cccr.high_speed = 0;
213 card->sw_caps.hs_max_dtr = 25000000;
214 }
215 }
216 }
217
218out:
219 return ret;
220}
221
222static int sdio_enable_wide(struct mmc_card *card)
223{
224 int ret;
225 u8 ctrl;
226
227 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
228 return 0;
229
230 if (card->cccr.low_speed && !card->cccr.wide_bus)
231 return 0;
232
233 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
234 if (ret)
235 return ret;
236
237 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
238 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
239 mmc_hostname(card->host), ctrl);
240
241 /* set as 4-bit bus width */
242 ctrl &= ~SDIO_BUS_WIDTH_MASK;
243 ctrl |= SDIO_BUS_WIDTH_4BIT;
244
245 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
246 if (ret)
247 return ret;
248
249 return 1;
250}
251
252/*
253 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
254 * of the card. This may be required on certain setups of boards,
255 * controllers and embedded sdio device which do not need the card's
256 * pull-up. As a result, card detection is disabled and power is saved.
257 */
258static int sdio_disable_cd(struct mmc_card *card)
259{
260 int ret;
261 u8 ctrl;
262
263 if (!mmc_card_disable_cd(card))
264 return 0;
265
266 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
267 if (ret)
268 return ret;
269
270 ctrl |= SDIO_BUS_CD_DISABLE;
271
272 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
273}
274
275/*
276 * Devices that remain active during a system suspend are
277 * put back into 1-bit mode.
278 */
279static int sdio_disable_wide(struct mmc_card *card)
280{
281 int ret;
282 u8 ctrl;
283
284 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
285 return 0;
286
287 if (card->cccr.low_speed && !card->cccr.wide_bus)
288 return 0;
289
290 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
291 if (ret)
292 return ret;
293
294 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
295 return 0;
296
297 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
298 ctrl |= SDIO_BUS_ASYNC_INT;
299
300 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
301 if (ret)
302 return ret;
303
304 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
305
306 return 0;
307}
308
309static int sdio_disable_4bit_bus(struct mmc_card *card)
310{
311 int err;
312
313 if (card->type == MMC_TYPE_SDIO)
314 goto out;
315
316 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
317 return 0;
318
319 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
320 return 0;
321
322 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
323 if (err)
324 return err;
325
326out:
327 return sdio_disable_wide(card);
328}
329
330
331static int sdio_enable_4bit_bus(struct mmc_card *card)
332{
333 int err;
334
335 err = sdio_enable_wide(card);
336 if (err <= 0)
337 return err;
338 if (card->type == MMC_TYPE_SDIO)
339 goto out;
340
341 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
342 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
343 if (err) {
344 sdio_disable_wide(card);
345 return err;
346 }
347 }
348out:
349 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
350
351 return 0;
352}
353
354
355/*
356 * Test if the card supports high-speed mode and, if so, switch to it.
357 */
358static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
359{
360 int ret;
361 u8 speed;
362
363 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
364 return 0;
365
366 if (!card->cccr.high_speed)
367 return 0;
368
369 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
370 if (ret)
371 return ret;
372
373 if (enable)
374 speed |= SDIO_SPEED_EHS;
375 else
376 speed &= ~SDIO_SPEED_EHS;
377
378 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
379 if (ret)
380 return ret;
381
382 return 1;
383}
384
385/*
386 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
387 */
388static int sdio_enable_hs(struct mmc_card *card)
389{
390 int ret;
391
392 ret = mmc_sdio_switch_hs(card, true);
393 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
394 return ret;
395
396 ret = mmc_sd_switch_hs(card);
397 if (ret <= 0)
398 mmc_sdio_switch_hs(card, false);
399
400 return ret;
401}
402
403static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
404{
405 unsigned max_dtr;
406
407 if (mmc_card_hs(card)) {
408 /*
409 * The SDIO specification doesn't mention how
410 * the CIS transfer speed register relates to
411 * high-speed, but it seems that 50 MHz is
412 * mandatory.
