xref: /openbmc/linux/drivers/mmc/core/sdio.c (revision 92a2c6b2)
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 "bus.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 
31 static int sdio_read_fbr(struct sdio_func *func)
32 {
33 	int ret;
34 	unsigned char data;
35 
36 	if (mmc_card_nonstd_func_interface(func->card)) {
37 		func->class = SDIO_CLASS_NONE;
38 		return 0;
39 	}
40 
41 	ret = mmc_io_rw_direct(func->card, 0, 0,
42 		SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
43 	if (ret)
44 		goto out;
45 
46 	data &= 0x0f;
47 
48 	if (data == 0x0f) {
49 		ret = mmc_io_rw_direct(func->card, 0, 0,
50 			SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
51 		if (ret)
52 			goto out;
53 	}
54 
55 	func->class = data;
56 
57 out:
58 	return ret;
59 }
60 
61 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
62 {
63 	int ret;
64 	struct sdio_func *func;
65 
66 	BUG_ON(fn > SDIO_MAX_FUNCS);
67 
68 	func = sdio_alloc_func(card);
69 	if (IS_ERR(func))
70 		return PTR_ERR(func);
71 
72 	func->num = fn;
73 
74 	if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
75 		ret = sdio_read_fbr(func);
76 		if (ret)
77 			goto fail;
78 
79 		ret = sdio_read_func_cis(func);
80 		if (ret)
81 			goto fail;
82 	} else {
83 		func->vendor = func->card->cis.vendor;
84 		func->device = func->card->cis.device;
85 		func->max_blksize = func->card->cis.blksize;
86 	}
87 
88 	card->sdio_func[fn - 1] = func;
89 
90 	return 0;
91 
92 fail:
93 	/*
94 	 * It is okay to remove the function here even though we hold
95 	 * the host lock as we haven't registered the device yet.
96 	 */
97 	sdio_remove_func(func);
98 	return ret;
99 }
100 
101 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
102 {
103 	int ret;
104 	int cccr_vsn;
105 	int uhs = ocr & R4_18V_PRESENT;
106 	unsigned char data;
107 	unsigned char speed;
108 
109 	memset(&card->cccr, 0, sizeof(struct sdio_cccr));
110 
111 	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
112 	if (ret)
113 		goto out;
114 
115 	cccr_vsn = data & 0x0f;
116 
117 	if (cccr_vsn > SDIO_CCCR_REV_3_00) {
118 		pr_err("%s: unrecognised CCCR structure version %d\n",
119 			mmc_hostname(card->host), cccr_vsn);
120 		return -EINVAL;
121 	}
122 
123 	card->cccr.sdio_vsn = (data & 0xf0) >> 4;
124 
125 	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
126 	if (ret)
127 		goto out;
128 
129 	if (data & SDIO_CCCR_CAP_SMB)
130 		card->cccr.multi_block = 1;
131 	if (data & SDIO_CCCR_CAP_LSC)
132 		card->cccr.low_speed = 1;
133 	if (data & SDIO_CCCR_CAP_4BLS)
134 		card->cccr.wide_bus = 1;
135 
136 	if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
137 		ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
138 		if (ret)
139 			goto out;
140 
141 		if (data & SDIO_POWER_SMPC)
142 			card->cccr.high_power = 1;
143 	}
144 
145 	if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
146 		ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
147 		if (ret)
148 			goto out;
149 
150 		card->scr.sda_spec3 = 0;
151 		card->sw_caps.sd3_bus_mode = 0;
152 		card->sw_caps.sd3_drv_type = 0;
153 		if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
154 			card->scr.sda_spec3 = 1;
155 			ret = mmc_io_rw_direct(card, 0, 0,
156 				SDIO_CCCR_UHS, 0, &data);
157 			if (ret)
158 				goto out;
159 
160 			if (mmc_host_uhs(card->host)) {
161 				if (data & SDIO_UHS_DDR50)
162 					card->sw_caps.sd3_bus_mode
163 						|= SD_MODE_UHS_DDR50;
164 
165 				if (data & SDIO_UHS_SDR50)
166 					card->sw_caps.sd3_bus_mode
167 						|= SD_MODE_UHS_SDR50;
168 
169 				if (data & SDIO_UHS_SDR104)
170 					card->sw_caps.sd3_bus_mode
171 						|= SD_MODE_UHS_SDR104;
172 			}
173 
174 			ret = mmc_io_rw_direct(card, 0, 0,
175 				SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
176 			if (ret)
177 				goto out;
178 
179 			if (data & SDIO_DRIVE_SDTA)
180 				card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
181 			if (data & SDIO_DRIVE_SDTC)
182 				card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
183 			if (data & SDIO_DRIVE_SDTD)
184 				card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
185 		}
186 
187 		/* if no uhs mode ensure we check for high speed */
188 		if (!card->sw_caps.sd3_bus_mode) {
189 			if (speed & SDIO_SPEED_SHS) {
190 				card->cccr.high_speed = 1;
