summaryrefslogtreecommitdiffstats
path: root/drivers/pci/host/pcie-rcar.c
blob: f4fa6c537448cae9d25519a8697e212aa70facaa (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
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
/*
 * PCIe driver for Renesas R-Car SoCs
 *  Copyright (C) 2014 Renesas Electronics Europe Ltd
 *
 * Based on:
 *  arch/sh/drivers/pci/pcie-sh7786.c
 *  arch/sh/drivers/pci/ops-sh7786.c
 *  Copyright (C) 2009 - 2011  Paul Mundt
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define DRV_NAME "rcar-pcie"

#define PCIECAR			0x000010
#define PCIECCTLR		0x000018
#define  CONFIG_SEND_ENABLE	(1 << 31)
#define  TYPE0			(0 << 8)
#define  TYPE1			(1 << 8)
#define PCIECDR			0x000020
#define PCIEMSR			0x000028
#define PCIEINTXR		0x000400
#define PCIEMSITXR		0x000840

/* Transfer control */
#define PCIETCTLR		0x02000
#define  CFINIT			1
#define PCIETSTR		0x02004
#define  DATA_LINK_ACTIVE	1
#define PCIEERRFR		0x02020
#define  UNSUPPORTED_REQUEST	(1 << 4)
#define PCIEMSIFR		0x02044
#define PCIEMSIALR		0x02048
#define  MSIFE			1
#define PCIEMSIAUR		0x0204c
#define PCIEMSIIER		0x02050

/* root port address */
#define PCIEPRAR(x)		(0x02080 + ((x) * 0x4))

/* local address reg & mask */
#define PCIELAR(x)		(0x02200 + ((x) * 0x20))
#define PCIELAMR(x)		(0x02208 + ((x) * 0x20))
#define  LAM_PREFETCH		(1 << 3)
#define  LAM_64BIT		(1 << 2)
#define  LAR_ENABLE		(1 << 1)

/* PCIe address reg & mask */
#define PCIEPALR(x)		(0x03400 + ((x) * 0x20))
#define PCIEPAUR(x)		(0x03404 + ((x) * 0x20))
#define PCIEPAMR(x)		(0x03408 + ((x) * 0x20))
#define PCIEPTCTLR(x)		(0x0340c + ((x) * 0x20))
#define  PAR_ENABLE		(1 << 31)
#define  IO_SPACE		(1 << 8)

/* Configuration */
#define PCICONF(x)		(0x010000 + ((x) * 0x4))
#define PMCAP(x)		(0x010040 + ((x) * 0x4))
#define EXPCAP(x)		(0x010070 + ((x) * 0x4))
#define VCCAP(x)		(0x010100 + ((x) * 0x4))

/* link layer */
#define IDSETR1			0x011004
#define TLCTLR			0x011048
#define MACSR			0x011054
#define MACCTLR			0x011058
#define  SCRAMBLE_DISABLE	(1 << 27)

/* R-Car H1 PHY */
#define H1_PCIEPHYADRR		0x04000c
#define  WRITE_CMD		(1 << 16)
#define  PHY_ACK		(1 << 24)
#define  RATE_POS		12
#define  LANE_POS		8
#define  ADR_POS		0
#define H1_PCIEPHYDOUTR		0x040014
#define H1_PCIEPHYSR		0x040018

#define INT_PCI_MSI_NR	32

#define RCONF(x)	(PCICONF(0)+(x))
#define RPMCAP(x)	(PMCAP(0)+(x))
#define REXPCAP(x)	(EXPCAP(0)+(x))
#define RVCCAP(x)	(VCCAP(0)+(x))

#define  PCIE_CONF_BUS(b)	(((b) & 0xff) << 24)
#define  PCIE_CONF_DEV(d)	(((d) & 0x1f) << 19)
#define  PCIE_CONF_FUNC(f)	(((f) & 0x7) << 16)

