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
sdio_read_fbr(struct sdio_func * func)34 static 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
60 out:
61 return ret;
62 }
63
sdio_init_func(struct mmc_card * card,unsigned int fn)64 static 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
96 fail:
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
sdio_read_cccr(struct mmc_card * card,u32 ocr)105 static 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
201 out:
202 return ret;
203 }
204
sdio_enable_wide(struct mmc_card * card)205 static 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 */
sdio_disable_cd(struct mmc_card * card)241 static 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 */
sdio_disable_wide(struct mmc_card * card)262 static 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
sdio_enable_4bit_bus(struct mmc_card * card)293 static 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 */
mmc_sdio_switch_hs(struct mmc_card * card,int enable)322 static 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 */
sdio_enable_hs(struct mmc_card * card)352 static 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
mmc_sdio_get_max_clock(struct mmc_card * card)367 static 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
host_drive_to_sdio_drive(int host_strength)389 static 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
sdio_select_driver_type(struct mmc_card * card)405 static 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
sdio_set_bus_speed_mode(struct mmc_card * card)442 static 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 unsigned int max_rate;
448
449 /*
450 * If the host doesn't support any of the UHS-I modes, fallback on
451 * default speed.
452 */
453 if (!mmc_host_uhs(card->host))
454 return 0;
455
456 bus_speed = SDIO_SPEED_SDR12;
457 timing = MMC_TIMING_UHS_SDR12;
458 if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
459 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
460 bus_speed = SDIO_SPEED_SDR104;
461 timing = MMC_TIMING_UHS_SDR104;
462 card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
463 card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
464 } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
465 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
466 bus_speed = SDIO_SPEED_DDR50;
467 timing = MMC_TIMING_UHS_DDR50;
468 card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
469 card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
470 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
471 MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
472 SD_MODE_UHS_SDR50)) {
473 bus_speed = SDIO_SPEED_SDR50;
474 timing = MMC_TIMING_UHS_SDR50;
475 card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
476 card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
477 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
478 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
479 (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
480 bus_speed = SDIO_SPEED_SDR25;
481 timing = MMC_TIMING_UHS_SDR25;
482 card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
483 card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
484 } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
485 MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
486 MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
487 SD_MODE_UHS_SDR12)) {
488 bus_speed = SDIO_SPEED_SDR12;
489 timing = MMC_TIMING_UHS_SDR12;
490 card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
491 card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
492 }
493
494 err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
495 if (err)
496 return err;
497
498 speed &= ~SDIO_SPEED_BSS_MASK;
499 speed |= bus_speed;
500 err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
501 if (err)
502 return err;
503
504 max_rate = min_not_zero(card->quirk_max_rate,
505 card->sw_caps.uhs_max_dtr);
506
507 if (bus_speed) {
508 mmc_set_timing(card->host, timing);
509 mmc_set_clock(card->host, max_rate);
510 }
511
512 return 0;
513 }
514
515 /*
516 * UHS-I specific initialization procedure
517 */
mmc_sdio_init_uhs_card(struct mmc_card * card)518 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
519 {
520 int err;
521
522 if (!card->scr.sda_spec3)
523 return 0;
524
525 /* Switch to wider bus */
526 err = sdio_enable_4bit_bus(card);
527 if (err)
528 goto out;
529
530 /* Set the driver strength for the card */
531 sdio_select_driver_type(card);
532
533 /* Set bus speed mode of the card */
534 err = sdio_set_bus_speed_mode(card);
535 if (err)
536 goto out;
537
538 /*
539 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
540 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
541 */
542 if (!mmc_host_is_spi(card->host) &&
543 ((card->host->ios.timing == MMC_TIMING_UHS_SDR50) ||
544 (card->host->ios.timing == MMC_TIMING_UHS_SDR104)))
545 err = mmc_execute_tuning(card);
546 out:
547 return err;
548 }
549
mmc_sdio_resend_if_cond(struct mmc_host * host,struct mmc_card * card)550 static void mmc_sdio_resend_if_cond(struct mmc_host *host,
551 struct mmc_card *card)
552 {
553 sdio_reset(host);
554 mmc_go_idle(host);
555 mmc_send_if_cond(host, host->ocr_avail);
556 mmc_remove_card(card);
557 }
558
559 /*
560 * Handle the detection and initialisation of a card.
