summaryrefslogtreecommitdiff
path: root/drivers/pci/host/pcie-xilinx.c
blob: 4cfa46360d1229976533f3a0c42152c30a282099 (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
/*
 * PCIe host controller driver for Xilinx AXI PCIe Bridge
 *
 * Copyright (c) 2012 - 2014 Xilinx, Inc.
 *
 * Based on the Tegra PCIe driver
 *
 * Bits taken from Synopsys Designware Host controller driver and
 * ARM PCI Host generic driver.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 */

#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_pci.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
#include <linux/pci.h>
#include <linux/platform_device.h>

/* Register definitions */
#define XILINX_PCIE_REG_BIR		0x00000130
#define XILINX_PCIE_REG_IDR		0x00000138
#define XILINX_PCIE_REG_IMR		0x0000013c
#define XILINX_PCIE_REG_PSCR		0x00000144
#define XILINX_PCIE_REG_RPSC		0x00000148
#define XILINX_PCIE_REG_MSIBASE1	0x0000014c
#define XILINX_PCIE_REG_MSIBASE2	0x00000150
#define XILINX_PCIE_REG_RPEFR		0x00000154
#define XILINX_PCIE_REG_RPIFR1		0x00000158
#define XILINX_PCIE_REG_RPIFR2		0x0000015c

/* Interrupt registers definitions */
#define XILINX_PCIE_INTR_LINK_DOWN	BIT(0)
#define XILINX_PCIE_INTR_ECRC_ERR	BIT(1)
#define XILINX_PCIE_INTR_STR_ERR	BIT(2)
#define XILINX_PCIE_INTR_HOT_RESET	BIT(3)
#define XILINX_PCIE_INTR_CFG_TIMEOUT	BIT(8)
#define XILINX_PCIE_INTR_CORRECTABLE	BIT(9)
#define XILINX_PCIE_INTR_NONFATAL	BIT(10)
#define XILINX_PCIE_INTR_FATAL		BIT(11)
#define XILINX_PCIE_INTR_INTX		BIT(16)
#define XILINX_PCIE_INTR_MSI		BIT(17)
#define XILINX_PCIE_INTR_SLV_UNSUPP	BIT(20)
#define XILINX_PCIE_INTR_SLV_UNEXP	BIT(21)
#define XILINX_PCIE_INTR_SLV_COMPL	BIT(22)
#define XILINX_PCIE_INTR_SLV_ERRP	BIT(23)
#define XILINX_PCIE_INTR_SLV_CMPABT	BIT(24)
#define XILINX_PCIE_INTR_SLV_ILLBUR	BIT(25)
#define XILINX_PCIE_INTR_MST_DECERR	BIT(26)
#define XILINX_PCIE_INTR_MST_SLVERR	BIT(27)
#define XILINX_PCIE_INTR_MST_ERRP	BIT(28)
#define XILINX_PCIE_IMR_ALL_MASK	0x1FF30FED
#define XILINX_PCIE_IDR_ALL_MASK	0xFFFFFFFF

/* Root Port Error FIFO Read Register definitions */
#define XILINX_PCIE_RPEFR_ERR_VALID	BIT(18)
#define XILINX_PCIE_RPEFR_REQ_ID	GENMASK(15, 0)
#define XILINX_PCIE_RPEFR_ALL_MASK	0xFFFFFFFF

/* Root Port Interrupt FIFO Read Register 1 definitions */
#define XILINX_PCIE_RPIFR1_INTR_VALID	BIT(31)
#define XILINX_PCIE_RPIFR1_MSI_INTR	BIT(30)
#define XILINX_PCIE_RPIFR1_INTR_MASK	GENMASK(28, 27)
#define XILINX_PCIE_RPIFR1_ALL_MASK	0xFFFFFFFF
#define XILINX_PCIE_RPIFR1_INTR_SHIFT	27

/* Bridge Info Register definitions */
#define XILINX_PCIE_BIR_ECAM_SZ_MASK	GENMASK(18, 16)
#define XILINX_PCIE_BIR_ECAM_SZ_SHIFT	16

/* Root Port Interrupt FIFO Read Register 2 definitions */
#define XILINX_PCIE_RPIFR2_MSG_DATA	GENMASK(15, 0)

