1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * linux/drivers/mmc/sdio.c
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or (at
10 * your option) any later version.
11 */
12
13 #include <linux/err.h>
14 #include <linux/module.h>
15 #include <linux/pm_runtime.h>
16
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.h>
20 #include <linux/mmc/sdio.h>
21 #include <linux/mmc/sdio_func.h>
22 #include <linux/mmc/sdio_ids.h>
23
24 #include "core.h"
25 #include "card.h"
26 #include "host.h"
27 #include "bus.h"
28 #include "quirks.h"
29 #include "sd.h"
30 #include "sdio_bus.h"
31 #include "mmc_ops.h"
32 #include "sd_ops.h"
33 #include "sdio_ops.h"
34 #include "sdio_cis.h"
35
36 #define SDIO_HALF_BYTE_SHIFT_MASK 4
37 #define SDIO_DWORD_SHIFT_MASK 28
38 #define SDIO_HIGH_SPEED_MAX 50000000
39 #define SDIO_NORMAL_SPEED_MAX 25000000
40
sdio_read_fbr(struct sdio_func * func)41 static int sdio_read_fbr(struct sdio_func *func)
42 {
43 int ret;
44 unsigned char data;
45
46 if (mmc_card_nonstd_func_interface(func->card)) {
47 func->class = SDIO_CLASS_NONE;
48 return 0;
49 }
50
51 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
52 if (ret) {
53 goto out;
54 }
55
56 data &= 0x0f;
57
58 if (data == 0x0f) {
59 ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
60 if (ret) {
61 goto out;
62 }
63 }
64
65 func->class = data;
66
67 out:
68 return ret;
69 }
70
sdio_init_func(struct mmc_card * card,unsigned int fn)71 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
72 {
73 int ret;
74 struct sdio_func *func;
75
76 if (WARN_ON(fn > SDIO_MAX_FUNCS)) {
77 return -EINVAL;
78 }
79
80 func = sdio_alloc_func(card);
81 if (IS_ERR(func)) {
82 return PTR_ERR(func);
83 }
84
85 func->num = fn;
86
87 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
88 ret = sdio_read_fbr(func);
89 if (ret) {
90 goto fail;
91 }
92
93 ret = sdio_read_func_cis(func);
94 if (ret) {
95 goto fail;
96 }
97 } else {
98 func->vendor = func->card->cis.vendor;
99 func->device = func->card->cis.device;
100 func->max_blksize = func->card->cis.blksize;
101 }
102
103 card->sdio_func[fn - 1] = func;
104
105 return 0;
106
107 fail:
108 /*
109 * It is okay to remove the function here even though we hold
110 * the host lock as we haven't registered the device yet.
111 */
112 sdio_remove_func(func);
113 return ret;
114 }
115
sdio_read_cccr(struct mmc_card * card,u32 ocr)116 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
117 {
118 int ret;
119 int cccr_vsn;
120 int uhs = ocr & R4_18V_PRESENT;
121 unsigned char data;
122 unsigned char speed;
123
124 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
125 if (ret) {
126 goto out;
127 }
128
129 cccr_vsn = data & 0x0f;
130
131 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
132 pr_err("%s: unrecognised CCCR structure version %d\n", mmc_hostname(card->host), cccr_vsn);
133 return -EINVAL;
134 }
135
136 card->cccr.sdio_vsn = (data & 0xf0) >> SDIO_HALF_BYTE_SHIFT_MASK;
137
138 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
139 if (ret) {
140 goto out;
141 }
142
143 if (data & SDIO_CCCR_CAP_SMB) {
144 card->cccr.multi_block = 1;
145 }
146 if (data & SDIO_CCCR_CAP_LSC) {
147 card->cccr.low_speed = 1;
148 }
149 if (data & SDIO_CCCR_CAP_4BLS) {
150 card->cccr.wide_bus = 1;
151 }
152
153 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
154 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
155 if (ret) {
156 goto out;
157 }
158
159 if (data & SDIO_POWER_SMPC) {
160 card->cccr.high_power = 1;
161 }
162 }
163
164 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
165 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
166 if (ret) {
167 goto out;
168 }
169
170 card->scr.sda_spec3 = 0;
171 card->sw_caps.sd3_bus_mode = 0;
172 card->sw_caps.sd3_drv_type = 0;
173 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
174 card->scr.sda_spec3 = 1;
175 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_UHS, 0, &data);
176 if (ret) {
177 goto out;
178 }
179
180 if (mmc_host_uhs(card->host)) {
181 if (data & SDIO_UHS_DDR50) {
182 card->sw_caps.sd3_bus_mode |= SD_MODE_UHS_DDR50;
183 }
184
185 if (data & SDIO_UHS_SDR50) {
186 card->sw_caps.sd3_bus_mode |= SD_MODE_UHS_SDR50;
187 }
188
189 if (data & SDIO_UHS_SDR104) {
190 card->sw_caps.sd3_bus_mode |= SD_MODE_UHS_SDR104;
191 }
192 }
193
194 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
195 if (ret) {
196 goto out;
197 }
198
199 if (data & SDIO_DRIVE_SDTA) {
200 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
201 }
202 if (data & SDIO_DRIVE_SDTC) {
203 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
204 }
205 if (data & SDIO_DRIVE_SDTD) {
206 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
207 }
208 }
209
210 /* if no uhs mode ensure we check for high speed */
