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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#include <linux/sysfs.h>
11
12#include <linux/mmc/host.h>
13#include <linux/mmc/card.h>
14#include <linux/mmc/mmc.h>
15#include <linux/mmc/sdio.h>
16#include <linux/mmc/sdio_func.h>
17#include <linux/mmc/sdio_ids.h>
18
19#include "core.h"
20#include "card.h"
21#include "host.h"
22#include "bus.h"
23#include "quirks.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
31MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
32MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
33MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
34MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
35MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
36
37#define sdio_info_attr(num) \
38static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
39{ \
40 struct mmc_card *card = mmc_dev_to_card(dev); \
41 \
42 if (num > card->num_info) \
43 return -ENODATA; \
44 if (!card->info[num - 1][0]) \
45 return 0; \
46 return sysfs_emit(buf, "%s\n", card->info[num - 1]); \
47} \
48static DEVICE_ATTR_RO(info##num)
49
50sdio_info_attr(1);
51sdio_info_attr(2);
52sdio_info_attr(3);
53sdio_info_attr(4);
54
55static struct attribute *sdio_std_attrs[] = {
56 &dev_attr_vendor.attr,
57 &dev_attr_device.attr,
58 &dev_attr_revision.attr,
59 &dev_attr_info1.attr,
60 &dev_attr_info2.attr,
61 &dev_attr_info3.attr,
62 &dev_attr_info4.attr,
63 &dev_attr_ocr.attr,
64 &dev_attr_rca.attr,
65 NULL,
66};
67ATTRIBUTE_GROUPS(sdio_std);
68
69static const struct device_type sdio_type = {
70 .groups = sdio_std_groups,
71};
72
73static int sdio_read_fbr(struct sdio_func *func)
74{
75 int ret;
76 unsigned char data;
77
78 if (mmc_card_nonstd_func_interface(func->card)) {
79 func->class = SDIO_CLASS_NONE;
80 return 0;
81 }
82
83 ret = mmc_io_rw_direct(func->card, 0, 0,
84 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
85 if (ret)
86 goto out;
87
88 data &= 0x0f;
89
90 if (data == 0x0f) {
91 ret = mmc_io_rw_direct(func->card, 0, 0,
92 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
93 if (ret)
94 goto out;
95 }
96
97 func->class = data;
98
99out:
100 return ret;
101}
102
103static int sdio_init_func(struct mmc_card *card, unsigned int fn)
104{
105 int ret;
106 struct sdio_func *func;
107
108 if (WARN_ON(fn > SDIO_MAX_FUNCS))
109 return -EINVAL;
110
111 func = sdio_alloc_func(card);
112 if (IS_ERR(func))
113 return PTR_ERR(func);
114
115 func->num = fn;
116
117 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
118 ret = sdio_read_fbr(func);
119 if (ret)
120 goto fail;
121
122 ret = sdio_read_func_cis(func);
123 if (ret)
124 goto fail;
125 } else {
126 func->vendor = func->card->cis.vendor;
127 func->device = func->card->cis.device;
128 func->max_blksize = func->card->cis.blksize;
129 }
130
131 card->sdio_func[fn - 1] = func;
132
133 return 0;
134
135fail:
136 /*
137 * It is okay to remove the function here even though we hold
138 * the host lock as we haven't registered the device yet.
139 */
140 sdio_remove_func(func);
141 return ret;
142}
143
144static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
145{
146 int ret;
147 int cccr_vsn;
148 int uhs = ocr & R4_18V_PRESENT;
149 unsigned char data;
150 unsigned char speed;
151
152 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
153 if (ret)
154 goto out;
155
156 cccr_vsn = data & 0x0f;
157
158 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
159 pr_err("%s: unrecognised CCCR structure version %d\n",
160 mmc_hostname(card->host), cccr_vsn);
161 return -EINVAL;
162 }
163
164 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
165
166 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
167 if (ret)
168 goto out;
169
170 if (data & SDIO_CCCR_CAP_SMB)
171 card->cccr.multi_block = 1;
172 if (data & SDIO_CCCR_CAP_LSC)
173 card->cccr.low_speed = 1;
174 if (data & SDIO_CCCR_CAP_4BLS)
175 card->cccr.wide_bus = 1;
176
177 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
178 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
179 if (ret)
180 goto out;
181
182 if (data & SDIO_POWER_SMPC)
183 card->cccr.high_power = 1;
184 }
185
186 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
187 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
188 if (ret)
189 goto out;
190
191 card->scr.sda_spec3 = 0;
192 card->sw_caps.sd3_bus_mode = 0;
193 card->sw_caps.sd3_drv_type = 0;
194 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
195 card->scr.sda_spec3 = 1;
196 ret = mmc_io_rw_direct(card, 0, 0,
197 SDIO_CCCR_UHS, 0, &data);
198 if (ret)
199 goto out;
200
201 if (mmc_host_uhs(card->host)) {
202 if (data & SDIO_UHS_DDR50)
203 card->sw_caps.sd3_bus_mode
204 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
205 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
206
207 if (data & SDIO_UHS_SDR50)
208 card->sw_caps.sd3_bus_mode
209 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
210 | SD_MODE_UHS_SDR12;
211
212 if (data & SDIO_UHS_SDR104)
213 card->sw_caps.sd3_bus_mode
214 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
215 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
216 }
217
218 ret = mmc_io_rw_direct(card, 0, 0,
219 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
220 if (ret)
221 goto out;
222
223 if (data & SDIO_DRIVE_SDTA)
224 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
225 if (data & SDIO_DRIVE_SDTC)
226 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
227 if (data & SDIO_DRIVE_SDTD)
228 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
229
230 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTERRUPT_EXT, 0, &data);
231 if (ret)
232 goto out;
233
234 if (data & SDIO_INTERRUPT_EXT_SAI) {
235 data |= SDIO_INTERRUPT_EXT_EAI;
236 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT,
237 data, NULL);
238 if (ret)
239 goto out;
240
241 card->cccr.enable_async_irq = 1;
242 }
243 }
244
245 /* if no uhs mode ensure we check for high speed */
246 if (!card->sw_caps.sd3_bus_mode) {
247 if (speed & SDIO_SPEED_SHS) {
248 card->cccr.high_speed = 1;
249 card->sw_caps.hs_max_dtr = 50000000;
250 } else {
251 card->cccr.high_speed = 0;
252 card->sw_caps.hs_max_dtr = 25000000;
253 }
254 }
255 }
256
257out:
258 return ret;
259}
260
261static int sdio_enable_wide(struct mmc_card *card)
262{
263 int ret;
264 u8 ctrl;
265
266 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
267 return 0;
268
269 if (card->cccr.low_speed && !card->cccr.wide_bus)
270 return 0;
271
272 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
273 if (ret)
274 return ret;
275
276 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
277 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
278 mmc_hostname(card->host), ctrl);
279
280 /* set as 4-bit bus width */
281 ctrl &= ~SDIO_BUS_WIDTH_MASK;
282 ctrl |= SDIO_BUS_WIDTH_4BIT;
283
284 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
285 if (ret)
286 return ret;
287
288 return 1;
289}
290
291/*
292 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
293 * of the card. This may be required on certain setups of boards,
294 * controllers and embedded sdio device which do not need the card's
295 * pull-up. As a result, card detection is disabled and power is saved.
296 */
297static int sdio_disable_cd(struct mmc_card *card)
298{
299 int ret;
300 u8 ctrl;
301
302 if (!mmc_card_disable_cd(card))
303 return 0;
304
305 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
306 if (ret)
307 return ret;
308
309 ctrl |= SDIO_BUS_CD_DISABLE;
310
311 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
312}
313
314/*
315 * Devices that remain active during a system suspend are
316 * put back into 1-bit mode.
