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spi: sprd: adi: Remove redundant address bits setting
[linux/fpc-iii.git] / drivers / mmc / core / sdio.c
blob8dd8fc32eccafb748ce4551fd55199d001b987b8
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
8 #include <linux/err.h>
9 #include <linux/pm_runtime.h>
10
11 #include <linux/mmc/host.h>
12 #include <linux/mmc/card.h>
13 #include <linux/mmc/mmc.h>
14 #include <linux/mmc/sdio.h>
15 #include <linux/mmc/sdio_func.h>
16 #include <linux/mmc/sdio_ids.h>
17
18 #include "core.h"
19 #include "card.h"
20 #include "host.h"
21 #include "bus.h"
22 #include "quirks.h"
23 #include "sd.h"
24 #include "sdio_bus.h"
25 #include "mmc_ops.h"
26 #include "sd_ops.h"
27 #include "sdio_ops.h"
28 #include "sdio_cis.h"
29
30 static int sdio_read_fbr(struct sdio_func *func)
31 {
32 int ret;
33 unsigned char data;
34
35 if (mmc_card_nonstd_func_interface(func->card)) {
36 func->class = SDIO_CLASS_NONE;
37 return 0;
38 }
39
40 ret = mmc_io_rw_direct(func->card, 0, 0,
41 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
42 if (ret)
43 goto out;
44
45 data &= 0x0f;
46
47 if (data == 0x0f) {
48 ret = mmc_io_rw_direct(func->card, 0, 0,
49 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
50 if (ret)
51 goto out;
52 }
53
54 func->class = data;
55
56 out:
57 return ret;
58 }
59
60 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
61 {
62 int ret;
63 struct sdio_func *func;
64
65 if (WARN_ON(fn > SDIO_MAX_FUNCS))
66 return -EINVAL;
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 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
110 if (ret)
111 goto out;
112
113 cccr_vsn = data & 0x0f;
114
115 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
116 pr_err("%s: unrecognised CCCR structure version %d\n",
117 mmc_hostname(card->host), cccr_vsn);
118 return -EINVAL;
119 }
120
121 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
122
123 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
124 if (ret)
125 goto out;
126
127 if (data & SDIO_CCCR_CAP_SMB)
128 card->cccr.multi_block = 1;
129 if (data & SDIO_CCCR_CAP_LSC)
130 card->cccr.low_speed = 1;
131 if (data & SDIO_CCCR_CAP_4BLS)
132 card->cccr.wide_bus = 1;
133
134 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
135 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
136 if (ret)
137 goto out;
138
139 if (data & SDIO_POWER_SMPC)
140 card->cccr.high_power = 1;
141 }
142
143 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
144 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
145 if (ret)
146 goto out;
147
148 card->scr.sda_spec3 = 0;
149 card->sw_caps.sd3_bus_mode = 0;
150 card->sw_caps.sd3_drv_type = 0;
151 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
152 card->scr.sda_spec3 = 1;
153 ret = mmc_io_rw_direct(card, 0, 0,
154 SDIO_CCCR_UHS, 0, &data);
155 if (ret)
156 goto out;
157
158 if (mmc_host_uhs(card->host)) {
159 if (data & SDIO_UHS_DDR50)
160 card->sw_caps.sd3_bus_mode
161 |= SD_MODE_UHS_DDR50;
162
163 if (data & SDIO_UHS_SDR50)
164 card->sw_caps.sd3_bus_mode
165 |= SD_MODE_UHS_SDR50;
166
167 if (data & SDIO_UHS_SDR104)
168 card->sw_caps.sd3_bus_mode
169 |= SD_MODE_UHS_SDR104;
170 }
171
172 ret = mmc_io_rw_direct(card, 0, 0,
173 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
174 if (ret)
175 goto out;
176
177 if (data & SDIO_DRIVE_SDTA)
178 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
179 if (data & SDIO_DRIVE_SDTC)
180 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
181 if (data & SDIO_DRIVE_SDTD)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
183 }
184
185 /* if no uhs mode ensure we check for high speed */
186 if (!card->sw_caps.sd3_bus_mode) {
187 if (speed & SDIO_SPEED_SHS) {
188 card->cccr.high_speed = 1;
189 card->sw_caps.hs_max_dtr = 50000000;
190 } else {
191 card->cccr.high_speed = 0;
192 card->sw_caps.hs_max_dtr = 25000000;
193 }
194 }
195 }
196
197 out:
198 return ret;
199 }
200
201 static int sdio_enable_wide(struct mmc_card *card)