211 if (!card->sw_caps.sd3_bus_mode) {
212 if (speed & SDIO_SPEED_SHS) {
213 card->cccr.high_speed = 1;
214 card->sw_caps.hs_max_dtr = SDIO_HIGH_SPEED_MAX;
215 } else {
216 card->cccr.high_speed = 0;
217 card->sw_caps.hs_max_dtr = SDIO_NORMAL_SPEED_MAX;
218 }
219 }
220 }
221
222 out:
223 return ret;
224 }
225
sdio_enable_wide(struct mmc_card * card)226 static int sdio_enable_wide(struct mmc_card *card)
227 {
228 int ret;
229 u8 ctrl;
230
231 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) {
232 return 0;
233 }
234
235 if (card->cccr.low_speed && !card->cccr.wide_bus) {
236 return 0;
237 }
238
239 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
240 if (ret) {
241 return ret;
242 }
243
244 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED) {
245 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n", mmc_hostname(card->host), ctrl);
246 }
247
248 /* set as 4-bit bus width */
249 ctrl &= ~SDIO_BUS_WIDTH_MASK;
250 ctrl |= SDIO_BUS_WIDTH_4BIT;
251
252 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
253 if (ret) {
254 return ret;
255 }
256
257 return 1;
258 }
259
260 /*
261 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
262 * of the card. This may be required on certain setups of boards,
263 * controllers and embedded sdio device which do not need the card's
264 * pull-up. As a result, card detection is disabled and power is saved.
265 */
sdio_disable_cd(struct mmc_card * card)266 static int sdio_disable_cd(struct mmc_card *card)
267 {
268 int ret;
269 u8 ctrl;
270
271 if (!mmc_card_disable_cd(card)) {
272 return 0;
273 }
274
275 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
276 if (ret) {
277 return ret;
278 }
279
280 ctrl |= SDIO_BUS_CD_DISABLE;
281
282 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
283 }
284
285 /*
286 * Devices that remain active during a system suspend are
287 * put back into 1-bit mode.
288 */
sdio_disable_wide(struct mmc_card * card)289 static int sdio_disable_wide(struct mmc_card *card)
290 {
291 int ret;
292 u8 ctrl;
293
294 if (!(card->host->caps & MMC_CAP_4_BIT_DATA)) {
295 return 0;
296 }
297
298 if (card->cccr.low_speed && !card->cccr.wide_bus) {
299 return 0;
300 }
301
302 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
303 if (ret) {
304 return ret;
305 }
306
307 if (!(ctrl & SDIO_BUS_WIDTH_4BIT)) {
308 return 0;
309 }
310
311 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
312 ctrl |= SDIO_BUS_ASYNC_INT;
313
314 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
315 if (ret) {
316 return ret;
317 }
318
319 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
320
321 return 0;
322 }
323
sdio_enable_4bit_bus(struct mmc_card * card)324 static int sdio_enable_4bit_bus(struct mmc_card *card)
325 {
326 int err;
327
328 if (card->type == MMC_TYPE_SDIO) {
329 err = sdio_enable_wide(card);
330 } else if ((card->host->caps & MMC_CAP_4_BIT_DATA) && (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
331 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
332 if (err) {
333 return err;
334 }
335 err = sdio_enable_wide(card);
336 if (err <= 0) {
337 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
338 }
339 } else {
340 return 0;
341 }
342
343 if (err > 0) {
344 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
345 err = 0;
346 }
347
348 return err;
349 }
350
351 /*
352 * Test if the card supports high-speed mode and, if so, switch to it.
353 */
mmc_sdio_switch_hs(struct mmc_card * card,int enable)354 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
355 {
356 int ret;
357 u8 speed;
358
359 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) {
360 return 0;
361 }
362
363 if (!card->cccr.high_speed) {
364 return 0;
365 }
366
367 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
368 if (ret) {
369 return ret;
370 }
371
372 if (enable) {
373 speed |= SDIO_SPEED_EHS;
374 } else {
375 speed &= ~SDIO_SPEED_EHS;
376 }
377
378 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
379 if (ret) {
380 return ret;
381 }
382
383 return 1;
384 }
385
386 /*
387 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
388 */
sdio_enable_hs(struct mmc_card * card)389 static int sdio_enable_hs(struct mmc_card *card)
390 {
391 int ret;
392
393 ret = mmc_sdio_switch_hs(card, true);
394 if (ret <= 0 || card->type == MMC_TYPE_SDIO) {
395 return ret;
396 }
397
398 ret = mmc_sd_switch_hs(card);
399 if (ret <= 0) {
400 mmc_sdio_switch_hs(card, false);
401 }
402
403 return ret;
404 }
405
mmc_sdio_get_max_clock(struct mmc_card * card)406 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
407 {
408 unsigned max_dtr;
409
410 if (mmc_card_hs(card)) {
411 /*
412 * The SDIO specification doesn't mention how
413 * the CIS transfer speed register relates to
414 * high-speed, but it seems that 50 MHz is
415 * mandatory.
