[mirror_ubuntu-artful-kernel.git] / drivers / video / fbdev / efifb.c

/*
 * 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 struct pci_dev *efifb_pci_dev;	/* dev with BAR covering the efifb */
static struct resource *bar_resource;
static u64 bar_offset;

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;
	}

	if (bar_resource &&
	    bar_resource->start + bar_offset != efifb_fix.smem_start) {
		dev_info(&efifb_pci_dev->dev,
			 "BAR has moved, updating efifb address\n");
		efifb_fix.smem_start = bar_resource->start + bar_offset;
	}

	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)

static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
{
	u16 word;

	efifb_pci_dev = dev;

	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;
	}

	bar_resource = &dev->resource[idx];
	bar_offset = offset;

	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 (efifb_pci_dev || 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) {
			record_efifb_bar_resource(dev, i, base - res->start);
			break;
		}
	}
}
DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
			       16, efifb_fixup_resources);

#endif
Commit	Line	Data
7c83172b HY	1	/*
	2	* Framebuffer driver for EFI/UEFI based system
	3	*
	4	* (c) 2006 Edgar Hucek <gimli@dark-green.com>
	5	* Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
	6	*
	7	*/
	8
7c83172b	9	#include <linux/kernel.h>
21289ec0	10	#include <linux/efi.h>
7c83172b HY	11	#include <linux/errno.h>
7c83172b HY	12	#include <linux/fb.h>
55d728a4	13	#include <linux/pci.h>
7c83172b HY	14	#include <linux/platform_device.h>
7c83172b HY	15	#include <linux/screen_info.h>
7c83172b	16	#include <video/vga.h>
21289ec0	17	#include <asm/efi.h>
7c83172b	18
da0241f1	19	static bool request_mem_succeeded = false;
dd0c41f8	20	static bool nowc = false;
da0241f1	21
48c68c4f	22	static struct fb_var_screeninfo efifb_defined = {
7c83172b HY	23	.activate = FB_ACTIVATE_NOW,
	24	.height = -1,
	25	.width = -1,
	26	.right_margin = 32,
	27	.upper_margin = 16,
	28	.lower_margin = 4,
	29	.vsync_len = 4,
	30	.vmode = FB_VMODE_NONINTERLACED,
	31	};
	32
48c68c4f	33	static struct fb_fix_screeninfo efifb_fix = {
7c83172b HY	34	.id = "EFI VGA",
	35	.type = FB_TYPE_PACKED_PIXELS,
	36	.accel = FB_ACCEL_NONE,
	37	.visual = FB_VISUAL_TRUECOLOR,
	38	};
	39
	40	static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
	41	unsigned blue, unsigned transp,
	42	struct fb_info *info)
	43	{
	44	/*
	45	* Set a single color register. The values supplied are
	46	* already rounded down to the hardware's capabilities
	47	* (according to the entries in the `var' structure). Return
	48	* != 0 for invalid regno.
	49	*/
	50
	51	if (regno >= info->cmap.len)
	52	return 1;
	53
	54	if (regno < 16) {
d50b3f43 MS	55	red >>= 16 - info->var.red.length;
	56	green >>= 16 - info->var.green.length;
	57	blue >>= 16 - info->var.blue.length;
7c83172b HY	58	((u32 *)(info->pseudo_palette))[regno] =
	59	(red << info->var.red.offset) \|
	60	(green << info->var.green.offset) \|
	61	(blue << info->var.blue.offset);
	62	}
	63	return 0;
	64	}
	65
89f3f219 MS	66	static void efifb_destroy(struct fb_info *info)
	67	{
	68	if (info->screen_base)
	69	iounmap(info->screen_base);
da0241f1 AL	70	if (request_mem_succeeded)
	71	release_mem_region(info->apertures->ranges[0].base,
	72	info->apertures->ranges[0].size);
907355a9	73	fb_dealloc_cmap(&info->cmap);
89f3f219 MS	74	}
89f3f219 MS	75
7c83172b HY	76	static struct fb_ops efifb_ops = {
7c83172b HY	77	.owner = THIS_MODULE,
89f3f219	78	.fb_destroy = efifb_destroy,
7c83172b HY	79	.fb_setcolreg = efifb_setcolreg,
	80	.fb_fillrect = cfb_fillrect,
	81	.fb_copyarea = cfb_copyarea,
	82	.fb_imageblit = cfb_imageblit,
	83	};
	84
e6816a8d	85	static int efifb_setup(char *options)
7c08c9ae PJ	86	{
7c08c9ae PJ	87	char *this_opt;
7c08c9ae	88
b4aa0163 MG	89	if (options && *options) {
	90	while ((this_opt = strsep(&options, ",")) != NULL) {
	91	if (!*this_opt) continue;
7c08c9ae	92