202 {
203 int ret;
204 u8 ctrl;
205
206 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
207 return 0;
208
209 if (card->cccr.low_speed && !card->cccr.wide_bus)
210 return 0;
211
212 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
213 if (ret)
214 return ret;
215
216 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
217 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
218 mmc_hostname(card->host), ctrl);
219
220 /* set as 4-bit bus width */
221 ctrl &= ~SDIO_BUS_WIDTH_MASK;
222 ctrl |= SDIO_BUS_WIDTH_4BIT;
223
224 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
225 if (ret)
226 return ret;
227
228 return 1;
229 }
230
231 /*
232 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
233 * of the card. This may be required on certain setups of boards,
234 * controllers and embedded sdio device which do not need the card's
235 * pull-up. As a result, card detection is disabled and power is saved.
236 */
237 static int sdio_disable_cd(struct mmc_card *card)
238 {
239 int ret;
240 u8 ctrl;
241
242 if (!mmc_card_disable_cd(card))
243 return 0;
244
245 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
246 if (ret)
247 return ret;
248
249 ctrl |= SDIO_BUS_CD_DISABLE;
250
251 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
252 }
253
254 /*
255 * Devices that remain active during a system suspend are
256 * put back into 1-bit mode.
257 */
258 static int sdio_disable_wide(struct mmc_card *card)
259 {
260 int ret;
261 u8 ctrl;
262
263 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
264 return 0;
265
266 if (card->cccr.low_speed && !card->cccr.wide_bus)
267 return 0;
268
269 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
270 if (ret)
271 return ret;
272
273 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
274 return 0;
275
276 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
277 ctrl |= SDIO_BUS_ASYNC_INT;
278
279 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
280 if (ret)
281 return ret;
282
283 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
284
285 return 0;
286 }
287
288
289 static int sdio_enable_4bit_bus(struct mmc_card *card)
290 {
291 int err;
292
293 if (card->type == MMC_TYPE_SDIO)
294 err = sdio_enable_wide(card);
295 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
296 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
297 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
298 if (err)
299 return err;
300 err = sdio_enable_wide(card);
301 if (err <= 0)
302 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
303 } else
304 return 0;
305
306 if (err > 0) {
307 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
308 err = 0;
309 }
310
311 return err;
312 }
313
314
315 /*
316 * Test if the card supports high-speed mode and, if so, switch to it.
317 */
318 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
319 {
320 int ret;
321 u8 speed;
322
323 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
324 return 0;
325
326 if (!card->cccr.high_speed)
327 return 0;
328
329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
330 if (ret)
331 return ret;
332
333 if (enable)
334 speed |= SDIO_SPEED_EHS;
335 else
336 speed &= ~SDIO_SPEED_EHS;
337
338 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
339 if (ret)
340 return ret;
341
342 return 1;
343 }
344
345 /*
346 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
347 */
348 static int sdio_enable_hs(struct mmc_card *card)
349 {
350 int ret;
351
352 ret = mmc_sdio_switch_hs(card, true);
353 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
354 return ret;
355
356 ret = mmc_sd_switch_hs(card);
357 if (ret <= 0)
358 mmc_sdio_switch_hs(card, false);
359
360 return ret;
361 }
362
363 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
364 {
365 unsigned max_dtr;
366
367 if (mmc_card_hs(card)) {
368 /*
369 * The SDIO specification doesn't mention how
370 * the CIS transfer speed register relates to
371 * high-speed, but it seems that 50 MHz is
372 * mandatory.