416 */
417 max_dtr = SDIO_HIGH_SPEED_MAX;
418 } else {
419 max_dtr = card->cis.max_dtr;
420 }
421
422 if (card->type == MMC_TYPE_SD_COMBO) {
423 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
424 }
425
426 return max_dtr;
427 }
428
host_drive_to_sdio_drive(int host_strength)429 static unsigned char host_drive_to_sdio_drive(int host_strength)
430 {
431 switch (host_strength) {
432 case MMC_SET_DRIVER_TYPE_A:
433 return SDIO_DTSx_SET_TYPE_A;
434 case MMC_SET_DRIVER_TYPE_B:
435 return SDIO_DTSx_SET_TYPE_B;
436 case MMC_SET_DRIVER_TYPE_C:
437 return SDIO_DTSx_SET_TYPE_C;
438 case MMC_SET_DRIVER_TYPE_D:
439 return SDIO_DTSx_SET_TYPE_D;
440 default:
441 return SDIO_DTSx_SET_TYPE_B;
442 }
443 }
444
sdio_select_driver_type(struct mmc_card * card)445 static void sdio_select_driver_type(struct mmc_card *card)
446 {
447 int card_drv_type, drive_strength, drv_type;
448 unsigned char card_strength;
449 int err;
450
451 card->drive_strength = 0;
452
453 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
454
455 drive_strength = mmc_select_drive_strength(card, card->sw_caps.uhs_max_dtr, card_drv_type, &drv_type);
456 if (drive_strength) {
457 /* if error just use default for drive strength B */
458 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0, &card_strength);
459 if (err) {
460 return;
461 }
462
463 card_strength &= ~(SDIO_DRIVE_DTSx_MASK << SDIO_DRIVE_DTSx_SHIFT);
464 card_strength |= host_drive_to_sdio_drive(drive_strength);
465
466 /* if error default to drive strength B */
467 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH, card_strength, NULL);
468 if (err) {
469 return;
470 }
471 card->drive_strength = drive_strength;
472 }
473
474 if (drv_type) {
475 mmc_set_driver_type(card->host, drv_type);
476 }
477 }
478
sdio_set_bus_speed_mode(struct mmc_card * card)479 static int sdio_set_bus_speed_mode(struct mmc_card *card)
480 {
481 unsigned int bus_speed, timing;
482 int err;
483 unsigned char speed;
484 unsigned int max_rate;
485
486 /*
487 * If the host doesn't support any of the UHS-I modes, fallback on
488 * default speed.
489 */
490 if (!mmc_host_uhs(card->host)) {
491 return 0;
492 }
493
494 bus_speed = SDIO_SPEED_SDR12;
495 timing = MMC_TIMING_UHS_SDR12;
496 if ((card->host->caps & MMC_CAP_UHS_SDR104) && (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
497 bus_speed = SDIO_SPEED_SDR104;
498 timing = MMC_TIMING_UHS_SDR104;
499 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
500 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
501 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) && (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
502 bus_speed = SDIO_SPEED_DDR50;
503 timing = MMC_TIMING_UHS_DDR50;
504 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
505 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
506 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50)) &&
507 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50)) {
508 bus_speed = SDIO_SPEED_SDR50;
509 timing = MMC_TIMING_UHS_SDR50;
510 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
511 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
512 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
513 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
514 bus_speed = SDIO_SPEED_SDR25;
515 timing = MMC_TIMING_UHS_SDR25;
516 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
517 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
518 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 | MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR12)) &&
519 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR12)) {
520 bus_speed = SDIO_SPEED_SDR12;
521 timing = MMC_TIMING_UHS_SDR12;
522 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
523 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
524 }
525
526 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
527 if (err) {
528 return err;
529 }
530
531 speed &= ~SDIO_SPEED_BSS_MASK;
532 speed |= bus_speed;
533 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
534 if (err) {
535 return err;
536 }
537
538 max_rate = min_not_zero(card->quirk_max_rate, card->sw_caps.uhs_max_dtr);
539
540 if (bus_speed) {
541 mmc_set_timing(card->host, timing);
542 mmc_set_clock(card->host, max_rate);
543 }
544
545 return 0;
546 }
547
548 /*
549 * UHS-I specific initialization procedure
550 */
mmc_sdio_init_uhs_card(struct mmc_card * card)551 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
552 {
553 int err;
554
555 if (!card->scr.sda_spec3) {
556 return 0;
557 }
558
559 /* Switch to wider bus */
560 err = sdio_enable_4bit_bus(card);
561 if (err) {
562 goto out;
563 }
564
565 /* Set the driver strength for the card */
566 sdio_select_driver_type(card);
567
568 /* Set bus speed mode of the card */
569 err = sdio_set_bus_speed_mode(card);
570 if (err) {
571 goto out;
572 }
573
574 /*
575 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
576 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
577 */
578 if (!mmc_host_is_spi(card->host) &&
579 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) || (card->host->ios.timing == MMC_TIMING_UHS_SDR104))) {
580 err = mmc_execute_tuning(card);
581 }
582 out:
583 return err;
584 }
585
mmc_sdio_resend_if_cond(struct mmc_host * host,struct mmc_card * card)586 static void mmc_sdio_resend_if_cond(struct mmc_host *host, struct mmc_card *card)
587 {
588 sdio_reset(host);
589 mmc_go_idle(host);
590 mmc_send_if_cond(host, host->ocr_avail);
591 mmc_remove_card(card);
592 }
593
594 /*
595 * Handle the detection and initialisation of a card.
