/* * Framebuffer driver for EFI/UEFI based system * * (c) 2006 Edgar Hucek <gimli@dark-green.com> * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de> * */ #include <linux/kernel.h>#include <linux/efi.h>#include <linux/errno.h>#include <linux/fb.h>#include <linux/pci.h>#include <linux/platform_device.h>#include <linux/screen_info.h>#include <video/vga.h>#include <asm/efi.h> static bool request_mem_succeeded = false;static bool nowc = false; static struct fb_var_screeninfo efifb_defined = {	.activate		= FB_ACTIVATE_NOW,	.height			= -1,	.width			= -1,	.right_margin		= 32,	.upper_margin		= 16,	.lower_margin		= 4,	.vsync_len		= 4,	.vmode			= FB_VMODE_NONINTERLACED,}; static struct fb_fix_screeninfo efifb_fix = {	.id			= "EFI VGA",	.type			= FB_TYPE_PACKED_PIXELS,	.accel			= FB_ACCEL_NONE,	.visual			= FB_VISUAL_TRUECOLOR,}; static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,			   unsigned blue, unsigned transp,			   struct fb_info *info){	/*	 *  Set a single color register. The values supplied are	 *  already rounded down to the hardware's capabilities	 *  (according to the entries in the `var' structure). Return	 *  != 0 for invalid regno.	 */ 	if (regno >= info->cmap.len)		return 1; 	if (regno < 16) {		red   >>= 16 - info->var.red.length;		green >>= 16 - info->var.green.length;		blue  >>= 16 - info->var.blue.length;		((u32 *)(info->pseudo_palette))[regno] =			(red   << info->var.red.offset)   |			(green << info->var.green.offset) |			(blue  << info->var.blue.offset);	}	return 0;} static void efifb_destroy(struct fb_info *info){	if (info->screen_base)		iounmap(info->screen_base);	if (request_mem_succeeded)		release_mem_region(info->apertures->ranges[0].base,				   info->apertures->ranges[0].size);	fb_dealloc_cmap(&info->cmap);} static struct fb_ops efifb_ops = {	.owner		= THIS_MODULE,	.fb_destroy	= efifb_destroy,	.fb_setcolreg	= efifb_setcolreg,	.fb_fillrect	= cfb_fillrect,	.fb_copyarea	= cfb_copyarea,	.fb_imageblit	= cfb_imageblit,}; static int efifb_setup(char *options){	char *this_opt; 	if (options && *options) {		while ((this_opt = strsep(&options, ",")) != NULL) {			if (!*this_opt) continue; 			efifb_setup_from_dmi(&screen_info, this_opt); 			if (!strncmp(this_opt, "base:", 5))				screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);			else if (!strncmp(this_opt, "stride:", 7))				screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;			else if (!strncmp(this_opt, "height:", 7))				screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);			else if (!strncmp(this_opt, "width:", 6))				screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);			else if (!strcmp(this_opt, "nowc"))				nowc = true;		}	} 	return 0;} static inline bool fb_base_is_valid(void){	if (screen_info.lfb_base)		return true; 	if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))		return false; 	if (screen_info.ext_lfb_base)		return true; 	return false;} #define efifb_attr_decl(name, fmt)					\static ssize_t name##_show(struct device *dev,				\			   struct device_attribute *attr,		\			   char *buf)					\{									\	return sprintf(buf, fmt "\n", (screen_info.lfb_##name));	\}									\static DEVICE_ATTR_RO(name) efifb_attr_decl(base, "0x%x");efifb_attr_decl(linelength, "%u");efifb_attr_decl(height, "%u");efifb_attr_decl(width, "%u");efifb_attr_decl(depth, "%u"); static struct attribute *efifb_attrs[] = {	&dev_attr_base.attr,	&dev_attr_linelength.attr,	&dev_attr_width.attr,	&dev_attr_height.attr,	&dev_attr_depth.attr,	NULL};ATTRIBUTE_GROUPS(efifb); static bool pci_dev_disabled;	/* FB base matches BAR of a disabled device */ static int efifb_probe(struct platform_device *dev){	struct fb_info *info;	int err;	unsigned int size_vmode;	unsigned int size_remap;	unsigned int size_total;	char *option = NULL; 	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)		return -ENODEV; 	if (fb_get_options("efifb", &option))		return -ENODEV;	efifb_setup(option); 	/* We don't get linelength from UGA Draw Protocol, only from	 * EFI Graphics Protocol.  