summaryrefslogtreecommitdiff
path: root/drivers/mfd/omap-usb-host.c
blob: e11ab12fbdf27228f7d003a542a61321ba3ca30b (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
877
878
879
880
881
882
883
884
885
/**
 * omap-usb-host.c - The USBHS core driver for OMAP EHCI & OHCI
 *
 * Copyright (C) 2011-2013 Texas Instruments Incorporated - http://www.ti.com
 * Author: Keshava Munegowda <keshava_mgowda@ti.com>
 * Author: Roger Quadros <rogerq@ti.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/platform_data/usb-omap.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/err.h>

#include "omap-usb.h"

#define USBHS_DRIVER_NAME	"usbhs_omap"
#define OMAP_EHCI_DEVICE	"ehci-omap"
#define OMAP_OHCI_DEVICE	"ohci-omap3"

/* OMAP USBHOST Register addresses  */

/* UHH Register Set */
#define	OMAP_UHH_REVISION				(0x00)
#define	OMAP_UHH_SYSCONFIG				(0x10)
#define	OMAP_UHH_SYSCONFIG_MIDLEMODE			(1 << 12)
#define	OMAP_UHH_SYSCONFIG_CACTIVITY			(1 << 8)
#define	OMAP_UHH_SYSCONFIG_SIDLEMODE			(1 << 3)
#define	OMAP_UHH_SYSCONFIG_ENAWAKEUP			(1 << 2)
#define	OMAP_UHH_SYSCONFIG_SOFTRESET			(1 << 1)
#define	OMAP_UHH_SYSCONFIG_AUTOIDLE			(1 << 0)

#define	OMAP_UHH_SYSSTATUS				(0x14)
#define	OMAP_UHH_HOSTCONFIG				(0x40)
#define	OMAP_UHH_HOSTCONFIG_ULPI_BYPASS			(1 << 0)
#define	OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS		(1 << 0)
#define	OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS		(1 << 11)
#define	OMAP_UHH_HOSTCONFIG_ULPI_P3_BYPASS		(1 << 12)
#define OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN		(1 << 2)
#define OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN		(1 << 3)
#define OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN		(1 << 4)
#define OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN		(1 << 5)
#define OMAP_UHH_HOSTCONFIG_P1_CONNECT_STATUS		(1 << 8)
#define OMAP_UHH_HOSTCONFIG_P2_CONNECT_STATUS		(1 << 9)
#define OMAP_UHH_HOSTCONFIG_P3_CONNECT_STATUS		(1 << 10)
#define OMAP4_UHH_HOSTCONFIG_APP_START_CLK		(1 << 31)

/* OMAP4-specific defines */
#define OMAP4_UHH_SYSCONFIG_IDLEMODE_CLEAR		(3 << 2)
#define OMAP4_UHH_SYSCONFIG_NOIDLE			(1 << 2)
#define OMAP4_UHH_SYSCONFIG_STDBYMODE_CLEAR		(3 << 4)
#define OMAP4_UHH_SYSCONFIG_NOSTDBY			(1 << 4)
#define OMAP4_UHH_SYSCONFIG_SOFTRESET			(1 << 0)

#define OMAP4_P1_MODE_CLEAR				(3 << 16)
#define OMAP4_P1_MODE_TLL				(1 << 16)
#define OMAP4_P1_MODE_HSIC				(3 << 16)
#define OMAP4_P2_MODE_CLEAR				(3 << 18)
#define OMAP4_P2_MODE_TLL				(1 << 18)
#define OMAP4_P2_MODE_HSIC				(3 << 18)

#define	OMAP_UHH_DEBUG_CSR				(0x44)

/* Values of UHH_REVISION - Note: these are not given in the TRM */
#define OMAP_USBHS_REV1		0x00000010	/* OMAP3 */
#define OMAP_USBHS_REV2		0x50700100	/* OMAP4 */

#define is_omap_usbhs_rev1(x)	(x->usbhs_rev == OMAP_USBHS_REV1)
#define is_omap_usbhs_rev2(x)	(x->usbhs_rev == OMAP_USBHS_REV2)

