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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / mmc / core / sdio.c
blob694a212cbe25ab307bf9e1af966ffd31f498fb65
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * linux/drivers/mmc/sdio.c
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8 #include <linux/err.h>
9 #include <linux/pm_runtime.h>
10
11 #include <linux/mmc/host.h>
12 #include <linux/mmc/card.h>
13 #include <linux/mmc/mmc.h>
14 #include <linux/mmc/sdio.h>
15 #include <linux/mmc/sdio_func.h>
16 #include <linux/mmc/sdio_ids.h>
17
18 #include "core.h"
19 #include "card.h"
20 #include "host.h"
21 #include "bus.h"
22 #include "quirks.h"
23 #include "sd.h"
24 #include "sdio_bus.h"
25 #include "mmc_ops.h"
26 #include "sd_ops.h"
27 #include "sdio_ops.h"
28 #include "sdio_cis.h"
29
30 MMC_DEV_ATTR(vendor, "0x%04x\n", card->cis.vendor);
31 MMC_DEV_ATTR(device, "0x%04x\n", card->cis.device);
32 MMC_DEV_ATTR(revision, "%u.%u\n", card->major_rev, card->minor_rev);
33 MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
34 MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
35
36 #define sdio_info_attr(num) \
37 static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38 { \
39 struct mmc_card *card = mmc_dev_to_card(dev); \
40 \
41 if (num > card->num_info) \
42 return -ENODATA; \
43 if (!card->info[num-1][0]) \
44 return 0; \
45 return sprintf(buf, "%s\n", card->info[num-1]); \
46 } \
47 static DEVICE_ATTR_RO(info##num)
48
49 sdio_info_attr(1);
50 sdio_info_attr(2);
51 sdio_info_attr(3);
52 sdio_info_attr(4);
53
54 static struct attribute *sdio_std_attrs[] = {
55 &dev_attr_vendor.attr,
56 &dev_attr_device.attr,
57 &dev_attr_revision.attr,
58 &dev_attr_info1.attr,
59 &dev_attr_info2.attr,
60 &dev_attr_info3.attr,
61 &dev_attr_info4.attr,
62 &dev_attr_ocr.attr,
63 &dev_attr_rca.attr,
64 NULL,
65 };
66 ATTRIBUTE_GROUPS(sdio_std);
67
68 static struct device_type sdio_type = {
69 .groups = sdio_std_groups,
70 };
71
72 static int sdio_read_fbr(struct sdio_func *func)
73 {
74 int ret;
75 unsigned char data;
76
77 if (mmc_card_nonstd_func_interface(func->card)) {
78 func->class = SDIO_CLASS_NONE;
79 return 0;
80 }
81
82 ret = mmc_io_rw_direct(func->card, 0, 0,
83 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
84 if (ret)
85 goto out;
86
87 data &= 0x0f;
88
89 if (data == 0x0f) {
90 ret = mmc_io_rw_direct(func->card, 0, 0,
91 SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
92 if (ret)
93 goto out;
94 }
95
96 func->class = data;
97
98 out:
99 return ret;
100 }
101
102 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
103 {
104 int ret;
105 struct sdio_func *func;
106
107 if (WARN_ON(fn > SDIO_MAX_FUNCS))
108 return -EINVAL;
109
110 func = sdio_alloc_func(card);
111 if (IS_ERR(func))
112 return PTR_ERR(func);
113
114 func->num = fn;
115
116 if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
117 ret = sdio_read_fbr(func);
118 if (ret)
119 goto fail;
120
121 ret = sdio_read_func_cis(func);
122 if (ret)
123 goto fail;
124 } else {
125 func->vendor = func->card->cis.vendor;
126 func->device = func->card->cis.device;
127 func->max_blksize = func->card->cis.blksize;
128 }
129
130 card->sdio_func[fn - 1] = func;
131
132 return 0;
133
134 fail:
135 /*
136 * It is okay to remove the function here even though we hold
137 * the host lock as we haven't registered the device yet.