#define RCAR_PCI_MAX_RESOURCES 4
#define MAX_NR_INBOUND_MAPS 6

static unsigned long global_io_offset;

struct rcar_msi {
	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
	struct irq_domain *domain;
	struct msi_controller chip;
	unsigned long pages;
	struct mutex lock;
	int irq1;
	int irq2;
};

static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip)
{
	return container_of(chip, struct rcar_msi, chip);
}

/* Structure representing the PCIe interface */
/*
 * ARM pcibios functions expect the ARM struct pci_sys_data as the PCI
 * sysdata.  Add pci_sys_data as the first element in struct gen_pci so
 * that when we use a gen_pci pointer as sysdata, it is also a pointer to
 * a struct pci_sys_data.
 */
struct rcar_pcie {
#ifdef CONFIG_ARM
	struct pci_sys_data	sys;
#endif
	struct device		*dev;
	void __iomem		*base;
	struct resource		res[RCAR_PCI_MAX_RESOURCES];
	struct resource		busn;
	int			root_bus_nr;
	struct clk		*clk;
	struct clk		*bus_clk;
	struct			rcar_msi msi;
};

static void rcar_pci_write_reg(struct rcar_pcie *pcie, unsigned long val,
			       unsigned long reg)
{
	writel(val, pcie->base + reg);
}

static unsigned long rcar_pci_read_reg(struct rcar_pcie *pcie,
				       unsigned long reg)
{
	return readl(pcie->base + reg);
}

enum {
	RCAR_PCI_ACCESS_READ,
	RCAR_PCI_ACCESS_WRITE,
};

static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
{
	int shift = 8 * (where & 3);
	u32 val = rcar_pci_read_reg(pcie, where & ~3);

	val &= ~(mask << shift);
	val |= data << shift;
	rcar_pci_write_reg(pcie, val, where & ~3);
}

static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
{
	int shift = 8 * (where & 3);
	u32 val = rcar_pci_read_reg(pcie, where & ~3);

	return val >> shift;
}

/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
static int rcar_pcie_config_access(struct rcar_pcie *pcie,
		unsigned char access_type, struct pci_bus *bus,
		unsigned int devfn, int where, u32 *data)
{
	int dev, func, reg, index;

	dev = PCI_SLOT(devfn);
	func = PCI_FUNC(devfn);
	reg = where & ~3;
	index = reg / 4;

	/*
	 * While each channel has its own memory-mapped extended config
	 * space, it's generally only accessible when in endpoint mode.
	 * When in root complex mode, the controller is unable to target
	 * itself with either type 0 or type 1 accesses, and indeed, any
	 * controller initiated target transfer to its own config space
	 * result in a completer abort.
	 *
	 * Each channel effectively only supports a single device, but as
	 * the same channel <-> device access works for any PCI_SLOT()
	 * value, we cheat a bit here and bind the controller's config
	 * space to devfn 0 in order to enable self-enumeration. In this
	 * case the regular ECAR/ECDR path is sidelined and the mangled
	 * config access itself is initiated as an internal bus transaction.
	 */
	if (pci_is_root_bus(bus)) {
		if (dev != 0)
			return PCIBIOS_DEVICE_NOT_FOUND;

		if (access_type == RCAR_PCI_ACCESS_READ) {
			*data = rcar_pci_read_reg(pcie, PCICONF(index));
		} else {
			/* Keep an eye out for changes to the root bus number */
			if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS))
				pcie->root_bus_nr = *data & 0xff;

			rcar_pci_write_reg(pcie, *data, PCICONF(index));
		}

		return PCIBIOS_SUCCESSFUL;
	}

	if (pcie->root_bus_nr < 0)
		return PCIBIOS_DEVICE_NOT_FOUND;

	/* Clear errors */
	rcar_pci_write_reg(pcie, rcar_pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);

	/* Set the PIO address */
	rcar_pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) |
		PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR);

	/* Enable the configuration access */
	if (bus->parent->number == pcie->root_bus_nr)
		rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
	else
		rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR);

	/* Check for errors */
	if (rcar_pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST)
		return PCIBIOS_DEVICE_NOT_FOUND;