191 				card->sw_caps.hs_max_dtr = 50000000;
192 			} else {
193 				card->cccr.high_speed = 0;
194 				card->sw_caps.hs_max_dtr = 25000000;
195 			}
196 		}
197 	}
198 
199 out:
200 	return ret;
201 }
202 
203 static int sdio_enable_wide(struct mmc_card *card)
204 {
205 	int ret;
206 	u8 ctrl;
207 
208 	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
209 		return 0;
210 
211 	if (card->cccr.low_speed && !card->cccr.wide_bus)
212 		return 0;
213 
214 	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
215 	if (ret)
216 		return ret;
217 
218 	if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
219 		pr_warn("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
220 			mmc_hostname(card->host), ctrl);
221 
222 	/* set as 4-bit bus width */
223 	ctrl &= ~SDIO_BUS_WIDTH_MASK;
224 	ctrl |= SDIO_BUS_WIDTH_4BIT;
225 
226 	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
227 	if (ret)
228 		return ret;
229 
230 	return 1;
231 }
232 
233 /*
234  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
235  * of the card. This may be required on certain setups of boards,
236  * controllers and embedded sdio device which do not need the card's
237  * pull-up. As a result, card detection is disabled and power is saved.
238  */
239 static int sdio_disable_cd(struct mmc_card *card)
240 {
241 	int ret;
242 	u8 ctrl;
243 
244 	if (!mmc_card_disable_cd(card))
245 		return 0;
246 
247 	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
248 	if (ret)
249 		return ret;
250 
251 	ctrl |= SDIO_BUS_CD_DISABLE;
252 
253 	return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
254 }
255 
256 /*
257  * Devices that remain active during a system suspend are
258  * put back into 1-bit mode.
259  */
260 static int sdio_disable_wide(struct mmc_card *card)
261 {
262 	int ret;
263 	u8 ctrl;
264 
265 	if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
266 		return 0;
267 
268 	if (card->cccr.low_speed && !card->cccr.wide_bus)
269 		return 0;
270 
271 	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
272 	if (ret)
273 		return ret;
274 
275 	if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
276 		return 0;
277 
278 	ctrl &= ~SDIO_BUS_WIDTH_4BIT;
279 	ctrl |= SDIO_BUS_ASYNC_INT;
280 
281 	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
282 	if (ret)
283 		return ret;
284 
285 	mmc_set_bus_width(card->host, MMC_BUS_WIDTH_1);
286 
287 	return 0;
288 }
289 
290 
291 static int sdio_enable_4bit_bus(struct mmc_card *card)
292 {
293 	int err;
294 
295 	if (card->type == MMC_TYPE_SDIO)
296 		return sdio_enable_wide(card);
297 
298 	if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
299 		(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
300 		err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
301 		if (err)
302 			return err;
303 	} else
304 		return 0;
305 
306 	err = sdio_enable_wide(card);
307 	if (err <= 0)
308 		mmc_app_set_bus_width(card, MMC_BUS_WIDTH_1);
309 
310 	return err;
311 }
312 
313 
314 /*
315  * Test if the card supports high-speed mode and, if so, switch to it.
316  */
317 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
318 {
319 	int ret;
320 	u8 speed;
321 
322 	if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
323 		return 0;
324 
325 	if (!card->cccr.high_speed)
326 		return 0;
327 
328 	ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
329 	if (ret)
330 		return ret;
331 
332 	if (enable)
333 		speed |= SDIO_SPEED_EHS;
334 	else
335 		speed &= ~SDIO_SPEED_EHS;
336 
337 	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
338 	if (ret)
339 		return ret;
340 
341 	return 1;
342 }
343 
344 /*
345  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
346  */
347 static int sdio_enable_hs(struct mmc_card *card)
348 {
349 	int ret;
350 
351 	ret = mmc_sdio_switch_hs(card, true);
352 	if (ret <= 0 || card->type == MMC_TYPE_SDIO)
353 		return ret;
354 
355 	ret = mmc_sd_switch_hs(card);
356 	if (ret <= 0)
357 		mmc_sdio_switch_hs(card, false);
358 
359 	return ret;
360 }
361 
362 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
363 {
364 	unsigned max_dtr;
365 
366 	if (mmc_card_hs(card)) {
367 		/*
368 		 * The SDIO specification doesn't mention how
369 		 * the CIS transfer speed register relates to
370 		 * high-speed, but it seems that 50 MHz is
371 		 * mandatory.
