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 
40 static int iproc_pltfm_pcie_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, &reg);
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(&reg));
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 
118 static int iproc_pltfm_pcie_remove(struct platform_device *pdev)
119 {
120 	struct iproc_pcie *pcie = platform_get_drvdata(pdev);
121 
122 	return iproc_pcie_remove(pcie);
123 }
124 
125 static void iproc_pltfm_pcie_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_pltfm_pcie_driver = {
133 	.driver = {
134 		.name = "iproc-pcie",
135 		.of_match_table = of_match_ptr(iproc_pcie_of_match_table),
136 	},
137 	.probe = iproc_pltfm_pcie_probe,
138 	.remove = iproc_pltfm_pcie_remove,
139 	.shutdown = iproc_pltfm_pcie_shutdown,
140 };
141 module_platform_driver(iproc_pltfm_pcie_driver);
142 
143 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
144 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
145 MODULE_LICENSE("GPL v2");
146