summaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/mmci.c
blob: 705a5894a6bbae304a76b37f649ee0be474b89c4 (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
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
/*
 *  linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
 *
 *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
 *
 * 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/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/log2.h>
#include <linux/mmc/host.h>
#include <linux/amba/bus.h>
#include <linux/clk.h>
#include <linux/scatterlist.h>
#include <linux/gpio.h>
#include <linux/amba/mmci.h>
#include <linux/regulator/consumer.h>

#include <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/io.h>
#include <asm/sizes.h>

#include "mmci.h"

#define DRIVER_NAME "mmci-pl18x"

#define DBG(host,fmt,args...)	\
	pr_debug("%s: %s: " fmt, mmc_hostname(host->mmc), __func__ , args)

static unsigned int fmax = 515633;

/*
 * This must be called with host->lock held
 */
static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
{
	u32 clk = 0;

	if (desired) {
		if (desired >= host->mclk) {
			clk = MCI_CLK_BYPASS;
			host->cclk = host->mclk;
		} else {
			clk = host->mclk / (2 * desired) - 1;
			if (clk >= 256)
				clk = 255;
			host->cclk = host->mclk / (2 * (clk + 1));
		}
		if (host->hw_designer == 0x80)
			clk |= MCI_FCEN; /* Bug fix in ST IP block */
		clk |= MCI_CLK_ENABLE;
		/* This hasn't proven to be worthwhile */
		/* clk |= MCI_CLK_PWRSAVE; */
	}

	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
		clk |= MCI_WIDE_BUS;

	writel(clk, host->base + MMCICLOCK);
}

static void
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
{
	writel(0, host->base + MMCICOMMAND);

	BUG_ON(host->data);

	host->mrq = NULL;
	host->cmd = NULL;

	if (mrq->data)
		mrq->data->bytes_xfered = host->data_xfered;

	/*
	 * Need to drop the host lock here; mmc_request_done may call
	 * back into the driver...
	 */
	spin_unlock(&host->lock);
	mmc_request_done(host->mmc, mrq);
	spin_lock(&host->lock);
}

static void mmci_stop_data(struct mmci_host *host)
{
	writel(0, host->base + MMCIDATACTRL);
	writel(0, host->base + MMCIMASK1);
	host->data = NULL;
}

static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
{
	unsigned int datactrl, timeout, irqmask;
	unsigned long long clks;
	void __iomem *base;
	int blksz_bits;

	DBG(host, "blksz %04x blks %04x flags %08x\n",
	    data->blksz, data->blocks, data->flags);

	host->data = data;
	host->size = data->blksz;
	host->data_xfered = 0;

	mmci_init_sg(host, data);

	clks = (unsigned long long)data->timeout_ns * host->cclk;
	do_div(clks, 1000000000UL);

	timeout = data->timeout_clks + (unsigned int)clks;

	base = host->base;
	writel(timeout, base + MMCIDATATIMER);
	writel(host->size, base + MMCIDATALENGTH);

	blksz_bits = ffs(data->blksz) - 1;
	BUG_ON(1 << blksz_bits != data->blksz);

	datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
	if (data->flags & MMC_DATA_READ) {
		datactrl |= MCI_DPSM_DIRECTION;
		irqmask = MCI_RXFIFOHALFFULLMASK;

		/*
		 * If we have less than a FIFOSIZE of bytes to transfer,
		 * trigger a PIO interrupt as soon as any data is available.
		 */
		if (host->size < MCI_FIFOSIZE)
			irqmask |= MCI_RXDATAAVLBLMASK;
	} else {
		/*
		 * We don't actually need to include "FIFO empty" here
		 * since its implicit in "FIFO half empty".
		 */
		irqmask = MCI_TXFIFOHALFEMPTYMASK;
	}

	writel(datactrl, base + MMCIDATACTRL);
	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
	writel(irqmask, base + MMCIMASK1);
}

static void
mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
{
	void __iomem *base = host->base;

