summaryrefslogtreecommitdiff
path: root/drivers/pci/controller/dwc/pci-dra7xx.c
blob: a4221f6f362912c71822ac02fffd281eb3124374 (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
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
// SPDX-License-Identifier: GPL-2.0
/*
 * pcie-dra7xx - PCIe controller driver for TI DRA7xx SoCs
 *
 * Copyright (C) 2013-2014 Texas Instruments Incorporated - https://www.ti.com
 *
 * Authors: Kishon Vijay Abraham I <kishon@ti.com>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/resource.h>
#include <linux/types.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>

#include "../../pci.h"
#include "pcie-designware.h"

/* PCIe controller wrapper DRA7XX configuration registers */

#define	PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN		0x0024
#define	PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN		0x0028
#define	ERR_SYS						BIT(0)
#define	ERR_FATAL					BIT(1)
#define	ERR_NONFATAL					BIT(2)
#define	ERR_COR						BIT(3)
#define	ERR_AXI						BIT(4)
#define	ERR_ECRC					BIT(5)
#define	PME_TURN_OFF					BIT(8)
#define	PME_TO_ACK					BIT(9)
#define	PM_PME						BIT(10)
#define	LINK_REQ_RST					BIT(11)
#define	LINK_UP_EVT					BIT(12)
#define	CFG_BME_EVT					BIT(13)
#define	CFG_MSE_EVT					BIT(14)
#define	INTERRUPTS (ERR_SYS | ERR_FATAL | ERR_NONFATAL | ERR_COR | ERR_AXI | \
			ERR_ECRC | PME_TURN_OFF | PME_TO_ACK | PM_PME | \
			LINK_REQ_RST | LINK_UP_EVT | CFG_BME_EVT | CFG_MSE_EVT)

#define	PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI		0x0034
#define	PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI		0x0038
#define	INTA						BIT(0)
#define	INTB						BIT(1)
#define	INTC						BIT(2)
#define	INTD						BIT(3)
#define	MSI						BIT(4)
#define	LEG_EP_INTERRUPTS (INTA | INTB | INTC | INTD)

#define	PCIECTRL_TI_CONF_DEVICE_TYPE			0x0100
#define	DEVICE_TYPE_EP					0x0
#define	DEVICE_TYPE_LEG_EP				0x1
#define	DEVICE_TYPE_RC					0x4

#define	PCIECTRL_DRA7XX_CONF_DEVICE_CMD			0x0104
#define	LTSSM_EN					0x1

#define	PCIECTRL_DRA7XX_CONF_PHY_CS			0x010C
#define	LINK_UP						BIT(16)
#define	DRA7XX_CPU_TO_BUS_ADDR				0x0FFFFFFF

#define	PCIECTRL_TI_CONF_INTX_ASSERT			0x0124
#define	PCIECTRL_TI_CONF_INTX_DEASSERT			0x0128

#define	PCIECTRL_TI_CONF_MSI_XMT			0x012c
#define MSI_REQ_GRANT					BIT(0)
#define MSI_VECTOR_SHIFT				7

#define PCIE_1LANE_2LANE_SELECTION			BIT(13)
#define PCIE_B1C0_MODE_SEL				BIT(2)
#define PCIE_B0_B1_TSYNCEN				BIT(0)

struct dra7xx_pcie {
	struct dw_pcie		*pci;
	void __iomem		*base;		/* DT ti_conf */
	int			phy_count;	/* DT phy-names count */
	struct phy		**phy;
	struct irq_domain	*irq_domain;
	struct clk              *clk;
	enum dw_pcie_device_mode mode;
};

struct dra7xx_pcie_of_data {
	enum dw_pcie_device_mode mode;
	u32 b1co_mode_sel_mask;
};