373 */
374 max_dtr = 50000000;
375 } else {
376 max_dtr = card->cis.max_dtr;
377 }
378
379 if (card->type == MMC_TYPE_SD_COMBO)
380 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
381
382 return max_dtr;
383 }
384
385 static unsigned char host_drive_to_sdio_drive(int host_strength)
386 {
387 switch (host_strength) {
388 case MMC_SET_DRIVER_TYPE_A:
389 return SDIO_DTSx_SET_TYPE_A;
390 case MMC_SET_DRIVER_TYPE_B:
391 return SDIO_DTSx_SET_TYPE_B;
392 case MMC_SET_DRIVER_TYPE_C:
393 return SDIO_DTSx_SET_TYPE_C;
394 case MMC_SET_DRIVER_TYPE_D:
395 return SDIO_DTSx_SET_TYPE_D;
396 default:
397 return SDIO_DTSx_SET_TYPE_B;
398 }
399 }
400
401 static void sdio_select_driver_type(struct mmc_card *card)
402 {
403 int card_drv_type, drive_strength, drv_type;
404 unsigned char card_strength;
405 int err;
406
407 card->drive_strength = 0;
408
409 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
410
411 drive_strength = mmc_select_drive_strength(card,
412 card->sw_caps.uhs_max_dtr,
413 card_drv_type, &drv_type);
414
415 if (drive_strength) {
416 /* if error just use default for drive strength B */
417 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
418 &card_strength);
419 if (err)
420 return;
421
422 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
423 card_strength |= host_drive_to_sdio_drive(drive_strength);
424
425 /* if error default to drive strength B */
426 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
427 card_strength, NULL);
428 if (err)
429 return;
430 card->drive_strength = drive_strength;
431 }
432
433 if (drv_type)
434 mmc_set_driver_type(card->host, drv_type);
435 }
436
437
438 static int sdio_set_bus_speed_mode(struct mmc_card *card)
439 {
440 unsigned int bus_speed, timing;
441 int err;
442 unsigned char speed;
443 unsigned int max_rate;
444
445 /*
446 * If the host doesn't support any of the UHS-I modes, fallback on
447 * default speed.
448 */
449 if (!mmc_host_uhs(card->host))
450 return 0;
451
452 bus_speed = SDIO_SPEED_SDR12;
453 timing = MMC_TIMING_UHS_SDR12;
454 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
455 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
456 bus_speed = SDIO_SPEED_SDR104;
457 timing = MMC_TIMING_UHS_SDR104;
458 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
459 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
460 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
461 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
462 bus_speed = SDIO_SPEED_DDR50;
463 timing = MMC_TIMING_UHS_DDR50;
464 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
465 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
466 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
467 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
468 SD_MODE_UHS_SDR50)) {
469 bus_speed = SDIO_SPEED_SDR50;
470 timing = MMC_TIMING_UHS_SDR50;
471 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
472 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
473 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
474 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
475 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
476 bus_speed = SDIO_SPEED_SDR25;
477 timing = MMC_TIMING_UHS_SDR25;
478 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
479 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
480 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
481 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
482 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
483 SD_MODE_UHS_SDR12)) {
484 bus_speed = SDIO_SPEED_SDR12;
485 timing = MMC_TIMING_UHS_SDR12;
486 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
487 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
488 }
489
490 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
491 if (err)
492 return err;
493
494 speed &= ~SDIO_SPEED_BSS_MASK;
495 speed |= bus_speed;
496 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
497 if (err)
498 return err;
499
500 max_rate = min_not_zero(card->quirk_max_rate,
501 card->sw_caps.uhs_max_dtr);
502
503 if (bus_speed) {
504 mmc_set_timing(card->host, timing);
505 mmc_set_clock(card->host, max_rate);
506 }
507
508 return 0;
509 }
510
511 /*
512 * UHS-I specific initialization procedure
513 */
514 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
515 {
516 int err;
517
518 if (!card->scr.sda_spec3)
519 return 0;
520
521 /* Switch to wider bus */
522 err = sdio_enable_4bit_bus(card);
523 if (err)
524 goto out;
525
526 /* Set the driver strength for the card */
527 sdio_select_driver_type(card);
528
529 /* Set bus speed mode of the card */
530 err = sdio_set_bus_speed_mode(card);
531 if (err)
532 goto out;
533
534 /*
535 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
536 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
537 */
538 if (!mmc_host_is_spi(card->host) &&
539 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
540 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
541 err = mmc_execute_tuning(card);
542 out:
543 return err;
544 }
545
546 static void mmc_sdio_resend_if_cond(struct mmc_host *host,
547 struct mmc_card *card)
548 {
549 sdio_reset(host);
550 mmc_go_idle(host);
551 mmc_send_if_cond(host, host->ocr_avail);
552 mmc_remove_card(card);
553 }
554
555 /*
556 * Handle the detection and initialisation of a card.
