/*
 * Copyright (C) 2007 Antonino Daplas <adaplas@gmail.com>
 *
 * 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/sysfb.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 = &sysfb_primary_display.screen;
        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;

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

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

                return false;
        }
#endif

        /*
         * No framebuffer was set up by the firmware/bootloader, so fall back
         * to the default VGA device.
         */
        return pdev == vga_default_device();
}
EXPORT_SYMBOL(video_is_primary_device);

MODULE_LICENSE("GPL");