summaryrefslogtreecommitdiff
path: root/drivers/mmc/host/sdhci-s3c.c
blob: 926aaf6acc678d43e7abc28e96890c18886d6563 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
/* linux/drivers/mmc/host/sdhci-s3c.c
 *
 * Copyright 2008 Openmoko Inc.
 * Copyright 2008 Simtec Electronics
 *      Ben Dooks <ben@simtec.co.uk>
 *      http://armlinux.simtec.co.uk/
 *
 * SDHCI (HSMMC) support for Samsung SoC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/platform_data/mmc-sdhci-s3c.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>

#include <linux/mmc/host.h>

#include "sdhci-s3c-regs.h"
#include "sdhci.h"

#define MAX_BUS_CLK	(4)

/* Number of gpio's used is max data bus width + command and clock lines */
#define NUM_GPIOS(x)	(x + 2)

/**
 * struct sdhci_s3c - S3C SDHCI instance
 * @host: The SDHCI host created
 * @pdev: The platform device we where created from.
 * @ioarea: The resource created when we claimed the IO area.
 * @pdata: The platform data for this controller.
 * @cur_clk: The index of the current bus clock.
 * @clk_io: The clock for the internal bus interface.
 * @clk_bus: The clocks that are available for the SD/MMC bus clock.
 */
struct sdhci_s3c {
	struct sdhci_host	*host;
	struct platform_device	*pdev;
	struct resource		*ioarea;
	struct s3c_sdhci_platdata *pdata;
	unsigned int		cur_clk;
	int			ext_cd_irq;
	int			ext_cd_gpio;

	struct clk		*clk_io;
	struct clk		*clk_bus[MAX_BUS_CLK];
};

/**
 * struct sdhci_s3c_driver_data - S3C SDHCI platform specific driver data
 * @sdhci_quirks: sdhci host specific quirks.
 *
 * Specifies platform specific configuration of sdhci controller.
 * Note: A structure for driver specific platform data is used for future
 * expansion of its usage.
 */
struct sdhci_s3c_drv_data {
	unsigned int	sdhci_quirks;
};

static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
{
	return sdhci_priv(host);
}

/**
 * get_curclk - convert ctrl2 register to clock source number
 * @ctrl2: Control2 register value.
 */
static u32 get_curclk(u32 ctrl2)
{
	ctrl2 &= S3C_SDHCI_CTRL2_SELBASECLK_MASK;
	ctrl2 >>= S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;

	return ctrl2;
}

static void sdhci_s3c_check_sclk(struct sdhci_host *host)
{
	struct sdhci_s3c *ourhost = to_s3c(host);
	u32 tmp = readl(host->ioaddr + S3C_SDHCI_CONTROL2);

	if (get_curclk(tmp) != ourhost->cur_clk) {
		dev_dbg(&ourhost->pdev->dev, "restored ctrl2 clock setting\n");

		tmp &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
		tmp |= ourhost->cur_clk << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
		writel(tmp, host->ioaddr + S3C_SDHCI_CONTROL2);
	}
}

/**
 * sdhci_s3c_get_max_clk - callback to get maximum clock frequency.
 * @host: The SDHCI host instance.
 *
 * Callback to return the maximum clock rate acheivable by the controller.
*/
static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host)
{
	struct sdhci_s3c *ourhost = to_s3c(host);
	struct clk *busclk;
	unsigned int rate, max;
	int clk;

	/* note, a reset will reset the clock source */

	sdhci_s3c_check_sclk(host);

	for (max = 0, clk = 0; clk < MAX_BUS_CLK; clk++) {
		busclk = ourhost->clk_bus[clk];
		if (!busclk)
			continue;

		rate = clk_get_rate(busclk);
		if (rate > max)
			max = rate;
	}

	return max;
}

/**
 * sdhci_s3c_consider_clock - consider one the bus clocks for current setting
 * @ourhost: Our SDHCI instance.
 * @src: The source clock index.
 * @wanted: The clock frequency wanted.
 */
static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
					     unsigned int src,
					     unsigned int wanted)
{
	unsigned long rate;
	struct clk *clksrc = ourhost->clk_bus[src];
	int div;

	if (!clksrc)
		return UINT_MAX;

