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Linux 3.11-rc3
[cris-mirror.git] / drivers / mmc / core / sdio.c
blob80d89cff7306533071c8f7f71aac97205b942d31
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_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
220 mmc_hostname(card->host), ctrl);
221
222 /* set as 4-bit bus width */
223 ctrl &= ~SDIO_BUS_WIDTH_MASK;
224 ctrl |= SDIO_BUS_WIDTH_4BIT;
225
226 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
227 if (ret)
228 return ret;
229
230 return 1;
231 }
232
233 /*
234 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
235 * of the card. This may be required on certain setups of boards,
236 * controllers and embedded sdio device which do not need the card's
237 * pull-up. As a result, card detection is disabled and power is saved.
238 */
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 return sdio_enable_wide(card);
297
298 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
299 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
300 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
301 if (err)
302 return err;
303 } else
304 return 0;
305
306 err = sdio_enable_wide(card);
307 if (err <= 0)
308 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
309
310 return err;
311 }
312
313
314 /*
315 * Test if the card supports high-speed mode and, if so, switch to it.
316 */
317 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
318 {
319 int ret;
320 u8 speed;
321
322 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
323 return 0;
324
325 if (!card->cccr.high_speed)
326 return 0;
327
328 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
329 if (ret)
330 return ret;
331
332 if (enable)
333 speed |= SDIO_SPEED_EHS;
334 else
335 speed &= ~SDIO_SPEED_EHS;
336
337 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
338 if (ret)
339 return ret;
340
341 return 1;
342 }
343
344 /*
345 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
346 */
347 static int sdio_enable_hs(struct mmc_card *card)
348 {
349 int ret;
350
351 ret = mmc_sdio_switch_hs(card, true);
352 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
353 return ret;
354
355 ret = mmc_sd_switch_hs(card);
356 if (ret <= 0)
357 mmc_sdio_switch_hs(card, false);
358
359 return ret;
360 }
361
362 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
363 {
364 unsigned max_dtr;
365
366 if (mmc_card_highspeed(card)) {
367 /*
368 * The SDIO specification doesn't mention how
369 * the CIS transfer speed register relates to
370 * high-speed, but it seems that 50 MHz is
371 * mandatory.
372 */
373 max_dtr = 50000000;
374 } else {
375 max_dtr = card->cis.max_dtr;
376 }
377
378 if (card->type == MMC_TYPE_SD_COMBO)
379 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
380
381 return max_dtr;
382 }
383
384 static unsigned char host_drive_to_sdio_drive(int host_strength)
385 {
386 switch (host_strength) {
387 case MMC_SET_DRIVER_TYPE_A:
388 return SDIO_DTSx_SET_TYPE_A;
389 case MMC_SET_DRIVER_TYPE_B:
390 return SDIO_DTSx_SET_TYPE_B;
391 case MMC_SET_DRIVER_TYPE_C:
392 return SDIO_DTSx_SET_TYPE_C;
393 case MMC_SET_DRIVER_TYPE_D:
394 return SDIO_DTSx_SET_TYPE_D;
395 default:
396 return SDIO_DTSx_SET_TYPE_B;
397 }
398 }
399
400 static void sdio_select_driver_type(struct mmc_card *card)
401 {
402 int host_drv_type = SD_DRIVER_TYPE_B;
403 int card_drv_type = SD_DRIVER_TYPE_B;
404 int drive_strength;
405 unsigned char card_strength;
406 int err;
407
408 /*
409 * If the host doesn't support any of the Driver Types A,C or D,
410 * or there is no board specific handler then default Driver
411 * Type B is used.
