projects / deliverable / linux.git / blob
? search:


ef82f3d029e8b2da5b5c1c6b4b76fc46038dd163
[deliverable/linux.git] / drivers / mmc / core / sdio.c
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 host_drv_type = SD_DRIVER_TYPE_B;
406 int card_drv_type, drive_strength, drv_type;
407 unsigned char card_strength;
408 int err;
409
410 if (!card->host->ops->select_drive_strength)
411 return;
412
413 if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
414 host_drv_type |= SD_DRIVER_TYPE_A;
415
416 if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
417 host_drv_type |= SD_DRIVER_TYPE_C;
418
419 if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
420 host_drv_type |= SD_DRIVER_TYPE_D;
421
422 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
423
424 /*
425 * The drive strength that the hardware can support
426 * depends on the board design. Pass the appropriate
427 * information and let the hardware specific code
428 * return what is possible given the options
429 */
430 drive_strength = card->host->ops->select_drive_strength(
431 card->sw_caps.uhs_max_dtr,
432 host_drv_type, card_drv_type, &drv_type);
433
434 if (drive_strength) {
435 /* if error just use default for drive strength B */
436 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
437 &card_strength);
438 if (err)
439 return;
440
441 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
442 card_strength |= host_drive_to_sdio_drive(drive_strength);
443
444 /* if error default to drive strength B */
445 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
446 card_strength, NULL);
447 if (err)
448 return;
449 }
450
451 if (drv_type)
452 mmc_set_driver_type(card->host, drv_type);
453 }
454
455
456 static int sdio_set_bus_speed_mode(struct mmc_card *card)
457 {
458 unsigned int bus_speed, timing;
459 int err;
460 unsigned char speed;
461
462 /*
463 * If the host doesn't support any of the UHS-I modes, fallback on
464 * default speed.
465 */
466 if (!mmc_host_uhs(card->host))
467 return 0;
468
469 bus_speed = SDIO_SPEED_SDR12;
470 timing = MMC_TIMING_UHS_SDR12;
471 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
472 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
473 bus_speed = SDIO_SPEED_SDR104;
474 timing = MMC_TIMING_UHS_SDR104;
475 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
476 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
477 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
478 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
479 bus_speed = SDIO_SPEED_DDR50;
480 timing = MMC_TIMING_UHS_DDR50;
481 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
482 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
483 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
484 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
485 SD_MODE_UHS_SDR50)) {
486 bus_speed = SDIO_SPEED_SDR50;
487 timing = MMC_TIMING_UHS_SDR50;
488 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
489 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
490 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
491 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
492 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
493 bus_speed = SDIO_SPEED_SDR25;
494 timing = MMC_TIMING_UHS_SDR25;
495 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
496 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
497 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
499 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
500 SD_MODE_UHS_SDR12)) {
501 bus_speed = SDIO_SPEED_SDR12;
502 timing = MMC_TIMING_UHS_SDR12;
503 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
504 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
505 }
506
507 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
508 if (err)
509 return err;
510
511 speed &= ~SDIO_SPEED_BSS_MASK;
512 speed |= bus_speed;
513 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
514 if (err)
515 return err;
516
517 if (bus_speed) {
518 mmc_set_timing(card->host, timing);
519 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
520 }
521
522 return 0;
523 }
524
525 /*
526 * UHS-I specific initialization procedure
527 */
528 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
529 {
530 int err;
531
532 if (!card->scr.sda_spec3)
533 return 0;
534
535 /*
536 * Switch to wider bus (if supported).
537 */
538 if (card->host->caps & MMC_CAP_4_BIT_DATA)
539 err = sdio_enable_4bit_bus(card);
540
541 /* Set the driver strength for the card */
542 sdio_select_driver_type(card);
543
544 /* Set bus speed mode of the card */
545 err = sdio_set_bus_speed_mode(card);
546 if (err)
547 goto out;
548
549 /*
550 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
551 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
552 */
553 if (!mmc_host_is_spi(card->host) &&
554 ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
555 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)))
556 err = mmc_execute_tuning(card);
557 out:
558 return err;
559 }
560
561 /*
562 * Handle the detection and initialisation of a card.