	/*
	 * If controller uses a non-standard clock division, find the best clock
	 * speed possible with selected clock source and skip the division.
	 */
	if (ourhost->host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK) {
		rate = clk_round_rate(clksrc, wanted);
		return wanted - rate;
	}

	rate = clk_get_rate(clksrc);

	for (div = 1; div < 256; div *= 2) {
		if ((rate / div) <= wanted)
			break;
	}

	dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
		src, rate, wanted, rate / div);

	return wanted - (rate / div);
}

/**
 * sdhci_s3c_set_clock - callback on clock change
 * @host: The SDHCI host being changed
 * @clock: The clock rate being requested.
 *
 * When the card's clock is going to be changed, look at the new frequency
 * and find the best clock source to go with it.
*/
static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
{
	struct sdhci_s3c *ourhost = to_s3c(host);
	unsigned int best = UINT_MAX;
	unsigned int delta;
	int best_src = 0;
	int src;
	u32 ctrl;

	/* don't bother if the clock is going off. */
	if (clock == 0)
		return;

	for (src = 0; src < MAX_BUS_CLK; src++) {
		delta = sdhci_s3c_consider_clock(ourhost, src, clock);
		if (delta < best) {
			best = delta;
			best_src = src;
		}
	}

	dev_dbg(&ourhost->pdev->dev,
		"selected source %d, clock %d, delta %d\n",
		 best_src, clock, best);

	/* select the new clock source */
	if (ourhost->cur_clk != best_src) {
		struct clk *clk = ourhost->clk_bus[best_src];

		clk_prepare_enable(clk);
		clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);

		/* turn clock off to card before changing clock source */
		writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);

		ourhost->cur_clk = best_src;
		host->max_clk = clk_get_rate(clk);

		ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
		ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
		ctrl |= best_src << S3C_SDHCI_CTRL2_SELBASECLK_SHIFT;
		writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);
	}

	/* reprogram default hardware configuration */
	writel(S3C64XX_SDHCI_CONTROL4_DRIVE_9mA,
		host->ioaddr + S3C64XX_SDHCI_CONTROL4);

	ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
	ctrl |= (S3C64XX_SDHCI_CTRL2_ENSTAASYNCCLR |
		  S3C64XX_SDHCI_CTRL2_ENCMDCNFMSK |
		  S3C_SDHCI_CTRL2_ENFBCLKRX |
		  S3C_SDHCI_CTRL2_DFCNT_NONE |
		  S3C_SDHCI_CTRL2_ENCLKOUTHOLD);
	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL2);

	/* reconfigure the controller for new clock rate */
	ctrl = (S3C_SDHCI_CTRL3_FCSEL1 | S3C_SDHCI_CTRL3_FCSEL0);
	if (clock < 25 * 1000000)
		ctrl |= (S3C_SDHCI_CTRL3_FCSEL3 | S3C_SDHCI_CTRL3_FCSEL2);
	writel(ctrl, host->ioaddr + S3C_SDHCI_CONTROL3);
}

/**
 * sdhci_s3c_get_min_clock - callback to get minimal supported clock value
 * @host: The SDHCI host being queried
 *
 * To init mmc host properly a minimal clock value is needed. For high system
 * bus clock's values the standard formula gives values out of allowed range.
 * The clock still can be set to lower values, if clock source other then
 * system bus is selected.
*/
static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host)
{
	struct sdhci_s3c *ourhost = to_s3c(host);
	unsigned int delta, min = UINT_MAX;
	int src;

	for (src = 0; src < MAX_BUS_CLK; src++) {
		delta = sdhci_s3c_consider_clock(ourhost, src, 0);
		if (delta == UINT_MAX)
			continue;
		/* delta is a negative value in this case */
		if (-delta < min)
			min = -delta;
	}
	return min;
}