#define to_dra7xx_pcie(x)	dev_get_drvdata((x)->dev)

static inline u32 dra7xx_pcie_readl(struct dra7xx_pcie *pcie, u32 offset)
{
	return readl(pcie->base + offset);
}

static inline void dra7xx_pcie_writel(struct dra7xx_pcie *pcie, u32 offset,
				      u32 value)
{
	writel(value, pcie->base + offset);
}

static u64 dra7xx_pcie_cpu_addr_fixup(struct dw_pcie *pci, u64 pci_addr)
{
	return pci_addr & DRA7XX_CPU_TO_BUS_ADDR;
}

static int dra7xx_pcie_link_up(struct dw_pcie *pci)
{
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
	u32 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);

	return !!(reg & LINK_UP);
}

static void dra7xx_pcie_stop_link(struct dw_pcie *pci)
{
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
	u32 reg;

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
	reg &= ~LTSSM_EN;
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
}

static int dra7xx_pcie_establish_link(struct dw_pcie *pci)
{
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
	struct device *dev = pci->dev;
	u32 reg;

	if (dw_pcie_link_up(pci)) {
		dev_err(dev, "link is already up\n");
		return 0;
	}

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
	reg |= LTSSM_EN;
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);

	return 0;
}

static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
{
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
			   LEG_EP_INTERRUPTS | MSI);

	dra7xx_pcie_writel(dra7xx,
			   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
			   MSI | LEG_EP_INTERRUPTS);
}

static void dra7xx_pcie_enable_wrapper_interrupts(struct dra7xx_pcie *dra7xx)
{
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
			   INTERRUPTS);
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN,
			   INTERRUPTS);
}

static void dra7xx_pcie_enable_interrupts(struct dra7xx_pcie *dra7xx)
{
	dra7xx_pcie_enable_wrapper_interrupts(dra7xx);
	dra7xx_pcie_enable_msi_interrupts(dra7xx);
}

static int dra7xx_pcie_host_init(struct pcie_port *pp)
{
	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);

	dra7xx_pcie_enable_interrupts(dra7xx);

	return 0;
}

static int dra7xx_pcie_intx_map(struct irq_domain *domain, unsigned int irq,
				irq_hw_number_t hwirq)
{
	irq_set_chip_and_handler(irq, &dummy_irq_chip, handle_simple_irq);
	irq_set_chip_data(irq, domain->host_data);

	return 0;
}

static const struct irq_domain_ops intx_domain_ops = {
	.map = dra7xx_pcie_intx_map,
	.xlate = pci_irqd_intx_xlate,
};

static int dra7xx_pcie_handle_msi(struct pcie_port *pp, int index)
{
	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
	unsigned long val;
	int pos;

	val = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
				   (index * MSI_REG_CTRL_BLOCK_SIZE));
	if (!val)
		return 0;

	pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL, 0);
	while (pos != MAX_MSI_IRQS_PER_CTRL) {
		generic_handle_domain_irq(pp->irq_domain,
					  (index * MAX_MSI_IRQS_PER_CTRL) + pos);
		pos++;
		pos = find_next_bit(&val, MAX_MSI_IRQS_PER_CTRL, pos);
	}

	return 1;
}

static void dra7xx_pcie_handle_msi_irq(struct pcie_port *pp)
{
	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
	int ret, i, count, num_ctrls;

	num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;

	/**
	 * Need to make sure all MSI status bits read 0 before exiting.
	 * Else, new MSI IRQs are not registered by the wrapper. Have an
	 * upperbound for the loop and exit the IRQ in case of IRQ flood
	 * to avoid locking up system in interrupt context.
	 */
	count = 0;
	do {
		ret = 0;

		for (i = 0; i < num_ctrls; i++)
			ret |= dra7xx_pcie_handle_msi(pp, i);
		count++;
	} while (ret && count <= 1000);

	if (count > 1000)
		dev_warn_ratelimited(pci->dev,
				     "Too many MSI IRQs to handle\n");
}

static void dra7xx_pcie_msi_irq_handler(struct irq_desc *desc)
{
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct dra7xx_pcie *dra7xx;
	struct dw_pcie *pci;
	struct pcie_port *pp;
	unsigned long reg;
	u32 bit;

	chained_irq_enter(chip, desc);

	pp = irq_desc_get_handler_data(desc);
	pci = to_dw_pcie_from_pp(pp);
	dra7xx = to_dra7xx_pcie(pci);