138 */
139 sdio_remove_func(func);
140 return ret;
141 }
142
143 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
144 {
145 int ret;
146 int cccr_vsn;
147 int uhs = ocr & R4_18V_PRESENT;
148 unsigned char data;
149 unsigned char speed;
150
151 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
152 if (ret)
153 goto out;
154
155 cccr_vsn = data & 0x0f;
156
157 if (cccr_vsn > SDIO_CCCR_REV_3_00) {
158 pr_err("%s: unrecognised CCCR structure version %d\n",
159 mmc_hostname(card->host), cccr_vsn);
160 return -EINVAL;
161 }
162
163 card->cccr.sdio_vsn = (data & 0xf0) >> 4;
164
165 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
166 if (ret)
167 goto out;
168
169 if (data & SDIO_CCCR_CAP_SMB)
170 card->cccr.multi_block = 1;
171 if (data & SDIO_CCCR_CAP_LSC)
172 card->cccr.low_speed = 1;
173 if (data & SDIO_CCCR_CAP_4BLS)
174 card->cccr.wide_bus = 1;
175
176 if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
177 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
178 if (ret)
179 goto out;
180
181 if (data & SDIO_POWER_SMPC)
182 card->cccr.high_power = 1;
183 }
184
185 if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
186 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
187 if (ret)
188 goto out;
189
190 card->scr.sda_spec3 = 0;
191 card->sw_caps.sd3_bus_mode = 0;
192 card->sw_caps.sd3_drv_type = 0;
193 if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
194 card->scr.sda_spec3 = 1;
195 ret = mmc_io_rw_direct(card, 0, 0,
196 SDIO_CCCR_UHS, 0, &data);
197 if (ret)
198 goto out;
199
200 if (mmc_host_uhs(card->host)) {
201 if (data & SDIO_UHS_DDR50)
202 card->sw_caps.sd3_bus_mode
203 |= SD_MODE_UHS_DDR50 | SD_MODE_UHS_SDR50
204 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
205
206 if (data & SDIO_UHS_SDR50)
207 card->sw_caps.sd3_bus_mode
208 |= SD_MODE_UHS_SDR50 | SD_MODE_UHS_SDR25
209 | SD_MODE_UHS_SDR12;
210
211 if (data & SDIO_UHS_SDR104)
212 card->sw_caps.sd3_bus_mode
213 |= SD_MODE_UHS_SDR104 | SD_MODE_UHS_SDR50
214 | SD_MODE_UHS_SDR25 | SD_MODE_UHS_SDR12;
215 }
216
217 ret = mmc_io_rw_direct(card, 0, 0,
218 SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
219 if (ret)
220 goto out;
221
222 if (data & SDIO_DRIVE_SDTA)
223 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
224 if (data & SDIO_DRIVE_SDTC)
225 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
226 if (data & SDIO_DRIVE_SDTD)
227 card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
228 }
229
230 /* if no uhs mode ensure we check for high speed */
231 if (!card->sw_caps.sd3_bus_mode) {
232 if (speed & SDIO_SPEED_SHS) {
233 card->cccr.high_speed = 1;
234 card->sw_caps.hs_max_dtr = 50000000;
235 } else {
236 card->cccr.high_speed = 0;
237 card->sw_caps.hs_max_dtr = 25000000;
238 }
239 }
240 }
241
242 out:
243 return ret;
244 }
245
246 static int sdio_enable_wide(struct mmc_card *card)
247 {
248 int ret;
249 u8 ctrl;
250
251 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
252 return 0;
253
254 if (card->cccr.low_speed && !card->cccr.wide_bus)
255 return 0;
256
257 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
258 if (ret)
259 return ret;
260
261 if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
262 pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
263 mmc_hostname(card->host), ctrl);
264
265 /* set as 4-bit bus width */
266 ctrl &= ~SDIO_BUS_WIDTH_MASK;
267 ctrl |= SDIO_BUS_WIDTH_4BIT;
268
269 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
270 if (ret)
271 return ret;
272
273 return 1;
274 }
275
276 /*
277 * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
278 * of the card. This may be required on certain setups of boards,
279 * controllers and embedded sdio device which do not need the card's
280 * pull-up. As a result, card detection is disabled and power is saved.
281 */
282 static int sdio_disable_cd(struct mmc_card *card)
283 {
284 int ret;
285 u8 ctrl;
286
287 if (!mmc_card_disable_cd(card))
288 return 0;
289
290 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
291 if (ret)
292 return ret;
293
294 ctrl |= SDIO_BUS_CD_DISABLE;
295
296 return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
297 }
298
299 /*
300 * Devices that remain active during a system suspend are
301 * put back into 1-bit mode.