/* sdhci_cmu_get_max_clk - callback to get maximum clock frequency.*/
static unsigned int sdhci_cmu_get_max_clock(struct sdhci_host *host)
{
	struct sdhci_s3c *ourhost = to_s3c(host);

	return clk_round_rate(ourhost->clk_bus[ourhost->cur_clk], UINT_MAX);
}

/* sdhci_cmu_get_min_clock - callback to get minimal supported clock value. */
static unsigned int sdhci_cmu_get_min_clock(struct sdhci_host *host)
{
	struct sdhci_s3c *ourhost = to_s3c(host);

	/*
	 * initial clock can be in the frequency range of
	 * 100KHz-400KHz, so we set it as max value.
	 */
	return clk_round_rate(ourhost->clk_bus[ourhost->cur_clk], 400000);
}

/* sdhci_cmu_set_clock - callback on clock change.*/
static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
{
	struct sdhci_s3c *ourhost = to_s3c(host);
	struct device *dev = &ourhost->pdev->dev;
	unsigned long timeout;
	u16 clk = 0;

	/* don't bother if the clock is going off */
	if (clock == 0)
		return;

	sdhci_s3c_set_clock(host, clock);

	clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);

	host->clock = clock;

	clk = SDHCI_CLOCK_INT_EN;
	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);

	/* Wait max 20 ms */
	timeout = 20;
	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
		& SDHCI_CLOCK_INT_STABLE)) {
		if (timeout == 0) {
			dev_err(dev, "%s: Internal clock never stabilised.\n",
				mmc_hostname(host->mmc));
			return;
		}
		timeout--;
		mdelay(1);
	}

	clk |= SDHCI_CLOCK_CARD_EN;
	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
}

/**
 * sdhci_s3c_platform_bus_width - support 8bit buswidth
 * @host: The SDHCI host being queried
 * @width: MMC_BUS_WIDTH_ macro for the bus width being requested
 *
 * We have 8-bit width support but is not a v3 controller.
 * So we add platform_bus_width() and support 8bit width.
 */
static int sdhci_s3c_platform_bus_width(struct sdhci_host *host, int width)
{
	u8 ctrl;

	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);

	switch (width) {
	case MMC_BUS_WIDTH_8:
		ctrl |= SDHCI_CTRL_8BITBUS;
		ctrl &= ~SDHCI_CTRL_4BITBUS;
		break;
	case MMC_BUS_WIDTH_4:
		ctrl |= SDHCI_CTRL_4BITBUS;
		ctrl &= ~SDHCI_CTRL_8BITBUS;
		break;
	default:
		ctrl &= ~SDHCI_CTRL_4BITBUS;
		ctrl &= ~SDHCI_CTRL_8BITBUS;
		break;
	}

	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);

	return 0;
}

static struct sdhci_ops sdhci_s3c_ops = {
	.get_max_clock		= sdhci_s3c_get_max_clk,
	.set_clock		= sdhci_s3c_set_clock,
	.get_min_clock		= sdhci_s3c_get_min_clock,
	.platform_bus_width	= sdhci_s3c_platform_bus_width,
};

static void sdhci_s3c_notify_change(struct platform_device *dev, int state)
{
	struct sdhci_host *host = platform_get_drvdata(dev);
#ifdef CONFIG_PM_RUNTIME
	struct sdhci_s3c *sc = sdhci_priv(host);
#endif
	unsigned long flags;