561 *
562 * In the case of a resume, "oldcard" will contain the card
563 * we're trying to reinitialise.
564 */
mmc_sdio_init_card(struct mmc_host * host,u32 ocr,struct mmc_card * oldcard,int powered_resume)565 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
566 struct mmc_card *oldcard, int powered_resume)
567 {
568 struct mmc_card *card;
569 int err;
570 int retries = 10;
571 u32 rocr = 0;
572 u32 ocr_card = ocr;
573
574 WARN_ON(!host->claimed);
575
576 /* to query card if 1.8V signalling is supported */
577 if (mmc_host_uhs(host))
578 ocr |= R4_18V_PRESENT;
579
580 try_again:
581 if (!retries) {
582 pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
583 ocr &= ~R4_18V_PRESENT;
584 }
585
586 /*
587 * Inform the card of the voltage
588 */
589 if (!powered_resume) {
590 err = mmc_send_io_op_cond(host, ocr, &rocr);
591 if (err)
592 goto err;
593 }
594
595 /*
596 * For SPI, enable CRC as appropriate.
597 */
598 if (mmc_host_is_spi(host)) {
599 err = mmc_spi_set_crc(host, use_spi_crc);
600 if (err)
601 goto err;
602 }
603
604 /*
605 * Allocate card structure.
606 */
607 card = mmc_alloc_card(host, NULL);
608 if (IS_ERR(card)) {
609 err = PTR_ERR(card);
610 goto err;
611 }
612
613 if ((rocr & R4_MEMORY_PRESENT) &&
614 mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
615 card->type = MMC_TYPE_SD_COMBO;
616
617 if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
618 memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
619 mmc_remove_card(card);
620 return -ENOENT;
621 }
622 } else {
623 card->type = MMC_TYPE_SDIO;
624
625 if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
626 mmc_remove_card(card);
627 return -ENOENT;
628 }
629 }
630
631 /*
632 * Call the optional HC's init_card function to handle quirks.
633 */
634 if (host->ops->init_card)
635 host->ops->init_card(host, card);
636
637 /*
638 * If the host and card support UHS-I mode request the card
639 * to switch to 1.8V signaling level. No 1.8v signalling if
640 * UHS mode is not enabled to maintain compatibility and some
641 * systems that claim 1.8v signalling in fact do not support
642 * it. Per SDIO spec v3, section 3.1.2, if the voltage is already
643 * 1.8v, the card sets S18A to 0 in the R4 response. So it will
644 * fails to check rocr & R4_18V_PRESENT, but we still need to
645 * try to init uhs card. sdio_read_cccr will take over this task
646 * to make sure which speed mode should work.
647 */
648 if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
649 err = mmc_set_uhs_voltage(host, ocr_card);
650 if (err == -EAGAIN) {
651 mmc_sdio_resend_if_cond(host, card);
652 retries--;
653 goto try_again;
654 } else if (err) {
655 ocr &= ~R4_18V_PRESENT;
656 }
657 }
658
659 /*
660 * For native busses: set card RCA and quit open drain mode.
661 */
662 if (!powered_resume && !mmc_host_is_spi(host)) {
663 err = mmc_send_relative_addr(host, &card->rca);
664 if (err)
665 goto remove;
666
667 /*
668 * Update oldcard with the new RCA received from the SDIO
669 * device -- we're doing this so that it's updated in the
670 * "card" struct when oldcard overwrites that later.
671 */
672 if (oldcard)
673 oldcard->rca = card->rca;
674 }
675
676 /*
677 * Read CSD, before selecting the card
678 */
679 if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
680 err = mmc_sd_get_csd(host, card);
681 if (err)
682 return err;
683
684 mmc_decode_cid(card);
685 }
686
687 /*
688 * Select card, as all following commands rely on that.
