[mirror_ubuntu-bionic-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 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);
		}
	}

	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;

	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
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 AL	19	static bool request_mem_succeeded = false;
da0241f1 AL	20
48c68c4f	21	static struct fb_var_screeninfo efifb_defined = {
7c83172b HY	22	.activate = FB_ACTIVATE_NOW,
	23	.height = -1,
	24	.width = -1,
	25	.right_margin = 32,
	26	.upper_margin = 16,
	27	.lower_margin = 4,
	28	.vsync_len = 4,
	29	.vmode = FB_VMODE_NONINTERLACED,
	30	};
	31
48c68c4f	32	static struct fb_fix_screeninfo efifb_fix = {
7c83172b HY	33	.id = "EFI VGA",
	34	.type = FB_TYPE_PACKED_PIXELS,
	35	.accel = FB_ACCEL_NONE,
	36	.visual = FB_VISUAL_TRUECOLOR,
	37	};
	38
	39	static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
	40	unsigned blue, unsigned transp,
	41	struct fb_info *info)
	42	{
	43	/*
	44	* Set a single color register. The values supplied are
	45	* already rounded down to the hardware's capabilities
	46	* (according to the entries in the `var' structure). Return
	47	* != 0 for invalid regno.
	48	*/
	49
	50	if (regno >= info->cmap.len)
	51	return 1;
	52
	53	if (regno < 16) {
d50b3f43 MS	54	red >>= 16 - info->var.red.length;
	55	green >>= 16 - info->var.green.length;
	56	blue >>= 16 - info->var.blue.length;
7c83172b HY	57	((u32 *)(info->pseudo_palette))[regno] =
	58	(red << info->var.red.offset) \|
	59	(green << info->var.green.offset) \|
	60	(blue << info->var.blue.offset);
	61	}
	62	return 0;
	63	}
	64
89f3f219 MS	65	static void efifb_destroy(struct fb_info *info)
	66	{
	67	if (info->screen_base)
	68	iounmap(info->screen_base);
da0241f1 AL	69	if (request_mem_succeeded)
	70	release_mem_region(info->apertures->ranges[0].base,
	71	info->apertures->ranges[0].size);
907355a9	72	fb_dealloc_cmap(&info->cmap);
89f3f219 MS	73	}
89f3f219 MS	74
7c83172b HY	75	static struct fb_ops efifb_ops = {
7c83172b HY	76	.owner = THIS_MODULE,
89f3f219	77	.fb_destroy = efifb_destroy,
7c83172b HY	78	.fb_setcolreg = efifb_setcolreg,
	79	.fb_fillrect = cfb_fillrect,
	80	.fb_copyarea = cfb_copyarea,
	81	.fb_imageblit = cfb_imageblit,
	82	};
	83
e6816a8d	84	static int efifb_setup(char *options)
7c08c9ae PJ	85	{
7c08c9ae PJ	86	char *this_opt;
7c08c9ae	87
b4aa0163 MG	88	if (options && *options) {
	89	while ((this_opt = strsep(&options, ",")) != NULL) {
	90	if (!*this_opt) continue;
7c08c9ae	91
21289ec0 AB	92	efifb_setup_from_dmi(&screen_info, this_opt);
21289ec0 AB	93
b4aa0163 MG	94	if (!strncmp(this_opt, "base:", 5))
	95	screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
	96	else if (!strncmp(this_opt, "stride:", 7))
	97	screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
	98	else if (!strncmp(this_opt, "height:", 7))
	99	screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
	100	else if (!strncmp(this_opt, "width:", 6))
	101	screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
7c08c9ae	102	}
7c08c9ae	103	}
b4aa0163	104
7c08c9ae PJ	105	return 0;
	106	}
	107
ae2ee627 MF	108	static inline bool fb_base_is_valid(void)
	109	{
	110	if (screen_info.lfb_base)
	111	return true;
	112
	113	if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
	114	return false;
	115
	116	if (screen_info.ext_lfb_base)
	117	return true;
	118
	119	return false;
	120	}
	121
753375a8 PJ	122	#define efifb_attr_decl(name, fmt) \
