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/*
* linux/drivers/video/fbcon-iplan2p4.c -- Low level frame buffer operations
* for interleaved bitplanes à la Atari (4
* planes, 2 bytes interleave)
*
* Created 5 Apr 1997 by Geert Uytterhoeven
*
* 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 <asm/byteorder.h>
#ifdef __mc68000__
#include <asm/setup.h>
#endif
#include <video/fbcon.h>
#include <video/fbcon-iplan2p4.h>
/*
* Interleaved bitplanes à la Atari (4 planes, 2 bytes interleave)
*/
/* Increment/decrement 4 plane addresses */
#define INC_4P(p) do { if (!((long)(++(p)) & 1)) (p) += 6; } while(0)
#define DEC_4P(p) do { if ((long)(--(p)) & 1) (p) -= 6; } while(0)
/* Perform the m68k movepl operation. */
static inline void movepl(u8 *d, u32 val)
{
#if defined __mc68000__ && !defined CPU_M68060_ONLY
asm volatile ("movepl %1,%0@(0)" : : "a" (d), "d" (val));
#else
d[0] = (val >> 24) & 0xff;
d[2] = (val >> 16) & 0xff;
d[4] = (val >> 8) & 0xff;
d[6] = val & 0xff;
#endif
}
/* Sets the bytes in the visible column at d, height h, to the value
* val for a 4 plane screen. The bits of the color in 'color' are
* moved (8 times) to the respective bytes. This means:
*
* for(h times; d += bpr)
* *d = (color & 1) ? 0xff : 0;
* *(d+2) = (color & 2) ? 0xff : 0;
* *(d+4) = (color & 4) ? 0xff : 0;
* *(d+6) = (color & 8) ? 0xff : 0;
*/
static __inline__ void memclear_4p_col(void *d, size_t h, u32 val, int bpr)
{
u8 *dd = d;
do {
movepl(dd, val);
dd += bpr;
} while (--h);
}
/* Sets a 4 plane region from 'd', length 'count' bytes, to the color
* in val1/val2. 'd' has to be an even address and count must be divisible
* by 8, because only whole words and all planes are accessed. I.e.:
*
* for(count/8 times)
* *d = *(d+1) = (color & 1) ? 0xff : 0;
* *(d+2) = *(d+3) = (color & 2) ? 0xff : 0;
* *(d+4) = *(d+5) = (color & 4) ? 0xff : 0;
* *(d+6) = *(d+7) = (color & 8) ? 0xff : 0;
*/
static __inline__ void memset_even_4p(void *d, size_t count, u32 val1,
u32 val2)
{
u32 *dd = d;
count /= 8;
while (count--) {
*dd++ = val1;
*dd++ = val2;
}
}
/* Copies a 4 plane column from 's', height 'h', to 'd'. */
static __inline__ void memmove_4p_col (void *d, void *s, int h, int bpr)
{
u8 *dd = d, *ss = s;
while (h--) {
dd[0] = ss[0];
dd[2] = ss[2];
dd[4] = ss[4];
dd[6] = ss[6];
dd += bpr;
ss += bpr;
}
}
/* This expands a 4 bit color into a long for movepl (4 plane) operations. */
static const u32 four2byte[] = {
0x00000000, 0xff000000, 0x00ff0000, 0xffff0000,
0x0000ff00, 0xff00ff00, 0x00ffff00, 0xffffff00,
0x000000ff, 0xff0000ff, 0x00ff00ff, 0xffff00ff,
0x0000ffff, 0xff00ffff, 0x00ffffff, 0xffffffff
};
static __inline__ u32 expand4l(u8 c)
{
return four2byte[c];
}
/* This expands a 4 bit color into two longs for two movel operations
* (4 planes).
*/
static const u32 two2word[] = {
#ifndef __LITTLE_ENDIAN
0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff,
#else
0x00000000, 0x0000ffff, 0xffff0000, 0xffffffff,
#endif
};
static __inline__ void expand4dl(u8 c, u32 *ret1, u32 *ret2)
{
*ret1 = two2word[c & 3];
*ret2 = two2word[c >> 2];
}
/* This duplicates a byte 4 times into a long. */
static __inline__ u32 dup4l(u8 c)
{
u32 rv;
rv = c;
rv |= rv << 8;
rv |= rv << 16;
return rv;
}
void fbcon_iplan2p4_setup(struct display *p)
{
p->next_line = p->var.xres_virtual>>1;
p->next_plane = 2;
}
void fbcon_iplan2p4_bmove(struct display *p, int sy, int sx, int dy, int dx,
int height, int width)
{
/* bmove() has to distinguish two major cases: If both, source and
* destination, start at even addresses or both are at odd
* addresses, just the first odd and last even column (if present)
* require special treatment (memmove_col()). The rest between
* then can be copied by normal operations, because all adjacent
* bytes are affected and are to be stored in the same order.
* The pathological case is when the move should go from an odd
* address to an even or vice versa. Since the bytes in the plane
* words must be assembled in new order, it seems wisest to make
* all movements by memmove_col().
