drivers/pci/controller/pcie-iproc-platform.c

   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, &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         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");