	DBG(host, "op %02x arg %08x flags %08x\n",
	    cmd->opcode, cmd->arg, cmd->flags);

	if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
		writel(0, base + MMCICOMMAND);
		udelay(1);
	}

	c |= cmd->opcode | MCI_CPSM_ENABLE;
	if (cmd->flags & MMC_RSP_PRESENT) {
		if (cmd->flags & MMC_RSP_136)
			c |= MCI_CPSM_LONGRSP;
		c |= MCI_CPSM_RESPONSE;
	}
	if (/*interrupt*/0)
		c |= MCI_CPSM_INTERRUPT;

	host->cmd = cmd;

	writel(cmd->arg, base + MMCIARGUMENT);
	writel(c, base + MMCICOMMAND);
}

static void
mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
	      unsigned int status)
{
	if (status & MCI_DATABLOCKEND) {
		host->data_xfered += data->blksz;
	}
	if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
		if (status & MCI_DATACRCFAIL)
			data->error = -EILSEQ;
		else if (status & MCI_DATATIMEOUT)
			data->error = -ETIMEDOUT;
		else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
			data->error = -EIO;
		status |= MCI_DATAEND;

		/*
		 * We hit an error condition.  Ensure that any data
		 * partially written to a page is properly coherent.
		 */
		if (host->sg_len && data->flags & MMC_DATA_READ)
			flush_dcache_page(sg_page(host->sg_ptr));
	}
	if (status & MCI_DATAEND) {
		mmci_stop_data(host);

		if (!data->stop) {
			mmci_request_end(host, data->mrq);
		} else {
			mmci_start_command(host, data->stop, 0);
		}
	}
}

static void
mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
	     unsigned int status)
{
	void __iomem *base = host->base;

	host->cmd = NULL;

	cmd->resp[0] = readl(base + MMCIRESPONSE0);
	cmd->resp[1] = readl(base + MMCIRESPONSE1);
	cmd->resp[2] = readl(base + MMCIRESPONSE2);
	cmd->resp[3] = readl(base + MMCIRESPONSE3);

	if (status & MCI_CMDTIMEOUT) {
		cmd->error = -ETIMEDOUT;
	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
		cmd->error = -EILSEQ;
	}

	if (!cmd->data || cmd->error) {
		if (host->data)
			mmci_stop_data(host);
		mmci_request_end(host, cmd->mrq);
	} else if (!(cmd->data->flags & MMC_DATA_READ)) {
		mmci_start_data(host, cmd->data);
	}
}

static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
{
	void __iomem *base = host->base;
	char *ptr = buffer;
	u32 status;
	int host_remain = host->size;

	do {
		int count = host_remain - (readl(base + MMCIFIFOCNT) << 2);

		if (count > remain)
			count = remain;

		if (count <= 0)
			break;

		readsl(base + MMCIFIFO, ptr, count >> 2);

		ptr += count;
		remain -= count;
		host_remain -= count;

		if (remain == 0)
			break;

		status = readl(base + MMCISTATUS);
	} while (status & MCI_RXDATAAVLBL);

	return ptr - buffer;
}

static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
{
	void __iomem *base = host->base;
	char *ptr = buffer;

	do {
		unsigned int count, maxcnt;

		maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE : MCI_FIFOHALFSIZE;
		count = min(remain, maxcnt);

		writesl(base + MMCIFIFO, ptr, count >> 2);

		ptr += count;
		remain -= count;

		if (remain == 0)
			break;

		status = readl(base + MMCISTATUS);
	} while (status & MCI_TXFIFOHALFEMPTY);

	return ptr - buffer;
}

/*
 * PIO data transfer IRQ handler.
 */
static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
{
	struct mmci_host *host = dev_id;
	void __iomem *base = host->base;
	u32 status;

	status = readl(base + MMCISTATUS);

	DBG(host, "irq1 %08x\n", status);

	do {
		unsigned long flags;
		unsigned int remain, len;
		char *buffer;