557 *
558 * In the case of a resume, "oldcard" will contain the card
559 * we're trying to reinitialise.
560 */
561 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
562 struct mmc_card *oldcard)
563 {
564 struct mmc_card *card;
565 int err;
566 int retries = 10;
567 u32 rocr = 0;
568 u32 ocr_card = ocr;
569
570 WARN_ON(!host->claimed);
571
572 /* to query card if 1.8V signalling is supported */
573 if (mmc_host_uhs(host))
574 ocr |= R4_18V_PRESENT;
575
576 try_again:
577 if (!retries) {
578 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
579 ocr &= ~R4_18V_PRESENT;
580 }
581
582 /*
583 * Inform the card of the voltage
584 */
585 err = mmc_send_io_op_cond(host, ocr, &rocr);
586 if (err)
587 goto err;
588
589 /*
590 * For SPI, enable CRC as appropriate.
591 */
592 if (mmc_host_is_spi(host)) {
593 err = mmc_spi_set_crc(host, use_spi_crc);
594 if (err)
595 goto err;
596 }
597
598 /*
599 * Allocate card structure.
600 */
601 card = mmc_alloc_card(host, NULL);
602 if (IS_ERR(card)) {
603 err = PTR_ERR(card);
604 goto err;
605 }
606
607 if ((rocr & R4_MEMORY_PRESENT) &&
608 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
609 card->type = MMC_TYPE_SD_COMBO;
610
611 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
612 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
613 mmc_remove_card(card);
614 pr_debug("%s: Perhaps the card was replaced\n",
615 mmc_hostname(host));
616 return -ENOENT;
617 }
618 } else {
619 card->type = MMC_TYPE_SDIO;
620
621 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
622 mmc_remove_card(card);
623 pr_debug("%s: Perhaps the card was replaced\n",
624 mmc_hostname(host));
625 return -ENOENT;
626 }
627 }
628
629 /*
630 * Call the optional HC's init_card function to handle quirks.
631 */
632 if (host->ops->init_card)
633 host->ops->init_card(host, card);
634
635 /*
636 * If the host and card support UHS-I mode request the card
637 * to switch to 1.8V signaling level. No 1.8v signalling if
638 * UHS mode is not enabled to maintain compatibility and some
639 * systems that claim 1.8v signalling in fact do not support
640 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
641 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
642 * fails to check rocr & R4_18V_PRESENT, but we still need to
643 * try to init uhs card. sdio_read_cccr will take over this task
644 * to make sure which speed mode should work.
645 */
646 if (rocr & ocr & R4_18V_PRESENT) {
647 err = mmc_set_uhs_voltage(host, ocr_card);
648 if (err == -EAGAIN) {
649 mmc_sdio_resend_if_cond(host, card);
650 retries--;
651 goto try_again;
652 } else if (err) {
653 ocr &= ~R4_18V_PRESENT;
654 }
655 }
656
657 /*
658 * For native busses: set card RCA and quit open drain mode.
