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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / mmc / core / sdio.c
blob2c7c83f832d289c25eaf83cf4d7ef32d420fb002
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 (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
202 out:
203 return ret;
204 }
205
206 static 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 ctrl |= SDIO_BUS_WIDTH_4BIT;
222
223 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
224 if (ret)
225 return ret;
226
227 return 1;
228 }
229
230 /*
231 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
232 * of the card. This may be required on certain setups of boards,
233 * controllers and embedded sdio device which do not need the card's
234 * pull-up. As a result, card detection is disabled and power is saved.
235 */
236 static int sdio_disable_cd(struct mmc_card *card)
237 {
238 int ret;
239 u8 ctrl;
240
241 if (!mmc_card_disable_cd(card))
242 return 0;
243
244 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
245 if (ret)
246 return ret;
247
248 ctrl |= SDIO_BUS_CD_DISABLE;
249
250 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
251 }
252
253 /*
254 * Devices that remain active during a system suspend are
255 * put back into 1-bit mode.
256 */
257 static int sdio_disable_wide(struct mmc_card *card)
258 {
259 int ret;
260 u8 ctrl;
261
262 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
263 return 0;
264
265 if (card->cccr.low_speed && !card->cccr.wide_bus)
266 return 0;
267
268 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
269 if (ret)
270 return ret;
271
272 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
273 return 0;
274
275 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
276 ctrl |= SDIO_BUS_ASYNC_INT;
277
278 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
279 if (ret)
280 return ret;
281
282 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
283
284 return 0;
285 }
286
287
288 static int sdio_enable_4bit_bus(struct mmc_card *card)
289 {
290 int err;
291
292 if (card->type == MMC_TYPE_SDIO)
293 return sdio_enable_wide(card);
294
295 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
296 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
297 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
298 if (err)
299 return err;
300 } else
301 return 0;
302
303 err = sdio_enable_wide(card);
304 if (err <= 0)
305 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
306
307 return err;
308 }
309
310
311 /*
312 * Test if the card supports high-speed mode and, if so, switch to it.
313 */
314 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
315 {
316 int ret;
317 u8 speed;
318
319 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
320 return 0;
321
322 if (!card->cccr.high_speed)
323 return 0;
324
325 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
326 if (ret)
327 return ret;
328
329 if (enable)
330 speed |= SDIO_SPEED_EHS;
331 else
332 speed &= ~SDIO_SPEED_EHS;
333
334 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
335 if (ret)
336 return ret;
337
338 return 1;
339 }
340
341 /*
342 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
343 */
344 static int sdio_enable_hs(struct mmc_card *card)
345 {
346 int ret;
347
348 ret = mmc_sdio_switch_hs(card, true);
349 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
350 return ret;
351
352 ret = mmc_sd_switch_hs(card);
353 if (ret <= 0)
354 mmc_sdio_switch_hs(card, false);
355
356 return ret;
357 }
358
359 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
360 {
361 unsigned max_dtr;
362
363 if (mmc_card_highspeed(card)) {
364 /*
365 * The SDIO specification doesn't mention how
366 * the CIS transfer speed register relates to
367 * high-speed, but it seems that 50 MHz is
368 * mandatory.
369 */
370 max_dtr = 50000000;
371 } else {
372 max_dtr = card->cis.max_dtr;
373 }
374
375 if (card->type == MMC_TYPE_SD_COMBO)
376 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
377
378 return max_dtr;
379 }
380
381 static unsigned char host_drive_to_sdio_drive(int host_strength)
382 {
383 switch (host_strength) {
384 case MMC_SET_DRIVER_TYPE_A:
385 return SDIO_DTSx_SET_TYPE_A;
386 case MMC_SET_DRIVER_TYPE_B:
387 return SDIO_DTSx_SET_TYPE_B;
388 case MMC_SET_DRIVER_TYPE_C:
389 return SDIO_DTSx_SET_TYPE_C;
390 case MMC_SET_DRIVER_TYPE_D:
391 return SDIO_DTSx_SET_TYPE_D;
392 default:
393 return SDIO_DTSx_SET_TYPE_B;
394 }
395 }
396
397 static void sdio_select_driver_type(struct mmc_card *card)
398 {
399 int host_drv_type = SD_DRIVER_TYPE_B;
400 int card_drv_type = SD_DRIVER_TYPE_B;
401 int drive_strength;
402 unsigned char card_strength;
403 int err;
404
405 /*
406 * If the host doesn't support any of the Driver Types A,C or D,
407 * or there is no board specific handler then default Driver
408 * Type B is used.
