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1/*
2 * linux/drivers/mmc/sdio.c
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/err.h>
13#include <linux/pm_runtime.h>
14
15#include <linux/mmc/host.h>
16#include <linux/mmc/card.h>
17#include <linux/mmc/mmc.h>
18#include <linux/mmc/sdio.h>
19#include <linux/mmc/sdio_func.h>
20#include <linux/mmc/sdio_ids.h>
21
22#include "core.h"
23#include "bus.h"
24#include "sd.h"
25#include "sdio_bus.h"
26#include "mmc_ops.h"
27#include "sd_ops.h"
28#include "sdio_ops.h"
29#include "sdio_cis.h"
30
31static int sdio_read_fbr(struct sdio_func *func)
32{
33 int ret;
34 unsigned char data;
35
36 if (mmc_card_nonstd_func_interface(func->card)) {
37 func->class = SDIO_CLASS_NONE;
38 return 0;
39 }
40
41 ret = mmc_io_rw_direct(func->card, 0, 0,
42 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
43 if (ret)
44 goto out;
45
46 data &= 0x0f;
47
48 if (data == 0x0f) {
49 ret = mmc_io_rw_direct(func->card, 0, 0,
50 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
51 if (ret)
52 goto out;
53 }
54
55 func->class = data;
56
57out:
58 return ret;
59}
60
61static int sdio_init_func(struct mmc_card *card, unsigned int fn)
62{
63 int ret;
64 struct sdio_func *func;
65
66 BUG_ON(fn > SDIO_MAX_FUNCS);
67
68 func = sdio_alloc_func(card);
69 if (IS_ERR(func))
70 return PTR_ERR(func);
71
72 func->num = fn;
73
74 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
75 ret = sdio_read_fbr(func);
76 if (ret)
77 goto fail;
78
79 ret = sdio_read_func_cis(func);
80 if (ret)
81 goto fail;
82 } else {
83 func->vendor = func->card->cis.vendor;
84 func->device = func->card->cis.device;
85 func->max_blksize = func->card->cis.blksize;
86 }
87
88 card->sdio_func[fn - 1] = func;
89
90 return 0;
91
92fail:
93 /*
94 * It is okay to remove the function here even though we hold
95 * the host lock as we haven't registered the device yet.
96 */
97 sdio_remove_func(func);
98 return ret;
99}
100
101static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
102{
103 int ret;
104 int cccr_vsn;
105 int uhs = ocr & R4_18V_PRESENT;
106 unsigned char data;
107 unsigned char speed;
108
109 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
110
111 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
112 if (ret)
113 goto out;
114
115 cccr_vsn = data & 0x0f;
116
117 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
118 pr_err("%s: unrecognised CCCR structure version %d\n",
119 mmc_hostname(card->host), cccr_vsn);
120 return -EINVAL;
121 }
122
123 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
124
125 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
126 if (ret)
127 goto out;
128
129 if (data & SDIO_CCCR_CAP_SMB)
130 card->cccr.multi_block = 1;
131 if (data & SDIO_CCCR_CAP_LSC)
132 card->cccr.low_speed = 1;
133 if (data & SDIO_CCCR_CAP_4BLS)
134 card->cccr.wide_bus = 1;
135
136 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
137 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
138 if (ret)
139 goto out;
140
141 if (data & SDIO_POWER_SMPC)
142 card->cccr.high_power = 1;
143 }
144
145 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
146 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
147 if (ret)
148 goto out;
149
150 card->scr.sda_spec3 = 0;
151 card->sw_caps.sd3_bus_mode = 0;
152 card->sw_caps.sd3_drv_type = 0;
153 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
154 card->scr.sda_spec3 = 1;
155 ret = mmc_io_rw_direct(card, 0, 0,
156 SDIO_CCCR_UHS, 0, &data);
157 if (ret)
158 goto out;
159
160 if (card->host->caps &
161 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
162 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
163 MMC_CAP_UHS_DDR50)) {
164 if (data & SDIO_UHS_DDR50)
165 card->sw_caps.sd3_bus_mode
166 |= SD_MODE_UHS_DDR50;
167
168 if (data & SDIO_UHS_SDR50)
169 card->sw_caps.sd3_bus_mode
170 |= SD_MODE_UHS_SDR50;
171
172 if (data & SDIO_UHS_SDR104)
173 card->sw_caps.sd3_bus_mode
174 |= SD_MODE_UHS_SDR104;
175 }
176
177 ret = mmc_io_rw_direct(card, 0, 0,
178 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
179 if (ret)
180 goto out;
181
182 if (data & SDIO_DRIVE_SDTA)
183 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
184 if (data & SDIO_DRIVE_SDTC)
185 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
186 if (data & SDIO_DRIVE_SDTD)
187 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
188 }
189
190 /* if no uhs mode ensure we check for high speed */
191 if (!card->sw_caps.sd3_bus_mode) {
192 if (speed & SDIO_SPEED_SHS) {
193 card->cccr.high_speed = 1;
194 card->sw_caps.hs_max_dtr = 50000000;
195 } else {
196 card->cccr.high_speed = 0;
197 card->sw_caps.hs_max_dtr = 25000000;
198 }
199 }
200 }
201
202out:
203 return ret;
204}
205
206static int sdio_enable_wide(struct mmc_card *card)
207{
208 int ret;
209 u8 ctrl;
210
211 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
212 return 0;
213
214 if (card->cccr.low_speed && !card->cccr.wide_bus)
215 return 0;
216
217 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
218 if (ret)
219 return ret;
220
221 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
222 pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
223 mmc_hostname(card->host), ctrl);
224
225 /* set as 4-bit bus width */
226 ctrl &= ~SDIO_BUS_WIDTH_MASK;
227 ctrl |= SDIO_BUS_WIDTH_4BIT;
228
229 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
230 if (ret)
231 return ret;
232
233 return 1;
234}
235
236/*
237 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
238 * of the card. This may be required on certain setups of boards,
239 * controllers and embedded sdio device which do not need the card's
240 * pull-up. As a result, card detection is disabled and power is saved.
241 */
242static int sdio_disable_cd(struct mmc_card *card)
243{
244 int ret;
245 u8 ctrl;
246
247 if (!mmc_card_disable_cd(card))
248 return 0;
249
250 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
251 if (ret)
252 return ret;
253
254 ctrl |= SDIO_BUS_CD_DISABLE;
255
256 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
257}
258
259/*
260 * Devices that remain active during a system suspend are
261 * put back into 1-bit mode.
262 */
263static int sdio_disable_wide(struct mmc_card *card)
264{
265 int ret;
266 u8 ctrl;
267
268 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
269 return 0;
270
271 if (card->cccr.low_speed && !card->cccr.wide_bus)
272 return 0;
273
274 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
275 if (ret)
276 return ret;
277
278 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
279 return 0;
280
281 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
282 ctrl |= SDIO_BUS_ASYNC_INT;
283
284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
285 if (ret)
286 return ret;
287
288 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
289
290 return 0;
291}
292
293
294static int sdio_enable_4bit_bus(struct mmc_card *card)
295{
296 int err;
297
298 if (card->type == MMC_TYPE_SDIO)
299 return sdio_enable_wide(card);
300
301 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
302 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
303 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
304 if (err)
305 return err;
306 } else
307 return 0;
308
309 err = sdio_enable_wide(card);
310 if (err <= 0)
311 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
312
313 return err;
314}
315
316
317/*
318 * Test if the card supports high-speed mode and, if so, switch to it.