/* Root Port Status/control Register definitions */
#define XILINX_PCIE_REG_RPSC_BEN	BIT(0)

/* Phy Status/Control Register definitions */
#define XILINX_PCIE_REG_PSCR_LNKUP	BIT(11)

/* ECAM definitions */
#define ECAM_BUS_NUM_SHIFT		20
#define ECAM_DEV_NUM_SHIFT		12

/* Number of MSI IRQs */
#define XILINX_NUM_MSI_IRQS		128

/* Number of Memory Resources */
#define XILINX_MAX_NUM_RESOURCES	3

/**
 * struct xilinx_pcie_port - PCIe port information
 * @reg_base: IO Mapped Register Base
 * @irq: Interrupt number
 * @msi_pages: MSI pages
 * @root_busno: Root Bus number
 * @dev: Device pointer
 * @irq_domain: IRQ domain pointer
 * @bus_range: Bus range
 * @resources: Bus Resources
 */
struct xilinx_pcie_port {
	void __iomem *reg_base;
	u32 irq;
	unsigned long msi_pages;
	u8 root_busno;
	struct device *dev;
	struct irq_domain *irq_domain;
	struct resource bus_range;
	struct list_head resources;
};

static DECLARE_BITMAP(msi_irq_in_use, XILINX_NUM_MSI_IRQS);

static inline struct xilinx_pcie_port *sys_to_pcie(struct pci_sys_data *sys)
{
	return sys->private_data;
}

static inline u32 pcie_read(struct xilinx_pcie_port *port, u32 reg)
{
	return readl(port->reg_base + reg);
}

static inline void pcie_write(struct xilinx_pcie_port *port, u32 val, u32 reg)
{
	writel(val, port->reg_base + reg);
}

static inline bool xilinx_pcie_link_is_up(struct xilinx_pcie_port *port)
{
	return (pcie_read(port, XILINX_PCIE_REG_PSCR) &
		XILINX_PCIE_REG_PSCR_LNKUP) ? 1 : 0;
}

/**
 * xilinx_pcie_clear_err_interrupts - Clear Error Interrupts
 * @port: PCIe port information
 */
static void xilinx_pcie_clear_err_interrupts(struct xilinx_pcie_port *port)
{
	unsigned long val = pcie_read(port, XILINX_PCIE_REG_RPEFR);

	if (val & XILINX_PCIE_RPEFR_ERR_VALID) {
		dev_dbg(port->dev, "Requester ID %lu\n",
			val & XILINX_PCIE_RPEFR_REQ_ID);
		pcie_write(port, XILINX_PCIE_RPEFR_ALL_MASK,
			   XILINX_PCIE_REG_RPEFR);
	}
}

/**
 * xilinx_pcie_valid_device - Check if a valid device is present on bus
 * @bus: PCI Bus structure
 * @devfn: device/function
 *
 * Return: 'true' on success and 'false' if invalid device is found
 */
static bool xilinx_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
{
	struct xilinx_pcie_port *port = sys_to_pcie(bus->sysdata);

	/* Check if link is up when trying to access downstream ports */
	if (bus->number != port->root_busno)
		if (!xilinx_pcie_link_is_up(port))
			return false;

	/* Only one device down on each root port */
	if (bus->number == port->root_busno && devfn > 0)
		return false;

	/*
	 * Do not read more than one device on the bus directly attached
	 * to RC.
	 */
	if (bus->primary == port->root_busno && devfn > 0)
		return false;

	return true;
}

/**
 * xilinx_pcie_map_bus - Get configuration base
 * @bus: PCI Bus structure
 * @devfn: Device/function
 * @where: Offset from base
 *
 * Return: Base address of the configuration space needed to be
 *	   accessed.
 */
static void __iomem *xilinx_pcie_map_bus(struct pci_bus *bus,
					 unsigned int devfn, int where)
{
	struct xilinx_pcie_port *port = sys_to_pcie(bus->sysdata);
	int relbus;

	if (!xilinx_pcie_valid_device(bus, devfn))
		return NULL;

	relbus = (bus->number << ECAM_BUS_NUM_SHIFT) |
		 (devfn << ECAM_DEV_NUM_SHIFT);

	return port->reg_base + relbus + where;
}

/* PCIe operations */
static struct pci_ops xilinx_pcie_ops = {
	.map_bus = xilinx_pcie_map_bus,
	.read	= pci_generic_config_read,
	.write	= pci_generic_config_write,
};

