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