#define is_ehci_phy_mode(x)	(x == OMAP_EHCI_PORT_MODE_PHY)
#define is_ehci_tll_mode(x)	(x == OMAP_EHCI_PORT_MODE_TLL)
#define is_ehci_hsic_mode(x)	(x == OMAP_EHCI_PORT_MODE_HSIC)


struct usbhs_hcd_omap {
	int				nports;
	struct clk			**utmi_clk;
	struct clk			**hsic60m_clk;
	struct clk			**hsic480m_clk;

	struct clk			*xclk60mhsp1_ck;
	struct clk			*xclk60mhsp2_ck;
	struct clk			*utmi_p1_gfclk;
	struct clk			*utmi_p2_gfclk;
	struct clk			*init_60m_fclk;
	struct clk			*ehci_logic_fck;

	void __iomem			*uhh_base;

	struct usbhs_omap_platform_data	*pdata;

	u32				usbhs_rev;
};
/*-------------------------------------------------------------------------*/

static const char usbhs_driver_name[] = USBHS_DRIVER_NAME;
static u64 usbhs_dmamask = DMA_BIT_MASK(32);

/*-------------------------------------------------------------------------*/

static inline void usbhs_write(void __iomem *base, u32 reg, u32 val)
{
	writel_relaxed(val, base + reg);
}

static inline u32 usbhs_read(void __iomem *base, u32 reg)
{
	return readl_relaxed(base + reg);
}

/*-------------------------------------------------------------------------*/

/**
 * Map 'enum usbhs_omap_port_mode' found in <linux/platform_data/usb-omap.h>
 * to the device tree binding portN-mode found in
 * 'Documentation/devicetree/bindings/mfd/omap-usb-host.txt'
 */
static const char * const port_modes[] = {
	[OMAP_USBHS_PORT_MODE_UNUSED]	= "",
	[OMAP_EHCI_PORT_MODE_PHY]	= "ehci-phy",
	[OMAP_EHCI_PORT_MODE_TLL]	= "ehci-tll",
	[OMAP_EHCI_PORT_MODE_HSIC]	= "ehci-hsic",
	[OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0]	= "ohci-phy-6pin-datse0",
	[OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM]	= "ohci-phy-6pin-dpdm",
	[OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0]	= "ohci-phy-3pin-datse0",
	[OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM]	= "ohci-phy-4pin-dpdm",
	[OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0]	= "ohci-tll-6pin-datse0",
	[OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM]	= "ohci-tll-6pin-dpdm",
	[OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0]	= "ohci-tll-3pin-datse0",
	[OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM]	= "ohci-tll-4pin-dpdm",
	[OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0]	= "ohci-tll-2pin-datse0",
	[OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM]	= "ohci-tll-2pin-dpdm",
};

static struct platform_device *omap_usbhs_alloc_child(const char *name,
			struct resource	*res, int num_resources, void *pdata,
			size_t pdata_size, struct device *dev)
{
	struct platform_device	*child;
	int			ret;

	child = platform_device_alloc(name, 0);

	if (!child) {
		dev_err(dev, "platform_device_alloc %s failed\n", name);
		goto err_end;
	}

	ret = platform_device_add_resources(child, res, num_resources);
	if (ret) {
		dev_err(dev, "platform_device_add_resources failed\n");
		goto err_alloc;
	}

	ret = platform_device_add_data(child, pdata, pdata_size);
	if (ret) {
		dev_err(dev, "platform_device_add_data failed\n");
		goto err_alloc;
	}

	child->dev.dma_mask		= &usbhs_dmamask;
	dma_set_coherent_mask(&child->dev, DMA_BIT_MASK(32));
	child->dev.parent		= dev;

	ret = platform_device_add(child);
	if (ret) {
		dev_err(dev, "platform_device_add failed\n");
		goto err_alloc;
	}

	return child;

err_alloc:
	platform_device_put(child);

err_end:
	return NULL;
}

static int omap_usbhs_alloc_children(struct platform_device *pdev)
{
	struct device				*dev = &pdev->dev;
	struct usbhs_omap_platform_data		*pdata = dev_get_platdata(dev);
	struct platform_device			*ehci;
	struct platform_device			*ohci;
	struct resource				*res;
	struct resource				resources[2];
	int					ret;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ehci");
	if (!res) {
		dev_err(dev, "EHCI get resource IORESOURCE_MEM failed\n");
		ret = -ENODEV;
		goto err_end;
	}
	resources[0] = *res;