	if (host) {
		spin_lock_irqsave(&host->lock, flags);
		if (state) {
			dev_dbg(&dev->dev, "card inserted.\n");
#ifdef CONFIG_PM_RUNTIME
			clk_prepare_enable(sc->clk_io);
#endif
			host->flags &= ~SDHCI_DEVICE_DEAD;
			host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
		} else {
			dev_dbg(&dev->dev, "card removed.\n");
			host->flags |= SDHCI_DEVICE_DEAD;
			host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
#ifdef CONFIG_PM_RUNTIME
			clk_disable_unprepare(sc->clk_io);
#endif
		}
		tasklet_schedule(&host->card_tasklet);
		spin_unlock_irqrestore(&host->lock, flags);
	}
}

static irqreturn_t sdhci_s3c_gpio_card_detect_thread(int irq, void *dev_id)
{
	struct sdhci_s3c *sc = dev_id;
	int status = gpio_get_value(sc->ext_cd_gpio);
	if (sc->pdata->ext_cd_gpio_invert)
		status = !status;
	sdhci_s3c_notify_change(sc->pdev, status);
	return IRQ_HANDLED;
}

static void sdhci_s3c_setup_card_detect_gpio(struct sdhci_s3c *sc)
{
	struct s3c_sdhci_platdata *pdata = sc->pdata;
	struct device *dev = &sc->pdev->dev;

	if (devm_gpio_request(dev, pdata->ext_cd_gpio, "SDHCI EXT CD") == 0) {
		sc->ext_cd_gpio = pdata->ext_cd_gpio;
		sc->ext_cd_irq = gpio_to_irq(pdata->ext_cd_gpio);
		if (sc->ext_cd_irq &&
		    request_threaded_irq(sc->ext_cd_irq, NULL,
					 sdhci_s3c_gpio_card_detect_thread,
					 IRQF_TRIGGER_RISING |
					 IRQF_TRIGGER_FALLING |
					 IRQF_ONESHOT,
					 dev_name(dev), sc) == 0) {
			int status = gpio_get_value(sc->ext_cd_gpio);
			if (pdata->ext_cd_gpio_invert)
				status = !status;
			sdhci_s3c_notify_change(sc->pdev, status);
		} else {
			dev_warn(dev, "cannot request irq for card detect\n");
			sc->ext_cd_irq = 0;
		}
	} else {
		dev_err(dev, "cannot request gpio for card detect\n");
	}
}

#ifdef CONFIG_OF
static int sdhci_s3c_parse_dt(struct device *dev,
		struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
{
	struct device_node *node = dev->of_node;
	struct sdhci_s3c *ourhost = to_s3c(host);
	u32 max_width;
	int gpio;

	/* if the bus-width property is not specified, assume width as 1 */
	if (of_property_read_u32(node, "bus-width", &max_width))
		max_width = 1;
	pdata->max_width = max_width;

	/* get the card detection method */
	if (of_get_property(node, "broken-cd", NULL)) {
		pdata->cd_type = S3C_SDHCI_CD_NONE;
		return 0;
	}

	if (of_get_property(node, "non-removable", NULL)) {
		pdata->cd_type = S3C_SDHCI_CD_PERMANENT;
		return 0;
	}

	gpio = of_get_named_gpio(node, "cd-gpios", 0);
	if (gpio_is_valid(gpio)) {
		pdata->cd_type = S3C_SDHCI_CD_GPIO;
		pdata->ext_cd_gpio = gpio;
		ourhost->ext_cd_gpio = -1;
		if (of_get_property(node, "cd-inverted", NULL))
			pdata->ext_cd_gpio_invert = 1;
		return 0;
	} else if (gpio != -ENOENT) {
		dev_err(dev, "invalid card detect gpio specified\n");
		return -EINVAL;
	}