412 */
413 if (!(card->host->caps &
414 (MMC_CAP_DRIVER_TYPE_A |
415 MMC_CAP_DRIVER_TYPE_C |
416 MMC_CAP_DRIVER_TYPE_D)))
417 return;
418
419 if (!card->host->ops->select_drive_strength)
420 return;
421
422 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
423 host_drv_type |= SD_DRIVER_TYPE_A;
424
425 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
426 host_drv_type |= SD_DRIVER_TYPE_C;
427
428 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
429 host_drv_type |= SD_DRIVER_TYPE_D;
430
431 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
432 card_drv_type |= SD_DRIVER_TYPE_A;
433
434 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
435 card_drv_type |= SD_DRIVER_TYPE_C;
436
437 if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
438 card_drv_type |= SD_DRIVER_TYPE_D;
439
440 /*
441 * The drive strength that the hardware can support
442 * depends on the board design. Pass the appropriate
443 * information and let the hardware specific code
444 * return what is possible given the options
445 */
446 drive_strength = card->host->ops->select_drive_strength(
447 card->sw_caps.uhs_max_dtr,
448 host_drv_type, card_drv_type);
449
450 /* if error just use default for drive strength B */
451 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
452 &card_strength);
453 if (err)
454 return;
455
456 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
457 card_strength |= host_drive_to_sdio_drive(drive_strength);
458
459 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
460 card_strength, NULL);
461
462 /* if error default to drive strength B */
463 if (!err)
464 mmc_set_driver_type(card->host, drive_strength);
465 }
466
467
468 static int sdio_set_bus_speed_mode(struct mmc_card *card)
469 {
470 unsigned int bus_speed, timing;
471 int err;
472 unsigned char speed;
473
474 /*
475 * If the host doesn't support any of the UHS-I modes, fallback on
476 * default speed.
477 */
478 if (!mmc_host_uhs(card->host))
479 return 0;
480
481 bus_speed = SDIO_SPEED_SDR12;
482 timing = MMC_TIMING_UHS_SDR12;
483 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
484 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
485 bus_speed = SDIO_SPEED_SDR104;
486 timing = MMC_TIMING_UHS_SDR104;
487 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
488 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
489 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
490 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
491 bus_speed = SDIO_SPEED_DDR50;
492 timing = MMC_TIMING_UHS_DDR50;
493 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
494 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
495 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
496 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
497 SD_MODE_UHS_SDR50)) {
498 bus_speed = SDIO_SPEED_SDR50;
499 timing = MMC_TIMING_UHS_SDR50;
500 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
501 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
502 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
503 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
504 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
505 bus_speed = SDIO_SPEED_SDR25;
506 timing = MMC_TIMING_UHS_SDR25;
507 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
508 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
509 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
510 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
511 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
512 SD_MODE_UHS_SDR12)) {
513 bus_speed = SDIO_SPEED_SDR12;
514 timing = MMC_TIMING_UHS_SDR12;
515 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
517 }
518
519 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
520 if (err)
521 return err;
522
523 speed &= ~SDIO_SPEED_BSS_MASK;
524 speed |= bus_speed;
525 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
526 if (err)
527 return err;
528
529 if (bus_speed) {
530 mmc_set_timing(card->host, timing);
531 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
532 }
533
534 return 0;
535 }
536
537 /*
538 * UHS-I specific initialization procedure
539 */
540 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
541 {
542 int err;
543
544 if (!card->scr.sda_spec3)
545 return 0;
546
547 /*
548 * Switch to wider bus (if supported).
549 */
550 if (card->host->caps & MMC_CAP_4_BIT_DATA) {
551 err = sdio_enable_4bit_bus(card);
552 if (err > 0) {
553 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
554 err = 0;
555 }
556 }
557
558 /* Set the driver strength for the card */
559 sdio_select_driver_type(card);
560
561 /* Set bus speed mode of the card */
562 err = sdio_set_bus_speed_mode(card);
563 if (err)
564 goto out;
565
566 /*
567 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
568 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
569 */
570 if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning &&
571 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
572 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104))) {
573 mmc_host_clk_hold(card->host);
574 err = card->host->ops->execute_tuning(card->host,
575 MMC_SEND_TUNING_BLOCK);
576 mmc_host_clk_release(card->host);
577 }
578
579 out:
580
581 return err;
582 }
583
584 /*
585 * Handle the detection and initialisation of a card.