	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ehci-irq");
	if (!res) {
		dev_err(dev, " EHCI get resource IORESOURCE_IRQ failed\n");
		ret = -ENODEV;
		goto err_end;
	}
	resources[1] = *res;

	ehci = omap_usbhs_alloc_child(OMAP_EHCI_DEVICE, resources, 2, pdata,
		sizeof(*pdata), dev);

	if (!ehci) {
		dev_err(dev, "omap_usbhs_alloc_child failed\n");
		ret = -ENOMEM;
		goto err_end;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ohci");
	if (!res) {
		dev_err(dev, "OHCI get resource IORESOURCE_MEM failed\n");
		ret = -ENODEV;
		goto err_ehci;
	}
	resources[0] = *res;

	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ohci-irq");
	if (!res) {
		dev_err(dev, "OHCI get resource IORESOURCE_IRQ failed\n");
		ret = -ENODEV;
		goto err_ehci;
	}
	resources[1] = *res;

	ohci = omap_usbhs_alloc_child(OMAP_OHCI_DEVICE, resources, 2, pdata,
		sizeof(*pdata), dev);
	if (!ohci) {
		dev_err(dev, "omap_usbhs_alloc_child failed\n");
		ret = -ENOMEM;
		goto err_ehci;
	}

	return 0;

err_ehci:
	platform_device_unregister(ehci);

err_end:
	return ret;
}

static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
{
	switch (pmode) {
	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
		return true;

	default:
		return false;
	}
}

static int usbhs_runtime_resume(struct device *dev)
{
	struct usbhs_hcd_omap		*omap = dev_get_drvdata(dev);
	struct usbhs_omap_platform_data	*pdata = omap->pdata;
	int i, r;

	dev_dbg(dev, "usbhs_runtime_resume\n");

	omap_tll_enable(pdata);

	if (!IS_ERR(omap->ehci_logic_fck))
		clk_prepare_enable(omap->ehci_logic_fck);

	for (i = 0; i < omap->nports; i++) {
		switch (pdata->port_mode[i]) {
		case OMAP_EHCI_PORT_MODE_HSIC:
			if (!IS_ERR(omap->hsic60m_clk[i])) {
				r = clk_prepare_enable(omap->hsic60m_clk[i]);
				if (r) {
					dev_err(dev,
					 "Can't enable port %d hsic60m clk:%d\n",
					 i, r);
				}
			}

			if (!IS_ERR(omap->hsic480m_clk[i])) {
				r = clk_prepare_enable(omap->hsic480m_clk[i]);
				if (r) {
					dev_err(dev,
					 "Can't enable port %d hsic480m clk:%d\n",
					 i, r);
				}
			}
		/* Fall through as HSIC mode needs utmi_clk */

		case OMAP_EHCI_PORT_MODE_TLL:
			if (!IS_ERR(omap->utmi_clk[i])) {
				r = clk_prepare_enable(omap->utmi_clk[i]);
				if (r) {
					dev_err(dev,
					 "Can't enable port %d clk : %d\n",
					 i, r);
				}
			}
			break;
		default:
			break;
		}
	}

	return 0;
}

static int usbhs_runtime_suspend(struct device *dev)
{
	struct usbhs_hcd_omap		*omap = dev_get_drvdata(dev);
	struct usbhs_omap_platform_data	*pdata = omap->pdata;
	int i;

	dev_dbg(dev, "usbhs_runtime_suspend\n");

	for (i = 0; i < omap->nports; i++) {
		switch (pdata->port_mode[i]) {
		case OMAP_EHCI_PORT_MODE_HSIC:
			if (!IS_ERR(omap->hsic60m_clk[i]))
				clk_disable_unprepare(omap->hsic60m_clk[i]);

			if (!IS_ERR(omap->hsic480m_clk[i]))
				clk_disable_unprepare(omap->hsic480m_clk[i]);
		/* Fall through as utmi_clks were used in HSIC mode */

		case OMAP_EHCI_PORT_MODE_TLL:
			if (!IS_ERR(omap->utmi_clk[i]))
				clk_disable_unprepare(omap->utmi_clk[i]);
			break;
		default:
			break;
		}
	}

	if (!IS_ERR(omap->ehci_logic_fck))
		clk_disable_unprepare(omap->ehci_logic_fck);

	omap_tll_disable(pdata);

	return 0;
}

static unsigned omap_usbhs_rev1_hostconfig(struct usbhs_hcd_omap *omap,
						unsigned reg)
{
	struct usbhs_omap_platform_data	*pdata = omap->pdata;
	int i;