689 */
690 if (!powered_resume && !mmc_host_is_spi(host)) {
691 err = mmc_select_card(card);
692 if (err)
693 goto remove;
694 }
695
696 if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
697 /*
698 * This is non-standard SDIO device, meaning it doesn't
699 * have any CIA (Common I/O area) registers present.
700 * It's host's responsibility to fill cccr and cis
701 * structures in init_card().
702 */
703 mmc_set_clock(host, card->cis.max_dtr);
704
705 if (card->cccr.high_speed) {
706 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
707 }
708
709 goto finish;
710 }
711
712 /*
713 * Read the common registers. Note that we should try to
714 * validate whether UHS would work or not.
715 */
716 err = sdio_read_cccr(card, ocr);
717 if (err) {
718 mmc_sdio_resend_if_cond(host, card);
719 if (ocr & R4_18V_PRESENT) {
720 /* Retry init sequence, but without R4_18V_PRESENT. */
721 retries = 0;
722 goto try_again;
723 } else {
724 goto remove;
725 }
726 }
727
728 /*
729 * Read the common CIS tuples.
730 */
731 err = sdio_read_common_cis(card);
732 if (err)
733 goto remove;
734
735 if (oldcard) {
736 int same = (card->cis.vendor == oldcard->cis.vendor &&
737 card->cis.device == oldcard->cis.device);
738 mmc_remove_card(card);
739 if (!same)
740 return -ENOENT;
741
742 card = oldcard;
743 }
744 card->ocr = ocr_card;
745 mmc_fixup_device(card, sdio_fixup_methods);
746
747 if (card->type == MMC_TYPE_SD_COMBO) {
748 err = mmc_sd_setup_card(host, card, oldcard != NULL);
749 /* handle as SDIO-only card if memory init failed */
750 if (err) {
751 mmc_go_idle(host);
752 if (mmc_host_is_spi(host))
753 /* should not fail, as it worked previously */
754 mmc_spi_set_crc(host, use_spi_crc);
755 card->type = MMC_TYPE_SDIO;
756 } else
757 card->dev.type = &sd_type;
758 }
759
760 /*
761 * If needed, disconnect card detection pull-up resistor.
762 */
763 err = sdio_disable_cd(card);
764 if (err)
765 goto remove;
766
767 /* Initialization sequence for UHS-I cards */
768 /* Only if card supports 1.8v and UHS signaling */
769 if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
770 err = mmc_sdio_init_uhs_card(card);
771 if (err)
772 goto remove;
773 } else {
774 /*
775 * Switch to high-speed (if supported).
776 */
777 err = sdio_enable_hs(card);
778 if (err > 0)
779 mmc_set_timing(card->host, MMC_TIMING_SD_HS);
780 else if (err)
781 goto remove;
782
783 /*
784 * Change to the card's maximum speed.
785 */
786 mmc_set_clock(host, mmc_sdio_get_max_clock(card));
787
788 /*
789 * Switch to wider bus (if supported).
790 */
791 err = sdio_enable_4bit_bus(card);
792 if (err)
793 goto remove;
794 }
795
796 if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
797 host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
798 pr_err("%s: Host failed to negotiate down from 3.3V\n",
799 mmc_hostname(host));
800 err = -EINVAL;
801 goto remove;
802 }
803 finish:
804 if (!oldcard)
805 host->card = card;
806 return 0;
807
808 remove:
809 if (!oldcard)
810 mmc_remove_card(card);
811
812 err:
813 return err;
814 }
815
mmc_sdio_reinit_card(struct mmc_host * host,bool powered_resume)816 static int mmc_sdio_reinit_card(struct mmc_host *host, bool powered_resume)
817 {
818 int ret;
819
820 sdio_reset(host);
821 mmc_go_idle(host);
822 mmc_send_if_cond(host, host->card->ocr);
823
824 ret = mmc_send_io_op_cond(host, 0, NULL);
825 if (ret)
826 return ret;
827
828 return mmc_sdio_init_card(host, host->card->ocr, host->card,
829 powered_resume);
830 }
831
832 /*
833 * Host is being removed. Free up the current card.