586 *
587 * In the case of a resume, "oldcard" will contain the card
588 * we're trying to reinitialise.
589 */
590 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
591 struct mmc_card *oldcard, int powered_resume)
592 {
593 struct mmc_card *card;
594 int err;
595 int retries = 10;
596
597 BUG_ON(!host);
598 WARN_ON(!host->claimed);
599
600 try_again:
601 if (!retries) {
602 pr_warning("%s: Skipping voltage switch\n",
603 mmc_hostname(host));
604 ocr &= ~R4_18V_PRESENT;
605 host->ocr &= ~R4_18V_PRESENT;
606 }
607
608 /*
609 * Inform the card of the voltage
610 */
611 if (!powered_resume) {
612 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
613 if (err)
614 goto err;
615 }
616
617 /*
618 * For SPI, enable CRC as appropriate.
619 */
620 if (mmc_host_is_spi(host)) {
621 err = mmc_spi_set_crc(host, use_spi_crc);
622 if (err)
623 goto err;
624 }
625
626 /*
627 * Allocate card structure.
628 */
629 card = mmc_alloc_card(host, NULL);
630 if (IS_ERR(card)) {
631 err = PTR_ERR(card);
632 goto err;
633 }
634
635 if ((ocr & R4_MEMORY_PRESENT) &&
636 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
637 card->type = MMC_TYPE_SD_COMBO;
638
639 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
640 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
641 mmc_remove_card(card);
642 return -ENOENT;
643 }
644 } else {
645 card->type = MMC_TYPE_SDIO;
646
647 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
648 mmc_remove_card(card);
649 return -ENOENT;
650 }
651 }
652
653 /*
654 * Call the optional HC's init_card function to handle quirks.
655 */
656 if (host->ops->init_card)
657 host->ops->init_card(host, card);
658
659 /*
660 * If the host and card support UHS-I mode request the card
661 * to switch to 1.8V signaling level. No 1.8v signalling if
662 * UHS mode is not enabled to maintain compatibility and some
663 * systems that claim 1.8v signalling in fact do not support
664 * it.
665 */
666 if (!powered_resume && (ocr & R4_18V_PRESENT) && mmc_host_uhs(host)) {
667 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);
668 if (err == -EAGAIN) {
669 sdio_reset(host);
670 mmc_go_idle(host);
671 mmc_send_if_cond(host, host->ocr_avail);
672 mmc_remove_card(card);
673 retries--;
674 goto try_again;
675 } else if (err) {
676 ocr &= ~R4_18V_PRESENT;
677 host->ocr &= ~R4_18V_PRESENT;
678 }
679 err = 0;
680 } else {
681 ocr &= ~R4_18V_PRESENT;
682 host->ocr &= ~R4_18V_PRESENT;
683 }
684
685 /*
686 * For native busses: set card RCA and quit open drain mode.
687 */
688 if (!powered_resume && !mmc_host_is_spi(host)) {
689 err = mmc_send_relative_addr(host, &card->rca);
690 if (err)
691 goto remove;
692
693 /*
694 * Update oldcard with the new RCA received from the SDIO
695 * device -- we're doing this so that it's updated in the
696 * "card" struct when oldcard overwrites that later.
697 */
698 if (oldcard)
699 oldcard->rca = card->rca;
700 }
701
702 /*
703 * Read CSD, before selecting the card
704 */
705 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
706 err = mmc_sd_get_csd(host, card);
707 if (err)
708 return err;
709
710 mmc_decode_cid(card);
711 }
712
713 /*
714 * Select card, as all following commands rely on that.
715 */
716 if (!powered_resume && !mmc_host_is_spi(host)) {
717 err = mmc_select_card(card);
718 if (err)
719 goto remove;
720 }
721
722 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
723 /*
724 * This is non-standard SDIO device, meaning it doesn't
725 * have any CIA (Common I/O area) registers present.
