/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2016 Noralf Trønnes
*
* 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.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_rect.h>
static unsigned int clip_offset(struct drm_rect *clip,
unsigned int pitch, unsigned int cpp)
{
return clip->y1 * pitch + clip->x1 * cpp;
}
/**
* drm_fb_memcpy - Copy clip buffer
* @dst: Destination buffer
* @vaddr: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function does not apply clipping on dst, i.e. the destination
* is a small buffer containing the clip rect only.
*/
void drm_fb_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
unsigned int cpp = fb->format->cpp[0];
size_t len = (clip->x2 - clip->x1) * cpp;
unsigned int y, lines = clip->y2 - clip->y1;
vaddr += clip_offset(clip, fb->pitches[0], cpp);
for (y = 0; y < lines; y++) {
memcpy(dst, vaddr, len);
vaddr += fb->pitches[0];
dst += len;
}
}
EXPORT_SYMBOL(drm_fb_memcpy);
/**
* drm_fb_memcpy_dstclip - Copy clip buffer
* @dst: Destination buffer (iomem)
* @vaddr: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function applies clipping on dst, i.e. the destination is a
* full (iomem) framebuffer but only the clip rect content is copied over.
*/
void drm_fb_memcpy_dstclip(void __iomem *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_rect *clip)
{
unsigned int cpp = fb->format->cpp[0];
unsigned int offset = clip_offset(clip, fb->pitches[0], cpp);
size_t len = (clip->x2 - clip->x1) * cpp;
unsigned int y, lines = clip->y2 - clip->y1;
vaddr += offset;
dst += offset;
for (y = 0; y < lines; y++) {
memcpy_toio(dst, vaddr, len);
vaddr += fb->pitches[0];
dst += fb->pitches[0];
}
}
EXPORT_SYMBOL(drm_fb_memcpy_dstclip);
/**
* drm_fb_swab16 - Swap bytes into clip buffer
* @dst: RGB565 destination buffer
* @vaddr: RGB565 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*/
void drm_fb_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
size_t len = (clip->x2 - clip->x1) * sizeof(u16);
unsigned int x, y;
u16 *src, *buf;
/*
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*/
buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return;
for (y = clip->y1; y < clip->y2; y++) {
src = vaddr + (y * fb->pitches[0]);
src += clip->x1;
memcpy(buf, src, len);
src = buf;
for (x = clip->x1; x < clip->x2; x++)
*dst++ = swab16(*src++);
}
kfree(buf);
}
EXPORT_SYMBOL(drm_fb_swab16);
static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, u32 *sbuf,
unsigned int pixels,
bool swab)
{
unsigned int x;
u16 val16;
for (x = 0; x < pixels; x++) {
val16 = ((sbuf[x] & 0x00F80000) >> 8) |
((sbuf[x] & 0x0000FC00) >> 5) |
((sbuf[x] & 0x000000F8) >> 3);
if (swab)
dbuf[x] = swab16(val16);
else
dbuf[x] = val16;
}
}
/**
* drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
* @dst: RGB565 destination buffer
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
* @swab: Swap bytes
*
* Drivers can use this function for RGB565 devices that don't natively
* support XRGB8888.
*
* This function does not apply clipping on dst, i.e. the destination
* is a small buffer containing the clip rect only.
*/
void drm_fb_xrgb8888_to_rgb565(void *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_rect *clip, bool swab)
{
size_t linepixels = clip->x2 - clip->x1;
size_t src_len = linepixels * sizeof(u32);
size_t dst_len = linepixels * sizeof(u16);
unsigned y, lines = clip->y2 - clip->y1;
void *sbuf;
/*
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*/
sbuf = kmalloc(src_len, GFP_KERNEL);
if (!sbuf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < lines; y++) {
memcpy(sbuf, vaddr, src_len);
drm_fb_xrgb8888_to_rgb565_line(dst, sbuf, linepixels, swab);
vaddr += fb->pitches[0];
dst += dst_len;
}
kfree(sbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
/**
* drm_fb_xrgb8888_to_rgb565_dstclip - Convert XRGB8888 to RGB565 clip buffer
* @dst: RGB565 destination buffer (iomem)
* @dst_pitch: destination buffer pitch
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
* @swab: Swap bytes
*
* Drivers can use this function for RGB565 devices that don't natively
* support XRGB8888.