302 */
303 static int sdio_disable_wide(struct mmc_card *card)
304 {
305 int ret;
306 u8 ctrl;
307
308 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
309 return 0;
310
311 if (card->cccr.low_speed && !card->cccr.wide_bus)
312 return 0;
313
314 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
315 if (ret)
316 return ret;
317
318 if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
319 return 0;
320
321 ctrl &= ~SDIO_BUS_WIDTH_4BIT;
322 ctrl |= SDIO_BUS_ASYNC_INT;
323
324 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
325 if (ret)
326 return ret;
327
328 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
329
330 return 0;
331 }
332
333 static int sdio_disable_4bit_bus(struct mmc_card *card)
334 {
335 int err;
336
337 if (card->type == MMC_TYPE_SDIO)
338 goto out;
339
340 if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
341 return 0;
342
343 if (!(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
344 return 0;
345
346 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
347 if (err)
348 return err;
349
350 out:
351 return sdio_disable_wide(card);
352 }
353
354
355 static int sdio_enable_4bit_bus(struct mmc_card *card)
356 {
357 int err;
358
359 err = sdio_enable_wide(card);
360 if (err <= 0)
361 return err;
362 if (card->type == MMC_TYPE_SDIO)
363 goto out;
364
365 if (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4) {
366 err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
367 if (err) {
368 sdio_disable_wide(card);
369 return err;
370 }
371 }
372 out:
373 mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
374
375 return 0;
376 }
377
378
379 /*
380 * Test if the card supports high-speed mode and, if so, switch to it.
381 */
382 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
383 {
384 int ret;
385 u8 speed;
386
387 if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
388 return 0;
389
390 if (!card->cccr.high_speed)
391 return 0;
392
393 ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
394 if (ret)
395 return ret;
396
397 if (enable)
398 speed |= SDIO_SPEED_EHS;
399 else
400 speed &= ~SDIO_SPEED_EHS;
401
402 ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
403 if (ret)
404 return ret;
405
406 return 1;
407 }
408
409 /*
410 * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
411 */
412 static int sdio_enable_hs(struct mmc_card *card)
413 {
414 int ret;
415
416 ret = mmc_sdio_switch_hs(card, true);
417 if (ret <= 0 || card->type == MMC_TYPE_SDIO)
418 return ret;
419
420 ret = mmc_sd_switch_hs(card);
421 if (ret <= 0)
422 mmc_sdio_switch_hs(card, false);
423
424 return ret;
425 }
426
427 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
428 {
429 unsigned max_dtr;
430
431 if (mmc_card_hs(card)) {
432 /*
433 * The SDIO specification doesn't mention how
434 * the CIS transfer speed register relates to
435 * high-speed, but it seems that 50 MHz is
436 * mandatory.
437 */
438 max_dtr = 50000000;
439 } else {
440 max_dtr = card->cis.max_dtr;
441 }
442
443 if (card->type == MMC_TYPE_SD_COMBO)
444 max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
445
446 return max_dtr;
447 }
448
449 static unsigned char host_drive_to_sdio_drive(int host_strength)
450 {
451 switch (host_strength) {
452 case MMC_SET_DRIVER_TYPE_A:
453 return SDIO_DTSx_SET_TYPE_A;
454 case MMC_SET_DRIVER_TYPE_B:
455 return SDIO_DTSx_SET_TYPE_B;
456 case MMC_SET_DRIVER_TYPE_C:
457 return SDIO_DTSx_SET_TYPE_C;
458 case MMC_SET_DRIVER_TYPE_D:
459 return SDIO_DTSx_SET_TYPE_D;
460 default:
461 return SDIO_DTSx_SET_TYPE_B;
462 }
463 }
464
465 static void sdio_select_driver_type(struct mmc_card *card)
466 {
467 int card_drv_type, drive_strength, drv_type;
468 unsigned char card_strength;
469 int err;
470
471 card->drive_strength = 0;
472
473 card_drv_type = card->sw_caps.sd3_drv_type | SD_DRIVER_TYPE_B;
474
475 drive_strength = mmc_select_drive_strength(card,
476 card->sw_caps.uhs_max_dtr,
477 card_drv_type, &drv_type);
478
479 if (drive_strength) {
480 /* if error just use default for drive strength B */
481 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
482 &card_strength);
483 if (err)
484 return;
485
486 card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
487 card_strength |= host_drive_to_sdio_drive(drive_strength);
488
489 /* if error default to drive strength B */
490 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
491 card_strength, NULL);
492 if (err)
493 return;
494 card->drive_strength = drive_strength;
495 }
496
497 if (drv_type)
498 mmc_set_driver_type(card->host, drv_type);
499 }
500
501
502 static int sdio_set_bus_speed_mode(struct mmc_card *card)
503 {
504 unsigned int bus_speed, timing;
505 int err;
506 unsigned char speed;
507 unsigned int max_rate;
508
509 /*
510 * If the host doesn't support any of the UHS-I modes, fallback on
511 * default speed.
