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         resource_size_t iobase = 0;
  47         LIST_HEAD(resources);
  48         struct pci_host_bridge *bridge;
  49         int ret;
  50
  51         bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
  52         if (!bridge)
  53                 return -ENOMEM;
  54
  55         pcie = pci_host_bridge_priv(bridge);
  56
  57         pcie->dev = dev;
  58         pcie->type = (enum iproc_pcie_type) of_device_get_match_data(dev);
  59
  60         ret = of_address_to_resource(np, 0, &reg);
  61         if (ret < 0) {
  62                 dev_err(dev, "unable to obtain controller resources\n");
  63                 return ret;
  64         }
  65
  66         pcie->base = devm_pci_remap_cfgspace(dev, reg.start,
  67                                              resource_size(&reg));
  68         if (!pcie->base) {
  69                 dev_err(dev, "unable to map controller registers\n");
  70                 return -ENOMEM;
  71         }
  72         pcie->base_addr = reg.start;
  73
  74         if (of_property_read_bool(np, "brcm,pcie-ob")) {
  75                 u32 val;
  76
  77                 ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
  78                                            &val);
  79                 if (ret) {
  80                         dev_err(dev,
  81                                 "missing brcm,pcie-ob-axi-offset property\n");
  82                         return ret;
  83                 }
  84                 pcie->ob.axi_offset = val;
  85                 pcie->need_ob_cfg = true;
  86         }
  87
  88         /*
  89          * DT nodes are not used by all platforms that use the iProc PCIe
  90          * core driver. For platforms that require explict inbound mapping
  91          * configuration, "dma-ranges" would have been present in DT
  92          */
  93         pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges");
  94
  95         /* PHY use is optional */
  96         pcie->phy = devm_phy_get(dev, "pcie-phy");
  97         if (IS_ERR(pcie->phy)) {
  98                 if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
  99                         return -EPROBE_DEFER;
 100                 pcie->phy = NULL;
 101         }
 102
 103         ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &resources,
 104                                                     &iobase);
 105         if (ret) {
 106                 dev_err(dev, "unable to get PCI host bridge resources\n");
 107                 return ret;
 108         }
 109
 110         /* PAXC doesn't support legacy IRQs, skip mapping */
 111         switch (pcie->type) {
 112         case IPROC_PCIE_PAXC:
 113         case IPROC_PCIE_PAXC_V2:
 114                 break;
 115         default:
 116                 pcie->map_irq = of_irq_parse_and_map_pci;
 117         }
 118
 119         ret = iproc_pcie_setup(pcie, &resources);
 120         if (ret) {
 121                 dev_err(dev, "PCIe controller setup failed\n");
 122                 pci_free_resource_list(&resources);
 123                 return ret;
 124         }
 125
 126         platform_set_drvdata(pdev, pcie);
 127         return 0;
 128 }
 129
 130 static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
 131 {
 132         struct iproc_pcie *pcie = platform_get_drvdata(pdev);
 133
 134         return iproc_pcie_remove(pcie);
 135 }
 136
 137 static void iproc_pcie_pltfm_shutdown(struct platform_device *pdev)
 138 {
 139         struct iproc_pcie *pcie = platform_get_drvdata(pdev);
 140
 141         iproc_pcie_shutdown(pcie);
 142 }
 143
 144 static struct platform_driver iproc_pcie_pltfm_driver = {
 145         .driver = {
 146                 .name = "iproc-pcie",
 147                 .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
 148         },
 149         .probe = iproc_pcie_pltfm_probe,
 150         .remove = iproc_pcie_pltfm_remove,
 151         .shutdown = iproc_pcie_pltfm_shutdown,
 152 };
 153 module_platform_driver(iproc_pcie_pltfm_driver);
 154
 155 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
 156 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
 157 MODULE_LICENSE("GPL v2");