*
* This function applies clipping on dst, i.e. the destination is a
* full (iomem) framebuffer but only the clip rect content is copied over.
*/
void drm_fb_xrgb8888_to_rgb565_dstclip(void __iomem *dst, unsigned int dst_pitch,
void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip, bool swab)
{
size_t linepixels = clip->x2 - clip->x1;
size_t dst_len = linepixels * sizeof(u16);
unsigned y, lines = clip->y2 - clip->y1;
void *dbuf;
dbuf = kmalloc(dst_len, GFP_KERNEL);
if (!dbuf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
dst += clip_offset(clip, dst_pitch, sizeof(u16));
for (y = 0; y < lines; y++) {
drm_fb_xrgb8888_to_rgb565_line(dbuf, vaddr, linepixels, swab);
memcpy_toio(dst, dbuf, dst_len);
vaddr += fb->pitches[0];
dst += dst_len;
}
kfree(dbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);
static void drm_fb_xrgb8888_to_rgb888_line(u8 *dbuf, u32 *sbuf,
unsigned int pixels)
{
unsigned int x;
for (x = 0; x < pixels; x++) {
*dbuf++ = (sbuf[x] & 0x000000FF) >> 0;
*dbuf++ = (sbuf[x] & 0x0000FF00) >> 8;
*dbuf++ = (sbuf[x] & 0x00FF0000) >> 16;
}
}
/**
* drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer
* @dst: RGB565 destination buffer (iomem)
* @dst_pitch: destination buffer pitch
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drivers can use this function for RGB888 devices that don't natively
* support XRGB8888.
*
* This function applies clipping on dst, i.e. the destination is a
* full (iomem) framebuffer but only the clip rect content is copied over.
*/
void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch,
void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
size_t linepixels = clip->x2 - clip->x1;
size_t dst_len = linepixels * 3;
unsigned y, lines = clip->y2 - clip->y1;
void *dbuf;
dbuf = kmalloc(dst_len, GFP_KERNEL);
if (!dbuf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
dst += clip_offset(clip, dst_pitch, sizeof(u16));
for (y = 0; y < lines; y++) {
drm_fb_xrgb8888_to_rgb888_line(dbuf, vaddr, linepixels);
memcpy_toio(dst, dbuf, dst_len);
vaddr += fb->pitches[0];
dst += dst_len;
}
kfree(dbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip);
/**
* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
* @dst: 8-bit grayscale destination buffer
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drm doesn't have native monochrome or grayscale support.
* Such drivers can announce the commonly supported XR24 format to userspace
* and use this function to convert to the native format.
*
* Monochrome drivers will use the most significant bit,
* where 1 means foreground color and 0 background color.
*
* ITU BT.601 is used for the RGB -> luma (brightness) conversion.
*/
void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
struct drm_rect *clip)
{
unsigned int len = (clip->x2 - clip->x1) * sizeof(u32);
unsigned int x, y;
void *buf;
u32 *src;
if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888))
return;
/*
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*/
buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return;
for (y = clip->y1; y < clip->y2; y++) {
src = vaddr + (y * fb->pitches[0]);
src += clip->x1;
memcpy(buf, src, len);
src = buf;
for (x = clip->x1; x < clip->x2; x++) {
u8 r = (*src & 0x00ff0000) >> 16;
u8 g = (*src & 0x0000ff00) >> 8;
u8 b = *src & 0x000000ff;
/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
*dst++ = (3 * r + 6 * g + b) / 10;
src++;
}
}
kfree(buf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