512 */
513 if (!mmc_host_uhs(card->host))
514 return 0;
515
516 bus_speed = SDIO_SPEED_SDR12;
517 timing = MMC_TIMING_UHS_SDR12;
518 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
519 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
520 bus_speed = SDIO_SPEED_SDR104;
521 timing = MMC_TIMING_UHS_SDR104;
522 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
523 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
524 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
525 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
526 bus_speed = SDIO_SPEED_DDR50;
527 timing = MMC_TIMING_UHS_DDR50;
528 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
529 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
530 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
531 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
532 SD_MODE_UHS_SDR50)) {
533 bus_speed = SDIO_SPEED_SDR50;
534 timing = MMC_TIMING_UHS_SDR50;
535 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
536 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
537 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
538 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
539 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
540 bus_speed = SDIO_SPEED_SDR25;
541 timing = MMC_TIMING_UHS_SDR25;
542 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
543 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
544 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
545 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
546 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
547 SD_MODE_UHS_SDR12)) {
548 bus_speed = SDIO_SPEED_SDR12;
549 timing = MMC_TIMING_UHS_SDR12;
550 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
551 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
552 }
553
554 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
555 if (err)
556 return err;
557
558 speed &= ~SDIO_SPEED_BSS_MASK;
559 speed |= bus_speed;
560 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
561 if (err)
562 return err;
563
564 max_rate = min_not_zero(card->quirk_max_rate,
565 card->sw_caps.uhs_max_dtr);
566
567 mmc_set_timing(card->host, timing);
568 mmc_set_clock(card->host, max_rate);
569
570 return 0;
571 }
572
573 /*
574 * UHS-I specific initialization procedure
575 */
576 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
577 {
578 int err;
579
580 if (!card->scr.sda_spec3)
581 return 0;
582
583 /* Switch to wider bus */
584 err = sdio_enable_4bit_bus(card);
585 if (err)
586 goto out;
587
588 /* Set the driver strength for the card */
589 sdio_select_driver_type(card);
590
591 /* Set bus speed mode of the card */
592 err = sdio_set_bus_speed_mode(card);
593 if (err)
594 goto out;
595
596 /*
597 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
598 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
599 */
600 if (!mmc_host_is_spi(card->host) &&
601 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
602 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
603 err = mmc_execute_tuning(card);
604 out:
605 return err;
606 }
607
608 static int mmc_sdio_pre_init(struct mmc_host *host, u32 ocr,
609 struct mmc_card *card)
610 {
611 if (card)
612 mmc_remove_card(card);
613
614 /*
615 * Reset the card by performing the same steps that are taken by
616 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
617 *
618 * sdio_reset() is technically not needed. Having just powered up the
619 * hardware, it should already be in reset state. However, some
620 * platforms (such as SD8686 on OLPC) do not instantly cut power,
621 * meaning that a reset is required when restoring power soon after
622 * powering off. It is harmless in other cases.
623 *
624 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
625 * is not necessary for non-removable cards. However, it is required
626 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
627 * harmless in other situations.
628 *
629 */
630
631 sdio_reset(host);
632 mmc_go_idle(host);
633 mmc_send_if_cond(host, ocr);
634 return mmc_send_io_op_cond(host, 0, NULL);
635 }
636
637 /*
638 * Handle the detection and initialisation of a card.
639 *
640 * In the case of a resume, "oldcard" will contain the card
641 * we're trying to reinitialise.
642 */
643 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
644 struct mmc_card *oldcard)
645 {
646 struct mmc_card *card;
647 int err;
648 int retries = 10;
649 u32 rocr = 0;
650 u32 ocr_card = ocr;
651
652 WARN_ON(!host->claimed);
653
654 /* to query card if 1.8V signalling is supported */
655 if (mmc_host_uhs(host))
656 ocr |= R4_18V_PRESENT;
657
658 try_again:
659 if (!retries) {
660 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
661 ocr &= ~R4_18V_PRESENT;
662 }
663
664 /*
665 * Inform the card of the voltage
666 */
667 err = mmc_send_io_op_cond(host, ocr, &rocr);
668 if (err)
669 return err;
670
671 /*
672 * For SPI, enable CRC as appropriate.
673 */
674 if (mmc_host_is_spi(host)) {
675 err = mmc_spi_set_crc(host, use_spi_crc);
676 if (err)
677 return err;
678 }
679
680 /*
681 * Allocate card structure.