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI);
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI, reg);

	switch (reg) {
	case MSI:
		dra7xx_pcie_handle_msi_irq(pp);
		break;
	case INTA:
	case INTB:
	case INTC:
	case INTD:
		for_each_set_bit(bit, &reg, PCI_NUM_INTX)
			generic_handle_domain_irq(dra7xx->irq_domain, bit);
		break;
	}

	chained_irq_exit(chip, desc);
}

static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg)
{
	struct dra7xx_pcie *dra7xx = arg;
	struct dw_pcie *pci = dra7xx->pci;
	struct device *dev = pci->dev;
	struct dw_pcie_ep *ep = &pci->ep;
	u32 reg;

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN);

	if (reg & ERR_SYS)
		dev_dbg(dev, "System Error\n");

	if (reg & ERR_FATAL)
		dev_dbg(dev, "Fatal Error\n");

	if (reg & ERR_NONFATAL)
		dev_dbg(dev, "Non Fatal Error\n");

	if (reg & ERR_COR)
		dev_dbg(dev, "Correctable Error\n");

	if (reg & ERR_AXI)
		dev_dbg(dev, "AXI tag lookup fatal Error\n");

	if (reg & ERR_ECRC)
		dev_dbg(dev, "ECRC Error\n");

	if (reg & PME_TURN_OFF)
		dev_dbg(dev,
			"Power Management Event Turn-Off message received\n");

	if (reg & PME_TO_ACK)
		dev_dbg(dev,
			"Power Management Turn-Off Ack message received\n");

	if (reg & PM_PME)
		dev_dbg(dev, "PM Power Management Event message received\n");

	if (reg & LINK_REQ_RST)
		dev_dbg(dev, "Link Request Reset\n");

	if (reg & LINK_UP_EVT) {
		if (dra7xx->mode == DW_PCIE_EP_TYPE)
			dw_pcie_ep_linkup(ep);
		dev_dbg(dev, "Link-up state change\n");
	}

	if (reg & CFG_BME_EVT)
		dev_dbg(dev, "CFG 'Bus Master Enable' change\n");

	if (reg & CFG_MSE_EVT)
		dev_dbg(dev, "CFG 'Memory Space Enable' change\n");

	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN, reg);

	return IRQ_HANDLED;
}

static int dra7xx_pcie_init_irq_domain(struct pcie_port *pp)
{
	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
	struct device *dev = pci->dev;
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
	struct device_node *node = dev->of_node;
	struct device_node *pcie_intc_node =  of_get_next_child(node, NULL);

	if (!pcie_intc_node) {
		dev_err(dev, "No PCIe Intc node found\n");
		return -ENODEV;
	}

	irq_set_chained_handler_and_data(pp->irq, dra7xx_pcie_msi_irq_handler,
					 pp);
	dra7xx->irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX,
						   &intx_domain_ops, pp);
	of_node_put(pcie_intc_node);
	if (!dra7xx->irq_domain) {
		dev_err(dev, "Failed to get a INTx IRQ domain\n");
		return -ENODEV;
	}

	return 0;
}

static const struct dw_pcie_host_ops dra7xx_pcie_host_ops = {
	.host_init = dra7xx_pcie_host_init,
};

static void dra7xx_pcie_ep_init(struct dw_pcie_ep *ep)
{
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
	enum pci_barno bar;