/* MSI functions */

/**
 * xilinx_pcie_destroy_msi - Free MSI number
 * @irq: IRQ to be freed
 */
static void xilinx_pcie_destroy_msi(unsigned int irq)
{
	struct msi_desc *msi;
	struct xilinx_pcie_port *port;

	if (!test_bit(irq, msi_irq_in_use)) {
		msi = irq_get_msi_desc(irq);
		port = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
		dev_err(port->dev, "Trying to free unused MSI#%d\n", irq);
	} else {
		clear_bit(irq, msi_irq_in_use);
	}
}

/**
 * xilinx_pcie_assign_msi - Allocate MSI number
 * @port: PCIe port structure
 *
 * Return: A valid IRQ on success and error value on failure.
 */
static int xilinx_pcie_assign_msi(struct xilinx_pcie_port *port)
{
	int pos;

	pos = find_first_zero_bit(msi_irq_in_use, XILINX_NUM_MSI_IRQS);
	if (pos < XILINX_NUM_MSI_IRQS)
		set_bit(pos, msi_irq_in_use);
	else
		return -ENOSPC;

	return pos;
}

/**
 * xilinx_msi_teardown_irq - Destroy the MSI
 * @chip: MSI Chip descriptor
 * @irq: MSI IRQ to destroy
 */
static void xilinx_msi_teardown_irq(struct msi_controller *chip,
				    unsigned int irq)
{
	xilinx_pcie_destroy_msi(irq);
}

/**
 * xilinx_pcie_msi_setup_irq - Setup MSI request
 * @chip: MSI chip pointer
 * @pdev: PCIe device pointer
 * @desc: MSI descriptor pointer
 *
 * Return: '0' on success and error value on failure
 */
static int xilinx_pcie_msi_setup_irq(struct msi_controller *chip,
				     struct pci_dev *pdev,
				     struct msi_desc *desc)
{
	struct xilinx_pcie_port *port = sys_to_pcie(pdev->bus->sysdata);
	unsigned int irq;
	int hwirq;
	struct msi_msg msg;
	phys_addr_t msg_addr;

	hwirq = xilinx_pcie_assign_msi(port);
	if (hwirq < 0)
		return hwirq;

	irq = irq_create_mapping(port->irq_domain, hwirq);
	if (!irq)
		return -EINVAL;

	irq_set_msi_desc(irq, desc);

	msg_addr = virt_to_phys((void *)port->msi_pages);

	msg.address_hi = 0;
	msg.address_lo = msg_addr;
	msg.data = irq;

	pci_write_msi_msg(irq, &msg);

	return 0;
}

/* MSI Chip Descriptor */
static struct msi_controller xilinx_pcie_msi_chip = {
	.setup_irq = xilinx_pcie_msi_setup_irq,
	.teardown_irq = xilinx_msi_teardown_irq,
};

/* HW Interrupt Chip Descriptor */
static struct irq_chip xilinx_msi_irq_chip = {
	.name = "Xilinx 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,
};

/**
 * xilinx_pcie_msi_map - Set the handler for the MSI and mark IRQ as valid
 * @domain: IRQ domain
 * @irq: Virtual IRQ number
 * @hwirq: HW interrupt number
 *
 * Return: Always returns 0.
 */
static int xilinx_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
			       irq_hw_number_t hwirq)
{
	irq_set_chip_and_handler(irq, &xilinx_msi_irq_chip, handle_simple_irq);
	irq_set_chip_data(irq, domain->host_data);

	return 0;
}

/* IRQ Domain operations */
static const struct irq_domain_ops msi_domain_ops = {
	.map = xilinx_pcie_msi_map,
};

/**
 * xilinx_pcie_enable_msi - Enable MSI support
 * @port: PCIe port information
 */
static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
{
	phys_addr_t msg_addr;

	port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
	msg_addr = virt_to_phys((void *)port->msi_pages);
	pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
	pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
}