372 		 */
373 		max_dtr = 50000000;
374 	} else {
375 		max_dtr = card->cis.max_dtr;
376 	}
377 
378 	if (card->type == MMC_TYPE_SD_COMBO)
379 		max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
380 
381 	return max_dtr;
382 }
383 
384 static unsigned char host_drive_to_sdio_drive(int host_strength)
385 {
386 	switch (host_strength) {
387 	case MMC_SET_DRIVER_TYPE_A:
388 		return SDIO_DTSx_SET_TYPE_A;
389 	case MMC_SET_DRIVER_TYPE_B:
390 		return SDIO_DTSx_SET_TYPE_B;
391 	case MMC_SET_DRIVER_TYPE_C:
392 		return SDIO_DTSx_SET_TYPE_C;
393 	case MMC_SET_DRIVER_TYPE_D:
394 		return SDIO_DTSx_SET_TYPE_D;
395 	default:
396 		return SDIO_DTSx_SET_TYPE_B;
397 	}
398 }
399 
400 static void sdio_select_driver_type(struct mmc_card *card)
401 {
402 	int host_drv_type = SD_DRIVER_TYPE_B;
403 	int card_drv_type = SD_DRIVER_TYPE_B;
404 	int drive_strength;
405 	unsigned char card_strength;
406 	int err;
407 
408 	/*
409 	 * If the host doesn't support any of the Driver Types A,C or D,
410 	 * or there is no board specific handler then default Driver
411 	 * Type B is used.
412 	 */
413 	if (!(card->host->caps &
414 		(MMC_CAP_DRIVER_TYPE_A |
415 		 MMC_CAP_DRIVER_TYPE_C |
416 		 MMC_CAP_DRIVER_TYPE_D)))
417 		return;
418 
419 	if (!card->host->ops->select_drive_strength)
420 		return;
421 
422 	if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
423 		host_drv_type |= SD_DRIVER_TYPE_A;
424 
425 	if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
426 		host_drv_type |= SD_DRIVER_TYPE_C;
427 
428 	if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
429 		host_drv_type |= SD_DRIVER_TYPE_D;
430 
431 	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
432 		card_drv_type |= SD_DRIVER_TYPE_A;
433 
434 	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
435 		card_drv_type |= SD_DRIVER_TYPE_C;
436 
437 	if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
438 		card_drv_type |= SD_DRIVER_TYPE_D;
439 
440 	/*
441 	 * The drive strength that the hardware can support
442 	 * depends on the board design.  Pass the appropriate
443 	 * information and let the hardware specific code
444 	 * return what is possible given the options
445 	 */
446 	drive_strength = card->host->ops->select_drive_strength(
447 		card->sw_caps.uhs_max_dtr,
448 		host_drv_type, card_drv_type);
449 
450 	/* if error just use default for drive strength B */
451 	err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
452 		&card_strength);
453 	if (err)
454 		return;
455 
456 	card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
457 	card_strength |= host_drive_to_sdio_drive(drive_strength);
458 
459 	err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
460 		card_strength, NULL);
461 
462 	/* if error default to drive strength B */
463 	if (!err)
464 		mmc_set_driver_type(card->host, drive_strength);
465 }
466 
467 
468 static int sdio_set_bus_speed_mode(struct mmc_card *card)
469 {
470 	unsigned int bus_speed, timing;
471 	int err;
472 	unsigned char speed;
473 
474 	/*
475 	 * If the host doesn't support any of the UHS-I modes, fallback on
476 	 * default speed.