21289ec0 AB	93	efifb_setup_from_dmi(&screen_info, this_opt);
21289ec0 AB	94
b4aa0163 MG	95	if (!strncmp(this_opt, "base:", 5))
	96	screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
	97	else if (!strncmp(this_opt, "stride:", 7))
	98	screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
	99	else if (!strncmp(this_opt, "height:", 7))
	100	screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
	101	else if (!strncmp(this_opt, "width:", 6))
	102	screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
dd0c41f8 DA	103	else if (!strcmp(this_opt, "nowc"))
dd0c41f8 DA	104	nowc = true;
7c08c9ae	105	}
7c08c9ae	106	}
b4aa0163	107
7c08c9ae PJ	108	return 0;
	109	}
	110
ae2ee627 MF	111	static inline bool fb_base_is_valid(void)
	112	{
	113	if (screen_info.lfb_base)
	114	return true;
	115
	116	if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
	117	return false;
	118
	119	if (screen_info.ext_lfb_base)
	120	return true;
	121
	122	return false;
	123	}
	124
753375a8 PJ	125	#define efifb_attr_decl(name, fmt) \
	126	static ssize_t name##_show(struct device *dev, \
	127	struct device_attribute *attr, \
	128	char *buf) \
	129	{ \
	130	return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
	131	} \
	132	static DEVICE_ATTR_RO(name)
	133
	134	efifb_attr_decl(base, "0x%x");
	135	efifb_attr_decl(linelength, "%u");
	136	efifb_attr_decl(height, "%u");
	137	efifb_attr_decl(width, "%u");
	138	efifb_attr_decl(depth, "%u");
	139
	140	static struct attribute *efifb_attrs[] = {
	141	&dev_attr_base.attr,
	142	&dev_attr_linelength.attr,
	143	&dev_attr_width.attr,
	144	&dev_attr_height.attr,
	145	&dev_attr_depth.attr,
	146	NULL
	147	};
	148	ATTRIBUTE_GROUPS(efifb);
	149
55d728a4 AB	150	static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */
55d728a4 AB	151
e8d42341 AB	152	static struct pci_dev efifb_pci_dev; / dev with BAR covering the efifb */
	153	static struct resource *bar_resource;
	154	static u64 bar_offset;
	155
e6816a8d	156	static int efifb_probe(struct platform_device *dev)
7c83172b HY	157	{
	158	struct fb_info *info;
	159	int err;
	160	unsigned int size_vmode;
	161	unsigned int size_remap;
	162	unsigned int size_total;
e6816a8d DH	163	char *option = NULL;
e6816a8d DH	164
55d728a4	165	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI \|\| pci_dev_disabled)
e6816a8d DH	166	return -ENODEV;
	167
	168	if (fb_get_options("efifb", &option))
	169	return -ENODEV;
	170	efifb_setup(option);
	171
	172	/* We don't get linelength from UGA Draw Protocol, only from
	173	* EFI Graphics Protocol. So if it's not in DMI, and it's not
	174	* passed in from the user, we really can't use the framebuffer.
	175	*/
	176	if (!screen_info.lfb_linelength)
	177	return -ENODEV;
7c08c9ae	178
7c08c9ae PJ	179	if (!screen_info.lfb_depth)
	180	screen_info.lfb_depth = 32;
	181	if (!screen_info.pages)
	182	screen_info.pages = 1;
ae2ee627	183	if (!fb_base_is_valid()) {
133bb070 MG	184	printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
	185	return -ENODEV;
	186	}
	187	printk(KERN_INFO "efifb: probing for efifb\n");
7c08c9ae PJ	188
	189	/* just assume they're all unset if any are */
	190	if (!screen_info.blue_size) {
	191	screen_info.blue_size = 8;
	192	screen_info.blue_pos = 0;
	193	screen_info.green_size = 8;
	194	screen_info.green_pos = 8;
	195	screen_info.red_size = 8;
	196	screen_info.red_pos = 16;
	197	screen_info.rsvd_size = 8;
	198	screen_info.rsvd_pos = 24;
	199	}
7c83172b HY	200
7c83172b HY	201	efifb_fix.smem_start = screen_info.lfb_base;
ae2ee627 MF	202
	203	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
	204	u64 ext_lfb_base;
	205
	206	ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
	207	efifb_fix.smem_start \|= ext_lfb_base;
	208	}
	209
e8d42341 AB	210	if (bar_resource &&
	211	bar_resource->start + bar_offset != efifb_fix.smem_start) {
	212	dev_info(&efifb_pci_dev->dev,
	213	"BAR has moved, updating efifb address\n");
	214	efifb_fix.smem_start = bar_resource->start + bar_offset;