/* INTx Functions */

/**
 * xilinx_pcie_intx_map - Set the handler for the INTx and mark IRQ as valid
 * @domain: IRQ domain
 * @irq: Virtual IRQ number
 * @hwirq: HW interrupt number
 *
 * Return: Always returns 0.
 */
static int xilinx_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;
}

/* INTx IRQ Domain operations */
static const struct irq_domain_ops intx_domain_ops = {
	.map = xilinx_pcie_intx_map,
};

/* PCIe HW Functions */

/**
 * xilinx_pcie_intr_handler - Interrupt Service Handler
 * @irq: IRQ number
 * @data: PCIe port information
 *
 * Return: IRQ_HANDLED on success and IRQ_NONE on failure
 */
static irqreturn_t xilinx_pcie_intr_handler(int irq, void *data)
{
	struct xilinx_pcie_port *port = (struct xilinx_pcie_port *)data;
	u32 val, mask, status, msi_data;

	/* Read interrupt decode and mask registers */
	val = pcie_read(port, XILINX_PCIE_REG_IDR);
	mask = pcie_read(port, XILINX_PCIE_REG_IMR);

	status = val & mask;
	if (!status)
		return IRQ_NONE;

	if (status & XILINX_PCIE_INTR_LINK_DOWN)
		dev_warn(port->dev, "Link Down\n");

	if (status & XILINX_PCIE_INTR_ECRC_ERR)
		dev_warn(port->dev, "ECRC failed\n");

	if (status & XILINX_PCIE_INTR_STR_ERR)
		dev_warn(port->dev, "Streaming error\n");

	if (status & XILINX_PCIE_INTR_HOT_RESET)
		dev_info(port->dev, "Hot reset\n");

	if (status & XILINX_PCIE_INTR_CFG_TIMEOUT)
		dev_warn(port->dev, "ECAM access timeout\n");

	if (status & XILINX_PCIE_INTR_CORRECTABLE) {
		dev_warn(port->dev, "Correctable error message\n");
		xilinx_pcie_clear_err_interrupts(port);
	}

	if (status & XILINX_PCIE_INTR_NONFATAL) {
		dev_warn(port->dev, "Non fatal error message\n");
		xilinx_pcie_clear_err_interrupts(port);
	}

	if (status & XILINX_PCIE_INTR_FATAL) {
		dev_warn(port->dev, "Fatal error message\n");
		xilinx_pcie_clear_err_interrupts(port);
	}

	if (status & XILINX_PCIE_INTR_INTX) {
		/* INTx interrupt received */
		val = pcie_read(port, XILINX_PCIE_REG_RPIFR1);

		/* Check whether interrupt valid */
		if (!(val & XILINX_PCIE_RPIFR1_INTR_VALID)) {
			dev_warn(port->dev, "RP Intr FIFO1 read error\n");
			return IRQ_HANDLED;
		}

		if (!(val & XILINX_PCIE_RPIFR1_MSI_INTR)) {
			/* Clear interrupt FIFO register 1 */
			pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK,
				   XILINX_PCIE_REG_RPIFR1);

			/* Handle INTx Interrupt */
			val = ((val & XILINX_PCIE_RPIFR1_INTR_MASK) >>
				XILINX_PCIE_RPIFR1_INTR_SHIFT) + 1;
			generic_handle_irq(irq_find_mapping(port->irq_domain,
							    val));
		}
	}

	if (status & XILINX_PCIE_INTR_MSI) {
		/* MSI Interrupt */
		val = pcie_read(port, XILINX_PCIE_REG_RPIFR1);

		if (!(val & XILINX_PCIE_RPIFR1_INTR_VALID)) {
			dev_warn(port->dev, "RP Intr FIFO1 read error\n");
			return IRQ_HANDLED;
		}

		if (val & XILINX_PCIE_RPIFR1_MSI_INTR) {
			msi_data = pcie_read(port, XILINX_PCIE_REG_RPIFR2) &
				   XILINX_PCIE_RPIFR2_MSG_DATA;

