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-paxc",
  35                .data = (int *)IPROC_PCIE_PAXC,
  36        },
  37        { /* sentinel */ }
  38};
  39MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
  40
  41static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
  42{
  43        const struct of_device_id *of_id;
  44        struct iproc_pcie *pcie;
  45        struct device_node *np = pdev->dev.of_node;
  46        struct resource reg;
  47        resource_size_t iobase = 0;
  48        LIST_HEAD(res);
  49        int ret;
  50
  51        of_id = of_match_device(iproc_pcie_of_match_table, &pdev->dev);
  52        if (!of_id)
  53                return -EINVAL;
  54
  55        pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie), GFP_KERNEL);
  56        if (!pcie)
  57                return -ENOMEM;
  58
  59        pcie->dev = &pdev->dev;
  60        pcie->type = (enum iproc_pcie_type)of_id->data;
  61        platform_set_drvdata(pdev, pcie);
  62
  63        ret = of_address_to_resource(np, 0, &reg);
  64        if (ret < 0) {
  65                dev_err(pcie->dev, "unable to obtain controller resources\n");
  66                return ret;
  67        }
  68
  69        pcie->base = devm_ioremap(pcie->dev, reg.start, resource_size(&reg));
  70        if (!pcie->base) {
  71                dev_err(pcie->dev, "unable to map controller registers\n");
  72                return -ENOMEM;
  73        }
  74        pcie->base_addr = reg.start;
  75
  76        if (of_property_read_bool(np, "brcm,pcie-ob")) {
  77                u32 val;
  78
  79                ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
  80                                           &val);
  81                if (ret) {
  82                        dev_err(pcie->dev,
  83                                "missing brcm,pcie-ob-axi-offset property\n");
  84                        return ret;
  85                }
  86                pcie->ob.axi_offset = val;
  87
  88                ret = of_property_read_u32(np, "brcm,pcie-ob-window-size",
  89                                           &val);
  90                if (ret) {
  91                        dev_err(pcie->dev,
  92                                "missing brcm,pcie-ob-window-size property\n");
  93                        return ret;
  94                }
  95                pcie->ob.window_size = (resource_size_t)val * SZ_1M;
  96
  97                if (of_property_read_bool(np, "brcm,pcie-ob-oarr-size"))
  98                        pcie->ob.set_oarr_size = true;
  99
 100                pcie->need_ob_cfg = true;
 101        }
 102
 103        /* PHY use is optional */
 104        pcie->phy = devm_phy_get(&pdev->dev, "pcie-phy");
 105        if (IS_ERR(pcie->phy)) {
 106                if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
 107                        return -EPROBE_DEFER;
 108                pcie->phy = NULL;
 109        }
 110
 111        ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &iobase);
 112        if (ret) {
 113                dev_err(pcie->dev,
 114                        "unable to get PCI host bridge resources\n");
 115                return ret;
 116        }
 117
 118        pcie->map_irq = of_irq_parse_and_map_pci;
 119
 120        ret = iproc_pcie_setup(pcie, &res);
 121        if (ret)
 122                dev_err(pcie->dev, "PCIe controller setup failed\n");
 123
 124        pci_free_resource_list(&res);
 125
 126        return ret;
 127}
 128
 129static 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
 136static struct platform_driver iproc_pcie_pltfm_driver = {
 137        .driver = {
 138                .name = "iproc-pcie",
 139                .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
 140        },
 141        .probe = iproc_pcie_pltfm_probe,
 142        .remove = iproc_pcie_pltfm_remove,
 143};
 144module_platform_driver(iproc_pcie_pltfm_driver);
 145
 146MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
 147MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
 148MODULE_LICENSE("GPL v2");
 149