So if it's not in DMI, and it's not	 * passed in from the user, we really can't use the framebuffer.	 */	if (!screen_info.lfb_linelength)		return -ENODEV; 	if (!screen_info.lfb_depth)		screen_info.lfb_depth = 32;	if (!screen_info.pages)		screen_info.pages = 1;	if (!fb_base_is_valid()) {		printk(KERN_DEBUG "efifb: invalid framebuffer address\n");		return -ENODEV;	}	printk(KERN_INFO "efifb: probing for efifb\n"); 	/* just assume they're all unset if any are */	if (!screen_info.blue_size) {		screen_info.blue_size = 8;		screen_info.blue_pos = 0;		screen_info.green_size = 8;		screen_info.green_pos = 8;		screen_info.red_size = 8;		screen_info.red_pos = 16;		screen_info.rsvd_size = 8;		screen_info.rsvd_pos = 24;	} 	efifb_fix.smem_start = screen_info.lfb_base; 	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {		u64 ext_lfb_base; 		ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;		efifb_fix.smem_start |= ext_lfb_base;	} 	efifb_defined.bits_per_pixel = screen_info.lfb_depth;	efifb_defined.xres = screen_info.lfb_width;	efifb_defined.yres = screen_info.lfb_height;	efifb_fix.line_length = screen_info.lfb_linelength; 	/*   size_vmode -- that is the amount of memory needed for the	 *                 used video mode, i.e. the minimum amount of	 *                 memory we need. */	size_vmode = efifb_defined.yres * efifb_fix.line_length; 	/*   size_total -- all video memory we have. Used for	 *                 entries, ressource allocation and bounds	 *                 checking. */	size_total = screen_info.lfb_size;	if (size_total < size_vmode)		size_total = size_vmode; 	/*   size_remap -- the amount of video memory we are going to	 *                 use for efifb.  With modern cards it is no	 *                 option to simply use size_total as that	 *                 wastes plenty of kernel address space. */	size_remap  = size_vmode * 2;	if (size_remap > size_total)		size_remap = size_total;	if (size_remap % PAGE_SIZE)		size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);	efifb_fix.smem_len = size_remap; 	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {		request_mem_succeeded = true;	} else {		/* We cannot make this fatal. Sometimes this comes from magic		   spaces our resource handlers simply don't know about */		pr_warn("efifb: cannot reserve video memory at 0x%lx\n",			efifb_fix.smem_start);	} 	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);	if (!info) {		pr_err("efifb: cannot allocate framebuffer\n");		err = -ENOMEM;		goto err_release_mem;	}	platform_set_drvdata(dev, info);	info->pseudo_palette = info->par;	info->par = NULL; 	info->apertures = alloc_apertures(1);	if (!info->apertures) {		err = -ENOMEM;		goto err_release_fb;	}	info->apertures->ranges[0].base = efifb_fix.smem_start;	info->apertures->ranges[0].size = size_remap; 	if (nowc)		info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);	else		info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);	if (!info->screen_base) {		pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",			efifb_fix.smem_len, efifb_fix.smem_start);		err = -EIO;		goto err_release_fb;	} 	pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",	       efifb_fix.smem_start, size_remap/1024, size_total/1024);	pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",	       efifb_defined.xres, efifb_defined.yres,	       efifb_defined.bits_per_pixel, efifb_fix.line_length,	       screen_info.pages); 	efifb_defined.xres_virtual = efifb_defined.xres;	efifb_defined.yres_virtual = efifb_fix.smem_len /					efifb_fix.line_length;	