317 */
318static int sdio_disable_wide(struct mmc_card *card)
319{
320 int ret;
321 u8 ctrl;
322
323 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
324 return 0;
325
326 if (card->cccr.low_speed && !card->cccr.wide_bus)
327 return 0;
328
329 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
330 if (ret)
331 return ret;
332
333 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
334 return 0;
335
336 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
337 ctrl |= SDIO_BUS_ASYNC_INT;
338
339 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
340 if (ret)
341 return ret;
342
343 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
344
345 return 0;
346}
347
348static int sdio_disable_4bit_bus(struct mmc_card *card)
349{
350 int err;
351
352 if (mmc_card_sdio(card))
353 goto out;
354
355 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
356 return 0;
357
358 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
359 return 0;
360
361 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
362 if (err)
363 return err;
364
365out:
366 return sdio_disable_wide(card);
367}
368
369
370static int sdio_enable_4bit_bus(struct mmc_card *card)
371{
372 int err;
373
374 err = sdio_enable_wide(card);
375 if (err <= 0)
376 return err;
377 if (mmc_card_sdio(card))
378 goto out;
379
380 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
381 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
382 if (err) {
383 sdio_disable_wide(card);
384 return err;
385 }
386 }
387out:
388 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
389
390 return 0;
391}
392
393
394/*
395 * Test if the card supports high-speed mode and, if so, switch to it.
396 */
397static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
398{
399 int ret;
400 u8 speed;
401
402 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
403 return 0;
404
405 if (!card->cccr.high_speed)
406 return 0;
407
408 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
409 if (ret)
410 return ret;
411
412 if (enable)
413 speed |= SDIO_SPEED_EHS;
414 else
415 speed &= ~SDIO_SPEED_EHS;
416
417 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
418 if (ret)
419 return ret;
420
421 return 1;
422}
423
424/*
425 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
426 */
427static int sdio_enable_hs(struct mmc_card *card)
428{
429 int ret;
430
431 ret = mmc_sdio_switch_hs(card, true);
432 if (ret <= 0 || mmc_card_sdio(card))
433 return ret;
434
435 ret = mmc_sd_switch_hs(card);
436 if (ret <= 0)
437 mmc_sdio_switch_hs(card, false);
438
439 return ret;
440}
441
442static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
443{
444 unsigned max_dtr;
445
446 if (mmc_card_hs(card)) {
447 /*
448 * The SDIO specification doesn't mention how
449 * the CIS transfer speed register relates to
450 * high-speed, but it seems that 50 MHz is
451 * mandatory.
452 */
453 max_dtr = 50000000;
454 } else {
455 max_dtr = card->cis.max_dtr;
456 }
457
458 if (mmc_card_sd_combo(card))
459 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
460
461 max_dtr = min_not_zero(max_dtr, card->quirk_max_rate);
462
463 return max_dtr;
464}
465
466static unsigned char host_drive_to_sdio_drive(int host_strength)
467{
468 switch (host_strength) {
469 case MMC_SET_DRIVER_TYPE_A:
470 return SDIO_DTSx_SET_TYPE_A;
471 case MMC_SET_DRIVER_TYPE_B:
472 return SDIO_DTSx_SET_TYPE_B;
473 case MMC_SET_DRIVER_TYPE_C:
474 return SDIO_DTSx_SET_TYPE_C;
475 case MMC_SET_DRIVER_TYPE_D:
476 return SDIO_DTSx_SET_TYPE_D;
477 default:
478 return SDIO_DTSx_SET_TYPE_B;
479 }
480}
481
482static void sdio_select_driver_type(struct mmc_card *card)
483{
484 int card_drv_type, drive_strength, drv_type;
485 unsigned char card_strength;
486 int err;
487
488 card->drive_strength = 0;
489
490 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
491
492 drive_strength = mmc_select_drive_strength(card,
493 card->sw_caps.uhs_max_dtr,
494 card_drv_type, &drv_type);
495
496 if (drive_strength) {
497 /* if error just use default for drive strength B */
498 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
499 &card_strength);
500 if (err)
501 return;
502
503 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
504 card_strength |= host_drive_to_sdio_drive(drive_strength);
505
506 /* if error default to drive strength B */
507 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
508 card_strength, NULL);
509 if (err)
510 return;
511 card->drive_strength = drive_strength;
512 }
513
514 if (drv_type)
515 mmc_set_driver_type(card->host, drv_type);
516}
517
518
519static int sdio_set_bus_speed_mode(struct mmc_card *card)
520{
521 unsigned int bus_speed, timing;
522 int err;
523 unsigned char speed;
524 unsigned int max_rate;
525
526 /*
527 * If the host doesn't support any of the UHS-I modes, fallback on
528 * default speed.
529 */
530 if (!mmc_host_uhs(card->host))
531 return 0;
532
533 bus_speed = SDIO_SPEED_SDR12;
534 timing = MMC_TIMING_UHS_SDR12;
535 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
536 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
537 bus_speed = SDIO_SPEED_SDR104;
538 timing = MMC_TIMING_UHS_SDR104;
539 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
540 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
541 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
542 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
543 bus_speed = SDIO_SPEED_DDR50;
544 timing = MMC_TIMING_UHS_DDR50;
545 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
546 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
547 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
548 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
549 SD_MODE_UHS_SDR50)) {
550 bus_speed = SDIO_SPEED_SDR50;
551 timing = MMC_TIMING_UHS_SDR50;
552 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
553 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
554 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
555 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
556 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
557 bus_speed = SDIO_SPEED_SDR25;
558 timing = MMC_TIMING_UHS_SDR25;
559 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
560 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
561 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
562 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
563 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
564 SD_MODE_UHS_SDR12)) {
565 bus_speed = SDIO_SPEED_SDR12;
566 timing = MMC_TIMING_UHS_SDR12;
567 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
568 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
569 }
570
571 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
572 if (err)
573 return err;
574
575 speed &= ~SDIO_SPEED_BSS_MASK;
576 speed |= bus_speed;
577 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
578 if (err)
579 return err;
580
581 max_rate = min_not_zero(card->quirk_max_rate,
582 card->sw_caps.uhs_max_dtr);
583
584 mmc_set_timing(card->host, timing);
585 mmc_set_clock(card->host, max_rate);
586
587 return 0;
588}
589
590/*
591 * UHS-I specific initialization procedure
592 */
593static int mmc_sdio_init_uhs_card(struct mmc_card *card)
594{
595 int err;
596
597 if (!card->scr.sda_spec3)
598 return 0;
599
600 /* Switch to wider bus */
601 err = sdio_enable_4bit_bus(card);
602 if (err)
603 goto out;
604
605 /* Set the driver strength for the card */
606 sdio_select_driver_type(card);
607
608 /* Set bus speed mode of the card */
609 err = sdio_set_bus_speed_mode(card);
610 if (err)
611 goto out;
612
613 /*
614 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
615 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
616 */
617 if (!mmc_host_is_spi(card->host) &&
618 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
619 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
620 err = mmc_execute_tuning(card);
621out:
622 return err;
623}
624
625static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
626 struct mmc_card *card)
627{
628 if (card)
629 mmc_remove_card(card);
630
631 /*
632 * Reset the card by performing the same steps that are taken by
633 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
634 *
635 * sdio_reset() is technically not needed. Having just powered up the
636 * hardware, it should already be in reset state. However, some
637 * platforms (such as SD8686 on OLPC) do not instantly cut power,
638 * meaning that a reset is required when restoring power soon after
639 * powering off. It is harmless in other cases.
640 *
641 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
642 * is not necessary for non-removable cards. However, it is required
643 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
644 * harmless in other situations.
645 *
646 */
647
648 sdio_reset(host);
649 mmc_go_idle(host);
650 mmc_send_if_cond(host, ocr);
651 return mmc_send_io_op_cond(host, 0, NULL);
652}
653
654/*
655 * Handle the detection and initialisation of a card.
656 *
657 * In the case of a resume, "oldcard" will contain the card
658 * we're trying to reinitialise.