659 */
660 if (!mmc_host_is_spi(host)) {
661 err = mmc_send_relative_addr(host, &card->rca);
662 if (err)
663 goto remove;
664
665 /*
666 * Update oldcard with the new RCA received from the SDIO
667 * device -- we're doing this so that it's updated in the
668 * "card" struct when oldcard overwrites that later.
669 */
670 if (oldcard)
671 oldcard->rca = card->rca;
672 }
673
674 /*
675 * Read CSD, before selecting the card
676 */
677 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
678 err = mmc_sd_get_csd(host, card);
679 if (err)
680 return err;
681
682 mmc_decode_cid(card);
683 }
684
685 /*
686 * Select card, as all following commands rely on that.
687 */
688 if (!mmc_host_is_spi(host)) {
689 err = mmc_select_card(card);
690 if (err)
691 goto remove;
692 }
693
694 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
695 /*
696 * This is non-standard SDIO device, meaning it doesn't
697 * have any CIA (Common I/O area) registers present.
698 * It's host's responsibility to fill cccr and cis
699 * structures in init_card().
700 */
701 mmc_set_clock(host, card->cis.max_dtr);
702
703 if (card->cccr.high_speed) {
704 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
705 }
706
707 goto finish;
708 }
709
710 /*
711 * Read the common registers. Note that we should try to
712 * validate whether UHS would work or not.
713 */
714 err = sdio_read_cccr(card, ocr);
715 if (err) {
716 mmc_sdio_resend_if_cond(host, card);
717 if (ocr & R4_18V_PRESENT) {
718 /* Retry init sequence, but without R4_18V_PRESENT. */
719 retries = 0;
720 goto try_again;
721 } else {
722 goto remove;
723 }
724 }
725
726 /*
727 * Read the common CIS tuples.
728 */
729 err = sdio_read_common_cis(card);
730 if (err)
731 goto remove;
732
733 if (oldcard) {
734 int same = (card->cis.vendor == oldcard->cis.vendor &&
735 card->cis.device == oldcard->cis.device);
736 mmc_remove_card(card);
737 if (!same) {
738 pr_debug("%s: Perhaps the card was replaced\n",
739 mmc_hostname(host));
740 return -ENOENT;
741 }
742
743 card = oldcard;
744 }
745 card->ocr = ocr_card;
746 mmc_fixup_device(card, sdio_fixup_methods);
747
748 if (card->type == MMC_TYPE_SD_COMBO) {
749 err = mmc_sd_setup_card(host, card, oldcard != NULL);
750 /* handle as SDIO-only card if memory init failed */
751 if (err) {
752 mmc_go_idle(host);
753 if (mmc_host_is_spi(host))
754 /* should not fail, as it worked previously */
755 mmc_spi_set_crc(host, use_spi_crc);
756 card->type = MMC_TYPE_SDIO;
757 } else
758 card->dev.type = &sd_type;
759 }
760
761 /*
762 * If needed, disconnect card detection pull-up resistor.
763 */
764 err = sdio_disable_cd(card);
765 if (err)
766 goto remove;
767
768 /* Initialization sequence for UHS-I cards */
769 /* Only if card supports 1.8v and UHS signaling */
770 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
771 err = mmc_sdio_init_uhs_card(card);
772 if (err)
773 goto remove;
774 } else {
775 /*
776 * Switch to high-speed (if supported).
777 */
778 err = sdio_enable_hs(card);
779 if (err > 0)
780 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
781 else if (err)
782 goto remove;
783
784 /*
785 * Change to the card's maximum speed.
786 */
787 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
788
789 /*
790 * Switch to wider bus (if supported).