	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
		dw_pcie_ep_reset_bar(pci, bar);

	dra7xx_pcie_enable_wrapper_interrupts(dra7xx);
}

static void dra7xx_pcie_raise_legacy_irq(struct dra7xx_pcie *dra7xx)
{
	dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_ASSERT, 0x1);
	mdelay(1);
	dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_DEASSERT, 0x1);
}

static void dra7xx_pcie_raise_msi_irq(struct dra7xx_pcie *dra7xx,
				      u8 interrupt_num)
{
	u32 reg;

	reg = (interrupt_num - 1) << MSI_VECTOR_SHIFT;
	reg |= MSI_REQ_GRANT;
	dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_MSI_XMT, reg);
}

static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
				 enum pci_epc_irq_type type, u16 interrupt_num)
{
	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);

	switch (type) {
	case PCI_EPC_IRQ_LEGACY:
		dra7xx_pcie_raise_legacy_irq(dra7xx);
		break;
	case PCI_EPC_IRQ_MSI:
		dra7xx_pcie_raise_msi_irq(dra7xx, interrupt_num);
		break;
	default:
		dev_err(pci->dev, "UNKNOWN IRQ type\n");
	}

	return 0;
}

static const struct pci_epc_features dra7xx_pcie_epc_features = {
	.linkup_notifier = true,
	.msi_capable = true,
	.msix_capable = false,
};

static const struct pci_epc_features*
dra7xx_pcie_get_features(struct dw_pcie_ep *ep)
{
	return &dra7xx_pcie_epc_features;
}

static const struct dw_pcie_ep_ops pcie_ep_ops = {
	.ep_init = dra7xx_pcie_ep_init,
	.raise_irq = dra7xx_pcie_raise_irq,
	.get_features = dra7xx_pcie_get_features,
};

static int dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
			      struct platform_device *pdev)
{
	int ret;
	struct dw_pcie_ep *ep;
	struct device *dev = &pdev->dev;
	struct dw_pcie *pci = dra7xx->pci;

	ep = &pci->ep;
	ep->ops = &pcie_ep_ops;

	pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "ep_dbics");
	if (IS_ERR(pci->dbi_base))
		return PTR_ERR(pci->dbi_base);

	pci->dbi_base2 =
		devm_platform_ioremap_resource_byname(pdev, "ep_dbics2");
	if (IS_ERR(pci->dbi_base2))
		return PTR_ERR(pci->dbi_base2);

	ret = dw_pcie_ep_init(ep);
	if (ret) {
		dev_err(dev, "failed to initialize endpoint\n");
		return ret;
	}

	return 0;
}

static int dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
				struct platform_device *pdev)
{
	int ret;
	struct dw_pcie *pci = dra7xx->pci;
	struct pcie_port *pp = &pci->pp;
	struct device *dev = pci->dev;

	pp->irq = platform_get_irq(pdev, 1);
	if (pp->irq < 0)
		return pp->irq;

	/* MSI IRQ is muxed */
	pp->msi_irq = -ENODEV;

	ret = dra7xx_pcie_init_irq_domain(pp);
	if (ret < 0)
		return ret;

	pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "rc_dbics");
	if (IS_ERR(pci->dbi_base))
		return PTR_ERR(pci->dbi_base);

	pp->ops = &dra7xx_pcie_host_ops;

	ret = dw_pcie_host_init(pp);
	if (ret) {
		dev_err(dev, "failed to initialize host\n");
		return ret;
	}

	return 0;
}

static const struct dw_pcie_ops dw_pcie_ops = {
	.cpu_addr_fixup = dra7xx_pcie_cpu_addr_fixup,
	.start_link = dra7xx_pcie_establish_link,
	.stop_link = dra7xx_pcie_stop_link,
	.link_up = dra7xx_pcie_link_up,
};

static void dra7xx_pcie_disable_phy(struct dra7xx_pcie *dra7xx)
{
	int phy_count = dra7xx->phy_count;

	while (phy_count--) {
		phy_power_off(dra7xx->phy[phy_count]);
		phy_exit(dra7xx->phy[phy_count]);
	}
}

static int dra7xx_pcie_enable_phy(struct dra7xx_pcie *dra7xx)
{
	int phy_count = dra7xx->phy_count;
	int ret;
	int i;

	for (i = 0; i < phy_count; i++) {
		ret = phy_set_mode(dra7xx->phy[i], PHY_MODE_PCIE);
		if (ret < 0)
			goto err_phy;

		ret = phy_init(dra7xx->phy[i]);
		if (ret < 0)
			goto err_phy;

