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_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 ret = pci_parse_request_of_pci_ranges(dev, &bridge->windows, 99 &bridge->dma_ranges, NULL); 100 if (ret) { 101 dev_err(dev, "unable to get PCI host bridge resources\n"); 102 return ret; 103 } 104 105 /* PAXC doesn't support legacy IRQs, skip mapping */ 106 switch (pcie->type) { 107 case IPROC_PCIE_PAXC: 108 case IPROC_PCIE_PAXC_V2: 109 break; 110 default: 111 pcie->map_irq = of_irq_parse_and_map_pci; 112 } 113 114 ret = iproc_pcie_setup(pcie, &bridge->windows); 115 if (ret) { 116 dev_err(dev, "PCIe controller setup failed\n"); 117 return ret; 118 } 119 120 platform_set_drvdata(pdev, pcie); 121 return 0; 122 } 123 124 static int iproc_pcie_pltfm_remove(struct platform_device *pdev) 125 { 126 struct iproc_pcie *pcie = platform_get_drvdata(pdev); 127 128 return iproc_pcie_remove(pcie); 129 } 130 131 static void iproc_pcie_pltfm_shutdown(struct platform_device *pdev) 132 { 133 struct iproc_pcie *pcie = platform_get_drvdata(pdev); 134 135 iproc_pcie_shutdown(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 .shutdown = iproc_pcie_pltfm_shutdown, 146 }; 147 module_platform_driver(iproc_pcie_pltfm_driver); 148 149 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>"); 150 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver"); 151 MODULE_LICENSE("GPL v2"); 152