659 */
660static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
661 struct mmc_card *oldcard)
662{
663 struct mmc_card *card;
664 int err;
665 int retries = 10;
666 u32 rocr = 0;
667 u32 ocr_card = ocr;
668
669 WARN_ON(!host->claimed);
670
671 /* to query card if 1.8V signalling is supported */
672 if (mmc_host_uhs(host))
673 ocr |= R4_18V_PRESENT;
674
675try_again:
676 if (!retries) {
677 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
678 ocr &= ~R4_18V_PRESENT;
679 }
680
681 /*
682 * Inform the card of the voltage
683 */
684 err = mmc_send_io_op_cond(host, ocr, &rocr);
685 if (err)
686 return err;
687
688 /*
689 * For SPI, enable CRC as appropriate.
690 */
691 if (mmc_host_is_spi(host)) {
692 err = mmc_spi_set_crc(host, use_spi_crc);
693 if (err)
694 return err;
695 }
696
697 /*
698 * Allocate card structure.
699 */
700 card = mmc_alloc_card(host, &sdio_type);
701 if (IS_ERR(card))
702 return PTR_ERR(card);
703
704 if ((rocr & R4_MEMORY_PRESENT) &&
705 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
706 card->type = MMC_TYPE_SD_COMBO;
707
708 if (oldcard && (!mmc_card_sd_combo(oldcard) ||
709 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
710 err = -ENOENT;
711 goto mismatch;
712 }
713 } else {
714 card->type = MMC_TYPE_SDIO;
715
716 if (oldcard && !mmc_card_sdio(oldcard)) {
717 err = -ENOENT;
718 goto mismatch;
719 }
720 }
721
722 /*
723 * Call the optional HC's init_card function to handle quirks.
724 */
725 if (host->ops->init_card)
726 host->ops->init_card(host, card);
727 mmc_fixup_device(card, sdio_card_init_methods);
728
729 card->ocr = ocr_card;
730
731 /*
732 * If the host and card support UHS-I mode request the card
733 * to switch to 1.8V signaling level. No 1.8v signalling if
734 * UHS mode is not enabled to maintain compatibility and some
735 * systems that claim 1.8v signalling in fact do not support
736 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
737 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
738 * fails to check rocr & R4_18V_PRESENT, but we still need to
739 * try to init uhs card. sdio_read_cccr will take over this task
740 * to make sure which speed mode should work.
741 */
742 if (rocr & ocr & R4_18V_PRESENT) {
743 err = mmc_set_uhs_voltage(host, ocr_card);
744 if (err == -EAGAIN) {
745 mmc_sdio_pre_init(host, ocr_card, card);
746 retries--;
747 goto try_again;
748 } else if (err) {
749 ocr &= ~R4_18V_PRESENT;
750 }
751 }
752
753 /*
754 * For native busses: set card RCA and quit open drain mode.
755 */
756 if (!mmc_host_is_spi(host)) {
757 err = mmc_send_relative_addr(host, &card->rca);
758 if (err)
759 goto remove;
760
761 /*
762 * Update oldcard with the new RCA received from the SDIO
763 * device -- we're doing this so that it's updated in the
764 * "card" struct when oldcard overwrites that later.
765 */
766 if (oldcard)
767 oldcard->rca = card->rca;
768 }
769
770 /*
771 * Read CSD, before selecting the card
772 */
773 if (!oldcard && mmc_card_sd_combo(card)) {
774 err = mmc_sd_get_csd(card, false);
775 if (err)
776 goto remove;
777
778 mmc_decode_cid(card);
779 }
780
781 /*
782 * Select card, as all following commands rely on that.
783 */
784 if (!mmc_host_is_spi(host)) {
785 err = mmc_select_card(card);
786 if (err)
787 goto remove;
788 }
789
790 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
791 /*
792 * This is non-standard SDIO device, meaning it doesn't
793 * have any CIA (Common I/O area) registers present.
794 * It's host's responsibility to fill cccr and cis
795 * structures in init_card().
796 */
797 mmc_set_clock(host, card->cis.max_dtr);
798
799 if (card->cccr.high_speed) {
800 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
801 }
802
803 if (oldcard)
804 mmc_remove_card(card);
805 else
806 host->card = card;
807
808 return 0;
809 }
810
811 /*
812 * Read the common registers. Note that we should try to
813 * validate whether UHS would work or not.
814 */
815 err = sdio_read_cccr(card, ocr);
816 if (err) {
817 mmc_sdio_pre_init(host, ocr_card, card);
818 if (ocr & R4_18V_PRESENT) {
819 /* Retry init sequence, but without R4_18V_PRESENT. */
820 retries = 0;
821 goto try_again;
822 }
823 return err;
824 }
825
826 /*
827 * Read the common CIS tuples.
828 */
829 err = sdio_read_common_cis(card);
830 if (err)
831 goto remove;
832
833 if (oldcard) {
834 if (card->cis.vendor == oldcard->cis.vendor &&
835 card->cis.device == oldcard->cis.device) {
836 mmc_remove_card(card);
837 card = oldcard;
838 } else {
839 err = -ENOENT;
840 goto mismatch;
841 }
842 }
843
844 mmc_fixup_device(card, sdio_fixup_methods);
845
846 if (mmc_card_sd_combo(card)) {
847 err = mmc_sd_setup_card(host, card, oldcard != NULL);
848 /* handle as SDIO-only card if memory init failed */
849 if (err) {
850 mmc_go_idle(host);
851 if (mmc_host_is_spi(host))
852 /* should not fail, as it worked previously */
853 mmc_spi_set_crc(host, use_spi_crc);
854 card->type = MMC_TYPE_SDIO;
855 } else
856 card->dev.type = &sd_type;
857 }
858
859 /*
860 * If needed, disconnect card detection pull-up resistor.
861 */
862 err = sdio_disable_cd(card);
863 if (err)
864 goto remove;
865
866 /* Initialization sequence for UHS-I cards */
867 /* Only if card supports 1.8v and UHS signaling */
868 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
869 err = mmc_sdio_init_uhs_card(card);
870 if (err)
871 goto remove;
872 } else {
873 /*
874 * Switch to high-speed (if supported).
875 */
876 err = sdio_enable_hs(card);
877 if (err > 0)
878 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
879 else if (err)
880 goto remove;
881
882 /*
883 * Change to the card's maximum speed.
884 */
885 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
886
887 /*
888 * Switch to wider bus (if supported).
889 */
890 err = sdio_enable_4bit_bus(card);
891 if (err)
892 goto remove;
893 }
894
895 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
896 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
897 pr_err("%s: Host failed to negotiate down from 3.3V\n",
898 mmc_hostname(host));
899 err = -EINVAL;
900 goto remove;
901 }
902
903 host->card = card;
904 return 0;
905
906mismatch:
907 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
908remove:
909 if (oldcard != card)
910 mmc_remove_card(card);
911 return err;
912}
913
914static int mmc_sdio_reinit_card(struct mmc_host *host)
915{
916 int ret;
917
918 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
919 if (ret)
920 return ret;
921
922 return mmc_sdio_init_card(host, host->card->ocr, host->card);
923}
924
925/*
926 * Host is being removed. Free up the current card.
927 */
928static void mmc_sdio_remove(struct mmc_host *host)
929{
930 int i;
931
932 for (i = 0;i < host->card->sdio_funcs;i++) {
933 if (host->card->sdio_func[i]) {
934 sdio_remove_func(host->card->sdio_func[i]);
935 host->card->sdio_func[i] = NULL;
936 }
937 }
938
939 mmc_remove_card(host->card);
940 host->card = NULL;
941}
942
943/*
944 * Card detection - card is alive.
945 */
946static int mmc_sdio_alive(struct mmc_host *host)
947{
948 return mmc_select_card(host->card);
949}
950
951/*
952 * Card detection callback from host.
953 */
954static void mmc_sdio_detect(struct mmc_host *host)
955{
956 int err;
957
958 /* Make sure card is powered before detecting it */
959 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
960 err = pm_runtime_resume_and_get(&host->card->dev);
961 if (err < 0)
962 goto out;
963 }
964
965 mmc_claim_host(host);
966
967 /*
968 * Just check if our card has been removed.