	123	static ssize_t name##_show(struct device *dev, \
	124	struct device_attribute *attr, \
	125	char *buf) \
	126	{ \
	127	return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
	128	} \
	129	static DEVICE_ATTR_RO(name)
	130
	131	efifb_attr_decl(base, "0x%x");
	132	efifb_attr_decl(linelength, "%u");
	133	efifb_attr_decl(height, "%u");
	134	efifb_attr_decl(width, "%u");
	135	efifb_attr_decl(depth, "%u");
	136
	137	static struct attribute *efifb_attrs[] = {
	138	&dev_attr_base.attr,
	139	&dev_attr_linelength.attr,
	140	&dev_attr_width.attr,
	141	&dev_attr_height.attr,
	142	&dev_attr_depth.attr,
	143	NULL
	144	};
	145	ATTRIBUTE_GROUPS(efifb);
	146
55d728a4 AB	147	static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */
55d728a4 AB	148
e6816a8d	149	static int efifb_probe(struct platform_device *dev)
7c83172b HY	150	{
	151	struct fb_info *info;
	152	int err;
	153	unsigned int size_vmode;
	154	unsigned int size_remap;
	155	unsigned int size_total;
e6816a8d DH	156	char *option = NULL;
e6816a8d DH	157
55d728a4	158	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI \|\| pci_dev_disabled)
e6816a8d DH	159	return -ENODEV;
	160
	161	if (fb_get_options("efifb", &option))
	162	return -ENODEV;
	163	efifb_setup(option);
	164
	165	/* We don't get linelength from UGA Draw Protocol, only from
	166	* EFI Graphics Protocol. So if it's not in DMI, and it's not
	167	* passed in from the user, we really can't use the framebuffer.
	168	*/
	169	if (!screen_info.lfb_linelength)
	170	return -ENODEV;
7c08c9ae	171
7c08c9ae PJ	172	if (!screen_info.lfb_depth)
	173	screen_info.lfb_depth = 32;
	174	if (!screen_info.pages)
	175	screen_info.pages = 1;
ae2ee627	176	if (!fb_base_is_valid()) {
133bb070 MG	177	printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
	178	return -ENODEV;
	179	}
	180	printk(KERN_INFO "efifb: probing for efifb\n");
7c08c9ae PJ	181
	182	/* just assume they're all unset if any are */
	183	if (!screen_info.blue_size) {
	184	screen_info.blue_size = 8;
	185	screen_info.blue_pos = 0;
	186	screen_info.green_size = 8;
	187	screen_info.green_pos = 8;
	188	screen_info.red_size = 8;
	189	screen_info.red_pos = 16;
	190	screen_info.rsvd_size = 8;
	191	screen_info.rsvd_pos = 24;
	192	}
7c83172b HY	193
7c83172b HY	194	efifb_fix.smem_start = screen_info.lfb_base;
ae2ee627 MF	195
	196	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
	197	u64 ext_lfb_base;
	198
	199	ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
	200	efifb_fix.smem_start \|= ext_lfb_base;
	201	}
	202
7c83172b HY	203	efifb_defined.bits_per_pixel = screen_info.lfb_depth;
	204	efifb_defined.xres = screen_info.lfb_width;
	205	efifb_defined.yres = screen_info.lfb_height;
	206	efifb_fix.line_length = screen_info.lfb_linelength;
	207
	208	/* size_vmode -- that is the amount of memory needed for the
	209	* used video mode, i.e. the minimum amount of
	210	* memory we need. */
	211	size_vmode = efifb_defined.yres * efifb_fix.line_length;
	212
	213	/* size_total -- all video memory we have. Used for
	214	* entries, ressource allocation and bounds
	215	* checking. */
	216	size_total = screen_info.lfb_size;
	217	if (size_total < size_vmode)
	218	size_total = size_vmode;
	219
	220	/* size_remap -- the amount of video memory we are going to
	221	* use for efifb. With modern cards it is no
	222	* option to simply use size_total as that
	223	* wastes plenty of kernel address space. */
	224	size_remap = size_vmode * 2;