			/* Clear interrupt FIFO register 1 */
			pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK,
				   XILINX_PCIE_REG_RPIFR1);

			if (IS_ENABLED(CONFIG_PCI_MSI)) {
				/* Handle MSI Interrupt */
				generic_handle_irq(msi_data);
			}
		}
	}

	if (status & XILINX_PCIE_INTR_SLV_UNSUPP)
		dev_warn(port->dev, "Slave unsupported request\n");

	if (status & XILINX_PCIE_INTR_SLV_UNEXP)
		dev_warn(port->dev, "Slave unexpected completion\n");

	if (status & XILINX_PCIE_INTR_SLV_COMPL)
		dev_warn(port->dev, "Slave completion timeout\n");

	if (status & XILINX_PCIE_INTR_SLV_ERRP)
		dev_warn(port->dev, "Slave Error Poison\n");

	if (status & XILINX_PCIE_INTR_SLV_CMPABT)
		dev_warn(port->dev, "Slave Completer Abort\n");

	if (status & XILINX_PCIE_INTR_SLV_ILLBUR)
		dev_warn(port->dev, "Slave Illegal Burst\n");

	if (status & XILINX_PCIE_INTR_MST_DECERR)
		dev_warn(port->dev, "Master decode error\n");

	if (status & XILINX_PCIE_INTR_MST_SLVERR)
		dev_warn(port->dev, "Master slave error\n");

	if (status & XILINX_PCIE_INTR_MST_ERRP)
		dev_warn(port->dev, "Master error poison\n");

	/* Clear the Interrupt Decode register */
	pcie_write(port, status, XILINX_PCIE_REG_IDR);

	return IRQ_HANDLED;
}

/**
 * xilinx_pcie_free_irq_domain - Free IRQ domain
 * @port: PCIe port information
 */
static void xilinx_pcie_free_irq_domain(struct xilinx_pcie_port *port)
{
	int i;
	u32 irq, num_irqs;

	/* Free IRQ Domain */
	if (IS_ENABLED(CONFIG_PCI_MSI)) {

		free_pages(port->msi_pages, 0);

		num_irqs = XILINX_NUM_MSI_IRQS;
	} else {
		/* INTx */
		num_irqs = 4;
	}

	for (i = 0; i < num_irqs; i++) {
		irq = irq_find_mapping(port->irq_domain, i);
		if (irq > 0)
			irq_dispose_mapping(irq);
	}

	irq_domain_remove(port->irq_domain);
}

/**
 * xilinx_pcie_init_irq_domain - Initialize IRQ domain
 * @port: PCIe port information
 *
 * Return: '0' on success and error value on failure
 */
static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
{
	struct device *dev = port->dev;
	struct device_node *node = dev->of_node;
	struct device_node *pcie_intc_node;

	/* Setup INTx */
	pcie_intc_node = of_get_next_child(node, NULL);
	if (!pcie_intc_node) {
		dev_err(dev, "No PCIe Intc node found\n");
		return PTR_ERR(pcie_intc_node);
	}

	port->irq_domain = irq_domain_add_linear(pcie_intc_node, 4,
						 &intx_domain_ops,
						 port);
	if (!port->irq_domain) {
		dev_err(dev, "Failed to get a INTx IRQ domain\n");
		return PTR_ERR(port->irq_domain);
	}

	/* Setup MSI */
	if (IS_ENABLED(CONFIG_PCI_MSI)) {
		port->irq_domain = irq_domain_add_linear(node,
							 XILINX_NUM_MSI_IRQS,
							 &msi_domain_ops,
							 &xilinx_pcie_msi_chip);
		if (!port->irq_domain) {
			dev_err(dev, "Failed to get a MSI IRQ domain\n");
			return PTR_ERR(port->irq_domain);
		}

		xilinx_pcie_enable_msi(port);
	}

	return 0;
}

/**
 * xilinx_pcie_init_port - Initialize hardware
 * @port: PCIe port information
 */
static void xilinx_pcie_init_port(struct xilinx_pcie_port *port)
{
	if (xilinx_pcie_link_is_up(port))
		dev_info(port->dev, "PCIe Link is UP\n");
	else
		dev_info(port->dev, "PCIe Link is DOWN\n");

	/* Disable all interrupts */
	pcie_write(port, ~XILINX_PCIE_IDR_ALL_MASK,
		   XILINX_PCIE_REG_IMR);

	/* Clear pending interrupts */
	pcie_write(port, pcie_read(port, XILINX_PCIE_REG_IDR) &
			 XILINX_PCIE_IMR_ALL_MASK,
		   XILINX_PCIE_REG_IDR);

