drivers/firmware: move x86 Generic System Framebuffers support

The x86 architecture has generic support to register a system framebuffer
platform device. It either registers a "simple-framebuffer" if the config
option CONFIG_X86_SYSFB is enabled, or a legacy VGA/VBE/EFI FB device.

But the code is generic enough to be reused by other architectures and can
be moved out of the arch/x86 directory.

This will allow to also support the simple{fb,drm} drivers on non-x86 EFI
platforms, such as aarch64 where these drivers are only supported with DT.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210625130947.1803678-2-javierm@redhat.com

4 files changed, 0 insertions, 468 deletions

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 0f66682ac02a..4114ea47def2 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -135,9 +135,6 @@ obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
 obj-$(CONFIG_SWIOTLB)			+= pci-swiotlb.o
 obj-$(CONFIG_OF)			+= devicetree.o
 obj-$(CONFIG_UPROBES)			+= uprobes.o
-obj-y					+= sysfb.o
-obj-$(CONFIG_X86_SYSFB)			+= sysfb_simplefb.o
-obj-$(CONFIG_EFI)			+= sysfb_efi.o
 
 obj-$(CONFIG_PERF_EVENTS)		+= perf_regs.o
 obj-$(CONFIG_TRACING)			+= tracepoint.o
diff --git a/arch/x86/kernel/sysfb.c b/arch/x86/kernel/sysfb.c
deleted file mode 100644
index 014ebd8ca869..000000000000
--- a/arch/x86/kernel/sysfb.c
+++ /dev/null
@@ -1,70 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Generic System Framebuffers on x86
- * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
- */
-
-/*
- * Simple-Framebuffer support for x86 systems
- * Create a platform-device for any available boot framebuffer. The
- * simple-framebuffer platform device is already available on DT systems, so
- * this module parses the global "screen_info" object and creates a suitable
- * platform device compatible with the "simple-framebuffer" DT object. If
- * the framebuffer is incompatible, we instead create a legacy
- * "vesa-framebuffer", "efi-framebuffer" or "platform-framebuffer" device and
- * pass the screen_info as platform_data. This allows legacy drivers
- * to pick these devices up without messing with simple-framebuffer drivers.
- * The global "screen_info" is still valid at all times.
- *
- * If CONFIG_X86_SYSFB is not selected, we never register "simple-framebuffer"
- * platform devices, but only use legacy framebuffer devices for
- * backwards compatibility.
- *
- * TODO: We set the dev_id field of all platform-devices to 0. This allows
- * other x86 OF/DT parsers to create such devices, too. However, they must
- * start at offset 1 for this to work.
- */
-
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/platform_data/simplefb.h>
-#include <linux/platform_device.h>
-#include <linux/screen_info.h>
-#include <asm/sysfb.h>
-
-static __init int sysfb_init(void)
-{
-	struct screen_info *si = &screen_info;
-	struct simplefb_platform_data mode;
-	struct platform_device *pd;
-	const char *name;
-	bool compatible;
-	int ret;
-
-	sysfb_apply_efi_quirks();
-
-	/* try to create a simple-framebuffer device */
-	compatible = parse_mode(si, &mode);
-	if (compatible) {
-		ret = create_simplefb(si, &mode);
-		if (!ret)
-			return 0;
-	}
-
-	/* if the FB is incompatible, create a legacy framebuffer device */
-	if (si->orig_video_isVGA == VIDEO_TYPE_EFI)
-		name = "efi-framebuffer";
-	else if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
-		name = "vesa-framebuffer";
-	else
-		name = "platform-framebuffer";
-
-	pd = platform_device_register_resndata(NULL, name, 0,
-					       NULL, 0, si, sizeof(*si));
-	return PTR_ERR_OR_ZERO(pd);
-}
-
-/* must execute after PCI subsystem for EFI quirks */
-device_initcall(sysfb_init);
diff --git a/arch/x86/kernel/sysfb_efi.c b/arch/x86/kernel/sysfb_efi.c
deleted file mode 100644
index 8a56a6d80098..000000000000
--- a/arch/x86/kernel/sysfb_efi.c
+++ /dev/null
@@ -1,284 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Generic System Framebuffers on x86
- * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
- *
- * EFI Quirks Copyright (c) 2006 Edgar Hucek <gimli@dark-green.com>
- */
-
-/*
- * EFI Quirks
- * Several EFI systems do not correctly advertise their boot framebuffers.
- * Hence, we use this static table of known broken machines and fix up the
- * information so framebuffer drivers can load correctly.
- */
-
-#include <linux/dmi.h>
-#include <linux/err.h>
-#include <linux/efi.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/pci.h>
-#include <linux/screen_info.h>
-#include <video/vga.h>
-
-#include <asm/efi.h>
-#include <asm/sysfb.h>
-
-enum {
-	OVERRIDE_NONE = 0x0,
-	OVERRIDE_BASE = 0x1,
-	OVERRIDE_STRIDE = 0x2,
-	OVERRIDE_HEIGHT = 0x4,
-	OVERRIDE_WIDTH = 0x8,
-};
-
-struct efifb_dmi_info efifb_dmi_list[] = {
-	[M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
-	[M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
-	[M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
-	[M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
-	[M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
-	[M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
-	[M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