	/* Check for master and target aborts */
	if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) &
		(PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
		return PCIBIOS_DEVICE_NOT_FOUND;

	if (access_type == RCAR_PCI_ACCESS_READ)
		*data = rcar_pci_read_reg(pcie, PCIECDR);
	else
		rcar_pci_write_reg(pcie, *data, PCIECDR);

	/* Disable the configuration access */
	rcar_pci_write_reg(pcie, 0, PCIECCTLR);

	return PCIBIOS_SUCCESSFUL;
}

static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
			       int where, int size, u32 *val)
{
	struct rcar_pcie *pcie = bus->sysdata;
	int ret;

	ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
				      bus, devfn, where, val);
	if (ret != PCIBIOS_SUCCESSFUL) {
		*val = 0xffffffff;
		return ret;
	}

	if (size == 1)
		*val = (*val >> (8 * (where & 3))) & 0xff;
	else if (size == 2)
		*val = (*val >> (8 * (where & 2))) & 0xffff;

	dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
		bus->number, devfn, where, size, (unsigned long)*val);

	return ret;
}

/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
				int where, int size, u32 val)
{
	struct rcar_pcie *pcie = bus->sysdata;
	int shift, ret;
	u32 data;

	ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
				      bus, devfn, where, &data);
	if (ret != PCIBIOS_SUCCESSFUL)
		return ret;

	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08lx\n",
		bus->number, devfn, where, size, (unsigned long)val);

	if (size == 1) {
		shift = 8 * (where & 3);
		data &= ~(0xff << shift);
		data |= ((val & 0xff) << shift);
	} else if (size == 2) {
		shift = 8 * (where & 2);
		data &= ~(0xffff << shift);
		data |= ((val & 0xffff) << shift);
	} else
		data = val;

	ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_WRITE,
				      bus, devfn, where, &data);

	return ret;
}

static struct pci_ops rcar_pcie_ops = {
	.read	= rcar_pcie_read_conf,
	.write	= rcar_pcie_write_conf,
};

static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie)
{
	struct resource *res = &pcie->res[win];

	/* Setup PCIe address space mappings for each resource */
	resource_size_t size;
	resource_size_t res_start;
	u32 mask;

	rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win));

	/*
	 * The PAMR mask is calculated in units of 128Bytes, which
	 * keeps things pretty simple.
	 */
	size = resource_size(res);
	mask = (roundup_pow_of_two(size) / SZ_128) - 1;
	rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win));

	if (res->flags & IORESOURCE_IO)
		res_start = pci_pio_to_address(res->start);
	else
		res_start = res->start;

	rcar_pci_write_reg(pcie, upper_32_bits(res_start), PCIEPAUR(win));
	rcar_pci_write_reg(pcie, lower_32_bits(res_start) & ~0x7F,
			   PCIEPALR(win));

	/* First resource is for IO */
	mask = PAR_ENABLE;
	if (res->flags & IORESOURCE_IO)
		mask |= IO_SPACE;

	rcar_pci_write_reg(pcie, mask, PCIEPTCTLR(win));
}

static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pcie)
{
	struct resource *res;
	int i;

	pcie->root_bus_nr = pcie->busn.start;

	/* Setup PCI resources */
	for (i = 0; i < RCAR_PCI_MAX_RESOURCES; i++) {

		res = &pcie->res[i];
		if (!res->flags)
			continue;

		rcar_pcie_setup_window(i, pcie);

		if (res->flags & IORESOURCE_IO) {
			phys_addr_t io_start = pci_pio_to_address(res->start);
			pci_ioremap_io(global_io_offset, io_start);
			global_io_offset += SZ_64K;
		}

		pci_add_resource(resource, res);
	}
	pci_add_resource(resource, &pcie->busn);

	return 1;
}

static int rcar_pcie_enable(struct rcar_pcie *pcie)
{
	struct pci_bus *bus, *child;
	LIST_HEAD(res);

	rcar_pcie_setup(&res, pcie);

