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posix-clock: Fix return code on the poll method's error path
[linux/fpc-iii.git] / drivers / mmc / core / sdio.c
blob16d838e6d623be3968a7a900e85348d17a642fe3
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
31 static 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
57 out:
58 return ret;
59 }
60
61 static 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
92 fail:
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
101 static 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
199 out:
200 return ret;
201 }
202
203 static 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_warn("%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 */
239 static 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 */
260 static 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
291 static int sdio_enable_4bit_bus(struct mmc_card *card)
292 {
293 int err;
294
295 if (card->type == MMC_TYPE_SDIO)
296 err = sdio_enable_wide(card);
297 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
298 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
299 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
300 if (err)
301 return err;
302 err = sdio_enable_wide(card);
303 if (err <= 0)
304 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
305 } else
306 return 0;
307
308 if (err > 0) {
309 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
310 err = 0;
311 }
312
313 return err;
314 }
315
316
317 /*
318 * Test if the card supports high-speed mode and, if so, switch to it.
319 */
320 static 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 */
350 static 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
365 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
366 {
367 unsigned max_dtr;
368
369 if (mmc_card_hs(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
387 static 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
403 static void sdio_select_driver_type(struct mmc_card *card)
404 {
405 int card_drv_type, drive_strength, drv_type;
406 unsigned char card_strength;
407 int err;
408
409 card->drive_strength = 0;
410
411 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
412
413 drive_strength = mmc_select_drive_strength(card,
414 card->sw_caps.uhs_max_dtr,
415 card_drv_type, &drv_type);
416
417 if (drive_strength) {
418 /* if error just use default for drive strength B */
419 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
420 &card_strength);
421 if (err)
422 return;
423
424 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
425 card_strength |= host_drive_to_sdio_drive(drive_strength);
426
427 /* if error default to drive strength B */
428 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
429 card_strength, NULL);
430 if (err)
431 return;
432 card->drive_strength = drive_strength;
433 }
434
435 if (drv_type)
436 mmc_set_driver_type(card->host, drv_type);
437 }
438
439
440 static int sdio_set_bus_speed_mode(struct mmc_card *card)
441 {
442 unsigned int bus_speed, timing;
443 int err;
444 unsigned char speed;
445
446 /*
447 * If the host doesn't support any of the UHS-I modes, fallback on
448 * default speed.
449 */
450 if (!mmc_host_uhs(card->host))
451 return 0;
452
453 bus_speed = SDIO_SPEED_SDR12;
454 timing = MMC_TIMING_UHS_SDR12;
455 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
456 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
457 bus_speed = SDIO_SPEED_SDR104;
458 timing = MMC_TIMING_UHS_SDR104;
459 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
460 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
461 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
462 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
463 bus_speed = SDIO_SPEED_DDR50;
464 timing = MMC_TIMING_UHS_DDR50;
465 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
466 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
467 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
468 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
469 SD_MODE_UHS_SDR50)) {
470 bus_speed = SDIO_SPEED_SDR50;
471 timing = MMC_TIMING_UHS_SDR50;
472 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
473 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
474 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
475 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
476 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
477 bus_speed = SDIO_SPEED_SDR25;
478 timing = MMC_TIMING_UHS_SDR25;
479 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
480 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
481 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
482 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
483 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
484 SD_MODE_UHS_SDR12)) {
485 bus_speed = SDIO_SPEED_SDR12;
486 timing = MMC_TIMING_UHS_SDR12;
487 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
488 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
489 }
490
491 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
492 if (err)
493 return err;
494
495 speed &= ~SDIO_SPEED_BSS_MASK;
496 speed |= bus_speed;
497 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
498 if (err)
499 return err;
500
501 if (bus_speed) {
502 mmc_set_timing(card->host, timing);
503 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
504 }
505
506 return 0;
507 }
508
509 /*
510 * UHS-I specific initialization procedure
511 */
512 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
513 {
514 int err;
515
516 if (!card->scr.sda_spec3)
517 return 0;
518
519 /*
520 * Switch to wider bus (if supported).
521 */
522 if (card->host->caps & MMC_CAP_4_BIT_DATA)
523 err = sdio_enable_4bit_bus(card);
524
525 /* Set the driver strength for the card */
526 sdio_select_driver_type(card);
527
528 /* Set bus speed mode of the card */
529 err = sdio_set_bus_speed_mode(card);
530 if (err)
531 goto out;
532
533 /*
534 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
535 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
536 */
537 if (!mmc_host_is_spi(card->host) &&
538 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
539 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)))
540 err = mmc_execute_tuning(card);
541 out:
542 return err;
543 }
544
545 /*
546 * Handle the detection and initialisation of a card.