	/* assuming internal card detect that will be configured by pinctrl */
	pdata->cd_type = S3C_SDHCI_CD_INTERNAL;
	return 0;
}
#else
static int sdhci_s3c_parse_dt(struct device *dev,
		struct sdhci_host *host, struct s3c_sdhci_platdata *pdata)
{
	return -EINVAL;
}
#endif

static const struct of_device_id sdhci_s3c_dt_match[];

static inline struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
			struct platform_device *pdev)
{
#ifdef CONFIG_OF
	if (pdev->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_node(sdhci_s3c_dt_match, pdev->dev.of_node);
		return (struct sdhci_s3c_drv_data *)match->data;
	}
#endif
	return (struct sdhci_s3c_drv_data *)
			platform_get_device_id(pdev)->driver_data;
}

static int sdhci_s3c_probe(struct platform_device *pdev)
{
	struct s3c_sdhci_platdata *pdata;
	struct sdhci_s3c_drv_data *drv_data;
	struct device *dev = &pdev->dev;
	struct sdhci_host *host;
	struct sdhci_s3c *sc;
	struct resource *res;
	int ret, irq, ptr, clks;

	if (!pdev->dev.platform_data && !pdev->dev.of_node) {
		dev_err(dev, "no device data specified\n");
		return -ENOENT;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(dev, "no irq specified\n");
		return irq;
	}

	host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
	if (IS_ERR(host)) {
		dev_err(dev, "sdhci_alloc_host() failed\n");
		return PTR_ERR(host);
	}
	sc = sdhci_priv(host);

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
		ret = -ENOMEM;
		goto err_pdata_io_clk;
	}

	if (pdev->dev.of_node) {
		ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);
		if (ret)
			goto err_pdata_io_clk;
	} else {
		memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
		sc->ext_cd_gpio = -1; /* invalid gpio number */
	}

	drv_data = sdhci_s3c_get_driver_data(pdev);

	sc->host = host;
	sc->pdev = pdev;
	sc->pdata = pdata;

	platform_set_drvdata(pdev, host);

	sc->clk_io = devm_clk_get(dev, "hsmmc");
	if (IS_ERR(sc->clk_io)) {
		dev_err(dev, "failed to get io clock\n");
		ret = PTR_ERR(sc->clk_io);
		goto err_pdata_io_clk;
	}

	/* enable the local io clock and keep it running for the moment. */
	clk_prepare_enable(sc->clk_io);

	for (clks = 0, ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
		struct clk *clk;
		char name[14];

		snprintf(name, 14, "mmc_busclk.%d", ptr);
		clk = devm_clk_get(dev, name);
		if (IS_ERR(clk))
			continue;

		clks++;
		sc->clk_bus[ptr] = clk;

		/*
		 * save current clock index to know which clock bus
		 * is used later in overriding functions.
		 */
		sc->cur_clk = ptr;

		dev_info(dev, "clock source %d: %s (%ld Hz)\n",
			 ptr, name, clk_get_rate(clk));
	}

	if (clks == 0) {
		dev_err(dev, "failed to find any bus clocks\n");
		ret = -ENOENT;
		goto err_no_busclks;
	}

#ifndef CONFIG_PM_RUNTIME
	clk_prepare_enable(sc->clk_bus[sc->cur_clk]);
#endif

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	host->ioaddr = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(host->ioaddr)) {
		ret = PTR_ERR(host->ioaddr);
		goto err_req_regs;
	}

	/* Ensure we have minimal gpio selected CMD/CLK/Detect */
	if (pdata->cfg_gpio)
		pdata->cfg_gpio(pdev, pdata->max_width);

	host->hw_name = "samsung-hsmmc";
	host->ops = &sdhci_s3c_ops;
	host->quirks = 0;
	host->irq = irq;

	/* Setup quirks for the controller */
	host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
	host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
	if (drv_data)
		host->quirks |= drv_data->sdhci_quirks;

#ifndef CONFIG_MMC_SDHCI_S3C_DMA

	/* we currently see overruns on errors, so disable the SDMA
	 * support as well. */
	host->quirks |= SDHCI_QUIRK_BROKEN_DMA;

