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_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
  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, &reg);
  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(&reg));
  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
 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
 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 = 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");