726 * It's host's responsibility to fill cccr and cis
727 * structures in init_card().
728 */
729 mmc_set_clock(host, card->cis.max_dtr);
730
731 if (card->cccr.high_speed) {
732 mmc_card_set_highspeed(card);
733 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
734 }
735
736 goto finish;
737 }
738
739 /*
740 * Read the common registers.
741 */
742 err = sdio_read_cccr(card, ocr);
743 if (err)
744 goto remove;
745
746 /*
747 * Read the common CIS tuples.
748 */
749 err = sdio_read_common_cis(card);
750 if (err)
751 goto remove;
752
753 if (oldcard) {
754 int same = (card->cis.vendor == oldcard->cis.vendor &&
755 card->cis.device == oldcard->cis.device);
756 mmc_remove_card(card);
757 if (!same)
758 return -ENOENT;
759
760 card = oldcard;
761 }
762 mmc_fixup_device(card, NULL);
763
764 if (card->type == MMC_TYPE_SD_COMBO) {
765 err = mmc_sd_setup_card(host, card, oldcard != NULL);
766 /* handle as SDIO-only card if memory init failed */
767 if (err) {
768 mmc_go_idle(host);
769 if (mmc_host_is_spi(host))
770 /* should not fail, as it worked previously */
771 mmc_spi_set_crc(host, use_spi_crc);
772 card->type = MMC_TYPE_SDIO;
773 } else
774 card->dev.type = &sd_type;
775 }
776
777 /*
778 * If needed, disconnect card detection pull-up resistor.
779 */
780 err = sdio_disable_cd(card);
781 if (err)
782 goto remove;
783
784 /* Initialization sequence for UHS-I cards */
785 /* Only if card supports 1.8v and UHS signaling */
786 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
787 err = mmc_sdio_init_uhs_card(card);
788 if (err)
789 goto remove;
790
791 /* Card is an ultra-high-speed card */
792 mmc_card_set_uhs(card);
793 } else {
794 /*
795 * Switch to high-speed (if supported).
796 */
797 err = sdio_enable_hs(card);
798 if (err > 0)
799 mmc_sd_go_highspeed(card);
800 else if (err)
801 goto remove;
802
803 /*
804 * Change to the card's maximum speed.
805 */
806 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
807
808 /*
809 * Switch to wider bus (if supported).
810 */
811 err = sdio_enable_4bit_bus(card);
812 if (err > 0)
813 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
814 else if (err)
815 goto remove;
816 }
817 finish:
818 if (!oldcard)
819 host->card = card;
820 return 0;
821
822 remove:
823 if (!oldcard)
824 mmc_remove_card(card);
825
826 err:
827 return err;
828 }
829
830 /*
831 * Host is being removed. Free up the current card.
832 */
833 static void mmc_sdio_remove(struct mmc_host *host)
834 {
835 int i;
836
837 BUG_ON(!host);
838 BUG_ON(!host->card);
839
840 for (i = 0;i < host->card->sdio_funcs;i++) {
841 if (host->card->sdio_func[i]) {
842 sdio_remove_func(host->card->sdio_func[i]);
843 host->card->sdio_func[i] = NULL;
844 }
845 }
846
847 mmc_remove_card(host->card);
848 host->card = NULL;
849 }
850
851 /*
852 * Card detection - card is alive.
853 */
854 static int mmc_sdio_alive(struct mmc_host *host)
855 {
856 return mmc_select_card(host->card);
857 }
858
859 /*
860 * Card detection callback from host.
861 */
862 static void mmc_sdio_detect(struct mmc_host *host)
863 {
864 int err;
865
866 BUG_ON(!host);
867 BUG_ON(!host->card);
868
869 /* Make sure card is powered before detecting it */
870 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
871 err = pm_runtime_get_sync(&host->card->dev);
872 if (err < 0) {
873 pm_runtime_put_noidle(&host->card->dev);
874 goto out;
875 }
876 }
877
878 mmc_claim_host(host);
879
880 /*
881 * Just check if our card has been removed.
