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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 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 return max_dtr;
462}
463
464static unsigned char host_drive_to_sdio_drive(int host_strength)
465{
466 switch (host_strength) {
467 case MMC_SET_DRIVER_TYPE_A:
468 return SDIO_DTSx_SET_TYPE_A;
469 case MMC_SET_DRIVER_TYPE_B:
470 return SDIO_DTSx_SET_TYPE_B;
471 case MMC_SET_DRIVER_TYPE_C:
472 return SDIO_DTSx_SET_TYPE_C;
473 case MMC_SET_DRIVER_TYPE_D:
474 return SDIO_DTSx_SET_TYPE_D;
475 default:
476 return SDIO_DTSx_SET_TYPE_B;
477 }
478}
479
480static void sdio_select_driver_type(struct mmc_card *card)
481{
482 int card_drv_type, drive_strength, drv_type;
483 unsigned char card_strength;
484 int err;
485
486 card->drive_strength = 0;
487
488 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
489
490 drive_strength = mmc_select_drive_strength(card,
491 card->sw_caps.uhs_max_dtr,
492 card_drv_type, &drv_type);
493
494 if (drive_strength) {
495 /* if error just use default for drive strength B */
496 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
497 &card_strength);
498 if (err)
499 return;
500
501 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
502 card_strength |= host_drive_to_sdio_drive(drive_strength);
503
504 /* if error default to drive strength B */
505 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
506 card_strength, NULL);
507 if (err)
508 return;
509 card->drive_strength = drive_strength;
510 }
511
512 if (drv_type)
513 mmc_set_driver_type(card->host, drv_type);
514}
515
516
517static int sdio_set_bus_speed_mode(struct mmc_card *card)
518{
519 unsigned int bus_speed, timing;
520 int err;
521 unsigned char speed;
522 unsigned int max_rate;
523
524 /*
525 * If the host doesn't support any of the UHS-I modes, fallback on
526 * default speed.
527 */
528 if (!mmc_host_uhs(card->host))
529 return 0;
530
531 bus_speed = SDIO_SPEED_SDR12;
532 timing = MMC_TIMING_UHS_SDR12;
533 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
534 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
535 bus_speed = SDIO_SPEED_SDR104;
536 timing = MMC_TIMING_UHS_SDR104;
537 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
538 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
539 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
540 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
541 bus_speed = SDIO_SPEED_DDR50;
542 timing = MMC_TIMING_UHS_DDR50;
543 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
544 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
545 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
546 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
547 SD_MODE_UHS_SDR50)) {
548 bus_speed = SDIO_SPEED_SDR50;
549 timing = MMC_TIMING_UHS_SDR50;
550 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
551 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
552 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
553 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
554 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
555 bus_speed = SDIO_SPEED_SDR25;
556 timing = MMC_TIMING_UHS_SDR25;
557 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
558 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
559 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
560 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
561 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
562 SD_MODE_UHS_SDR12)) {
563 bus_speed = SDIO_SPEED_SDR12;
564 timing = MMC_TIMING_UHS_SDR12;
565 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
566 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
567 }
568
569 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
570 if (err)
571 return err;
572
573 speed &= ~SDIO_SPEED_BSS_MASK;
574 speed |= bus_speed;
575 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
576 if (err)
577 return err;
578
579 max_rate = min_not_zero(card->quirk_max_rate,
580 card->sw_caps.uhs_max_dtr);
581
582 mmc_set_timing(card->host, timing);
583 mmc_set_clock(card->host, max_rate);
584
585 return 0;
586}
587
588/*
589 * UHS-I specific initialization procedure
590 */
591static int mmc_sdio_init_uhs_card(struct mmc_card *card)
592{
593 int err;
594
595 if (!card->scr.sda_spec3)
596 return 0;
597
598 /* Switch to wider bus */
599 err = sdio_enable_4bit_bus(card);
600 if (err)
601 goto out;
602
603 /* Set the driver strength for the card */
604 sdio_select_driver_type(card);
605
606 /* Set bus speed mode of the card */
607 err = sdio_set_bus_speed_mode(card);
608 if (err)
609 goto out;
610
611 /*
612 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
613 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
614 */
615 if (!mmc_host_is_spi(card->host) &&
616 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
617 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
618 err = mmc_execute_tuning(card);
619out:
620 return err;
621}
622
623static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
624 struct mmc_card *card)
625{
626 if (card)
627 mmc_remove_card(card);
628
629 /*
630 * Reset the card by performing the same steps that are taken by
631 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
632 *
633 * sdio_reset() is technically not needed. Having just powered up the
634 * hardware, it should already be in reset state. However, some
635 * platforms (such as SD8686 on OLPC) do not instantly cut power,
636 * meaning that a reset is required when restoring power soon after
637 * powering off. It is harmless in other cases.
638 *
639 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
640 * is not necessary for non-removable cards. However, it is required
641 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
642 * harmless in other situations.
643 *
644 */
645
646 sdio_reset(host);
647 mmc_go_idle(host);
648 mmc_send_if_cond(host, ocr);
649 return mmc_send_io_op_cond(host, 0, NULL);
650}
651
652/*
653 * Handle the detection and initialisation of a card.
654 *
655 * In the case of a resume, "oldcard" will contain the card
656 * we're trying to reinitialise.
657 */
658static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
659 struct mmc_card *oldcard)
660{
661 struct mmc_card *card;
662 int err;
663 int retries = 10;
664 u32 rocr = 0;
665 u32 ocr_card = ocr;
666
667 WARN_ON(!host->claimed);
668
669 /* to query card if 1.8V signalling is supported */
670 if (mmc_host_uhs(host))
671 ocr |= R4_18V_PRESENT;
672
673try_again:
674 if (!retries) {
675 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
676 ocr &= ~R4_18V_PRESENT;
677 }
678
679 /*
680 * Inform the card of the voltage
681 */
682 err = mmc_send_io_op_cond(host, ocr, &rocr);
683 if (err)
684 return err;
685
686 /*
687 * For SPI, enable CRC as appropriate.
