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