*/
if (sx == 0 && dx == 0 && width * 4 == p->next_line) {
/* Special (but often used) case: Moving whole lines can be
*done with memmove()
*/
fb_memmove(p->screen_base + dy * p->next_line * fontheight(p),
p->screen_base + sy * p->next_line * fontheight(p),
p->next_line * height * fontheight(p));
} else {
int rows, cols;
u8 *src;
u8 *dst;
int bytes = p->next_line;
int linesize;
u_int colsize;
u_int upwards = (dy < sy) || (dy == sy && dx < sx);
if (fontheightlog(p)) {
linesize = bytes << fontheightlog(p);
colsize = height << fontheightlog(p);
} else {
linesize = bytes * fontheight(p);
colsize = height * fontheight(p);
}
if ((sx & 1) == (dx & 1)) {
/* odd->odd or even->even */
if (upwards) {
src = p->screen_base + sy * linesize + (sx>>1)*8 + (sx & 1);
dst = p->screen_base + dy * linesize + (dx>>1)*8 + (dx & 1);
if (sx & 1) {
memmove_4p_col(dst, src, colsize, bytes);
src += 7;
dst += 7;
--width;
}
if (width > 1) {
for(rows = colsize; rows > 0; --rows) {
fb_memmove(dst, src, (width>>1)*8);
src += bytes;
dst += bytes;
}
}
if (width & 1) {
src -= colsize * bytes;
dst -= colsize * bytes;
memmove_4p_col(dst + (width>>1)*8, src + (width>>1)*8,
colsize, bytes);
}
} else {
if (!((sx+width-1) & 1)) {
src = p->screen_base + sy * linesize + ((sx+width-1)>>1)*8;
dst = p->screen_base + dy * linesize + ((dx+width-1)>>1)*8;
memmove_4p_col(dst, src, colsize, bytes);
--width;
}
src = p->screen_base + sy * linesize + (sx>>1)*8 + (sx & 1);
dst = p->screen_base + dy * linesize + (dx>>1)*8 + (dx & 1);
if (width > 1) {
src += colsize * bytes + (sx & 1)*7;
dst += colsize * bytes + (sx & 1)*7;
for(rows = colsize; rows > 0; --rows) {
src -= bytes;
dst -= bytes;
fb_memmove(dst, src, (width>>1)*8);
}
}
if (width & 1) {
memmove_4p_col(dst-7, src-7, colsize, bytes);
}
}
} else {
/* odd->even or even->odd */
if (upwards) {
src = p->screen_base + sy * linesize + (sx>>1)*8 + (sx & 1);
dst = p->screen_base + dy * linesize + (dx>>1)*8 + (dx & 1);
for(cols = width; cols > 0; --cols) {
memmove_4p_col(dst, src, colsize, bytes);
INC_4P(src);
INC_4P(dst);
}
} else {
sx += width-1;
dx += width-1;
src = p->screen_base + sy * linesize + (sx>>1)*8 + (sx & 1);
dst = p->screen_base + dy * linesize + (dx>>1)*8 + (dx & 1);
for(cols = width; cols > 0; --cols) {
memmove_4p_col(dst, src, colsize, bytes);
DEC_4P(src);
DEC_4P(dst);
}
}
}
}
}
void fbcon_iplan2p4_clear(struct vc_data *conp, struct display *p, int sy,
int sx, int height, int width)
{
u32 offset;
u8 *start;
int rows;
int bytes = p->next_line;
int lines;
u32 size;
u32 cval1, cval2, pcval;
expand4dl(attr_bgcol_ec(p,conp), &cval1, &cval2);
if (fontheightlog(p))
lines = height << fontheightlog(p);
else
lines = height * fontheight(p);
if (sx == 0 && width * 4 == bytes) {
if (fontheightlog(p))
offset = (sy * bytes) << fontheightlog(p);
else
offset = sy * bytes * fontheight(p);
size = lines * bytes;
memset_even_4p(p->screen_base+offset, size, cval1, cval2);
} else {
if (fontheightlog(p))
offset = ((sy * bytes) << fontheightlog(p)) + (sx>>1)*8 + (sx & 1);
else
offset = sy * bytes * fontheight(p) + (sx>>1)*8 + (sx & 1);
start = p->screen_base + offset;
pcval = expand4l(attr_bgcol_ec(p,conp));
/* Clears are split if the region starts at an odd column or
* end at an even column. These extra columns are spread
* across the interleaved planes. All in between can be
* cleared by normal fb_memclear_small(), because both bytes of
* the single plane words are affected.