477 	 */
478 	if (!mmc_host_uhs(card->host))
479 		return 0;
480 
481 	bus_speed = SDIO_SPEED_SDR12;
482 	timing = MMC_TIMING_UHS_SDR12;
483 	if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
484 	    (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
485 			bus_speed = SDIO_SPEED_SDR104;
486 			timing = MMC_TIMING_UHS_SDR104;
487 			card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
488 			card->sd_bus_speed = UHS_SDR104_BUS_SPEED;
489 	} else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
490 		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
491 			bus_speed = SDIO_SPEED_DDR50;
492 			timing = MMC_TIMING_UHS_DDR50;
493 			card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
494 			card->sd_bus_speed = UHS_DDR50_BUS_SPEED;
495 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
496 		    MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
497 		    SD_MODE_UHS_SDR50)) {
498 			bus_speed = SDIO_SPEED_SDR50;
499 			timing = MMC_TIMING_UHS_SDR50;
500 			card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
501 			card->sd_bus_speed = UHS_SDR50_BUS_SPEED;
502 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
503 		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25)) &&
504 		   (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
505 			bus_speed = SDIO_SPEED_SDR25;
506 			timing = MMC_TIMING_UHS_SDR25;
507 			card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
508 			card->sd_bus_speed = UHS_SDR25_BUS_SPEED;
509 	} else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
510 		    MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR25 |
511 		    MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
512 		    SD_MODE_UHS_SDR12)) {
513 			bus_speed = SDIO_SPEED_SDR12;
514 			timing = MMC_TIMING_UHS_SDR12;
515 			card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516 			card->sd_bus_speed = UHS_SDR12_BUS_SPEED;
517 	}
518 
519 	err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
520 	if (err)
521 		return err;
522 
523 	speed &= ~SDIO_SPEED_BSS_MASK;
524 	speed |= bus_speed;
525 	err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
526 	if (err)
527 		return err;
528 
529 	if (bus_speed) {
530 		mmc_set_timing(card->host, timing);
531 		mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
532 	}
533 
534 	return 0;
535 }
536 
537 /*
538  * UHS-I specific initialization procedure
539  */
540 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
541 {
542 	int err;
543 
544 	if (!card->scr.sda_spec3)
545 		return 0;
546 
547 	/*
548 	 * Switch to wider bus (if supported).
549 	 */
550 	if (card->host->caps & MMC_CAP_4_BIT_DATA) {
551 		err = sdio_enable_4bit_bus(card);
552 		if (err > 0) {
553 			mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
554 			err = 0;
555 		}
556 	}
557 
558 	/* Set the driver strength for the card */
559 	sdio_select_driver_type(card);
560 
561 	/* Set bus speed mode of the card */
562 	err = sdio_set_bus_speed_mode(card);
563 	if (err)
564 		goto out;
565 
566 	/*
567 	 * SPI mode doesn't define CMD19 and tuning is only valid for SDR50 and
568 	 * SDR104 mode SD-cards. Note that tuning is mandatory for SDR104.
569 	 */
570 	if (!mmc_host_is_spi(card->host) &&
571 	    ((card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR50) ||
572 	     (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)))
573 		err = mmc_execute_tuning(card);
574 out:
575 	return err;
576 }
577 
578 /*
579  * Handle the detection and initialisation of a card.
580  *
581  * In the case of a resume, "oldcard" will contain the card
582  * we're trying to reinitialise.
583  */
584 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
585 			      struct mmc_card *oldcard, int powered_resume)
586 {
587 	struct mmc_card *card;
588 	int err;
589 	int retries = 10;
590 	u32 rocr = 0;
591 	u32 ocr_card = ocr;
592 
593 	BUG_ON(!host);
594 	WARN_ON(!host->claimed);
595 
596 	/* to query card if 1.8V signalling is supported */
597 	if (mmc_host_uhs(host))
598 		ocr |= R4_18V_PRESENT;
599 
600 try_again:
601 	if (!retries) {
602 		pr_warn("%s: Skipping voltage switch\n", mmc_hostname(host));
603 		ocr &= ~R4_18V_PRESENT;
604 	}
605 
606 	/*
607 	 * Inform the card of the voltage
608 	 */
609 	if (!powered_resume) {
610 		err = mmc_send_io_op_cond(host, ocr, &rocr);
611 		if (err)
612 			goto err;
613 	}
614 
615 	/*
616 	 * For SPI, enable CRC as appropriate.
617 	 */
618 	if (mmc_host_is_spi(host)) {
619 		err = mmc_spi_set_crc(host, use_spi_crc);
620 		if (err)
621 			goto err;
622 	}
623 
624 	/*
625 	 * Allocate card structure.
