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
  42 static unsigned long platform_mmio;
  43 static unsigned long platform_mmio_alloc;
  44 static unsigned long platform_mmiolen;
  45
  46 static 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
  57 static 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;
 105 grant_out:
 106         gnttab_free_auto_xlat_frames();
 107 out:
 108         pci_release_region(pdev, 0);
 109 mem_out:
 110         pci_release_region(pdev, 1);
 111 pci_out:
 112         pci_disable_device(pdev);
 113         return ret;
 114 }
 115
 116 static 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
 122 static struct pci_driver platform_driver = {
 123         .name =           DRV_NAME,
 124         .probe =          platform_pci_probe,
 125         .id_table =       platform_pci_tbl,
 126 };
 127
 128 builtin_pci_driver(platform_driver);