596 *
597 * In the case of a resume, "oldcard" will contain the card
598 * we're trying to reinitialise.
599 */
mmc_sdio_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard,int powered_resume)600 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, struct mmc_card *oldcard, int powered_resume)
601 {
602 struct mmc_card *card;
603 int err;
604 int retries = 10;
605 u32 rocr = 0;
606 u32 ocr_card = ocr;
607
608 WARN_ON(!host->claimed);
609
610 /* to query card if 1.8V signalling is supported */
611 if (mmc_host_uhs(host)) {
612 ocr |= R4_18V_PRESENT;
613 }
614
615 while (1) {
616 if (!retries) {
617 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
618 ocr &= ~R4_18V_PRESENT;
619 }
620
621 /*
622 * Inform the card of the voltage
623 */
624 #ifdef CONFIG_SDIO_KEEPALIVE
625 if (!(host->chip_alive)) {
626 if (!powered_resume) {
627 err = mmc_send_io_op_cond(host, ocr, &rocr);
628 if (err) {
629 pr_err("%s: mmc_send_io_op_cond() err=%d\n", __func__, err);
630 goto err;
631 }
632 }
633 } else {
634 rocr = 0xa0ffff00;
635 }
636 #else
637 if (!powered_resume) {
638 err = mmc_send_io_op_cond(host, ocr, &rocr);
639 if (err) {
640 goto err;
641 }
642 }
643 #endif
644
645 /*
646 * For SPI, enable CRC as appropriate.
647 */
648 if (mmc_host_is_spi(host)) {
649 err = mmc_spi_set_crc(host, use_spi_crc);
650 if (err) {
651 goto err;
652 }
653 }
654
655 /*
656 * Allocate card structure.
657 */
658 card = mmc_alloc_card(host, NULL);
659 if (IS_ERR(card)) {
660 err = PTR_ERR(card);
661 goto err;
662 }
663
664 if ((rocr & R4_MEMORY_PRESENT) && mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
665 card->type = MMC_TYPE_SD_COMBO;
666
667 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
668 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
669 mmc_remove_card(card);
670 return -ENOENT;
671 }
672 } else {
673 card->type = MMC_TYPE_SDIO;
674
675 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
676 mmc_remove_card(card);
677 return -ENOENT;
678 }
679 }
680
681 /*
682 * Call the optional HC's init_card function to handle quirks.
683 */
684 if (host->ops->init_card) {
685 host->ops->init_card(host, card);
686 }
687
688 card->ocr = ocr_card;
689
690 /*
691 * If the host and card support UHS-I mode request the card
692 * to switch to 1.8V signaling level. No 1.8v signalling if
693 * UHS mode is not enabled to maintain compatibility and some
694 * systems that claim 1.8v signalling in fact do not support
695 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
696 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
697 * fails to check rocr & R4_18V_PRESENT, but we still need to
698 * try to init uhs card. sdio_read_cccr will take over this task
699 * to make sure which speed mode should work.
700 */
701 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
702 err = mmc_set_uhs_voltage(host, ocr_card);
703 if (err == -EAGAIN) {
704 mmc_sdio_resend_if_cond(host, card);
705 retries--;
706 continue;
707 } else if (err) {
708 ocr &= ~R4_18V_PRESENT;
709 }
710 }
711
712 /*
713 * For native busses: set card RCA and quit open drain mode.