	/* Do not reassign resources if probe only */
	if (!pci_has_flag(PCI_PROBE_ONLY))
		pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);

	if (IS_ENABLED(CONFIG_PCI_MSI))
		bus = pci_scan_root_bus_msi(pcie->dev, pcie->root_bus_nr,
				&rcar_pcie_ops, pcie, &res, &pcie->msi.chip);
	else
		bus = pci_scan_root_bus(pcie->dev, pcie->root_bus_nr,
				&rcar_pcie_ops, pcie, &res);

	if (!bus) {
		dev_err(pcie->dev, "Scanning rootbus failed");
		return -ENODEV;
	}

	pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);

	if (!pci_has_flag(PCI_PROBE_ONLY)) {
		pci_bus_size_bridges(bus);
		pci_bus_assign_resources(bus);

		list_for_each_entry(child, &bus->children, node)
			pcie_bus_configure_settings(child);
	}

	pci_bus_add_devices(bus);

	return 0;
}

static int phy_wait_for_ack(struct rcar_pcie *pcie)
{
	unsigned int timeout = 100;

	while (timeout--) {
		if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
			return 0;

		udelay(100);
	}

	dev_err(pcie->dev, "Access to PCIe phy timed out\n");

	return -ETIMEDOUT;
}

static void phy_write_reg(struct rcar_pcie *pcie,
				 unsigned int rate, unsigned int addr,
				 unsigned int lane, unsigned int data)
{
	unsigned long phyaddr;

	phyaddr = WRITE_CMD |
		((rate & 1) << RATE_POS) |
		((lane & 0xf) << LANE_POS) |
		((addr & 0xff) << ADR_POS);

	/* Set write data */
	rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
	rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);

	/* Ignore errors as they will be dealt with if the data link is down */
	phy_wait_for_ack(pcie);

	/* Clear command */
	rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
	rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR);

	/* Ignore errors as they will be dealt with if the data link is down */
	phy_wait_for_ack(pcie);
}

static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
{
	unsigned int timeout = 10;

	while (timeout--) {
		if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
			return 0;

		msleep(5);
	}

	return -ETIMEDOUT;
}

static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
{
	int err;

	/* Begin initialization */
	rcar_pci_write_reg(pcie, 0, PCIETCTLR);

	/* Set mode */
	rcar_pci_write_reg(pcie, 1, PCIEMSR);

	/*
	 * Initial header for port config space is type 1, set the device
	 * class to match. Hardware takes care of propagating the IDSETR
	 * settings, so there is no need to bother with a quirk.
	 */
	rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1);

	/*
	 * Setup Secondary Bus Number & Subordinate Bus Number, even though
	 * they aren't used, to avoid bridge being detected as broken.
	 */
	rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
	rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);

	/* Initialize default capabilities. */
	rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
	rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
		PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
	rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f,
		PCI_HEADER_TYPE_BRIDGE);

	/* Enable data link layer active state reporting */
	rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC,
		PCI_EXP_LNKCAP_DLLLARC);

	/* Write out the physical slot number = 0 */
	rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0);

	/* Set the completion timer timeout to the maximum 50ms. */
	rcar_rmw32(pcie, TLCTLR + 1, 0x3f, 50);

	/* Terminate list of capabilities (Next Capability Offset=0) */
	rcar_rmw32(pcie, RVCCAP(0), 0xfff00000, 0);

	/* Enable MSI */
	if (IS_ENABLED(CONFIG_PCI_MSI))
		rcar_pci_write_reg(pcie, 0x801f0000, PCIEMSITXR);

	/* Finish initialization - establish a PCI Express link */
	rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);

	/* This will timeout if we don't have a link. */
	err = rcar_pcie_wait_for_dl(pcie);
	if (err)
		return err;

	/* Enable INTx interrupts */
	rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8);

	wmb();

	return 0;
}

static int rcar_pcie_hw_init_h1(struct rcar_pcie *pcie)
{
	unsigned int timeout = 10;