563 *
564 * In the case of a resume, "oldcard" will contain the card
565 * we're trying to reinitialise.
566 */
567 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
568 struct mmc_card *oldcard, int powered_resume)
569 {
570 struct mmc_card *card;
571 int err;
572 int retries = 10;
573 u32 rocr = 0;
574 u32 ocr_card = ocr;
575
576 BUG_ON(!host);
577 WARN_ON(!host->claimed);
578
579 /* to query card if 1.8V signalling is supported */
580 if (mmc_host_uhs(host))
581 ocr |= R4_18V_PRESENT;
582
583 try_again:
584 if (!retries) {
585 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
586 ocr &= ~R4_18V_PRESENT;
587 }
588
589 /*
590 * Inform the card of the voltage
591 */
592 if (!powered_resume) {
593 err = mmc_send_io_op_cond(host, ocr, &rocr);
594 if (err)
595 goto err;
596 }
597
598 /*
599 * For SPI, enable CRC as appropriate.
600 */
601 if (mmc_host_is_spi(host)) {
602 err = mmc_spi_set_crc(host, use_spi_crc);
603 if (err)
604 goto err;
605 }
606
607 /*
608 * Allocate card structure.
609 */
610 card = mmc_alloc_card(host, NULL);
611 if (IS_ERR(card)) {
612 err = PTR_ERR(card);
613 goto err;
614 }
615
616 if ((rocr & R4_MEMORY_PRESENT) &&
617 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
618 card->type = MMC_TYPE_SD_COMBO;
619
620 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
621 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
622 mmc_remove_card(card);
623 return -ENOENT;
624 }
625 } else {
626 card->type = MMC_TYPE_SDIO;
627
628 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
629 mmc_remove_card(card);
630 return -ENOENT;
631 }
632 }
633
634 /*
635 * Call the optional HC's init_card function to handle quirks.
636 */
637 if (host->ops->init_card)
638 host->ops->init_card(host, card);
639
640 /*
641 * If the host and card support UHS-I mode request the card
642 * to switch to 1.8V signaling level. No 1.8v signalling if
643 * UHS mode is not enabled to maintain compatibility and some
644 * systems that claim 1.8v signalling in fact do not support
645 * it.
646 */
647 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
648 err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
649 ocr);
650 if (err == -EAGAIN) {
651 sdio_reset(host);
652 mmc_go_idle(host);
653 mmc_send_if_cond(host, host->ocr_avail);
654 mmc_remove_card(card);
655 retries--;
656 goto try_again;
657 } else if (err) {
658 ocr &= ~R4_18V_PRESENT;
659 }
660 err = 0;
661 } else {
662 ocr &= ~R4_18V_PRESENT;
663 }
664
665 /*
666 * For native busses: set card RCA and quit open drain mode.
667 */
668 if (!powered_resume && !mmc_host_is_spi(host)) {
669 err = mmc_send_relative_addr(host, &card->rca);
670 if (err)
671 goto remove;
672
673 /*
674 * Update oldcard with the new RCA received from the SDIO
675 * device -- we're doing this so that it's updated in the
676 * "card" struct when oldcard overwrites that later.
677 */
678 if (oldcard)
679 oldcard->rca = card->rca;
680 }
681
682 /*
683 * Read CSD, before selecting the card
684 */
685 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
686 err = mmc_sd_get_csd(host, card);
687 if (err)
688 return err;
689
690 mmc_decode_cid(card);
691 }
692
693 /*
694 * Select card, as all following commands rely on that.
695 */
696 if (!powered_resume && !mmc_host_is_spi(host)) {
697 err = mmc_select_card(card);
698 if (err)
699 goto remove;
700 }
701
702 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
703 /*
704 * This is non-standard SDIO device, meaning it doesn't
705 * have any CIA (Common I/O area) registers present.
