1 /*
2 * Copyright (C) 2015 Broadcom Corporation
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation version 2.
7 *
8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9 * kind, whether express or implied; without even the implied warranty
10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/pci.h>
16 #include <linux/clk.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/interrupt.h>
20 #include <linux/platform_device.h>
21 #include <linux/of_address.h>
22 #include <linux/of_pci.h>
23 #include <linux/of_irq.h>
24 #include <linux/of_platform.h>
25 #include <linux/phy/phy.h>
26
27 #include "pcie-iproc.h"
28
29 static const struct of_device_id iproc_pcie_of_match_table[] = {
30 {
31 .compatible = "brcm,iproc-pcie",
32 .data = (int *)IPROC_PCIE_PAXB,
33 }, {
34 .compatible = "brcm,iproc-pcie-paxc",
35 .data = (int *)IPROC_PCIE_PAXC,
36 },
37 { /* sentinel */ }
38 };
39 MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
40
iproc_pcie_pltfm_probe(struct platform_device * pdev)41 static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
42 {
43 struct device *dev = &pdev->dev;
44 const struct of_device_id *of_id;
45 struct iproc_pcie *pcie;
46 struct device_node *np = dev->of_node;
47 struct resource reg;
48 resource_size_t iobase = 0;
49 LIST_HEAD(resources);
50 int ret;
51
52 of_id = of_match_device(iproc_pcie_of_match_table, dev);
53 if (!of_id)
54 return -EINVAL;
55
56 pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
57 if (!pcie)
58 return -ENOMEM;
59
60 pcie->dev = dev;
61 pcie->type = (enum iproc_pcie_type)of_id->data;
62
63 ret = of_address_to_resource(np, 0, ®);
64 if (ret < 0) {
65 dev_err(dev, "unable to obtain controller resources\n");
66 return ret;
67 }
68
69 pcie->base = devm_ioremap(dev, reg.start, resource_size(®));
70 if (!pcie->base) {
71 dev_err(dev, "unable to map controller registers\n");
72 return -ENOMEM;
73 }
74 pcie->base_addr = reg.start;
75
76 if (of_property_read_bool(np, "brcm,pcie-ob")) {
77 u32 val;
78
79 ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
80 &val);
81 if (ret) {
82 dev_err(dev,
83 "missing brcm,pcie-ob-axi-offset property\n");
84 return ret;
85 }
86 pcie->ob.axi_offset = val;
87
88 ret = of_property_read_u32(np, "brcm,pcie-ob-window-size",
89 &val);
90 if (ret) {
91 dev_err(dev,
92 "missing brcm,pcie-ob-window-size property\n");
93 return ret;
94 }
95 pcie->ob.window_size = (resource_size_t)val * SZ_1M;
96
97 if (of_property_read_bool(np, "brcm,pcie-ob-oarr-size"))
98 pcie->ob.set_oarr_size = true;
99
100 pcie->need_ob_cfg = true;
101 }
102
103 /* PHY use is optional */
104 pcie->phy = devm_phy_get(dev, "pcie-phy");
105 if (IS_ERR(pcie->phy)) {
106 if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
107 return -EPROBE_DEFER;
108 pcie->phy = NULL;
109 }
110
111 ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &resources,
112 &iobase);
113 if (ret) {
114 dev_err(dev, "unable to get PCI host bridge resources\n");
115 return ret;
116 }
117
118 pcie->map_irq = of_irq_parse_and_map_pci;
119
120 ret = iproc_pcie_setup(pcie, &resources);
121 if (ret) {
122 dev_err(dev, "PCIe controller setup failed\n");
123 pci_free_resource_list(&resources);
124 return ret;
125 }
126
127 platform_set_drvdata(pdev, pcie);
128 return 0;
129 }
130
iproc_pcie_pltfm_remove(struct platform_device * pdev)131 static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
132 {
133 struct iproc_pcie *pcie = platform_get_drvdata(pdev);
134
135 return iproc_pcie_remove(pcie);
136 }
137
138 static struct platform_driver iproc_pcie_pltfm_driver = {
139 .driver = {
140 .name = "iproc-pcie",
141 .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
142 },
143 .probe = iproc_pcie_pltfm_probe,
144 .remove = iproc_pcie_pltfm_remove,
145 };
146 module_platform_driver(iproc_pcie_pltfm_driver);
147
148 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
149 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
150 MODULE_LICENSE("GPL v2");
151