969 */
970 err = _mmc_detect_card_removed(host);
971
972 mmc_release_host(host);
973
974 /*
975 * Tell PM core it's OK to power off the card now.
976 *
977 * The _sync variant is used in order to ensure that the card
978 * is left powered off in case an error occurred, and the card
979 * is going to be removed.
980 *
981 * Since there is no specific reason to believe a new user
982 * is about to show up at this point, the _sync variant is
983 * desirable anyway.
984 */
985 if (host->caps & MMC_CAP_POWER_OFF_CARD)
986 pm_runtime_put_sync(&host->card->dev);
987
988out:
989 if (err) {
990 mmc_sdio_remove(host);
991
992 mmc_claim_host(host);
993 mmc_detach_bus(host);
994 mmc_power_off(host);
995 mmc_release_host(host);
996 }
997}
998
999/*
1000 * SDIO pre_suspend. We need to suspend all functions separately.
1001 * Therefore all registered functions must have drivers with suspend
1002 * and resume methods. Failing that we simply remove the whole card.
1003 */
1004static int mmc_sdio_pre_suspend(struct mmc_host *host)
1005{
1006 int i;
1007
1008 for (i = 0; i < host->card->sdio_funcs; i++) {
1009 struct sdio_func *func = host->card->sdio_func[i];
1010 if (func && sdio_func_present(func) && func->dev.driver) {
1011 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1012 if (!pmops || !pmops->suspend || !pmops->resume)
1013 /* force removal of entire card in that case */
1014 goto remove;
1015 }
1016 }
1017
1018 return 0;
1019
1020remove:
1021 if (!mmc_card_is_removable(host)) {
1022 dev_warn(mmc_dev(host),
1023 "missing suspend/resume ops for non-removable SDIO card\n");
1024 /* Don't remove a non-removable card - we can't re-detect it. */
1025 return 0;
1026 }
1027
1028 /* Remove the SDIO card and let it be re-detected later on. */
1029 mmc_sdio_remove(host);
1030 mmc_claim_host(host);
1031 mmc_detach_bus(host);
1032 mmc_power_off(host);
1033 mmc_release_host(host);
1034 host->pm_flags = 0;
1035
1036 return 0;
1037}
1038
1039/*
1040 * SDIO suspend. Suspend all functions separately.
1041 */
1042static int mmc_sdio_suspend(struct mmc_host *host)
1043{
1044 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
1045
1046 /* Prevent processing of SDIO IRQs in suspended state. */
1047 mmc_card_set_suspended(host->card);
1048 cancel_work_sync(&host->sdio_irq_work);
1049
1050 mmc_claim_host(host);
1051
1052 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
1053 sdio_disable_4bit_bus(host->card);
1054
1055 if (!mmc_card_keep_power(host)) {
1056 mmc_power_off(host);
1057 } else if (host->retune_period) {
1058 mmc_retune_timer_stop(host);
1059 mmc_retune_needed(host);
1060 }
1061
1062 mmc_release_host(host);
1063
1064 return 0;
1065}
1066
1067static int mmc_sdio_resume(struct mmc_host *host)
1068{
1069 int err = 0;
1070
1071 /* Basic card reinitialization. */
1072 mmc_claim_host(host);
1073
1074 /*
1075 * Restore power and reinitialize the card when needed. Note that a
1076 * removable card is checked from a detect work later on in the resume
1077 * process.
1078 */
1079 if (!mmc_card_keep_power(host)) {
1080 mmc_power_up(host, host->card->ocr);
1081 /*
1082 * Tell runtime PM core we just powered up the card,
1083 * since it still believes the card is powered off.
1084 * Note that currently runtime PM is only enabled
1085 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1086 */
1087 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1088 pm_runtime_disable(&host->card->dev);
1089 pm_runtime_set_active(&host->card->dev);
1090 pm_runtime_enable(&host->card->dev);
1091 }
1092 err = mmc_sdio_reinit_card(host);
1093 } else if (mmc_card_wake_sdio_irq(host)) {
1094 /*
1095 * We may have switched to 1-bit mode during suspend,
1096 * need to hold retuning, because tuning only supprt
1097 * 4-bit mode or 8 bit mode.
1098 */
1099 mmc_retune_hold_now(host);
1100 err = sdio_enable_4bit_bus(host->card);
1101 mmc_retune_release(host);
1102 }
1103
1104 if (err)
1105 goto out;
1106
1107 /* Allow SDIO IRQs to be processed again. */
1108 mmc_card_clr_suspended(host->card);
1109
1110 if (host->sdio_irqs) {
1111 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1112 wake_up_process(host->sdio_irq_thread);
1113 else if (host->caps & MMC_CAP_SDIO_IRQ)
1114 schedule_work(&host->sdio_irq_work);
1115 }
1116
1117out:
1118 mmc_release_host(host);
1119
1120 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1121 return err;
1122}
1123
1124static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1125{
1126 /* No references to the card, cut the power to it. */
1127 mmc_claim_host(host);
1128 mmc_power_off(host);
1129 mmc_release_host(host);
1130
1131 return 0;
1132}
1133
1134static int mmc_sdio_runtime_resume(struct mmc_host *host)
1135{
1136 int ret;
1137
1138 /* Restore power and re-initialize. */
1139 mmc_claim_host(host);
1140 mmc_power_up(host, host->card->ocr);
1141 ret = mmc_sdio_reinit_card(host);
1142 mmc_release_host(host);
1143
1144 return ret;
1145}
1146
1147/*
1148 * SDIO HW reset
1149 *
1150 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1151 * reset was asynchronously scheduled, else a negative error code.
1152 */
1153static int mmc_sdio_hw_reset(struct mmc_host *host)
1154{
1155 struct mmc_card *card = host->card;
1156
1157 /*
1158 * In case the card is shared among multiple func drivers, reset the
1159 * card through a rescan work. In this way it will be removed and
1160 * re-detected, thus all func drivers becomes informed about it.
1161 */
1162 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1163 if (mmc_card_removed(card))
1164 return 1;
1165 host->rescan_entered = 0;
1166 mmc_card_set_removed(card);
1167 _mmc_detect_change(host, 0, false);
1168 return 1;
1169 }
1170
1171 /*
1172 * A single func driver has been probed, then let's skip the heavy
1173 * hotplug dance above and execute the reset immediately.
1174 */
1175 mmc_power_cycle(host, card->ocr);
1176 return mmc_sdio_reinit_card(host);
1177}
1178
1179static int mmc_sdio_sw_reset(struct mmc_host *host)
1180{
1181 mmc_set_clock(host, host->f_init);
1182 sdio_reset(host);
1183 mmc_go_idle(host);
1184
1185 mmc_set_initial_state(host);
1186 mmc_set_initial_signal_voltage(host);
1187
1188 return mmc_sdio_reinit_card(host);
1189}
1190
1191static const struct mmc_bus_ops mmc_sdio_ops = {
1192 .remove = mmc_sdio_remove,
1193 .detect = mmc_sdio_detect,
1194 .pre_suspend = mmc_sdio_pre_suspend,
1195 .suspend = mmc_sdio_suspend,
1196 .resume = mmc_sdio_resume,
1197 .runtime_suspend = mmc_sdio_runtime_suspend,
1198 .runtime_resume = mmc_sdio_runtime_resume,
1199 .alive = mmc_sdio_alive,
1200 .hw_reset = mmc_sdio_hw_reset,
1201 .sw_reset = mmc_sdio_sw_reset,
1202};
1203
1204
1205/*
1206 * Starting point for SDIO card init.