706 * It's host's responsibility to fill cccr and cis
707 * structures in init_card().
708 */
709 mmc_set_clock(host, card->cis.max_dtr);
710
711 if (card->cccr.high_speed) {
712 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
713 }
714
715 goto finish;
716 }
717
718 /*
719 * Read the common registers.
720 */
721 err = sdio_read_cccr(card, ocr);
722 if (err)
723 goto remove;
724
725 /*
726 * Read the common CIS tuples.
727 */
728 err = sdio_read_common_cis(card);
729 if (err)
730 goto remove;
731
732 if (oldcard) {
733 int same = (card->cis.vendor == oldcard->cis.vendor &&
734 card->cis.device == oldcard->cis.device);
735 mmc_remove_card(card);
736 if (!same)
737 return -ENOENT;
738
739 card = oldcard;
740 }
741 card->ocr = ocr_card;
742 mmc_fixup_device(card, NULL);
743
744 if (card->type == MMC_TYPE_SD_COMBO) {
745 err = mmc_sd_setup_card(host, card, oldcard != NULL);
746 /* handle as SDIO-only card if memory init failed */
747 if (err) {
748 mmc_go_idle(host);
749 if (mmc_host_is_spi(host))
750 /* should not fail, as it worked previously */
751 mmc_spi_set_crc(host, use_spi_crc);
752 card->type = MMC_TYPE_SDIO;
753 } else
754 card->dev.type = &sd_type;
755 }
756
757 /*
758 * If needed, disconnect card detection pull-up resistor.
759 */
760 err = sdio_disable_cd(card);
761 if (err)
762 goto remove;
763
764 /* Initialization sequence for UHS-I cards */
765 /* Only if card supports 1.8v and UHS signaling */
766 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
767 err = mmc_sdio_init_uhs_card(card);
768 if (err)
769 goto remove;
770 } else {
771 /*
772 * Switch to high-speed (if supported).
773 */
774 err = sdio_enable_hs(card);
775 if (err > 0)
776 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
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)
790 goto remove;
791 }
792 finish:
793 if (!oldcard)
794 host->card = card;
795 return 0;
796
797 remove:
798 if (!oldcard)
799 mmc_remove_card(card);
800
801 err:
802 return err;
803 }
804
805 /*
806 * Host is being removed. Free up the current card.
807 */
808 static void mmc_sdio_remove(struct mmc_host *host)
809 {
810 int i;
811
812 BUG_ON(!host);
813 BUG_ON(!host->card);
814
815 for (i = 0;i < host->card->sdio_funcs;i++) {
816 if (host->card->sdio_func[i]) {
817 sdio_remove_func(host->card->sdio_func[i]);
818 host->card->sdio_func[i] = NULL;
819 }
820 }
821
822 mmc_remove_card(host->card);
823 host->card = NULL;
824 }
825
826 /*
827 * Card detection - card is alive.
828 */
829 static int mmc_sdio_alive(struct mmc_host *host)
830 {
831 return mmc_select_card(host->card);
832 }
833
834 /*
835 * Card detection callback from host.
836 */
837 static void mmc_sdio_detect(struct mmc_host *host)
838 {
839 int err;
840
841 BUG_ON(!host);
842 BUG_ON(!host->card);
843
844 /* Make sure card is powered before detecting it */
845 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
846 err = pm_runtime_get_sync(&host->card->dev);
847 if (err < 0) {
848 pm_runtime_put_noidle(&host->card->dev);
849 goto out;
850 }
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 pre_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_pre_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 break;
904 }
905 }
906 }
907
908 return err;
909 }
910
911 /*
912 * SDIO suspend. Suspend all functions separately.