409 */
410 if (!(card->host->caps &
411 (MMC_CAP_DRIVER_TYPE_A |
412 MMC_CAP_DRIVER_TYPE_C |
413 MMC_CAP_DRIVER_TYPE_D)))
414 return;
415
416 if (!card->host->ops->select_drive_strength)
417 return;
418
419 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
420 host_drv_type |= SD_DRIVER_TYPE_A;
421
422 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
423 host_drv_type |= SD_DRIVER_TYPE_C;
424
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
426 host_drv_type |= SD_DRIVER_TYPE_D;
427
428 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
429 card_drv_type |= SD_DRIVER_TYPE_A;
430
431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
432 card_drv_type |= SD_DRIVER_TYPE_C;
433
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
435 card_drv_type |= SD_DRIVER_TYPE_D;
436
437 /*
438 * The drive strength that the hardware can support
439 * depends on the board design. Pass the appropriate
440 * information and let the hardware specific code
441 * return what is possible given the options
442 */
443 drive_strength = card->host->ops->select_drive_strength(
444 card->sw_caps.uhs_max_dtr,
445 host_drv_type, card_drv_type);
446
447 /* if error just use default for drive strength B */
448 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
449 &card_strength);
450 if (err)
451 return;
452
453 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
454 card_strength |= host_drive_to_sdio_drive(drive_strength);
455
456 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
457 card_strength, NULL);
458
459 /* if error default to drive strength B */
460 if (!err)
461 mmc_set_driver_type(card->host, drive_strength);
462 }
463
464
465 static int sdio_set_bus_speed_mode(struct mmc_card *card)
466 {
467 unsigned int bus_speed, timing;
468 int err;
469 unsigned char speed;
470
471 /*
472 * If the host doesn't support any of the UHS-I modes, fallback on
473 * default speed.
474 */
475 if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
476 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_DDR50)))
477 return 0;
478
479 bus_speed = SDIO_SPEED_SDR12;
480 timing = MMC_TIMING_UHS_SDR12;
481 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
482 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
483 bus_speed = SDIO_SPEED_SDR104;
484 timing = MMC_TIMING_UHS_SDR104;
485 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
486 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
487 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
488 bus_speed = SDIO_SPEED_DDR50;
489 timing = MMC_TIMING_UHS_DDR50;
490 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
491 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
492 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
493 SD_MODE_UHS_SDR50)) {
494 bus_speed = SDIO_SPEED_SDR50;
495 timing = MMC_TIMING_UHS_SDR50;
496 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
499 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
500 bus_speed = SDIO_SPEED_SDR25;
501 timing = MMC_TIMING_UHS_SDR25;
502 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
503 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
504 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
505 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
506 SD_MODE_UHS_SDR12)) {
507 bus_speed = SDIO_SPEED_SDR12;
508 timing = MMC_TIMING_UHS_SDR12;
509 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
510 }
511
512 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
513 if (err)
514 return err;
515
516 speed &= ~SDIO_SPEED_BSS_MASK;
517 speed |= bus_speed;
518 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
519 if (err)
520 return err;
521
522 if (bus_speed) {
523 mmc_set_timing(card->host, timing);
524 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
525 }
526
527 return 0;
528 }
529
530 /*
531 * UHS-I specific initialization procedure
532 */
533 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
534 {
535 int err;
536
537 if (!card->scr.sda_spec3)
538 return 0;
539
540 /*
541 * Switch to wider bus (if supported).
542 */
543 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
544 err = sdio_enable_4bit_bus(card);
545 if (err > 0) {
546 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
547 err = 0;
548 }
549 }
550
551 /* Set the driver strength for the card */
552 sdio_select_driver_type(card);
553
554 /* Set bus speed mode of the card */
555 err = sdio_set_bus_speed_mode(card);
556 if (err)
557 goto out;
558
559 /* Initialize and start re-tuning timer */
560 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
561 err = card->host->ops->execute_tuning(card->host,
562 MMC_SEND_TUNING_BLOCK);
563
564 out:
565
566 return err;
567 }
568
569 /*
570 * Handle the detection and initialisation of a card.