7c83172b HY	225	if (size_remap > size_total)
7c83172b HY	226	size_remap = size_total;
7c08c9ae PJ	227	if (size_remap % PAGE_SIZE)
7c08c9ae PJ	228	size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
7c83172b HY	229	efifb_fix.smem_len = size_remap;
7c83172b HY	230
7c08c9ae	231	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
da0241f1	232	request_mem_succeeded = true;
7c08c9ae	233	} else {
7c83172b HY	234	/* We cannot make this fatal. Sometimes this comes from magic
7c83172b HY	235	spaces our resource handlers simply don't know about */
753375a8	236	pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
7c83172b	237	efifb_fix.smem_start);
7c08c9ae	238	}
7c83172b HY	239
	240	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
	241	if (!info) {
753375a8	242	pr_err("efifb: cannot allocate framebuffer\n");
7c83172b HY	243	err = -ENOMEM;
	244	goto err_release_mem;
	245	}
65b4021e	246	platform_set_drvdata(dev, info);
7c83172b HY	247	info->pseudo_palette = info->par;
	248	info->par = NULL;
	249
1471ca9a MS	250	info->apertures = alloc_apertures(1);
	251	if (!info->apertures) {
	252	err = -ENOMEM;
	253	goto err_release_fb;
	254	}
	255	info->apertures->ranges[0].base = efifb_fix.smem_start;
	256	info->apertures->ranges[0].size = size_remap;
4410f391	257
3c004b4f	258	info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
7c83172b	259	if (!info->screen_base) {
753375a8	260	pr_err("efifb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
7c83172b HY	261	efifb_fix.smem_len, efifb_fix.smem_start);
7c83172b HY	262	err = -EIO;
7c08c9ae	263	goto err_release_fb;
7c83172b HY	264	}
7c83172b HY	265
753375a8	266	pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
a53dd258	267	efifb_fix.smem_start, size_remap/1024, size_total/1024);
753375a8	268	pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
7c83172b HY	269	efifb_defined.xres, efifb_defined.yres,
	270	efifb_defined.bits_per_pixel, efifb_fix.line_length,
	271	screen_info.pages);
	272
	273	efifb_defined.xres_virtual = efifb_defined.xres;
	274	efifb_defined.yres_virtual = efifb_fix.smem_len /
	275	efifb_fix.line_length;
753375a8	276	pr_info("efifb: scrolling: redraw\n");
7c83172b HY	277	efifb_defined.yres_virtual = efifb_defined.yres;
	278
	279	/* some dummy values for timing to make fbset happy */
	280	efifb_defined.pixclock = 10000000 / efifb_defined.xres *
	281	1000 / efifb_defined.yres;
	282	efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
	283	efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
	284
	285	efifb_defined.red.offset = screen_info.red_pos;
	286	efifb_defined.red.length = screen_info.red_size;
	287	efifb_defined.green.offset = screen_info.green_pos;
	288	efifb_defined.green.length = screen_info.green_size;
	289	efifb_defined.blue.offset = screen_info.blue_pos;
	290	efifb_defined.blue.length = screen_info.blue_size;
	291	efifb_defined.transp.offset = screen_info.rsvd_pos;
	292	efifb_defined.transp.length = screen_info.rsvd_size;
	293
753375a8	294	pr_info("efifb: %s: "
7c83172b HY	295	"size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
	296	"Truecolor",
	297	screen_info.rsvd_size,
	298	screen_info.red_size,
	299	screen_info.green_size,
	300	screen_info.blue_size,
	301	screen_info.rsvd_pos,
	302	screen_info.red_pos,
	303	screen_info.green_pos,
	304	screen_info.blue_pos);
	305
	306	efifb_fix.ypanstep = 0;
	307	efifb_fix.ywrapstep = 0;
	308
	309	info->fbops = &efifb_ops;