319 */
320static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
321{
322 int ret;
323 u8 speed;
324
325 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
326 return 0;
327
328 if (!card->cccr.high_speed)
329 return 0;
330
331 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
332 if (ret)
333 return ret;
334
335 if (enable)
336 speed |= SDIO_SPEED_EHS;
337 else
338 speed &= ~SDIO_SPEED_EHS;
339
340 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
341 if (ret)
342 return ret;
343
344 return 1;
345}
346
347/*
348 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
349 */
350static int sdio_enable_hs(struct mmc_card *card)
351{
352 int ret;
353
354 ret = mmc_sdio_switch_hs(card, true);
355 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
356 return ret;
357
358 ret = mmc_sd_switch_hs(card);
359 if (ret <= 0)
360 mmc_sdio_switch_hs(card, false);
361
362 return ret;
363}
364
365static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
366{
367 unsigned max_dtr;
368
369 if (mmc_card_highspeed(card)) {
370 /*
371 * The SDIO specification doesn't mention how
372 * the CIS transfer speed register relates to
373 * high-speed, but it seems that 50 MHz is
374 * mandatory.
375 */
376 max_dtr = 50000000;
377 } else {
378 max_dtr = card->cis.max_dtr;
379 }
380
381 if (card->type == MMC_TYPE_SD_COMBO)
382 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
383
384 return max_dtr;
385}
386
387static unsigned char host_drive_to_sdio_drive(int host_strength)
388{
389 switch (host_strength) {
390 case MMC_SET_DRIVER_TYPE_A:
391 return SDIO_DTSx_SET_TYPE_A;
392 case MMC_SET_DRIVER_TYPE_B:
393 return SDIO_DTSx_SET_TYPE_B;
394 case MMC_SET_DRIVER_TYPE_C:
395 return SDIO_DTSx_SET_TYPE_C;
396 case MMC_SET_DRIVER_TYPE_D:
397 return SDIO_DTSx_SET_TYPE_D;
398 default:
399 return SDIO_DTSx_SET_TYPE_B;
400 }
401}
402
403static void sdio_select_driver_type(struct mmc_card *card)
404{
405 int host_drv_type = SD_DRIVER_TYPE_B;
406 int card_drv_type = SD_DRIVER_TYPE_B;
407 int drive_strength;
408 unsigned char card_strength;
409 int err;
410
411 /*
412 * If the host doesn't support any of the Driver Types A,C or D,
413 * or there is no board specific handler then default Driver
414 * Type B is used.
415 */
416 if (!(card->host->caps &
417 (MMC_CAP_DRIVER_TYPE_A |
418 MMC_CAP_DRIVER_TYPE_C |
419 MMC_CAP_DRIVER_TYPE_D)))
420 return;
421
422 if (!card->host->ops->select_drive_strength)
423 return;
424
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
426 host_drv_type |= SD_DRIVER_TYPE_A;
427
428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
429 host_drv_type |= SD_DRIVER_TYPE_C;
430
431 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
432 host_drv_type |= SD_DRIVER_TYPE_D;
433
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
435 card_drv_type |= SD_DRIVER_TYPE_A;
436
437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
438 card_drv_type |= SD_DRIVER_TYPE_C;
439
440 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
441 card_drv_type |= SD_DRIVER_TYPE_D;
442
443 /*
444 * The drive strength that the hardware can support
445 * depends on the board design. Pass the appropriate
446 * information and let the hardware specific code
447 * return what is possible given the options
448 */
449 drive_strength = card->host->ops->select_drive_strength(
450 card->sw_caps.uhs_max_dtr,
451 host_drv_type, card_drv_type);
452
453 /* if error just use default for drive strength B */
454 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
455 &card_strength);
456 if (err)
457 return;
458
459 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
460 card_strength |= host_drive_to_sdio_drive(drive_strength);
461
462 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
463 card_strength, NULL);
464
465 /* if error default to drive strength B */
466 if (!err)
467 mmc_set_driver_type(card->host, drive_strength);
468}
469
470
471static int sdio_set_bus_speed_mode(struct mmc_card *card)
472{
473 unsigned int bus_speed, timing;
474 int err;
475 unsigned char speed;
476
477 /*
478 * If the host doesn't support any of the UHS-I modes, fallback on
479 * default speed.
480 */
481 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
483 return 0;
484
485 bus_speed = SDIO_SPEED_SDR12;
486 timing = MMC_TIMING_UHS_SDR12;
487 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
488 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
489 bus_speed = SDIO_SPEED_SDR104;
490 timing = MMC_TIMING_UHS_SDR104;
491 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
492 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
493 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
494 bus_speed = SDIO_SPEED_DDR50;
495 timing = MMC_TIMING_UHS_DDR50;
496 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
499 SD_MODE_UHS_SDR50)) {
500 bus_speed = SDIO_SPEED_SDR50;
501 timing = MMC_TIMING_UHS_SDR50;
502 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
503 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
504 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
505 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
506 bus_speed = SDIO_SPEED_SDR25;
507 timing = MMC_TIMING_UHS_SDR25;
508 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
509 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
510 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
511 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
512 SD_MODE_UHS_SDR12)) {
513 bus_speed = SDIO_SPEED_SDR12;
514 timing = MMC_TIMING_UHS_SDR12;
515 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516 }
517
518 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
519 if (err)
520 return err;
521
522 speed &= ~SDIO_SPEED_BSS_MASK;
523 speed |= bus_speed;
524 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
525 if (err)
526 return err;
527
528 if (bus_speed) {
529 mmc_set_timing(card->host, timing);
530 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
531 }
532
533 return 0;
534}
535
536/*
537 * UHS-I specific initialization procedure
538 */
539static int mmc_sdio_init_uhs_card(struct mmc_card *card)
540{
541 int err;
542
543 if (!card->scr.sda_spec3)
544 return 0;
545
546 /*
547 * Switch to wider bus (if supported).
548 */
549 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
550 err = sdio_enable_4bit_bus(card);
551 if (err > 0) {
552 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
553 err = 0;
554 }
555 }
556
557 /* Set the driver strength for the card */
558 sdio_select_driver_type(card);
559
560 /* Set bus speed mode of the card */
561 err = sdio_set_bus_speed_mode(card);
562 if (err)
563 goto out;
564
565 /* Initialize and start re-tuning timer */
566 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
567 err = card->host->ops->execute_tuning(card->host,
568 MMC_SEND_TUNING_BLOCK);
569
570out:
571
572 return err;
573}
574
575/*
576 * Handle the detection and initialisation of a card.
577 *
578 * In the case of a resume, "oldcard" will contain the card
579 * we're trying to reinitialise.
580 */
581static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
582 struct mmc_card *oldcard, int powered_resume)
583{
584 struct mmc_card *card;
585 int err;
586
587 BUG_ON(!host);
588 WARN_ON(!host->claimed);
589
590 /*
591 * Inform the card of the voltage
592 */
593 if (!powered_resume) {
594 /* The initialization should be done at 3.3 V I/O voltage. */
595 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
596
597 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
598 if (err)
599 goto err;
600 }
601
602 /*
603 * For SPI, enable CRC as appropriate.
604 */
605 if (mmc_host_is_spi(host)) {
606 err = mmc_spi_set_crc(host, use_spi_crc);
607 if (err)
608 goto err;
609 }
610
611 /*
612 * Allocate card structure.