	/* Enable all interrupts */
	pcie_write(port, XILINX_PCIE_IMR_ALL_MASK, XILINX_PCIE_REG_IMR);

	/* Enable the Bridge enable bit */
	pcie_write(port, pcie_read(port, XILINX_PCIE_REG_RPSC) |
			 XILINX_PCIE_REG_RPSC_BEN,
		   XILINX_PCIE_REG_RPSC);
}

/**
 * xilinx_pcie_setup - Setup memory resources
 * @nr: Bus number
 * @sys: Per controller structure
 *
 * Return: '1' on success and error value on failure
 */
static int xilinx_pcie_setup(int nr, struct pci_sys_data *sys)
{
	struct xilinx_pcie_port *port = sys_to_pcie(sys);

	list_splice_init(&port->resources, &sys->resources);

	return 1;
}

/**
 * xilinx_pcie_scan_bus - Scan PCIe bus for devices
 * @nr: Bus number
 * @sys: Per controller structure
 *
 * Return: Valid Bus pointer on success and NULL on failure
 */
static struct pci_bus *xilinx_pcie_scan_bus(int nr, struct pci_sys_data *sys)
{
	struct xilinx_pcie_port *port = sys_to_pcie(sys);
	struct pci_bus *bus;

	port->root_busno = sys->busnr;

	if (IS_ENABLED(CONFIG_PCI_MSI))
		bus = pci_scan_root_bus_msi(port->dev, sys->busnr,
					    &xilinx_pcie_ops, sys,
					    &sys->resources,
					    &xilinx_pcie_msi_chip);
	else
		bus = pci_scan_root_bus(port->dev, sys->busnr,
					&xilinx_pcie_ops, sys, &sys->resources);
	return bus;
}

/**
 * xilinx_pcie_parse_and_add_res - Add resources by parsing ranges
 * @port: PCIe port information
 *
 * Return: '0' on success and error value on failure
 */
static int xilinx_pcie_parse_and_add_res(struct xilinx_pcie_port *port)
{
	struct device *dev = port->dev;
	struct device_node *node = dev->of_node;
	struct resource *mem;
	resource_size_t offset;
	struct of_pci_range_parser parser;
	struct of_pci_range range;
	struct resource_entry *win;
	int err = 0, mem_resno = 0;

	/* Get the ranges */
	if (of_pci_range_parser_init(&parser, node)) {
		dev_err(dev, "missing \"ranges\" property\n");
		return -EINVAL;
	}

	/* Parse the ranges and add the resources found to the list */
	for_each_of_pci_range(&parser, &range) {

		if (mem_resno >= XILINX_MAX_NUM_RESOURCES) {
			dev_err(dev, "Maximum memory resources exceeded\n");
			return -EINVAL;
		}

		mem = devm_kmalloc(dev, sizeof(*mem), GFP_KERNEL);
		if (!mem) {
			err = -ENOMEM;
			goto free_resources;
		}

		of_pci_range_to_resource(&range, node, mem);

		switch (mem->flags & IORESOURCE_TYPE_BITS) {
		case IORESOURCE_MEM:
			offset = range.cpu_addr - range.pci_addr;
			mem_resno++;
			break;
		default:
			err = -EINVAL;
			break;
		}

		if (err < 0) {
			dev_warn(dev, "Invalid resource found %pR\n", mem);
			continue;
		}

		err = request_resource(&iomem_resource, mem);
		if (err)
			goto free_resources;

		pci_add_resource_offset(&port->resources, mem, offset);
	}

	/* Get the bus range */
	if (of_pci_parse_bus_range(node, &port->bus_range)) {
		u32 val = pcie_read(port, XILINX_PCIE_REG_BIR);
		u8 last;

		last = (val & XILINX_PCIE_BIR_ECAM_SZ_MASK) >>
			XILINX_PCIE_BIR_ECAM_SZ_SHIFT;

		port->bus_range = (struct resource) {
			.name	= node->name,
			.start	= 0,
			.end	= last,
			.flags	= IORESOURCE_BUS,
		};
	}