834 */
mmc_sdio_remove(struct mmc_host * host)835 static void mmc_sdio_remove(struct mmc_host *host)
836 {
837 int i;
838
839 for (i = 0;i < host->card->sdio_funcs;i++) {
840 if (host->card->sdio_func[i]) {
841 sdio_remove_func(host->card->sdio_func[i]);
842 host->card->sdio_func[i] = NULL;
843 }
844 }
845
846 mmc_remove_card(host->card);
847 host->card = NULL;
848 }
849
850 /*
851 * Card detection - card is alive.
852 */
mmc_sdio_alive(struct mmc_host * host)853 static int mmc_sdio_alive(struct mmc_host *host)
854 {
855 return mmc_select_card(host->card);
856 }
857
858 /*
859 * Card detection callback from host.
860 */
mmc_sdio_detect(struct mmc_host * host)861 static void mmc_sdio_detect(struct mmc_host *host)
862 {
863 int err;
864
865 /* Make sure card is powered before detecting it */
866 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
867 err = pm_runtime_get_sync(&host->card->dev);
868 if (err < 0) {
869 pm_runtime_put_noidle(&host->card->dev);
870 goto out;
871 }
872 }
873
874 mmc_claim_host(host);
875
876 /*
877 * Just check if our card has been removed.
878 */
879 err = _mmc_detect_card_removed(host);
880
881 mmc_release_host(host);
882
883 /*
884 * Tell PM core it's OK to power off the card now.
885 *
886 * The _sync variant is used in order to ensure that the card
887 * is left powered off in case an error occurred, and the card
888 * is going to be removed.
889 *
890 * Since there is no specific reason to believe a new user
891 * is about to show up at this point, the _sync variant is
892 * desirable anyway.
893 */
894 if (host->caps & MMC_CAP_POWER_OFF_CARD)
895 pm_runtime_put_sync(&host->card->dev);
896
897 out:
898 if (err) {
899 mmc_sdio_remove(host);
900
901 mmc_claim_host(host);
902 mmc_detach_bus(host);
903 mmc_power_off(host);
904 mmc_release_host(host);
905 }
906 }
907
908 /*
909 * SDIO pre_suspend. We need to suspend all functions separately.
910 * Therefore all registered functions must have drivers with suspend
911 * and resume methods. Failing that we simply remove the whole card.
912 */
mmc_sdio_pre_suspend(struct mmc_host * host)913 static int mmc_sdio_pre_suspend(struct mmc_host *host)
914 {
915 int i, err = 0;
916
917 for (i = 0; i < host->card->sdio_funcs; i++) {
918 struct sdio_func *func = host->card->sdio_func[i];
919 if (func && sdio_func_present(func) && func->dev.driver) {
920 const struct dev_pm_ops *pmops = func->dev.driver->pm;
921 if (!pmops || !pmops->suspend || !pmops->resume) {
922 /* force removal of entire card in that case */
923 err = -ENOSYS;
924 break;
925 }
926 }
927 }
928
929 return err;
930 }
931
932 /*
933 * SDIO suspend. Suspend all functions separately.
934 */
mmc_sdio_suspend(struct mmc_host * host)935 static int mmc_sdio_suspend(struct mmc_host *host)
936 {
937 mmc_claim_host(host);
938
939 if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host))
940 sdio_disable_wide(host->card);
941
942 if (!mmc_card_keep_power(host)) {
943 mmc_power_off(host);
944 } else if (host->retune_period) {
945 mmc_retune_timer_stop(host);
946 mmc_retune_needed(host);
947 }
948
949 mmc_release_host(host);
950
951 return 0;
952 }
953
mmc_sdio_resume(struct mmc_host * host)954 static int mmc_sdio_resume(struct mmc_host *host)
955 {
956 int err = 0;
957
958 /* Basic card reinitialization. */
959 mmc_claim_host(host);
960
961 /* Restore power if needed */
962 if (!mmc_card_keep_power(host)) {
963 mmc_power_up(host, host->card->ocr);
964 /*
965 * Tell runtime PM core we just powered up the card,
966 * since it still believes the card is powered off.