		/*
		 * For write, we only need to test the half-empty flag
		 * here - if the FIFO is completely empty, then by
		 * definition it is more than half empty.
		 *
		 * For read, check for data available.
		 */
		if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
			break;

		/*
		 * Map the current scatter buffer.
		 */
		buffer = mmci_kmap_atomic(host, &flags) + host->sg_off;
		remain = host->sg_ptr->length - host->sg_off;

		len = 0;
		if (status & MCI_RXACTIVE)
			len = mmci_pio_read(host, buffer, remain);
		if (status & MCI_TXACTIVE)
			len = mmci_pio_write(host, buffer, remain, status);

		/*
		 * Unmap the buffer.
		 */
		mmci_kunmap_atomic(host, buffer, &flags);

		host->sg_off += len;
		host->size -= len;
		remain -= len;

		if (remain)
			break;

		/*
		 * If we were reading, and we have completed this
		 * page, ensure that the data cache is coherent.
		 */
		if (status & MCI_RXACTIVE)
			flush_dcache_page(sg_page(host->sg_ptr));

		if (!mmci_next_sg(host))
			break;

		status = readl(base + MMCISTATUS);
	} while (1);

	/*
	 * If we're nearing the end of the read, switch to
	 * "any data available" mode.
	 */
	if (status & MCI_RXACTIVE && host->size < MCI_FIFOSIZE)
		writel(MCI_RXDATAAVLBLMASK, base + MMCIMASK1);

	/*
	 * If we run out of data, disable the data IRQs; this
	 * prevents a race where the FIFO becomes empty before
	 * the chip itself has disabled the data path, and
	 * stops us racing with our data end IRQ.
	 */
	if (host->size == 0) {
		writel(0, base + MMCIMASK1);
		writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
	}

	return IRQ_HANDLED;
}

/*
 * Handle completion of command and data transfers.
 */
static irqreturn_t mmci_irq(int irq, void *dev_id)
{
	struct mmci_host *host = dev_id;
	u32 status;
	int ret = 0;

	spin_lock(&host->lock);

	do {
		struct mmc_command *cmd;
		struct mmc_data *data;

		status = readl(host->base + MMCISTATUS);
		status &= readl(host->base + MMCIMASK0);
		writel(status, host->base + MMCICLEAR);

		DBG(host, "irq0 %08x\n", status);

		data = host->data;
		if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_TXUNDERRUN|
			      MCI_RXOVERRUN|MCI_DATAEND|MCI_DATABLOCKEND) && data)
			mmci_data_irq(host, data, status);

		cmd = host->cmd;
		if (status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
			mmci_cmd_irq(host, cmd, status);

		ret = 1;
	} while (status);

	spin_unlock(&host->lock);

	return IRQ_RETVAL(ret);
}

static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
	struct mmci_host *host = mmc_priv(mmc);
	unsigned long flags;

	WARN_ON(host->mrq != NULL);

	if (mrq->data && !is_power_of_2(mrq->data->blksz)) {
		printk(KERN_ERR "%s: Unsupported block size (%d bytes)\n",
			mmc_hostname(mmc), mrq->data->blksz);
		mrq->cmd->error = -EINVAL;
		mmc_request_done(mmc, mrq);
		return;
	}

	spin_lock_irqsave(&host->lock, flags);

	host->mrq = mrq;

	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
		mmci_start_data(host, mrq->data);

	mmci_start_command(host, mrq->cmd, 0);

	spin_unlock_irqrestore(&host->lock, flags);
}

static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct mmci_host *host = mmc_priv(mmc);
	u32 pwr = 0;
	unsigned long flags;