	for (i = 0; i < omap->nports; i++) {
		switch (pdata->port_mode[i]) {
		case OMAP_USBHS_PORT_MODE_UNUSED:
			reg &= ~(OMAP_UHH_HOSTCONFIG_P1_CONNECT_STATUS << i);
			break;
		case OMAP_EHCI_PORT_MODE_PHY:
			if (pdata->single_ulpi_bypass)
				break;

			if (i == 0)
				reg &= ~OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS;
			else
				reg &= ~(OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS
								<< (i-1));
			break;
		default:
			if (pdata->single_ulpi_bypass)
				break;

			if (i == 0)
				reg |= OMAP_UHH_HOSTCONFIG_ULPI_P1_BYPASS;
			else
				reg |= OMAP_UHH_HOSTCONFIG_ULPI_P2_BYPASS
								<< (i-1);
			break;
		}
	}

	if (pdata->single_ulpi_bypass) {
		/* bypass ULPI only if none of the ports use PHY mode */
		reg |= OMAP_UHH_HOSTCONFIG_ULPI_BYPASS;

		for (i = 0; i < omap->nports; i++) {
			if (is_ehci_phy_mode(pdata->port_mode[i])) {
				reg &= ~OMAP_UHH_HOSTCONFIG_ULPI_BYPASS;
				break;
			}
		}
	}

	return reg;
}

static unsigned omap_usbhs_rev2_hostconfig(struct usbhs_hcd_omap *omap,
						unsigned reg)
{
	struct usbhs_omap_platform_data	*pdata = omap->pdata;
	int i;

	for (i = 0; i < omap->nports; i++) {
		/* Clear port mode fields for PHY mode */
		reg &= ~(OMAP4_P1_MODE_CLEAR << 2 * i);

		if (is_ehci_tll_mode(pdata->port_mode[i]) ||
				(is_ohci_port(pdata->port_mode[i])))
			reg |= OMAP4_P1_MODE_TLL << 2 * i;
		else if (is_ehci_hsic_mode(pdata->port_mode[i]))
			reg |= OMAP4_P1_MODE_HSIC << 2 * i;
	}

	return reg;
}

static void omap_usbhs_init(struct device *dev)
{
	struct usbhs_hcd_omap		*omap = dev_get_drvdata(dev);
	unsigned			reg;

	dev_dbg(dev, "starting TI HSUSB Controller\n");

	pm_runtime_get_sync(dev);

	reg = usbhs_read(omap->uhh_base, OMAP_UHH_HOSTCONFIG);
	/* setup ULPI bypass and burst configurations */
	reg |= (OMAP_UHH_HOSTCONFIG_INCR4_BURST_EN
			| OMAP_UHH_HOSTCONFIG_INCR8_BURST_EN
			| OMAP_UHH_HOSTCONFIG_INCR16_BURST_EN);
	reg |= OMAP4_UHH_HOSTCONFIG_APP_START_CLK;
	reg &= ~OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN;

	switch (omap->usbhs_rev) {
	case OMAP_USBHS_REV1:
		reg = omap_usbhs_rev1_hostconfig(omap, reg);
		break;

	case OMAP_USBHS_REV2:
		reg = omap_usbhs_rev2_hostconfig(omap, reg);
		break;

	default:	/* newer revisions */
		reg = omap_usbhs_rev2_hostconfig(omap, reg);
		break;
	}

	usbhs_write(omap->uhh_base, OMAP_UHH_HOSTCONFIG, reg);
	dev_dbg(dev, "UHH setup done, uhh_hostconfig=%x\n", reg);

	pm_runtime_put_sync(dev);
}

static int usbhs_omap_get_dt_pdata(struct device *dev,
					struct usbhs_omap_platform_data *pdata)
{
	int ret, i;
	struct device_node *node = dev->of_node;

	ret = of_property_read_u32(node, "num-ports", &pdata->nports);
	if (ret)
		pdata->nports = 0;

	if (pdata->nports > OMAP3_HS_USB_PORTS) {
		dev_warn(dev, "Too many num_ports <%d> in device tree. Max %d\n",
				pdata->nports, OMAP3_HS_USB_PORTS);
		return -ENODEV;
	}