	310	info->var = efifb_defined;
	311	info->fix = efifb_fix;
4410f391	312	info->flags = FBINFO_FLAG_DEFAULT \| FBINFO_MISC_FIRMWARE;
7c83172b	313
753375a8 PJ	314	err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
	315	if (err) {
	316	pr_err("efifb: cannot add sysfs attrs\n");
7c83172b HY	317	goto err_unmap;
7c83172b HY	318	}
753375a8 PJ	319	err = fb_alloc_cmap(&info->cmap, 256, 0);
	320	if (err < 0) {
	321	pr_err("efifb: cannot allocate colormap\n");
	322	goto err_groups;
	323	}
	324	err = register_framebuffer(info);
	325	if (err < 0) {
	326	pr_err("efifb: cannot register framebuffer\n");
7c83172b HY	327	goto err_fb_dealoc;
7c83172b HY	328	}
31b6780c	329	fb_info(info, "%s frame buffer device\n", info->fix.id);
7c83172b HY	330	return 0;
	331
	332	err_fb_dealoc:
	333	fb_dealloc_cmap(&info->cmap);
753375a8 PJ	334	err_groups:
753375a8 PJ	335	sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
7c83172b HY	336	err_unmap:
7c83172b HY	337	iounmap(info->screen_base);
7c08c9ae	338	err_release_fb:
7c83172b HY	339	framebuffer_release(info);
7c83172b HY	340	err_release_mem:
da0241f1	341	if (request_mem_succeeded)
7c08c9ae	342	release_mem_region(efifb_fix.smem_start, size_total);
7c83172b HY	343	return err;
	344	}
	345
65b4021e DH	346	static int efifb_remove(struct platform_device *pdev)
	347	{
	348	struct fb_info *info = platform_get_drvdata(pdev);
	349
	350	unregister_framebuffer(info);
753375a8	351	sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
65b4021e DH	352	framebuffer_release(info);
	353
	354	return 0;
	355	}
	356
7c83172b	357	static struct platform_driver efifb_driver = {
e6816a8d DH	358	.driver = {
e6816a8d DH	359	.name = "efi-framebuffer",
7c83172b	360	},
e6816a8d	361	.probe = efifb_probe,
65b4021e	362	.remove = efifb_remove,
7c83172b HY	363	};
7c83172b HY	364
07ea7ec5	365	builtin_platform_driver(efifb_driver);
55d728a4 AB	366
	367	#if defined(CONFIG_PCI) && !defined(CONFIG_X86)
	368
	369	static bool pci_bar_found; /* did we find a BAR matching the efifb base? */
	370
	371	static void claim_efifb_bar(struct pci_dev *dev, int idx)
	372	{
	373	u16 word;
	374
	375	pci_bar_found = true;
	376
	377	pci_read_config_word(dev, PCI_COMMAND, &word);
	378	if (!(word & PCI_COMMAND_MEMORY)) {
	379	pci_dev_disabled = true;
	380	dev_err(&dev->dev,
	381	"BAR %d: assigned to efifb but device is disabled!\n",
	382	idx);
	383	return;
	384	}
	385
	386	if (pci_claim_resource(dev, idx)) {
	387	pci_dev_disabled = true;
	388	dev_err(&dev->dev,
	389	"BAR %d: failed to claim resource for efifb!\n", idx);
	390	return;
	391	}
	392
	393	dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
	394	}
	395
	396	static void efifb_fixup_resources(struct pci_dev *dev)
	397	{
	398	u64 base = screen_info.lfb_base;
	399	u64 size = screen_info.lfb_size;
	400	int i;
	401
	402	if (pci_bar_found \|\| screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
	403	return;
	404
	405	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
	406	base \|= (u64)screen_info.ext_lfb_base << 32;
	407
	408	if (!base)
	409	return;
	410
	411	for (i = 0; i < PCI_STD_RESOURCE_END; i++) {
	412	struct resource *res = &dev->resource[i];
	413
	414	if (!(res->flags & IORESOURCE_MEM))
	415	continue;
	416
	417	if (res->start <= base && res->end >= base + size - 1) {
	418	claim_efifb_bar(dev, i);
	419	break;
	420	}
	421	}
	422	}
	423	DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
	424	16, efifb_fixup_resources);
	425
	426	#endif