688 */
689 if (mmc_host_is_spi(host)) {
690 err = mmc_spi_set_crc(host, use_spi_crc);
691 if (err)
692 return err;
693 }
694
695 /*
696 * Allocate card structure.
697 */
698 card = mmc_alloc_card(host, &sdio_type);
699 if (IS_ERR(card))
700 return PTR_ERR(card);
701
702 if ((rocr & R4_MEMORY_PRESENT) &&
703 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
704 card->type = MMC_TYPE_SD_COMBO;
705
706 if (oldcard && (!mmc_card_sd_combo(oldcard) ||
707 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
708 err = -ENOENT;
709 goto mismatch;
710 }
711 } else {
712 card->type = MMC_TYPE_SDIO;
713
714 if (oldcard && !mmc_card_sdio(oldcard)) {
715 err = -ENOENT;
716 goto mismatch;
717 }
718 }
719
720 /*
721 * Call the optional HC's init_card function to handle quirks.
722 */
723 if (host->ops->init_card)
724 host->ops->init_card(host, card);
725 mmc_fixup_device(card, sdio_card_init_methods);
726
727 card->ocr = ocr_card;
728
729 /*
730 * If the host and card support UHS-I mode request the card
731 * to switch to 1.8V signaling level. No 1.8v signalling if
732 * UHS mode is not enabled to maintain compatibility and some
733 * systems that claim 1.8v signalling in fact do not support
734 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
735 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
736 * fails to check rocr & R4_18V_PRESENT, but we still need to
737 * try to init uhs card. sdio_read_cccr will take over this task
738 * to make sure which speed mode should work.
739 */
740 if (rocr & ocr & R4_18V_PRESENT) {
741 err = mmc_set_uhs_voltage(host, ocr_card);
742 if (err == -EAGAIN) {
743 mmc_sdio_pre_init(host, ocr_card, card);
744 retries--;
745 goto try_again;
746 } else if (err) {
747 ocr &= ~R4_18V_PRESENT;
748 }
749 }
750
751 /*
752 * For native busses: set card RCA and quit open drain mode.
753 */
754 if (!mmc_host_is_spi(host)) {
755 err = mmc_send_relative_addr(host, &card->rca);
756 if (err)
757 goto remove;
758
759 /*
760 * Update oldcard with the new RCA received from the SDIO
761 * device -- we're doing this so that it's updated in the
762 * "card" struct when oldcard overwrites that later.
763 */
764 if (oldcard)
765 oldcard->rca = card->rca;
766 }
767
768 /*
769 * Read CSD, before selecting the card
770 */
771 if (!oldcard && mmc_card_sd_combo(card)) {
772 err = mmc_sd_get_csd(card);
773 if (err)
774 goto remove;
775
776 mmc_decode_cid(card);
777 }
778
779 /*
780 * Select card, as all following commands rely on that.
781 */
782 if (!mmc_host_is_spi(host)) {
783 err = mmc_select_card(card);
784 if (err)
785 goto remove;
786 }
787
788 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
789 /*
790 * This is non-standard SDIO device, meaning it doesn't
791 * have any CIA (Common I/O area) registers present.
792 * It's host's responsibility to fill cccr and cis
793 * structures in init_card().
794 */
795 mmc_set_clock(host, card->cis.max_dtr);
796
797 if (card->cccr.high_speed) {
798 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
799 }
800
801 if (oldcard)
802 mmc_remove_card(card);
803 else
804 host->card = card;
805
806 return 0;
807 }
808
809 /*
810 * Read the common registers. Note that we should try to
811 * validate whether UHS would work or not.
812 */
813 err = sdio_read_cccr(card, ocr);
814 if (err) {
815 mmc_sdio_pre_init(host, ocr_card, card);
816 if (ocr & R4_18V_PRESENT) {
817 /* Retry init sequence, but without R4_18V_PRESENT. */
818 retries = 0;
819 goto try_again;
820 }
821 return err;
822 }
823
824 /*
825 * Read the common CIS tuples.
826 */
827 err = sdio_read_common_cis(card);
828 if (err)
829 goto remove;
830
831 if (oldcard) {
832 if (card->cis.vendor == oldcard->cis.vendor &&
833 card->cis.device == oldcard->cis.device) {
834 mmc_remove_card(card);
835 card = oldcard;
836 } else {
837 err = -ENOENT;
838 goto mismatch;
839 }
840 }
841
842 mmc_fixup_device(card, sdio_fixup_methods);
843
844 if (mmc_card_sd_combo(card)) {
845 err = mmc_sd_setup_card(host, card, oldcard != NULL);
846 /* handle as SDIO-only card if memory init failed */
847 if (err) {
848 mmc_go_idle(host);
849 if (mmc_host_is_spi(host))
850 /* should not fail, as it worked previously */
851 mmc_spi_set_crc(host, use_spi_crc);
852 card->type = MMC_TYPE_SDIO;
853 } else
854 card->dev.type = &sd_type;
855 }
856
857 /*
858 * If needed, disconnect card detection pull-up resistor.
859 */
860 err = sdio_disable_cd(card);
861 if (err)
862 goto remove;
863
864 /* Initialization sequence for UHS-I cards */
865 /* Only if card supports 1.8v and UHS signaling */
866 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
867 err = mmc_sdio_init_uhs_card(card);
868 if (err)
869 goto remove;
870 } else {
871 /*
872 * Switch to high-speed (if supported).
