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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Generic System Framebuffers on x86
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* Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
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*/
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/*
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* simple-framebuffer probing
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* Try to convert "screen_info" into a "simple-framebuffer" compatible mode.
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* If the mode is incompatible, we return "false" and let the caller create
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* legacy nodes instead.
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/platform_data/simplefb.h>
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#include <linux/platform_device.h>
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#include <linux/screen_info.h>
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#include <asm/sysfb.h>
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static const char simplefb_resname[] = "BOOTFB";
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static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
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/* try parsing x86 screen_info into a simple-framebuffer mode struct */
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__init bool parse_mode(const struct screen_info *si,
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struct simplefb_platform_data *mode)
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{
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const struct simplefb_format *f;
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__u8 type;
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unsigned int i;
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type = si->orig_video_isVGA;
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if (type != VIDEO_TYPE_VLFB && type != VIDEO_TYPE_EFI)
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return false;
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for (i = 0; i < ARRAY_SIZE(formats); ++i) {
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f = &formats[i];
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if (si->lfb_depth == f->bits_per_pixel &&
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si->red_size == f->red.length &&
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si->red_pos == f->red.offset &&
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si->green_size == f->green.length &&
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si->green_pos == f->green.offset &&
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si->blue_size == f->blue.length &&
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si->blue_pos == f->blue.offset &&
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si->rsvd_size == f->transp.length &&
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si->rsvd_pos == f->transp.offset) {
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mode->format = f->name;
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mode->width = si->lfb_width;
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mode->height = si->lfb_height;
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mode->stride = si->lfb_linelength;
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return true;
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}
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}
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return false;
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}
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__init int create_simplefb(const struct screen_info *si,
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const struct simplefb_platform_data *mode)
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{
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struct platform_device *pd;
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struct resource res;
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u64 base, size;
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u32 length;
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/*
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* If the 64BIT_BASE capability is set, ext_lfb_base will contain the
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* upper half of the base address. Assemble the address, then make sure
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* it is valid and we can actually access it.
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*/
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base = si->lfb_base;
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if (si->capabilities & VIDEO_CAPABILITY_64BIT_BASE)
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base |= (u64)si->ext_lfb_base << 32;
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if (!base || (u64)(resource_size_t)base != base) {
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printk(KERN_DEBUG "sysfb: inaccessible VRAM base\n");
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return -EINVAL;
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}
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/*
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* Don't use lfb_size as IORESOURCE size, since it may contain the
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* entire VMEM, and thus require huge mappings. Use just the part we
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* need, that is, the part where the framebuffer is located. But verify
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* that it does not exceed the advertised VMEM.
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* Note that in case of VBE, the lfb_size is shifted by 16 bits for
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* historical reasons.
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*/
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size = si->lfb_size;
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if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
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size <<= 16;
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length = mode->height * mode->stride;
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length = PAGE_ALIGN(length);
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if (length > size) {
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printk(KERN_WARNING "sysfb: VRAM smaller than advertised\n");
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return -EINVAL;
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}
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/* setup IORESOURCE_MEM as framebuffer memory */
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memset(&res, 0, sizeof(res));
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res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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res.name = simplefb_resname;
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res.start = base;
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res.end = res.start + length - 1;
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if (res.end <= res.start)
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return -EINVAL;
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pd = platform_device_register_resndata(NULL, "simple-framebuffer", 0,
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&res, 1, mode, sizeof(*mode));
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return PTR_ERR_OR_ZERO(pd);
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}
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