626 	 */
627 	card = mmc_alloc_card(host, NULL);
628 	if (IS_ERR(card)) {
629 		err = PTR_ERR(card);
630 		goto err;
631 	}
632 
633 	if ((rocr & R4_MEMORY_PRESENT) &&
634 	    mmc_sd_get_cid(host, ocr & rocr, card->raw_cid, NULL) == 0) {
635 		card->type = MMC_TYPE_SD_COMBO;
636 
637 		if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
638 		    memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
639 			mmc_remove_card(card);
640 			return -ENOENT;
641 		}
642 	} else {
643 		card->type = MMC_TYPE_SDIO;
644 
645 		if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
646 			mmc_remove_card(card);
647 			return -ENOENT;
648 		}
649 	}
650 
651 	/*
652 	 * Call the optional HC's init_card function to handle quirks.
653 	 */
654 	if (host->ops->init_card)
655 		host->ops->init_card(host, card);
656 
657 	/*
658 	 * If the host and card support UHS-I mode request the card
659 	 * to switch to 1.8V signaling level.  No 1.8v signalling if
660 	 * UHS mode is not enabled to maintain compatibility and some
661 	 * systems that claim 1.8v signalling in fact do not support
662 	 * it.
663 	 */
664 	if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
665 		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
666 					ocr);
667 		if (err == -EAGAIN) {
668 			sdio_reset(host);
669 			mmc_go_idle(host);
670 			mmc_send_if_cond(host, host->ocr_avail);
671 			mmc_remove_card(card);
672 			retries--;
673 			goto try_again;
674 		} else if (err) {
675 			ocr &= ~R4_18V_PRESENT;
676 		}
677 		err = 0;
678 	} else {
679 		ocr &= ~R4_18V_PRESENT;
680 	}
681 
682 	/*
683 	 * For native busses:  set card RCA and quit open drain mode.
684 	 */
685 	if (!powered_resume && !mmc_host_is_spi(host)) {
686 		err = mmc_send_relative_addr(host, &card->rca);
687 		if (err)
688 			goto remove;
689 
690 		/*
691 		 * Update oldcard with the new RCA received from the SDIO
692 		 * device -- we're doing this so that it's updated in the
693 		 * "card" struct when oldcard overwrites that later.
694 		 */
695 		if (oldcard)
696 			oldcard->rca = card->rca;
697 	}
698 
699 	/*
700 	 * Read CSD, before selecting the card
701 	 */
702 	if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
703 		err = mmc_sd_get_csd(host, card);
704 		if (err)
705 			return err;
706 
707 		mmc_decode_cid(card);
708 	}
709 
710 	/*
711 	 * Select card, as all following commands rely on that.
712 	 */
713 	if (!powered_resume && !mmc_host_is_spi(host)) {
714 		err = mmc_select_card(card);
715 		if (err)
716 			goto remove;
717 	}
718 
719 	if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
720 		/*
721 		 * This is non-standard SDIO device, meaning it doesn't
722 		 * have any CIA (Common I/O area) registers present.
723 		 * It's host's responsibility to fill cccr and cis
724 		 * structures in init_card().
725 		 */
726 		mmc_set_clock(host, card->cis.max_dtr);
727 
728 		if (card->cccr.high_speed) {
729 			mmc_set_timing(card->host, MMC_TIMING_SD_HS);
730 		}
731 
732 		goto finish;
733 	}
734 
735 	/*
736 	 * Read the common registers.
737 	 */
738 	err = sdio_read_cccr(card, ocr);
739 	if (err)
740 		goto remove;
741 
742 	/*
743 	 * Read the common CIS tuples.
744 	 */
745 	err = sdio_read_common_cis(card);
746 	if (err)
747 		goto remove;
748 
749 	if (oldcard) {
750 		int same = (card->cis.vendor == oldcard->cis.vendor &&
751 			    card->cis.device == oldcard->cis.device);
752 		mmc_remove_card(card);
753 		if (!same)
754 			return -ENOENT;
755 
756 		card = oldcard;
757 	}
758 	card->ocr = ocr_card;
759 	mmc_fixup_device(card, NULL);
760 
761 	if (card->type == MMC_TYPE_SD_COMBO) {
762 		err = mmc_sd_setup_card(host, card, oldcard != NULL);
763 		/* handle as SDIO-only card if memory init failed */
764 		if (err) {
765 			mmc_go_idle(host);
766 			if (mmc_host_is_spi(host))
767 				/* should not fail, as it worked previously */
768 				mmc_spi_set_crc(host, use_spi_crc);
769 			card->type = MMC_TYPE_SDIO;
770 		} else
771 			card->dev.type = &sd_type;
772 	}
773 
774 	/*
775 	 * If needed, disconnect card detection pull-up resistor.
