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

   1 /*
   2  * Copyright (C) 2015 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation version 2.
   7  *
   8  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
   9  * kind, whether express or implied; without even the implied warranty
  10  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/clk.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/of_address.h>
  22 #include <linux/of_pci.h>
  23 #include <linux/of_irq.h>
  24 #include <linux/of_platform.h>
  25 #include <linux/phy/phy.h>
  26
  27 #include "pcie-iproc.h"
  28
  29 static const struct of_device_id iproc_pcie_of_match_table[] = {
  30         {
  31                 .compatible = "brcm,iproc-pcie",
  32                 .data = (int *)IPROC_PCIE_PAXB,
  33         }, {
  34                 .compatible = "brcm,iproc-pcie-paxb-v2",
  35                 .data = (int *)IPROC_PCIE_PAXB_V2,
  36         }, {
  37                 .compatible = "brcm,iproc-pcie-paxc",
  38                 .data = (int *)IPROC_PCIE_PAXC,
  39         }, {
  40                 .compatible = "brcm,iproc-pcie-paxc-v2",
  41                 .data = (int *)IPROC_PCIE_PAXC_V2,
  42         },
  43         { /* sentinel */ }
  44 };
  45 MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
  46
  47 static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
  48 {
  49         struct device *dev = &pdev->dev;
  50         struct iproc_pcie *pcie;
  51         struct device_node *np = dev->of_node;
  52         struct resource reg;
  53         resource_size_t iobase = 0;
  54         LIST_HEAD(resources);
  55         struct pci_host_bridge *bridge;
  56         int ret;
  57
  58         bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
  59         if (!bridge)
  60                 return -ENOMEM;
  61
  62         pcie = pci_host_bridge_priv(bridge);
  63
  64         pcie->dev = dev;
  65         pcie->type = (enum iproc_pcie_type) of_device_get_match_data(dev);
  66
  67         ret = of_address_to_resource(np, 0, &reg);
  68         if (ret < 0) {
  69                 dev_err(dev, "unable to obtain controller resources\n");
  70                 return ret;
  71         }
  72
  73         pcie->base = devm_pci_remap_cfgspace(dev, reg.start,
  74                                              resource_size(&reg));
  75         if (!pcie->base) {
  76                 dev_err(dev, "unable to map controller registers\n");
  77                 return -ENOMEM;
  78         }
  79         pcie->base_addr = reg.start;
  80
  81         if (of_property_read_bool(np, "brcm,pcie-ob")) {
  82                 u32 val;
  83
  84                 ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
  85                                            &val);
  86                 if (ret) {
  87                         dev_err(dev,
  88                                 "missing brcm,pcie-ob-axi-offset property\n");
  89                         return ret;
  90                 }
  91                 pcie->ob.axi_offset = val;
  92                 pcie->need_ob_cfg = true;
  93         }
  94
  95         /*
  96          * DT nodes are not used by all platforms that use the iProc PCIe
  97          * core driver. For platforms that require explict inbound mapping
  98          * configuration, "dma-ranges" would have been present in DT
  99          */
 100         pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges");
 101
 102         /* PHY use is optional */
 103         pcie->phy = devm_phy_get(dev, "pcie-phy");
 104         if (IS_ERR(pcie->phy)) {
 105                 if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
 106                         return -EPROBE_DEFER;
 107                 pcie->phy = NULL;
 108         }
 109
 110         ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &resources,
 111                                                &iobase);
 112         if (ret) {
 113                 dev_err(dev, "unable to get PCI host bridge resources\n");
 114                 return ret;
 115         }
 116
 117         /* PAXC doesn't support legacy IRQs, skip mapping */
 118         switch (pcie->type) {
 119         case IPROC_PCIE_PAXC:
 120         case IPROC_PCIE_PAXC_V2:
 121                 break;
 122         default:
 123                 pcie->map_irq = of_irq_parse_and_map_pci;
 124         }
 125
 126         ret = iproc_pcie_setup(pcie, &resources);
 127         if (ret) {
 128                 dev_err(dev, "PCIe controller setup failed\n");
 129                 pci_free_resource_list(&resources);
 130                 return ret;
 131         }
 132
 133         platform_set_drvdata(pdev, pcie);
 134         return 0;
 135 }
 136
 137 static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
 138 {
 139         struct iproc_pcie *pcie = platform_get_drvdata(pdev);
 140
 141         return iproc_pcie_remove(pcie);
 142 }
 143
 144 static void iproc_pcie_pltfm_shutdown(struct platform_device *pdev)
 145 {
 146         struct iproc_pcie *pcie = platform_get_drvdata(pdev);
 147
 148         iproc_pcie_shutdown(pcie);
 149 }
 150
 151 static struct platform_driver iproc_pcie_pltfm_driver = {
 152         .driver = {
 153                 .name = "iproc-pcie",
 154                 .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
 155         },
 156         .probe = iproc_pcie_pltfm_probe,
 157         .remove = iproc_pcie_pltfm_remove,
 158         .shutdown = iproc_pcie_pltfm_shutdown,
 159 };
 160 module_platform_driver(iproc_pcie_pltfm_driver);
 161
 162 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
 163 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
 164 MODULE_LICENSE("GPL v2");