	/* get port modes */
	for (i = 0; i < OMAP3_HS_USB_PORTS; i++) {
		char prop[11];
		const char *mode;

		pdata->port_mode[i] = OMAP_USBHS_PORT_MODE_UNUSED;

		snprintf(prop, sizeof(prop), "port%d-mode", i + 1);
		ret = of_property_read_string(node, prop, &mode);
		if (ret < 0)
			continue;

		/* get 'enum usbhs_omap_port_mode' from port mode string */
		ret = match_string(port_modes, ARRAY_SIZE(port_modes), mode);
		if (ret < 0) {
			dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
					i, mode);
			return -ENODEV;
		}

		dev_dbg(dev, "port%d-mode: %s -> %d\n", i, mode, ret);
		pdata->port_mode[i] = ret;
	}

	/* get flags */
	pdata->single_ulpi_bypass = of_property_read_bool(node,
						"single-ulpi-bypass");

	return 0;
}

static const struct of_device_id usbhs_child_match_table[] = {
	{ .compatible = "ti,omap-ehci", },
	{ .compatible = "ti,omap-ohci", },
	{ }
};

/**
 * usbhs_omap_probe - initialize TI-based HCDs
 *
 * Allocates basic resources for this USB host controller.
 */
static int usbhs_omap_probe(struct platform_device *pdev)
{
	struct device			*dev =  &pdev->dev;
	struct usbhs_omap_platform_data	*pdata = dev_get_platdata(dev);
	struct usbhs_hcd_omap		*omap;
	struct resource			*res;
	int				ret = 0;
	int				i;
	bool				need_logic_fck;

	if (dev->of_node) {
		/* For DT boot we populate platform data from OF node */
		pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;

		ret = usbhs_omap_get_dt_pdata(dev, pdata);
		if (ret)
			return ret;

		dev->platform_data = pdata;
	}

	if (!pdata) {
		dev_err(dev, "Missing platform data\n");
		return -ENODEV;
	}

	if (pdata->nports > OMAP3_HS_USB_PORTS) {
		dev_info(dev, "Too many num_ports <%d> in platform_data. Max %d\n",
				pdata->nports, OMAP3_HS_USB_PORTS);
		return -ENODEV;
	}

	omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
	if (!omap) {
		dev_err(dev, "Memory allocation failed\n");
		return -ENOMEM;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	omap->uhh_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(omap->uhh_base))
		return PTR_ERR(omap->uhh_base);

	omap->pdata = pdata;

	/* Initialize the TLL subsystem */
	omap_tll_init(pdata);

	pm_runtime_enable(dev);

	platform_set_drvdata(pdev, omap);
	pm_runtime_get_sync(dev);

	omap->usbhs_rev = usbhs_read(omap->uhh_base, OMAP_UHH_REVISION);

	/* we need to call runtime suspend before we update omap->nports
	 * to prevent unbalanced clk_disable()
	 */
	pm_runtime_put_sync(dev);

	/*
	 * If platform data contains nports then use that
	 * else make out number of ports from USBHS revision
	 */
	if (pdata->nports) {
		omap->nports = pdata->nports;
	} else {
		switch (omap->usbhs_rev) {
		case OMAP_USBHS_REV1:
			omap->nports = 3;
			break;
		case OMAP_USBHS_REV2:
			omap->nports = 2;
			break;
		default:
			omap->nports = OMAP3_HS_USB_PORTS;
			dev_dbg(dev,
			 "USB HOST Rev:0x%x not recognized, assuming %d ports\n",
			 omap->usbhs_rev, omap->nports);
			break;
		}
		pdata->nports = omap->nports;
	}

	i = sizeof(struct clk *) * omap->nports;
	omap->utmi_clk = devm_kzalloc(dev, i, GFP_KERNEL);
	omap->hsic480m_clk = devm_kzalloc(dev, i, GFP_KERNEL);
	omap->hsic60m_clk = devm_kzalloc(dev, i, GFP_KERNEL);

	if (!omap->utmi_clk || !omap->hsic480m_clk || !omap->hsic60m_clk) {
		dev_err(dev, "Memory allocation failed\n");
		ret = -ENOMEM;
		goto err_mem;
	}

