lxfb_core.c

Linux环境下视频显示卡设备的驱动程序源代码

	if (ret)
		return ret;

	ret = pci_request_region(dev, 0, "lxfb-framebuffer");

	if (ret)
		return ret;

	ret = pci_request_region(dev, 1, "lxfb-gp");

	if (ret)
		return ret;

	ret = pci_request_region(dev, 2, "lxfb-vg");

	if (ret)
		return ret;

	ret = pci_request_region(dev, 3, "lxfb-vp");

	if (ret)
		return ret;

	info->fix.smem_start = pci_resource_start(dev, 0);
	info->fix.smem_len = vram ? vram : lx_framebuffer_size();

	info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);

	ret = -ENOMEM;

	if (info->screen_base == NULL)
		return ret;

	par->gp_regs = pci_ioremap_bar(dev, 1);

	if (par->gp_regs == NULL)
		return ret;

	par->dc_regs = pci_ioremap_bar(dev, 2);

	if (par->dc_regs == NULL)
		return ret;

	par->vp_regs = pci_ioremap_bar(dev, 3);

	if (par->vp_regs == NULL)
		return ret;

	write_dc(par, DC_UNLOCK, DC_UNLOCK_UNLOCK);
	write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
	write_dc(par, DC_UNLOCK, DC_UNLOCK_LOCK);

	dev_info(&dev->dev, "%d KB of video memory at 0x%lx\n",
		 info->fix.smem_len / 1024, info->fix.smem_start);

	return 0;
}

static struct fb_ops lxfb_ops = {
	.owner		= THIS_MODULE,
	.fb_check_var	= lxfb_check_var,
	.fb_set_par	= lxfb_set_par,
	.fb_setcolreg	= lxfb_setcolreg,
	.fb_blank       = lxfb_blank,
	/* No HW acceleration for now. */
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

static struct fb_info * __init lxfb_init_fbinfo(struct device *dev)
{
	struct lxfb_par *par;
	struct fb_info *info;

	/* Alloc enough space for the pseudo palette. */
	info = framebuffer_alloc(sizeof(struct lxfb_par) + sizeof(u32) * 16,
				 dev);
	if (!info)
		return NULL;

	par = info->par;

	strcpy(info->fix.id, "Geode LX");

	info->fix.type		= FB_TYPE_PACKED_PIXELS;
	info->fix.type_aux	= 0;
	info->fix.xpanstep	= 0;
	info->fix.ypanstep	= 0;
	info->fix.ywrapstep	= 0;
	info->fix.accel		= FB_ACCEL_NONE;

	info->var.nonstd	= 0;
	info->var.activate	= FB_ACTIVATE_NOW;
	info->var.height	= -1;
	info->var.width	= -1;
	info->var.accel_flags = 0;
	info->var.vmode	= FB_VMODE_NONINTERLACED;

	info->fbops		= &lxfb_ops;
	info->flags		= FBINFO_DEFAULT;
	info->node		= -1;

	info->pseudo_palette	= (void *)par + sizeof(struct lxfb_par);

	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
		framebuffer_release(info);
		return NULL;
	}

	info->var.grayscale	= 0;

	return info;
}

#ifdef CONFIG_PM
static int lxfb_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct fb_info *info = pci_get_drvdata(pdev);

	if (state.event == PM_EVENT_SUSPEND) {
		acquire_console_sem();
		lx_powerdown(info);
		fb_set_suspend(info, 1);
		release_console_sem();
	}

	/* there's no point in setting PCI states; we emulate PCI, so
	 * we don't end up getting power savings anyways */

	return 0;
}

static int lxfb_resume(struct pci_dev *pdev)
{
	struct fb_info *info = pci_get_drvdata(pdev);
	int ret;

	acquire_console_sem();
	ret = lx_powerup(info);
	if (ret) {
		printk(KERN_ERR "lxfb:  power up failed!\n");
		return ret;
	}

	fb_set_suspend(info, 0);
	release_console_sem();
	return 0;
}
#else
#define lxfb_suspend NULL
#define lxfb_resume NULL
#endif

static int __init lxfb_probe(struct pci_dev *pdev,
			     const struct pci_device_id *id)
{
	struct lxfb_par *par;
	struct fb_info *info;
	int ret;

	struct fb_videomode *modedb_ptr;
	unsigned int modedb_size;

	info = lxfb_init_fbinfo(&pdev->dev);

	if (info == NULL)
		return -ENOMEM;

	par = info->par;

	ret = lxfb_map_video_memory(info, pdev);

	if (ret < 0) {
		dev_err(&pdev->dev,
			"failed to map frame buffer or controller registers\n");
		goto err;
	}