		ret = phy_power_on(dra7xx->phy[i]);
		if (ret < 0) {
			phy_exit(dra7xx->phy[i]);
			goto err_phy;
		}
	}

	return 0;

err_phy:
	while (--i >= 0) {
		phy_power_off(dra7xx->phy[i]);
		phy_exit(dra7xx->phy[i]);
	}

	return ret;
}

static const struct dra7xx_pcie_of_data dra7xx_pcie_rc_of_data = {
	.mode = DW_PCIE_RC_TYPE,
};

static const struct dra7xx_pcie_of_data dra7xx_pcie_ep_of_data = {
	.mode = DW_PCIE_EP_TYPE,
};

static const struct dra7xx_pcie_of_data dra746_pcie_rc_of_data = {
	.b1co_mode_sel_mask = BIT(2),
	.mode = DW_PCIE_RC_TYPE,
};

static const struct dra7xx_pcie_of_data dra726_pcie_rc_of_data = {
	.b1co_mode_sel_mask = GENMASK(3, 2),
	.mode = DW_PCIE_RC_TYPE,
};

static const struct dra7xx_pcie_of_data dra746_pcie_ep_of_data = {
	.b1co_mode_sel_mask = BIT(2),
	.mode = DW_PCIE_EP_TYPE,
};

static const struct dra7xx_pcie_of_data dra726_pcie_ep_of_data = {
	.b1co_mode_sel_mask = GENMASK(3, 2),
	.mode = DW_PCIE_EP_TYPE,
};

static const struct of_device_id of_dra7xx_pcie_match[] = {
	{
		.compatible = "ti,dra7-pcie",
		.data = &dra7xx_pcie_rc_of_data,
	},
	{
		.compatible = "ti,dra7-pcie-ep",
		.data = &dra7xx_pcie_ep_of_data,
	},
	{
		.compatible = "ti,dra746-pcie-rc",
		.data = &dra746_pcie_rc_of_data,
	},
	{
		.compatible = "ti,dra726-pcie-rc",
		.data = &dra726_pcie_rc_of_data,
	},
	{
		.compatible = "ti,dra746-pcie-ep",
		.data = &dra746_pcie_ep_of_data,
	},
	{
		.compatible = "ti,dra726-pcie-ep",
		.data = &dra726_pcie_ep_of_data,
	},
	{},
};
MODULE_DEVICE_TABLE(of, of_dra7xx_pcie_match);

/*
 * dra7xx_pcie_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
 * @dra7xx: the dra7xx device where the workaround should be applied
 *
 * Access to the PCIe slave port that are not 32-bit aligned will result
 * in incorrect mapping to TLP Address and Byte enable fields. Therefore,
 * byte and half-word accesses are not possible to byte offset 0x1, 0x2, or
 * 0x3.
 *
 * To avoid this issue set PCIE_SS1_AXI2OCP_LEGACY_MODE_ENABLE to 1.
 */
static int dra7xx_pcie_unaligned_memaccess(struct device *dev)
{
	int ret;
	struct device_node *np = dev->of_node;
	struct of_phandle_args args;
	struct regmap *regmap;

	regmap = syscon_regmap_lookup_by_phandle(np,
						 "ti,syscon-unaligned-access");
	if (IS_ERR(regmap)) {
		dev_dbg(dev, "can't get ti,syscon-unaligned-access\n");
		return -EINVAL;
	}

	ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-unaligned-access",
					       2, 0, &args);
	if (ret) {
		dev_err(dev, "failed to parse ti,syscon-unaligned-access\n");
		return ret;
	}

	ret = regmap_update_bits(regmap, args.args[0], args.args[1],
				 args.args[1]);
	if (ret)
		dev_err(dev, "failed to enable unaligned access\n");

	of_node_put(args.np);

	return ret;
}

static int dra7xx_pcie_configure_two_lane(struct device *dev,
					  u32 b1co_mode_sel_mask)
{
	struct device_node *np = dev->of_node;
	struct regmap *pcie_syscon;
	unsigned int pcie_reg;
	u32 mask;
	u32 val;