-	[M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
-	[M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
-	[M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
-	[M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
-	[M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
-	[M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
-	[M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
-	[M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
-	/* 11" Macbook Air 3,1 passes the wrong stride */
-	[M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
-	[M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
-	[M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
-	[M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
-	[M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
-	[M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
-	[M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
-	[M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
-	[M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
-	[M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
-	[M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
-	[M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
-	[M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
-	[M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
-};
-
-void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
-{
-	int i;
-
-	for (i = 0; i < M_UNKNOWN; i++) {
-		if (efifb_dmi_list[i].base != 0 &&
-		    !strcmp(opt, efifb_dmi_list[i].optname)) {
-			si->lfb_base = efifb_dmi_list[i].base;
-			si->lfb_linelength = efifb_dmi_list[i].stride;
-			si->lfb_width = efifb_dmi_list[i].width;
-			si->lfb_height = efifb_dmi_list[i].height;
-		}
-	}
-}
-
-#define choose_value(dmivalue, fwvalue, field, flags) ({	\
-		typeof(fwvalue) _ret_ = fwvalue;		\
-		if ((flags) & (field))				\
-			_ret_ = dmivalue;			\
-		else if ((fwvalue) == 0)			\
-			_ret_ = dmivalue;			\
-		_ret_;						\
-	})
-
-static int __init efifb_set_system(const struct dmi_system_id *id)
-{
-	struct efifb_dmi_info *info = id->driver_data;
-
-	if (info->base == 0 && info->height == 0 && info->width == 0 &&
-	    info->stride == 0)
-		return 0;
-
-	/* Trust the bootloader over the DMI tables */
-	if (screen_info.lfb_base == 0) {
-#if defined(CONFIG_PCI)
-		struct pci_dev *dev = NULL;
-		int found_bar = 0;
-#endif
-		if (info->base) {
-			screen_info.lfb_base = choose_value(info->base,
-				screen_info.lfb_base, OVERRIDE_BASE,
-				info->flags);
-
-#if defined(CONFIG_PCI)
-			/* make sure that the address in the table is actually
-			 * on a VGA device's PCI BAR */
-
-			for_each_pci_dev(dev) {
-				int i;
-				if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
-					continue;
-				for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-					resource_size_t start, end;
-					unsigned long flags;
-
-					flags = pci_resource_flags(dev, i);
-					if (!(flags & IORESOURCE_MEM))
-						continue;
-
-					if (flags & IORESOURCE_UNSET)
-						continue;
-
-					if (pci_resource_len(dev, i) == 0)
-						continue;
-
-					start = pci_resource_start(dev, i);
-					end = pci_resource_end(dev, i);
-					if (screen_info.lfb_base >= start &&
-					    screen_info.lfb_base < end) {
-						found_bar = 1;
-						break;
-					}
-				}
-			}
-			if (!found_bar)
-				screen_info.lfb_base = 0;
-#endif
-		}
-	}
-	if (screen_info.lfb_base) {
-		screen_info.lfb_linelength = choose_value(info->stride,
-			screen_info.lfb_linelength, OVERRIDE_STRIDE,
-			info->flags);
-		screen_info.lfb_width = choose_value(info->width,
-			screen_info.lfb_width, OVERRIDE_WIDTH,
-			info->flags);
-		screen_info.lfb_height = choose_value(info->height,
-			screen_info.lfb_height, OVERRIDE_HEIGHT,
-			info->flags);
-		if (screen_info.orig_video_isVGA == 0)
-			screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
-	} else {
-		screen_info.lfb_linelength = 0;
-		screen_info.lfb_width = 0;
-		screen_info.lfb_height = 0;
-		screen_info.orig_video_isVGA = 0;
-		return 0;
-	}
-
-	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
-			 "(%dx%d, stride %d)\n", id->ident,
-			 screen_info.lfb_base, screen_info.lfb_width,
-			 screen_info.lfb_height, screen_info.lfb_linelength);
-
-	return 1;
-}
-
-#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)		\
-	{							\
-		efifb_set_system,				\
-		name,						\
-		{						\
-			DMI_MATCH(DMI_BIOS_VENDOR, vendor),	\
-			DMI_MATCH(DMI_PRODUCT_NAME, name)	\
-		},						\
-		&efifb_dmi_list[enumid]				\
-	}
-
-static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
-	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 Inc.", "iMac8,1", M_I24_8_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
-	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.", "MacBook5,1", M_MB_5_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
-	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 Computer, Inc.", "MacBookPro2,2", M_MBP_2_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),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
-	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
-	{},
-};
-
-/*
- * Some devices have a portrait LCD but advertise a landscape resolution (and