413 */
414 max_dtr = 50000000;
415 } else {
416 max_dtr = card->cis.max_dtr;
417 }
418
419 if (card->type == MMC_TYPE_SD_COMBO)
420 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
421
422 return max_dtr;
423}
424
425static unsigned char host_drive_to_sdio_drive(int host_strength)
426{
427 switch (host_strength) {
428 case MMC_SET_DRIVER_TYPE_A:
429 return SDIO_DTSx_SET_TYPE_A;
430 case MMC_SET_DRIVER_TYPE_B:
431 return SDIO_DTSx_SET_TYPE_B;
432 case MMC_SET_DRIVER_TYPE_C:
433 return SDIO_DTSx_SET_TYPE_C;
434 case MMC_SET_DRIVER_TYPE_D:
435 return SDIO_DTSx_SET_TYPE_D;
436 default:
437 return SDIO_DTSx_SET_TYPE_B;
438 }
439}
440
441static void sdio_select_driver_type(struct mmc_card *card)
442{
443 int card_drv_type, drive_strength, drv_type;
444 unsigned char card_strength;
445 int err;
446
447 card->drive_strength = 0;
448
449 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
450
451 drive_strength = mmc_select_drive_strength(card,
452 card->sw_caps.uhs_max_dtr,
453 card_drv_type, &drv_type);
454
455 if (drive_strength) {
456 /* if error just use default for drive strength B */
457 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
458 &card_strength);
459 if (err)
460 return;
461
462 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
463 card_strength |= host_drive_to_sdio_drive(drive_strength);
464
465 /* if error default to drive strength B */
466 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
467 card_strength, NULL);
468 if (err)
469 return;
470 card->drive_strength = drive_strength;
471 }
472
473 if (drv_type)
474 mmc_set_driver_type(card->host, drv_type);
475}
476
477
478static int sdio_set_bus_speed_mode(struct mmc_card *card)
479{
480 unsigned int bus_speed, timing;
481 int err;
482 unsigned char speed;
483 unsigned int max_rate;
484
485 /*
486 * If the host doesn't support any of the UHS-I modes, fallback on
487 * default speed.
488 */
489 if (!mmc_host_uhs(card->host))
490 return 0;
491
492 bus_speed = SDIO_SPEED_SDR12;
493 timing = MMC_TIMING_UHS_SDR12;
494 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
495 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
496 bus_speed = SDIO_SPEED_SDR104;
497 timing = MMC_TIMING_UHS_SDR104;
498 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
499 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
500 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
501 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
502 bus_speed = SDIO_SPEED_DDR50;
503 timing = MMC_TIMING_UHS_DDR50;
504 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
505 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
506 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
507 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
508 SD_MODE_UHS_SDR50)) {
509 bus_speed = SDIO_SPEED_SDR50;
510 timing = MMC_TIMING_UHS_SDR50;
511 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
512 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
513 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
514 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
515 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
516 bus_speed = SDIO_SPEED_SDR25;
517 timing = MMC_TIMING_UHS_SDR25;
518 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
519 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
520 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
521 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
522 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
523 SD_MODE_UHS_SDR12)) {
524 bus_speed = SDIO_SPEED_SDR12;
525 timing = MMC_TIMING_UHS_SDR12;
526 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
527 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
528 }
529
530 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
531 if (err)
532 return err;
533
534 speed &= ~SDIO_SPEED_BSS_MASK;
535 speed |= bus_speed;
536 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
537 if (err)
538 return err;
539
540 max_rate = min_not_zero(card->quirk_max_rate,
541 card->sw_caps.uhs_max_dtr);
542
543 mmc_set_timing(card->host, timing);
544 mmc_set_clock(card->host, max_rate);
545
546 return 0;
547}
548
549/*
550 * UHS-I specific initialization procedure
551 */
552static int mmc_sdio_init_uhs_card(struct mmc_card *card)
553{
554 int err;
555
556 if (!card->scr.sda_spec3)
557 return 0;
558
559 /* Switch to wider bus */
560 err = sdio_enable_4bit_bus(card);
561 if (err)
562 goto out;
563
564 /* Set the driver strength for the card */
565 sdio_select_driver_type(card);
566
567 /* Set bus speed mode of the card */
568 err = sdio_set_bus_speed_mode(card);
569 if (err)
570 goto out;
571
572 /*
573 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
574 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
575 */
576 if (!mmc_host_is_spi(card->host) &&
577 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
578 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
579 err = mmc_execute_tuning(card);
580out:
581 return err;
582}
583
584static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
585 struct mmc_card *card)
586{
587 if (card)
588 mmc_remove_card(card);
589
590 /*
591 * Reset the card by performing the same steps that are taken by
592 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
593 *
594 * sdio_reset() is technically not needed. Having just powered up the
595 * hardware, it should already be in reset state. However, some
596 * platforms (such as SD8686 on OLPC) do not instantly cut power,
597 * meaning that a reset is required when restoring power soon after
598 * powering off. It is harmless in other cases.
