/* * 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/module.h>#include <linux/kernel.h>#include <linux/errno.h>#include <linux/fb.h>#include <linux/platform_device.h>#include <linux/screen_info.h>#include <linux/dmi.h>#include <video/vga.h>static struct fb_var_screeninfo efifb_defined __initdata = {	.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 __initdata = {	.id			= "EFI VGA",	.type			= FB_TYPE_PACKED_PIXELS,	.accel			= FB_ACCEL_NONE,	.visual			= FB_VISUAL_TRUECOLOR,};enum {	M_I17,		/* 17-Inch iMac */	M_I20,		/* 20-Inch iMac */	M_I20_SR,	/* 20-Inch iMac (Santa Rosa) */	M_I24,		/* 24-Inch iMac */	M_MINI,		/* Mac Mini */	M_MB,		/* MacBook */	M_MB_2,		/* MacBook, 2nd rev. */	M_MB_3,		/* MacBook, 3rd rev. */	M_MB_SR,	/* MacBook, 2nd gen, (Santa Rosa) */	M_MBA,		/* MacBook Air */	M_MBP,		/* MacBook Pro */	M_MBP_2,	/* MacBook Pro 2nd gen */	M_MBP_SR,	/* MacBook Pro (Santa Rosa) */	M_MBP_4,	/* MacBook Pro, 4th gen */	M_UNKNOWN	/* placeholder */};static struct efifb_dmi_info {	char *optname;	unsigned long base;	int stride;	int width;	int height;} dmi_list[] = {	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900 },	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050 }, /* guess */	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050 },	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200 }, /* guess */	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768 },	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800 },	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800 },	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900 },	[M_MBP_2] = { "mbp2", 0, 0, 0, 0 }, /* placeholder */	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900 },	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200 },	[M_UNKNOWN] = { NULL, 0, 0, 0, 0 }};static int set_system(const struct dmi_system_id *id);#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)		\	{ set_system, name, {					\		DMI_MATCH(DMI_BIOS_VENDOR, vendor),		\		DMI_MATCH(DMI_PRODUCT_NAME, name) },		\	  &dmi_list[enumid] }static struct dmi_system_id __initdata dmi_system_table[] = {	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),	/* At least one of these two will be right; maybe both? */	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),	/* At least one of these two will be right; maybe both? */	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),	/* At least one of these two will be right; maybe both? */	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),	/* At least one of these two will be right; maybe both? */	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),	{},};static int set_system(const struct dmi_system_id *id){	struct efifb_dmi_info *info = id->driver_data;	if (info->base == 0)		return -ENODEV;	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at %p "			 "(%dx%d, stride %d)\n", id->ident,			 (void *)info->base, info->width, info->height,			 info->stride);	/* Trust the bootloader over the DMI tables */	if (screen_info.lfb_base == 0)		screen_info.lfb_base = info->base;	if (screen_info.lfb_linelength == 0)		screen_info.lfb_linelength = info->stride;	if (screen_info.lfb_width == 0)		screen_info.lfb_width = info->width;	if (screen_info.lfb_height == 0)		screen_info.lfb_height = info->height;	return 0;}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   >>= 8;		green >>= 8;		blue  >>= 8;		((u32 *)(info->pseudo_palette))[regno] =			(red   << info->var.red.offset)   |			(green << info->var.green.offset) |			(blue  << info->var.blue.offset);	}	return 0;}static struct fb_ops efifb_ops = {	.owner		= THIS_MODULE,	.fb_setcolreg	= efifb_setcolreg,	.fb_fillrect	= cfb_fillrect,	.fb_copyarea	= cfb_copyarea,	.fb_imageblit	= cfb_imageblit,};static int __init efifb_setup(char *options){	char *this_opt;	int i;	if (!options || !*options)		return 0;	while ((this_opt = strsep(&options, ",")) != NULL) {		if (!*this_opt) continue;		for (i = 0; i < M_UNKNOWN; i++) {			if (!strcmp(this_opt, dmi_list[i].optname) &&					dmi_list[i].base != 0) {				screen_info.lfb_base = dmi_list[i].base;				screen_info.lfb_linelength = dmi_list[i].stride;				screen_info.lfb_width = dmi_list[i].width;				screen_info.lfb_height = dmi_list[i].height;			}		}		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);	}	return 0;}static int __init efifb_probe(struct platform_device *dev){	struct fb_info *info;	int err;	unsigned int size_vmode;	unsigned int size_remap;	unsigned int size_total;	int request_succeeded = 0;	printk(KERN_INFO "efifb: probing for efifb\n");	if (!screen_info.lfb_depth)		screen_info.lfb_depth = 32;	if (!screen_info.pages)		screen_info.pages = 1;	/* 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;	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_succeeded = 1;	} else {		/* We cannot make this fatal. Sometimes this comes from magic		   spaces our resource handlers simply don't know about */		printk(KERN_WARNING		       "efifb: cannot reserve video memory at 0x%lx\n",			efifb_fix.smem_start);	}	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);	if (!info) {		printk(KERN_ERR "efifb: cannot allocate framebuffer\n");		err = -ENOMEM;		goto err_release_mem;	}	info->pseudo_palette = info->par;	info->par = NULL;	info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);	if (!info->screen_base) {		printk(KERN_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;	}	printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "	       "using %dk, total %dk\n",	       efifb_fix.smem_start, info->screen_base,	       size_remap/1024, size_total/1024);	printk(KERN_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;	printk(KERN_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;	printk(KERN_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;	if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {		printk(KERN_ERR "efifb: cannot allocate colormap\n");		goto err_unmap;	}	if ((err = register_framebuffer(info)) < 0) {		printk(KERN_ERR "efifb: cannot register framebuffer\n");		goto err_fb_dealoc;	}	printk(KERN_INFO "fb%d: %s frame buffer device\n",		info->node, info->fix.id);	return 0;err_fb_dealoc:	fb_dealloc_cmap(&info->cmap);err_unmap:	iounmap(info->screen_base);err_release_fb:	framebuffer_release(info);err_release_mem:	if (request_succeeded)		release_mem_region(efifb_fix.smem_start, size_total);	return err;}static struct platform_driver efifb_driver = {	.probe	= efifb_probe,	.driver	= {		.name	= "efifb",	},};static struct platform_device efifb_device = {	.name	= "efifb",};static int __init efifb_init(void){	int ret;	char *option = NULL;	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)		return -ENODEV;	dmi_check_system(dmi_system_table);	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;	ret = platform_driver_register(&efifb_driver);	if (!ret) {		ret = platform_device_register(&efifb_device);		if (ret)			platform_driver_unregister(&efifb_driver);	}	return ret;}module_init(efifb_init);MODULE_LICENSE("GPL");