873 */
874 err = sdio_enable_hs(card);
875 if (err > 0)
876 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
877 else if (err)
878 goto remove;
879
880 /*
881 * Change to the card's maximum speed.
882 */
883 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
884
885 /*
886 * Switch to wider bus (if supported).
887 */
888 err = sdio_enable_4bit_bus(card);
889 if (err)
890 goto remove;
891 }
892
893 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
894 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
895 pr_err("%s: Host failed to negotiate down from 3.3V\n",
896 mmc_hostname(host));
897 err = -EINVAL;
898 goto remove;
899 }
900
901 host->card = card;
902 return 0;
903
904mismatch:
905 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
906remove:
907 if (oldcard != card)
908 mmc_remove_card(card);
909 return err;
910}
911
912static int mmc_sdio_reinit_card(struct mmc_host *host)
913{
914 int ret;
915
916 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
917 if (ret)
918 return ret;
919
920 return mmc_sdio_init_card(host, host->card->ocr, host->card);
921}
922
923/*
924 * Host is being removed. Free up the current card.
925 */
926static void mmc_sdio_remove(struct mmc_host *host)
927{
928 int i;
929
930 for (i = 0;i < host->card->sdio_funcs;i++) {
931 if (host->card->sdio_func[i]) {
932 sdio_remove_func(host->card->sdio_func[i]);
933 host->card->sdio_func[i] = NULL;
934 }
935 }
936
937 mmc_remove_card(host->card);
938 host->card = NULL;
939}
940
941/*
942 * Card detection - card is alive.
943 */
944static int mmc_sdio_alive(struct mmc_host *host)
945{
946 return mmc_select_card(host->card);
947}
948
949/*
950 * Card detection callback from host.
951 */
952static void mmc_sdio_detect(struct mmc_host *host)
953{
954 int err;
955
956 /* Make sure card is powered before detecting it */
957 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
958 err = pm_runtime_resume_and_get(&host->card->dev);
959 if (err < 0)
960 goto out;
961 }
962
963 mmc_claim_host(host);
964
965 /*
966 * Just check if our card has been removed.
967 */
968 err = _mmc_detect_card_removed(host);
969
970 mmc_release_host(host);
971
972 /*
973 * Tell PM core it's OK to power off the card now.
974 *
975 * The _sync variant is used in order to ensure that the card
976 * is left powered off in case an error occurred, and the card
977 * is going to be removed.
978 *
979 * Since there is no specific reason to believe a new user
980 * is about to show up at this point, the _sync variant is
981 * desirable anyway.
982 */
983 if (host->caps & MMC_CAP_POWER_OFF_CARD)
984 pm_runtime_put_sync(&host->card->dev);
985
986out:
987 if (err) {
988 mmc_sdio_remove(host);
989
990 mmc_claim_host(host);
991 mmc_detach_bus(host);
992 mmc_power_off(host);
993 mmc_release_host(host);
994 }
995}
996
997/*
998 * SDIO pre_suspend. We need to suspend all functions separately.
999 * Therefore all registered functions must have drivers with suspend
1000 * and resume methods. Failing that we simply remove the whole card.
1001 */
1002static int mmc_sdio_pre_suspend(struct mmc_host *host)
1003{
1004 int i;
1005
1006 for (i = 0; i < host->card->sdio_funcs; i++) {
1007 struct sdio_func *func = host->card->sdio_func[i];
1008 if (func && sdio_func_present(func) && func->dev.driver) {
1009 const struct dev_pm_ops *pmops = func->dev.driver->pm;
1010 if (!pmops || !pmops->suspend || !pmops->resume)
1011 /* force removal of entire card in that case */
1012 goto remove;
1013 }
1014 }
1015
1016 return 0;
1017
1018remove:
1019 if (!mmc_card_is_removable(host)) {
1020 dev_warn(mmc_dev(host),
1021 "missing suspend/resume ops for non-removable SDIO card\n");
1022 /* Don't remove a non-removable card - we can't re-detect it. */
1023 return 0;
1024 }
1025
1026 /* Remove the SDIO card and let it be re-detected later on. */
1027 mmc_sdio_remove(host);
1028 mmc_claim_host(host);
1029 mmc_detach_bus(host);
1030 mmc_power_off(host);
1031 mmc_release_host(host);
1032 host->pm_flags = 0;
1033
1034 return 0;
1035}
1036
1037/*
1038 * SDIO suspend. Suspend all functions separately.
1039 */
1040static int mmc_sdio_suspend(struct mmc_host *host)
1041{
1042 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
1043
1044 /* Prevent processing of SDIO IRQs in suspended state. */
1045 mmc_card_set_suspended(host->card);
1046 cancel_work_sync(&host->sdio_irq_work);
1047
1048 mmc_claim_host(host);
1049
1050 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
1051 sdio_disable_4bit_bus(host->card);
1052
1053 if (!mmc_card_keep_power(host)) {
1054 mmc_power_off(host);
1055 } else if (host->retune_period) {
1056 mmc_retune_timer_stop(host);
1057 mmc_retune_needed(host);
1058 }
1059
1060 mmc_release_host(host);
1061
1062 return 0;
1063}
1064
1065static int mmc_sdio_resume(struct mmc_host *host)
1066{
1067 int err = 0;
1068
1069 /* Basic card reinitialization. */
1070 mmc_claim_host(host);
1071
1072 /*
1073 * Restore power and reinitialize the card when needed. Note that a
1074 * removable card is checked from a detect work later on in the resume
1075 * process.