599 *
600 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
601 * is not necessary for non-removable cards. However, it is required
602 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
603 * harmless in other situations.
604 *
605 */
606
607 sdio_reset(host);
608 mmc_go_idle(host);
609 mmc_send_if_cond(host, ocr);
610 return mmc_send_io_op_cond(host, 0, NULL);
611}
612
613/*
614 * Handle the detection and initialisation of a card.
615 *
616 * In the case of a resume, "oldcard" will contain the card
617 * we're trying to reinitialise.
618 */
619static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
620 struct mmc_card *oldcard)
621{
622 struct mmc_card *card;
623 int err;
624 int retries = 10;
625 u32 rocr = 0;
626 u32 ocr_card = ocr;
627
628 WARN_ON(!host->claimed);
629
630 /* to query card if 1.8V signalling is supported */
631 if (mmc_host_uhs(host))
632 ocr |= R4_18V_PRESENT;
633
634try_again:
635 if (!retries) {
636 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
637 ocr &= ~R4_18V_PRESENT;
638 }
639
640 /*
641 * Inform the card of the voltage
642 */
643 err = mmc_send_io_op_cond(host, ocr, &rocr);
644 if (err)
645 return err;
646
647 /*
648 * For SPI, enable CRC as appropriate.
649 */
650 if (mmc_host_is_spi(host)) {
651 err = mmc_spi_set_crc(host, use_spi_crc);
652 if (err)
653 return err;
654 }
655
656 /*
657 * Allocate card structure.
658 */
659 card = mmc_alloc_card(host, &sdio_type);
660 if (IS_ERR(card))
661 return PTR_ERR(card);
662
663 if ((rocr & R4_MEMORY_PRESENT) &&
664 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
665 card->type = MMC_TYPE_SD_COMBO;
666
667 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
668 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
669 err = -ENOENT;
670 goto mismatch;
671 }
672 } else {
673 card->type = MMC_TYPE_SDIO;
674
675 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
676 err = -ENOENT;
677 goto mismatch;
678 }
679 }
680
681 /*
682 * Call the optional HC's init_card function to handle quirks.
683 */
684 if (host->ops->init_card)
685 host->ops->init_card(host, card);
686
687 /*
688 * If the host and card support UHS-I mode request the card
689 * to switch to 1.8V signaling level. No 1.8v signalling if
690 * UHS mode is not enabled to maintain compatibility and some
691 * systems that claim 1.8v signalling in fact do not support
692 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
693 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
694 * fails to check rocr & R4_18V_PRESENT, but we still need to
695 * try to init uhs card. sdio_read_cccr will take over this task
696 * to make sure which speed mode should work.
697 */
698 if (rocr & ocr & R4_18V_PRESENT) {
699 err = mmc_set_uhs_voltage(host, ocr_card);
700 if (err == -EAGAIN) {
701 mmc_sdio_pre_init(host, ocr_card, card);
702 retries--;
703 goto try_again;
704 } else if (err) {
705 ocr &= ~R4_18V_PRESENT;
706 }
707 }
708
709 /*
710 * For native busses: set card RCA and quit open drain mode.