682 */
683 card = mmc_alloc_card(host, &sdio_type);
684 if (IS_ERR(card))
685 return PTR_ERR(card);
686
687 if ((rocr & R4_MEMORY_PRESENT) &&
688 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
689 card->type = MMC_TYPE_SD_COMBO;
690
691 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
692 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
693 err = -ENOENT;
694 goto mismatch;
695 }
696 } else {
697 card->type = MMC_TYPE_SDIO;
698
699 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
700 err = -ENOENT;
701 goto mismatch;
702 }
703 }
704
705 /*
706 * Call the optional HC's init_card function to handle quirks.
707 */
708 if (host->ops->init_card)
709 host->ops->init_card(host, card);
710
711 /*
712 * If the host and card support UHS-I mode request the card
713 * to switch to 1.8V signaling level. No 1.8v signalling if
714 * UHS mode is not enabled to maintain compatibility and some
715 * systems that claim 1.8v signalling in fact do not support
716 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
717 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
718 * fails to check rocr & R4_18V_PRESENT, but we still need to
719 * try to init uhs card. sdio_read_cccr will take over this task
720 * to make sure which speed mode should work.
721 */
722 if (rocr & ocr & R4_18V_PRESENT) {
723 err = mmc_set_uhs_voltage(host, ocr_card);
724 if (err == -EAGAIN) {
725 mmc_sdio_pre_init(host, ocr_card, card);
726 retries--;
727 goto try_again;
728 } else if (err) {
729 ocr &= ~R4_18V_PRESENT;
730 }
731 }
732
733 /*
734 * For native busses: set card RCA and quit open drain mode.
735 */
736 if (!mmc_host_is_spi(host)) {
737 err = mmc_send_relative_addr(host, &card->rca);
738 if (err)
739 goto remove;
740
741 /*
742 * Update oldcard with the new RCA received from the SDIO
743 * device -- we're doing this so that it's updated in the
744 * "card" struct when oldcard overwrites that later.
745 */
746 if (oldcard)
747 oldcard->rca = card->rca;
748 }
749
750 /*
751 * Read CSD, before selecting the card
752 */
753 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
754 err = mmc_sd_get_csd(host, card);
755 if (err)
756 goto remove;
757
758 mmc_decode_cid(card);
759 }
760
761 /*
762 * Select card, as all following commands rely on that.
763 */
764 if (!mmc_host_is_spi(host)) {
765 err = mmc_select_card(card);
766 if (err)
767 goto remove;
768 }
769
770 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
771 /*
772 * This is non-standard SDIO device, meaning it doesn't
773 * have any CIA (Common I/O area) registers present.
774 * It's host's responsibility to fill cccr and cis
775 * structures in init_card().
776 */
777 mmc_set_clock(host, card->cis.max_dtr);
778
779 if (card->cccr.high_speed) {
780 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
781 }
782
783 if (oldcard)
784 mmc_remove_card(card);
785 else
786 host->card = card;
787
788 return 0;
789 }
790
791 /*
792 * Read the common registers. Note that we should try to
793 * validate whether UHS would work or not.
794 */
795 err = sdio_read_cccr(card, ocr);
796 if (err) {
797 mmc_sdio_pre_init(host, ocr_card, card);
798 if (ocr & R4_18V_PRESENT) {
799 /* Retry init sequence, but without R4_18V_PRESENT. */
800 retries = 0;
801 goto try_again;
802 }
803 return err;
804 }
805
806 /*
807 * Read the common CIS tuples.
808 */
809 err = sdio_read_common_cis(card);
810 if (err)
811 goto remove;
812
813 if (oldcard) {
814 if (card->cis.vendor == oldcard->cis.vendor &&
815 card->cis.device == oldcard->cis.device) {
816 mmc_remove_card(card);
817 card = oldcard;
818 } else {
819 err = -ENOENT;
820 goto mismatch;
821 }
822 }
823 card->ocr = ocr_card;
824 mmc_fixup_device(card, sdio_fixup_methods);
825
826 if (card->type == MMC_TYPE_SD_COMBO) {
827 err = mmc_sd_setup_card(host, card, oldcard != NULL);
828 /* handle as SDIO-only card if memory init failed */
829 if (err) {
830 mmc_go_idle(host);
831 if (mmc_host_is_spi(host))
832 /* should not fail, as it worked previously */
833 mmc_spi_set_crc(host, use_spi_crc);
834 card->type = MMC_TYPE_SDIO;
835 } else
836 card->dev.type = &sd_type;
837 }
838
839 /*
840 * If needed, disconnect card detection pull-up resistor.