967 * Note that currently runtime PM is only enabled
968 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
969 */
970 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
971 pm_runtime_disable(&host->card->dev);
972 pm_runtime_set_active(&host->card->dev);
973 pm_runtime_enable(&host->card->dev);
974 }
975 }
976
977 /* No need to reinitialize powered-resumed nonremovable cards */
978 if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
979 err = mmc_sdio_reinit_card(host, mmc_card_keep_power(host));
980 } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
981 /* We may have switched to 1-bit mode during suspend */
982 err = sdio_enable_4bit_bus(host->card);
983 }
984
985 if (!err && host->sdio_irqs) {
986 if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD))
987 wake_up_process(host->sdio_irq_thread);
988 else if (host->caps & MMC_CAP_SDIO_IRQ)
989 host->ops->enable_sdio_irq(host, 1);
990 }
991
992 mmc_release_host(host);
993
994 host->pm_flags &= ~MMC_PM_KEEP_POWER;
995 return err;
996 }
997
mmc_sdio_power_restore(struct mmc_host * host)998 static int mmc_sdio_power_restore(struct mmc_host *host)
999 {
1000 int ret;
1001
1002 /*
1003 * Reset the card by performing the same steps that are taken by
1004 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1005 *
1006 * sdio_reset() is technically not needed. Having just powered up the
1007 * hardware, it should already be in reset state. However, some
1008 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1009 * meaning that a reset is required when restoring power soon after
1010 * powering off. It is harmless in other cases.
1011 *
1012 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1013 * is not necessary for non-removable cards. However, it is required
1014 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1015 * harmless in other situations.
1016 *
1017 */
1018
1019 mmc_claim_host(host);
1020
1021 ret = mmc_sdio_reinit_card(host, mmc_card_keep_power(host));
1022 if (!ret && host->sdio_irqs)
1023 mmc_signal_sdio_irq(host);
1024
1025 mmc_release_host(host);
1026
1027 return ret;
1028 }
1029
mmc_sdio_runtime_suspend(struct mmc_host * host)1030 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1031 {
1032 /* No references to the card, cut the power to it. */
1033 mmc_claim_host(host);
1034 mmc_power_off(host);
1035 mmc_release_host(host);
1036
1037 return 0;
1038 }
1039
mmc_sdio_runtime_resume(struct mmc_host * host)1040 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1041 {
1042 int ret;
1043
1044 /* Restore power and re-initialize. */
1045 mmc_claim_host(host);
1046 mmc_power_up(host, host->card->ocr);
1047 ret = mmc_sdio_power_restore(host);
1048 mmc_release_host(host);
1049
1050 return ret;
1051 }
1052
mmc_sdio_hw_reset(struct mmc_host * host)1053 static int mmc_sdio_hw_reset(struct mmc_host *host)
1054 {
1055 mmc_power_cycle(host, host->card->ocr);
1056 return mmc_sdio_power_restore(host);
1057 }
1058
mmc_sdio_sw_reset(struct mmc_host * host)1059 static int mmc_sdio_sw_reset(struct mmc_host *host)
1060 {
1061 mmc_set_clock(host, host->f_init);
1062 sdio_reset(host);
1063 mmc_go_idle(host);
1064
1065 mmc_set_initial_state(host);
1066 mmc_set_initial_signal_voltage(host);
1067
1068 return mmc_sdio_reinit_card(host, 0);
1069 }
1070
1071 static const struct mmc_bus_ops mmc_sdio_ops = {
1072 .remove = mmc_sdio_remove,
1073 .detect = mmc_sdio_detect,
1074 .pre_suspend = mmc_sdio_pre_suspend,
1075 .suspend = mmc_sdio_suspend,
1076 .resume = mmc_sdio_resume,
1077 .runtime_suspend = mmc_sdio_runtime_suspend,
1078 .runtime_resume = mmc_sdio_runtime_resume,
1079 .alive = mmc_sdio_alive,
1080 .hw_reset = mmc_sdio_hw_reset,
1081 .sw_reset = mmc_sdio_sw_reset,
1082 };
1083
1084
1085 /*
1086 * Starting point for SDIO card init.