711 */
712 if (!mmc_host_is_spi(host)) {
713 err = mmc_send_relative_addr(host, &card->rca);
714 if (err)
715 goto remove;
716
717 /*
718 * Update oldcard with the new RCA received from the SDIO
719 * device -- we're doing this so that it's updated in the
720 * "card" struct when oldcard overwrites that later.
721 */
722 if (oldcard)
723 oldcard->rca = card->rca;
724 }
725
726 /*
727 * Read CSD, before selecting the card
728 */
729 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
730 err = mmc_sd_get_csd(host, card);
731 if (err)
732 goto remove;
733
734 mmc_decode_cid(card);
735 }
736
737 /*
738 * Select card, as all following commands rely on that.
739 */
740 if (!mmc_host_is_spi(host)) {
741 err = mmc_select_card(card);
742 if (err)
743 goto remove;
744 }
745
746 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
747 /*
748 * This is non-standard SDIO device, meaning it doesn't
749 * have any CIA (Common I/O area) registers present.
750 * It's host's responsibility to fill cccr and cis
751 * structures in init_card().
752 */
753 mmc_set_clock(host, card->cis.max_dtr);
754
755 if (card->cccr.high_speed) {
756 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
757 }
758
759 if (oldcard)
760 mmc_remove_card(card);
761 else
762 host->card = card;
763
764 return 0;
765 }
766
767 /*
768 * Read the common registers. Note that we should try to
769 * validate whether UHS would work or not.
770 */
771 err = sdio_read_cccr(card, ocr);
772 if (err) {
773 mmc_sdio_pre_init(host, ocr_card, card);
774 if (ocr & R4_18V_PRESENT) {
775 /* Retry init sequence, but without R4_18V_PRESENT. */
776 retries = 0;
777 goto try_again;
778 }
779 return err;
780 }
781
782 /*
783 * Read the common CIS tuples.
784 */
785 err = sdio_read_common_cis(card);
786 if (err)
787 goto remove;
788
789 if (oldcard) {
790 if (card->cis.vendor == oldcard->cis.vendor &&
791 card->cis.device == oldcard->cis.device) {
792 mmc_remove_card(card);
793 card = oldcard;
794 } else {
795 err = -ENOENT;
796 goto mismatch;
797 }
798 }
799 card->ocr = ocr_card;
800 mmc_fixup_device(card, sdio_fixup_methods);
801
802 if (card->type == MMC_TYPE_SD_COMBO) {
803 err = mmc_sd_setup_card(host, card, oldcard != NULL);
804 /* handle as SDIO-only card if memory init failed */
805 if (err) {
806 mmc_go_idle(host);
807 if (mmc_host_is_spi(host))
808 /* should not fail, as it worked previously */
809 mmc_spi_set_crc(host, use_spi_crc);
810 card->type = MMC_TYPE_SDIO;
811 } else
812 card->dev.type = &sd_type;
813 }
814
815 /*
816 * If needed, disconnect card detection pull-up resistor.
817 */
818 err = sdio_disable_cd(card);
819 if (err)
820 goto remove;
821
822 /* Initialization sequence for UHS-I cards */
823 /* Only if card supports 1.8v and UHS signaling */
824 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
825 err = mmc_sdio_init_uhs_card(card);
826 if (err)
827 goto remove;
828 } else {
829 /*
830 * Switch to high-speed (if supported).
831 */
832 err = sdio_enable_hs(card);
833 if (err > 0)
834 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
835 else if (err)
836 goto remove;
837
838 /*
839 * Change to the card's maximum speed.
840 */
841 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
842
843 /*
844 * Switch to wider bus (if supported).