571 *
572 * In the case of a resume, "oldcard" will contain the card
573 * we're trying to reinitialise.
574 */
575 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
576 struct mmc_card *oldcard, int powered_resume)
577 {
578 struct mmc_card *card;
579 int err;
580
581 BUG_ON(!host);
582 WARN_ON(!host->claimed);
583
584 /*
585 * Inform the card of the voltage
586 */
587 if (!powered_resume) {
588 /* The initialization should be done at 3.3 V I/O voltage. */
589 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
590
591 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
592 if (err)
593 goto err;
594 }
595
596 /*
597 * For SPI, enable CRC as appropriate.
598 */
599 if (mmc_host_is_spi(host)) {
600 err = mmc_spi_set_crc(host, use_spi_crc);
601 if (err)
602 goto err;
603 }
604
605 /*
606 * Allocate card structure.
607 */
608 card = mmc_alloc_card(host, NULL);
609 if (IS_ERR(card)) {
610 err = PTR_ERR(card);
611 goto err;
612 }
613
614 if ((ocr & R4_MEMORY_PRESENT) &&
615 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
616 card->type = MMC_TYPE_SD_COMBO;
617
618 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
619 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
620 mmc_remove_card(card);
621 return -ENOENT;
622 }
623 } else {
624 card->type = MMC_TYPE_SDIO;
625
626 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
627 mmc_remove_card(card);
628 return -ENOENT;
629 }
630 }
631
632 /*
633 * Call the optional HC's init_card function to handle quirks.
634 */
635 if (host->ops->init_card)
636 host->ops->init_card(host, card);
637
638 /*
639 * If the host and card support UHS-I mode request the card
640 * to switch to 1.8V signaling level. No 1.8v signalling if
641 * UHS mode is not enabled to maintain compatibilty and some
642 * systems that claim 1.8v signalling in fact do not support
643 * it.
644 */
645 if ((ocr & R4_18V_PRESENT) &&
646 (host->caps &
647 (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
648 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104 |
649 MMC_CAP_UHS_DDR50))) {
650 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
651 true);
652 if (err) {
653 ocr &= ~R4_18V_PRESENT;
654 host->ocr &= ~R4_18V_PRESENT;
655 }
656 err = 0;
657 } else {
658 ocr &= ~R4_18V_PRESENT;
659 host->ocr &= ~R4_18V_PRESENT;
660 }
661
662 /*
663 * For native busses: set card RCA and quit open drain mode.
664 */
665 if (!powered_resume && !mmc_host_is_spi(host)) {
666 err = mmc_send_relative_addr(host, &card->rca);
667 if (err)
668 goto remove;
669
670 /*
671 * Update oldcard with the new RCA received from the SDIO
672 * device -- we're doing this so that it's updated in the
673 * "card" struct when oldcard overwrites that later.
674 */
675 if (oldcard)
676 oldcard->rca = card->rca;
677 }
678
679 /*
680 * Read CSD, before selecting the card
681 */
682 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
683 err = mmc_sd_get_csd(host, card);
684 if (err)
685 return err;
686
687 mmc_decode_cid(card);
688 }
689
690 /*
691 * Select card, as all following commands rely on that.
692 */
693 if (!powered_resume && !mmc_host_is_spi(host)) {
694 err = mmc_select_card(card);
695 if (err)
696 goto remove;
697 }
698
699 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
700 /*
701 * This is non-standard SDIO device, meaning it doesn't
702 * have any CIA (Common I/O area) registers present.
703 * It's host's responsibility to fill cccr and cis
704 * structures in init_card().
705 */
706 mmc_set_clock(host, card->cis.max_dtr);
707
708 if (card->cccr.high_speed) {
709 mmc_card_set_highspeed(card);
710 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
711 }
712
713 goto finish;
714 }
715
716 /*
717 * Read the common registers.
718 */
719 err = sdio_read_cccr(card, ocr);
720 if (err)
721 goto remove;
722
723 /*
724 * Read the common CIS tuples.