714 */
715 if (!powered_resume && !mmc_host_is_spi(host)) {
716 #ifdef CONFIG_SDIO_KEEPALIVE
717 if (!(host->chip_alive)) {
718 err = mmc_send_relative_addr(host, &card->rca);
719 if (err) {
720 goto remove;
721 }
722 } else {
723 card->rca = 1;
724 }
725 #else
726 err = mmc_send_relative_addr(host, &card->rca);
727 if (err) {
728 goto remove;
729 }
730 #endif
731
732 /*
733 * Update oldcard with the new RCA received from the SDIO
734 * device -- we're doing this so that it's updated in the
735 * "card" struct when oldcard overwrites that later.
736 */
737 if (oldcard) {
738 oldcard->rca = card->rca;
739 }
740 }
741
742 /*
743 * Read CSD, before selecting the card
744 */
745 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
746 err = mmc_sd_get_csd(host, card);
747 if (err) {
748 return err;
749 }
750
751 mmc_decode_cid(card);
752 }
753
754 /*
755 * Select card, as all following commands rely on that.
756 */
757 if (!powered_resume && !mmc_host_is_spi(host)) {
758 err = mmc_select_card(card);
759 if (err) {
760 goto remove;
761 }
762 }
763
764 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
765 /*
766 * This is non-standard SDIO device, meaning it doesn't
767 * have any CIA (Common I/O area) registers present.
768 * It's host's responsibility to fill cccr and cis
769 * structures in init_card().
770 */
771 mmc_set_clock(host, card->cis.max_dtr);
772
773 if (card->cccr.high_speed) {
774 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
775 }
776
777 goto finish;
778 }
779
780 /*
781 * Read the common registers. Note that we should try to
782 * validate whether UHS would work or not.
783 */
784 err = sdio_read_cccr(card, ocr);
785 if (err) {
786 mmc_sdio_resend_if_cond(host, card);
787 if (ocr & R4_18V_PRESENT) {
788 /* Retry init sequence, but without R4_18V_PRESENT. */
789 retries = 0;
790 continue;
791 }
792 return err;
793 }
794 break;
795 }
796
797 /*
798 * Read the common CIS tuples.
799 */
800 err = sdio_read_common_cis(card);
801 if (err) {
802 goto remove;
803 }
804
805 if (oldcard) {
806 int same = (card->cis.vendor == oldcard->cis.vendor && card->cis.device == oldcard->cis.device);
807 mmc_remove_card(card);
808 if (!same) {
809 return -ENOENT;
810 }
811
812 card = oldcard;
813 }
814 mmc_fixup_device(card, sdio_fixup_methods);
815
816 if (card->type == MMC_TYPE_SD_COMBO) {
817 err = mmc_sd_setup_card(host, card, oldcard != NULL);
818 /* handle as SDIO-only card if memory init failed */
819 if (err) {
820 mmc_go_idle(host);
821 if (mmc_host_is_spi(host)) {
822 /* should not fail, as it worked previously */
823 mmc_spi_set_crc(host, use_spi_crc);
824 }
825 card->type = MMC_TYPE_SDIO;
826 } else {
827 card->dev.type = &sd_type;
828 }
829 }
830
831 /*
832 * If needed, disconnect card detection pull-up resistor.
833 */
834 err = sdio_disable_cd(card);
835 if (err) {
836 goto remove;
837 }
838
839 /* Initialization sequence for UHS-I cards */
840 /* Only if card supports 1.8v and UHS signaling */
841 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
842 err = mmc_sdio_init_uhs_card(card);
843 if (err) {
844 goto remove;
845 }
846 } else {
847 /*
848 * Switch to high-speed (if supported).
849 */
850 err = sdio_enable_hs(card);
851 if (err > 0) {
852 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
853 } else if (err) {
854 goto remove;
855 }
856
857 /*
858 * Change to the card's maximum speed.
859 */
860 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
861
862 /*
863 * Switch to wider bus (if supported).
864 */
865 err = sdio_enable_4bit_bus(card);
866 if (err) {
867 goto remove;
868 }
869 }
870
871 if ((host->caps2 & MMC_CAP2_AVOID_3_3V) && (host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330)) {
872 pr_err("%s: Host failed to negotiate down from 3.3V\n", mmc_hostname(host));
873 err = -EINVAL;
874 goto remove;
875 }
876 finish:
877 if (!oldcard) {
878 host->card = card;
879 }
880 return 0;
881
882 remove:
883 if (!oldcard) {
884 mmc_remove_card(card);
885 }
886
887 err:
888 return err;
889 }
890
mmc_sdio_reinit_card(struct mmc_host * host,bool powered_resume)891 static int mmc_sdio_reinit_card(struct mmc_host *host, bool powered_resume)
892 {
893 int ret;
894
895 sdio_reset(host);
896 mmc_go_idle(host);
897 mmc_send_if_cond(host, host->card->ocr);
898
899 ret = mmc_send_io_op_cond(host, 0, NULL);
900 if (ret) {
901 return ret;
902 }
903
904 return mmc_sdio_init_card(host, host->card->ocr, host->card, powered_resume);
905 }
906
907 /*
908 * Host is being removed. Free up the current card.