613 */
614 card = mmc_alloc_card(host, NULL);
615 if (IS_ERR(card)) {
616 err = PTR_ERR(card);
617 goto err;
618 }
619
620 if ((ocr & R4_MEMORY_PRESENT) &&
621 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
622 card->type = MMC_TYPE_SD_COMBO;
623
624 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
625 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
626 mmc_remove_card(card);
627 return -ENOENT;
628 }
629 } else {
630 card->type = MMC_TYPE_SDIO;
631
632 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
633 mmc_remove_card(card);
634 return -ENOENT;
635 }
636 }
637
638 /*
639 * Call the optional HC's init_card function to handle quirks.
640 */
641 if (host->ops->init_card)
642 host->ops->init_card(host, card);
643
644 /*
645 * If the host and card support UHS-I mode request the card
646 * to switch to 1.8V signaling level. No 1.8v signalling if
647 * UHS mode is not enabled to maintain compatibilty and some
648 * systems that claim 1.8v signalling in fact do not support
649 * it.
650 */
651 if ((ocr & R4_18V_PRESENT) &&
652 (host->caps &
653 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
654 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
655 MMC_CAP_UHS_DDR50))) {
656 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
657 true);
658 if (err) {
659 ocr &= ~R4_18V_PRESENT;
660 host->ocr &= ~R4_18V_PRESENT;
661 }
662 err = 0;
663 } else {
664 ocr &= ~R4_18V_PRESENT;
665 host->ocr &= ~R4_18V_PRESENT;
666 }
667
668 /*
669 * For native busses: set card RCA and quit open drain mode.
670 */
671 if (!powered_resume && !mmc_host_is_spi(host)) {
672 err = mmc_send_relative_addr(host, &card->rca);
673 if (err)
674 goto remove;
675
676 /*
677 * Update oldcard with the new RCA received from the SDIO
678 * device -- we're doing this so that it's updated in the
679 * "card" struct when oldcard overwrites that later.
680 */
681 if (oldcard)
682 oldcard->rca = card->rca;
683 }
684
685 /*
686 * Read CSD, before selecting the card
687 */
688 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
689 err = mmc_sd_get_csd(host, card);
690 if (err)
691 return err;
692
693 mmc_decode_cid(card);
694 }
695
696 /*
697 * Select card, as all following commands rely on that.
698 */
699 if (!powered_resume && !mmc_host_is_spi(host)) {
700 err = mmc_select_card(card);
701 if (err)
702 goto remove;
703 }
704
705 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
706 /*
707 * This is non-standard SDIO device, meaning it doesn't
708 * have any CIA (Common I/O area) registers present.
709 * It's host's responsibility to fill cccr and cis
710 * structures in init_card().
711 */
712 mmc_set_clock(host, card->cis.max_dtr);
713
714 if (card->cccr.high_speed) {
715 mmc_card_set_highspeed(card);
716 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
717 }
718
719 goto finish;
720 }
721
722 /*
723 * Read the common registers.
724 */
725 err = sdio_read_cccr(card, ocr);
726 if (err)
727 goto remove;
728
729 /*
730 * Read the common CIS tuples.
731 */
732 err = sdio_read_common_cis(card);
733 if (err)
734 goto remove;
735
736 if (oldcard) {
737 int same = (card->cis.vendor == oldcard->cis.vendor &&
738 card->cis.device == oldcard->cis.device);
739 mmc_remove_card(card);
740 if (!same)
741 return -ENOENT;
742
743 card = oldcard;
744 }
745 mmc_fixup_device(card, NULL);
746
747 if (card->type == MMC_TYPE_SD_COMBO) {
748 err = mmc_sd_setup_card(host, card, oldcard != NULL);
749 /* handle as SDIO-only card if memory init failed */
750 if (err) {
751 mmc_go_idle(host);
752 if (mmc_host_is_spi(host))
753 /* should not fail, as it worked previously */
754 mmc_spi_set_crc(host, use_spi_crc);
755 card->type = MMC_TYPE_SDIO;
756 } else
757 card->dev.type = &sd_type;
758 }
759
760 /*
761 * If needed, disconnect card detection pull-up resistor.
762 */
763 err = sdio_disable_cd(card);
764 if (err)
765 goto remove;
766
767 /* Initialization sequence for UHS-I cards */
768 /* Only if card supports 1.8v and UHS signaling */
769 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
770 err = mmc_sdio_init_uhs_card(card);
771 if (err)
772 goto remove;
773
774 /* Card is an ultra-high-speed card */
775 mmc_card_set_uhs(card);
776 } else {
777 /*
778 * Switch to high-speed (if supported).
779 */
780 err = sdio_enable_hs(card);
781 if (err > 0)
782 mmc_sd_go_highspeed(card);
783 else if (err)
784 goto remove;
785
786 /*
787 * Change to the card's maximum speed.
788 */
789 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
790
791 /*
792 * Switch to wider bus (if supported).
793 */
794 err = sdio_enable_4bit_bus(card);
795 if (err > 0)
796 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
797 else if (err)
798 goto remove;
799 }
800finish:
801 if (!oldcard)
802 host->card = card;
803 return 0;
804
805remove:
806 if (!oldcard)
807 mmc_remove_card(card);
808
809err:
810 return err;
811}
812
813/*
814 * Host is being removed. Free up the current card.
815 */
816static void mmc_sdio_remove(struct mmc_host *host)
817{
818 int i;
819
820 BUG_ON(!host);
821 BUG_ON(!host->card);
822
823 for (i = 0;i < host->card->sdio_funcs;i++) {
824 if (host->card->sdio_func[i]) {
825 sdio_remove_func(host->card->sdio_func[i]);
826 host->card->sdio_func[i] = NULL;
827 }
828 }
829
830 mmc_remove_card(host->card);
831 host->card = NULL;
832}
833
834/*
835 * Card detection - card is alive.
836 */
837static int mmc_sdio_alive(struct mmc_host *host)
838{
839 return mmc_select_card(host->card);
840}
841
842/*
843 * Card detection callback from host.
844 */
845static void mmc_sdio_detect(struct mmc_host *host)
846{
847 int err;
848
849 BUG_ON(!host);
850 BUG_ON(!host->card);
851
852 /* Make sure card is powered before detecting it */
853 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
854 err = pm_runtime_get_sync(&host->card->dev);
855 if (err < 0)
856 goto out;
857 }
858
859 mmc_claim_host(host);
860
861 /*
862 * Just check if our card has been removed.
863 */
864 err = _mmc_detect_card_removed(host);
865
866 mmc_release_host(host);
867
868 /*
869 * Tell PM core it's OK to power off the card now.
870 *
871 * The _sync variant is used in order to ensure that the card
872 * is left powered off in case an error occurred, and the card
873 * is going to be removed.
874 *
875 * Since there is no specific reason to believe a new user
876 * is about to show up at this point, the _sync variant is
877 * desirable anyway.
878 */
879 if (host->caps & MMC_CAP_POWER_OFF_CARD)
880 pm_runtime_put_sync(&host->card->dev);
881
882out:
883 if (err) {
884 mmc_sdio_remove(host);
885
886 mmc_claim_host(host);
887 mmc_detach_bus(host);
888 mmc_power_off(host);
889 mmc_release_host(host);
890 }
891}
892
893/*
894 * SDIO suspend. We need to suspend all functions separately.