	/* Initialize the phy */
	phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191);
	phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180);
	phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188);
	phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188);
	phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014);
	phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014);
	phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0);
	phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB);
	phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062);
	phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000);
	phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000);
	phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806);

	phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5);
	phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F);
	phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000);

	while (timeout--) {
		if (rcar_pci_read_reg(pcie, H1_PCIEPHYSR))
			return rcar_pcie_hw_init(pcie);

		msleep(5);
	}

	return -ETIMEDOUT;
}

static int rcar_msi_alloc(struct rcar_msi *chip)
{
	int msi;

	mutex_lock(&chip->lock);

	msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
	if (msi < INT_PCI_MSI_NR)
		set_bit(msi, chip->used);
	else
		msi = -ENOSPC;

	mutex_unlock(&chip->lock);

	return msi;
}

static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
{
	mutex_lock(&chip->lock);
	clear_bit(irq, chip->used);
	mutex_unlock(&chip->lock);
}

static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
{
	struct rcar_pcie *pcie = data;
	struct rcar_msi *msi = &pcie->msi;
	unsigned long reg;

	reg = rcar_pci_read_reg(pcie, PCIEMSIFR);

	/* MSI & INTx share an interrupt - we only handle MSI here */
	if (!reg)
		return IRQ_NONE;

	while (reg) {
		unsigned int index = find_first_bit(&reg, 32);
		unsigned int irq;

		/* clear the interrupt */
		rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR);

		irq = irq_find_mapping(msi->domain, index);
		if (irq) {
			if (test_bit(index, msi->used))
				generic_handle_irq(irq);
			else
				dev_info(pcie->dev, "unhandled MSI\n");
		} else {
			/* Unknown MSI, just clear it */
			dev_dbg(pcie->dev, "unexpected MSI\n");
		}

		/* see if there's any more pending in this vector */
		reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
	}

	return IRQ_HANDLED;
}

static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
			      struct msi_desc *desc)
{
	struct rcar_msi *msi = to_rcar_msi(chip);
	struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
	struct msi_msg msg;
	unsigned int irq;
	int hwirq;

	hwirq = rcar_msi_alloc(msi);
	if (hwirq < 0)
		return hwirq;

	irq = irq_create_mapping(msi->domain, hwirq);
	if (!irq) {
		rcar_msi_free(msi, hwirq);
		return -EINVAL;
	}

	irq_set_msi_desc(irq, desc);

	msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
	msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
	msg.data = hwirq;

	pci_write_msi_msg(irq, &msg);

	return 0;
}

static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
{
	struct rcar_msi *msi = to_rcar_msi(chip);
	struct irq_data *d = irq_get_irq_data(irq);

	rcar_msi_free(msi, d->hwirq);
}

static struct irq_chip rcar_msi_irq_chip = {
	.name = "R-Car PCIe MSI",
	.irq_enable = pci_msi_unmask_irq,
	.irq_disable = pci_msi_mask_irq,
	.irq_mask = pci_msi_mask_irq,
	.irq_unmask = pci_msi_unmask_irq,
};

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

	return 0;
}

static const struct irq_domain_ops msi_domain_ops = {
	.map = rcar_msi_map,
};

static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
{
	struct platform_device *pdev = to_platform_device(pcie->dev);
	struct rcar_msi *msi = &pcie->msi;
	unsigned long base;
	int err;

	mutex_init(&msi->lock);

	msi->chip.dev = pcie->dev;
	msi->chip.setup_irq = rcar_msi_setup_irq;
	msi->chip.teardown_irq = rcar_msi_teardown_irq;

	msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR,
					    &msi_domain_ops, &msi->chip);
	if (!msi->domain) {
		dev_err(&pdev->dev, "failed to create IRQ domain\n");
		return -ENOMEM;
	}

	/* Two irqs are for MSI, but they are also used for non-MSI irqs */
	err = devm_request_irq(&pdev->dev, msi->irq1, rcar_pcie_msi_irq,
			       IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
		goto err;
	}

	err = devm_request_irq(&pdev->dev, msi->irq2, rcar_pcie_msi_irq,
			       IRQF_SHARED, rcar_msi_irq_chip.name, pcie);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to request IRQ: %d\n", err);
		goto err;
	}