882 */
883 err = _mmc_detect_card_removed(host);
884
885 mmc_release_host(host);
886
887 /*
888 * Tell PM core it's OK to power off the card now.
889 *
890 * The _sync variant is used in order to ensure that the card
891 * is left powered off in case an error occurred, and the card
892 * is going to be removed.
893 *
894 * Since there is no specific reason to believe a new user
895 * is about to show up at this point, the _sync variant is
896 * desirable anyway.
897 */
898 if (host->caps & MMC_CAP_POWER_OFF_CARD)
899 pm_runtime_put_sync(&host->card->dev);
900
901 out:
902 if (err) {
903 mmc_sdio_remove(host);
904
905 mmc_claim_host(host);
906 mmc_detach_bus(host);
907 mmc_power_off(host);
908 mmc_release_host(host);
909 }
910 }
911
912 /*
913 * SDIO pre_suspend. We need to suspend all functions separately.
914 * Therefore all registered functions must have drivers with suspend
915 * and resume methods. Failing that we simply remove the whole card.
916 */
917 static int mmc_sdio_pre_suspend(struct mmc_host *host)
918 {
919 int i, err = 0;
920
921 for (i = 0; i < host->card->sdio_funcs; i++) {
922 struct sdio_func *func = host->card->sdio_func[i];
923 if (func && sdio_func_present(func) && func->dev.driver) {
924 const struct dev_pm_ops *pmops = func->dev.driver->pm;
925 if (!pmops || !pmops->suspend || !pmops->resume) {
926 /* force removal of entire card in that case */
927 err = -ENOSYS;
928 break;
929 }
930 }
931 }
932
933 return err;
934 }
935
936 /*
937 * SDIO suspend. Suspend all functions separately.
938 */
939 static int mmc_sdio_suspend(struct mmc_host *host)
940 {
941 int i, err = 0;
942
943 for (i = 0; i < host->card->sdio_funcs; i++) {
944 struct sdio_func *func = host->card->sdio_func[i];
945 if (func && sdio_func_present(func) && func->dev.driver) {
946 const struct dev_pm_ops *pmops = func->dev.driver->pm;
947 err = pmops->suspend(&func->dev);
948 if (err)
949 break;
950 }
951 }
952 while (err && --i >= 0) {
953 struct sdio_func *func = host->card->sdio_func[i];
954 if (func && sdio_func_present(func) && func->dev.driver) {
955 const struct dev_pm_ops *pmops = func->dev.driver->pm;
956 pmops->resume(&func->dev);
957 }
958 }
959
960 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
961 mmc_claim_host(host);
962 sdio_disable_wide(host->card);
963 mmc_release_host(host);
964 }
965
966 if (!err && !mmc_card_keep_power(host))
967 mmc_power_off(host);
968
969 return err;
970 }
971
972 static int mmc_sdio_resume(struct mmc_host *host)
973 {
974 int i, err = 0;
975
976 BUG_ON(!host);
977 BUG_ON(!host->card);
978
979 /* Basic card reinitialization. */
980 mmc_claim_host(host);
981
982 /* Restore power if needed */
983 if (!mmc_card_keep_power(host)) {
984 mmc_power_up(host);
985 mmc_select_voltage(host, host->ocr);
986 /*
987 * Tell runtime PM core we just powered up the card,
988 * since it still believes the card is powered off.