895 * Therefore all registered functions must have drivers with suspend
896 * and resume methods. Failing that we simply remove the whole card.
897 */
898static int mmc_sdio_suspend(struct mmc_host *host)
899{
900 int i, err = 0;
901
902 for (i = 0; i < host->card->sdio_funcs; i++) {
903 struct sdio_func *func = host->card->sdio_func[i];
904 if (func && sdio_func_present(func) && func->dev.driver) {
905 const struct dev_pm_ops *pmops = func->dev.driver->pm;
906 if (!pmops || !pmops->suspend || !pmops->resume) {
907 /* force removal of entire card in that case */
908 err = -ENOSYS;
909 } else
910 err = pmops->suspend(&func->dev);
911 if (err)
912 break;
913 }
914 }
915 while (err && --i >= 0) {
916 struct sdio_func *func = host->card->sdio_func[i];
917 if (func && sdio_func_present(func) && func->dev.driver) {
918 const struct dev_pm_ops *pmops = func->dev.driver->pm;
919 pmops->resume(&func->dev);
920 }
921 }
922
923 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
924 mmc_claim_host(host);
925 sdio_disable_wide(host->card);
926 mmc_release_host(host);
927 }
928
929 return err;
930}
931
932static int mmc_sdio_resume(struct mmc_host *host)
933{
934 int i, err = 0;
935
936 BUG_ON(!host);
937 BUG_ON(!host->card);
938
939 /* Basic card reinitialization. */
940 mmc_claim_host(host);
941
942 /* No need to reinitialize powered-resumed nonremovable cards */
943 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
944 err = mmc_sdio_init_card(host, host->ocr, host->card,
945 mmc_card_keep_power(host));
946 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
947 /* We may have switched to 1-bit mode during suspend */
948 err = sdio_enable_4bit_bus(host->card);
949 if (err > 0) {
950 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
951 err = 0;
952 }
953 }
954
955 if (!err && host->sdio_irqs)
956 wake_up_process(host->sdio_irq_thread);
957 mmc_release_host(host);
958
959 /*
960 * If the card looked to be the same as before suspending, then
961 * we proceed to resume all card functions. If one of them returns
962 * an error then we simply return that error to the core and the
963 * card will be redetected as new. It is the responsibility of
964 * the function driver to perform further tests with the extra
965 * knowledge it has of the card to confirm the card is indeed the
966 * same as before suspending (same MAC address for network cards,
967 * etc.) and return an error otherwise.
968 */
969 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
970 struct sdio_func *func = host->card->sdio_func[i];
971 if (func && sdio_func_present(func) && func->dev.driver) {
972 const struct dev_pm_ops *pmops = func->dev.driver->pm;
973 err = pmops->resume(&func->dev);
974 }
975 }
976
977 return err;
978}
979
980static int mmc_sdio_power_restore(struct mmc_host *host)
981{
982 int ret;
983 u32 ocr;
984
985 BUG_ON(!host);
986 BUG_ON(!host->card);
987
988 mmc_claim_host(host);
989
990 /*
991 * Reset the card by performing the same steps that are taken by
992 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
993 *
994 * sdio_reset() is technically not needed. Having just powered up the
995 * hardware, it should already be in reset state. However, some
996 * platforms (such as SD8686 on OLPC) do not instantly cut power,
997 * meaning that a reset is required when restoring power soon after
998 * powering off. It is harmless in other cases.
999 *
1000 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1001 * is not necessary for non-removable cards. However, it is required
1002 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1003 * harmless in other situations.
1004 *
1005 * With these steps taken, mmc_select_voltage() is also required to
1006 * restore the correct voltage setting of the card.
1007 */
1008
1009 /* The initialization should be done at 3.3 V I/O voltage. */
1010 if (!mmc_card_keep_power(host))
1011 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1012
1013 sdio_reset(host);
1014 mmc_go_idle(host);
1015 mmc_send_if_cond(host, host->ocr_avail);
1016
1017 ret = mmc_send_io_op_cond(host, 0, &ocr);
1018 if (ret)
1019 goto out;
1020
1021 if (host->ocr_avail_sdio)
1022 host->ocr_avail = host->ocr_avail_sdio;
1023
1024 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1025 if (!host->ocr) {
1026 ret = -EINVAL;
1027 goto out;
1028 }
1029
1030 ret = mmc_sdio_init_card(host, host->ocr, host->card,
1031 mmc_card_keep_power(host));
1032 if (!ret && host->sdio_irqs)
1033 mmc_signal_sdio_irq(host);
1034
1035out:
1036 mmc_release_host(host);
1037
1038 return ret;
1039}
1040
1041static const struct mmc_bus_ops mmc_sdio_ops = {
1042 .remove = mmc_sdio_remove,
1043 .detect = mmc_sdio_detect,
1044 .suspend = mmc_sdio_suspend,
1045 .resume = mmc_sdio_resume,
1046 .power_restore = mmc_sdio_power_restore,
1047 .alive = mmc_sdio_alive,
1048};
1049
1050
1051/*
1052 * Starting point for SDIO card init.
1053 */
1054int mmc_attach_sdio(struct mmc_host *host)
1055{
1056 int err, i, funcs;
1057 u32 ocr;
1058 struct mmc_card *card;
1059
1060 BUG_ON(!host);
1061 WARN_ON(!host->claimed);
1062
1063 err = mmc_send_io_op_cond(host, 0, &ocr);
1064 if (err)
1065 return err;
1066
1067 mmc_attach_bus(host, &mmc_sdio_ops);
1068 if (host->ocr_avail_sdio)
1069 host->ocr_avail = host->ocr_avail_sdio;
1070
1071 /*
1072 * Sanity check the voltages that the card claims to
1073 * support.
1074 */
1075 if (ocr & 0x7F) {
1076 pr_warning("%s: card claims to support voltages "
1077 "below the defined range. These will be ignored.\n",
1078 mmc_hostname(host));
1079 ocr &= ~0x7F;
1080 }
1081
1082 host->ocr = mmc_select_voltage(host, ocr);
1083
1084 /*
1085 * Can we support the voltage(s) of the card(s)?
1086 */
1087 if (!host->ocr) {
1088 err = -EINVAL;
1089 goto err;
1090 }
1091
1092 /*
1093 * Detect and init the card.
1094 */
1095 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1096 if (err) {
1097 if (err == -EAGAIN) {
1098 /*
1099 * Retry initialization with S18R set to 0.
1100 */
1101 host->ocr &= ~R4_18V_PRESENT;
1102 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1103 }
1104 if (err)
1105 goto err;
1106 }
1107 card = host->card;
1108
1109 /*
1110 * Enable runtime PM only if supported by host+card+board
1111 */
1112 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1113 /*
1114 * Let runtime PM core know our card is active
1115 */
1116 err = pm_runtime_set_active(&card->dev);
1117 if (err)
1118 goto remove;
1119
1120 /*
1121 * Enable runtime PM for this card
1122 */
1123 pm_runtime_enable(&card->dev);
1124 }
1125
1126 /*
1127 * The number of functions on the card is encoded inside
1128 * the ocr.
1129 */
1130 funcs = (ocr & 0x70000000) >> 28;
1131 card->sdio_funcs = 0;
1132
1133 /*
1134 * Initialize (but don't add) all present functions.