547 *
548 * In the case of a resume, "oldcard" will contain the card
549 * we're trying to reinitialise.
550 */
551 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
552 struct mmc_card *oldcard, int powered_resume)
553 {
554 struct mmc_card *card;
555 int err;
556 int retries = 10;
557 u32 rocr = 0;
558 u32 ocr_card = ocr;
559
560 BUG_ON(!host);
561 WARN_ON(!host->claimed);
562
563 /* to query card if 1.8V signalling is supported */
564 if (mmc_host_uhs(host))
565 ocr |= R4_18V_PRESENT;
566
567 try_again:
568 if (!retries) {
569 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
570 ocr &= ~R4_18V_PRESENT;
571 }
572
573 /*
574 * Inform the card of the voltage
575 */
576 if (!powered_resume) {
577 err = mmc_send_io_op_cond(host, ocr, &rocr);
578 if (err)
579 goto err;
580 }
581
582 /*
583 * For SPI, enable CRC as appropriate.
584 */
585 if (mmc_host_is_spi(host)) {
586 err = mmc_spi_set_crc(host, use_spi_crc);
587 if (err)
588 goto err;
589 }
590
591 /*
592 * Allocate card structure.
593 */
594 card = mmc_alloc_card(host, NULL);
595 if (IS_ERR(card)) {
596 err = PTR_ERR(card);
597 goto err;
598 }
599
600 if ((rocr & R4_MEMORY_PRESENT) &&
601 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
602 card->type = MMC_TYPE_SD_COMBO;
603
604 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
605 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
606 mmc_remove_card(card);
607 return -ENOENT;
608 }
609 } else {
610 card->type = MMC_TYPE_SDIO;
611
612 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
613 mmc_remove_card(card);
614 return -ENOENT;
615 }
616 }
617
618 /*
619 * Call the optional HC's init_card function to handle quirks.
620 */
621 if (host->ops->init_card)
622 host->ops->init_card(host, card);
623
624 /*
625 * If the host and card support UHS-I mode request the card
626 * to switch to 1.8V signaling level. No 1.8v signalling if
627 * UHS mode is not enabled to maintain compatibility and some
628 * systems that claim 1.8v signalling in fact do not support
629 * it.
630 */
631 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
632 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
633 ocr);
634 if (err == -EAGAIN) {
635 sdio_reset(host);
636 mmc_go_idle(host);
637 mmc_send_if_cond(host, host->ocr_avail);
638 mmc_remove_card(card);
639 retries--;
640 goto try_again;
641 } else if (err) {
642 ocr &= ~R4_18V_PRESENT;
643 }
644 err = 0;
645 } else {
646 ocr &= ~R4_18V_PRESENT;
647 }
648
649 /*
650 * For native busses: set card RCA and quit open drain mode.
651 */
652 if (!powered_resume && !mmc_host_is_spi(host)) {
653 err = mmc_send_relative_addr(host, &card->rca);
654 if (err)
655 goto remove;
656
657 /*
658 * Update oldcard with the new RCA received from the SDIO
659 * device -- we're doing this so that it's updated in the
660 * "card" struct when oldcard overwrites that later.
661 */
662 if (oldcard)
663 oldcard->rca = card->rca;
664 }
665
666 /*
667 * Read CSD, before selecting the card
668 */
669 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
670 err = mmc_sd_get_csd(host, card);
671 if (err)
672 return err;
673
674 mmc_decode_cid(card);
675 }
676
677 /*
678 * Select card, as all following commands rely on that.
679 */
680 if (!powered_resume && !mmc_host_is_spi(host)) {
681 err = mmc_select_card(card);
682 if (err)
683 goto remove;
684 }
685
686 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
687 /*
688 * This is non-standard SDIO device, meaning it doesn't
689 * have any CIA (Common I/O area) registers present.
690 * It's host's responsibility to fill cccr and cis
691 * structures in init_card().
692 */
693 mmc_set_clock(host, card->cis.max_dtr);
694
695 if (card->cccr.high_speed) {
696 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
697 }
698
699 goto finish;
700 }
701
702 /*
703 * Read the common registers.
704 */
705 err = sdio_read_cccr(card, ocr);
706 if (err)
707 goto remove;
708
709 /*
710 * Read the common CIS tuples.