	215	}
	216
7c83172b HY	217	efifb_defined.bits_per_pixel = screen_info.lfb_depth;
	218	efifb_defined.xres = screen_info.lfb_width;
	219	efifb_defined.yres = screen_info.lfb_height;
	220	efifb_fix.line_length = screen_info.lfb_linelength;
	221
	222	/* size_vmode -- that is the amount of memory needed for the
	223	* used video mode, i.e. the minimum amount of
	224	* memory we need. */
	225	size_vmode = efifb_defined.yres * efifb_fix.line_length;
	226
	227	/* size_total -- all video memory we have. Used for
	228	* entries, ressource allocation and bounds
	229	* checking. */
	230	size_total = screen_info.lfb_size;
	231	if (size_total < size_vmode)
	232	size_total = size_vmode;
	233
	234	/* size_remap -- the amount of video memory we are going to
	235	* use for efifb. With modern cards it is no
	236	* option to simply use size_total as that
	237	* wastes plenty of kernel address space. */
	238	size_remap = size_vmode * 2;
7c83172b HY	239	if (size_remap > size_total)
7c83172b HY	240	size_remap = size_total;
7c08c9ae PJ	241	if (size_remap % PAGE_SIZE)
7c08c9ae PJ	242	size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
7c83172b HY	243	efifb_fix.smem_len = size_remap;
7c83172b HY	244
7c08c9ae	245	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
da0241f1	246	request_mem_succeeded = true;
7c08c9ae	247	} else {
7c83172b HY	248	/* We cannot make this fatal. Sometimes this comes from magic
7c83172b HY	249	spaces our resource handlers simply don't know about */
753375a8	250	pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
7c83172b	251	efifb_fix.smem_start);
7c08c9ae	252	}
7c83172b HY	253
	254	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
	255	if (!info) {
753375a8	256	pr_err("efifb: cannot allocate framebuffer\n");
7c83172b HY	257	err = -ENOMEM;
	258	goto err_release_mem;
	259	}
65b4021e	260	platform_set_drvdata(dev, info);
7c83172b HY	261	info->pseudo_palette = info->par;
	262	info->par = NULL;
	263
1471ca9a MS	264	info->apertures = alloc_apertures(1);
	265	if (!info->apertures) {
	266	err = -ENOMEM;
	267	goto err_release_fb;
	268	}
	269	info->apertures->ranges[0].base = efifb_fix.smem_start;
	270	info->apertures->ranges[0].size = size_remap;
4410f391	271
dd0c41f8 DA	272	if (nowc)
	273	info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
	274	else
	275	info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
7c83172b	276	if (!info->screen_base) {
753375a8	277	pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
7c83172b HY	278	efifb_fix.smem_len, efifb_fix.smem_start);
7c83172b HY	279	err = -EIO;
7c08c9ae	280	goto err_release_fb;
7c83172b HY	281	}
7c83172b HY	282
753375a8	283	pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
a53dd258	284	efifb_fix.smem_start, size_remap/1024, size_total/1024);
753375a8	285	pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
7c83172b HY	286	efifb_defined.xres, efifb_defined.yres,
	287	efifb_defined.bits_per_pixel, efifb_fix.line_length,
	288	screen_info.pages);
	289
	290	efifb_defined.xres_virtual = efifb_defined.xres;
	291	efifb_defined.yres_virtual = efifb_fix.smem_len /
	292	efifb_fix.line_length;
753375a8	293	pr_info("efifb: scrolling: redraw\n");
7c83172b HY	294	efifb_defined.yres_virtual = efifb_defined.yres;
	295
	296	/* some dummy values for timing to make fbset happy */
	297	efifb_defined.pixclock = 10000000 / efifb_defined.xres *
	298	1000 / efifb_defined.yres;
	299	efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
	300	efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
	301
	302	efifb_defined.red.offset = screen_info.red_pos;
	303	efifb_defined.red.length = screen_info.red_size;
	304	efifb_defined.green.offset = screen_info.green_pos;
	305	efifb_defined.green.length = screen_info.green_size;
	306	efifb_defined.blue.offset = screen_info.blue_pos;
	307	efifb_defined.blue.length = screen_info.blue_size;
	308	efifb_defined.transp.offset = screen_info.rsvd_pos;
