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         int num_cells;
  39         unsigned long flags;
  40
  41         priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
  42         if (!priv)
  43                 return -ENOMEM;
  44
  45         ret = pci_enable_device(pdev);
  46         if (ret) {
  47                 dev_err(&pdev->dev, "Failed to enable PCI device\n");
  48                 return -ENODEV;
  49         }
  50
  51         priv->mapbase = pci_resource_start(pdev, 0);
  52         if (!priv->mapbase) {
  53                 dev_err(&pdev->dev, "No PCI resource\n");
  54                 goto out_disable;
  55         }
  56
  57         res = request_mem_region(priv->mapbase, CHAM_HEADER_SIZE,
  58                                  KBUILD_MODNAME);
  59         if (!res) {
  60                 dev_err(&pdev->dev, "Failed to request PCI memory\n");
  61                 ret = -EBUSY;
  62                 goto out_disable;
  63         }
  64
  65         priv->base = ioremap(priv->mapbase, CHAM_HEADER_SIZE);
  66         if (!priv->base) {
  67                 dev_err(&pdev->dev, "Cannot ioremap\n");
  68                 ret = -ENOMEM;
  69                 goto out_release;
  70         }
  71
  72         flags = pci_resource_flags(pdev, 0);
  73         if (flags & IORESOURCE_IO) {
  74                 ret = -ENOTSUPP;
  75                 dev_err(&pdev->dev,
  76                         "IO mapped PCI devices are not supported\n");
  77                 goto out_release;
  78         }
  79
  80         pci_set_drvdata(pdev, priv);
  81
  82         priv->bus = mcb_alloc_bus(&pdev->dev);
  83         if (IS_ERR(priv->bus)) {
  84                 ret = PTR_ERR(priv->bus);
  85                 goto out_iounmap;
  86         }
  87
  88         priv->bus->get_irq = mcb_pci_get_irq;
  89
  90         ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
  91         if (ret < 0)
  92                 goto out_iounmap;
  93         num_cells = ret;
  94
  95         dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);
  96
  97         mcb_bus_add_devices(priv->bus);
  98
  99         return 0;
 100
 101 out_iounmap:
 102         iounmap(priv->base);
 103 out_release:
 104         pci_release_region(pdev, 0);
 105 out_disable:
 106         pci_disable_device(pdev);
 107         return ret;
 108 }
 109
 110 static void mcb_pci_remove(struct pci_dev *pdev)
 111 {
 112         struct priv *priv = pci_get_drvdata(pdev);
 113
 114         mcb_release_bus(priv->bus);
 115
 116         iounmap(priv->base);
 117         release_region(priv->mapbase, CHAM_HEADER_SIZE);
 118         pci_disable_device(pdev);
 119 }
 120
 121 static const struct pci_device_id mcb_pci_tbl[] = {
 122         { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
 123         { 0 },
 124 };
 125 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
 126
 127 static struct pci_driver mcb_pci_driver = {
 128         .name = "mcb-pci",
 129         .id_table = mcb_pci_tbl,
 130         .probe = mcb_pci_probe,
 131         .remove = mcb_pci_remove,
 132 };
 133
 134 module_pci_driver(mcb_pci_driver);
 135
 136 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
 137 MODULE_LICENSE("GPL");
 138 MODULE_DESCRIPTION("MCB over PCI support");