711 */
712 err = sdio_read_common_cis(card);
713 if (err)
714 goto remove;
715
716 if (oldcard) {
717 int same = (card->cis.vendor == oldcard->cis.vendor &&
718 card->cis.device == oldcard->cis.device);
719 mmc_remove_card(card);
720 if (!same)
721 return -ENOENT;
722
723 card = oldcard;
724 }
725 card->ocr = ocr_card;
726 mmc_fixup_device(card, NULL);
727
728 if (card->type == MMC_TYPE_SD_COMBO) {
729 err = mmc_sd_setup_card(host, card, oldcard != NULL);
730 /* handle as SDIO-only card if memory init failed */
731 if (err) {
732 mmc_go_idle(host);
733 if (mmc_host_is_spi(host))
734 /* should not fail, as it worked previously */
735 mmc_spi_set_crc(host, use_spi_crc);
736 card->type = MMC_TYPE_SDIO;
737 } else
738 card->dev.type = &sd_type;
739 }
740
741 /*
742 * If needed, disconnect card detection pull-up resistor.
743 */
744 err = sdio_disable_cd(card);
745 if (err)
746 goto remove;
747
748 /* Initialization sequence for UHS-I cards */
749 /* Only if card supports 1.8v and UHS signaling */
750 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
751 err = mmc_sdio_init_uhs_card(card);
752 if (err)
753 goto remove;
754 } else {
755 /*
756 * Switch to high-speed (if supported).
757 */
758 err = sdio_enable_hs(card);
759 if (err > 0)
760 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
761 else if (err)
762 goto remove;
763
764 /*
765 * Change to the card's maximum speed.
766 */
767 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
768
769 /*
770 * Switch to wider bus (if supported).
771 */
772 err = sdio_enable_4bit_bus(card);
773 if (err)
774 goto remove;
775 }
776 finish:
777 if (!oldcard)
778 host->card = card;
779 return 0;
780
781 remove:
782 if (!oldcard)
783 mmc_remove_card(card);
784
785 err:
786 return err;
787 }
788
789 /*
790 * Host is being removed. Free up the current card.
791 */
792 static void mmc_sdio_remove(struct mmc_host *host)
793 {
794 int i;
795
796 BUG_ON(!host);
797 BUG_ON(!host->card);
798
799 for (i = 0;i < host->card->sdio_funcs;i++) {
800 if (host->card->sdio_func[i]) {
801 sdio_remove_func(host->card->sdio_func[i]);
802 host->card->sdio_func[i] = NULL;
803 }
804 }
805
806 mmc_remove_card(host->card);
807 host->card = NULL;
808 }
809
810 /*
811 * Card detection - card is alive.
812 */
813 static int mmc_sdio_alive(struct mmc_host *host)
814 {
815 return mmc_select_card(host->card);
816 }
817
818 /*
819 * Card detection callback from host.
820 */
821 static void mmc_sdio_detect(struct mmc_host *host)
822 {
823 int err;
824
825 BUG_ON(!host);
826 BUG_ON(!host->card);
827
828 /* Make sure card is powered before detecting it */
829 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
830 err = pm_runtime_get_sync(&host->card->dev);
831 if (err < 0) {
832 pm_runtime_put_noidle(&host->card->dev);
833 goto out;
834 }
835 }
836
837 mmc_claim_host(host);
838
839 /*
840 * Just check if our card has been removed.
841 */
842 err = _mmc_detect_card_removed(host);
843
844 mmc_release_host(host);
845
846 /*
847 * Tell PM core it's OK to power off the card now.
848 *
849 * The _sync variant is used in order to ensure that the card
850 * is left powered off in case an error occurred, and the card
851 * is going to be removed.
852 *
853 * Since there is no specific reason to believe a new user
854 * is about to show up at this point, the _sync variant is
855 * desirable anyway.
856 */
857 if (host->caps & MMC_CAP_POWER_OFF_CARD)
858 pm_runtime_put_sync(&host->card->dev);
859
860 out:
861 if (err) {
862 mmc_sdio_remove(host);
863
864 mmc_claim_host(host);
865 mmc_detach_bus(host);
866 mmc_power_off(host);
867 mmc_release_host(host);
868 }
869 }
870
871 /*
872 * SDIO pre_suspend. We need to suspend all functions separately.
873 * Therefore all registered functions must have drivers with suspend
874 * and resume methods. Failing that we simply remove the whole card.