pr_info("efifb: scrolling: redraw\n");	efifb_defined.yres_virtual = efifb_defined.yres; 	/* some dummy values for timing to make fbset happy */	efifb_defined.pixclock     = 10000000 / efifb_defined.xres *					1000 / efifb_defined.yres;	efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;	efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8; 	efifb_defined.red.offset    = screen_info.red_pos;	efifb_defined.red.length    = screen_info.red_size;	efifb_defined.green.offset  = screen_info.green_pos;	efifb_defined.green.length  = screen_info.green_size;	efifb_defined.blue.offset   = screen_info.blue_pos;	efifb_defined.blue.length   = screen_info.blue_size;	efifb_defined.transp.offset = screen_info.rsvd_pos;	efifb_defined.transp.length = screen_info.rsvd_size; 	pr_info("efifb: %s: "	       "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",	       "Truecolor",	       screen_info.rsvd_size,	       screen_info.red_size,	       screen_info.green_size,	       screen_info.blue_size,	       screen_info.rsvd_pos,	       screen_info.red_pos,	       screen_info.green_pos,	       screen_info.blue_pos); 	efifb_fix.ypanstep  = 0;	efifb_fix.ywrapstep = 0; 	info->fbops = &efifb_ops;	info->var = efifb_defined;	info->fix = efifb_fix;	info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE; 	err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);	if (err) {		pr_err("efifb: cannot add sysfs attrs\n");		goto err_unmap;	}	err = fb_alloc_cmap(&info->cmap, 256, 0);	if (err < 0) {		pr_err("efifb: cannot allocate colormap\n");		goto err_groups;	}	err = register_framebuffer(info);	if (err < 0) {		pr_err("efifb: cannot register framebuffer\n");		goto err_fb_dealoc;	}	fb_info(info, "%s frame buffer device\n", info->fix.id);	return 0; err_fb_dealoc:	fb_dealloc_cmap(&info->cmap);err_groups:	sysfs_remove_groups(&dev->dev.kobj, efifb_groups);err_unmap:	iounmap(info->screen_base);err_release_fb:	framebuffer_release(info);err_release_mem:	if (request_mem_succeeded)		release_mem_region(efifb_fix.smem_start, size_total);	return err;} static int efifb_remove(struct platform_device *pdev){	struct fb_info *info = platform_get_drvdata(pdev); 	unregister_framebuffer(info);	sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);	framebuffer_release(info); 	return 0;} static struct platform_driver efifb_driver = {	.driver = {		.name = "efi-framebuffer",	},	.probe = efifb_probe,	.remove = efifb_remove,}; builtin_platform_driver(efifb_driver); #if defined(CONFIG_PCI) && !defined(CONFIG_X86) static bool pci_bar_found;	/* did we find a BAR matching the efifb base? */ static void claim_efifb_bar(struct pci_dev *dev, int idx){	u16 word; 	pci_bar_found = true; 	pci_read_config_word(dev, PCI_COMMAND, &word);	if (!(word & PCI_COMMAND_MEMORY)) {		pci_dev_disabled = true;		dev_err(&dev->dev,			"BAR %d: assigned to efifb but device is disabled!\n",			idx);		return;	} 	if (pci_claim_resource(dev, idx)) {		pci_dev_disabled = true;		dev_err(&dev->dev,			"BAR %d: failed to claim resource for efifb!\n", idx);		return;	} 	dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);} static void efifb_fixup_resources(struct pci_dev *dev){	u64 base = screen_info.lfb_base;	u64 size = screen_info.lfb_size;	int i; 	if (pci_bar_found || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)		return; 	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)		base |= (u64)screen_info.ext_lfb_base << 32; 	if (!base)		return; 	for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {		struct resource *res = &dev->resource[i]; 		if (!(res->flags & IORESOURCE_MEM))			continue; 		if (res->start <= base && res->end >= base + size - 1) {			claim_efifb_bar(dev, i);			break;		}	}}DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,			       16, efifb_fixup_resources); #endif