	pcie_syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-lane-sel");
	if (IS_ERR(pcie_syscon)) {
		dev_err(dev, "unable to get ti,syscon-lane-sel\n");
		return -EINVAL;
	}

	if (of_property_read_u32_index(np, "ti,syscon-lane-sel", 1,
				       &pcie_reg)) {
		dev_err(dev, "couldn't get lane selection reg offset\n");
		return -EINVAL;
	}

	mask = b1co_mode_sel_mask | PCIE_B0_B1_TSYNCEN;
	val = PCIE_B1C0_MODE_SEL | PCIE_B0_B1_TSYNCEN;
	regmap_update_bits(pcie_syscon, pcie_reg, mask, val);

	return 0;
}

static int dra7xx_pcie_probe(struct platform_device *pdev)
{
	u32 reg;
	int ret;
	int irq;
	int i;
	int phy_count;
	struct phy **phy;
	struct device_link **link;
	void __iomem *base;
	struct dw_pcie *pci;
	struct dra7xx_pcie *dra7xx;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	char name[10];
	struct gpio_desc *reset;
	const struct of_device_id *match;
	const struct dra7xx_pcie_of_data *data;
	enum dw_pcie_device_mode mode;
	u32 b1co_mode_sel_mask;

	match = of_match_device(of_match_ptr(of_dra7xx_pcie_match), dev);
	if (!match)
		return -EINVAL;

	data = (struct dra7xx_pcie_of_data *)match->data;
	mode = (enum dw_pcie_device_mode)data->mode;
	b1co_mode_sel_mask = data->b1co_mode_sel_mask;

	dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL);
	if (!dra7xx)
		return -ENOMEM;

	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
	if (!pci)
		return -ENOMEM;

	pci->dev = dev;
	pci->ops = &dw_pcie_ops;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	base = devm_platform_ioremap_resource_byname(pdev, "ti_conf");
	if (IS_ERR(base))
		return PTR_ERR(base);

	phy_count = of_property_count_strings(np, "phy-names");
	if (phy_count < 0) {
		dev_err(dev, "unable to find the strings\n");
		return phy_count;
	}

	phy = devm_kcalloc(dev, phy_count, sizeof(*phy), GFP_KERNEL);
	if (!phy)
		return -ENOMEM;

	link = devm_kcalloc(dev, phy_count, sizeof(*link), GFP_KERNEL);
	if (!link)
		return -ENOMEM;

	dra7xx->clk = devm_clk_get_optional(dev, NULL);
	if (IS_ERR(dra7xx->clk))
		return dev_err_probe(dev, PTR_ERR(dra7xx->clk),
				     "clock request failed");

	ret = clk_prepare_enable(dra7xx->clk);
	if (ret)
		return ret;

	for (i = 0; i < phy_count; i++) {
		snprintf(name, sizeof(name), "pcie-phy%d", i);
		phy[i] = devm_phy_get(dev, name);
		if (IS_ERR(phy[i]))
			return PTR_ERR(phy[i]);

		link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
		if (!link[i]) {
			ret = -EINVAL;
			goto err_link;
		}
	}

	dra7xx->base = base;
	dra7xx->phy = phy;
	dra7xx->pci = pci;
	dra7xx->phy_count = phy_count;

	if (phy_count == 2) {
		ret = dra7xx_pcie_configure_two_lane(dev, b1co_mode_sel_mask);
		if (ret < 0)
			dra7xx->phy_count = 1; /* Fallback to x1 lane mode */
	}

	ret = dra7xx_pcie_enable_phy(dra7xx);
	if (ret) {
		dev_err(dev, "failed to enable phy\n");
		return ret;
	}

	platform_set_drvdata(pdev, dra7xx);

	pm_runtime_enable(dev);
	ret = pm_runtime_get_sync(dev);
	if (ret < 0) {
		dev_err(dev, "pm_runtime_get_sync failed\n");
		goto err_get_sync;
	}