1076 */
1077 if (!mmc_card_keep_power(host)) {
1078 mmc_power_up(host, host->card->ocr);
1079 /*
1080 * Tell runtime PM core we just powered up the card,
1081 * since it still believes the card is powered off.
1082 * Note that currently runtime PM is only enabled
1083 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1084 */
1085 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1086 pm_runtime_disable(&host->card->dev);
1087 pm_runtime_set_active(&host->card->dev);
1088 pm_runtime_enable(&host->card->dev);
1089 }
1090 err = mmc_sdio_reinit_card(host);
1091 } else if (mmc_card_wake_sdio_irq(host)) {
1092 /*
1093 * We may have switched to 1-bit mode during suspend,
1094 * need to hold retuning, because tuning only supprt
1095 * 4-bit mode or 8 bit mode.
1096 */
1097 mmc_retune_hold_now(host);
1098 err = sdio_enable_4bit_bus(host->card);
1099 mmc_retune_release(host);
1100 }
1101
1102 if (err)
1103 goto out;
1104
1105 /* Allow SDIO IRQs to be processed again. */
1106 mmc_card_clr_suspended(host->card);
1107
1108 if (host->sdio_irqs) {
1109 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1110 wake_up_process(host->sdio_irq_thread);
1111 else if (host->caps & MMC_CAP_SDIO_IRQ)
1112 schedule_work(&host->sdio_irq_work);
1113 }
1114
1115out:
1116 mmc_release_host(host);
1117
1118 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1119 return err;
1120}
1121
1122static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1123{
1124 /* No references to the card, cut the power to it. */
1125 mmc_claim_host(host);
1126 mmc_power_off(host);
1127 mmc_release_host(host);
1128
1129 return 0;
1130}
1131
1132static int mmc_sdio_runtime_resume(struct mmc_host *host)
1133{
1134 int ret;
1135
1136 /* Restore power and re-initialize. */
1137 mmc_claim_host(host);
1138 mmc_power_up(host, host->card->ocr);
1139 ret = mmc_sdio_reinit_card(host);
1140 mmc_release_host(host);
1141
1142 return ret;
1143}
1144
1145/*
1146 * SDIO HW reset
1147 *
1148 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1149 * reset was asynchronously scheduled, else a negative error code.
1150 */
1151static int mmc_sdio_hw_reset(struct mmc_host *host)
1152{
1153 struct mmc_card *card = host->card;
1154
1155 /*
1156 * In case the card is shared among multiple func drivers, reset the
1157 * card through a rescan work. In this way it will be removed and
1158 * re-detected, thus all func drivers becomes informed about it.
1159 */
1160 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1161 if (mmc_card_removed(card))
1162 return 1;
1163 host->rescan_entered = 0;
1164 mmc_card_set_removed(card);
1165 _mmc_detect_change(host, 0, false);
1166 return 1;
1167 }
1168
1169 /*
1170 * A single func driver has been probed, then let's skip the heavy
1171 * hotplug dance above and execute the reset immediately.
1172 */
1173 mmc_power_cycle(host, card->ocr);
1174 return mmc_sdio_reinit_card(host);
1175}
1176
1177static int mmc_sdio_sw_reset(struct mmc_host *host)
1178{
1179 mmc_set_clock(host, host->f_init);
1180 sdio_reset(host);
1181 mmc_go_idle(host);
1182
1183 mmc_set_initial_state(host);
1184 mmc_set_initial_signal_voltage(host);
1185
1186 return mmc_sdio_reinit_card(host);
1187}
1188
1189static const struct mmc_bus_ops mmc_sdio_ops = {
1190 .remove = mmc_sdio_remove,
1191 .detect = mmc_sdio_detect,
1192 .pre_suspend = mmc_sdio_pre_suspend,
1193 .suspend = mmc_sdio_suspend,
1194 .resume = mmc_sdio_resume,
1195 .runtime_suspend = mmc_sdio_runtime_suspend,
1196 .runtime_resume = mmc_sdio_runtime_resume,
1197 .alive = mmc_sdio_alive,
1198 .hw_reset = mmc_sdio_hw_reset,
1199 .sw_reset = mmc_sdio_sw_reset,
1200};
1201
1202
1203/*
1204 * Starting point for SDIO card init.
1205 */
1206int mmc_attach_sdio(struct mmc_host *host)
1207{
1208 int err, i, funcs;
1209 u32 ocr, rocr;
1210 struct mmc_card *card;
1211
1212 WARN_ON(!host->claimed);
1213
1214 err = mmc_send_io_op_cond(host, 0, &ocr);
1215 if (err)
1216 return err;
1217
1218 mmc_attach_bus(host, &mmc_sdio_ops);
1219 if (host->ocr_avail_sdio)
1220 host->ocr_avail = host->ocr_avail_sdio;
1221
1222
1223 rocr = mmc_select_voltage(host, ocr);
1224
1225 /*
1226 * Can we support the voltage(s) of the card(s)?
1227 */
1228 if (!rocr) {
1229 err = -EINVAL;
1230 goto err;
1231 }
1232
1233 /*
1234 * Detect and init the card.
1235 */
1236 err = mmc_sdio_init_card(host, rocr, NULL);
1237 if (err)
1238 goto err;
1239
1240 card = host->card;
1241
1242 /*
1243 * Enable runtime PM only if supported by host+card+board
1244 */
1245 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1246 /*
1247 * Do not allow runtime suspend until after SDIO function
1248 * devices are added.
1249 */
1250 pm_runtime_get_noresume(&card->dev);
1251
1252 /*
1253 * Let runtime PM core know our card is active
1254 */
1255 err = pm_runtime_set_active(&card->dev);
1256 if (err)
1257 goto remove;
1258
1259 /*
1260 * Enable runtime PM for this card
1261 */
1262 pm_runtime_enable(&card->dev);
1263 }
1264
1265 /*
1266 * The number of functions on the card is encoded inside
1267 * the ocr.