776 	 */
777 	err = sdio_disable_cd(card);
778 	if (err)
779 		goto remove;
780 
781 	/* Initialization sequence for UHS-I cards */
782 	/* Only if card supports 1.8v and UHS signaling */
783 	if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
784 		err = mmc_sdio_init_uhs_card(card);
785 		if (err)
786 			goto remove;
787 	} else {
788 		/*
789 		 * Switch to high-speed (if supported).
790 		 */
791 		err = sdio_enable_hs(card);
792 		if (err > 0)
793 			mmc_set_timing(card->host, MMC_TIMING_SD_HS);
794 		else if (err)
795 			goto remove;
796 
797 		/*
798 		 * Change to the card's maximum speed.
799 		 */
800 		mmc_set_clock(host, mmc_sdio_get_max_clock(card));
801 
802 		/*
803 		 * Switch to wider bus (if supported).
804 		 */
805 		err = sdio_enable_4bit_bus(card);
806 		if (err > 0)
807 			mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
808 		else if (err)
809 			goto remove;
810 	}
811 finish:
812 	if (!oldcard)
813 		host->card = card;
814 	return 0;
815 
816 remove:
817 	if (!oldcard)
818 		mmc_remove_card(card);
819 
820 err:
821 	return err;
822 }
823 
824 /*
825  * Host is being removed. Free up the current card.
826  */
827 static void mmc_sdio_remove(struct mmc_host *host)
828 {
829 	int i;
830 
831 	BUG_ON(!host);
832 	BUG_ON(!host->card);
833 
834 	for (i = 0;i < host->card->sdio_funcs;i++) {
835 		if (host->card->sdio_func[i]) {
836 			sdio_remove_func(host->card->sdio_func[i]);
837 			host->card->sdio_func[i] = NULL;
838 		}
839 	}
840 
841 	mmc_remove_card(host->card);
842 	host->card = NULL;
843 }
844 
845 /*
846  * Card detection - card is alive.
847  */
848 static int mmc_sdio_alive(struct mmc_host *host)
849 {
850 	return mmc_select_card(host->card);
851 }
852 
853 /*
854  * Card detection callback from host.
855  */
856 static void mmc_sdio_detect(struct mmc_host *host)
857 {
858 	int err;
859 
860 	BUG_ON(!host);
861 	BUG_ON(!host->card);
862 
863 	/* Make sure card is powered before detecting it */
864 	if (host->caps & MMC_CAP_POWER_OFF_CARD) {
865 		err = pm_runtime_get_sync(&host->card->dev);
866 		if (err < 0) {
867 			pm_runtime_put_noidle(&host->card->dev);
868 			goto out;
869 		}
870 	}
871 
872 	mmc_claim_host(host);
873 
874 	/*
875 	 * Just check if our card has been removed.
876 	 */
877 	err = _mmc_detect_card_removed(host);
878 
879 	mmc_release_host(host);
880 
881 	/*
882 	 * Tell PM core it's OK to power off the card now.
883 	 *
884 	 * The _sync variant is used in order to ensure that the card
885 	 * is left powered off in case an error occurred, and the card
886 	 * is going to be removed.
887 	 *
888 	 * Since there is no specific reason to believe a new user
889 	 * is about to show up at this point, the _sync variant is
890 	 * desirable anyway.
891 	 */
892 	if (host->caps & MMC_CAP_POWER_OFF_CARD)
893 		pm_runtime_put_sync(&host->card->dev);
894 
895 out:
896 	if (err) {
897 		mmc_sdio_remove(host);
898 
899 		mmc_claim_host(host);
900 		mmc_detach_bus(host);
901 		mmc_power_off(host);
902 		mmc_release_host(host);
903 	}
904 }
905 
906 /*
907  * SDIO pre_suspend.  We need to suspend all functions separately.
908  * Therefore all registered functions must have drivers with suspend
909  * and resume methods.  Failing that we simply remove the whole card.
910  */
911 static int mmc_sdio_pre_suspend(struct mmc_host *host)
912 {
913 	int i, err = 0;
914 
915 	for (i = 0; i < host->card->sdio_funcs; i++) {
916 		struct sdio_func *func = host->card->sdio_func[i];
917 		if (func && sdio_func_present(func) && func->dev.driver) {
918 			const struct dev_pm_ops *pmops = func->dev.driver->pm;
919 			if (!pmops || !pmops->suspend || !pmops->resume) {
920 				/* force removal of entire card in that case */
921 				err = -ENOSYS;
922 				break;
923 			}
924 		}
925 	}
926 
927 	return err;
928 }
929 
930 /*
931  * SDIO suspend.  Suspend all functions separately.