1207 */
1208int mmc_attach_sdio(struct mmc_host *host)
1209{
1210 int err, i, funcs;
1211 u32 ocr, rocr;
1212 struct mmc_card *card;
1213
1214 WARN_ON(!host->claimed);
1215
1216 err = mmc_send_io_op_cond(host, 0, &ocr);
1217 if (err)
1218 return err;
1219
1220 mmc_attach_bus(host, &mmc_sdio_ops);
1221 if (host->ocr_avail_sdio)
1222 host->ocr_avail = host->ocr_avail_sdio;
1223
1224
1225 rocr = mmc_select_voltage(host, ocr);
1226
1227 /*
1228 * Can we support the voltage(s) of the card(s)?
1229 */
1230 if (!rocr) {
1231 err = -EINVAL;
1232 goto err;
1233 }
1234
1235 /*
1236 * Detect and init the card.
1237 */
1238 err = mmc_sdio_init_card(host, rocr, NULL);
1239 if (err)
1240 goto err;
1241
1242 card = host->card;
1243
1244 /*
1245 * Enable runtime PM only if supported by host+card+board
1246 */
1247 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1248 /*
1249 * Do not allow runtime suspend until after SDIO function
1250 * devices are added.
1251 */
1252 pm_runtime_get_noresume(&card->dev);
1253
1254 /*
1255 * Let runtime PM core know our card is active
1256 */
1257 err = pm_runtime_set_active(&card->dev);
1258 if (err)
1259 goto remove;
1260
1261 /*
1262 * Enable runtime PM for this card
1263 */
1264 pm_runtime_enable(&card->dev);
1265 }
1266
1267 /*
1268 * The number of functions on the card is encoded inside
1269 * the ocr.
1270 */
1271 funcs = (ocr & 0x70000000) >> 28;
1272 card->sdio_funcs = 0;
1273
1274 /*
1275 * Initialize (but don't add) all present functions.
1276 */
1277 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1278 err = sdio_init_func(host->card, i + 1);
1279 if (err)
1280 goto remove;
1281
1282 /*
1283 * Enable Runtime PM for this func (if supported)
1284 */
1285 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1286 pm_runtime_enable(&card->sdio_func[i]->dev);
1287 }
1288
1289 /*
1290 * First add the card to the driver model...
1291 */
1292 mmc_release_host(host);
1293 err = mmc_add_card(host->card);
1294 if (err)
1295 goto remove_added;
1296
1297 /*
1298 * ...then the SDIO functions.
1299 */
1300 for (i = 0;i < funcs;i++) {
1301 err = sdio_add_func(host->card->sdio_func[i]);
1302 if (err)
1303 goto remove_added;
1304 }
1305
1306 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1307 pm_runtime_put(&card->dev);
1308
1309 mmc_claim_host(host);
1310 return 0;
1311
1312
1313remove:
1314 mmc_release_host(host);
1315remove_added:
1316 /*
1317 * The devices are being deleted so it is not necessary to disable
1318 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1319 * because it needs to be active to remove any function devices that
1320 * were probed, and after that it gets deleted.
1321 */
1322 mmc_sdio_remove(host);
1323 mmc_claim_host(host);
1324err:
1325 mmc_detach_bus(host);
1326
1327 pr_err("%s: error %d whilst initialising SDIO card\n",
1328 mmc_hostname(host), err);
1329
1330 return err;
1331}
1332
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 "card.h"
24#include "host.h"
25#include "bus.h"
26#include "quirks.h"
27#include "sd.h"
28#include "sdio_bus.h"
29#include "mmc_ops.h"
30#include "sd_ops.h"
31#include "sdio_ops.h"
32#include "sdio_cis.h"
33
34static int sdio_read_fbr(struct sdio_func *func)
35{
36 int ret;
37 unsigned char data;
38
39 if (mmc_card_nonstd_func_interface(func->card)) {
40 func->class = SDIO_CLASS_NONE;
41 return 0;
42 }
43
44 ret = mmc_io_rw_direct(func->card, 0, 0,
45 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
46 if (ret)
47 goto out;
48
49 data &= 0x0f;
50
51 if (data == 0x0f) {
52 ret = mmc_io_rw_direct(func->card, 0, 0,
53 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
54 if (ret)
55 goto out;
56 }
57
58 func->class = data;
59
60out:
61 return ret;
62}
63
64static int sdio_init_func(struct mmc_card *card, unsigned int fn)
65{
66 int ret;
67 struct sdio_func *func;
68
69 if (WARN_ON(fn > SDIO_MAX_FUNCS))
70 return -EINVAL;
71
72 func = sdio_alloc_func(card);
73 if (IS_ERR(func))
74 return PTR_ERR(func);
75
76 func->num = fn;
77
78 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
79 ret = sdio_read_fbr(func);
80 if (ret)
81 goto fail;
82
83 ret = sdio_read_func_cis(func);
84 if (ret)
85 goto fail;
86 } else {
87 func->vendor = func->card->cis.vendor;
88 func->device = func->card->cis.device;
89 func->max_blksize = func->card->cis.blksize;
90 }
91
92 card->sdio_func[fn - 1] = func;
93
94 return 0;
95
96fail:
97 /*
98 * It is okay to remove the function here even though we hold
99 * the host lock as we haven't registered the device yet.
100 */
101 sdio_remove_func(func);
102 return ret;
103}
104
105static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
106{
107 int ret;
108 int cccr_vsn;
109 int uhs = ocr & R4_18V_PRESENT;
110 unsigned char data;
111 unsigned char speed;
112
113 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
114 if (ret)
115 goto out;
116
117 cccr_vsn = data & 0x0f;
118
119 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
120 pr_err("%s: unrecognised CCCR structure version %d\n",
121 mmc_hostname(card->host), cccr_vsn);
122 return -EINVAL;
123 }
124
125 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
126
127 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
128 if (ret)
129 goto out;
130
131 if (data & SDIO_CCCR_CAP_SMB)
132 card->cccr.multi_block = 1;
133 if (data & SDIO_CCCR_CAP_LSC)
134 card->cccr.low_speed = 1;
135 if (data & SDIO_CCCR_CAP_4BLS)
136 card->cccr.wide_bus = 1;
137
138 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
139 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
140 if (ret)
141 goto out;
142
143 if (data & SDIO_POWER_SMPC)
144 card->cccr.high_power = 1;
145 }
146
147 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
148 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
149 if (ret)
150 goto out;
151
152 card->scr.sda_spec3 = 0;
153 card->sw_caps.sd3_bus_mode = 0;
154 card->sw_caps.sd3_drv_type = 0;
155 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
156 card->scr.sda_spec3 = 1;
157 ret = mmc_io_rw_direct(card, 0, 0,
158 SDIO_CCCR_UHS, 0, &data);
159 if (ret)
160 goto out;
161
162 if (mmc_host_uhs(card->host)) {
163 if (data & SDIO_UHS_DDR50)
164 card->sw_caps.sd3_bus_mode
165 |= SD_MODE_UHS_DDR50;
166
167 if (data & SDIO_UHS_SDR50)
168 card->sw_caps.sd3_bus_mode
169 |= SD_MODE_UHS_SDR50;
170
171 if (data & SDIO_UHS_SDR104)
172 card->sw_caps.sd3_bus_mode
173 |= SD_MODE_UHS_SDR104;
174 }
175
176 ret = mmc_io_rw_direct(card, 0, 0,
177 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
178 if (ret)
179 goto out;
180
181 if (data & SDIO_DRIVE_SDTA)
182 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
183 if (data & SDIO_DRIVE_SDTC)
184 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
185 if (data & SDIO_DRIVE_SDTD)
186 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
187 }
188
189 /* if no uhs mode ensure we check for high speed */
190 if (!card->sw_caps.sd3_bus_mode) {
191 if (speed & SDIO_SPEED_SHS) {
192 card->cccr.high_speed = 1;
193 card->sw_caps.hs_max_dtr = 50000000;
194 } else {
195 card->cccr.high_speed = 0;
196 card->sw_caps.hs_max_dtr = 25000000;
197 }
198 }
199 }
200
201out:
202 return ret;
203}
204
205static int sdio_enable_wide(struct mmc_card *card)
206{
207 int ret;
208 u8 ctrl;
209
210 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
211 return 0;
212
213 if (card->cccr.low_speed && !card->cccr.wide_bus)
214 return 0;
215
216 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
217 if (ret)
218 return ret;
219
220 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
221 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
222 mmc_hostname(card->host), ctrl);
223
224 /* set as 4-bit bus width */
225 ctrl &= ~SDIO_BUS_WIDTH_MASK;
226 ctrl |= SDIO_BUS_WIDTH_4BIT;
227
228 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
229 if (ret)
230 return ret;
231
232 return 1;
233}
234
235/*
236 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
237 * of the card. This may be required on certain setups of boards,
238 * controllers and embedded sdio device which do not need the card's
239 * pull-up. As a result, card detection is disabled and power is saved.