1268 */
1269 funcs = (ocr & 0x70000000) >> 28;
1270 card->sdio_funcs = 0;
1271
1272 /*
1273 * Initialize (but don't add) all present functions.
1274 */
1275 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1276 err = sdio_init_func(host->card, i + 1);
1277 if (err)
1278 goto remove;
1279
1280 /*
1281 * Enable Runtime PM for this func (if supported)
1282 */
1283 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1284 pm_runtime_enable(&card->sdio_func[i]->dev);
1285 }
1286
1287 /*
1288 * First add the card to the driver model...
1289 */
1290 mmc_release_host(host);
1291 err = mmc_add_card(host->card);
1292 if (err)
1293 goto remove_added;
1294
1295 /*
1296 * ...then the SDIO functions.
1297 */
1298 for (i = 0;i < funcs;i++) {
1299 err = sdio_add_func(host->card->sdio_func[i]);
1300 if (err)
1301 goto remove_added;
1302 }
1303
1304 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1305 pm_runtime_put(&card->dev);
1306
1307 mmc_claim_host(host);
1308 return 0;
1309
1310
1311remove:
1312 mmc_release_host(host);
1313remove_added:
1314 /*
1315 * The devices are being deleted so it is not necessary to disable
1316 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1317 * because it needs to be active to remove any function devices that
1318 * were probed, and after that it gets deleted.
1319 */
1320 mmc_sdio_remove(host);
1321 mmc_claim_host(host);
1322err:
1323 mmc_detach_bus(host);
1324
1325 pr_err("%s: error %d whilst initialising SDIO card\n",
1326 mmc_hostname(host), err);
1327
1328 return err;
1329}
1330
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/sdio.h>
18#include <linux/mmc/sdio_func.h>
19#include <linux/mmc/sdio_ids.h>
20
21#include "core.h"
22#include "bus.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
30static 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
56out:
57 return ret;
58}
59
60static int sdio_init_func(struct mmc_card *card, unsigned int fn)
61{
62 int ret;
63 struct sdio_func *func;
64
65 BUG_ON(fn > SDIO_MAX_FUNCS);
66
67 func = sdio_alloc_func(card);
68 if (IS_ERR(func))
69 return PTR_ERR(func);
70
71 func->num = fn;
72
73 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
74 ret = sdio_read_fbr(func);
75 if (ret)
76 goto fail;
77
78 ret = sdio_read_func_cis(func);
79 if (ret)
80 goto fail;
81 } else {
82 func->vendor = func->card->cis.vendor;
83 func->device = func->card->cis.device;
84 func->max_blksize = func->card->cis.blksize;
85 }
86
87 card->sdio_func[fn - 1] = func;
88
89 return 0;
90
91fail:
92 /*
93 * It is okay to remove the function here even though we hold
94 * the host lock as we haven't registered the device yet.
95 */
96 sdio_remove_func(func);
97 return ret;
98}
99
100static int sdio_read_cccr(struct mmc_card *card)
101{
102 int ret;
103 int cccr_vsn;
104 unsigned char data;
105
106 memset(&card->cccr, 0, sizeof(struct sdio_cccr));
107
108 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
109 if (ret)
110 goto out;
111
112 cccr_vsn = data & 0x0f;
113
114 if (cccr_vsn > SDIO_CCCR_REV_1_20) {
115 printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
116 mmc_hostname(card->host), cccr_vsn);
117 return -EINVAL;
118 }
119
120 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
121
122 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
123 if (ret)
124 goto out;
125
126 if (data & SDIO_CCCR_CAP_SMB)
127 card->cccr.multi_block = 1;
128 if (data & SDIO_CCCR_CAP_LSC)
129 card->cccr.low_speed = 1;
130 if (data & SDIO_CCCR_CAP_4BLS)
131 card->cccr.wide_bus = 1;
132
133 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
134 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
135 if (ret)
136 goto out;
137
138 if (data & SDIO_POWER_SMPC)
139 card->cccr.high_power = 1;
140 }
141
142 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
143 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
144 if (ret)
145 goto out;
146
147 if (data & SDIO_SPEED_SHS)
148 card->cccr.high_speed = 1;
149 }
150
151out:
152 return ret;
153}
154
155static int sdio_enable_wide(struct mmc_card *card)
156{
157 int ret;
158 u8 ctrl;
159
160 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
161 return 0;
162
163 if (card->cccr.low_speed && !card->cccr.wide_bus)
164 return 0;
165
166 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
167 if (ret)
168 return ret;
169
170 ctrl |= SDIO_BUS_WIDTH_4BIT;
171
172 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
173 if (ret)
174 return ret;
175
176 return 1;
177}
178
179/*
180 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
181 * of the card. This may be required on certain setups of boards,
182 * controllers and embedded sdio device which do not need the card's
183 * pull-up. As a result, card detection is disabled and power is saved.
184 */
185static int sdio_disable_cd(struct mmc_card *card)
186{
187 int ret;
188 u8 ctrl;
189
190 if (!mmc_card_disable_cd(card))
191 return 0;
192
193 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
194 if (ret)
195 return ret;
196
197 ctrl |= SDIO_BUS_CD_DISABLE;
198
199 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
200}
201
202/*
203 * Devices that remain active during a system suspend are
204 * put back into 1-bit mode.