845 */
846 err = sdio_enable_4bit_bus(card);
847 if (err)
848 goto remove;
849 }
850
851 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
852 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
853 pr_err("%s: Host failed to negotiate down from 3.3V\n",
854 mmc_hostname(host));
855 err = -EINVAL;
856 goto remove;
857 }
858
859 host->card = card;
860 return 0;
861
862mismatch:
863 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
864remove:
865 if (oldcard != card)
866 mmc_remove_card(card);
867 return err;
868}
869
870static int mmc_sdio_reinit_card(struct mmc_host *host)
871{
872 int ret;
873
874 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
875 if (ret)
876 return ret;
877
878 return mmc_sdio_init_card(host, host->card->ocr, host->card);
879}
880
881/*
882 * Host is being removed. Free up the current card.
883 */
884static void mmc_sdio_remove(struct mmc_host *host)
885{
886 int i;
887
888 for (i = 0;i < host->card->sdio_funcs;i++) {
889 if (host->card->sdio_func[i]) {
890 sdio_remove_func(host->card->sdio_func[i]);
891 host->card->sdio_func[i] = NULL;
892 }
893 }
894
895 mmc_remove_card(host->card);
896 host->card = NULL;
897}
898
899/*
900 * Card detection - card is alive.
901 */
902static int mmc_sdio_alive(struct mmc_host *host)
903{
904 return mmc_select_card(host->card);
905}
906
907/*
908 * Card detection callback from host.
909 */
910static void mmc_sdio_detect(struct mmc_host *host)
911{
912 int err;
913
914 /* Make sure card is powered before detecting it */
915 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
916 err = pm_runtime_get_sync(&host->card->dev);
917 if (err < 0) {
918 pm_runtime_put_noidle(&host->card->dev);
919 goto out;
920 }
921 }
922
923 mmc_claim_host(host);
924
925 /*
926 * Just check if our card has been removed.
927 */
928 err = _mmc_detect_card_removed(host);
929
930 mmc_release_host(host);
931
932 /*
933 * Tell PM core it's OK to power off the card now.
934 *
935 * The _sync variant is used in order to ensure that the card
936 * is left powered off in case an error occurred, and the card
937 * is going to be removed.
938 *
939 * Since there is no specific reason to believe a new user
940 * is about to show up at this point, the _sync variant is
941 * desirable anyway.
942 */
943 if (host->caps & MMC_CAP_POWER_OFF_CARD)
944 pm_runtime_put_sync(&host->card->dev);
945
946out:
947 if (err) {
948 mmc_sdio_remove(host);
949
950 mmc_claim_host(host);
951 mmc_detach_bus(host);
952 mmc_power_off(host);
953 mmc_release_host(host);
954 }
955}
956
957/*
958 * SDIO pre_suspend. We need to suspend all functions separately.
959 * Therefore all registered functions must have drivers with suspend
960 * and resume methods. Failing that we simply remove the whole card.
961 */
962static int mmc_sdio_pre_suspend(struct mmc_host *host)
963{
964 int i, err = 0;
965
966 for (i = 0; i < host->card->sdio_funcs; i++) {
967 struct sdio_func *func = host->card->sdio_func[i];
968 if (func && sdio_func_present(func) && func->dev.driver) {
969 const struct dev_pm_ops *pmops = func->dev.driver->pm;
970 if (!pmops || !pmops->suspend || !pmops->resume) {
971 /* force removal of entire card in that case */
972 err = -ENOSYS;
973 break;
974 }
975 }
976 }
977
978 return err;
979}
980
981/*
982 * SDIO suspend. Suspend all functions separately.