	switch (ios->power_mode) {
	case MMC_POWER_OFF:
		if(host->vcc &&
		   regulator_is_enabled(host->vcc))
			regulator_disable(host->vcc);
		break;
	case MMC_POWER_UP:
#ifdef CONFIG_REGULATOR
		if (host->vcc)
			/* This implicitly enables the regulator */
			mmc_regulator_set_ocr(host->vcc, ios->vdd);
#endif
		/*
		 * The translate_vdd function is not used if you have
		 * an external regulator, or your design is really weird.
		 * Using it would mean sending in power control BOTH using
		 * a regulator AND the 4 MMCIPWR bits. If we don't have
		 * a regulator, we might have some other platform specific
		 * power control behind this translate function.
		 */
		if (!host->vcc && host->plat->translate_vdd)
			pwr |= host->plat->translate_vdd(mmc_dev(mmc), ios->vdd);
		/* The ST version does not have this, fall through to POWER_ON */
		if (host->hw_designer != AMBA_VENDOR_ST) {
			pwr |= MCI_PWR_UP;
			break;
		}
	case MMC_POWER_ON:
		pwr |= MCI_PWR_ON;
		break;
	}

	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
		if (host->hw_designer != AMBA_VENDOR_ST)
			pwr |= MCI_ROD;
		else {
			/*
			 * The ST Micro variant use the ROD bit for something
			 * else and only has OD (Open Drain).
			 */
			pwr |= MCI_OD;
		}
	}

	spin_lock_irqsave(&host->lock, flags);

	mmci_set_clkreg(host, ios->clock);

	if (host->pwr != pwr) {
		host->pwr = pwr;
		writel(pwr, host->base + MMCIPOWER);
	}

	spin_unlock_irqrestore(&host->lock, flags);
}

static int mmci_get_ro(struct mmc_host *mmc)
{
	struct mmci_host *host = mmc_priv(mmc);

	if (host->gpio_wp == -ENOSYS)
		return -ENOSYS;

	return gpio_get_value(host->gpio_wp);
}

static int mmci_get_cd(struct mmc_host *mmc)
{
	struct mmci_host *host = mmc_priv(mmc);
	unsigned int status;

	if (host->gpio_cd == -ENOSYS)
		status = host->plat->status(mmc_dev(host->mmc));
	else
		status = gpio_get_value(host->gpio_cd);

	return !status;
}

static const struct mmc_host_ops mmci_ops = {
	.request	= mmci_request,
	.set_ios	= mmci_set_ios,
	.get_ro		= mmci_get_ro,
	.get_cd		= mmci_get_cd,
};

static void mmci_check_status(unsigned long data)
{
	struct mmci_host *host = (struct mmci_host *)data;
	unsigned int status = mmci_get_cd(host->mmc);

	if (status ^ host->oldstat)
		mmc_detect_change(host->mmc, 0);

	host->oldstat = status;
	mod_timer(&host->timer, jiffies + HZ);
}

static int __devinit mmci_probe(struct amba_device *dev, struct amba_id *id)
{
	struct mmci_platform_data *plat = dev->dev.platform_data;
	struct mmci_host *host;
	struct mmc_host *mmc;
	int ret;

	/* must have platform data */
	if (!plat) {
		ret = -EINVAL;
		goto out;
	}

	ret = amba_request_regions(dev, DRIVER_NAME);
	if (ret)
		goto out;

	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
	if (!mmc) {
		ret = -ENOMEM;
		goto rel_regions;
	}

	host = mmc_priv(mmc);
	host->mmc = mmc;

	host->gpio_wp = -ENOSYS;
	host->gpio_cd = -ENOSYS;

	host->hw_designer = amba_manf(dev);
	host->hw_revision = amba_rev(dev);
	DBG(host, "designer ID = 0x%02x\n", host->hw_designer);
	DBG(host, "revision = 0x%01x\n", host->hw_revision);

	host->clk = clk_get(&dev->dev, NULL);
	if (IS_ERR(host->clk)) {
		ret = PTR_ERR(host->clk);
		host->clk = NULL;
		goto host_free;
	}

	ret = clk_enable(host->clk);
	if (ret)
		goto clk_free;