205 */
206static int sdio_disable_wide(struct mmc_card *card)
207{
208 int ret;
209 u8 ctrl;
210
211 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
212 return 0;
213
214 if (card->cccr.low_speed && !card->cccr.wide_bus)
215 return 0;
216
217 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
218 if (ret)
219 return ret;
220
221 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
222 return 0;
223
224 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
225 ctrl |= SDIO_BUS_ASYNC_INT;
226
227 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
228 if (ret)
229 return ret;
230
231 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
232
233 return 0;
234}
235
236
237static int sdio_enable_4bit_bus(struct mmc_card *card)
238{
239 int err;
240
241 if (card->type == MMC_TYPE_SDIO)
242 return sdio_enable_wide(card);
243
244 if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
245 (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
246 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
247 if (err)
248 return err;
249 } else
250 return 0;
251
252 err = sdio_enable_wide(card);
253 if (err <= 0)
254 mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
255
256 return err;
257}
258
259
260/*
261 * Test if the card supports high-speed mode and, if so, switch to it.
262 */
263static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
264{
265 int ret;
266 u8 speed;
267
268 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
269 return 0;
270
271 if (!card->cccr.high_speed)
272 return 0;
273
274 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
275 if (ret)
276 return ret;
277
278 if (enable)
279 speed |= SDIO_SPEED_EHS;
280 else
281 speed &= ~SDIO_SPEED_EHS;
282
283 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
284 if (ret)
285 return ret;
286
287 return 1;
288}
289
290/*
291 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
292 */
293static int sdio_enable_hs(struct mmc_card *card)
294{
295 int ret;
296
297 ret = mmc_sdio_switch_hs(card, true);
298 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
299 return ret;
300
301 ret = mmc_sd_switch_hs(card);
302 if (ret <= 0)
303 mmc_sdio_switch_hs(card, false);
304
305 return ret;
306}
307
308static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
309{
310 unsigned max_dtr;
311
312 if (mmc_card_highspeed(card)) {
313 /*
314 * The SDIO specification doesn't mention how
315 * the CIS transfer speed register relates to
316 * high-speed, but it seems that 50 MHz is
317 * mandatory.
318 */
319 max_dtr = 50000000;
320 } else {
321 max_dtr = card->cis.max_dtr;
322 }
323
324 if (card->type == MMC_TYPE_SD_COMBO)
325 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
326
327 return max_dtr;
328}
329
330/*
331 * Handle the detection and initialisation of a card.
332 *
333 * In the case of a resume, "oldcard" will contain the card
334 * we're trying to reinitialise.
335 */
336static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
337 struct mmc_card *oldcard, int powered_resume)
338{
339 struct mmc_card *card;
340 int err;
341
342 BUG_ON(!host);
343 WARN_ON(!host->claimed);
344
345 /*
346 * Inform the card of the voltage
347 */
348 if (!powered_resume) {
349 err = mmc_send_io_op_cond(host, host->ocr, &ocr);
350 if (err)
351 goto err;
352 }
353
354 /*
355 * For SPI, enable CRC as appropriate.
356 */
357 if (mmc_host_is_spi(host)) {
358 err = mmc_spi_set_crc(host, use_spi_crc);
359 if (err)
360 goto err;
361 }
362
363 /*
364 * Allocate card structure.
365 */
366 card = mmc_alloc_card(host, NULL);
367 if (IS_ERR(card)) {
368 err = PTR_ERR(card);
369 goto err;
370 }
371
372 if ((ocr & R4_MEMORY_PRESENT) &&
373 mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
374 card->type = MMC_TYPE_SD_COMBO;
375
376 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
377 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
378 mmc_remove_card(card);
379 return -ENOENT;
380 }
381 } else {
382 card->type = MMC_TYPE_SDIO;
383
384 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
385 mmc_remove_card(card);
386 return -ENOENT;
387 }
388 }
389
390 /*
391 * Call the optional HC's init_card function to handle quirks.
392 */
393 if (host->ops->init_card)
394 host->ops->init_card(host, card);
395
396 /*
397 * For native busses: set card RCA and quit open drain mode.
398 */
399 if (!powered_resume && !mmc_host_is_spi(host)) {
400 err = mmc_send_relative_addr(host, &card->rca);
401 if (err)
402 goto remove;
403
404 /*
405 * Update oldcard with the new RCA received from the SDIO
406 * device -- we're doing this so that it's updated in the
407 * "card" struct when oldcard overwrites that later.
408 */
409 if (oldcard)
410 oldcard->rca = card->rca;
411
412 mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
413 }
414
415 /*
416 * Read CSD, before selecting the card
417 */
418 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
419 err = mmc_sd_get_csd(host, card);
420 if (err)
421 return err;
422
423 mmc_decode_cid(card);
424 }
425
426 /*
427 * Select card, as all following commands rely on that.
428 */
429 if (!powered_resume && !mmc_host_is_spi(host)) {
430 err = mmc_select_card(card);
431 if (err)
432 goto remove;
433 }
434
435 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
436 /*
437 * This is non-standard SDIO device, meaning it doesn't
438 * have any CIA (Common I/O area) registers present.
439 * It's host's responsibility to fill cccr and cis
440 * structures in init_card().
441 */
442 mmc_set_clock(host, card->cis.max_dtr);
443
444 if (card->cccr.high_speed) {
445 mmc_card_set_highspeed(card);
446 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
447 }
448
449 goto finish;
450 }
451
452 /*
453 * Read the common registers.
454 */
455 err = sdio_read_cccr(card);
456 if (err)
457 goto remove;
458
459 /*
460 * Read the common CIS tuples.
