drivers/mcb/mcb-pci.c

   1 /*
   2  * MEN Chameleon Bus.
   3  *
   4  * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
   5  * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; version 2 of the License.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/pci.h>
  14 #include <linux/mcb.h>
  15
  16 #include "mcb-internal.h"
  17
  18 struct priv {
  19         struct mcb_bus *bus;
  20         phys_addr_t mapbase;
  21         void __iomem *base;
  22 };
  23
  24 static int mcb_pci_get_irq(struct mcb_device *mdev)
  25 {
  26         struct mcb_bus *mbus = mdev->bus;
  27         struct device *dev = mbus->carrier;
  28         struct pci_dev *pdev = to_pci_dev(dev);
  29
  30         return pdev->irq;
  31 }
  32
  33 static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  34 {
  35         struct resource *res;
  36         struct priv *priv;
  37         int ret;
  38         unsigned long flags;
  39
  40         priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
  41         if (!priv)
  42                 return -ENOMEM;
  43
  44         ret = pci_enable_device(pdev);
  45         if (ret) {
  46                 dev_err(&pdev->dev, "Failed to enable PCI device\n");
  47                 return -ENODEV;
  48         }
  49
  50         priv->mapbase = pci_resource_start(pdev, 0);
  51         if (!priv->mapbase) {
  52                 dev_err(&pdev->dev, "No PCI resource\n");
  53                 ret = -ENODEV;
  54                 goto out_disable;
  55         }
  56
  57         res = devm_request_mem_region(&pdev->dev, priv->mapbase,
  58                                       CHAM_HEADER_SIZE,
  59                                       KBUILD_MODNAME);
  60         if (!res) {
  61                 dev_err(&pdev->dev, "Failed to request PCI memory\n");
  62                 ret = -EBUSY;
  63                 goto out_disable;
  64         }
  65
  66         priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
  67         if (!priv->base) {
  68                 dev_err(&pdev->dev, "Cannot ioremap\n");
  69                 ret = -ENOMEM;
  70                 goto out_disable;
  71         }
  72
  73         flags = pci_resource_flags(pdev, 0);
  74         if (flags & IORESOURCE_IO) {
  75                 ret = -ENOTSUPP;
  76                 dev_err(&pdev->dev,
  77                         "IO mapped PCI devices are not supported\n");
  78                 goto out_disable;
  79         }
  80
  81         pci_set_drvdata(pdev, priv);
  82
  83         priv->bus = mcb_alloc_bus(&pdev->dev);
  84         if (IS_ERR(priv->bus)) {
  85                 ret = PTR_ERR(priv->bus);
  86                 goto out_disable;
  87         }
  88
  89         priv->bus->get_irq = mcb_pci_get_irq;
  90
  91         ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
  92         if (ret < 0)
  93                 goto out_mcb_bus;
  94
  95         dev_dbg(&pdev->dev, "Found %d cells\n", ret);
  96
  97         mcb_bus_add_devices(priv->bus);
  98
  99         return 0;
 100
 101 out_mcb_bus:
 102         mcb_release_bus(priv->bus);
 103 out_disable:
 104         pci_disable_device(pdev);
 105         return ret;
 106 }
 107
 108 static void mcb_pci_remove(struct pci_dev *pdev)
 109 {
 110         struct priv *priv = pci_get_drvdata(pdev);
 111
 112         mcb_release_bus(priv->bus);
 113
 114         pci_disable_device(pdev);
 115 }
 116
 117 static const struct pci_device_id mcb_pci_tbl[] = {
 118         { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
 119         { 0 },
 120 };
 121 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
 122
 123 static struct pci_driver mcb_pci_driver = {
 124         .name = "mcb-pci",
 125         .id_table = mcb_pci_tbl,
 126         .probe = mcb_pci_probe,
 127         .remove = mcb_pci_remove,
 128 };
 129
 130 module_pci_driver(mcb_pci_driver);
 131
 132 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
 133 MODULE_LICENSE("GPL");
 134 MODULE_DESCRIPTION("MCB over PCI support");