	host->plat = plat;
	host->mclk = clk_get_rate(host->clk);
	/*
	 * According to the spec, mclk is max 100 MHz,
	 * so we try to adjust the clock down to this,
	 * (if possible).
	 */
	if (host->mclk > 100000000) {
		ret = clk_set_rate(host->clk, 100000000);
		if (ret < 0)
			goto clk_disable;
		host->mclk = clk_get_rate(host->clk);
		DBG(host, "eventual mclk rate: %u Hz\n", host->mclk);
	}
	host->base = ioremap(dev->res.start, resource_size(&dev->res));
	if (!host->base) {
		ret = -ENOMEM;
		goto clk_disable;
	}

	mmc->ops = &mmci_ops;
	mmc->f_min = (host->mclk + 511) / 512;
	mmc->f_max = min(host->mclk, fmax);
#ifdef CONFIG_REGULATOR
	/* If we're using the regulator framework, try to fetch a regulator */
	host->vcc = regulator_get(&dev->dev, "vmmc");
	if (IS_ERR(host->vcc))
		host->vcc = NULL;
	else {
		int mask = mmc_regulator_get_ocrmask(host->vcc);

		if (mask < 0)
			dev_err(&dev->dev, "error getting OCR mask (%d)\n",
				mask);
		else {
			host->mmc->ocr_avail = (u32) mask;
			if (plat->ocr_mask)
				dev_warn(&dev->dev,
				 "Provided ocr_mask/setpower will not be used "
				 "(using regulator instead)\n");
		}
	}
#endif
	/* Fall back to platform data if no regulator is found */
	if (host->vcc == NULL)
		mmc->ocr_avail = plat->ocr_mask;
	mmc->caps = plat->capabilities;

	/*
	 * We can do SGIO
	 */
	mmc->max_hw_segs = 16;
	mmc->max_phys_segs = NR_SG;

	/*
	 * Since we only have a 16-bit data length register, we must
	 * ensure that we don't exceed 2^16-1 bytes in a single request.
	 */
	mmc->max_req_size = 65535;

	/*
	 * Set the maximum segment size.  Since we aren't doing DMA
	 * (yet) we are only limited by the data length register.
	 */
	mmc->max_seg_size = mmc->max_req_size;

	/*
	 * Block size can be up to 2048 bytes, but must be a power of two.
	 */
	mmc->max_blk_size = 2048;

	/*
	 * No limit on the number of blocks transferred.
	 */
	mmc->max_blk_count = mmc->max_req_size;

	spin_lock_init(&host->lock);

	writel(0, host->base + MMCIMASK0);
	writel(0, host->base + MMCIMASK1);
	writel(0xfff, host->base + MMCICLEAR);

	if (gpio_is_valid(plat->gpio_cd)) {
		ret = gpio_request(plat->gpio_cd, DRIVER_NAME " (cd)");
		if (ret == 0)
			ret = gpio_direction_input(plat->gpio_cd);
		if (ret == 0)
			host->gpio_cd = plat->gpio_cd;
		else if (ret != -ENOSYS)
			goto err_gpio_cd;
	}
	if (gpio_is_valid(plat->gpio_wp)) {
		ret = gpio_request(plat->gpio_wp, DRIVER_NAME " (wp)");
		if (ret == 0)
			ret = gpio_direction_input(plat->gpio_wp);
		if (ret == 0)
			host->gpio_wp = plat->gpio_wp;
		else if (ret != -ENOSYS)
			goto err_gpio_wp;
	}

	ret = request_irq(dev->irq[0], mmci_irq, IRQF_SHARED, DRIVER_NAME " (cmd)", host);
	if (ret)
		goto unmap;

	ret = request_irq(dev->irq[1], mmci_pio_irq, IRQF_SHARED, DRIVER_NAME " (pio)", host);
	if (ret)
		goto irq0_free;

	writel(MCI_IRQENABLE, host->base + MMCIMASK0);

	amba_set_drvdata(dev, mmc);
	host->oldstat = mmci_get_cd(host->mmc);

	mmc_add_host(mmc);