240 */
241static int sdio_disable_cd(struct mmc_card *card)
242{
243 int ret;
244 u8 ctrl;
245
246 if (!mmc_card_disable_cd(card))
247 return 0;
248
249 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
250 if (ret)
251 return ret;
252
253 ctrl |= SDIO_BUS_CD_DISABLE;
254
255 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
256}
257
258/*
259 * Devices that remain active during a system suspend are
260 * put back into 1-bit mode.
261 */
262static int sdio_disable_wide(struct mmc_card *card)
263{
264 int ret;
265 u8 ctrl;
266
267 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
268 return 0;
269
270 if (card->cccr.low_speed && !card->cccr.wide_bus)
271 return 0;
272
273 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
274 if (ret)
275 return ret;
276
277 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
278 return 0;
279
280 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
281 ctrl |= SDIO_BUS_ASYNC_INT;
282
283 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
284 if (ret)
285 return ret;
286
287 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
288
289 return 0;
290}
291
292
293static int sdio_enable_4bit_bus(struct mmc_card *card)
294{
295 int err;
296
297 if (card->type == MMC_TYPE_SDIO)
298 err = sdio_enable_wide(card);
299 else if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
300 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
301 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
302 if (err)
303 return err;
304 err = sdio_enable_wide(card);
305 if (err <= 0)
306 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
307 } else
308 return 0;
309
310 if (err > 0) {
311 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
312 err = 0;
313 }
314
315 return err;
316}
317
318
319/*
320 * Test if the card supports high-speed mode and, if so, switch to it.
321 */
322static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
323{
324 int ret;
325 u8 speed;
326
327 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
328 return 0;
329
330 if (!card->cccr.high_speed)
331 return 0;
332
333 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
334 if (ret)
335 return ret;
336
337 if (enable)
338 speed |= SDIO_SPEED_EHS;
339 else
340 speed &= ~SDIO_SPEED_EHS;
341
342 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
343 if (ret)
344 return ret;
345
346 return 1;
347}
348
349/*
350 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
351 */
352static int sdio_enable_hs(struct mmc_card *card)
353{
354 int ret;
355
356 ret = mmc_sdio_switch_hs(card, true);
357 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
358 return ret;
359
360 ret = mmc_sd_switch_hs(card);
361 if (ret <= 0)
362 mmc_sdio_switch_hs(card, false);
363
364 return ret;
365}
366
367static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
368{
369 unsigned max_dtr;
370
371 if (mmc_card_hs(card)) {
372 /*
373 * The SDIO specification doesn't mention how
374 * the CIS transfer speed register relates to
375 * high-speed, but it seems that 50 MHz is
376 * mandatory.
377 */
378 max_dtr = 50000000;
379 } else {
380 max_dtr = card->cis.max_dtr;
381 }
382
383 if (card->type == MMC_TYPE_SD_COMBO)
384 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
385
386 return max_dtr;
387}
388
389static unsigned char host_drive_to_sdio_drive(int host_strength)
390{
391 switch (host_strength) {
392 case MMC_SET_DRIVER_TYPE_A:
393 return SDIO_DTSx_SET_TYPE_A;
394 case MMC_SET_DRIVER_TYPE_B:
395 return SDIO_DTSx_SET_TYPE_B;
396 case MMC_SET_DRIVER_TYPE_C:
397 return SDIO_DTSx_SET_TYPE_C;
398 case MMC_SET_DRIVER_TYPE_D:
399 return SDIO_DTSx_SET_TYPE_D;
400 default:
401 return SDIO_DTSx_SET_TYPE_B;
402 }
403}
404
405static void sdio_select_driver_type(struct mmc_card *card)
406{
407 int card_drv_type, drive_strength, drv_type;
408 unsigned char card_strength;
409 int err;
410
411 card->drive_strength = 0;
412
413 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
414
415 drive_strength = mmc_select_drive_strength(card,
416 card->sw_caps.uhs_max_dtr,
417 card_drv_type, &drv_type);
418
419 if (drive_strength) {
420 /* if error just use default for drive strength B */
421 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
422 &card_strength);
423 if (err)
424 return;
425
426 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
427 card_strength |= host_drive_to_sdio_drive(drive_strength);
428
429 /* if error default to drive strength B */
430 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
431 card_strength, NULL);
432 if (err)
433 return;
434 card->drive_strength = drive_strength;
435 }
436
437 if (drv_type)
438 mmc_set_driver_type(card->host, drv_type);
439}
440
441
442static int sdio_set_bus_speed_mode(struct mmc_card *card)
443{
444 unsigned int bus_speed, timing;
445 int err;
446 unsigned char speed;
447
448 /*
449 * If the host doesn't support any of the UHS-I modes, fallback on
450 * default speed.
451 */
452 if (!mmc_host_uhs(card->host))
453 return 0;
454
455 bus_speed = SDIO_SPEED_SDR12;
456 timing = MMC_TIMING_UHS_SDR12;
457 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
458 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
459 bus_speed = SDIO_SPEED_SDR104;
460 timing = MMC_TIMING_UHS_SDR104;
461 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
462 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
463 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
464 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
465 bus_speed = SDIO_SPEED_DDR50;
466 timing = MMC_TIMING_UHS_DDR50;
467 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
468 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
469 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
470 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
471 SD_MODE_UHS_SDR50)) {
472 bus_speed = SDIO_SPEED_SDR50;
473 timing = MMC_TIMING_UHS_SDR50;
474 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
475 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
476 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
477 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
478 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
479 bus_speed = SDIO_SPEED_SDR25;
480 timing = MMC_TIMING_UHS_SDR25;
481 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
482 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
483 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
484 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
485 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
486 SD_MODE_UHS_SDR12)) {
487 bus_speed = SDIO_SPEED_SDR12;
488 timing = MMC_TIMING_UHS_SDR12;
489 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
490 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
491 }
492
493 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
494 if (err)
495 return err;
496
497 speed &= ~SDIO_SPEED_BSS_MASK;
498 speed |= bus_speed;
499 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
500 if (err)
501 return err;
502
503 if (bus_speed) {
504 mmc_set_timing(card->host, timing);
505 mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
506 }
507
508 return 0;
509}
510
511/*
512 * UHS-I specific initialization procedure
513 */
514static 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);
542out:
543 return err;
544}
545
546static 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 */
561static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
562 struct mmc_card *oldcard, int powered_resume)
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
576try_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 if (!powered_resume) {
586 err = mmc_send_io_op_cond(host, ocr, &rocr);
587 if (err)
588 goto err;
589 }
590
591 /*
592 * For SPI, enable CRC as appropriate.
593 */
594 if (mmc_host_is_spi(host)) {
595 err = mmc_spi_set_crc(host, use_spi_crc);
596 if (err)
597 goto err;
598 }
599
600 /*
601 * Allocate card structure.
602 */
603 card = mmc_alloc_card(host, NULL);
604 if (IS_ERR(card)) {
605 err = PTR_ERR(card);
606 goto err;
607 }
608
609 if ((rocr & R4_MEMORY_PRESENT) &&
610 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
611 card->type = MMC_TYPE_SD_COMBO;
612
613 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
614 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
615 mmc_remove_card(card);
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 return -ENOENT;
624 }
625 }
626
627 /*
628 * Call the optional HC's init_card function to handle quirks.