913 */
914 static int mmc_sdio_suspend(struct mmc_host *host)
915 {
916 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
917 mmc_claim_host(host);
918 sdio_disable_wide(host->card);
919 mmc_release_host(host);
920 }
921
922 if (!mmc_card_keep_power(host)) {
923 mmc_power_off(host);
924 } else if (host->retune_period) {
925 mmc_retune_timer_stop(host);
926 mmc_retune_needed(host);
927 }
928
929 return 0;
930 }
931
932 static int mmc_sdio_resume(struct mmc_host *host)
933 {
934 int err = 0;
935
936 BUG_ON(!host);
937 BUG_ON(!host->card);
938
939 /* Basic card reinitialization. */
940 mmc_claim_host(host);
941
942 /* Restore power if needed */
943 if (!mmc_card_keep_power(host)) {
944 mmc_power_up(host, host->card->ocr);
945 /*
946 * Tell runtime PM core we just powered up the card,
947 * since it still believes the card is powered off.
948 * Note that currently runtime PM is only enabled
949 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
950 */
951 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
952 pm_runtime_disable(&host->card->dev);
953 pm_runtime_set_active(&host->card->dev);
954 pm_runtime_enable(&host->card->dev);
955 }
956 }
957
958 /* No need to reinitialize powered-resumed nonremovable cards */
959 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
960 sdio_reset(host);
961 mmc_go_idle(host);
962 mmc_send_if_cond(host, host->card->ocr);
963 err = mmc_send_io_op_cond(host, 0, NULL);
964 if (!err)
965 err = mmc_sdio_init_card(host, host->card->ocr,
966 host->card,
967 mmc_card_keep_power(host));
968 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
969 /* We may have switched to 1-bit mode during suspend */
970 err = sdio_enable_4bit_bus(host->card);
971 }
972
973 if (!err && host->sdio_irqs) {
974 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
975 wake_up_process(host->sdio_irq_thread);
976 } else if (host->caps & MMC_CAP_SDIO_IRQ) {
977 mmc_host_clk_hold(host);
978 host->ops->enable_sdio_irq(host, 1);
979 mmc_host_clk_release(host);
980 }
981 }
982
983 mmc_release_host(host);
984
985 host->pm_flags &= ~MMC_PM_KEEP_POWER;
986 return err;
987 }
988
989 static int mmc_sdio_power_restore(struct mmc_host *host)
990 {
991 int ret;
992
993 BUG_ON(!host);
994 BUG_ON(!host->card);
995
996 mmc_claim_host(host);
997
998 /*
999 * Reset the card by performing the same steps that are taken by
1000 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1001 *
1002 * sdio_reset() is technically not needed. Having just powered up the
1003 * hardware, it should already be in reset state. However, some
1004 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1005 * meaning that a reset is required when restoring power soon after
1006 * powering off. It is harmless in other cases.
1007 *
1008 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1009 * is not necessary for non-removable cards. However, it is required
1010 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1011 * harmless in other situations.
1012 *
1013 */
1014
1015 sdio_reset(host);
1016 mmc_go_idle(host);
1017 mmc_send_if_cond(host, host->card->ocr);
1018
1019 ret = mmc_send_io_op_cond(host, 0, NULL);
1020 if (ret)
1021 goto out;
1022
1023 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1024 mmc_card_keep_power(host));
1025 if (!ret && host->sdio_irqs)
1026 mmc_signal_sdio_irq(host);
1027
1028 out:
1029 mmc_release_host(host);
1030
1031 return ret;
1032 }
1033
1034 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1035 {
1036 /* No references to the card, cut the power to it. */
1037 mmc_power_off(host);
1038 return 0;
1039 }
1040
1041 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1042 {
1043 /* Restore power and re-initialize. */
1044 mmc_power_up(host, host->card->ocr);
1045 return mmc_sdio_power_restore(host);
1046 }
1047
1048 static int mmc_sdio_reset(struct mmc_host *host)
1049 {
1050 mmc_power_cycle(host, host->card->ocr);
1051 return mmc_sdio_power_restore(host);
1052 }
1053
1054 static const struct mmc_bus_ops mmc_sdio_ops = {
1055 .remove = mmc_sdio_remove,
1056 .detect = mmc_sdio_detect,
1057 .pre_suspend = mmc_sdio_pre_suspend,
1058 .suspend = mmc_sdio_suspend,
1059 .resume = mmc_sdio_resume,
1060 .runtime_suspend = mmc_sdio_runtime_suspend,
1061 .runtime_resume = mmc_sdio_runtime_resume,
1062 .power_restore = mmc_sdio_power_restore,
1063 .alive = mmc_sdio_alive,
1064 .reset = mmc_sdio_reset,
1065 };
1066
1067
1068 /*
1069 * Starting point for SDIO card init.