	/* setup MSI data target */
	msi->pages = __get_free_pages(GFP_KERNEL, 0);
	base = virt_to_phys((void *)msi->pages);

	rcar_pci_write_reg(pcie, base | MSIFE, PCIEMSIALR);
	rcar_pci_write_reg(pcie, 0, PCIEMSIAUR);

	/* enable all MSI interrupts */
	rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);

	return 0;

err:
	irq_domain_remove(msi->domain);
	return err;
}

static int rcar_pcie_get_resources(struct platform_device *pdev,
				   struct rcar_pcie *pcie)
{
	struct resource res;
	int err, i;

	err = of_address_to_resource(pdev->dev.of_node, 0, &res);
	if (err)
		return err;

	pcie->clk = devm_clk_get(&pdev->dev, "pcie");
	if (IS_ERR(pcie->clk)) {
		dev_err(pcie->dev, "cannot get platform clock\n");
		return PTR_ERR(pcie->clk);
	}
	err = clk_prepare_enable(pcie->clk);
	if (err)
		goto fail_clk;

	pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
	if (IS_ERR(pcie->bus_clk)) {
		dev_err(pcie->dev, "cannot get pcie bus clock\n");
		err = PTR_ERR(pcie->bus_clk);
		goto fail_clk;
	}
	err = clk_prepare_enable(pcie->bus_clk);
	if (err)
		goto err_map_reg;

	i = irq_of_parse_and_map(pdev->dev.of_node, 0);
	if (!i) {
		dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
		err = -ENOENT;
		goto err_map_reg;
	}
	pcie->msi.irq1 = i;

	i = irq_of_parse_and_map(pdev->dev.of_node, 1);
	if (!i) {
		dev_err(pcie->dev, "cannot get platform resources for msi interrupt\n");
		err = -ENOENT;
		goto err_map_reg;
	}
	pcie->msi.irq2 = i;

	pcie->base = devm_ioremap_resource(&pdev->dev, &res);
	if (IS_ERR(pcie->base)) {
		err = PTR_ERR(pcie->base);
		goto err_map_reg;
	}

	return 0;

err_map_reg:
	clk_disable_unprepare(pcie->bus_clk);
fail_clk:
	clk_disable_unprepare(pcie->clk);

	return err;
}

static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
				    struct of_pci_range *range,
				    int *index)
{
	u64 restype = range->flags;
	u64 cpu_addr = range->cpu_addr;
	u64 cpu_end = range->cpu_addr + range->size;
	u64 pci_addr = range->pci_addr;
	u32 flags = LAM_64BIT | LAR_ENABLE;
	u64 mask;
	u64 size;
	int idx = *index;

	if (restype & IORESOURCE_PREFETCH)
		flags |= LAM_PREFETCH;

	/*
	 * If the size of the range is larger than the alignment of the start
	 * address, we have to use multiple entries to perform the mapping.
	 */
	if (cpu_addr > 0) {
		unsigned long nr_zeros = __ffs64(cpu_addr);
		u64 alignment = 1ULL << nr_zeros;

		size = min(range->size, alignment);
	} else {
		size = range->size;
	}
	/* Hardware supports max 4GiB inbound region */
	size = min(size, 1ULL << 32);

	mask = roundup_pow_of_two(size) - 1;
	mask &= ~0xf;

	while (cpu_addr < cpu_end) {
		/*
		 * Set up 64-bit inbound regions as the range parser doesn't
		 * distinguish between 32 and 64-bit types.
		 */
		rcar_pci_write_reg(pcie, lower_32_bits(pci_addr), PCIEPRAR(idx));
		rcar_pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
		rcar_pci_write_reg(pcie, lower_32_bits(mask) | flags, PCIELAMR(idx));

		rcar_pci_write_reg(pcie, upper_32_bits(pci_addr), PCIEPRAR(idx+1));
		rcar_pci_write_reg(pcie, upper_32_bits(cpu_addr), PCIELAR(idx+1));
		rcar_pci_write_reg(pcie, 0, PCIELAMR(idx + 1));

		pci_addr += size;
		cpu_addr += size;
		idx += 2;

