video-common.c

 1/*
 2 * Copyright (C) 2007 Antonino Daplas <adaplas@gmail.com>
 3 *
 4 * This file is subject to the terms and conditions of the GNU General Public
 5 * License.  See the file COPYING in the main directory of this archive
 6 * for more details.
 7 *
 8 */
 9
10#include <linux/module.h>
11#include <linux/pci.h>
12#include <linux/screen_info.h>
13#include <linux/vgaarb.h>
14
15#include <asm/video.h>
16
17pgprot_t pgprot_framebuffer(pgprot_t prot,
18			    unsigned long vm_start, unsigned long vm_end,
19			    unsigned long offset)
20{
21	pgprot_val(prot) &= ~_PAGE_CACHE_MASK;
22	if (boot_cpu_data.x86 > 3)
23		pgprot_val(prot) |= cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);
24
25	return prot;
26}
27EXPORT_SYMBOL(pgprot_framebuffer);
28
29bool video_is_primary_device(struct device *dev)
30{
31#ifdef CONFIG_SCREEN_INFO
32	struct screen_info *si = &screen_info;
33	struct resource res[SCREEN_INFO_MAX_RESOURCES];
34	ssize_t i, numres;
35#endif
36	struct pci_dev *pdev;
37
38	if (!dev_is_pci(dev))
39		return false;
40
41	pdev = to_pci_dev(dev);
42
43	if (!pci_is_display(pdev))
44		return false;
45
46	if (pdev == vga_default_device())
47		return true;
48
49#ifdef CONFIG_SCREEN_INFO
50	numres = screen_info_resources(si, res, ARRAY_SIZE(res));
51	for (i = 0; i < numres; ++i) {
52		if (!(res[i].flags & IORESOURCE_MEM))
53			continue;
54
55		if (pci_find_resource(pdev, &res[i]))
56			return true;
57	}
58#endif
59
60	return false;
61}
62EXPORT_SYMBOL(video_is_primary_device);
63
64MODULE_LICENSE("GPL");