841 */
842 err = sdio_disable_cd(card);
843 if (err)
844 goto remove;
845
846 /* Initialization sequence for UHS-I cards */
847 /* Only if card supports 1.8v and UHS signaling */
848 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
849 err = mmc_sdio_init_uhs_card(card);
850 if (err)
851 goto remove;
852 } else {
853 /*
854 * Switch to high-speed (if supported).
855 */
856 err = sdio_enable_hs(card);
857 if (err > 0)
858 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
859 else if (err)
860 goto remove;
861
862 /*
863 * Change to the card's maximum speed.
864 */
865 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
866
867 /*
868 * Switch to wider bus (if supported).
869 */
870 err = sdio_enable_4bit_bus(card);
871 if (err)
872 goto remove;
873 }
874
875 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
876 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
877 pr_err("%s: Host failed to negotiate down from 3.3V\n",
878 mmc_hostname(host));
879 err = -EINVAL;
880 goto remove;
881 }
882
883 host->card = card;
884 return 0;
885
886 mismatch:
887 pr_debug("%s: Perhaps the card was replaced\n", mmc_hostname(host));
888 remove:
889 if (oldcard != card)
890 mmc_remove_card(card);
891 return err;
892 }
893
894 static int mmc_sdio_reinit_card(struct mmc_host *host)
895 {
896 int ret;
897
898 ret = mmc_sdio_pre_init(host, host->card->ocr, NULL);
899 if (ret)
900 return ret;
901
902 return mmc_sdio_init_card(host, host->card->ocr, host->card);
903 }
904
905 /*
906 * Host is being removed. Free up the current card.
907 */
908 static void mmc_sdio_remove(struct mmc_host *host)
909 {
910 int i;
911
912 for (i = 0;i < host->card->sdio_funcs;i++) {
913 if (host->card->sdio_func[i]) {
914 sdio_remove_func(host->card->sdio_func[i]);
915 host->card->sdio_func[i] = NULL;
916 }
917 }
918
919 mmc_remove_card(host->card);
920 host->card = NULL;
921 }
922
923 /*
924 * Card detection - card is alive.
925 */
926 static int mmc_sdio_alive(struct mmc_host *host)
927 {
928 return mmc_select_card(host->card);
929 }
930
931 /*
932 * Card detection callback from host.
933 */
934 static void mmc_sdio_detect(struct mmc_host *host)
935 {
936 int err;
937
938 /* Make sure card is powered before detecting it */
939 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
940 err = pm_runtime_get_sync(&host->card->dev);
941 if (err < 0) {
942 pm_runtime_put_noidle(&host->card->dev);
943 goto out;
944 }
945 }
946
947 mmc_claim_host(host);
948
949 /*
950 * Just check if our card has been removed.
951 */
952 err = _mmc_detect_card_removed(host);
953
954 mmc_release_host(host);
955
956 /*
957 * Tell PM core it's OK to power off the card now.
958 *
959 * The _sync variant is used in order to ensure that the card
960 * is left powered off in case an error occurred, and the card
961 * is going to be removed.
962 *
963 * Since there is no specific reason to believe a new user
964 * is about to show up at this point, the _sync variant is
965 * desirable anyway.
966 */
967 if (host->caps & MMC_CAP_POWER_OFF_CARD)
968 pm_runtime_put_sync(&host->card->dev);
969
970 out:
971 if (err) {
972 mmc_sdio_remove(host);
973
974 mmc_claim_host(host);
975 mmc_detach_bus(host);
976 mmc_power_off(host);
977 mmc_release_host(host);
978 }
979 }
980
981 /*
982 * SDIO pre_suspend. We need to suspend all functions separately.
983 * Therefore all registered functions must have drivers with suspend
984 * and resume methods. Failing that we simply remove the whole card.
985 */
986 static int mmc_sdio_pre_suspend(struct mmc_host *host)
987 {
988 int i, err = 0;
989
990 for (i = 0; i < host->card->sdio_funcs; i++) {
991 struct sdio_func *func = host->card->sdio_func[i];
992 if (func && sdio_func_present(func) && func->dev.driver) {
993 const struct dev_pm_ops *pmops = func->dev.driver->pm;
994 if (!pmops || !pmops->suspend || !pmops->resume) {
995 /* force removal of entire card in that case */
996 err = -ENOSYS;
997 break;
998 }
999 }
1000 }
1001
1002 return err;
1003 }
1004
1005 /*
1006 * SDIO suspend. Suspend all functions separately.