909 */
mmc_sdio_remove(struct mmc_host * host)910 static void mmc_sdio_remove(struct mmc_host *host)
911 {
912 int i;
913
914 for (i = 0; i < host->card->sdio_funcs; i++) {
915 if (host->card->sdio_func[i]) {
916 sdio_remove_func(host->card->sdio_func[i]);
917 host->card->sdio_func[i] = NULL;
918 }
919 }
920
921 mmc_remove_card(host->card);
922 host->card = NULL;
923 }
924
925 /*
926 * Card detection - card is alive.
927 */
mmc_sdio_alive(struct mmc_host * host)928 static int mmc_sdio_alive(struct mmc_host *host)
929 {
930 return mmc_select_card(host->card);
931 }
932
933 /*
934 * Card detection callback from host.
935 */
mmc_sdio_detect(struct mmc_host * host)936 static void mmc_sdio_detect(struct mmc_host *host)
937 {
938 int err;
939
940 /* Make sure card is powered before detecting it */
941 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
942 err = pm_runtime_get_sync(&host->card->dev);
943 if (err < 0) {
944 pm_runtime_put_noidle(&host->card->dev);
945 goto out;
946 }
947 }
948
949 mmc_claim_host(host);
950
951 /*
952 * Just check if our card has been removed.
953 */
954 err = _mmc_detect_card_removed(host);
955
956 mmc_release_host(host);
957
958 /*
959 * Tell PM core it's OK to power off the card now.
960 *
961 * The _sync variant is used in order to ensure that the card
962 * is left powered off in case an error occurred, and the card
963 * is going to be removed.
964 *
965 * Since there is no specific reason to believe a new user
966 * is about to show up at this point, the _sync variant is
967 * desirable anyway.
968 */
969 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
970 pm_runtime_put_sync(&host->card->dev);
971 }
972
973 out:
974 if (err) {
975 mmc_sdio_remove(host);
976
977 mmc_claim_host(host);
978 mmc_detach_bus(host);
979 mmc_power_off(host);
980 mmc_release_host(host);
981 }
982 }
983
984 /*
985 * SDIO pre_suspend. We need to suspend all functions separately.
986 * Therefore all registered functions must have drivers with suspend
987 * and resume methods. Failing that we simply remove the whole card.
988 */
mmc_sdio_pre_suspend(struct mmc_host * host)989 static int mmc_sdio_pre_suspend(struct mmc_host *host)
990 {
991 int i, err = 0;
992
993 for (i = 0; i < host->card->sdio_funcs; i++) {
994 struct sdio_func *func = host->card->sdio_func[i];
995 if (func && sdio_func_present(func) && func->dev.driver) {
996 const struct dev_pm_ops *pmops = func->dev.driver->pm;
997 if (!pmops || !pmops->suspend || !pmops->resume) {
998 /* force removal of entire card in that case */
999 err = -ENOSYS;
1000 break;
1001 }
1002 }
1003 }
1004
1005 return err;
1006 }
1007
1008 /*
1009 * SDIO suspend. Suspend all functions separately.
1010 */
mmc_sdio_suspend(struct mmc_host * host)1011 static int mmc_sdio_suspend(struct mmc_host *host)
1012 {
1013 /* Prevent processing of SDIO IRQs in suspended state. */
1014 mmc_card_set_suspended(host->card);
1015 cancel_delayed_work_sync(&host->sdio_irq_work);
1016
1017 mmc_claim_host(host);
1018
1019 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
1020 sdio_disable_wide(host->card);
1021 }
1022
1023 if (!mmc_card_keep_power(host)) {
1024 mmc_power_off(host);
1025 } else if (host->retune_period) {
1026 mmc_retune_timer_stop(host);
1027 mmc_retune_needed(host);
1028 }
1029
1030 mmc_release_host(host);
1031
1032 return 0;
1033 }
1034
mmc_sdio_resume(struct mmc_host * host)1035 static int mmc_sdio_resume(struct mmc_host *host)
1036 {
1037 int err = 0;
1038
1039 /* Basic card reinitialization. */
1040 mmc_claim_host(host);
1041
1042 /* Restore power if needed */
1043 if (!mmc_card_keep_power(host)) {
1044 mmc_power_up(host, host->card->ocr);
1045 /*
1046 * Tell runtime PM core we just powered up the card,
1047 * since it still believes the card is powered off.