983 */
984static int mmc_sdio_suspend(struct mmc_host *host)
985{
986 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
987
988 /* Prevent processing of SDIO IRQs in suspended state. */
989 mmc_card_set_suspended(host->card);
990 cancel_delayed_work_sync(&host->sdio_irq_work);
991
992 mmc_claim_host(host);
993
994 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
995 sdio_disable_4bit_bus(host->card);
996
997 if (!mmc_card_keep_power(host)) {
998 mmc_power_off(host);
999 } else if (host->retune_period) {
1000 mmc_retune_timer_stop(host);
1001 mmc_retune_needed(host);
1002 }
1003
1004 mmc_release_host(host);
1005
1006 return 0;
1007}
1008
1009static int mmc_sdio_resume(struct mmc_host *host)
1010{
1011 int err = 0;
1012
1013 /* Basic card reinitialization. */
1014 mmc_claim_host(host);
1015
1016 /*
1017 * Restore power and reinitialize the card when needed. Note that a
1018 * removable card is checked from a detect work later on in the resume
1019 * process.
1020 */
1021 if (!mmc_card_keep_power(host)) {
1022 mmc_power_up(host, host->card->ocr);
1023 /*
1024 * Tell runtime PM core we just powered up the card,
1025 * since it still believes the card is powered off.
1026 * Note that currently runtime PM is only enabled
1027 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1028 */
1029 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1030 pm_runtime_disable(&host->card->dev);
1031 pm_runtime_set_active(&host->card->dev);
1032 pm_runtime_enable(&host->card->dev);
1033 }
1034 err = mmc_sdio_reinit_card(host);
1035 } else if (mmc_card_wake_sdio_irq(host)) {
1036 /* We may have switched to 1-bit mode during suspend */
1037 err = sdio_enable_4bit_bus(host->card);
1038 }
1039
1040 if (err)
1041 goto out;
1042
1043 /* Allow SDIO IRQs to be processed again. */
1044 mmc_card_clr_suspended(host->card);
1045
1046 if (host->sdio_irqs) {
1047 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1048 wake_up_process(host->sdio_irq_thread);
1049 else if (host->caps & MMC_CAP_SDIO_IRQ)
1050 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1051 }
1052
1053out:
1054 mmc_release_host(host);
1055
1056 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1057 return err;
1058}
1059
1060static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1061{
1062 /* No references to the card, cut the power to it. */
1063 mmc_claim_host(host);
1064 mmc_power_off(host);
1065 mmc_release_host(host);
1066
1067 return 0;
1068}
1069
1070static int mmc_sdio_runtime_resume(struct mmc_host *host)
1071{
1072 int ret;
1073
1074 /* Restore power and re-initialize. */
1075 mmc_claim_host(host);
1076 mmc_power_up(host, host->card->ocr);
1077 ret = mmc_sdio_reinit_card(host);
1078 mmc_release_host(host);
1079
1080 return ret;
1081}
1082
1083/*
1084 * SDIO HW reset
1085 *
1086 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1087 * reset was asynchronously scheduled, else a negative error code.
1088 */
1089static int mmc_sdio_hw_reset(struct mmc_host *host)
1090{
1091 struct mmc_card *card = host->card;
1092
1093 /*
1094 * In case the card is shared among multiple func drivers, reset the
1095 * card through a rescan work. In this way it will be removed and
1096 * re-detected, thus all func drivers becomes informed about it.
1097 */
1098 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1099 if (mmc_card_removed(card))
1100 return 1;
1101 host->rescan_entered = 0;
1102 mmc_card_set_removed(card);
1103 _mmc_detect_change(host, 0, false);
1104 return 1;
1105 }
1106
1107 /*
1108 * A single func driver has been probed, then let's skip the heavy
1109 * hotplug dance above and execute the reset immediately.
1110 */
1111 mmc_power_cycle(host, card->ocr);
1112 return mmc_sdio_reinit_card(host);
1113}
1114
1115static int mmc_sdio_sw_reset(struct mmc_host *host)
1116{
1117 mmc_set_clock(host, host->f_init);
1118 sdio_reset(host);
1119 mmc_go_idle(host);
1120
1121 mmc_set_initial_state(host);
1122 mmc_set_initial_signal_voltage(host);
1123
1124 return mmc_sdio_reinit_card(host);
1125}
1126
1127static const struct mmc_bus_ops mmc_sdio_ops = {
1128 .remove = mmc_sdio_remove,
1129 .detect = mmc_sdio_detect,
1130 .pre_suspend = mmc_sdio_pre_suspend,
1131 .suspend = mmc_sdio_suspend,
1132 .resume = mmc_sdio_resume,
1133 .runtime_suspend = mmc_sdio_runtime_suspend,
1134 .runtime_resume = mmc_sdio_runtime_resume,
1135 .alive = mmc_sdio_alive,
1136 .hw_reset = mmc_sdio_hw_reset,
1137 .sw_reset = mmc_sdio_sw_reset,
1138};
1139
1140
1141/*
1142 * Starting point for SDIO card init.
