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 int iproc_pcie_pltfm_probe(struct platform_device *pdev)
  30 {
  31         struct iproc_pcie *pcie;
  32         struct device_node *np = pdev->dev.of_node;
  33         struct resource reg;
  34         resource_size_t iobase = 0;
  35         LIST_HEAD(res);
  36         int ret;
  37
  38         pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie), GFP_KERNEL);
  39         if (!pcie)
  40                 return -ENOMEM;
  41
  42         pcie->dev = &pdev->dev;
  43         platform_set_drvdata(pdev, pcie);
  44
  45         ret = of_address_to_resource(np, 0, &reg);
  46         if (ret < 0) {
  47                 dev_err(pcie->dev, "unable to obtain controller resources\n");
  48                 return ret;
  49         }
  50
  51         pcie->base = devm_ioremap(pcie->dev, reg.start, resource_size(&reg));
  52         if (!pcie->base) {
  53                 dev_err(pcie->dev, "unable to map controller registers\n");
  54                 return -ENOMEM;
  55         }
  56
  57         if (of_property_read_bool(np, "brcm,pcie-ob")) {
  58                 u32 val;
  59
  60                 ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
  61                                            &val);
  62                 if (ret) {
  63                         dev_err(pcie->dev,
  64                                 "missing brcm,pcie-ob-axi-offset property\n");
  65                         return ret;
  66                 }
  67                 pcie->ob.axi_offset = val;
  68
  69                 ret = of_property_read_u32(np, "brcm,pcie-ob-window-size",
  70                                            &val);
  71                 if (ret) {
  72                         dev_err(pcie->dev,
  73                                 "missing brcm,pcie-ob-window-size property\n");
  74                         return ret;
  75                 }
  76                 pcie->ob.window_size = (resource_size_t)val * SZ_1M;
  77
  78                 if (of_property_read_bool(np, "brcm,pcie-ob-oarr-size"))
  79                         pcie->ob.set_oarr_size = true;
  80
  81                 pcie->need_ob_cfg = true;
  82         }
  83
  84         /* PHY use is optional */
  85         pcie->phy = devm_phy_get(&pdev->dev, "pcie-phy");
  86         if (IS_ERR(pcie->phy)) {
  87                 if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
  88                         return -EPROBE_DEFER;
  89                 pcie->phy = NULL;
  90         }
  91
  92         ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &iobase);
  93         if (ret) {
  94                 dev_err(pcie->dev,
  95                         "unable to get PCI host bridge resources\n");
  96                 return ret;
  97         }
  98
  99         pcie->map_irq = of_irq_parse_and_map_pci;
 100
 101         ret = iproc_pcie_setup(pcie, &res);
 102         if (ret)
 103                 dev_err(pcie->dev, "PCIe controller setup failed\n");
 104
 105         pci_free_resource_list(&res);
 106
 107         return ret;
 108 }
 109
 110 static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
 111 {
 112         struct iproc_pcie *pcie = platform_get_drvdata(pdev);
 113
 114         return iproc_pcie_remove(pcie);
 115 }
 116
 117 static const struct of_device_id iproc_pcie_of_match_table[] = {
 118         { .compatible = "brcm,iproc-pcie", },
 119         { /* sentinel */ }
 120 };
 121 MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
 122
 123 static struct platform_driver iproc_pcie_pltfm_driver = {
 124         .driver = {
 125                 .name = "iproc-pcie",
 126                 .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
 127         },
 128         .probe = iproc_pcie_pltfm_probe,
 129         .remove = iproc_pcie_pltfm_remove,
 130 };
 131 module_platform_driver(iproc_pcie_pltfm_driver);
 132
 133 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
 134 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
 135 MODULE_LICENSE("GPL v2");