*/
if (sx & 1) {
memclear_4p_col(start, lines, pcval, bytes);
start += 7;
width--;
}
if (width & 1) {
memclear_4p_col(start + (width>>1)*8, lines, pcval, bytes);
width--;
}
if (width) {
for(rows = lines; rows-- ; start += bytes)
memset_even_4p(start, width*4, cval1, cval2);
}
}
}
void fbcon_iplan2p4_putc(struct vc_data *conp, struct display *p, int c,
int yy, int xx)
{
u8 *dest;
u8 *cdat;
int rows;
int bytes = p->next_line;
u32 eorx, fgx, bgx, fdx;
if (fontheightlog(p)) {
dest = (p->screen_base + ((yy * bytes) << fontheightlog(p)) +
(xx>>1)*8 + (xx & 1));
cdat = p->fontdata + ((c & p->charmask) << fontheightlog(p));
} else {
dest = (p->screen_base + yy * bytes * fontheight(p) +
(xx>>1)*8 + (xx & 1));
cdat = p->fontdata + (c & p->charmask) * fontheight(p);
}
fgx = expand4l(attr_fgcol(p,c));
bgx = expand4l(attr_bgcol(p,c));
eorx = fgx ^ bgx;
for(rows = fontheight(p) ; rows-- ; dest += bytes) {
fdx = dup4l(*cdat++);
movepl(dest, (fdx & eorx) ^ bgx);
}
}
void fbcon_iplan2p4_putcs(struct vc_data *conp, struct display *p,
const unsigned short *s, int count, int yy, int xx)
{
u8 *dest, *dest0;
u8 *cdat;
u16 c;
int rows;
int bytes;
u32 eorx, fgx, bgx, fdx;
bytes = p->next_line;
if (fontheightlog(p))
dest0 = (p->screen_base + ((yy * bytes) << fontheightlog(p)) +
(xx>>1)*8 + (xx & 1));
else
dest0 = (p->screen_base + yy * bytes * fontheight(p) +
(xx>>1)*8 + (xx & 1));
c = scr_readw(s);
fgx = expand4l(attr_fgcol(p, c));
bgx = expand4l(attr_bgcol(p, c));
eorx = fgx ^ bgx;
while (count--) {
/* I think, unrolling the loops like in the 1 plane case isn't
* practicable here, because the body is much longer for 4
* planes (mostly the dup4l()). I guess, unrolling this would
* need more than 256 bytes and so exceed the instruction
* cache :-(
*/
c = scr_readw(s++) & p->charmask;
if (fontheightlog(p))
cdat = p->fontdata + (c << fontheightlog(p));
else
cdat = p->fontdata + c * fontheight(p);
for(rows = fontheight(p), dest = dest0; rows-- ; dest += bytes) {
fdx = dup4l(*cdat++);
movepl(dest, (fdx & eorx) ^ bgx);
}
INC_4P(dest0);
}
}
void fbcon_iplan2p4_revc(struct display *p, int xx, int yy)
{
u8 *dest;
int j;
int bytes;
if (fontheightlog(p))
dest = (p->screen_base + ((yy * p->next_line) << fontheightlog(p)) +
(xx>>1)*8 + (xx & 1));
else
dest = (p->screen_base + yy * p->next_line * fontheight(p) +
(xx>>1)*8 + (xx & 1));
j = fontheight(p);
bytes = p->next_line;
while (j--) {
/* This should really obey the individual character's
* background and foreground colors instead of simply
* inverting.
*/
dest[0] = ~dest[0];
dest[2] = ~dest[2];
dest[4] = ~dest[4];
dest[6] = ~dest[6];
dest += bytes;
}
}
void fbcon_iplan2p4_clear_margins(struct vc_data *conp, struct display *p,
int bottom_only)
{
u32 offset;
int bytes;
int lines;
u32 cval1, cval2;
/* No need to handle right margin, cannot occur with fontwidth == 8 */
bytes = p->next_line;
if (fontheightlog(p)) {
lines = p->var.yres - (conp->vc_rows << fontheightlog(p));
offset = ((p->yscroll + conp->vc_rows) * bytes) << fontheightlog(p);
} else {
lines = p->var.yres - conp->vc_rows * fontheight(p);
offset = (p->yscroll + conp->vc_rows) * bytes * fontheight(p);
}
if (lines) {
expand4dl(attr_bgcol_ec(p,conp), &cval1, &cval2);
memset_even_4p(p->screen_base+offset, lines * bytes, cval1, cval2);
}
}
/*
* `switch' for the low level operations
*/
struct display_switch fbcon_iplan2p4 = {
setup: fbcon_iplan2p4_setup,
bmove: fbcon_iplan2p4_bmove,
clear: fbcon_iplan2p4_clear,
putc: fbcon_iplan2p4_putc,
putcs: fbcon_iplan2p4_putcs,
revc: fbcon_iplan2p4_revc,
clear_margins: fbcon_iplan2p4_clear_margins,
fontwidthmask: FONTWIDTH(8)
};
#ifdef MODULE
MODULE_LICENSE("GPL");
int init_module(void)
{
return 0;
}
void cleanup_module(void)
{}
#endif /* MODULE */
/*
* Visible symbols for modules
*/
EXPORT_SYMBOL(fbcon_iplan2p4);
EXPORT_SYMBOL(fbcon_iplan2p4_setup);
EXPORT_SYMBOL(fbcon_iplan2p4_bmove);
EXPORT_SYMBOL(fbcon_iplan2p4_clear);
EXPORT_SYMBOL(fbcon_iplan2p4_putc);
EXPORT_SYMBOL(fbcon_iplan2p4_putcs);
EXPORT_SYMBOL(fbcon_iplan2p4_revc);
EXPORT_SYMBOL(fbcon_iplan2p4_clear_margins);
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