1135 */
1136 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1137 err = sdio_init_func(host->card, i + 1);
1138 if (err)
1139 goto remove;
1140
1141 /*
1142 * Enable Runtime PM for this func (if supported)
1143 */
1144 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1145 pm_runtime_enable(&card->sdio_func[i]->dev);
1146 }
1147
1148 /*
1149 * First add the card to the driver model...
1150 */
1151 mmc_release_host(host);
1152 err = mmc_add_card(host->card);
1153 if (err)
1154 goto remove_added;
1155
1156 /*
1157 * ...then the SDIO functions.
1158 */
1159 for (i = 0;i < funcs;i++) {
1160 err = sdio_add_func(host->card->sdio_func[i]);
1161 if (err)
1162 goto remove_added;
1163 }
1164
1165 mmc_claim_host(host);
1166 return 0;
1167
1168
1169remove_added:
1170 /* Remove without lock if the device has been added. */
1171 mmc_sdio_remove(host);
1172 mmc_claim_host(host);
1173remove:
1174 /* And with lock if it hasn't been added. */
1175 mmc_release_host(host);
1176 if (host->card)
1177 mmc_sdio_remove(host);
1178 mmc_claim_host(host);
1179err:
1180 mmc_detach_bus(host);
1181
1182 pr_err("%s: error %d whilst initialising SDIO card\n",
1183 mmc_hostname(host), err);
1184
1185 return err;
1186}
1187
1/*
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 if (WARN_ON(fn > SDIO_MAX_FUNCS))
67 return -EINVAL;
68
69 func = sdio_alloc_func(card);
70 if (IS_ERR(func))
71 return PTR_ERR(func);
72
73 func->num = fn;
74
75 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
76 ret = sdio_read_fbr(func);
77 if (ret)
78 goto fail;
79
80 ret = sdio_read_func_cis(func);
81 if (ret)
82 goto fail;
83 } else {
84 func->vendor = func->card->cis.vendor;
85 func->device = func->card->cis.device;
86 func->max_blksize = func->card->cis.blksize;
87 }
88
89 card->sdio_func[fn - 1] = func;
90
91 return 0;
92
93fail:
94 /*
95 * It is okay to remove the function here even though we hold
96 * the host lock as we haven't registered the device yet.
97 */
98 sdio_remove_func(func);
99 return ret;
100}
101
102static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
103{
104 int ret;
105 int cccr_vsn;
106 int uhs = ocr & R4_18V_PRESENT;
107 unsigned char data;
108 unsigned char speed;
109
110 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
111 if (ret)
112 goto out;
113
114 cccr_vsn = data & 0x0f;
115
116 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
117 pr_err("%s: unrecognised CCCR structure version %d\n",
118 mmc_hostname(card->host), cccr_vsn);
119 return -EINVAL;
120 }
121
122 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
123
124 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
125 if (ret)
126 goto out;
127
128 if (data & SDIO_CCCR_CAP_SMB)
129 card->cccr.multi_block = 1;
130 if (data & SDIO_CCCR_CAP_LSC)
131 card->cccr.low_speed = 1;
132 if (data & SDIO_CCCR_CAP_4BLS)
133 card->cccr.wide_bus = 1;
134
135 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
136 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
137 if (ret)
138 goto out;
139
140 if (data & SDIO_POWER_SMPC)
141 card->cccr.high_power = 1;
142 }
143
144 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
145 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
146 if (ret)
147 goto out;
148
149 card->scr.sda_spec3 = 0;
150 card->sw_caps.sd3_bus_mode = 0;
151 card->sw_caps.sd3_drv_type = 0;
152 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
153 card->scr.sda_spec3 = 1;
154 ret = mmc_io_rw_direct(card, 0, 0,
155 SDIO_CCCR_UHS, 0, &data);
156 if (ret)
157 goto out;
158
159 if (mmc_host_uhs(card->host)) {
160 if (data & SDIO_UHS_DDR50)
161 card->sw_caps.sd3_bus_mode
162 |= SD_MODE_UHS_DDR50;
163
164 if (data & SDIO_UHS_SDR50)
165 card->sw_caps.sd3_bus_mode
166 |= SD_MODE_UHS_SDR50;
167
168 if (data & SDIO_UHS_SDR104)
169 card->sw_caps.sd3_bus_mode
170 |= SD_MODE_UHS_SDR104;
171 }
172
173 ret = mmc_io_rw_direct(card, 0, 0,
174 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
175 if (ret)
176 goto out;
177
178 if (data & SDIO_DRIVE_SDTA)
179 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
180 if (data & SDIO_DRIVE_SDTC)
181 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
182 if (data & SDIO_DRIVE_SDTD)
183 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
184 }
185
186 /* if no uhs mode ensure we check for high speed */
187 if (!card->sw_caps.sd3_bus_mode) {
188 if (speed & SDIO_SPEED_SHS) {
189 card->cccr.high_speed = 1;
190 card->sw_caps.hs_max_dtr = 50000000;
191 } else {
192 card->cccr.high_speed = 0;
193 card->sw_caps.hs_max_dtr = 25000000;
194 }
195 }
196 }
197
198out:
199 return ret;
200}
201
202static int sdio_enable_wide(struct mmc_card *card)
203{
204 int ret;
205 u8 ctrl;
206
207 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
208 return 0;
209
210 if (card->cccr.low_speed && !card->cccr.wide_bus)
211 return 0;
212
213 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
214 if (ret)
215 return ret;
216
217 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
218 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
219 mmc_hostname(card->host), ctrl);
220
221 /* set as 4-bit bus width */
222 ctrl &= ~SDIO_BUS_WIDTH_MASK;
223 ctrl |= SDIO_BUS_WIDTH_4BIT;
224
225 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
226 if (ret)
227 return ret;
228
229 return 1;
230}
231
232/*
233 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
234 * of the card. This may be required on certain setups of boards,
235 * controllers and embedded sdio device which do not need the card's
236 * pull-up. As a result, card detection is disabled and power is saved.
237 */
238static int sdio_disable_cd(struct mmc_card *card)
239{
240 int ret;
241 u8 ctrl;
242
243 if (!mmc_card_disable_cd(card))
244 return 0;
245
246 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
247 if (ret)
248 return ret;
249
250 ctrl |= SDIO_BUS_CD_DISABLE;
251
252 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
253}
254
255/*
256 * Devices that remain active during a system suspend are
257 * put back into 1-bit mode.
258 */
259static int sdio_disable_wide(struct mmc_card *card)
260{
261 int ret;
262 u8 ctrl;
263
264 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
265 return 0;
266
267 if (card->cccr.low_speed && !card->cccr.wide_bus)
268 return 0;
269
270 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
271 if (ret)
272 return ret;
273
274 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
275 return 0;
276
277 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
278 ctrl |= SDIO_BUS_ASYNC_INT;
279
280 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
281 if (ret)
282 return ret;
283
284 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
285
286 return 0;
287}
288
289
290static int sdio_enable_4bit_bus(struct mmc_card *card)
291{
292 int err;
293
294 if (card->type == MMC_TYPE_SDIO)
295 err = sdio_enable_wide(card);
296 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
297 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
298 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
299 if (err)
300 return err;
301 err = sdio_enable_wide(card);
302 if (err <= 0)
303 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
304 } else
305 return 0;
306
307 if (err > 0) {
308 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
309 err = 0;
310 }
311
312 return err;
313}
314
315
316/*
317 * Test if the card supports high-speed mode and, if so, switch to it.
