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/*
* linux/drivers/video/cfb4.c -- Low level frame buffer operations for 4 bpp
* packed pixels
*
* Created 26 Dec 1997 by Michael Schmitz
* Based on the old macfb.c 4bpp code by Alan Cox
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/module.h>
#include <linux/tty.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <video/fbcon.h>
#include <video/fbcon-cfb4.h>
/*
* 4 bpp packed pixels
*/
/*
* IFF the font is even pixel aligned (that is to say each
* character start is a byte start in the pixel pairs). That
* avoids us having to mask bytes and means we won't be here
* all week. On a MacII that matters _lots_
*/
static u16 nibbletab_cfb4[] = {
#if defined(__BIG_ENDIAN)
0x0000,0x000f,0x00f0,0x00ff,
0x0f00,0x0f0f,0x0ff0,0x0fff,
0xf000,0xf00f,0xf0f0,0xf0ff,
0xff00,0xff0f,0xfff0,0xffff
#elif defined(__LITTLE_ENDIAN)
0x0000,0xf000,0x0f00,0xff00,
0x00f0,0xf0f0,0x0ff0,0xfff0,
0x000f,0xf00f,0x0f0f,0xff0f,
0x00ff,0xf0ff,0x0fff,0xffff
#else
#error FIXME: No endianness??
#endif
};
void fbcon_cfb4_setup(struct display *p)
{
p->next_line = p->line_length ? p->line_length : p->var.xres_virtual>>1;
p->next_plane = 0;
}
void fbcon_cfb4_bmove(struct display *p, int sy, int sx, int dy, int dx,
int height, int width)
{
int bytes = p->next_line, linesize = bytes * fontheight(p), rows;
u8 *src,*dst;
if (sx == 0 && dx == 0 && width * 4 == bytes) {
fb_memmove(p->screen_base + dy * linesize,
p->screen_base + sy * linesize,
height * linesize);
}
else {
if (dy < sy || (dy == sy && dx < sx)) {
src = p->screen_base + sy * linesize + sx * 4;
dst = p->screen_base + dy * linesize + dx * 4;
for (rows = height * fontheight(p) ; rows-- ;) {
fb_memmove(dst, src, width * 4);
src += bytes;
dst += bytes;
}
}
else {
src = p->screen_base + (sy+height) * linesize + sx * 4
- bytes;
dst = p->screen_base + (dy+height) * linesize + dx * 4
- bytes;
for (rows = height * fontheight(p) ; rows-- ;) {
fb_memmove(dst, src, width * 4);
src -= bytes;
dst -= bytes;
}
}
}
}
void fbcon_cfb4_clear(struct vc_data *conp, struct display *p, int sy, int sx,
int height, int width)
{
u8 *dest0,*dest;
int bytes=p->next_line,lines=height * fontheight(p), rows, i;
u32 bgx;
/* if(p->screen_base!=0xFDD00020)
mac_boom(1);*/
dest = p->screen_base + sy * fontheight(p) * bytes + sx * 4;
bgx=attr_bgcol_ec(p,conp);
bgx |= (bgx << 4); /* expand the colour to 32bits */
bgx |= (bgx << 8);
bgx |= (bgx << 16);
if (sx == 0 && width * 4 == bytes) {
for (i = 0 ; i < lines * width ; i++) {
fb_writel (bgx, dest);
dest+=4;
}
} else {
dest0=dest;
for (rows = lines; rows-- ; dest0 += bytes) {
dest=dest0;
for (i = 0 ; i < width ; i++) {
/* memset ?? */
fb_writel (bgx, dest);
dest+=4;
}
}
}
}
void fbcon_cfb4_putc(struct vc_data *conp, struct display *p, int c, int yy,
int xx)
{
u8 *dest,*cdat;
int bytes=p->next_line,rows;
u32 eorx,fgx,bgx;
dest = p->screen_base + yy * fontheight(p) * bytes + xx * 4;
cdat = p->fontdata + (c & p->charmask) * fontheight(p);
fgx=attr_fgcol(p,c);
bgx=attr_bgcol(p,c);
fgx |= (fgx << 4);
fgx |= (fgx << 8);
bgx |= (bgx << 4);
bgx |= (bgx << 8);
eorx = fgx ^ bgx;
for (rows = fontheight(p) ; rows-- ; dest += bytes) {
fb_writew((nibbletab_cfb4[*cdat >> 4] & eorx) ^ bgx, dest+0);
fb_writew((nibbletab_cfb4[*cdat++ & 0xf] & eorx) ^ bgx, dest+2);
}
}
void fbcon_cfb4_putcs(struct vc_data *conp, struct display *p,
const unsigned short *s, int count, int yy, int xx)
{
u8 *cdat, *dest, *dest0;
u16 c;
int rows,bytes=p->next_line;
u32 eorx, fgx, bgx;
dest0 = p->screen_base + yy * fontheight(p) * bytes + xx * 4;
fgx=attr_fgcol(p,scr_readw(s));
bgx=attr_bgcol(p,scr_readw(s));
fgx |= (fgx << 4);
fgx |= (fgx << 8);
fgx |= (fgx << 16);
bgx |= (bgx << 4);
bgx |= (bgx << 8);
bgx |= (bgx << 16);
eorx = fgx ^ bgx;
while (count--) {
c = scr_readw(s++) & p->charmask;
cdat = p->fontdata + c * fontheight(p);
for (rows = fontheight(p), dest = dest0; rows-- ; dest += bytes) {
fb_writew((nibbletab_cfb4[*cdat >> 4] & eorx) ^ bgx, dest+0);
fb_writew((nibbletab_cfb4[*cdat++ & 0xf] & eorx) ^ bgx, dest+2);
}
dest0+=4;
}
}
void fbcon_cfb4_revc(struct display *p, int xx, int yy)
{
u8 *dest;
int bytes=p->next_line, rows;
dest = p->screen_base + yy * fontheight(p) * bytes + xx * 4;
for (rows = fontheight(p) ; rows-- ; dest += bytes) {
fb_writel(fb_readl(dest+0) ^ 0xffffffff, dest+0);
}
}
/*
* `switch' for the low level operations
*/
struct display_switch fbcon_cfb4 = {
setup: fbcon_cfb4_setup,
bmove: fbcon_cfb4_bmove,
clear: fbcon_cfb4_clear,
putc: fbcon_cfb4_putc,
putcs: fbcon_cfb4_putcs,
revc: fbcon_cfb4_revc,
fontwidthmask: FONTWIDTH(8)
};
#ifdef MODULE
int init_module(void)
{
return 0;
}
void cleanup_module(void)
{}
#endif /* MODULE */
/*
* Visible symbols for modules
*/
EXPORT_SYMBOL(fbcon_cfb4);
EXPORT_SYMBOL(fbcon_cfb4_setup);
EXPORT_SYMBOL(fbcon_cfb4_bmove);
EXPORT_SYMBOL(fbcon_cfb4_clear);
EXPORT_SYMBOL(fbcon_cfb4_putc);
EXPORT_SYMBOL(fbcon_cfb4_putcs);
EXPORT_SYMBOL(fbcon_cfb4_revc);
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