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         const struct of_device_id *of_id;
  51         struct iproc_pcie *pcie;
  52         struct device_node *np = dev->of_node;
  53         struct resource reg;
  54         resource_size_t iobase = 0;
  55         LIST_HEAD(res);
  56         int ret;
  57
  58         of_id = of_match_device(iproc_pcie_of_match_table, dev);
  59         if (!of_id)
  60                 return -EINVAL;
  61
  62         pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
  63         if (!pcie)
  64                 return -ENOMEM;
  65
  66         pcie->dev = dev;
  67         pcie->type = (enum iproc_pcie_type)of_id->data;
  68
  69         ret = of_address_to_resource(np, 0, &reg);
  70         if (ret < 0) {
  71                 dev_err(dev, "unable to obtain controller resources\n");
  72                 return ret;
  73         }
  74
  75         pcie->base = devm_ioremap(dev, reg.start, resource_size(&reg));
  76         if (!pcie->base) {
  77                 dev_err(dev, "unable to map controller registers\n");
  78                 return -ENOMEM;
  79         }
  80         pcie->base_addr = reg.start;
  81
  82         if (of_property_read_bool(np, "brcm,pcie-ob")) {
  83                 u32 val;
  84
  85                 ret = of_property_read_u32(np, "brcm,pcie-ob-axi-offset",
  86                                            &val);
  87                 if (ret) {
  88                         dev_err(dev,
  89                                 "missing brcm,pcie-ob-axi-offset property\n");
  90                         return ret;
  91                 }
  92                 pcie->ob.axi_offset = val;
  93                 pcie->need_ob_cfg = true;
  94         }
  95
  96         /* PHY use is optional */
  97         pcie->phy = devm_phy_get(dev, "pcie-phy");
  98         if (IS_ERR(pcie->phy)) {
  99                 if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
 100                         return -EPROBE_DEFER;
 101                 pcie->phy = NULL;
 102         }
 103
 104         ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &iobase);
 105         if (ret) {
 106                 dev_err(dev,
 107                         "unable to get PCI host bridge resources\n");
 108                 return ret;
 109         }
 110
 111         /* PAXC doesn't support legacy IRQs, skip mapping */
 112         switch (pcie->type) {
 113         case IPROC_PCIE_PAXC:
 114         case IPROC_PCIE_PAXC_V2:
 115                 break;
 116         default:
 117                 pcie->map_irq = of_irq_parse_and_map_pci;
 118         }
 119
 120         ret = iproc_pcie_setup(pcie, &res);
 121         if (ret)
 122                 dev_err(dev, "PCIe controller setup failed\n");
 123
 124         pci_free_resource_list(&res);
 125
 126         platform_set_drvdata(pdev, pcie);
 127         return ret;
 128 }
 129
 130 static 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
 137 static 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 };
 145 module_platform_driver(iproc_pcie_pltfm_driver);
 146
 147 MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
 148 MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
 149 MODULE_LICENSE("GPL v2");