318 */
319static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
320{
321 int ret;
322 u8 speed;
323
324 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
325 return 0;
326
327 if (!card->cccr.high_speed)
328 return 0;
329
330 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
331 if (ret)
332 return ret;
333
334 if (enable)
335 speed |= SDIO_SPEED_EHS;
336 else
337 speed &= ~SDIO_SPEED_EHS;
338
339 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
340 if (ret)
341 return ret;
342
343 return 1;
344}
345
346/*
347 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
348 */
349static int sdio_enable_hs(struct mmc_card *card)
350{
351 int ret;
352
353 ret = mmc_sdio_switch_hs(card, true);
354 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
355 return ret;
356
357 ret = mmc_sd_switch_hs(card);
358 if (ret <= 0)
359 mmc_sdio_switch_hs(card, false);
360
361 return ret;
362}
363
364static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
365{
366 unsigned max_dtr;
367
368 if (mmc_card_hs(card)) {
369 /*
370 * The SDIO specification doesn't mention how
371 * the CIS transfer speed register relates to
372 * high-speed, but it seems that 50 MHz is
373 * mandatory.
374 */
375 max_dtr = 50000000;
376 } else {
377 max_dtr = card->cis.max_dtr;
378 }
379
380 if (card->type == MMC_TYPE_SD_COMBO)
381 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
382
383 return max_dtr;
384}
385
386static unsigned char host_drive_to_sdio_drive(int host_strength)
387{
388 switch (host_strength) {
389 case MMC_SET_DRIVER_TYPE_A:
390 return SDIO_DTSx_SET_TYPE_A;
391 case MMC_SET_DRIVER_TYPE_B:
392 return SDIO_DTSx_SET_TYPE_B;
393 case MMC_SET_DRIVER_TYPE_C:
394 return SDIO_DTSx_SET_TYPE_C;
395 case MMC_SET_DRIVER_TYPE_D:
396 return SDIO_DTSx_SET_TYPE_D;
397 default:
398 return SDIO_DTSx_SET_TYPE_B;
399 }
400}
401
402static void sdio_select_driver_type(struct mmc_card *card)
403{
404 int card_drv_type, drive_strength, drv_type;
405 unsigned char card_strength;
406 int err;
407
408 card->drive_strength = 0;
409
410 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
411
412 drive_strength = mmc_select_drive_strength(card,
413 card->sw_caps.uhs_max_dtr,
414 card_drv_type, &drv_type);
415
416 if (drive_strength) {
417 /* if error just use default for drive strength B */
418 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
419 &card_strength);
420 if (err)
421 return;
422
423 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
424 card_strength |= host_drive_to_sdio_drive(drive_strength);
425
426 /* if error default to drive strength B */
427 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
428 card_strength, NULL);
429 if (err)
430 return;
431 card->drive_strength = drive_strength;
432 }
433
434 if (drv_type)
435 mmc_set_driver_type(card->host, drv_type);
436}
437
438
439static int sdio_set_bus_speed_mode(struct mmc_card *card)
440{
441 unsigned int bus_speed, timing;
442 int err;
443 unsigned char speed;
444
445 /*
446 * If the host doesn't support any of the UHS-I modes, fallback on
447 * default speed.
448 */
449 if (!mmc_host_uhs(card->host))
450 return 0;
451
452 bus_speed = SDIO_SPEED_SDR12;
453 timing = MMC_TIMING_UHS_SDR12;
454 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
455 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
456 bus_speed = SDIO_SPEED_SDR104;
457 timing = MMC_TIMING_UHS_SDR104;
458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
459 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
460 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
461 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
462 bus_speed = SDIO_SPEED_DDR50;
463 timing = MMC_TIMING_UHS_DDR50;
464 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
465 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
467 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
468 SD_MODE_UHS_SDR50)) {
469 bus_speed = SDIO_SPEED_SDR50;
470 timing = MMC_TIMING_UHS_SDR50;
471 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
476 bus_speed = SDIO_SPEED_SDR25;
477 timing = MMC_TIMING_UHS_SDR25;
478 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
479 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
480 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
481 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
483 SD_MODE_UHS_SDR12)) {
484 bus_speed = SDIO_SPEED_SDR12;
485 timing = MMC_TIMING_UHS_SDR12;
486 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
487 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
488 }
489
490 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
491 if (err)
492 return err;
493
494 speed &= ~SDIO_SPEED_BSS_MASK;
495 speed |= bus_speed;
496 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
497 if (err)
498 return err;
499
500 if (bus_speed) {
501 mmc_set_timing(card->host, timing);
502 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
503 }
504
505 return 0;
506}
507
508/*
509 * UHS-I specific initialization procedure
510 */
511static int mmc_sdio_init_uhs_card(struct mmc_card *card)
512{
513 int err;
514
515 if (!card->scr.sda_spec3)
516 return 0;
517
518 /*
519 * Switch to wider bus (if supported).
520 */
521 if (card->host->caps & MMC_CAP_4_BIT_DATA)
522 err = sdio_enable_4bit_bus(card);
523
524 /* Set the driver strength for the card */
525 sdio_select_driver_type(card);
526
527 /* Set bus speed mode of the card */
528 err = sdio_set_bus_speed_mode(card);
529 if (err)
530 goto out;
531
532 /*
533 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
534 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
535 */
536 if (!mmc_host_is_spi(card->host) &&
537 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
538 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
539 err = mmc_execute_tuning(card);
540out:
541 return err;
542}
543
544/*
545 * Handle the detection and initialisation of a card.
546 *
547 * In the case of a resume, "oldcard" will contain the card
548 * we're trying to reinitialise.
549 */
550static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
551 struct mmc_card *oldcard, int powered_resume)
552{
553 struct mmc_card *card;
554 int err;
555 int retries = 10;
556 u32 rocr = 0;
557 u32 ocr_card = ocr;
558
559 WARN_ON(!host->claimed);
560
561 /* to query card if 1.8V signalling is supported */
562 if (mmc_host_uhs(host))
563 ocr |= R4_18V_PRESENT;
564
565try_again:
566 if (!retries) {
567 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
568 ocr &= ~R4_18V_PRESENT;
569 }
570
571 /*
572 * Inform the card of the voltage
573 */
574 if (!powered_resume) {
575 err = mmc_send_io_op_cond(host, ocr, &rocr);
576 if (err)
577 goto err;
578 }
579
580 /*
581 * For SPI, enable CRC as appropriate.
582 */
583 if (mmc_host_is_spi(host)) {
584 err = mmc_spi_set_crc(host, use_spi_crc);
585 if (err)
586 goto err;
587 }
588
589 /*
590 * Allocate card structure.
591 */
592 card = mmc_alloc_card(host, NULL);
593 if (IS_ERR(card)) {
594 err = PTR_ERR(card);
595 goto err;
596 }
597
598 if ((rocr & R4_MEMORY_PRESENT) &&
599 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
600 card->type = MMC_TYPE_SD_COMBO;
601
602 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
603 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
604 mmc_remove_card(card);
605 return -ENOENT;
606 }
607 } else {
608 card->type = MMC_TYPE_SDIO;
609
610 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
611 mmc_remove_card(card);
612 return -ENOENT;
613 }
614 }
615
616 /*
617 * Call the optional HC's init_card function to handle quirks.
618 */
619 if (host->ops->init_card)
620 host->ops->init_card(host, card);
621
622 /*
623 * If the host and card support UHS-I mode request the card
624 * to switch to 1.8V signaling level. No 1.8v signalling if
625 * UHS mode is not enabled to maintain compatibility and some
626 * systems that claim 1.8v signalling in fact do not support
627 * it.
