1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2015 Broadcom Corporation
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/pci.h>
8 #include <linux/clk.h>
9 #include <linux/module.h>
10 #include <linux/slab.h>
11 #include <linux/interrupt.h>
12 #include <linux/platform_device.h>
13 #include <linux/of_address.h>
14 #include <linux/of_pci.h>
15 #include <linux/of_platform.h>
16 #include <linux/phy/phy.h>
17
18 #include "../pci.h"
19 #include "pcie-iproc.h"
20
21 static const struct of_device_id iproc_pcie_of_match_table[] = {
22 {
23 .compatible = "brcm,iproc-pcie",
24 .data = (int *)IPROC_PCIE_PAXB,
25 }, {
26 .compatible = "brcm,iproc-pcie-paxb-v2",
27 .data = (int *)IPROC_PCIE_PAXB_V2,
28 }, {
29 .compatible = "brcm,iproc-pcie-paxc",
30 .data = (int *)IPROC_PCIE_PAXC,
31 }, {
32 .compatible = "brcm,iproc-pcie-paxc-v2",
33 .data = (int *)IPROC_PCIE_PAXC_V2,
34 },
35 { /* sentinel */ }
36 };
37 MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
38
iproc_pltfm_pcie_probe(struct platform_device * pdev)39 static int iproc_pltfm_pcie_probe(struct platform_device *pdev)
40 {
41 struct device *dev = &pdev->dev;
42 struct iproc_pcie *pcie;
43 struct device_node *np = dev->of_node;
44 struct resource reg;
45 struct pci_host_bridge *bridge;
46 int ret;
47
48 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
49 if (!bridge)
50 return -ENOMEM;
51
52 pcie = pci_host_bridge_priv(bridge);
53
54 pcie->dev = dev;
55 pcie->type = (uintptr_t)of_device_get_match_data(dev);
56
57 ret = of_address_to_resource(np, 0, ®);
58 if (ret < 0) {
59 dev_err(dev, "unable to obtain controller resources\n");
60 return ret;
61 }
62
63 pcie->base = devm_pci_remap_cfgspace(dev, reg.start,
64 resource_size(®));
65 if (!pcie->base) {
66 dev_err(dev, "unable to map controller registers\n");
67 return -ENOMEM;
68 }
69 pcie->base_addr = reg.start;
70
71 if (of_property_read_bool(np, "brcm,pcie-ob")) {
72 u32 val;
73
74 ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
75 &val);
76 if (ret) {
77 dev_err(dev,
78 "missing brcm,pcie-ob-axi-offset property\n");
79 return ret;
80 }
81 pcie->ob.axi_offset = val;
82 pcie->need_ob_cfg = true;
83 }
84
85 /*
86 * DT nodes are not used by all platforms that use the iProc PCIe
87 * core driver. For platforms that require explicit inbound mapping
88 * configuration, "dma-ranges" would have been present in DT
89 */
90 pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges");
91
92 /* PHY use is optional */
93 pcie->phy = devm_phy_optional_get(dev, "pcie-phy");
94 if (IS_ERR(pcie->phy))
95 return PTR_ERR(pcie->phy);
96
97 /* PAXC doesn't support legacy IRQs, skip mapping */
98 switch (pcie->type) {
99 case IPROC_PCIE_PAXC:
100 case IPROC_PCIE_PAXC_V2:
101 pcie->map_irq = NULL;
102 break;
103 default:
104 break;
105 }
106
107 ret = iproc_pcie_setup(pcie, &bridge->windows);
108 if (ret) {
109 dev_err(dev, "PCIe controller setup failed\n");
110 return ret;
111 }
112
113 platform_set_drvdata(pdev, pcie);
114 return 0;
115 }
116
iproc_pltfm_pcie_remove(struct platform_device * pdev)117 static void iproc_pltfm_pcie_remove(struct platform_device *pdev)
118 {
119 struct iproc_pcie *pcie = platform_get_drvdata(pdev);
120
121 iproc_pcie_remove(pcie);
122 }
123
iproc_pltfm_pcie_shutdown(struct platform_device * pdev)124 static void iproc_pltfm_pcie_shutdown(struct platform_device *pdev)
125 {
126 struct iproc_pcie *pcie = platform_get_drvdata(pdev);
127
128 iproc_pcie_shutdown(pcie);
129 }
130
131 static struct platform_driver iproc_pltfm_pcie_driver = {
132 .driver = {
133 .name = "iproc-pcie",
134 .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
135 },
136 .probe = iproc_pltfm_pcie_probe,
137 .remove_new = iproc_pltfm_pcie_remove,
138 .shutdown = iproc_pltfm_pcie_shutdown,
139 };
140 module_platform_driver(iproc_pltfm_pcie_driver);
141
142 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
143 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
144 MODULE_LICENSE("GPL v2");
145