932  */
933 static int mmc_sdio_suspend(struct mmc_host *host)
934 {
935 	if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
936 		mmc_claim_host(host);
937 		sdio_disable_wide(host->card);
938 		mmc_release_host(host);
939 	}
940 
941 	if (!mmc_card_keep_power(host))
942 		mmc_power_off(host);
943 
944 	return 0;
945 }
946 
947 static int mmc_sdio_resume(struct mmc_host *host)
948 {
949 	int err = 0;
950 
951 	BUG_ON(!host);
952 	BUG_ON(!host->card);
953 
954 	/* Basic card reinitialization. */
955 	mmc_claim_host(host);
956 
957 	/* Restore power if needed */
958 	if (!mmc_card_keep_power(host)) {
959 		mmc_power_up(host, host->card->ocr);
960 		/*
961 		 * Tell runtime PM core we just powered up the card,
962 		 * since it still believes the card is powered off.
963 		 * Note that currently runtime PM is only enabled
964 		 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
965 		 */
966 		if (host->caps & MMC_CAP_POWER_OFF_CARD) {
967 			pm_runtime_disable(&host->card->dev);
968 			pm_runtime_set_active(&host->card->dev);
969 			pm_runtime_enable(&host->card->dev);
970 		}
971 	}
972 
973 	/* No need to reinitialize powered-resumed nonremovable cards */
974 	if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
975 		sdio_reset(host);
976 		mmc_go_idle(host);
977 		mmc_send_if_cond(host, host->card->ocr);
978 		err = mmc_send_io_op_cond(host, 0, NULL);
979 		if (!err)
980 			err = mmc_sdio_init_card(host, host->card->ocr,
981 						 host->card,
982 						 mmc_card_keep_power(host));
983 	} else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
984 		/* We may have switched to 1-bit mode during suspend */
985 		err = sdio_enable_4bit_bus(host->card);
986 		if (err > 0) {
987 			mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
988 			err = 0;
989 		}
990 	}
991 
992 	if (!err && host->sdio_irqs) {
993 		if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
994 			wake_up_process(host->sdio_irq_thread);
995 		} else if (host->caps & MMC_CAP_SDIO_IRQ) {
996 			mmc_host_clk_hold(host);
997 			host->ops->enable_sdio_irq(host, 1);
998 			mmc_host_clk_release(host);
999 		}
1000 	}
1001 
1002 	mmc_release_host(host);
1003 
1004 	host->pm_flags &= ~MMC_PM_KEEP_POWER;
1005 	return err;
1006 }
1007 
1008 static int mmc_sdio_power_restore(struct mmc_host *host)
1009 {
1010 	int ret;
1011 
1012 	BUG_ON(!host);
1013 	BUG_ON(!host->card);
1014 
1015 	mmc_claim_host(host);
1016 
1017 	/*
1018 	 * Reset the card by performing the same steps that are taken by
1019 	 * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
1020 	 *
1021 	 * sdio_reset() is technically not needed. Having just powered up the
1022 	 * hardware, it should already be in reset state. However, some
1023 	 * platforms (such as SD8686 on OLPC) do not instantly cut power,
1024 	 * meaning that a reset is required when restoring power soon after
1025 	 * powering off. It is harmless in other cases.
1026 	 *
1027 	 * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
1028 	 * is not necessary for non-removable cards. However, it is required
1029 	 * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1030 	 * harmless in other situations.
1031 	 *
1032 	 */
1033 
1034 	sdio_reset(host);
1035 	mmc_go_idle(host);
1036 	mmc_send_if_cond(host, host->card->ocr);
1037 
1038 	ret = mmc_send_io_op_cond(host, 0, NULL);
1039 	if (ret)
1040 		goto out;
1041 
1042 	ret = mmc_sdio_init_card(host, host->card->ocr, host->card,
1043 				mmc_card_keep_power(host));
1044 	if (!ret && host->sdio_irqs)
1045 		mmc_signal_sdio_irq(host);
1046 
1047 out:
1048 	mmc_release_host(host);
1049 
1050 	return ret;
1051 }
1052 
1053 static int mmc_sdio_runtime_suspend(struct mmc_host *host)
1054 {
1055 	/* No references to the card, cut the power to it. */
1056 	mmc_power_off(host);
1057 	return 0;
1058 }
1059 
1060 static int mmc_sdio_runtime_resume(struct mmc_host *host)
1061 {
1062 	/* Restore power and re-initialize. */
1063 	mmc_power_up(host, host->card->ocr);
1064 	return mmc_sdio_power_restore(host);
1065 }
1066 
1067 static const struct mmc_bus_ops mmc_sdio_ops = {
1068 	.remove = mmc_sdio_remove,
1069 	.detect = mmc_sdio_detect,
1070 	.pre_suspend = mmc_sdio_pre_suspend,
1071 	.suspend = mmc_sdio_suspend,
1072 	.resume = mmc_sdio_resume,
1073 	.runtime_suspend = mmc_sdio_runtime_suspend,
1074 	.runtime_resume = mmc_sdio_runtime_resume,
1075 	.power_restore = mmc_sdio_power_restore,
1076 	.alive = mmc_sdio_alive,
1077 };
1078 
1079 
1080 /*
1081  * Starting point for SDIO card init.