791 */
792 err = sdio_enable_4bit_bus(card);
793 if (err)
794 goto remove;
795 }
796
797 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
798 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
799 pr_err("%s: Host failed to negotiate down from 3.3V\n",
800 mmc_hostname(host));
801 err = -EINVAL;
802 goto remove;
803 }
804 finish:
805 if (!oldcard)
806 host->card = card;
807 return 0;
808
809 remove:
810 if (!oldcard)
811 mmc_remove_card(card);
812
813 err:
814 return err;
815 }
816
817 static int mmc_sdio_reinit_card(struct mmc_host *host)
818 {
819 int ret;
820
821 /*
822 * Reset the card by performing the same steps that are taken by
823 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
824 *
825 * sdio_reset() is technically not needed. Having just powered up the
826 * hardware, it should already be in reset state. However, some
827 * platforms (such as SD8686 on OLPC) do not instantly cut power,
828 * meaning that a reset is required when restoring power soon after
829 * powering off. It is harmless in other cases.
830 *
831 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
832 * is not necessary for non-removable cards. However, it is required
833 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
834 * harmless in other situations.
835 *
836 */
837
838 sdio_reset(host);
839 mmc_go_idle(host);
840 mmc_send_if_cond(host, host->card->ocr);
841
842 ret = mmc_send_io_op_cond(host, 0, NULL);
843 if (ret)
844 return ret;
845
846 return mmc_sdio_init_card(host, host->card->ocr, host->card);
847 }
848
849 /*
850 * Host is being removed. Free up the current card.
851 */
852 static void mmc_sdio_remove(struct mmc_host *host)
853 {
854 int i;
855
856 for (i = 0;i < host->card->sdio_funcs;i++) {
857 if (host->card->sdio_func[i]) {
858 sdio_remove_func(host->card->sdio_func[i]);
859 host->card->sdio_func[i] = NULL;
860 }
861 }
862
863 mmc_remove_card(host->card);
864 host->card = NULL;
865 }
866
867 /*
868 * Card detection - card is alive.
869 */
870 static int mmc_sdio_alive(struct mmc_host *host)
871 {
872 return mmc_select_card(host->card);
873 }
874
875 /*
876 * Card detection callback from host.
877 */
878 static void mmc_sdio_detect(struct mmc_host *host)
879 {
880 int err;
881
882 /* Make sure card is powered before detecting it */
883 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
884 err = pm_runtime_get_sync(&host->card->dev);
885 if (err < 0) {
886 pm_runtime_put_noidle(&host->card->dev);
887 goto out;
888 }
889 }
890
891 mmc_claim_host(host);
892
893 /*
894 * Just check if our card has been removed.
895 */
896 err = _mmc_detect_card_removed(host);
897
898 mmc_release_host(host);
899
900 /*
901 * Tell PM core it's OK to power off the card now.
902 *
903 * The _sync variant is used in order to ensure that the card
904 * is left powered off in case an error occurred, and the card
905 * is going to be removed.
906 *
907 * Since there is no specific reason to believe a new user
908 * is about to show up at this point, the _sync variant is
909 * desirable anyway.
910 */
911 if (host->caps & MMC_CAP_POWER_OFF_CARD)
912 pm_runtime_put_sync(&host->card->dev);
913
914 out:
915 if (err) {
916 mmc_sdio_remove(host);
917
918 mmc_claim_host(host);
919 mmc_detach_bus(host);
920 mmc_power_off(host);
921 mmc_release_host(host);
922 }
923 }
924
925 /*
926 * SDIO pre_suspend. We need to suspend all functions separately.
927 * Therefore all registered functions must have drivers with suspend
928 * and resume methods. Failing that we simply remove the whole card.
929 */
930 static int mmc_sdio_pre_suspend(struct mmc_host *host)
931 {
932 int i, err = 0;
933
934 for (i = 0; i < host->card->sdio_funcs; i++) {
935 struct sdio_func *func = host->card->sdio_func[i];
936 if (func && sdio_func_present(func) && func->dev.driver) {
937 const struct dev_pm_ops *pmops = func->dev.driver->pm;
938 if (!pmops || !pmops->suspend || !pmops->resume) {
939 /* force removal of entire card in that case */
940 err = -ENOSYS;
941 break;
942 }
943 }
944 }
945
946 return err;
947 }
948
949 /*
950 * SDIO suspend. Suspend all functions separately.