	printk(KERN_INFO "%s: MMCI rev %x cfg %02x at 0x%016llx irq %d,%d\n",
		mmc_hostname(mmc), amba_rev(dev), amba_config(dev),
		(unsigned long long)dev->res.start, dev->irq[0], dev->irq[1]);

	init_timer(&host->timer);
	host->timer.data = (unsigned long)host;
	host->timer.function = mmci_check_status;
	host->timer.expires = jiffies + HZ;
	add_timer(&host->timer);

	return 0;

 irq0_free:
	free_irq(dev->irq[0], host);
 unmap:
	if (host->gpio_wp != -ENOSYS)
		gpio_free(host->gpio_wp);
 err_gpio_wp:
	if (host->gpio_cd != -ENOSYS)
		gpio_free(host->gpio_cd);
 err_gpio_cd:
	iounmap(host->base);
 clk_disable:
	clk_disable(host->clk);
 clk_free:
	clk_put(host->clk);
 host_free:
	mmc_free_host(mmc);
 rel_regions:
	amba_release_regions(dev);
 out:
	return ret;
}

static int __devexit mmci_remove(struct amba_device *dev)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);

	amba_set_drvdata(dev, NULL);

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		del_timer_sync(&host->timer);

		mmc_remove_host(mmc);

		writel(0, host->base + MMCIMASK0);
		writel(0, host->base + MMCIMASK1);

		writel(0, host->base + MMCICOMMAND);
		writel(0, host->base + MMCIDATACTRL);

		free_irq(dev->irq[0], host);
		free_irq(dev->irq[1], host);

		if (host->gpio_wp != -ENOSYS)
			gpio_free(host->gpio_wp);
		if (host->gpio_cd != -ENOSYS)
			gpio_free(host->gpio_cd);

		iounmap(host->base);
		clk_disable(host->clk);
		clk_put(host->clk);

		if (regulator_is_enabled(host->vcc))
			regulator_disable(host->vcc);
		regulator_put(host->vcc);

		mmc_free_host(mmc);

		amba_release_regions(dev);
	}

	return 0;
}

#ifdef CONFIG_PM
static int mmci_suspend(struct amba_device *dev, pm_message_t state)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);
	int ret = 0;

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		ret = mmc_suspend_host(mmc, state);
		if (ret == 0)
			writel(0, host->base + MMCIMASK0);
	}

	return ret;
}

static int mmci_resume(struct amba_device *dev)
{
	struct mmc_host *mmc = amba_get_drvdata(dev);
	int ret = 0;

	if (mmc) {
		struct mmci_host *host = mmc_priv(mmc);

		writel(MCI_IRQENABLE, host->base + MMCIMASK0);

		ret = mmc_resume_host(mmc);
	}

	return ret;
}
#else
#define mmci_suspend	NULL
#define mmci_resume	NULL
#endif

static struct amba_id mmci_ids[] = {
	{
		.id	= 0x00041180,
		.mask	= 0x000fffff,
	},
	{
		.id	= 0x00041181,
		.mask	= 0x000fffff,
	},
	/* ST Micro variants */
	{
		.id     = 0x00180180,
		.mask   = 0x00ffffff,
	},
	{
		.id     = 0x00280180,
		.mask   = 0x00ffffff,
	},
	{ 0, 0 },
};

static struct amba_driver mmci_driver = {
	.drv		= {
		.name	= DRIVER_NAME,
	},
	.probe		= mmci_probe,
	.remove		= __devexit_p(mmci_remove),
	.suspend	= mmci_suspend,
	.resume		= mmci_resume,
	.id_table	= mmci_ids,
};

static int __init mmci_init(void)
{
	return amba_driver_register(&mmci_driver);
}

static void __exit mmci_exit(void)
{
	amba_driver_unregister(&mmci_driver);
}

module_init(mmci_init);
module_exit(mmci_exit);
module_param(fmax, uint, 0444);

MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
MODULE_LICENSE("GPL");