		if (idx > MAX_NR_INBOUND_MAPS) {
			dev_err(pcie->dev, "Failed to map inbound regions!\n");
			return -EINVAL;
		}
	}
	*index = idx;

	return 0;
}

static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
				     struct device_node *node)
{
	const int na = 3, ns = 2;
	int rlen;

	parser->node = node;
	parser->pna = of_n_addr_cells(node);
	parser->np = parser->pna + na + ns;

	parser->range = of_get_property(node, "dma-ranges", &rlen);
	if (!parser->range)
		return -ENOENT;

	parser->end = parser->range + rlen / sizeof(__be32);
	return 0;
}

static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie,
					  struct device_node *np)
{
	struct of_pci_range range;
	struct of_pci_range_parser parser;
	int index = 0;
	int err;

	if (pci_dma_range_parser_init(&parser, np))
		return -EINVAL;

	/* Get the dma-ranges from DT */
	for_each_of_pci_range(&parser, &range) {
		u64 end = range.cpu_addr + range.size - 1;
		dev_dbg(pcie->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
			range.flags, range.cpu_addr, end, range.pci_addr);

		err = rcar_pcie_inbound_ranges(pcie, &range, &index);
		if (err)
			return err;
	}

	return 0;
}

static const struct of_device_id rcar_pcie_of_match[] = {
	{ .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 },
	{ .compatible = "renesas,pcie-r8a7790", .data = rcar_pcie_hw_init },
	{ .compatible = "renesas,pcie-r8a7791", .data = rcar_pcie_hw_init },
	{},
};
MODULE_DEVICE_TABLE(of, rcar_pcie_of_match);

static int rcar_pcie_probe(struct platform_device *pdev)
{
	struct rcar_pcie *pcie;
	unsigned int data;
	struct of_pci_range range;
	struct of_pci_range_parser parser;
	const struct of_device_id *of_id;
	int err, win = 0;
	int (*hw_init_fn)(struct rcar_pcie *);

	pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
	if (!pcie)
		return -ENOMEM;

	pcie->dev = &pdev->dev;
	platform_set_drvdata(pdev, pcie);

	/* Get the bus range */
	if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
		dev_err(&pdev->dev, "failed to parse bus-range property\n");
		return -EINVAL;
	}

	if (of_pci_range_parser_init(&parser, pdev->dev.of_node)) {
		dev_err(&pdev->dev, "missing ranges property\n");
		return -EINVAL;
	}

	err = rcar_pcie_get_resources(pdev, pcie);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to request resources: %d\n", err);
		return err;
	}

	for_each_of_pci_range(&parser, &range) {
		err = of_pci_range_to_resource(&range, pdev->dev.of_node,
						&pcie->res[win++]);
		if (err < 0)
			return err;

		if (win > RCAR_PCI_MAX_RESOURCES)
			break;
	}

	 err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node);
	 if (err)
		return err;

	if (IS_ENABLED(CONFIG_PCI_MSI)) {
		err = rcar_pcie_enable_msi(pcie);
		if (err < 0) {
			dev_err(&pdev->dev,
				"failed to enable MSI support: %d\n",
				err);
			return err;
		}
	}

	of_id = of_match_device(rcar_pcie_of_match, pcie->dev);
	if (!of_id || !of_id->data)
		return -EINVAL;
	hw_init_fn = of_id->data;

	/* Failure to get a link might just be that no cards are inserted */
	err = hw_init_fn(pcie);
	if (err) {
		dev_info(&pdev->dev, "PCIe link down\n");
		return 0;
	}

	data = rcar_pci_read_reg(pcie, MACSR);
	dev_info(&pdev->dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);

	return rcar_pcie_enable(pcie);
}

static struct platform_driver rcar_pcie_driver = {
	.driver = {
		.name = DRV_NAME,
		.of_match_table = rcar_pcie_of_match,
		.suppress_bind_attrs = true,
	},
	.probe = rcar_pcie_probe,
};
module_platform_driver(rcar_pcie_driver);

MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>");
MODULE_DESCRIPTION("Renesas R-Car PCIe driver");
MODULE_LICENSE("GPL v2");