#endif /* CONFIG_MMC_SDHCI_S3C_DMA */

	/* It seems we do not get an DATA transfer complete on non-busy
	 * transfers, not sure if this is a problem with this specific
	 * SDHCI block, or a missing configuration that needs to be set. */
	host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ;

	/* This host supports the Auto CMD12 */
	host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;

	/* Samsung SoCs need BROKEN_ADMA_ZEROLEN_DESC */
	host->quirks |= SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC;

	if (pdata->cd_type == S3C_SDHCI_CD_NONE ||
	    pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
		host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;

	if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
		host->mmc->caps = MMC_CAP_NONREMOVABLE;

	switch (pdata->max_width) {
	case 8:
		host->mmc->caps |= MMC_CAP_8_BIT_DATA;
	case 4:
		host->mmc->caps |= MMC_CAP_4_BIT_DATA;
		break;
	}

	if (pdata->pm_caps)
		host->mmc->pm_caps |= pdata->pm_caps;

	host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
			 SDHCI_QUIRK_32BIT_DMA_SIZE);

	/* HSMMC on Samsung SoCs uses SDCLK as timeout clock */
	host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK;

	/*
	 * If controller does not have internal clock divider,
	 * we can use overriding functions instead of default.
	 */
	if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK) {
		sdhci_s3c_ops.set_clock = sdhci_cmu_set_clock;
		sdhci_s3c_ops.get_min_clock = sdhci_cmu_get_min_clock;
		sdhci_s3c_ops.get_max_clock = sdhci_cmu_get_max_clock;
	}

	/* It supports additional host capabilities if needed */
	if (pdata->host_caps)
		host->mmc->caps |= pdata->host_caps;

	if (pdata->host_caps2)
		host->mmc->caps2 |= pdata->host_caps2;

	pm_runtime_enable(&pdev->dev);
	pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
	pm_runtime_use_autosuspend(&pdev->dev);
	pm_suspend_ignore_children(&pdev->dev, 1);

	ret = sdhci_add_host(host);
	if (ret) {
		dev_err(dev, "sdhci_add_host() failed\n");
		pm_runtime_forbid(&pdev->dev);
		pm_runtime_get_noresume(&pdev->dev);
		goto err_req_regs;
	}

	/* The following two methods of card detection might call
	   sdhci_s3c_notify_change() immediately, so they can be called
	   only after sdhci_add_host(). Setup errors are ignored. */
	if (pdata->cd_type == S3C_SDHCI_CD_EXTERNAL && pdata->ext_cd_init)
		pdata->ext_cd_init(&sdhci_s3c_notify_change);
	if (pdata->cd_type == S3C_SDHCI_CD_GPIO &&
	    gpio_is_valid(pdata->ext_cd_gpio))
		sdhci_s3c_setup_card_detect_gpio(sc);

#ifdef CONFIG_PM_RUNTIME
	if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
		clk_disable_unprepare(sc->clk_io);
#endif
	return 0;

 err_req_regs:
#ifndef CONFIG_PM_RUNTIME
	clk_disable_unprepare(sc->clk_bus[sc->cur_clk]);
#endif

 err_no_busclks:
	clk_disable_unprepare(sc->clk_io);

 err_pdata_io_clk:
	sdhci_free_host(host);

	return ret;
}

static int sdhci_s3c_remove(struct platform_device *pdev)
{
	struct sdhci_host *host =  platform_get_drvdata(pdev);
	struct sdhci_s3c *sc = sdhci_priv(host);
	struct s3c_sdhci_platdata *pdata = sc->pdata;

	if (pdata->cd_type == S3C_SDHCI_CD_EXTERNAL && pdata->ext_cd_cleanup)
		pdata->ext_cd_cleanup(&sdhci_s3c_notify_change);

	if (sc->ext_cd_irq)
		free_irq(sc->ext_cd_irq, sc);

#ifdef CONFIG_PM_RUNTIME
	if (pdata->cd_type != S3C_SDHCI_CD_INTERNAL)
		clk_prepare_enable(sc->clk_io);
#endif
	sdhci_remove_host(host, 1);

	pm_runtime_dont_use_autosuspend(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