	/* Set up the desired outputs */

	par->output = 0;
	par->output |= (nopanel) ? 0 : OUTPUT_PANEL;
	par->output |= (nocrt) ? 0 : OUTPUT_CRT;

	/* Set up the mode database */

	get_modedb(&modedb_ptr, &modedb_size);
	ret = fb_find_mode(&info->var, info, mode_option,
			   modedb_ptr, modedb_size, NULL, 16);

	if (ret == 0 || ret == 4) {
		dev_err(&pdev->dev, "could not find valid video mode\n");
		ret = -EINVAL;
		goto err;
	}

	/* Clear the screen of garbage, unless noclear was specified,
	 * in which case we assume the user knows what he is doing */

	if (!noclear)
		memset_io(info->screen_base, 0, info->fix.smem_len);

	/* Set the mode */

	lxfb_check_var(&info->var, info);
	lxfb_set_par(info);

	pm_set_vt_switch(vt_switch);

	if (register_framebuffer(info) < 0) {
		ret = -EINVAL;
		goto err;
	}
	pci_set_drvdata(pdev, info);
	printk(KERN_INFO "fb%d: %s frame buffer device\n",
		info->node, info->fix.id);

	return 0;

err:
	if (info->screen_base) {
		iounmap(info->screen_base);
		pci_release_region(pdev, 0);
	}
	if (par->gp_regs) {
		iounmap(par->gp_regs);
		pci_release_region(pdev, 1);
	}
	if (par->dc_regs) {
		iounmap(par->dc_regs);
		pci_release_region(pdev, 2);
	}
	if (par->vp_regs) {
		iounmap(par->vp_regs);
		pci_release_region(pdev, 3);
	}

	if (info) {
		fb_dealloc_cmap(&info->cmap);
		framebuffer_release(info);
	}

	return ret;
}

static void lxfb_remove(struct pci_dev *pdev)
{
	struct fb_info *info = pci_get_drvdata(pdev);
	struct lxfb_par *par = info->par;

	unregister_framebuffer(info);

	iounmap(info->screen_base);
	pci_release_region(pdev, 0);

	iounmap(par->gp_regs);
	pci_release_region(pdev, 1);

	iounmap(par->dc_regs);
	pci_release_region(pdev, 2);

	iounmap(par->vp_regs);
	pci_release_region(pdev, 3);

	fb_dealloc_cmap(&info->cmap);
	pci_set_drvdata(pdev, NULL);
	framebuffer_release(info);
}

static struct pci_device_id lxfb_id_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_VIDEO) },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, lxfb_id_table);

static struct pci_driver lxfb_driver = {
	.name		= "lxfb",
	.id_table	= lxfb_id_table,
	.probe		= lxfb_probe,
	.remove		= lxfb_remove,
	.suspend	= lxfb_suspend,
	.resume		= lxfb_resume,
};

#ifndef MODULE
static int __init lxfb_setup(char *options)
{
	char *opt;

	if (!options || !*options)
		return 0;

	while ((opt = strsep(&options, ",")) != NULL) {
		if (!*opt)
			continue;

		if (!strcmp(opt, "noclear"))
			noclear = 1;
		else if (!strcmp(opt, "nopanel"))
			nopanel = 1;
		else if (!strcmp(opt, "nocrt"))
			nocrt = 1;
		else
			mode_option = opt;
	}

	return 0;
}
#endif

static int __init lxfb_init(void)
{
#ifndef MODULE
	char *option = NULL;

	if (fb_get_options("lxfb", &option))
		return -ENODEV;

	lxfb_setup(option);
#endif
	return pci_register_driver(&lxfb_driver);
}
static void __exit lxfb_cleanup(void)
{
	pci_unregister_driver(&lxfb_driver);
}

module_init(lxfb_init);
module_exit(lxfb_cleanup);

module_param(mode_option, charp, 0);
MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");

module_param(vram, int, 0);
MODULE_PARM_DESC(vram, "video memory size");

module_param(vt_switch, int, 0);
MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");

MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode LX");
MODULE_LICENSE("GPL");