629 */
630 if (host->ops->init_card)
631 host->ops->init_card(host, card);
632
633 /*
634 * If the host and card support UHS-I mode request the card
635 * to switch to 1.8V signaling level. No 1.8v signalling if
636 * UHS mode is not enabled to maintain compatibility and some
637 * systems that claim 1.8v signalling in fact do not support
638 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
639 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
640 * fails to check rocr & R4_18V_PRESENT, but we still need to
641 * try to init uhs card. sdio_read_cccr will take over this task
642 * to make sure which speed mode should work.
643 */
644 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
645 err = mmc_set_uhs_voltage(host, ocr_card);
646 if (err == -EAGAIN) {
647 mmc_sdio_resend_if_cond(host, card);
648 retries--;
649 goto try_again;
650 } else if (err) {
651 ocr &= ~R4_18V_PRESENT;
652 }
653 }
654
655 /*
656 * For native busses: set card RCA and quit open drain mode.
657 */
658 if (!powered_resume && !mmc_host_is_spi(host)) {
659 err = mmc_send_relative_addr(host, &card->rca);
660 if (err)
661 goto remove;
662
663 /*
664 * Update oldcard with the new RCA received from the SDIO
665 * device -- we're doing this so that it's updated in the
666 * "card" struct when oldcard overwrites that later.
667 */
668 if (oldcard)
669 oldcard->rca = card->rca;
670 }
671
672 /*
673 * Read CSD, before selecting the card
674 */
675 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
676 err = mmc_sd_get_csd(host, card);
677 if (err)
678 return err;
679
680 mmc_decode_cid(card);
681 }
682
683 /*
684 * Select card, as all following commands rely on that.
685 */
686 if (!powered_resume && !mmc_host_is_spi(host)) {
687 err = mmc_select_card(card);
688 if (err)
689 goto remove;
690 }
691
692 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
693 /*
694 * This is non-standard SDIO device, meaning it doesn't
695 * have any CIA (Common I/O area) registers present.
696 * It's host's responsibility to fill cccr and cis
697 * structures in init_card().
698 */
699 mmc_set_clock(host, card->cis.max_dtr);
700
701 if (card->cccr.high_speed) {
702 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
703 }
704
705 goto finish;
706 }
707
708 /*
709 * Read the common registers. Note that we should try to
710 * validate whether UHS would work or not.
711 */
712 err = sdio_read_cccr(card, ocr);
713 if (err) {
714 mmc_sdio_resend_if_cond(host, card);
715 if (ocr & R4_18V_PRESENT) {
716 /* Retry init sequence, but without R4_18V_PRESENT. */
717 retries = 0;
718 goto try_again;
719 } else {
720 goto remove;
721 }
722 }
723
724 /*
725 * Read the common CIS tuples.
726 */
727 err = sdio_read_common_cis(card);
728 if (err)
729 goto remove;
730
731 if (oldcard) {
732 int same = (card->cis.vendor == oldcard->cis.vendor &&
733 card->cis.device == oldcard->cis.device);
734 mmc_remove_card(card);
735 if (!same)
736 return -ENOENT;
737
738 card = oldcard;
739 }
740 card->ocr = ocr_card;
741 mmc_fixup_device(card, sdio_fixup_methods);
742
743 if (card->type == MMC_TYPE_SD_COMBO) {
744 err = mmc_sd_setup_card(host, card, oldcard != NULL);
745 /* handle as SDIO-only card if memory init failed */
746 if (err) {
747 mmc_go_idle(host);
748 if (mmc_host_is_spi(host))
749 /* should not fail, as it worked previously */
750 mmc_spi_set_crc(host, use_spi_crc);
751 card->type = MMC_TYPE_SDIO;
752 } else
753 card->dev.type = &sd_type;
754 }
755
756 /*
757 * If needed, disconnect card detection pull-up resistor.
758 */
759 err = sdio_disable_cd(card);
760 if (err)
761 goto remove;
762
763 /* Initialization sequence for UHS-I cards */
764 /* Only if card supports 1.8v and UHS signaling */
765 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
766 err = mmc_sdio_init_uhs_card(card);
767 if (err)
768 goto remove;
769 } else {
770 /*
771 * Switch to high-speed (if supported).
772 */
773 err = sdio_enable_hs(card);
774 if (err > 0)
775 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
776 else if (err)
777 goto remove;
778
779 /*
780 * Change to the card's maximum speed.
781 */
782 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
783
784 /*
785 * Switch to wider bus (if supported).
786 */
787 err = sdio_enable_4bit_bus(card);
788 if (err)
789 goto remove;
790 }
791finish:
792 if (!oldcard)
793 host->card = card;
794 return 0;
795
796remove:
797 if (!oldcard)
798 mmc_remove_card(card);
799
800err:
801 return err;
802}
803
804/*
805 * Host is being removed. Free up the current card.
806 */
807static void mmc_sdio_remove(struct mmc_host *host)
808{
809 int i;
810
811 for (i = 0;i < host->card->sdio_funcs;i++) {
812 if (host->card->sdio_func[i]) {
813 sdio_remove_func(host->card->sdio_func[i]);
814 host->card->sdio_func[i] = NULL;
815 }
816 }
817
818 mmc_remove_card(host->card);
819 host->card = NULL;
820}
821
822/*
823 * Card detection - card is alive.
824 */
825static int mmc_sdio_alive(struct mmc_host *host)
826{
827 return mmc_select_card(host->card);
828}
829
830/*
831 * Card detection callback from host.
832 */
833static void mmc_sdio_detect(struct mmc_host *host)
834{
835 int err;
836
837 /* Make sure card is powered before detecting it */
838 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
839 err = pm_runtime_get_sync(&host->card->dev);
840 if (err < 0) {
841 pm_runtime_put_noidle(&host->card->dev);
842 goto out;
843 }
844 }
845
846 mmc_claim_host(host);
847
848 /*
849 * Just check if our card has been removed.
850 */
851 err = _mmc_detect_card_removed(host);
852
853 mmc_release_host(host);
854
855 /*
856 * Tell PM core it's OK to power off the card now.
857 *
858 * The _sync variant is used in order to ensure that the card
859 * is left powered off in case an error occurred, and the card
860 * is going to be removed.
861 *
862 * Since there is no specific reason to believe a new user
863 * is about to show up at this point, the _sync variant is
864 * desirable anyway.
865 */
866 if (host->caps & MMC_CAP_POWER_OFF_CARD)
867 pm_runtime_put_sync(&host->card->dev);
868
869out:
870 if (err) {
871 mmc_sdio_remove(host);
872
873 mmc_claim_host(host);
874 mmc_detach_bus(host);
875 mmc_power_off(host);
876 mmc_release_host(host);
877 }
878}
879
880/*
881 * SDIO pre_suspend. We need to suspend all functions separately.
882 * Therefore all registered functions must have drivers with suspend
883 * and resume methods. Failing that we simply remove the whole card.
884 */
885static int mmc_sdio_pre_suspend(struct mmc_host *host)
886{
887 int i, err = 0;
888
889 for (i = 0; i < host->card->sdio_funcs; i++) {
890 struct sdio_func *func = host->card->sdio_func[i];
891 if (func && sdio_func_present(func) && func->dev.driver) {
892 const struct dev_pm_ops *pmops = func->dev.driver->pm;
893 if (!pmops || !pmops->suspend || !pmops->resume) {
894 /* force removal of entire card in that case */
895 err = -ENOSYS;
896 break;
897 }
898 }
899 }
900
901 return err;
902}
903
904/*
905 * SDIO suspend. Suspend all functions separately.
