cirrus_drv.c

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/*
 * Copyright 2012 Red Hat <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License version 2. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * Authors: Matthew Garrett
 *          Dave Airlie
 */
#include <linux/module.h>
#include <linux/console.h>
#include <drm/drmP.h>

#include "cirrus_drv.h"

int cirrus_modeset = -1;

MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
module_param_named(modeset, cirrus_modeset, int, 0400);

/*
 * This is the generic driver code. This binds the driver to the drm core,
 * which then performs further device association and calls our graphics init
 * functions
 */

static struct drm_driver driver;

/* only bind to the cirrus chip in qemu */
static DEFINE_PCI_DEVICE_TABLE(pciidlist) = {
    { PCI_VENDOR_ID_CIRRUS, PCI_DEVICE_ID_CIRRUS_5446, 0x1af4, 0x1100, 0,
      0, 0 },
    {0,}
};


static void cirrus_kick_out_firmware_fb(struct pci_dev *pdev)
{
    struct apertures_struct *ap;
    bool primary = false;

    ap = alloc_apertures(1);
    ap->ranges[0].base = pci_resource_start(pdev, 0);
    ap->ranges[0].size = pci_resource_len(pdev, 0);

#ifdef CONFIG_X86
    primary = pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW;
#endif
    remove_conflicting_framebuffers(ap, "cirrusdrmfb", primary);
    kfree(ap);
}

static int __devinit
cirrus_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
    cirrus_kick_out_firmware_fb(pdev);

    return drm_get_pci_dev(pdev, ent, &driver);
}

static void cirrus_pci_remove(struct pci_dev *pdev)
{
    struct drm_device *dev = pci_get_drvdata(pdev);

    drm_put_dev(dev);
}

static const struct file_operations cirrus_driver_fops = {
    .owner = THIS_MODULE,
    .open = drm_open,
    .release = drm_release,
    .unlocked_ioctl = drm_ioctl,
    .mmap = cirrus_mmap,
    .poll = drm_poll,
#ifdef CONFIG_COMPAT
    .compat_ioctl = drm_compat_ioctl,
#endif
    .fasync = drm_fasync,
};
static struct drm_driver driver = {
    .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_USE_MTRR,
    .load = cirrus_driver_load,
    .unload = cirrus_driver_unload,
    .fops = &cirrus_driver_fops,
    .name = DRIVER_NAME,
    .desc = DRIVER_DESC,
    .date = DRIVER_DATE,
    .major = DRIVER_MAJOR,
    .minor = DRIVER_MINOR,
    .patchlevel = DRIVER_PATCHLEVEL,
    .gem_init_object = cirrus_gem_init_object,
    .gem_free_object = cirrus_gem_free_object,
    .dumb_create = cirrus_dumb_create,
    .dumb_map_offset = cirrus_dumb_mmap_offset,
    .dumb_destroy = cirrus_dumb_destroy,
};

static struct pci_driver cirrus_pci_driver = {
    .name = DRIVER_NAME,
    .id_table = pciidlist,
    .probe = cirrus_pci_probe,
    .remove = cirrus_pci_remove,
};

static int __init cirrus_init(void)
{
#ifdef CONFIG_VGA_CONSOLE
    if (vgacon_text_force() && cirrus_modeset == -1)
        return -EINVAL;
#endif

    if (cirrus_modeset == 0)
        return -EINVAL;
    return drm_pci_init(&driver, &cirrus_pci_driver);
}

static void __exit cirrus_exit(void)
{
    drm_pci_exit(&driver, &cirrus_pci_driver);
}

module_init(cirrus_init);
module_exit(cirrus_exit);

MODULE_DEVICE_TABLE(pci, pciidlist);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");