875 */
876 static int mmc_sdio_pre_suspend(struct mmc_host *host)
877 {
878 int i, err = 0;
879
880 for (i = 0; i < host->card->sdio_funcs; i++) {
881 struct sdio_func *func = host->card->sdio_func[i];
882 if (func && sdio_func_present(func) && func->dev.driver) {
883 const struct dev_pm_ops *pmops = func->dev.driver->pm;
884 if (!pmops || !pmops->suspend || !pmops->resume) {
885 /* force removal of entire card in that case */
886 err = -ENOSYS;
887 break;
888 }
889 }
890 }
891
892 return err;
893 }
894
895 /*
896 * SDIO suspend. Suspend all functions separately.
897 */
898 static int mmc_sdio_suspend(struct mmc_host *host)
899 {
900 mmc_claim_host(host);
901
902 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
903 sdio_disable_wide(host->card);
904
905 if (!mmc_card_keep_power(host)) {
906 mmc_power_off(host);
907 } else if (host->retune_period) {
908 mmc_retune_timer_stop(host);
909 mmc_retune_needed(host);
910 }
911
912 mmc_release_host(host);
913
914 return 0;
915 }
916
917 static int mmc_sdio_resume(struct mmc_host *host)
918 {
919 int err = 0;
920
921 BUG_ON(!host);
922 BUG_ON(!host->card);
923
924 /* Basic card reinitialization. */
925 mmc_claim_host(host);
926
927 /* Restore power if needed */
928 if (!mmc_card_keep_power(host)) {
929 mmc_power_up(host, host->card->ocr);
930 /*
931 * Tell runtime PM core we just powered up the card,
932 * since it still believes the card is powered off.
933 * Note that currently runtime PM is only enabled
934 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
935 */
936 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
937 pm_runtime_disable(&host->card->dev);
938 pm_runtime_set_active(&host->card->dev);
939 pm_runtime_enable(&host->card->dev);
940 }
941 }
942
943 /* No need to reinitialize powered-resumed nonremovable cards */
944 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
945 sdio_reset(host);
946 mmc_go_idle(host);
947 mmc_send_if_cond(host, host->card->ocr);
948 err = mmc_send_io_op_cond(host, 0, NULL);
949 if (!err)
950 err = mmc_sdio_init_card(host, host->card->ocr,
951 host->card,
952 mmc_card_keep_power(host));
953 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
954 /* We may have switched to 1-bit mode during suspend */
955 err = sdio_enable_4bit_bus(host->card);
956 }
957
958 if (!err && host->sdio_irqs) {
959 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
960 wake_up_process(host->sdio_irq_thread);
961 else if (host->caps & MMC_CAP_SDIO_IRQ)
962 host->ops->enable_sdio_irq(host, 1);
963 }
964
965 mmc_release_host(host);
966
967 host->pm_flags &= ~MMC_PM_KEEP_POWER;
968 return err;
969 }
970
971 static int mmc_sdio_power_restore(struct mmc_host *host)
972 {
973 int ret;
974
975 BUG_ON(!host);
976 BUG_ON(!host->card);
977
978 mmc_claim_host(host);
979
980 /*
981 * Reset the card by performing the same steps that are taken by
982 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
983 *
984 * sdio_reset() is technically not needed. Having just powered up the
985 * hardware, it should already be in reset state. However, some
986 * platforms (such as SD8686 on OLPC) do not instantly cut power,
987 * meaning that a reset is required when restoring power soon after
988 * powering off. It is harmless in other cases.
989 *
990 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
991 * is not necessary for non-removable cards. However, it is required
992 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
993 * harmless in other situations.