1070 */
1071 int mmc_attach_sdio(struct mmc_host *host)
1072 {
1073 int err, i, funcs;
1074 u32 ocr, rocr;
1075 struct mmc_card *card;
1076
1077 BUG_ON(!host);
1078 WARN_ON(!host->claimed);
1079
1080 err = mmc_send_io_op_cond(host, 0, &ocr);
1081 if (err)
1082 return err;
1083
1084 mmc_attach_bus(host, &mmc_sdio_ops);
1085 if (host->ocr_avail_sdio)
1086 host->ocr_avail = host->ocr_avail_sdio;
1087
1088
1089 rocr = mmc_select_voltage(host, ocr);
1090
1091 /*
1092 * Can we support the voltage(s) of the card(s)?
1093 */
1094 if (!rocr) {
1095 err = -EINVAL;
1096 goto err;
1097 }
1098
1099 /*
1100 * Detect and init the card.
1101 */
1102 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1103 if (err)
1104 goto err;
1105
1106 card = host->card;
1107
1108 /*
1109 * Enable runtime PM only if supported by host+card+board
1110 */
1111 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1112 /*
1113 * Let runtime PM core know our card is active
1114 */
1115 err = pm_runtime_set_active(&card->dev);
1116 if (err)
1117 goto remove;
1118
1119 /*
1120 * Enable runtime PM for this card
1121 */
1122 pm_runtime_enable(&card->dev);
1123 }
1124
1125 /*
1126 * The number of functions on the card is encoded inside
1127 * the ocr.
1128 */
1129 funcs = (ocr & 0x70000000) >> 28;
1130 card->sdio_funcs = 0;
1131
1132 /*
1133 * Initialize (but don't add) all present functions.
1134 */
1135 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1136 err = sdio_init_func(host->card, i + 1);
1137 if (err)
1138 goto remove;
1139
1140 /*
1141 * Enable Runtime PM for this func (if supported)
1142 */
1143 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1144 pm_runtime_enable(&card->sdio_func[i]->dev);
1145 }
1146
1147 /*
1148 * First add the card to the driver model...
1149 */
1150 mmc_release_host(host);
1151 err = mmc_add_card(host->card);
1152 if (err)
1153 goto remove_added;
1154
1155 /*
1156 * ...then the SDIO functions.
1157 */
1158 for (i = 0;i < funcs;i++) {
1159 err = sdio_add_func(host->card->sdio_func[i]);
1160 if (err)
1161 goto remove_added;
1162 }
1163
1164 mmc_claim_host(host);
1165 return 0;
1166
1167
1168 remove_added:
1169 /* Remove without lock if the device has been added. */
1170 mmc_sdio_remove(host);
1171 mmc_claim_host(host);
1172 remove:
1173 /* And with lock if it hasn't been added. */
1174 mmc_release_host(host);
1175 if (host->card)
1176 mmc_sdio_remove(host);
1177 mmc_claim_host(host);
1178 err:
1179 mmc_detach_bus(host);
1180
1181 pr_err("%s: error %d whilst initialising SDIO card\n",
1182 mmc_hostname(host), err);
1183
1184 return err;
1185 }
1186
Linux kernel - Deliverables
This page took 0.089315 seconds and 4 git commands to generate.