1007 */
1008 static int mmc_sdio_suspend(struct mmc_host *host)
1009 {
1010 WARN_ON(host->sdio_irqs && !mmc_card_keep_power(host));
1011
1012 /* Prevent processing of SDIO IRQs in suspended state. */
1013 mmc_card_set_suspended(host->card);
1014 cancel_delayed_work_sync(&host->sdio_irq_work);
1015
1016 mmc_claim_host(host);
1017
1018 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
1019 sdio_disable_4bit_bus(host->card);
1020
1021 if (!mmc_card_keep_power(host)) {
1022 mmc_power_off(host);
1023 } else if (host->retune_period) {
1024 mmc_retune_timer_stop(host);
1025 mmc_retune_needed(host);
1026 }
1027
1028 mmc_release_host(host);
1029
1030 return 0;
1031 }
1032
1033 static int mmc_sdio_resume(struct mmc_host *host)
1034 {
1035 int err = 0;
1036
1037 /* Basic card reinitialization. */
1038 mmc_claim_host(host);
1039
1040 /*
1041 * Restore power and reinitialize the card when needed. Note that a
1042 * removable card is checked from a detect work later on in the resume
1043 * process.
1044 */
1045 if (!mmc_card_keep_power(host)) {
1046 mmc_power_up(host, host->card->ocr);
1047 /*
1048 * Tell runtime PM core we just powered up the card,
1049 * since it still believes the card is powered off.
1050 * Note that currently runtime PM is only enabled
1051 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1052 */
1053 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1054 pm_runtime_disable(&host->card->dev);
1055 pm_runtime_set_active(&host->card->dev);
1056 pm_runtime_enable(&host->card->dev);
1057 }
1058 err = mmc_sdio_reinit_card(host);
1059 } else if (mmc_card_wake_sdio_irq(host)) {
1060 /* We may have switched to 1-bit mode during suspend */
1061 err = sdio_enable_4bit_bus(host->card);
1062 }
1063
1064 if (err)
1065 goto out;
1066
1067 /* Allow SDIO IRQs to be processed again. */
1068 mmc_card_clr_suspended(host->card);
1069
1070 if (host->sdio_irqs) {
1071 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
1072 wake_up_process(host->sdio_irq_thread);
1073 else if (host->caps & MMC_CAP_SDIO_IRQ)
1074 queue_delayed_work(system_wq, &host->sdio_irq_work, 0);
1075 }
1076
1077 out:
1078 mmc_release_host(host);
1079
1080 host->pm_flags &= ~MMC_PM_KEEP_POWER;
1081 return err;
1082 }
1083
1084 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1085 {
1086 /* No references to the card, cut the power to it. */
1087 mmc_claim_host(host);
1088 mmc_power_off(host);
1089 mmc_release_host(host);
1090
1091 return 0;
1092 }
1093
1094 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1095 {
1096 int ret;
1097
1098 /* Restore power and re-initialize. */
1099 mmc_claim_host(host);
1100 mmc_power_up(host, host->card->ocr);
1101 ret = mmc_sdio_reinit_card(host);
1102 mmc_release_host(host);
1103
1104 return ret;
1105 }
1106
1107 /*
1108 * SDIO HW reset
1109 *
1110 * Returns 0 if the HW reset was executed synchronously, returns 1 if the HW
1111 * reset was asynchronously scheduled, else a negative error code.
1112 */
1113 static int mmc_sdio_hw_reset(struct mmc_host *host)
1114 {
1115 struct mmc_card *card = host->card;
1116
1117 /*
1118 * In case the card is shared among multiple func drivers, reset the
1119 * card through a rescan work. In this way it will be removed and
1120 * re-detected, thus all func drivers becomes informed about it.
1121 */
1122 if (atomic_read(&card->sdio_funcs_probed) > 1) {
1123 if (mmc_card_removed(card))
1124 return 1;
1125 host->rescan_entered = 0;
1126 mmc_card_set_removed(card);
1127 _mmc_detect_change(host, 0, false);
1128 return 1;
1129 }
1130
1131 /*
1132 * A single func driver has been probed, then let's skip the heavy
1133 * hotplug dance above and execute the reset immediately.
