LXR linux/drivers/xen/platform-pci.c

   1/******************************************************************************
   2 * platform-pci.c
   3 *
   4 * Xen platform PCI device driver
   5 *
   6 * Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com
   7 *
   8 * Copyright (c) 2005, Intel Corporation.
   9 * Copyright (c) 2007, XenSource Inc.
  10 * Copyright (c) 2010, Citrix
  11 *
  12 * This program is free software; you can redistribute it and/or modify it
  13 * under the terms and conditions of the GNU General Public License,
  14 * version 2, as published by the Free Software Foundation.
  15 *
  16 * This program is distributed in the hope it will be useful, but WITHOUT
  17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  19 * more details.
  20 *
  21 * You should have received a copy of the GNU General Public License along with
  22 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  23 * Place - Suite 330, Boston, MA 02111-1307 USA.
  24 *
  25 */
  26
  27
  28#include <linux/interrupt.h>
  29#include <linux/io.h>
  30#include <linux/init.h>
  31#include <linux/pci.h>
  32
  33#include <xen/platform_pci.h>
  34#include <xen/grant_table.h>
  35#include <xen/xenbus.h>
  36#include <xen/events.h>
  37#include <xen/hvm.h>
  38#include <xen/xen-ops.h>
  39
  40#define DRV_NAME    "xen-platform-pci"
  41
  42static unsigned long platform_mmio;
  43static unsigned long platform_mmio_alloc;
  44static unsigned long platform_mmiolen;
  45
  46static unsigned long alloc_xen_mmio(unsigned long len)
  47{
  48        unsigned long addr;
  49
  50        addr = platform_mmio + platform_mmio_alloc;
  51        platform_mmio_alloc += len;
  52        BUG_ON(platform_mmio_alloc > platform_mmiolen);
  53
  54        return addr;
  55}
  56
  57static int platform_pci_probe(struct pci_dev *pdev,
  58                              const struct pci_device_id *ent)
  59{
  60        int i, ret;
  61        long ioaddr;
  62        long mmio_addr, mmio_len;
  63        unsigned int max_nr_gframes;
  64        unsigned long grant_frames;
  65
  66        if (!xen_domain())
  67                return -ENODEV;
  68
  69        i = pci_enable_device(pdev);
  70        if (i)
  71                return i;
  72
  73        ioaddr = pci_resource_start(pdev, 0);
  74
  75        mmio_addr = pci_resource_start(pdev, 1);
  76        mmio_len = pci_resource_len(pdev, 1);
  77
  78        if (mmio_addr == 0 || ioaddr == 0) {
  79                dev_err(&pdev->dev, "no resources found\n");
  80                ret = -ENOENT;
  81                goto pci_out;
  82        }
  83
  84        ret = pci_request_region(pdev, 1, DRV_NAME);
  85        if (ret < 0)
  86                goto pci_out;
  87
  88        ret = pci_request_region(pdev, 0, DRV_NAME);
  89        if (ret < 0)
  90                goto mem_out;
  91
  92        platform_mmio = mmio_addr;
  93        platform_mmiolen = mmio_len;
  94
  95        max_nr_gframes = gnttab_max_grant_frames();
  96        grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
  97        ret = gnttab_setup_auto_xlat_frames(grant_frames);
  98        if (ret)
  99                goto out;
 100        ret = gnttab_init();
 101        if (ret)
 102                goto grant_out;
 103        xenbus_probe(NULL);
 104        return 0;
 105grant_out:
 106        gnttab_free_auto_xlat_frames();
 107out:
 108        pci_release_region(pdev, 0);
 109mem_out:
 110        pci_release_region(pdev, 1);
 111pci_out:
 112        pci_disable_device(pdev);
 113        return ret;
 114}
 115
 116static struct pci_device_id platform_pci_tbl[] = {
 117        {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
 118                PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 119        {0,}
 120};
 121
 122static struct pci_driver platform_driver = {
 123        .name =           DRV_NAME,
 124        .probe =          platform_pci_probe,
 125        .id_table =       platform_pci_tbl,
 126};
 127
 128static int __init platform_pci_init(void)
 129{
 130        return pci_register_driver(&platform_driver);
 131}
 132device_initcall(platform_pci_init);
 133