1143 */
1144int mmc_attach_sdio(struct mmc_host *host)
1145{
1146 int err, i, funcs;
1147 u32 ocr, rocr;
1148 struct mmc_card *card;
1149
1150 WARN_ON(!host->claimed);
1151
1152 err = mmc_send_io_op_cond(host, 0, &ocr);
1153 if (err)
1154 return err;
1155
1156 mmc_attach_bus(host, &mmc_sdio_ops);
1157 if (host->ocr_avail_sdio)
1158 host->ocr_avail = host->ocr_avail_sdio;
1159
1160
1161 rocr = mmc_select_voltage(host, ocr);
1162
1163 /*
1164 * Can we support the voltage(s) of the card(s)?
1165 */
1166 if (!rocr) {
1167 err = -EINVAL;
1168 goto err;
1169 }
1170
1171 /*
1172 * Detect and init the card.
1173 */
1174 err = mmc_sdio_init_card(host, rocr, NULL);
1175 if (err)
1176 goto err;
1177
1178 card = host->card;
1179
1180 /*
1181 * Enable runtime PM only if supported by host+card+board
1182 */
1183 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1184 /*
1185 * Do not allow runtime suspend until after SDIO function
1186 * devices are added.
1187 */
1188 pm_runtime_get_noresume(&card->dev);
1189
1190 /*
1191 * Let runtime PM core know our card is active
1192 */
1193 err = pm_runtime_set_active(&card->dev);
1194 if (err)
1195 goto remove;
1196
1197 /*
1198 * Enable runtime PM for this card
1199 */
1200 pm_runtime_enable(&card->dev);
1201 }
1202
1203 /*
1204 * The number of functions on the card is encoded inside
1205 * the ocr.
1206 */
1207 funcs = (ocr & 0x70000000) >> 28;
1208 card->sdio_funcs = 0;
1209
1210 /*
1211 * Initialize (but don't add) all present functions.
1212 */
1213 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1214 err = sdio_init_func(host->card, i + 1);
1215 if (err)
1216 goto remove;
1217
1218 /*
1219 * Enable Runtime PM for this func (if supported)
1220 */
1221 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1222 pm_runtime_enable(&card->sdio_func[i]->dev);
1223 }
1224
1225 /*
1226 * First add the card to the driver model...
1227 */
1228 mmc_release_host(host);
1229 err = mmc_add_card(host->card);
1230 if (err)
1231 goto remove_added;
1232
1233 /*
1234 * ...then the SDIO functions.
1235 */
1236 for (i = 0;i < funcs;i++) {
1237 err = sdio_add_func(host->card->sdio_func[i]);
1238 if (err)
1239 goto remove_added;
1240 }
1241
1242 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1243 pm_runtime_put(&card->dev);
1244
1245 mmc_claim_host(host);
1246 return 0;
1247
1248
1249remove:
1250 mmc_release_host(host);
1251remove_added:
1252 /*
1253 * The devices are being deleted so it is not necessary to disable
1254 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1255 * because it needs to be active to remove any function devices that
1256 * were probed, and after that it gets deleted.
1257 */
1258 mmc_sdio_remove(host);
1259 mmc_claim_host(host);
1260err:
1261 mmc_detach_bus(host);
1262
1263 pr_err("%s: error %d whilst initialising SDIO card\n",
1264 mmc_hostname(host), err);
1265
1266 return err;
1267}
1268