	/* Set all clocks as invalid to begin with */
	omap->ehci_logic_fck = ERR_PTR(-ENODEV);
	omap->init_60m_fclk = ERR_PTR(-ENODEV);
	omap->utmi_p1_gfclk = ERR_PTR(-ENODEV);
	omap->utmi_p2_gfclk = ERR_PTR(-ENODEV);
	omap->xclk60mhsp1_ck = ERR_PTR(-ENODEV);
	omap->xclk60mhsp2_ck = ERR_PTR(-ENODEV);

	for (i = 0; i < omap->nports; i++) {
		omap->utmi_clk[i] = ERR_PTR(-ENODEV);
		omap->hsic480m_clk[i] = ERR_PTR(-ENODEV);
		omap->hsic60m_clk[i] = ERR_PTR(-ENODEV);
	}

	/* for OMAP3 i.e. USBHS REV1 */
	if (omap->usbhs_rev == OMAP_USBHS_REV1) {
		need_logic_fck = false;
		for (i = 0; i < omap->nports; i++) {
			if (is_ehci_phy_mode(pdata->port_mode[i]) ||
			    is_ehci_tll_mode(pdata->port_mode[i]) ||
			    is_ehci_hsic_mode(pdata->port_mode[i]))

				need_logic_fck |= true;
		}

		if (need_logic_fck) {
			omap->ehci_logic_fck = devm_clk_get(dev,
							    "usbhost_120m_fck");
			if (IS_ERR(omap->ehci_logic_fck)) {
				ret = PTR_ERR(omap->ehci_logic_fck);
				dev_err(dev, "usbhost_120m_fck failed:%d\n",
					ret);
				goto err_mem;
			}
		}
		goto initialize;
	}

	/* for OMAP4+ i.e. USBHS REV2+ */
	omap->utmi_p1_gfclk = devm_clk_get(dev, "utmi_p1_gfclk");
	if (IS_ERR(omap->utmi_p1_gfclk)) {
		ret = PTR_ERR(omap->utmi_p1_gfclk);
		dev_err(dev, "utmi_p1_gfclk failed error:%d\n", ret);
		goto err_mem;
	}

	omap->utmi_p2_gfclk = devm_clk_get(dev, "utmi_p2_gfclk");
	if (IS_ERR(omap->utmi_p2_gfclk)) {
		ret = PTR_ERR(omap->utmi_p2_gfclk);
		dev_err(dev, "utmi_p2_gfclk failed error:%d\n", ret);
		goto err_mem;
	}

	omap->xclk60mhsp1_ck = devm_clk_get(dev, "refclk_60m_ext_p1");
	if (IS_ERR(omap->xclk60mhsp1_ck)) {
		ret = PTR_ERR(omap->xclk60mhsp1_ck);
		dev_err(dev, "refclk_60m_ext_p1 failed error:%d\n", ret);
		goto err_mem;
	}

	omap->xclk60mhsp2_ck = devm_clk_get(dev, "refclk_60m_ext_p2");
	if (IS_ERR(omap->xclk60mhsp2_ck)) {
		ret = PTR_ERR(omap->xclk60mhsp2_ck);
		dev_err(dev, "refclk_60m_ext_p2 failed error:%d\n", ret);
		goto err_mem;
	}

	omap->init_60m_fclk = devm_clk_get(dev, "refclk_60m_int");
	if (IS_ERR(omap->init_60m_fclk)) {
		ret = PTR_ERR(omap->init_60m_fclk);
		dev_err(dev, "refclk_60m_int failed error:%d\n", ret);
		goto err_mem;
	}

	for (i = 0; i < omap->nports; i++) {
		char clkname[30];

		/* clock names are indexed from 1*/
		snprintf(clkname, sizeof(clkname),
				"usb_host_hs_utmi_p%d_clk", i + 1);

		/* If a clock is not found we won't bail out as not all
		 * platforms have all clocks and we can function without
		 * them
		 */
		omap->utmi_clk[i] = devm_clk_get(dev, clkname);
		if (IS_ERR(omap->utmi_clk[i])) {
			ret = PTR_ERR(omap->utmi_clk[i]);
			dev_err(dev, "Failed to get clock : %s : %d\n",
				clkname, ret);
			goto err_mem;
		}

		snprintf(clkname, sizeof(clkname),
				"usb_host_hs_hsic480m_p%d_clk", i + 1);
		omap->hsic480m_clk[i] = devm_clk_get(dev, clkname);
		if (IS_ERR(omap->hsic480m_clk[i])) {
			ret = PTR_ERR(omap->hsic480m_clk[i]);
			dev_err(dev, "Failed to get clock : %s : %d\n",
				clkname, ret);
			goto err_mem;
		}