951 */
952 static int mmc_sdio_suspend(struct mmc_host *host)
953 {
954 /* Prevent processing of SDIO IRQs in suspended state. */
955 mmc_card_set_suspended(host->card);
956 cancel_delayed_work_sync(&host->sdio_irq_work);
957
958 mmc_claim_host(host);
959
960 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
961 sdio_disable_wide(host->card);
962
963 if (!mmc_card_keep_power(host)) {
964 mmc_power_off(host);
965 } else if (host->retune_period) {
966 mmc_retune_timer_stop(host);
967 mmc_retune_needed(host);
968 }
969
970 mmc_release_host(host);
971
972 return 0;
973 }
974
975 static int mmc_sdio_resume(struct mmc_host *host)
976 {
977 int err = 0;
978
979 /* Basic card reinitialization. */
980 mmc_claim_host(host);
981
982 /*
983 * Restore power and reinitialize the card when needed. Note that a
984 * removable card is checked from a detect work later on in the resume
985 * process.
986 */
987 if (!mmc_card_keep_power(host)) {
988 mmc_power_up(host, host->card->ocr);
989 /*
990 * Tell runtime PM core we just powered up the card,
991 * since it still believes the card is powered off.
992 * Note that currently runtime PM is only enabled
993 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
994 */
995 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
996 pm_runtime_disable(&host->card->dev);
997 pm_runtime_set_active(&host->card->dev);
998 pm_runtime_enable(&host->card->dev);
999 }
1000 err = mmc_sdio_reinit_card(host);
1001 } else if (mmc_card_wake_sdio_irq(host)) {
1002 /* We may have switched to 1-bit mode during suspend */
1003 err = sdio_enable_4bit_bus(host->card);
1004 }
1005
1006 if (err)
1007 goto out;
1008
1009 /* Allow SDIO IRQs to be processed again. */
1010 mmc_card_clr_suspended(host->card);
1011
1012 if (host->sdio_irqs) {
1013 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1014 wake_up_process(host->sdio_irq_thread);
1015 else if (host->caps & MMC_CAP_SDIO_IRQ)
1016 host->ops->enable_sdio_irq(host, 1);
1017 }
1018
1019 out:
1020 mmc_release_host(host);
1021
1022 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1023 return err;
1024 }
1025
1026 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1027 {
1028 /* No references to the card, cut the power to it. */
1029 mmc_claim_host(host);
1030 mmc_power_off(host);
1031 mmc_release_host(host);
1032
1033 return 0;
1034 }
1035
1036 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1037 {
1038 int ret;
1039
1040 /* Restore power and re-initialize. */
1041 mmc_claim_host(host);
1042 mmc_power_up(host, host->card->ocr);
1043 ret = mmc_sdio_reinit_card(host);
1044 mmc_release_host(host);
1045
1046 return ret;
1047 }
1048
1049 static int mmc_sdio_hw_reset(struct mmc_host *host)
1050 {
1051 mmc_power_cycle(host, host->card->ocr);
1052 return mmc_sdio_reinit_card(host);
1053 }
1054
1055 static int mmc_sdio_sw_reset(struct mmc_host *host)
1056 {
1057 mmc_set_clock(host, host->f_init);
1058 sdio_reset(host);
1059 mmc_go_idle(host);
1060
1061 mmc_set_initial_state(host);
1062 mmc_set_initial_signal_voltage(host);
1063
1064 return mmc_sdio_reinit_card(host);
1065 }
1066
1067 static const struct mmc_bus_ops mmc_sdio_ops = {
1068 .remove = mmc_sdio_remove,
1069 .detect = mmc_sdio_detect,
1070 .pre_suspend = mmc_sdio_pre_suspend,
1071 .suspend = mmc_sdio_suspend,
1072 .resume = mmc_sdio_resume,
1073 .runtime_suspend = mmc_sdio_runtime_suspend,
1074 .runtime_resume = mmc_sdio_runtime_resume,
1075 .alive = mmc_sdio_alive,
1076 .hw_reset = mmc_sdio_hw_reset,
1077 .sw_reset = mmc_sdio_sw_reset,
1078 };
1079
1080
1081 /*
1082 * Starting point for SDIO card init.