989 * Note that currently runtime PM is only enabled
990 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
991 */
992 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
993 pm_runtime_disable(&host->card->dev);
994 pm_runtime_set_active(&host->card->dev);
995 pm_runtime_enable(&host->card->dev);
996 }
997 }
998
999 /* No need to reinitialize powered-resumed nonremovable cards */
1000 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
1001 sdio_reset(host);
1002 mmc_go_idle(host);
1003 err = mmc_sdio_init_card(host, host->ocr, host->card,
1004 mmc_card_keep_power(host));
1005 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
1006 /* We may have switched to 1-bit mode during suspend */
1007 err = sdio_enable_4bit_bus(host->card);
1008 if (err > 0) {
1009 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
1010 err = 0;
1011 }
1012 }
1013
1014 if (!err && host->sdio_irqs)
1015 wake_up_process(host->sdio_irq_thread);
1016 mmc_release_host(host);
1017
1018 /*
1019 * If the card looked to be the same as before suspending, then
1020 * we proceed to resume all card functions. If one of them returns
1021 * an error then we simply return that error to the core and the
1022 * card will be redetected as new. It is the responsibility of
1023 * the function driver to perform further tests with the extra
1024 * knowledge it has of the card to confirm the card is indeed the
1025 * same as before suspending (same MAC address for network cards,
1026 * etc.) and return an error otherwise.
1027 */
1028 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
1029 struct sdio_func *func = host->card->sdio_func[i];
1030 if (func && sdio_func_present(func) && func->dev.driver) {
1031 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1032 err = pmops->resume(&func->dev);
1033 }
1034 }
1035
1036 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1037 return err;
1038 }
1039
1040 static int mmc_sdio_power_restore(struct mmc_host *host)
1041 {
1042 int ret;
1043 u32 ocr;
1044
1045 BUG_ON(!host);
1046 BUG_ON(!host->card);
1047
1048 mmc_claim_host(host);
1049
1050 /*
1051 * Reset the card by performing the same steps that are taken by
1052 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1053 *
1054 * sdio_reset() is technically not needed. Having just powered up the
1055 * hardware, it should already be in reset state. However, some
1056 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1057 * meaning that a reset is required when restoring power soon after
1058 * powering off. It is harmless in other cases.
1059 *
1060 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1061 * is not necessary for non-removable cards. However, it is required
1062 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1063 * harmless in other situations.
1064 *
1065 * With these steps taken, mmc_select_voltage() is also required to
1066 * restore the correct voltage setting of the card.
1067 */
1068
1069 sdio_reset(host);
1070 mmc_go_idle(host);
1071 mmc_send_if_cond(host, host->ocr_avail);
1072
1073 ret = mmc_send_io_op_cond(host, 0, &ocr);
1074 if (ret)
1075 goto out;
1076
1077 if (host->ocr_avail_sdio)
1078 host->ocr_avail = host->ocr_avail_sdio;
1079
1080 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1081 if (!host->ocr) {
1082 ret = -EINVAL;
1083 goto out;
1084 }
1085
1086 if (mmc_host_uhs(host))
1087 /* to query card if 1.8V signalling is supported */
1088 host->ocr |= R4_18V_PRESENT;
1089
1090 ret = mmc_sdio_init_card(host, host->ocr, host->card,
1091 mmc_card_keep_power(host));
1092 if (!ret && host->sdio_irqs)
1093 mmc_signal_sdio_irq(host);
1094
1095 out:
1096 mmc_release_host(host);
1097
1098 return ret;
1099 }
1100
1101 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1102 {
1103 /* No references to the card, cut the power to it. */
1104 mmc_power_off(host);
1105 return 0;
1106 }
1107
1108 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1109 {
1110 /* Restore power and re-initialize. */
1111 mmc_power_up(host);
1112 return mmc_sdio_power_restore(host);
1113 }
1114
1115 static const struct mmc_bus_ops mmc_sdio_ops = {
1116 .remove = mmc_sdio_remove,
1117 .detect = mmc_sdio_detect,
1118 .pre_suspend = mmc_sdio_pre_suspend,
1119 .suspend = mmc_sdio_suspend,
1120 .resume = mmc_sdio_resume,
1121 .runtime_suspend = mmc_sdio_runtime_suspend,
1122 .runtime_resume = mmc_sdio_runtime_resume,
1123 .power_restore = mmc_sdio_power_restore,
1124 .alive = mmc_sdio_alive,
1125 };
1126
1127
1128 /*
1129 * Starting point for SDIO card init.
