summaryrefslogtreecommitdiffstats
path: root/drivers/pci/host/pcie-iproc-platform.c
blob: 8c6a327ca6cdf883f32ea9a6fa0e7e1e28ab0e98 (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
/*
 * Copyright (C) 2015 Broadcom Corporation
 *
 * 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/phy/phy.h>

#include "pcie-iproc.h"

static const struct of_device_id iproc_pcie_of_match_table[] = {
	{
		.compatible = "brcm,iproc-pcie",
		.data = (int *)IPROC_PCIE_PAXB,
	}, {
		.compatible = "brcm,iproc-pcie-paxb-v2",
		.data = (int *)IPROC_PCIE_PAXB_V2,
	}, {
		.compatible = "brcm,iproc-pcie-paxc",
		.data = (int *)IPROC_PCIE_PAXC,
	}, {
		.compatible = "brcm,iproc-pcie-paxc-v2",
		.data = (int *)IPROC_PCIE_PAXC_V2,
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);

static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct iproc_pcie *pcie;
	struct device_node *np = dev->of_node;
	struct resource reg;
	resource_size_t iobase = 0;
	LIST_HEAD(resources);
	int ret;

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

	pcie->dev = dev;
	pcie->type = (enum iproc_pcie_type) of_device_get_match_data(dev);

	ret = of_address_to_resource(np, 0, &reg);
	if (ret < 0) {
		dev_err(dev, "unable to obtain controller resources\n");
		return ret;
	}

	pcie->base = devm_ioremap(dev, reg.start, resource_size(&reg));
	if (!pcie->base) {
		dev_err(dev, "unable to map controller registers\n");
		return -ENOMEM;
	}
	pcie->base_addr = reg.start;

	if (of_property_read_bool(np, "brcm,pcie-ob")) {
		u32 val;

		ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
					   &val);
		if (ret) {
			dev_err(dev,
				"missing brcm,pcie-ob-axi-offset property\n");
			return ret;
		}
		pcie->ob.axi_offset = val;
		pcie->need_ob_cfg = true;
	}

	/* PHY use is optional */
	pcie->phy = devm_phy_get(dev, "pcie-phy");
	if (IS_ERR(pcie->phy)) {
		if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
			return -EPROBE_DEFER;
		pcie->phy = NULL;
	}

	ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &resources,
					       &iobase);
	if (ret) {
		dev_err(dev, "unable to get PCI host bridge resources\n");
		return ret;
	}

	/* PAXC doesn't support legacy IRQs, skip mapping */
	switch (pcie->type) {
	case IPROC_PCIE_PAXC:
	case IPROC_PCIE_PAXC_V2:
		break;
	default:
		pcie->map_irq = of_irq_parse_and_map_pci;
	}

	ret = iproc_pcie_setup(pcie, &resources);
	if (ret) {
		dev_err(dev, "PCIe controller setup failed\n");
		pci_free_resource_list(&resources);
		return ret;
	}

	platform_set_drvdata(pdev, pcie);
	return 0;
}

static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
{
	struct iproc_pcie *pcie = platform_get_drvdata(pdev);

	return iproc_pcie_remove(pcie);
}

static struct platform_driver iproc_pcie_pltfm_driver = {
	.driver = {
		.name = "iproc-pcie",
		.of_match_table = of_match_ptr(iproc_pcie_of_match_table),
	},
	.probe = iproc_pcie_pltfm_probe,
	.remove = iproc_pcie_pltfm_remove,
};
module_platform_driver(iproc_pcie_pltfm_driver);

MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
MODULE_LICENSE("GPL v2");