1083 */
1084 int mmc_attach_sdio(struct mmc_host *host)
1085 {
1086 int err, i, funcs;
1087 u32 ocr, rocr;
1088 struct mmc_card *card;
1089
1090 WARN_ON(!host->claimed);
1091
1092 err = mmc_send_io_op_cond(host, 0, &ocr);
1093 if (err)
1094 return err;
1095
1096 mmc_attach_bus(host, &mmc_sdio_ops);
1097 if (host->ocr_avail_sdio)
1098 host->ocr_avail = host->ocr_avail_sdio;
1099
1100
1101 rocr = mmc_select_voltage(host, ocr);
1102
1103 /*
1104 * Can we support the voltage(s) of the card(s)?
1105 */
1106 if (!rocr) {
1107 err = -EINVAL;
1108 goto err;
1109 }
1110
1111 /*
1112 * Detect and init the card.
1113 */
1114 err = mmc_sdio_init_card(host, rocr, NULL);
1115 if (err)
1116 goto err;
1117
1118 card = host->card;
1119
1120 /*
1121 * Enable runtime PM only if supported by host+card+board
1122 */
1123 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1124 /*
1125 * Do not allow runtime suspend until after SDIO function
1126 * devices are added.
1127 */
1128 pm_runtime_get_noresume(&card->dev);
1129
1130 /*
1131 * Let runtime PM core know our card is active
1132 */
1133 err = pm_runtime_set_active(&card->dev);
1134 if (err)
1135 goto remove;
1136
1137 /*
1138 * Enable runtime PM for this card
1139 */
1140 pm_runtime_enable(&card->dev);
1141 }
1142
1143 /*
1144 * The number of functions on the card is encoded inside
1145 * the ocr.
1146 */
1147 funcs = (ocr & 0x70000000) >> 28;
1148 card->sdio_funcs = 0;
1149
1150 /*
1151 * Initialize (but don't add) all present functions.
1152 */
1153 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1154 err = sdio_init_func(host->card, i + 1);
1155 if (err)
1156 goto remove;
1157
1158 /*
1159 * Enable Runtime PM for this func (if supported)
1160 */
1161 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1162 pm_runtime_enable(&card->sdio_func[i]->dev);
1163 }
1164
1165 /*
1166 * First add the card to the driver model...
1167 */
1168 mmc_release_host(host);
1169 err = mmc_add_card(host->card);
1170 if (err)
1171 goto remove_added;
1172
1173 /*
1174 * ...then the SDIO functions.
1175 */
1176 for (i = 0;i < funcs;i++) {
1177 err = sdio_add_func(host->card->sdio_func[i]);
1178 if (err)
1179 goto remove_added;
1180 }
1181
1182 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1183 pm_runtime_put(&card->dev);
1184
1185 mmc_claim_host(host);
1186 return 0;
1187
1188
1189 remove:
1190 mmc_release_host(host);
1191 remove_added:
1192 /*
1193 * The devices are being deleted so it is not necessary to disable
1194 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1195 * because it needs to be active to remove any function devices that
1196 * were probed, and after that it gets deleted.
1197 */
1198 mmc_sdio_remove(host);
1199 mmc_claim_host(host);
1200 err:
1201 mmc_detach_bus(host);
1202
1203 pr_err("%s: error %d whilst initialising SDIO card\n",
1204 mmc_hostname(host), err);
1205
1206 return err;
1207 }
1208
Linux with added FPC-III support