#ifndef CONFIG_PM_RUNTIME
	clk_disable_unprepare(sc->clk_bus[sc->cur_clk]);
#endif
	clk_disable_unprepare(sc->clk_io);

	sdhci_free_host(host);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int sdhci_s3c_suspend(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);

	return sdhci_suspend_host(host);
}

static int sdhci_s3c_resume(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);

	return sdhci_resume_host(host);
}
#endif

#ifdef CONFIG_PM_RUNTIME
static int sdhci_s3c_runtime_suspend(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_s3c *ourhost = to_s3c(host);
	struct clk *busclk = ourhost->clk_io;
	int ret;

	ret = sdhci_runtime_suspend_host(host);

	clk_disable_unprepare(ourhost->clk_bus[ourhost->cur_clk]);
	clk_disable_unprepare(busclk);
	return ret;
}

static int sdhci_s3c_runtime_resume(struct device *dev)
{
	struct sdhci_host *host = dev_get_drvdata(dev);
	struct sdhci_s3c *ourhost = to_s3c(host);
	struct clk *busclk = ourhost->clk_io;
	int ret;

	clk_prepare_enable(busclk);
	clk_prepare_enable(ourhost->clk_bus[ourhost->cur_clk]);
	ret = sdhci_runtime_resume_host(host);
	return ret;
}
#endif

#ifdef CONFIG_PM
static const struct dev_pm_ops sdhci_s3c_pmops = {
	SET_SYSTEM_SLEEP_PM_OPS(sdhci_s3c_suspend, sdhci_s3c_resume)
	SET_RUNTIME_PM_OPS(sdhci_s3c_runtime_suspend, sdhci_s3c_runtime_resume,
			   NULL)
};

#define SDHCI_S3C_PMOPS (&sdhci_s3c_pmops)

#else
#define SDHCI_S3C_PMOPS NULL
#endif

#if defined(CONFIG_CPU_EXYNOS4210) || defined(CONFIG_SOC_EXYNOS4212)
static struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
	.sdhci_quirks = SDHCI_QUIRK_NONSTANDARD_CLOCK,
};
#define EXYNOS4_SDHCI_DRV_DATA ((kernel_ulong_t)&exynos4_sdhci_drv_data)
#else
#define EXYNOS4_SDHCI_DRV_DATA ((kernel_ulong_t)NULL)
#endif

static struct platform_device_id sdhci_s3c_driver_ids[] = {
	{
		.name		= "s3c-sdhci",
		.driver_data	= (kernel_ulong_t)NULL,
	}, {
		.name		= "exynos4-sdhci",
		.driver_data	= EXYNOS4_SDHCI_DRV_DATA,
	},
	{ }
};
MODULE_DEVICE_TABLE(platform, sdhci_s3c_driver_ids);

#ifdef CONFIG_OF
static const struct of_device_id sdhci_s3c_dt_match[] = {
	{ .compatible = "samsung,s3c6410-sdhci", },
	{ .compatible = "samsung,exynos4210-sdhci",
		.data = (void *)EXYNOS4_SDHCI_DRV_DATA },
	{},
};
MODULE_DEVICE_TABLE(of, sdhci_s3c_dt_match);
#endif

static struct platform_driver sdhci_s3c_driver = {
	.probe		= sdhci_s3c_probe,
	.remove		= sdhci_s3c_remove,
	.id_table	= sdhci_s3c_driver_ids,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "s3c-sdhci",
		.of_match_table = of_match_ptr(sdhci_s3c_dt_match),
		.pm	= SDHCI_S3C_PMOPS,
	},
};

module_platform_driver(sdhci_s3c_driver);

MODULE_DESCRIPTION("Samsung SDHCI (HSMMC) glue");
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:s3c-sdhci");