video-common.c

/*
 * Copyright (C) 2007 Antonino Daplas <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/screen_info.h>
#include <linux/vgaarb.h>

#include <asm/video.h>

pgprot_t pgprot_framebuffer(pgprot_t prot,
			    unsigned long vm_start, unsigned long vm_end,
			    unsigned long offset)
{
	pgprot_val(prot) &= ~_PAGE_CACHE_MASK;
	if (boot_cpu_data.x86 > 3)
		pgprot_val(prot) |= cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);

	return prot;
}
EXPORT_SYMBOL(pgprot_framebuffer);

bool video_is_primary_device(struct device *dev)
{
#ifdef CONFIG_SCREEN_INFO
	struct screen_info *si = &screen_info;
	struct resource res[SCREEN_INFO_MAX_RESOURCES];
	ssize_t i, numres;
#endif
	struct pci_dev *pdev;

	if (!dev_is_pci(dev))
		return false;

	pdev = to_pci_dev(dev);

	if (!pci_is_display(pdev))
		return false;

	if (pdev == vga_default_device())
		return true;

#ifdef CONFIG_SCREEN_INFO
	numres = screen_info_resources(si, res, ARRAY_SIZE(res));
	for (i = 0; i < numres; ++i) {
		if (!(res[i].flags & IORESOURCE_MEM))
			continue;

		if (pci_find_resource(pdev, &res[i]))
			return true;
	}
#endif

	return false;
}
EXPORT_SYMBOL(video_is_primary_device);

MODULE_LICENSE("GPL");