	reset = devm_gpiod_get_optional(dev, NULL, GPIOD_OUT_HIGH);
	if (IS_ERR(reset)) {
		ret = PTR_ERR(reset);
		dev_err(&pdev->dev, "gpio request failed, ret %d\n", ret);
		goto err_gpio;
	}

	reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
	reg &= ~LTSSM_EN;
	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);

	switch (mode) {
	case DW_PCIE_RC_TYPE:
		if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) {
			ret = -ENODEV;
			goto err_gpio;
		}

		dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
				   DEVICE_TYPE_RC);

		ret = dra7xx_pcie_unaligned_memaccess(dev);
		if (ret)
			dev_err(dev, "WA for Errata i870 not applied\n");

		ret = dra7xx_add_pcie_port(dra7xx, pdev);
		if (ret < 0)
			goto err_gpio;
		break;
	case DW_PCIE_EP_TYPE:
		if (!IS_ENABLED(CONFIG_PCI_DRA7XX_EP)) {
			ret = -ENODEV;
			goto err_gpio;
		}

		dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
				   DEVICE_TYPE_EP);

		ret = dra7xx_pcie_unaligned_memaccess(dev);
		if (ret)
			goto err_gpio;

		ret = dra7xx_add_pcie_ep(dra7xx, pdev);
		if (ret < 0)
			goto err_gpio;
		break;
	default:
		dev_err(dev, "INVALID device type %d\n", mode);
	}
	dra7xx->mode = mode;

	ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler,
			       IRQF_SHARED, "dra7xx-pcie-main", dra7xx);
	if (ret) {
		dev_err(dev, "failed to request irq\n");
		goto err_gpio;
	}

	return 0;

err_gpio:
err_get_sync:
	pm_runtime_put(dev);
	pm_runtime_disable(dev);
	dra7xx_pcie_disable_phy(dra7xx);

err_link:
	while (--i >= 0)
		device_link_del(link[i]);

	return ret;
}

#ifdef CONFIG_PM_SLEEP
static int dra7xx_pcie_suspend(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	struct dw_pcie *pci = dra7xx->pci;
	u32 val;

	if (dra7xx->mode != DW_PCIE_RC_TYPE)
		return 0;

	/* clear MSE */
	val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
	val &= ~PCI_COMMAND_MEMORY;
	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);

	return 0;
}

static int dra7xx_pcie_resume(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	struct dw_pcie *pci = dra7xx->pci;
	u32 val;

	if (dra7xx->mode != DW_PCIE_RC_TYPE)
		return 0;

	/* set MSE */
	val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
	val |= PCI_COMMAND_MEMORY;
	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);

	return 0;
}

static int dra7xx_pcie_suspend_noirq(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);

	dra7xx_pcie_disable_phy(dra7xx);

	return 0;
}

static int dra7xx_pcie_resume_noirq(struct device *dev)
{
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	int ret;

	ret = dra7xx_pcie_enable_phy(dra7xx);
	if (ret) {
		dev_err(dev, "failed to enable phy\n");
		return ret;
	}

	return 0;
}
#endif

static void dra7xx_pcie_shutdown(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
	int ret;

	dra7xx_pcie_stop_link(dra7xx->pci);

	ret = pm_runtime_put_sync(dev);
	if (ret < 0)
		dev_dbg(dev, "pm_runtime_put_sync failed\n");

	pm_runtime_disable(dev);
	dra7xx_pcie_disable_phy(dra7xx);

	clk_disable_unprepare(dra7xx->clk);
}

static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
				      dra7xx_pcie_resume_noirq)
};

static struct platform_driver dra7xx_pcie_driver = {
	.probe = dra7xx_pcie_probe,
	.driver = {
		.name	= "dra7-pcie",
		.of_match_table = of_dra7xx_pcie_match,
		.suppress_bind_attrs = true,
		.pm	= &dra7xx_pcie_pm_ops,
	},
	.shutdown = dra7xx_pcie_shutdown,
};
module_platform_driver(dra7xx_pcie_driver);

MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
MODULE_DESCRIPTION("PCIe controller driver for TI DRA7xx SoCs");
MODULE_LICENSE("GPL v2");