725 */
726 err = sdio_read_common_cis(card);
727 if (err)
728 goto remove;
729
730 if (oldcard) {
731 int same = (card->cis.vendor == oldcard->cis.vendor &&
732 card->cis.device == oldcard->cis.device);
733 mmc_remove_card(card);
734 if (!same)
735 return -ENOENT;
736
737 card = oldcard;
738 }
739 mmc_fixup_device(card, NULL);
740
741 if (card->type == MMC_TYPE_SD_COMBO) {
742 err = mmc_sd_setup_card(host, card, oldcard != NULL);
743 /* handle as SDIO-only card if memory init failed */
744 if (err) {
745 mmc_go_idle(host);
746 if (mmc_host_is_spi(host))
747 /* should not fail, as it worked previously */
748 mmc_spi_set_crc(host, use_spi_crc);
749 card->type = MMC_TYPE_SDIO;
750 } else
751 card->dev.type = &sd_type;
752 }
753
754 /*
755 * If needed, disconnect card detection pull-up resistor.
756 */
757 err = sdio_disable_cd(card);
758 if (err)
759 goto remove;
760
761 /* Initialization sequence for UHS-I cards */
762 /* Only if card supports 1.8v and UHS signaling */
763 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
764 err = mmc_sdio_init_uhs_card(card);
765 if (err)
766 goto remove;
767
768 /* Card is an ultra-high-speed card */
769 mmc_card_set_uhs(card);
770 } else {
771 /*
772 * Switch to high-speed (if supported).
773 */
774 err = sdio_enable_hs(card);
775 if (err > 0)
776 mmc_sd_go_highspeed(card);
777 else if (err)
778 goto remove;
779
780 /*
781 * Change to the card's maximum speed.
782 */
783 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
784
785 /*
786 * Switch to wider bus (if supported).
787 */
788 err = sdio_enable_4bit_bus(card);
789 if (err > 0)
790 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
791 else if (err)
792 goto remove;
793 }
794 finish:
795 if (!oldcard)
796 host->card = card;
797 return 0;
798
799 remove:
800 if (!oldcard)
801 mmc_remove_card(card);
802
803 err:
804 return err;
805 }
806
807 /*
808 * Host is being removed. Free up the current card.
809 */
810 static void mmc_sdio_remove(struct mmc_host *host)
811 {
812 int i;
813
814 BUG_ON(!host);
815 BUG_ON(!host->card);
816
817 for (i = 0;i < host->card->sdio_funcs;i++) {
818 if (host->card->sdio_func[i]) {
819 sdio_remove_func(host->card->sdio_func[i]);
820 host->card->sdio_func[i] = NULL;
821 }
822 }
823
824 mmc_remove_card(host->card);
825 host->card = NULL;
826 }
827
828 /*
829 * Card detection - card is alive.
830 */
831 static int mmc_sdio_alive(struct mmc_host *host)
832 {
833 return mmc_select_card(host->card);
834 }
835
836 /*
837 * Card detection callback from host.
838 */
839 static void mmc_sdio_detect(struct mmc_host *host)
840 {
841 int err;
842
843 BUG_ON(!host);
844 BUG_ON(!host->card);
845
846 /* Make sure card is powered before detecting it */
847 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
848 err = pm_runtime_get_sync(&host->card->dev);
849 if (err < 0)
850 goto out;
851 }
852
853 mmc_claim_host(host);
854
855 /*
856 * Just check if our card has been removed.
857 */
858 err = _mmc_detect_card_removed(host);
859
860 mmc_release_host(host);
861
862 /*
863 * Tell PM core it's OK to power off the card now.
864 *
865 * The _sync variant is used in order to ensure that the card
866 * is left powered off in case an error occurred, and the card
867 * is going to be removed.
868 *
869 * Since there is no specific reason to believe a new user
870 * is about to show up at this point, the _sync variant is
871 * desirable anyway.
872 */
873 if (host->caps & MMC_CAP_POWER_OFF_CARD)
874 pm_runtime_put_sync(&host->card->dev);
875
876 out:
877 if (err) {
878 mmc_sdio_remove(host);
879
880 mmc_claim_host(host);
881 mmc_detach_bus(host);
882 mmc_power_off(host);
883 mmc_release_host(host);
884 }
885 }
886
887 /*
888 * SDIO suspend. We need to suspend all functions separately.
889 * Therefore all registered functions must have drivers with suspend
890 * and resume methods. Failing that we simply remove the whole card.