461 */
462 err = sdio_read_common_cis(card);
463 if (err)
464 goto remove;
465
466 if (oldcard) {
467 int same = (card->cis.vendor == oldcard->cis.vendor &&
468 card->cis.device == oldcard->cis.device);
469 mmc_remove_card(card);
470 if (!same)
471 return -ENOENT;
472
473 card = oldcard;
474 }
475 mmc_fixup_device(card, NULL);
476
477 if (card->type == MMC_TYPE_SD_COMBO) {
478 err = mmc_sd_setup_card(host, card, oldcard != NULL);
479 /* handle as SDIO-only card if memory init failed */
480 if (err) {
481 mmc_go_idle(host);
482 if (mmc_host_is_spi(host))
483 /* should not fail, as it worked previously */
484 mmc_spi_set_crc(host, use_spi_crc);
485 card->type = MMC_TYPE_SDIO;
486 } else
487 card->dev.type = &sd_type;
488 }
489
490 /*
491 * If needed, disconnect card detection pull-up resistor.
492 */
493 err = sdio_disable_cd(card);
494 if (err)
495 goto remove;
496
497 /*
498 * Switch to high-speed (if supported).
499 */
500 err = sdio_enable_hs(card);
501 if (err > 0)
502 mmc_sd_go_highspeed(card);
503 else if (err)
504 goto remove;
505
506 /*
507 * Change to the card's maximum speed.
508 */
509 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
510
511 /*
512 * Switch to wider bus (if supported).
513 */
514 err = sdio_enable_4bit_bus(card);
515 if (err > 0)
516 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
517 else if (err)
518 goto remove;
519
520finish:
521 if (!oldcard)
522 host->card = card;
523 return 0;
524
525remove:
526 if (!oldcard)
527 mmc_remove_card(card);
528
529err:
530 return err;
531}
532
533/*
534 * Host is being removed. Free up the current card.
535 */
536static void mmc_sdio_remove(struct mmc_host *host)
537{
538 int i;
539
540 BUG_ON(!host);
541 BUG_ON(!host->card);
542
543 for (i = 0;i < host->card->sdio_funcs;i++) {
544 if (host->card->sdio_func[i]) {
545 sdio_remove_func(host->card->sdio_func[i]);
546 host->card->sdio_func[i] = NULL;
547 }
548 }
549
550 mmc_remove_card(host->card);
551 host->card = NULL;
552}
553
554/*
555 * Card detection callback from host.
556 */
557static void mmc_sdio_detect(struct mmc_host *host)
558{
559 int err;
560
561 BUG_ON(!host);
562 BUG_ON(!host->card);
563
564 /* Make sure card is powered before detecting it */
565 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
566 err = pm_runtime_get_sync(&host->card->dev);
567 if (err < 0)
568 goto out;
569 }
570
571 mmc_claim_host(host);
572
573 /*
574 * Just check if our card has been removed.
575 */
576 err = mmc_select_card(host->card);
577
578 mmc_release_host(host);
579
580 /*
581 * Tell PM core it's OK to power off the card now.
582 *
583 * The _sync variant is used in order to ensure that the card
584 * is left powered off in case an error occurred, and the card
585 * is going to be removed.
586 *
587 * Since there is no specific reason to believe a new user
588 * is about to show up at this point, the _sync variant is
589 * desirable anyway.
590 */
591 if (host->caps & MMC_CAP_POWER_OFF_CARD)
592 pm_runtime_put_sync(&host->card->dev);
593
594out:
595 if (err) {
596 mmc_sdio_remove(host);
597
598 mmc_claim_host(host);
599 mmc_detach_bus(host);
600 mmc_release_host(host);
601 }
602}
603
604/*
605 * SDIO suspend. We need to suspend all functions separately.
606 * Therefore all registered functions must have drivers with suspend
607 * and resume methods. Failing that we simply remove the whole card.
608 */
609static int mmc_sdio_suspend(struct mmc_host *host)
610{
611 int i, err = 0;
612
613 for (i = 0; i < host->card->sdio_funcs; i++) {
614 struct sdio_func *func = host->card->sdio_func[i];
615 if (func && sdio_func_present(func) && func->dev.driver) {
616 const struct dev_pm_ops *pmops = func->dev.driver->pm;
617 if (!pmops || !pmops->suspend || !pmops->resume) {
618 /* force removal of entire card in that case */
619 err = -ENOSYS;
620 } else
621 err = pmops->suspend(&func->dev);
622 if (err)
623 break;
624 }
625 }
626 while (err && --i >= 0) {
627 struct sdio_func *func = host->card->sdio_func[i];
628 if (func && sdio_func_present(func) && func->dev.driver) {
629 const struct dev_pm_ops *pmops = func->dev.driver->pm;
630 pmops->resume(&func->dev);
631 }
632 }
633
634 if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
635 mmc_claim_host(host);
636 sdio_disable_wide(host->card);
637 mmc_release_host(host);
638 }
639
640 return err;
641}
642
643static int mmc_sdio_resume(struct mmc_host *host)
644{
645 int i, err = 0;
646
647 BUG_ON(!host);
648 BUG_ON(!host->card);
649
650 /* Basic card reinitialization. */
651 mmc_claim_host(host);
652
653 /* No need to reinitialize powered-resumed nonremovable cards */
654 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
655 err = mmc_sdio_init_card(host, host->ocr, host->card,
656 mmc_card_keep_power(host));
657 else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
658 /* We may have switched to 1-bit mode during suspend */
659 err = sdio_enable_4bit_bus(host->card);
660 if (err > 0) {
661 mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
662 err = 0;
663 }
664 }
665
666 if (!err && host->sdio_irqs)
667 mmc_signal_sdio_irq(host);
668 mmc_release_host(host);
669
670 /*
671 * If the card looked to be the same as before suspending, then
672 * we proceed to resume all card functions. If one of them returns
673 * an error then we simply return that error to the core and the
674 * card will be redetected as new. It is the responsibility of
675 * the function driver to perform further tests with the extra
676 * knowledge it has of the card to confirm the card is indeed the
677 * same as before suspending (same MAC address for network cards,
678 * etc.) and return an error otherwise.
