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-paxc",
  35                 .data = (int *)IPROC_PCIE_PAXC,
  36         },
  37         { /* sentinel */ }
  38 };
  39 MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
  40
  41 static 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
 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 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 };
 144 module_platform_driver(iproc_pcie_pltfm_driver);
 145
 146 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
 147 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
 148 MODULE_LICENSE("GPL v2");