891 */
892 static int mmc_sdio_suspend(struct mmc_host *host)
893 {
894 int i, err = 0;
895
896 for (i = 0; i < host->card->sdio_funcs; i++) {
897 struct sdio_func *func = host->card->sdio_func[i];
898 if (func && sdio_func_present(func) && func->dev.driver) {
899 const struct dev_pm_ops *pmops = func->dev.driver->pm;
900 if (!pmops || !pmops->suspend || !pmops->resume) {
901 /* force removal of entire card in that case */
902 err = -ENOSYS;
903 } else
904 err = pmops->suspend(&func->dev);
905 if (err)
906 break;
907 }
908 }
909 while (err && --i >= 0) {
910 struct sdio_func *func = host->card->sdio_func[i];
911 if (func && sdio_func_present(func) && func->dev.driver) {
912 const struct dev_pm_ops *pmops = func->dev.driver->pm;
913 pmops->resume(&func->dev);
914 }
915 }
916
917 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
918 mmc_claim_host(host);
919 sdio_disable_wide(host->card);
920 mmc_release_host(host);
921 }
922
923 return err;
924 }
925
926 static int mmc_sdio_resume(struct mmc_host *host)
927 {
928 int i, err = 0;
929
930 BUG_ON(!host);
931 BUG_ON(!host->card);
932
933 /* Basic card reinitialization. */
934 mmc_claim_host(host);
935
936 /* No need to reinitialize powered-resumed nonremovable cards */
937 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
938 err = mmc_sdio_init_card(host, host->ocr, host->card,
939 mmc_card_keep_power(host));
940 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
941 /* We may have switched to 1-bit mode during suspend */
942 err = sdio_enable_4bit_bus(host->card);
943 if (err > 0) {
944 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
945 err = 0;
946 }
947 }
948
949 if (!err && host->sdio_irqs)
950 mmc_signal_sdio_irq(host);
951 mmc_release_host(host);
952
953 /*
954 * If the card looked to be the same as before suspending, then
955 * we proceed to resume all card functions. If one of them returns
956 * an error then we simply return that error to the core and the
957 * card will be redetected as new. It is the responsibility of
958 * the function driver to perform further tests with the extra
959 * knowledge it has of the card to confirm the card is indeed the
960 * same as before suspending (same MAC address for network cards,
961 * etc.) and return an error otherwise.
962 */
963 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
964 struct sdio_func *func = host->card->sdio_func[i];
965 if (func && sdio_func_present(func) && func->dev.driver) {
966 const struct dev_pm_ops *pmops = func->dev.driver->pm;
967 err = pmops->resume(&func->dev);
968 }
969 }
970
971 return err;
972 }
973
974 static int mmc_sdio_power_restore(struct mmc_host *host)
975 {
976 int ret;
977 u32 ocr;
978
979 BUG_ON(!host);
980 BUG_ON(!host->card);
981
982 mmc_claim_host(host);
983
984 /*
985 * Reset the card by performing the same steps that are taken by
986 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
987 *
988 * sdio_reset() is technically not needed. Having just powered up the
989 * hardware, it should already be in reset state. However, some
990 * platforms (such as SD8686 on OLPC) do not instantly cut power,
991 * meaning that a reset is required when restoring power soon after
992 * powering off. It is harmless in other cases.
993 *
994 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
995 * is not necessary for non-removable cards. However, it is required
996 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
997 * harmless in other situations.
998 *
999 * With these steps taken, mmc_select_voltage() is also required to
1000 * restore the correct voltage setting of the card.
1001 */
1002
1003 /* The initialization should be done at 3.3 V I/O voltage. */
1004 if (!mmc_card_keep_power(host))
1005 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1006
1007 sdio_reset(host);
1008 mmc_go_idle(host);
1009 mmc_send_if_cond(host, host->ocr_avail);
1010
1011 ret = mmc_send_io_op_cond(host, 0, &ocr);
1012 if (ret)
1013 goto out;
1014
1015 if (host->ocr_avail_sdio)
1016 host->ocr_avail = host->ocr_avail_sdio;
1017
1018 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1019 if (!host->ocr) {
1020 ret = -EINVAL;
1021 goto out;
1022 }
1023
1024 ret = mmc_sdio_init_card(host, host->ocr, host->card,
1025 mmc_card_keep_power(host));
1026 if (!ret && host->sdio_irqs)
1027 mmc_signal_sdio_irq(host);
1028
1029 out:
1030 mmc_release_host(host);
1031
1032 return ret;
1033 }
1034
1035 static const struct mmc_bus_ops mmc_sdio_ops = {
1036 .remove = mmc_sdio_remove,
1037 .detect = mmc_sdio_detect,
1038 .suspend = mmc_sdio_suspend,
1039 .resume = mmc_sdio_resume,
1040 .power_restore = mmc_sdio_power_restore,
1041 .alive = mmc_sdio_alive,
1042 };
1043
1044
1045 /*
1046 * Starting point for SDIO card init.