	309	efifb_defined.transp.length = screen_info.rsvd_size;
	310
753375a8	311	pr_info("efifb: %s: "
7c83172b HY	312	"size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
	313	"Truecolor",
	314	screen_info.rsvd_size,
	315	screen_info.red_size,
	316	screen_info.green_size,
	317	screen_info.blue_size,
	318	screen_info.rsvd_pos,
	319	screen_info.red_pos,
	320	screen_info.green_pos,
	321	screen_info.blue_pos);
	322
	323	efifb_fix.ypanstep = 0;
	324	efifb_fix.ywrapstep = 0;
	325
	326	info->fbops = &efifb_ops;
	327	info->var = efifb_defined;
	328	info->fix = efifb_fix;
4410f391	329	info->flags = FBINFO_FLAG_DEFAULT \| FBINFO_MISC_FIRMWARE;
7c83172b	330
753375a8 PJ	331	err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
	332	if (err) {
	333	pr_err("efifb: cannot add sysfs attrs\n");
7c83172b HY	334	goto err_unmap;
7c83172b HY	335	}
753375a8 PJ	336	err = fb_alloc_cmap(&info->cmap, 256, 0);
	337	if (err < 0) {
	338	pr_err("efifb: cannot allocate colormap\n");
	339	goto err_groups;
	340	}
	341	err = register_framebuffer(info);
	342	if (err < 0) {
	343	pr_err("efifb: cannot register framebuffer\n");
7c83172b HY	344	goto err_fb_dealoc;
7c83172b HY	345	}
31b6780c	346	fb_info(info, "%s frame buffer device\n", info->fix.id);
7c83172b HY	347	return 0;
	348
	349	err_fb_dealoc:
	350	fb_dealloc_cmap(&info->cmap);
753375a8 PJ	351	err_groups:
753375a8 PJ	352	sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
7c83172b HY	353	err_unmap:
7c83172b HY	354	iounmap(info->screen_base);
7c08c9ae	355	err_release_fb:
7c83172b HY	356	framebuffer_release(info);
7c83172b HY	357	err_release_mem:
da0241f1	358	if (request_mem_succeeded)
7c08c9ae	359	release_mem_region(efifb_fix.smem_start, size_total);
7c83172b HY	360	return err;
	361	}
	362
65b4021e DH	363	static int efifb_remove(struct platform_device *pdev)
	364	{
	365	struct fb_info *info = platform_get_drvdata(pdev);
	366
	367	unregister_framebuffer(info);
753375a8	368	sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
65b4021e DH	369	framebuffer_release(info);
	370
	371	return 0;
	372	}
	373
7c83172b	374	static struct platform_driver efifb_driver = {
e6816a8d DH	375	.driver = {
e6816a8d DH	376	.name = "efi-framebuffer",
7c83172b	377	},
e6816a8d	378	.probe = efifb_probe,
65b4021e	379	.remove = efifb_remove,
7c83172b HY	380	};
7c83172b HY	381
07ea7ec5	382	builtin_platform_driver(efifb_driver);
55d728a4	383
e8d42341	384	#if defined(CONFIG_PCI)
55d728a4	385
e8d42341	386	static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
55d728a4 AB	387	{
	388	u16 word;
	389
e8d42341	390	efifb_pci_dev = dev;
55d728a4 AB	391
	392	pci_read_config_word(dev, PCI_COMMAND, &word);
	393	if (!(word & PCI_COMMAND_MEMORY)) {
	394	pci_dev_disabled = true;
	395	dev_err(&dev->dev,
	396	"BAR %d: assigned to efifb but device is disabled!\n",
	397	idx);
	398	return;
	399	}
	400
e8d42341 AB	401	bar_resource = &dev->resource[idx];
e8d42341 AB	402	bar_offset = offset;
55d728a4 AB	403
	404	dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
	405	}
	406
	407	static void efifb_fixup_resources(struct pci_dev *dev)
	408	{
	409	u64 base = screen_info.lfb_base;
	410	u64 size = screen_info.lfb_size;
	411	int i;
	412
e8d42341	413	if (efifb_pci_dev \|\| screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
55d728a4 AB	414	return;
	415
	416	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
	417	base \|= (u64)screen_info.ext_lfb_base << 32;
	418
	419	if (!base)
	420	return;
	421
92a16c86	422	for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
55d728a4 AB	423	struct resource *res = &dev->resource[i];
	424
	425	if (!(res->flags & IORESOURCE_MEM))
	426	continue;
	427
	428	if (res->start <= base && res->end >= base + size - 1) {
e8d42341	429	record_efifb_bar_resource(dev, i, base - res->start);
55d728a4 AB	430	break;
	431	}
	432	}
	433	}
	434	DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
	435	16, efifb_fixup_resources);
	436
	437	#endif