	/* Register bus resource */
	pci_add_resource(&port->resources, &port->bus_range);

	return 0;

free_resources:
	release_child_resources(&iomem_resource);
	resource_list_for_each_entry(win, &port->resources)
		devm_kfree(dev, win->res);
	pci_free_resource_list(&port->resources);

	return err;
}

/**
 * xilinx_pcie_parse_dt - Parse Device tree
 * @port: PCIe port information
 *
 * Return: '0' on success and error value on failure
 */
static int xilinx_pcie_parse_dt(struct xilinx_pcie_port *port)
{
	struct device *dev = port->dev;
	struct device_node *node = dev->of_node;
	struct resource regs;
	const char *type;
	int err;

	type = of_get_property(node, "device_type", NULL);
	if (!type || strcmp(type, "pci")) {
		dev_err(dev, "invalid \"device_type\" %s\n", type);
		return -EINVAL;
	}

	err = of_address_to_resource(node, 0, &regs);
	if (err) {
		dev_err(dev, "missing \"reg\" property\n");
		return err;
	}

	port->reg_base = devm_ioremap_resource(dev, &regs);
	if (IS_ERR(port->reg_base))
		return PTR_ERR(port->reg_base);

	port->irq = irq_of_parse_and_map(node, 0);
	err = devm_request_irq(dev, port->irq, xilinx_pcie_intr_handler,
			       IRQF_SHARED | IRQF_NO_THREAD,
			       "xilinx-pcie", port);
	if (err) {
		dev_err(dev, "unable to request irq %d\n", port->irq);
		return err;
	}

	return 0;
}

/**
 * xilinx_pcie_probe - Probe function
 * @pdev: Platform device pointer
 *
 * Return: '0' on success and error value on failure
 */
static int xilinx_pcie_probe(struct platform_device *pdev)
{
	struct xilinx_pcie_port *port;
	struct hw_pci hw;
	struct device *dev = &pdev->dev;
	int err;

	if (!dev->of_node)
		return -ENODEV;

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

	port->dev = dev;

	err = xilinx_pcie_parse_dt(port);
	if (err) {
		dev_err(dev, "Parsing DT failed\n");
		return err;
	}

	xilinx_pcie_init_port(port);

	err = xilinx_pcie_init_irq_domain(port);
	if (err) {
		dev_err(dev, "Failed creating IRQ Domain\n");
		return err;
	}

	/*
	 * Parse PCI ranges, configuration bus range and
	 * request their resources
	 */
	INIT_LIST_HEAD(&port->resources);
	err = xilinx_pcie_parse_and_add_res(port);
	if (err) {
		dev_err(dev, "Failed adding resources\n");
		return err;
	}

	platform_set_drvdata(pdev, port);

	/* Register the device */
	memset(&hw, 0, sizeof(hw));
	hw = (struct hw_pci) {
		.nr_controllers	= 1,
		.private_data	= (void **)&port,
		.setup		= xilinx_pcie_setup,
		.map_irq	= of_irq_parse_and_map_pci,
		.scan		= xilinx_pcie_scan_bus,
		.ops		= &xilinx_pcie_ops,
	};

#ifdef CONFIG_PCI_MSI
	xilinx_pcie_msi_chip.dev = port->dev;
#endif
	pci_common_init_dev(dev, &hw);

	return 0;
}

/**
 * xilinx_pcie_remove - Remove function
 * @pdev: Platform device pointer
 *
 * Return: '0' always
 */
static int xilinx_pcie_remove(struct platform_device *pdev)
{
	struct xilinx_pcie_port *port = platform_get_drvdata(pdev);

	xilinx_pcie_free_irq_domain(port);

	return 0;
}

static struct of_device_id xilinx_pcie_of_match[] = {
	{ .compatible = "xlnx,axi-pcie-host-1.00.a", },
	{}
};

static struct platform_driver xilinx_pcie_driver = {
	.driver = {
		.name = "xilinx-pcie",
		.of_match_table = xilinx_pcie_of_match,
		.suppress_bind_attrs = true,
	},
	.probe = xilinx_pcie_probe,
	.remove = xilinx_pcie_remove,
};
module_platform_driver(xilinx_pcie_driver);

MODULE_AUTHOR("Xilinx Inc");
MODULE_DESCRIPTION("Xilinx AXI PCIe driver");
MODULE_LICENSE("GPL v2");