679 */
680 for (i = 0; !err && i < host->card->sdio_funcs; i++) {
681 struct sdio_func *func = host->card->sdio_func[i];
682 if (func && sdio_func_present(func) && func->dev.driver) {
683 const struct dev_pm_ops *pmops = func->dev.driver->pm;
684 err = pmops->resume(&func->dev);
685 }
686 }
687
688 return err;
689}
690
691static int mmc_sdio_power_restore(struct mmc_host *host)
692{
693 int ret;
694 u32 ocr;
695
696 BUG_ON(!host);
697 BUG_ON(!host->card);
698
699 mmc_claim_host(host);
700
701 /*
702 * Reset the card by performing the same steps that are taken by
703 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
704 *
705 * sdio_reset() is technically not needed. Having just powered up the
706 * hardware, it should already be in reset state. However, some
707 * platforms (such as SD8686 on OLPC) do not instantly cut power,
708 * meaning that a reset is required when restoring power soon after
709 * powering off. It is harmless in other cases.
710 *
711 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
712 * is not necessary for non-removable cards. However, it is required
713 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
714 * harmless in other situations.
715 *
716 * With these steps taken, mmc_select_voltage() is also required to
717 * restore the correct voltage setting of the card.
718 */
719 sdio_reset(host);
720 mmc_go_idle(host);
721 mmc_send_if_cond(host, host->ocr_avail);
722
723 ret = mmc_send_io_op_cond(host, 0, &ocr);
724 if (ret)
725 goto out;
726
727 if (host->ocr_avail_sdio)
728 host->ocr_avail = host->ocr_avail_sdio;
729
730 host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
731 if (!host->ocr) {
732 ret = -EINVAL;
733 goto out;
734 }
735
736 ret = mmc_sdio_init_card(host, host->ocr, host->card,
737 mmc_card_keep_power(host));
738 if (!ret && host->sdio_irqs)
739 mmc_signal_sdio_irq(host);
740
741out:
742 mmc_release_host(host);
743
744 return ret;
745}
746
747static const struct mmc_bus_ops mmc_sdio_ops = {
748 .remove = mmc_sdio_remove,
749 .detect = mmc_sdio_detect,
750 .suspend = mmc_sdio_suspend,
751 .resume = mmc_sdio_resume,
752 .power_restore = mmc_sdio_power_restore,
753};
754
755
756/*
757 * Starting point for SDIO card init.
758 */
759int mmc_attach_sdio(struct mmc_host *host)
760{
761 int err, i, funcs;
762 u32 ocr;
763 struct mmc_card *card;
764
765 BUG_ON(!host);
766 WARN_ON(!host->claimed);
767
768 err = mmc_send_io_op_cond(host, 0, &ocr);
769 if (err)
770 return err;
771
772 mmc_attach_bus(host, &mmc_sdio_ops);
773 if (host->ocr_avail_sdio)
774 host->ocr_avail = host->ocr_avail_sdio;
775
776 /*
777 * Sanity check the voltages that the card claims to
778 * support.
779 */
780 if (ocr & 0x7F) {
781 printk(KERN_WARNING "%s: card claims to support voltages "
782 "below the defined range. These will be ignored.\n",
783 mmc_hostname(host));
784 ocr &= ~0x7F;
785 }
786
787 host->ocr = mmc_select_voltage(host, ocr);
788
789 /*
790 * Can we support the voltage(s) of the card(s)?
791 */
792 if (!host->ocr) {
793 err = -EINVAL;
794 goto err;
795 }
796
797 /*
798 * Detect and init the card.
799 */
800 err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
801 if (err)
802 goto err;
803 card = host->card;
804
805 /*
806 * Enable runtime PM only if supported by host+card+board
807 */
808 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
809 /*
810 * Let runtime PM core know our card is active
811 */
812 err = pm_runtime_set_active(&card->dev);
813 if (err)
814 goto remove;
815
816 /*
817 * Enable runtime PM for this card
818 */
819 pm_runtime_enable(&card->dev);
820 }
821
822 /*
823 * The number of functions on the card is encoded inside
824 * the ocr.
825 */
826 funcs = (ocr & 0x70000000) >> 28;
827 card->sdio_funcs = 0;
828
829 /*
830 * Initialize (but don't add) all present functions.
831 */
832 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
833 err = sdio_init_func(host->card, i + 1);
834 if (err)
835 goto remove;
836
837 /*
838 * Enable Runtime PM for this func (if supported)
839 */
840 if (host->caps & MMC_CAP_POWER_OFF_CARD)
841 pm_runtime_enable(&card->sdio_func[i]->dev);
842 }
843
844 /*
845 * First add the card to the driver model...
846 */
847 mmc_release_host(host);
848 err = mmc_add_card(host->card);
849 if (err)
850 goto remove_added;
851
852 /*
853 * ...then the SDIO functions.
854 */
855 for (i = 0;i < funcs;i++) {
856 err = sdio_add_func(host->card->sdio_func[i]);
857 if (err)
858 goto remove_added;
859 }
860
861 mmc_claim_host(host);
862 return 0;
863
864
865remove_added:
866 /* Remove without lock if the device has been added. */
867 mmc_sdio_remove(host);
868 mmc_claim_host(host);
869remove:
870 /* And with lock if it hasn't been added. */
871 mmc_release_host(host);
872 if (host->card)
873 mmc_sdio_remove(host);
874 mmc_claim_host(host);
875err:
876 mmc_detach_bus(host);
877
878 printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
879 mmc_hostname(host), err);
880
881 return err;
882}
883