994 *
995 */
996
997 sdio_reset(host);
998 mmc_go_idle(host);
999 mmc_send_if_cond(host, host->card->ocr);
1000
1001 ret = mmc_send_io_op_cond(host, 0, NULL);
1002 if (ret)
1003 goto out;
1004
1005 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1006 mmc_card_keep_power(host));
1007 if (!ret && host->sdio_irqs)
1008 mmc_signal_sdio_irq(host);
1009
1010 out:
1011 mmc_release_host(host);
1012
1013 return ret;
1014 }
1015
1016 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1017 {
1018 /* No references to the card, cut the power to it. */
1019 mmc_claim_host(host);
1020 mmc_power_off(host);
1021 mmc_release_host(host);
1022
1023 return 0;
1024 }
1025
1026 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1027 {
1028 int ret;
1029
1030 /* Restore power and re-initialize. */
1031 mmc_claim_host(host);
1032 mmc_power_up(host, host->card->ocr);
1033 ret = mmc_sdio_power_restore(host);
1034 mmc_release_host(host);
1035
1036 return ret;
1037 }
1038
1039 static int mmc_sdio_reset(struct mmc_host *host)
1040 {
1041 mmc_power_cycle(host, host->card->ocr);
1042 return mmc_sdio_power_restore(host);
1043 }
1044
1045 static const struct mmc_bus_ops mmc_sdio_ops = {
1046 .remove = mmc_sdio_remove,
1047 .detect = mmc_sdio_detect,
1048 .pre_suspend = mmc_sdio_pre_suspend,
1049 .suspend = mmc_sdio_suspend,
1050 .resume = mmc_sdio_resume,
1051 .runtime_suspend = mmc_sdio_runtime_suspend,
1052 .runtime_resume = mmc_sdio_runtime_resume,
1053 .power_restore = mmc_sdio_power_restore,
1054 .alive = mmc_sdio_alive,
1055 .reset = mmc_sdio_reset,
1056 };
1057
1058
1059 /*
1060 * Starting point for SDIO card init.
1061 */
1062 int mmc_attach_sdio(struct mmc_host *host)
1063 {
1064 int err, i, funcs;
1065 u32 ocr, rocr;
1066 struct mmc_card *card;
1067
1068 BUG_ON(!host);
1069 WARN_ON(!host->claimed);
1070
1071 err = mmc_send_io_op_cond(host, 0, &ocr);
1072 if (err)
1073 return err;
1074
1075 mmc_attach_bus(host, &mmc_sdio_ops);
1076 if (host->ocr_avail_sdio)
1077 host->ocr_avail = host->ocr_avail_sdio;
1078
1079
1080 rocr = mmc_select_voltage(host, ocr);
1081
1082 /*
1083 * Can we support the voltage(s) of the card(s)?
1084 */
1085 if (!rocr) {
1086 err = -EINVAL;
1087 goto err;
1088 }
1089
1090 /*
1091 * Detect and init the card.
1092 */
1093 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1094 if (err)
1095 goto err;
1096
1097 card = host->card;
1098
1099 /*
1100 * Enable runtime PM only if supported by host+card+board
1101 */
1102 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1103 /*
1104 * Let runtime PM core know our card is active
1105 */
1106 err = pm_runtime_set_active(&card->dev);
1107 if (err)
1108 goto remove;
1109
1110 /*
1111 * Enable runtime PM for this card
1112 */
1113 pm_runtime_enable(&card->dev);
1114 }
1115
1116 /*
1117 * The number of functions on the card is encoded inside
1118 * the ocr.
1119 */
1120 funcs = (ocr & 0x70000000) >> 28;
1121 card->sdio_funcs = 0;
1122
1123 /*
1124 * Initialize (but don't add) all present functions.
1125 */
1126 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1127 err = sdio_init_func(host->card, i + 1);
1128 if (err)
1129 goto remove;
1130
1131 /*
1132 * Enable Runtime PM for this func (if supported)
1133 */
1134 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1135 pm_runtime_enable(&card->sdio_func[i]->dev);
1136 }
1137
1138 /*
1139 * First add the card to the driver model...
1140 */
1141 mmc_release_host(host);
1142 err = mmc_add_card(host->card);
1143 if (err)
1144 goto remove_added;
1145
1146 /*
1147 * ...then the SDIO functions.
1148 */
1149 for (i = 0;i < funcs;i++) {
1150 err = sdio_add_func(host->card->sdio_func[i]);
1151 if (err)
1152 goto remove_added;
1153 }
1154
1155 mmc_claim_host(host);
1156 return 0;
1157
1158
1159 remove_added:
1160 /* Remove without lock if the device has been added. */
1161 mmc_sdio_remove(host);
1162 mmc_claim_host(host);
1163 remove:
1164 /* And with lock if it hasn't been added. */
1165 mmc_release_host(host);
1166 if (host->card)
1167 mmc_sdio_remove(host);
1168 mmc_claim_host(host);
1169 err:
1170 mmc_detach_bus(host);
1171
1172 pr_err("%s: error %d whilst initialising SDIO card\n",
1173 mmc_hostname(host), err);
1174
1175 return err;
1176 }
1177
Linux with added FPC-III support