1082  */
1083 int mmc_attach_sdio(struct mmc_host *host)
1084 {
1085 	int err, i, funcs;
1086 	u32 ocr, rocr;
1087 	struct mmc_card *card;
1088 
1089 	BUG_ON(!host);
1090 	WARN_ON(!host->claimed);
1091 
1092 	err = mmc_send_io_op_cond(host, 0, &ocr);
1093 	if (err)
1094 		return err;
1095 
1096 	mmc_attach_bus(host, &mmc_sdio_ops);
1097 	if (host->ocr_avail_sdio)
1098 		host->ocr_avail = host->ocr_avail_sdio;
1099 
1100 
1101 	rocr = mmc_select_voltage(host, ocr);
1102 
1103 	/*
1104 	 * Can we support the voltage(s) of the card(s)?
1105 	 */
1106 	if (!rocr) {
1107 		err = -EINVAL;
1108 		goto err;
1109 	}
1110 
1111 	/*
1112 	 * Detect and init the card.
1113 	 */
1114 	err = mmc_sdio_init_card(host, rocr, NULL, 0);
1115 	if (err)
1116 		goto err;
1117 
1118 	card = host->card;
1119 
1120 	/*
1121 	 * Enable runtime PM only if supported by host+card+board
1122 	 */
1123 	if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1124 		/*
1125 		 * Let runtime PM core know our card is active
1126 		 */
1127 		err = pm_runtime_set_active(&card->dev);
1128 		if (err)
1129 			goto remove;
1130 
1131 		/*
1132 		 * Enable runtime PM for this card
1133 		 */
1134 		pm_runtime_enable(&card->dev);
1135 	}
1136 
1137 	/*
1138 	 * The number of functions on the card is encoded inside
1139 	 * the ocr.
1140 	 */
1141 	funcs = (ocr & 0x70000000) >> 28;
1142 	card->sdio_funcs = 0;
1143 
1144 	/*
1145 	 * Initialize (but don't add) all present functions.
1146 	 */
1147 	for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1148 		err = sdio_init_func(host->card, i + 1);
1149 		if (err)
1150 			goto remove;
1151 
1152 		/*
1153 		 * Enable Runtime PM for this func (if supported)
1154 		 */
1155 		if (host->caps & MMC_CAP_POWER_OFF_CARD)
1156 			pm_runtime_enable(&card->sdio_func[i]->dev);
1157 	}
1158 
1159 	/*
1160 	 * First add the card to the driver model...
1161 	 */
1162 	mmc_release_host(host);
1163 	err = mmc_add_card(host->card);
1164 	if (err)
1165 		goto remove_added;
1166 
1167 	/*
1168 	 * ...then the SDIO functions.
1169 	 */
1170 	for (i = 0;i < funcs;i++) {
1171 		err = sdio_add_func(host->card->sdio_func[i]);
1172 		if (err)
1173 			goto remove_added;
1174 	}
1175 
1176 	mmc_claim_host(host);
1177 	return 0;
1178 
1179 
1180 remove_added:
1181 	/* Remove without lock if the device has been added. */
1182 	mmc_sdio_remove(host);
1183 	mmc_claim_host(host);
1184 remove:
1185 	/* And with lock if it hasn't been added. */
1186 	mmc_release_host(host);
1187 	if (host->card)
1188 		mmc_sdio_remove(host);
1189 	mmc_claim_host(host);
1190 err:
1191 	mmc_detach_bus(host);
1192 
1193 	pr_err("%s: error %d whilst initialising SDIO card\n",
1194 		mmc_hostname(host), err);
1195 
1196 	return err;
1197 }
1198 
1199