1048 * Note that currently runtime PM is only enabled
1049 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1050 */
1051 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1052 pm_runtime_disable(&host->card->dev);
1053 pm_runtime_set_active(&host->card->dev);
1054 pm_runtime_enable(&host->card->dev);
1055 }
1056 }
1057
1058 /* No need to reinitialize powered-resumed nonremovable cards */
1059 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
1060 err = mmc_sdio_reinit_card(host, mmc_card_keep_power(host));
1061 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
1062 /* We may have switched to 1-bit mode during suspend */
1063 err = sdio_enable_4bit_bus(host->card);
1064 }
1065
1066 if (err) {
1067 goto out;
1068 }
1069
1070 /* Allow SDIO IRQs to be processed again. */
1071 mmc_card_clr_suspended(host->card);
1072
1073 if (host->sdio_irqs) {
1074 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
1075 wake_up_process(host->sdio_irq_thread);
1076 } else if (host->caps & MMC_CAP_SDIO_IRQ) {
1077 host->ops->enable_sdio_irq(host, 1);
1078 }
1079 }
1080
1081 out:
1082 mmc_release_host(host);
1083
1084 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1085 return err;
1086 }
1087
mmc_sdio_power_restore(struct mmc_host * host)1088 static int mmc_sdio_power_restore(struct mmc_host *host)
1089 {
1090 int ret;
1091
1092 /*
1093 * Reset the card by performing the same steps that are taken by
1094 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1095 *
1096 * sdio_reset() is technically not needed. Having just powered up the
1097 * hardware, it should already be in reset state. However, some
1098 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1099 * meaning that a reset is required when restoring power soon after
1100 * powering off. It is harmless in other cases.
1101 *
1102 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1103 * is not necessary for non-removable cards. However, it is required
1104 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1105 * harmless in other situations.
1106 *
1107 */
1108
1109 mmc_claim_host(host);
1110
1111 ret = mmc_sdio_reinit_card(host, mmc_card_keep_power(host));
1112 if (!ret && host->sdio_irqs) {
1113 mmc_signal_sdio_irq(host);
1114 }
1115
1116 mmc_release_host(host);
1117
1118 return ret;
1119 }
1120
mmc_sdio_runtime_suspend(struct mmc_host * host)1121 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1122 {
1123 /* No references to the card, cut the power to it. */
1124 mmc_claim_host(host);
1125 mmc_power_off(host);
1126 mmc_release_host(host);
1127
1128 return 0;
1129 }
1130
mmc_sdio_runtime_resume(struct mmc_host * host)1131 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1132 {
1133 int ret;
1134
1135 /* Restore power and re-initialize. */
1136 mmc_claim_host(host);
1137 mmc_power_up(host, host->card->ocr);
1138 ret = mmc_sdio_power_restore(host);
1139 mmc_release_host(host);
1140
1141 return ret;
1142 }
1143
mmc_sdio_hw_reset(struct mmc_host * host)1144 static int mmc_sdio_hw_reset(struct mmc_host *host)
1145 {
1146 mmc_power_cycle(host, host->card->ocr);
1147 return mmc_sdio_power_restore(host);
1148 }
1149
mmc_sdio_sw_reset(struct mmc_host * host)1150 static int mmc_sdio_sw_reset(struct mmc_host *host)
1151 {
1152 mmc_set_clock(host, host->f_init);
1153 sdio_reset(host);
1154 mmc_go_idle(host);
1155
1156 mmc_set_initial_state(host);
1157 mmc_set_initial_signal_voltage(host);
1158
1159 return mmc_sdio_reinit_card(host, 0);
1160 }
1161
1162 static const struct mmc_bus_ops mmc_sdio_ops = {
1163 .remove = mmc_sdio_remove,
1164 .detect = mmc_sdio_detect,
1165 .pre_suspend = mmc_sdio_pre_suspend,
1166 .suspend = mmc_sdio_suspend,
1167 .resume = mmc_sdio_resume,
1168 .runtime_suspend = mmc_sdio_runtime_suspend,
1169 .runtime_resume = mmc_sdio_runtime_resume,
1170 .alive = mmc_sdio_alive,
1171 .hw_reset = mmc_sdio_hw_reset,
1172 .sw_reset = mmc_sdio_sw_reset,
1173 };
1174
1175 /*
1176 * Starting point for SDIO card init.
1177 */
mmc_attach_sdio(struct mmc_host * host)1178 int mmc_attach_sdio(struct mmc_host *host)
1179 {
1180 int err, i, funcs;
1181 u32 ocr, rocr;
1182 struct mmc_card *card;
1183
1184 WARN_ON(!host->claimed);
1185
1186 #ifdef CONFIG_SDIO_KEEPALIVE
1187 if (!(host->chip_alive)) {
1188 err = mmc_send_io_op_cond(host, 0, &ocr);
1189 if (err) {
1190 pr_err("%s mmc_send_io_op_cond err: %d\n", mmc_hostname(host), err);
1191 return err;
1192 }
1193 } else {
1194 ocr = 0x20ffff00;
1195 }
1196 #else
1197 err = mmc_send_io_op_cond(host, 0, &ocr);
1198 if (err) {
1199 return err;
1200 }
1201 #endif
1202
1203 mmc_attach_bus(host, &mmc_sdio_ops);
1204 if (host->ocr_avail_sdio) {
1205 host->ocr_avail = host->ocr_avail_sdio;
1206 }
1207
1208 rocr = mmc_select_voltage(host, ocr);
1209 /*
1210 * Can we support the voltage(s) of the card(s)?