1047 */
1048 int mmc_attach_sdio(struct mmc_host *host)
1049 {
1050 int err, i, funcs;
1051 u32 ocr;
1052 struct mmc_card *card;
1053
1054 BUG_ON(!host);
1055 WARN_ON(!host->claimed);
1056
1057 err = mmc_send_io_op_cond(host, 0, &ocr);
1058 if (err)
1059 return err;
1060
1061 mmc_attach_bus(host, &mmc_sdio_ops);
1062 if (host->ocr_avail_sdio)
1063 host->ocr_avail = host->ocr_avail_sdio;
1064
1065 /*
1066 * Sanity check the voltages that the card claims to
1067 * support.
1068 */
1069 if (ocr & 0x7F) {
1070 pr_warning("%s: card claims to support voltages "
1071 "below the defined range. These will be ignored.\n",
1072 mmc_hostname(host));
1073 ocr &= ~0x7F;
1074 }
1075
1076 host->ocr = mmc_select_voltage(host, ocr);
1077
1078 /*
1079 * Can we support the voltage(s) of the card(s)?
1080 */
1081 if (!host->ocr) {
1082 err = -EINVAL;
1083 goto err;
1084 }
1085
1086 /*
1087 * Detect and init the card.
1088 */
1089 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1090 if (err) {
1091 if (err == -EAGAIN) {
1092 /*
1093 * Retry initialization with S18R set to 0.
1094 */
1095 host->ocr &= ~R4_18V_PRESENT;
1096 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1097 }
1098 if (err)
1099 goto err;
1100 }
1101 card = host->card;
1102
1103 /*
1104 * Enable runtime PM only if supported by host+card+board
1105 */
1106 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1107 /*
1108 * Let runtime PM core know our card is active
1109 */
1110 err = pm_runtime_set_active(&card->dev);
1111 if (err)
1112 goto remove;
1113
1114 /*
1115 * Enable runtime PM for this card
1116 */
1117 pm_runtime_enable(&card->dev);
1118 }
1119
1120 /*
1121 * The number of functions on the card is encoded inside
1122 * the ocr.
1123 */
1124 funcs = (ocr & 0x70000000) >> 28;
1125 card->sdio_funcs = 0;
1126
1127 /*
1128 * Initialize (but don't add) all present functions.
1129 */
1130 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1131 err = sdio_init_func(host->card, i + 1);
1132 if (err)
1133 goto remove;
1134
1135 /*
1136 * Enable Runtime PM for this func (if supported)
1137 */
1138 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1139 pm_runtime_enable(&card->sdio_func[i]->dev);
1140 }
1141
1142 /*
1143 * First add the card to the driver model...
1144 */
1145 mmc_release_host(host);
1146 err = mmc_add_card(host->card);
1147 if (err)
1148 goto remove_added;
1149
1150 /*
1151 * ...then the SDIO functions.
1152 */
1153 for (i = 0;i < funcs;i++) {
1154 err = sdio_add_func(host->card->sdio_func[i]);
1155 if (err)
1156 goto remove_added;
1157 }
1158
1159 mmc_claim_host(host);
1160 return 0;
1161
1162
1163 remove_added:
1164 /* Remove without lock if the device has been added. */
1165 mmc_sdio_remove(host);
1166 mmc_claim_host(host);
1167 remove:
1168 /* And with lock if it hasn't been added. */
1169 mmc_release_host(host);
1170 if (host->card)
1171 mmc_sdio_remove(host);
1172 mmc_claim_host(host);
1173 err:
1174 mmc_detach_bus(host);
1175
1176 pr_err("%s: error %d whilst initialising SDIO card\n",
1177 mmc_hostname(host), err);
1178
1179 return err;
1180 }
1181