628 */
629 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
630 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
631 ocr_card);
632 if (err == -EAGAIN) {
633 sdio_reset(host);
634 mmc_go_idle(host);
635 mmc_send_if_cond(host, host->ocr_avail);
636 mmc_remove_card(card);
637 retries--;
638 goto try_again;
639 } else if (err) {
640 ocr &= ~R4_18V_PRESENT;
641 }
642 err = 0;
643 } else {
644 ocr &= ~R4_18V_PRESENT;
645 }
646
647 /*
648 * For native busses: set card RCA and quit open drain mode.
649 */
650 if (!powered_resume && !mmc_host_is_spi(host)) {
651 err = mmc_send_relative_addr(host, &card->rca);
652 if (err)
653 goto remove;
654
655 /*
656 * Update oldcard with the new RCA received from the SDIO
657 * device -- we're doing this so that it's updated in the
658 * "card" struct when oldcard overwrites that later.
659 */
660 if (oldcard)
661 oldcard->rca = card->rca;
662 }
663
664 /*
665 * Read CSD, before selecting the card
666 */
667 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
668 err = mmc_sd_get_csd(host, card);
669 if (err)
670 return err;
671
672 mmc_decode_cid(card);
673 }
674
675 /*
676 * Select card, as all following commands rely on that.
677 */
678 if (!powered_resume && !mmc_host_is_spi(host)) {
679 err = mmc_select_card(card);
680 if (err)
681 goto remove;
682 }
683
684 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
685 /*
686 * This is non-standard SDIO device, meaning it doesn't
687 * have any CIA (Common I/O area) registers present.
688 * It's host's responsibility to fill cccr and cis
689 * structures in init_card().
690 */
691 mmc_set_clock(host, card->cis.max_dtr);
692
693 if (card->cccr.high_speed) {
694 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
695 }
696
697 goto finish;
698 }
699
700 /*
701 * Read the common registers.
702 */
703 err = sdio_read_cccr(card, ocr);
704 if (err)
705 goto remove;
706
707 /*
708 * Read the common CIS tuples.
709 */
710 err = sdio_read_common_cis(card);
711 if (err)
712 goto remove;
713
714 if (oldcard) {
715 int same = (card->cis.vendor == oldcard->cis.vendor &&
716 card->cis.device == oldcard->cis.device);
717 mmc_remove_card(card);
718 if (!same)
719 return -ENOENT;
720
721 card = oldcard;
722 }
723 card->ocr = ocr_card;
724 mmc_fixup_device(card, NULL);
725
726 if (card->type == MMC_TYPE_SD_COMBO) {
727 err = mmc_sd_setup_card(host, card, oldcard != NULL);
728 /* handle as SDIO-only card if memory init failed */
729 if (err) {
730 mmc_go_idle(host);
731 if (mmc_host_is_spi(host))
732 /* should not fail, as it worked previously */
733 mmc_spi_set_crc(host, use_spi_crc);
734 card->type = MMC_TYPE_SDIO;
735 } else
736 card->dev.type = &sd_type;
737 }
738
739 /*
740 * If needed, disconnect card detection pull-up resistor.
741 */
742 err = sdio_disable_cd(card);
743 if (err)
744 goto remove;
745
746 /* Initialization sequence for UHS-I cards */
747 /* Only if card supports 1.8v and UHS signaling */
748 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
749 err = mmc_sdio_init_uhs_card(card);
750 if (err)
751 goto remove;
752 } else {
753 /*
754 * Switch to high-speed (if supported).
755 */
756 err = sdio_enable_hs(card);
757 if (err > 0)
758 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
759 else if (err)
760 goto remove;
761
762 /*
763 * Change to the card's maximum speed.
764 */
765 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
766
767 /*
768 * Switch to wider bus (if supported).
769 */
770 err = sdio_enable_4bit_bus(card);
771 if (err)
772 goto remove;
773 }
774finish:
775 if (!oldcard)
776 host->card = card;
777 return 0;
778
779remove:
780 if (!oldcard)
781 mmc_remove_card(card);
782
783err:
784 return err;
785}
786
787/*
788 * Host is being removed. Free up the current card.
789 */
790static void mmc_sdio_remove(struct mmc_host *host)
791{
792 int i;
793
794 for (i = 0;i < host->card->sdio_funcs;i++) {
795 if (host->card->sdio_func[i]) {
796 sdio_remove_func(host->card->sdio_func[i]);
797 host->card->sdio_func[i] = NULL;
798 }
799 }
800
801 mmc_remove_card(host->card);
802 host->card = NULL;
803}
804
805/*
806 * Card detection - card is alive.
807 */
808static int mmc_sdio_alive(struct mmc_host *host)
809{
810 return mmc_select_card(host->card);
811}
812
813/*
814 * Card detection callback from host.
815 */
816static void mmc_sdio_detect(struct mmc_host *host)
817{
818 int err;
819
820 /* Make sure card is powered before detecting it */
821 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
822 err = pm_runtime_get_sync(&host->card->dev);
823 if (err < 0) {
824 pm_runtime_put_noidle(&host->card->dev);
825 goto out;
826 }
827 }
828
829 mmc_claim_host(host);
830
831 /*
832 * Just check if our card has been removed.
833 */
834 err = _mmc_detect_card_removed(host);
835
836 mmc_release_host(host);
837
838 /*
839 * Tell PM core it's OK to power off the card now.
840 *
841 * The _sync variant is used in order to ensure that the card
842 * is left powered off in case an error occurred, and the card
843 * is going to be removed.
844 *
845 * Since there is no specific reason to believe a new user
846 * is about to show up at this point, the _sync variant is
847 * desirable anyway.
848 */
849 if (host->caps & MMC_CAP_POWER_OFF_CARD)
850 pm_runtime_put_sync(&host->card->dev);
851
852out:
853 if (err) {
854 mmc_sdio_remove(host);
855
856 mmc_claim_host(host);
857 mmc_detach_bus(host);
858 mmc_power_off(host);
859 mmc_release_host(host);
860 }
861}
862
863/*
864 * SDIO pre_suspend. We need to suspend all functions separately.
865 * Therefore all registered functions must have drivers with suspend
866 * and resume methods. Failing that we simply remove the whole card.
867 */
868static int mmc_sdio_pre_suspend(struct mmc_host *host)
869{
870 int i, err = 0;
871
872 for (i = 0; i < host->card->sdio_funcs; i++) {
873 struct sdio_func *func = host->card->sdio_func[i];
874 if (func && sdio_func_present(func) && func->dev.driver) {
875 const struct dev_pm_ops *pmops = func->dev.driver->pm;
876 if (!pmops || !pmops->suspend || !pmops->resume) {
877 /* force removal of entire card in that case */
878 err = -ENOSYS;
879 break;
880 }
881 }
882 }
883
884 return err;
885}
886
887/*
888 * SDIO suspend. Suspend all functions separately.