1134 */
1135 mmc_power_cycle(host, card->ocr);
1136 return mmc_sdio_reinit_card(host);
1137 }
1138
1139 static int mmc_sdio_sw_reset(struct mmc_host *host)
1140 {
1141 mmc_set_clock(host, host->f_init);
1142 sdio_reset(host);
1143 mmc_go_idle(host);
1144
1145 mmc_set_initial_state(host);
1146 mmc_set_initial_signal_voltage(host);
1147
1148 return mmc_sdio_reinit_card(host);
1149 }
1150
1151 static const struct mmc_bus_ops mmc_sdio_ops = {
1152 .remove = mmc_sdio_remove,
1153 .detect = mmc_sdio_detect,
1154 .pre_suspend = mmc_sdio_pre_suspend,
1155 .suspend = mmc_sdio_suspend,
1156 .resume = mmc_sdio_resume,
1157 .runtime_suspend = mmc_sdio_runtime_suspend,
1158 .runtime_resume = mmc_sdio_runtime_resume,
1159 .alive = mmc_sdio_alive,
1160 .hw_reset = mmc_sdio_hw_reset,
1161 .sw_reset = mmc_sdio_sw_reset,
1162 };
1163
1164
1165 /*
1166 * Starting point for SDIO card init.
1167 */
1168 int mmc_attach_sdio(struct mmc_host *host)
1169 {
1170 int err, i, funcs;
1171 u32 ocr, rocr;
1172 struct mmc_card *card;
1173
1174 WARN_ON(!host->claimed);
1175
1176 err = mmc_send_io_op_cond(host, 0, &ocr);
1177 if (err)
1178 return err;
1179
1180 mmc_attach_bus(host, &mmc_sdio_ops);
1181 if (host->ocr_avail_sdio)
1182 host->ocr_avail = host->ocr_avail_sdio;
1183
1184
1185 rocr = mmc_select_voltage(host, ocr);
1186
1187 /*
1188 * Can we support the voltage(s) of the card(s)?
1189 */
1190 if (!rocr) {
1191 err = -EINVAL;
1192 goto err;
1193 }
1194
1195 /*
1196 * Detect and init the card.
1197 */
1198 err = mmc_sdio_init_card(host, rocr, NULL);
1199 if (err)
1200 goto err;
1201
1202 card = host->card;
1203
1204 /*
1205 * Enable runtime PM only if supported by host+card+board
1206 */
1207 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1208 /*
1209 * Do not allow runtime suspend until after SDIO function
1210 * devices are added.
1211 */
1212 pm_runtime_get_noresume(&card->dev);
1213
1214 /*
1215 * Let runtime PM core know our card is active
1216 */
1217 err = pm_runtime_set_active(&card->dev);
1218 if (err)
1219 goto remove;
1220
1221 /*
1222 * Enable runtime PM for this card
1223 */
1224 pm_runtime_enable(&card->dev);
1225 }
1226
1227 /*
1228 * The number of functions on the card is encoded inside
1229 * the ocr.
1230 */
1231 funcs = (ocr & 0x70000000) >> 28;
1232 card->sdio_funcs = 0;
1233
1234 /*
1235 * Initialize (but don't add) all present functions.
1236 */
1237 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1238 err = sdio_init_func(host->card, i + 1);
1239 if (err)
1240 goto remove;
1241
1242 /*
1243 * Enable Runtime PM for this func (if supported)
1244 */
1245 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1246 pm_runtime_enable(&card->sdio_func[i]->dev);
1247 }
1248
1249 /*
1250 * First add the card to the driver model...
1251 */
1252 mmc_release_host(host);
1253 err = mmc_add_card(host->card);
1254 if (err)
1255 goto remove_added;
1256
1257 /*
1258 * ...then the SDIO functions.
1259 */
1260 for (i = 0;i < funcs;i++) {
1261 err = sdio_add_func(host->card->sdio_func[i]);
1262 if (err)
1263 goto remove_added;
1264 }
1265
1266 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1267 pm_runtime_put(&card->dev);
1268
1269 mmc_claim_host(host);
1270 return 0;
1271
1272
1273 remove:
1274 mmc_release_host(host);
1275 remove_added:
1276 /*
1277 * The devices are being deleted so it is not necessary to disable
1278 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1279 * because it needs to be active to remove any function devices that
1280 * were probed, and after that it gets deleted.
1281 */
1282 mmc_sdio_remove(host);
1283 mmc_claim_host(host);
1284 err:
1285 mmc_detach_bus(host);
1286
1287 pr_err("%s: error %d whilst initialising SDIO card\n",
1288 mmc_hostname(host), err);
1289
1290 return err;
1291 }
1292
Linux with added FPC-III support