tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * PCIe RC driver for Synopsys DesignWare Core
3 *
4 * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com)
5 *
6 * Authors: Joao Pinto <Joao.Pinto@synopsys.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/clk.h>
13#include <linux/delay.h>
14#include <linux/gpio.h>
15#include <linux/interrupt.h>
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/of_gpio.h>
19#include <linux/pci.h>
20#include <linux/platform_device.h>
21#include <linux/resource.h>
22#include <linux/signal.h>
23#include <linux/types.h>
24
25#include "pcie-designware.h"
26
27struct dw_plat_pcie {
28 struct dw_pcie *pci;
29};
30
31static irqreturn_t dw_plat_pcie_msi_irq_handler(int irq, void *arg)
32{
33 struct pcie_port *pp = arg;
34
35 return dw_handle_msi_irq(pp);
36}
37
38static void dw_plat_pcie_host_init(struct pcie_port *pp)
39{
40 struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
41
42 dw_pcie_setup_rc(pp);
43 dw_pcie_wait_for_link(pci);
44
45 if (IS_ENABLED(CONFIG_PCI_MSI))
46 dw_pcie_msi_init(pp);
47}
48
49static struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
50 .host_init = dw_plat_pcie_host_init,
51};
52
53static int dw_plat_add_pcie_port(struct pcie_port *pp,
54 struct platform_device *pdev)
55{
56 struct device *dev = &pdev->dev;
57 int ret;
58
59 pp->irq = platform_get_irq(pdev, 1);
60 if (pp->irq < 0)
61 return pp->irq;
62
63 if (IS_ENABLED(CONFIG_PCI_MSI)) {
64 pp->msi_irq = platform_get_irq(pdev, 0);
65 if (pp->msi_irq < 0)
66 return pp->msi_irq;
67
68 ret = devm_request_irq(dev, pp->msi_irq,
69 dw_plat_pcie_msi_irq_handler,
70 IRQF_SHARED, "dw-plat-pcie-msi", pp);
71 if (ret) {
72 dev_err(dev, "failed to request MSI IRQ\n");
73 return ret;
74 }
75 }
76
77 pp->root_bus_nr = -1;
78 pp->ops = &dw_plat_pcie_host_ops;
79
80 ret = dw_pcie_host_init(pp);
81 if (ret) {
82 dev_err(dev, "failed to initialize host\n");
83 return ret;
84 }
85
86 return 0;
87}
88
89static const struct dw_pcie_ops dw_pcie_ops = {
90};
91
92static int dw_plat_pcie_probe(struct platform_device *pdev)
93{
94 struct device *dev = &pdev->dev;
95 struct dw_plat_pcie *dw_plat_pcie;
96 struct dw_pcie *pci;
97 struct resource *res; /* Resource from DT */
98 int ret;
99
100 dw_plat_pcie = devm_kzalloc(dev, sizeof(*dw_plat_pcie), GFP_KERNEL);
101 if (!dw_plat_pcie)
102 return -ENOMEM;
103
104 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
105 if (!pci)
106 return -ENOMEM;
107
108 pci->dev = dev;
109 pci->ops = &dw_pcie_ops;
110
111 dw_plat_pcie->pci = pci;
112
113 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
114 pci->dbi_base = devm_ioremap_resource(dev, res);
115 if (IS_ERR(pci->dbi_base))
116 return PTR_ERR(pci->dbi_base);
117
118 platform_set_drvdata(pdev, dw_plat_pcie);
119
120 ret = dw_plat_add_pcie_port(&pci->pp, pdev);
121 if (ret < 0)
122 return ret;
123
124 return 0;
125}
126
127static const struct of_device_id dw_plat_pcie_of_match[] = {
128 { .compatible = "snps,dw-pcie", },
129 {},
130};
131
132static struct platform_driver dw_plat_pcie_driver = {
133 .driver = {
134 .name = "dw-pcie",
135 .of_match_table = dw_plat_pcie_of_match,
136 .suppress_bind_attrs = true,
137 },
138 .probe = dw_plat_pcie_probe,
139};
140builtin_platform_driver(dw_plat_pcie_driver);