- * pitch). We simply swap width and height for these devices so that we can
- * correctly deal with some of them coming with multiple resolutions.
- */
-static const struct dmi_system_id efifb_dmi_swap_width_height[] __initconst = {
-	{
-		/*
-		 * Lenovo MIIX310-10ICR, only some batches have the troublesome
-		 * 800x1280 portrait screen. Luckily the portrait version has
-		 * its own BIOS version, so we match on that.
-		 */
-		.matches = {
-			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "MIIX 310-10ICR"),
-			DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1HCN44WW"),
-		},
-	},
-	{
-		/* Lenovo MIIX 320-10ICR with 800x1280 portrait screen */
-		.matches = {
-			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
-					"Lenovo MIIX 320-10ICR"),
-		},
-	},
-	{
-		/* Lenovo D330 with 800x1280 or 1200x1920 portrait screen */
-		.matches = {
-			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-			DMI_EXACT_MATCH(DMI_PRODUCT_VERSION,
-					"Lenovo ideapad D330-10IGM"),
-		},
-	},
-	{},
-};
-
-__init void sysfb_apply_efi_quirks(void)
-{
-	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
-	    !(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
-		dmi_check_system(efifb_dmi_system_table);
-
-	if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
-	    dmi_check_system(efifb_dmi_swap_width_height)) {
-		u16 temp = screen_info.lfb_width;
-
-		screen_info.lfb_width = screen_info.lfb_height;
-		screen_info.lfb_height = temp;
-		screen_info.lfb_linelength = 4 * screen_info.lfb_width;
-	}
-}
diff --git a/arch/x86/kernel/sysfb_simplefb.c b/arch/x86/kernel/sysfb_simplefb.c
deleted file mode 100644
index 298fc1edd9c9..000000000000
--- a/arch/x86/kernel/sysfb_simplefb.c
+++ /dev/null
@@ -1,111 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Generic System Framebuffers on x86
- * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
- */
-
-/*
- * simple-framebuffer probing
- * Try to convert "screen_info" into a "simple-framebuffer" compatible mode.
- * If the mode is incompatible, we return "false" and let the caller create
- * legacy nodes instead.
- */
-
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/platform_data/simplefb.h>
-#include <linux/platform_device.h>
-#include <linux/screen_info.h>
-#include <asm/sysfb.h>
-
-static const char simplefb_resname[] = "BOOTFB";
-static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
-
-/* try parsing x86 screen_info into a simple-framebuffer mode struct */
-__init bool parse_mode(const struct screen_info *si,
-		       struct simplefb_platform_data *mode)
-{
-	const struct simplefb_format *f;
-	__u8 type;
-	unsigned int i;
-
-	type = si->orig_video_isVGA;
-	if (type != VIDEO_TYPE_VLFB && type != VIDEO_TYPE_EFI)
-		return false;
-
-	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
-		f = &formats[i];
-		if (si->lfb_depth == f->bits_per_pixel &&
-		    si->red_size == f->red.length &&
-		    si->red_pos == f->red.offset &&
-		    si->green_size == f->green.length &&
-		    si->green_pos == f->green.offset &&
-		    si->blue_size == f->blue.length &&
-		    si->blue_pos == f->blue.offset &&
-		    si->rsvd_size == f->transp.length &&
-		    si->rsvd_pos == f->transp.offset) {
-			mode->format = f->name;
-			mode->width = si->lfb_width;
-			mode->height = si->lfb_height;
-			mode->stride = si->lfb_linelength;
-			return true;
-		}
-	}
-
-	return false;
-}
-
-__init int create_simplefb(const struct screen_info *si,
-			   const struct simplefb_platform_data *mode)
-{
-	struct platform_device *pd;
-	struct resource res;
-	u64 base, size;
-	u32 length;
-
-	/*
-	 * If the 64BIT_BASE capability is set, ext_lfb_base will contain the
-	 * upper half of the base address. Assemble the address, then make sure
-	 * it is valid and we can actually access it.
-	 */
-	base = si->lfb_base;
-	if (si->capabilities & VIDEO_CAPABILITY_64BIT_BASE)
-		base |= (u64)si->ext_lfb_base << 32;
-	if (!base || (u64)(resource_size_t)base != base) {
-		printk(KERN_DEBUG "sysfb: inaccessible VRAM base\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * Don't use lfb_size as IORESOURCE size, since it may contain the
-	 * entire VMEM, and thus require huge mappings. Use just the part we
-	 * need, that is, the part where the framebuffer is located. But verify
-	 * that it does not exceed the advertised VMEM.
-	 * Note that in case of VBE, the lfb_size is shifted by 16 bits for
-	 * historical reasons.
-	 */
-	size = si->lfb_size;
-	if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
-		size <<= 16;
-	length = mode->height * mode->stride;
-	if (length > size) {
-		printk(KERN_WARNING "sysfb: VRAM smaller than advertised\n");
-		return -EINVAL;
-	}
-	length = PAGE_ALIGN(length);
-
-	/* setup IORESOURCE_MEM as framebuffer memory */
-	memset(&res, 0, sizeof(res));
-	res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
-	res.name = simplefb_resname;
-	res.start = base;
-	res.end = res.start + length - 1;
-	if (res.end <= res.start)
-		return -EINVAL;
-
-	pd = platform_device_register_resndata(NULL, "simple-framebuffer", 0,
-					       &res, 1, mode, sizeof(*mode));
-	return PTR_ERR_OR_ZERO(pd);
-}