		snprintf(clkname, sizeof(clkname),
				"usb_host_hs_hsic60m_p%d_clk", i + 1);
		omap->hsic60m_clk[i] = devm_clk_get(dev, clkname);
		if (IS_ERR(omap->hsic60m_clk[i])) {
			ret = PTR_ERR(omap->hsic60m_clk[i]);
			dev_err(dev, "Failed to get clock : %s : %d\n",
				clkname, ret);
			goto err_mem;
		}
	}

	if (is_ehci_phy_mode(pdata->port_mode[0])) {
		ret = clk_set_parent(omap->utmi_p1_gfclk,
					omap->xclk60mhsp1_ck);
		if (ret != 0) {
			dev_err(dev, "xclk60mhsp1_ck set parent failed: %d\n",
				ret);
			goto err_mem;
		}
	} else if (is_ehci_tll_mode(pdata->port_mode[0])) {
		ret = clk_set_parent(omap->utmi_p1_gfclk,
					omap->init_60m_fclk);
		if (ret != 0) {
			dev_err(dev, "P0 init_60m_fclk set parent failed: %d\n",
				ret);
			goto err_mem;
		}
	}

	if (is_ehci_phy_mode(pdata->port_mode[1])) {
		ret = clk_set_parent(omap->utmi_p2_gfclk,
					omap->xclk60mhsp2_ck);
		if (ret != 0) {
			dev_err(dev, "xclk60mhsp2_ck set parent failed: %d\n",
				ret);
			goto err_mem;
		}
	} else if (is_ehci_tll_mode(pdata->port_mode[1])) {
		ret = clk_set_parent(omap->utmi_p2_gfclk,
						omap->init_60m_fclk);
		if (ret != 0) {
			dev_err(dev, "P1 init_60m_fclk set parent failed: %d\n",
				ret);
			goto err_mem;
		}
	}

initialize:
	omap_usbhs_init(dev);

	if (dev->of_node) {
		ret = of_platform_populate(dev->of_node,
				usbhs_child_match_table, NULL, dev);

		if (ret) {
			dev_err(dev, "Failed to create DT children: %d\n", ret);
			goto err_mem;
		}

	} else {
		ret = omap_usbhs_alloc_children(pdev);
		if (ret) {
			dev_err(dev, "omap_usbhs_alloc_children failed: %d\n",
						ret);
			goto err_mem;
		}
	}

	return 0;

err_mem:
	pm_runtime_disable(dev);

	return ret;
}

static int usbhs_omap_remove_child(struct device *dev, void *data)
{
	dev_info(dev, "unregistering\n");
	platform_device_unregister(to_platform_device(dev));
	return 0;
}

/**
 * usbhs_omap_remove - shutdown processing for UHH & TLL HCDs
 * @pdev: USB Host Controller being removed
 *
 * Reverses the effect of usbhs_omap_probe().
 */
static int usbhs_omap_remove(struct platform_device *pdev)
{
	pm_runtime_disable(&pdev->dev);

	/* remove children */
	device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);
	return 0;
}

static const struct dev_pm_ops usbhsomap_dev_pm_ops = {
	.runtime_suspend	= usbhs_runtime_suspend,
	.runtime_resume		= usbhs_runtime_resume,
};

static const struct of_device_id usbhs_omap_dt_ids[] = {
	{ .compatible = "ti,usbhs-host" },
	{ }
};

MODULE_DEVICE_TABLE(of, usbhs_omap_dt_ids);


static struct platform_driver usbhs_omap_driver = {
	.driver = {
		.name		= (char *)usbhs_driver_name,
		.pm		= &usbhsomap_dev_pm_ops,
		.of_match_table = usbhs_omap_dt_ids,
	},
	.remove		= usbhs_omap_remove,
};

MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("usb host common core driver for omap EHCI and OHCI");

static int __init omap_usbhs_drvinit(void)
{
	return platform_driver_probe(&usbhs_omap_driver, usbhs_omap_probe);
}

/*
 * init before ehci and ohci drivers;
 * The usbhs core driver should be initialized much before
 * the omap ehci and ohci probe functions are called.
 * This usbhs core driver should be initialized after
 * usb tll driver
 */
fs_initcall_sync(omap_usbhs_drvinit);

static void __exit omap_usbhs_drvexit(void)
{
	platform_driver_unregister(&usbhs_omap_driver);
}
module_exit(omap_usbhs_drvexit);