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_irq.h>
16 #include <linux/of_platform.h>
17 #include <linux/phy/phy.h>
18
19 #include "../pci.h"
20 #include "pcie-iproc.h"
21
22 static const struct of_device_id iproc_pcie_of_match_table[] = {
23 {
24 .compatible = "brcm,iproc-pcie",
25 .data = (int *)IPROC_PCIE_PAXB,
26 }, {
27 .compatible = "brcm,iproc-pcie-paxb-v2",
28 .data = (int *)IPROC_PCIE_PAXB_V2,
29 }, {
30 .compatible = "brcm,iproc-pcie-paxc",
31 .data = (int *)IPROC_PCIE_PAXC,
32 }, {
33 .compatible = "brcm,iproc-pcie-paxc-v2",
34 .data = (int *)IPROC_PCIE_PAXC_V2,
35 },
36 { /* sentinel */ }
37 };
38 MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
39
iproc_pcie_pltfm_probe(struct platform_device * pdev)40 static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
41 {
42 struct device *dev = &pdev->dev;
43 struct iproc_pcie *pcie;
44 struct device_node *np = dev->of_node;
45 struct resource reg;
46 struct pci_host_bridge *bridge;
47 int ret;
48
49 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
50 if (!bridge)
51 return -ENOMEM;
52
53 pcie = pci_host_bridge_priv(bridge);
54
55 pcie->dev = dev;
56 pcie->type = (enum iproc_pcie_type) of_device_get_match_data(dev);
57
58 ret = of_address_to_resource(np, 0, ®);
59 if (ret < 0) {
60 dev_err(dev, "unable to obtain controller resources\n");
61 return ret;
62 }
63
64 pcie->base = devm_pci_remap_cfgspace(dev, reg.start,
65 resource_size(®));
66 if (!pcie->base) {
67 dev_err(dev, "unable to map controller registers\n");
68 return -ENOMEM;
69 }
70 pcie->base_addr = reg.start;
71
72 if (of_property_read_bool(np, "brcm,pcie-ob")) {
73 u32 val;
74
75 ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
76 &val);
77 if (ret) {
78 dev_err(dev,
79 "missing brcm,pcie-ob-axi-offset property\n");
80 return ret;
81 }
82 pcie->ob.axi_offset = val;
83 pcie->need_ob_cfg = true;
84 }
85
86 /*
87 * DT nodes are not used by all platforms that use the iProc PCIe
88 * core driver. For platforms that require explicit inbound mapping
89 * configuration, "dma-ranges" would have been present in DT
90 */
91 pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges");
92
93 /* PHY use is optional */
94 pcie->phy = devm_phy_optional_get(dev, "pcie-phy");
95 if (IS_ERR(pcie->phy))
96 return PTR_ERR(pcie->phy);
97
98 /* PAXC doesn't support legacy IRQs, skip mapping */
99 switch (pcie->type) {
100 case IPROC_PCIE_PAXC:
101 case IPROC_PCIE_PAXC_V2:
102 pcie->map_irq = NULL;
103 break;
104 default:
105 break;
106 }
107
108 ret = iproc_pcie_setup(pcie, &bridge->windows);
109 if (ret) {
110 dev_err(dev, "PCIe controller setup failed\n");
111 return ret;
112 }
113
114 platform_set_drvdata(pdev, pcie);
115 return 0;
116 }
117
iproc_pcie_pltfm_remove(struct platform_device * pdev)118 static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
119 {
120 struct iproc_pcie *pcie = platform_get_drvdata(pdev);
121
122 return iproc_pcie_remove(pcie);
123 }
124
iproc_pcie_pltfm_shutdown(struct platform_device * pdev)125 static void iproc_pcie_pltfm_shutdown(struct platform_device *pdev)
126 {
127 struct iproc_pcie *pcie = platform_get_drvdata(pdev);
128
129 iproc_pcie_shutdown(pcie);
130 }
131
132 static struct platform_driver iproc_pcie_pltfm_driver = {
133 .driver = {
134 .name = "iproc-pcie",
135 .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
136 },
137 .probe = iproc_pcie_pltfm_probe,
138 .remove = iproc_pcie_pltfm_remove,
139 .shutdown = iproc_pcie_pltfm_shutdown,
140 };
141 module_platform_driver(iproc_pcie_pltfm_driver);
142
143 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
144 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
145 MODULE_LICENSE("GPL v2");
146