1211 */
1212 if (!rocr) {
1213 err = -EINVAL;
1214 goto err;
1215 }
1216
1217 /*
1218 * Detect and init the card.
1219 */
1220 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1221 if (err) {
1222 goto err;
1223 }
1224
1225 card = host->card;
1226
1227 /*
1228 * Enable runtime PM only if supported by host+card+board
1229 */
1230 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1231 /*
1232 * Do not allow runtime suspend until after SDIO function
1233 * devices are added.
1234 */
1235 pm_runtime_get_noresume(&card->dev);
1236
1237 /*
1238 * Let runtime PM core know our card is active
1239 */
1240 err = pm_runtime_set_active(&card->dev);
1241 if (err) {
1242 goto remove;
1243 }
1244
1245 /*
1246 * Enable runtime PM for this card
1247 */
1248 pm_runtime_enable(&card->dev);
1249 }
1250
1251 /*
1252 * The number of functions on the card is encoded inside
1253 * the ocr.
1254 */
1255 funcs = (ocr & 0x70000000) >> SDIO_DWORD_SHIFT_MASK;
1256 card->sdio_funcs = 0;
1257
1258 /*
1259 * Initialize (but don't add) all present functions.
1260 */
1261 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1262 err = sdio_init_func(host->card, i + 1);
1263 if (err) {
1264 goto remove;
1265 }
1266
1267 /*
1268 * Enable Runtime PM for this func (if supported)
1269 */
1270 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1271 pm_runtime_enable(&card->sdio_func[i]->dev);
1272 }
1273 }
1274
1275 #ifdef CONFIG_SDIO_KEEPALIVE
1276 if (host->card->sdio_func[1]) {
1277 host->card->sdio_func[1]->card_alive = host->chip_alive;
1278 }
1279 #endif
1280
1281 /*
1282 * First add the card to the driver model...
1283 */
1284 mmc_release_host(host);
1285 err = mmc_add_card(host->card);
1286 if (err) {
1287 goto remove_added;
1288 }
1289
1290 /*
1291 * ...then the SDIO functions.
1292 */
1293 for (i = 0; i < funcs; i++) {
1294 err = sdio_add_func(host->card->sdio_func[i]);
1295 if (err) {
1296 goto remove_added;
1297 }
1298 }
1299
1300 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1301 pm_runtime_put(&card->dev);
1302 }
1303
1304 mmc_claim_host(host);
1305 return 0;
1306
1307 remove:
1308 mmc_release_host(host);
1309 remove_added:
1310 /*
1311 * The devices are being deleted so it is not necessary to disable
1312 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1313 * because it needs to be active to remove any function devices that
1314 * were probed, and after that it gets deleted.
1315 */
1316 mmc_sdio_remove(host);
1317 mmc_claim_host(host);
1318 err:
1319 mmc_detach_bus(host);
1320
1321 pr_err("%s: error %d whilst initialising SDIO card\n", mmc_hostname(host), err);
1322
1323 return err;
1324 }
1325
sdio_reset_comm(struct mmc_card * card)1326 int sdio_reset_comm(struct mmc_card *card)
1327 {
1328 struct mmc_host *host = card->host;
1329 u32 ocr;
1330 u32 rocr;
1331 int err;
1332
1333 #ifdef CONFIG_SDIO_KEEPALIVE
1334 if (host->chip_alive) {
1335 host->chip_alive = 0;
1336 }
1337 #endif
1338
1339 printk("%s():\n", __func__);
1340 mmc_claim_host(host);
1341
1342 mmc_retune_disable(host);
1343
1344 mmc_power_cycle(host, host->card->ocr);
1345 mmc_go_idle(host);
1346
1347 mmc_set_clock(host, host->f_min);
1348
1349 err = mmc_send_io_op_cond(host, 0, &ocr);
1350 if (err) {
1351 goto err;
1352 }
1353
1354 rocr = mmc_select_voltage(host, ocr);
1355 if (!rocr) {
1356 err = -EINVAL;
1357 goto err;
1358 }
1359
1360 err = mmc_sdio_init_card(host, rocr, card, 0);
1361 if (err) {
1362 goto err;
1363 }
1364
1365 mmc_release_host(host);
1366 return 0;
1367 err:
1368 printk("%s: Error resetting SDIO communications (%d)\n", mmc_hostname(host), err);
1369 mmc_release_host(host);
1370 return err;
1371 }
1372 EXPORT_SYMBOL(sdio_reset_comm);
1373