889 */
890static int mmc_sdio_suspend(struct mmc_host *host)
891{
892 mmc_claim_host(host);
893
894 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
895 sdio_disable_wide(host->card);
896
897 if (!mmc_card_keep_power(host)) {
898 mmc_power_off(host);
899 } else if (host->retune_period) {
900 mmc_retune_timer_stop(host);
901 mmc_retune_needed(host);
902 }
903
904 mmc_release_host(host);
905
906 return 0;
907}
908
909static int mmc_sdio_resume(struct mmc_host *host)
910{
911 int err = 0;
912
913 /* Basic card reinitialization. */
914 mmc_claim_host(host);
915
916 /* Restore power if needed */
917 if (!mmc_card_keep_power(host)) {
918 mmc_power_up(host, host->card->ocr);
919 /*
920 * Tell runtime PM core we just powered up the card,
921 * since it still believes the card is powered off.
922 * Note that currently runtime PM is only enabled
923 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
924 */
925 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
926 pm_runtime_disable(&host->card->dev);
927 pm_runtime_set_active(&host->card->dev);
928 pm_runtime_enable(&host->card->dev);
929 }
930 }
931
932 /* No need to reinitialize powered-resumed nonremovable cards */
933 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
934 sdio_reset(host);
935 mmc_go_idle(host);
936 mmc_send_if_cond(host, host->card->ocr);
937 err = mmc_send_io_op_cond(host, 0, NULL);
938 if (!err)
939 err = mmc_sdio_init_card(host, host->card->ocr,
940 host->card,
941 mmc_card_keep_power(host));
942 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
943 /* We may have switched to 1-bit mode during suspend */
944 err = sdio_enable_4bit_bus(host->card);
945 }
946
947 if (!err && host->sdio_irqs) {
948 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
949 wake_up_process(host->sdio_irq_thread);
950 else if (host->caps & MMC_CAP_SDIO_IRQ)
951 host->ops->enable_sdio_irq(host, 1);
952 }
953
954 mmc_release_host(host);
955
956 host->pm_flags &= ~MMC_PM_KEEP_POWER;
957 return err;
958}
959
960static int mmc_sdio_power_restore(struct mmc_host *host)
961{
962 int ret;
963
964 mmc_claim_host(host);
965
966 /*
967 * Reset the card by performing the same steps that are taken by
968 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
969 *
970 * sdio_reset() is technically not needed. Having just powered up the
971 * hardware, it should already be in reset state. However, some
972 * platforms (such as SD8686 on OLPC) do not instantly cut power,
973 * meaning that a reset is required when restoring power soon after
974 * powering off. It is harmless in other cases.
975 *
976 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
977 * is not necessary for non-removable cards. However, it is required
978 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
979 * harmless in other situations.
980 *
981 */
982
983 sdio_reset(host);
984 mmc_go_idle(host);
985 mmc_send_if_cond(host, host->card->ocr);
986
987 ret = mmc_send_io_op_cond(host, 0, NULL);
988 if (ret)
989 goto out;
990
991 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
992 mmc_card_keep_power(host));
993 if (!ret && host->sdio_irqs)
994 mmc_signal_sdio_irq(host);
995
996out:
997 mmc_release_host(host);
998
999 return ret;
1000}
1001
1002static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1003{
1004 /* No references to the card, cut the power to it. */
1005 mmc_claim_host(host);
1006 mmc_power_off(host);
1007 mmc_release_host(host);
1008
1009 return 0;
1010}
1011
1012static int mmc_sdio_runtime_resume(struct mmc_host *host)
1013{
1014 int ret;
1015
1016 /* Restore power and re-initialize. */
1017 mmc_claim_host(host);
1018 mmc_power_up(host, host->card->ocr);
1019 ret = mmc_sdio_power_restore(host);
1020 mmc_release_host(host);
1021
1022 return ret;
1023}
1024
1025static int mmc_sdio_reset(struct mmc_host *host)
1026{
1027 mmc_power_cycle(host, host->card->ocr);
1028 return mmc_sdio_power_restore(host);
1029}
1030
1031static const struct mmc_bus_ops mmc_sdio_ops = {
1032 .remove = mmc_sdio_remove,
1033 .detect = mmc_sdio_detect,
1034 .pre_suspend = mmc_sdio_pre_suspend,
1035 .suspend = mmc_sdio_suspend,
1036 .resume = mmc_sdio_resume,
1037 .runtime_suspend = mmc_sdio_runtime_suspend,
1038 .runtime_resume = mmc_sdio_runtime_resume,
1039 .power_restore = mmc_sdio_power_restore,
1040 .alive = mmc_sdio_alive,
1041 .reset = mmc_sdio_reset,
1042};
1043
1044
1045/*
1046 * Starting point for SDIO card init.
1047 */
1048int mmc_attach_sdio(struct mmc_host *host)
1049{
1050 int err, i, funcs;
1051 u32 ocr, rocr;
1052 struct mmc_card *card;
1053
1054 WARN_ON(!host->claimed);
1055
1056 err = mmc_send_io_op_cond(host, 0, &ocr);
1057 if (err)
1058 return err;
1059
1060 mmc_attach_bus(host, &mmc_sdio_ops);
1061 if (host->ocr_avail_sdio)
1062 host->ocr_avail = host->ocr_avail_sdio;
1063
1064
1065 rocr = mmc_select_voltage(host, ocr);
1066
1067 /*
1068 * Can we support the voltage(s) of the card(s)?
1069 */
1070 if (!rocr) {
1071 err = -EINVAL;
1072 goto err;
1073 }
1074
1075 /*
1076 * Detect and init the card.
1077 */
1078 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1079 if (err)
1080 goto err;
1081
1082 card = host->card;
1083
1084 /*
1085 * Enable runtime PM only if supported by host+card+board
1086 */
1087 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1088 /*
1089 * Let runtime PM core know our card is active
1090 */
1091 err = pm_runtime_set_active(&card->dev);
1092 if (err)
1093 goto remove;
1094
1095 /*
1096 * Enable runtime PM for this card
1097 */
1098 pm_runtime_enable(&card->dev);
1099 }
1100
1101 /*
1102 * The number of functions on the card is encoded inside
1103 * the ocr.
1104 */
1105 funcs = (ocr & 0x70000000) >> 28;
1106 card->sdio_funcs = 0;
1107
1108 /*
1109 * Initialize (but don't add) all present functions.
1110 */
1111 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1112 err = sdio_init_func(host->card, i + 1);
1113 if (err)
1114 goto remove;
1115
1116 /*
1117 * Enable Runtime PM for this func (if supported)
1118 */
1119 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1120 pm_runtime_enable(&card->sdio_func[i]->dev);
1121 }
1122
1123 /*
1124 * First add the card to the driver model...
1125 */
1126 mmc_release_host(host);
1127 err = mmc_add_card(host->card);
1128 if (err)
1129 goto remove_added;
1130
1131 /*
1132 * ...then the SDIO functions.
1133 */
1134 for (i = 0;i < funcs;i++) {
1135 err = sdio_add_func(host->card->sdio_func[i]);
1136 if (err)
1137 goto remove_added;
1138 }
1139
1140 mmc_claim_host(host);
1141 return 0;
1142
1143
1144remove_added:
1145 /* Remove without lock if the device has been added. */
1146 mmc_sdio_remove(host);
1147 mmc_claim_host(host);
1148remove:
1149 /* And with lock if it hasn't been added. */
1150 mmc_release_host(host);
1151 if (host->card)
1152 mmc_sdio_remove(host);
1153 mmc_claim_host(host);
1154err:
1155 mmc_detach_bus(host);
1156
1157 pr_err("%s: error %d whilst initialising SDIO card\n",
1158 mmc_hostname(host), err);
1159
1160 return err;
1161}
1162