1087 */
mmc_attach_sdio(struct mmc_host * host)1088 int mmc_attach_sdio(struct mmc_host *host)
1089 {
1090 int err, i, funcs;
1091 u32 ocr, rocr;
1092 struct mmc_card *card;
1093
1094 WARN_ON(!host->claimed);
1095
1096 err = mmc_send_io_op_cond(host, 0, &ocr);
1097 if (err)
1098 return err;
1099
1100 mmc_attach_bus(host, &mmc_sdio_ops);
1101 if (host->ocr_avail_sdio)
1102 host->ocr_avail = host->ocr_avail_sdio;
1103
1104
1105 rocr = mmc_select_voltage(host, ocr);
1106
1107 /*
1108 * Can we support the voltage(s) of the card(s)?
1109 */
1110 if (!rocr) {
1111 err = -EINVAL;
1112 goto err;
1113 }
1114
1115 /*
1116 * Detect and init the card.
1117 */
1118 err = mmc_sdio_init_card(host, rocr, NULL, 0);
1119 if (err)
1120 goto err;
1121
1122 card = host->card;
1123
1124 /*
1125 * Enable runtime PM only if supported by host+card+board
1126 */
1127 if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1128 /*
1129 * Do not allow runtime suspend until after SDIO function
1130 * devices are added.
1131 */
1132 pm_runtime_get_noresume(&card->dev);
1133
1134 /*
1135 * Let runtime PM core know our card is active
1136 */
1137 err = pm_runtime_set_active(&card->dev);
1138 if (err)
1139 goto remove;
1140
1141 /*
1142 * Enable runtime PM for this card
1143 */
1144 pm_runtime_enable(&card->dev);
1145 }
1146
1147 /*
1148 * The number of functions on the card is encoded inside
1149 * the ocr.
1150 */
1151 funcs = (ocr & 0x70000000) >> 28;
1152 card->sdio_funcs = 0;
1153
1154 /*
1155 * Initialize (but don't add) all present functions.
1156 */
1157 for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1158 err = sdio_init_func(host->card, i + 1);
1159 if (err)
1160 goto remove;
1161
1162 /*
1163 * Enable Runtime PM for this func (if supported)
1164 */
1165 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1166 pm_runtime_enable(&card->sdio_func[i]->dev);
1167 }
1168
1169 /*
1170 * First add the card to the driver model...
1171 */
1172 mmc_release_host(host);
1173 err = mmc_add_card(host->card);
1174 if (err)
1175 goto remove_added;
1176
1177 /*
1178 * ...then the SDIO functions.
1179 */
1180 for (i = 0;i < funcs;i++) {
1181 err = sdio_add_func(host->card->sdio_func[i]);
1182 if (err)
1183 goto remove_added;
1184 }
1185
1186 if (host->caps & MMC_CAP_POWER_OFF_CARD)
1187 pm_runtime_put(&card->dev);
1188
1189 mmc_claim_host(host);
1190 return 0;
1191
1192
1193 remove:
1194 mmc_release_host(host);
1195 remove_added:
1196 /*
1197 * The devices are being deleted so it is not necessary to disable
1198 * runtime PM. Similarly we also don't pm_runtime_put() the SDIO card
1199 * because it needs to be active to remove any function devices that
1200 * were probed, and after that it gets deleted.
1201 */
1202 mmc_sdio_remove(host);
1203 mmc_claim_host(host);
1204 err:
1205 mmc_detach_bus(host);
1206
1207 pr_err("%s: error %d whilst initialising SDIO card\n",
1208 mmc_hostname(host), err);
1209
1210 return err;
1211 }
1212
1213