1130 */
1131 int mmc_attach_sdio(struct mmc_host *host)
1132 {
1133 int err, i, funcs;
1134 u32 ocr;
1135 struct mmc_card *card;
1136
1137 BUG_ON(!host);
1138 WARN_ON(!host->claimed);
1139
1140 err = mmc_send_io_op_cond(host, 0, &ocr);
1141 if (err)
1142 return err;
1143
1144 mmc_attach_bus(host, &mmc_sdio_ops);
1145 if (host->ocr_avail_sdio)
1146 host->ocr_avail = host->ocr_avail_sdio;
1147
1148 /*
1149 * Sanity check the voltages that the card claims to
1150 * support.
1151 */
1152 if (ocr & 0x7F) {
1153 pr_warning("%s: card claims to support voltages "
1154 "below the defined range. These will be ignored.\n",
1155 mmc_hostname(host));
1156 ocr &= ~0x7F;
1157 }
1158
1159 host->ocr = mmc_select_voltage(host, ocr);
1160
1161 /*
1162 * Can we support the voltage(s) of the card(s)?
1163 */
1164 if (!host->ocr) {
1165 err = -EINVAL;
1166 goto err;
1167 }
1168
1169 /*
1170 * Detect and init the card.
1171 */
1172 if (mmc_host_uhs(host))
1173 /* to query card if 1.8V signalling is supported */
1174 host->ocr |= R4_18V_PRESENT;
1175
1176 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1177 if (err) {
1178 if (err == -EAGAIN) {
1179 /*
1180 * Retry initialization with S18R set to 0.
1181 */
1182 host->ocr &= ~R4_18V_PRESENT;
1183 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1184 }
1185 if (err)
1186 goto err;
1187 }
1188 card = host->card;
1189
1190 /*
1191 * Enable runtime PM only if supported by host+card+board
1192 */
1193 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1194 /*
1195 * Let runtime PM core know our card is active
1196 */
1197 err = pm_runtime_set_active(&card->dev);
1198 if (err)
1199 goto remove;
1200
1201 /*
1202 * Enable runtime PM for this card
1203 */
1204 pm_runtime_enable(&card->dev);
1205 }
1206
1207 /*
1208 * The number of functions on the card is encoded inside
1209 * the ocr.
1210 */
1211 funcs = (ocr & 0x70000000) >> 28;
1212 card->sdio_funcs = 0;
1213
1214 /*
1215 * Initialize (but don't add) all present functions.
1216 */
1217 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1218 err = sdio_init_func(host->card, i + 1);
1219 if (err)
1220 goto remove;
1221
1222 /*
1223 * Enable Runtime PM for this func (if supported)
1224 */
1225 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1226 pm_runtime_enable(&card->sdio_func[i]->dev);
1227 }
1228
1229 /*
1230 * First add the card to the driver model...
1231 */
1232 mmc_release_host(host);
1233 err = mmc_add_card(host->card);
1234 if (err)
1235 goto remove_added;
1236
1237 /*
1238 * ...then the SDIO functions.
1239 */
1240 for (i = 0;i < funcs;i++) {
1241 err = sdio_add_func(host->card->sdio_func[i]);
1242 if (err)
1243 goto remove_added;
1244 }
1245
1246 mmc_claim_host(host);
1247 return 0;
1248
1249
1250 remove_added:
1251 /* Remove without lock if the device has been added. */
1252 mmc_sdio_remove(host);
1253 mmc_claim_host(host);
1254 remove:
1255 /* And with lock if it hasn't been added. */
1256 mmc_release_host(host);
1257 if (host->card)
1258 mmc_sdio_remove(host);
1259 mmc_claim_host(host);
1260 err:
1261 mmc_detach_bus(host);
1262
1263 pr_err("%s: error %d whilst initialising SDIO card\n",
1264 mmc_hostname(host), err);
1265
1266 return err;
1267 }
1268
CRIS linux kernel tree