LXR linux/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
  29static 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};
  45MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
  46
  47static 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        /* 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 = of_pci_get_host_bridge_resources(np, 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
 130static 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
 137static struct platform_driver iproc_pcie_pltfm_driver = {
 138        .driver = {
 139                .name = "iproc-pcie",
 140                .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
 141        },
 142        .probe = iproc_pcie_pltfm_probe,
 143        .remove = iproc_pcie_pltfm_remove,
 144};
 145module_platform_driver(iproc_pcie_pltfm_driver);
 146
 147MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
 148MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
 149MODULE_LICENSE("GPL v2");
 150