906 */
907static int mmc_sdio_suspend(struct mmc_host *host)
908{
909 mmc_claim_host(host);
910
911 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
912 sdio_disable_wide(host->card);
913
914 if (!mmc_card_keep_power(host)) {
915 mmc_power_off(host);
916 } else if (host->retune_period) {
917 mmc_retune_timer_stop(host);
918 mmc_retune_needed(host);
919 }
920
921 mmc_release_host(host);
922
923 return 0;
924}
925
926static int mmc_sdio_resume(struct mmc_host *host)
927{
928 int err = 0;
929
930 /* Basic card reinitialization. */
931 mmc_claim_host(host);
932
933 /* Restore power if needed */
934 if (!mmc_card_keep_power(host)) {
935 mmc_power_up(host, host->card->ocr);
936 /*
937 * Tell runtime PM core we just powered up the card,
938 * since it still believes the card is powered off.
939 * Note that currently runtime PM is only enabled
940 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
941 */
942 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
943 pm_runtime_disable(&host->card->dev);
944 pm_runtime_set_active(&host->card->dev);
945 pm_runtime_enable(&host->card->dev);
946 }
947 }
948
949 /* No need to reinitialize powered-resumed nonremovable cards */
950 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
951 sdio_reset(host);
952 mmc_go_idle(host);
953 mmc_send_if_cond(host, host->card->ocr);
954 err = mmc_send_io_op_cond(host, 0, NULL);
955 if (!err)
956 err = mmc_sdio_init_card(host, host->card->ocr,
957 host->card,
958 mmc_card_keep_power(host));
959 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
960 /* We may have switched to 1-bit mode during suspend */
961 err = sdio_enable_4bit_bus(host->card);
962 }
963
964 if (!err && host->sdio_irqs) {
965 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
966 wake_up_process(host->sdio_irq_thread);
967 else if (host->caps & MMC_CAP_SDIO_IRQ)
968 host->ops->enable_sdio_irq(host, 1);
969 }
970
971 mmc_release_host(host);
972
973 host->pm_flags &= ~MMC_PM_KEEP_POWER;
974 return err;
975}
976
977static int mmc_sdio_power_restore(struct mmc_host *host)
978{
979 int ret;
980
981 mmc_claim_host(host);
982
983 /*
984 * Reset the card by performing the same steps that are taken by
985 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
986 *
987 * sdio_reset() is technically not needed. Having just powered up the
988 * hardware, it should already be in reset state. However, some
989 * platforms (such as SD8686 on OLPC) do not instantly cut power,
990 * meaning that a reset is required when restoring power soon after
991 * powering off. It is harmless in other cases.
992 *
993 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
994 * is not necessary for non-removable cards. However, it is required
995 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
996 * harmless in other situations.
997 *
998 */
999
1000 sdio_reset(host);
1001 mmc_go_idle(host);
1002 mmc_send_if_cond(host, host->card->ocr);
1003
1004 ret = mmc_send_io_op_cond(host, 0, NULL);
1005 if (ret)
1006 goto out;
1007
1008 ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1009 mmc_card_keep_power(host));
1010 if (!ret && host->sdio_irqs)
1011 mmc_signal_sdio_irq(host);
1012
1013out:
1014 mmc_release_host(host);
1015
1016 return ret;
1017}
1018
1019static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1020{
1021 /* No references to the card, cut the power to it. */
1022 mmc_claim_host(host);
1023 mmc_power_off(host);
1024 mmc_release_host(host);
1025
1026 return 0;
1027}
1028
1029static int mmc_sdio_runtime_resume(struct mmc_host *host)
1030{
1031 int ret;
1032
1033 /* Restore power and re-initialize. */
1034 mmc_claim_host(host);
1035 mmc_power_up(host, host->card->ocr);
1036 ret = mmc_sdio_power_restore(host);
1037 mmc_release_host(host);
1038
1039 return ret;
1040}
1041
1042static int mmc_sdio_reset(struct mmc_host *host)
1043{
1044 mmc_power_cycle(host, host->card->ocr);
1045 return mmc_sdio_power_restore(host);
1046}
1047
1048static const struct mmc_bus_ops mmc_sdio_ops = {
1049 .remove = mmc_sdio_remove,
1050 .detect = mmc_sdio_detect,
1051 .pre_suspend = mmc_sdio_pre_suspend,
1052 .suspend = mmc_sdio_suspend,
1053 .resume = mmc_sdio_resume,
1054 .runtime_suspend = mmc_sdio_runtime_suspend,
1055 .runtime_resume = mmc_sdio_runtime_resume,
1056 .power_restore = mmc_sdio_power_restore,
1057 .alive = mmc_sdio_alive,
1058 .reset = mmc_sdio_reset,
1059};
1060
1061
1062/*
1063 * Starting point for SDIO card init.
1064 */
1065int mmc_attach_sdio(struct mmc_host *host)
1066{
1067 int err, i, funcs;
1068 u32 ocr, rocr;
1069 struct mmc_card *card;
1070
1071 WARN_ON(!host->claimed);
1072
1073 err = mmc_send_io_op_cond(host, 0, &ocr);
1074 if (err)
1075 return err;
1076
1077 mmc_attach_bus(host, &mmc_sdio_ops);
1078 if (host->ocr_avail_sdio)
1079 host->ocr_avail = host->ocr_avail_sdio;
1080
1081
1082 rocr = mmc_select_voltage(host, ocr);
1083
1084 /*
1085 * Can we support the voltage(s) of the card(s)?
1086 */
1087 if (!rocr) {
1088 err = -EINVAL;
1089 goto err;
1090 }
1091
1092 /*
1093 * Detect and init the card.
1094 */
1095 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1096 if (err)
1097 goto err;
1098
1099 card = host->card;
1100
1101 /*
1102 * Enable runtime PM only if supported by host+card+board
1103 */
1104 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1105 /*
1106 * Do not allow runtime suspend until after SDIO function
1107 * devices are added.
1108 */
1109 pm_runtime_get_noresume(&card->dev);
1110
1111 /*
1112 * Let runtime PM core know our card is active
1113 */
1114 err = pm_runtime_set_active(&card->dev);
1115 if (err)
1116 goto remove;
1117
1118 /*
1119 * Enable runtime PM for this card
1120 */
1121 pm_runtime_enable(&card->dev);
1122 }
1123
1124 /*
1125 * The number of functions on the card is encoded inside
1126 * the ocr.
1127 */
1128 funcs = (ocr & 0x70000000) >> 28;
1129 card->sdio_funcs = 0;
1130
1131 /*
1132 * Initialize (but don't add) all present functions.
1133 */
1134 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1135 err = sdio_init_func(host->card, i + 1);
1136 if (err)
1137 goto remove;
1138
1139 /*
1140 * Enable Runtime PM for this func (if supported)
1141 */
1142 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1143 pm_runtime_enable(&card->sdio_func[i]->dev);
1144 }
1145
1146 /*
1147 * First add the card to the driver model...
1148 */
1149 mmc_release_host(host);
1150 err = mmc_add_card(host->card);
1151 if (err)
1152 goto remove_added;
1153
1154 /*
1155 * ...then the SDIO functions.
1156 */
1157 for (i = 0;i < funcs;i++) {
1158 err = sdio_add_func(host->card->sdio_func[i]);
1159 if (err)
1160 goto remove_added;
1161 }
1162
1163 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1164 pm_runtime_put(&card->dev);
1165
1166 mmc_claim_host(host);
1167 return 0;
1168
1169
1170remove:
1171 mmc_release_host(host);
1172remove_added:
1173 /*
1174 * The devices are being deleted so it is not necessary to disable
1175 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1176 * because it needs to be active to remove any function devices that
1177 * were probed, and after that it gets deleted.
1178 */
1179 mmc_sdio_remove(host);
1180 mmc_claim_host(host);
1181err:
1182 mmc_detach_bus(host);
1183
1184 pr_err("%s: error %d whilst initialising SDIO card\n",
1185 mmc_hostname(host), err);
1186
1187 return err;
1188}
1189