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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: bt455.c
* Author: Alessandro Forin, Carnegie Mellon University
* Date: 7/91
*
* Routines for the bt454/bt455 RAMDAC
*/
#include <platforms.h>
#include <chips/bt455.h>
#include <chips/screen.h>
#ifdef DECSTATION
typedef struct {
volatile unsigned char addr_cmap;
char pad0[3];
volatile unsigned char addr_cmap_data;
char pad1[3];
volatile unsigned char addr_clr;
char pad2[3];
volatile unsigned char addr_ovly;
char pad3[3];
} bt455_padded_regmap_t;
#else /*DECSTATION*/
typedef bt455_regmap_t bt455_padded_regmap_t;
#define wbflush()
#endif /*DECSTATION*/
/*
* Generic register access
*/
#define bt455_select_entry(regs, regno) \
{ \
(regs)->addr_cmap = (regno)&0x0f; \
wbflush(); \
}
/*
* Color map
*/
bt455_load_colormap( regs, map)
bt455_padded_regmap_t *regs;
color_map_t *map;
{
register int i;
bt455_select_entry(regs, 0);
for (i = 0; i < 16; i++, map++) {
regs->addr_cmap_data = map->red >> 4;
wbflush();
regs->addr_cmap_data = map->green >> 4;
wbflush();
regs->addr_cmap_data = map->blue >> 4;
wbflush();
}
}
bt455_load_colormap_entry( regs, entry, map)
register bt455_padded_regmap_t *regs;
register color_map_t *map;
{
bt455_select_entry(regs, entry);
regs->addr_cmap_data = map->red >> 4;
wbflush();
regs->addr_cmap_data = map->green >> 4;
wbflush();
regs->addr_cmap_data = map->blue >> 4;
wbflush();
}
bt455_init_colormap( regs)
bt455_padded_regmap_t *regs;
{
register int i;
color_map_t m[2];
m[0].red = m[0].green = m[0].blue = 0;
m[1].red = m[1].green = m[1].blue = 0xff;
for (i = 0; i < 16; i++)
bt455_load_colormap_entry(regs, i, &m[0]);
bt455_load_colormap_entry(regs, 1, &m[1]);
bt455_cursor_color( regs, &m[0]);
}
#if 1/*debug*/
bt455_print_colormap( regs)
bt455_padded_regmap_t *regs;
{
register int i;
for (i = 0; i < 16; i++) {
register unsigned char red, green, blue;
bt455_select_entry(regs, i);
red = regs->addr_cmap_data;
green = regs->addr_cmap_data;
blue = regs->addr_cmap_data;
printf("%x->[x%x x%x x%x]\n", i,
red, green, blue);
}
}
#endif
/*
* Video on/off
*/
bt455_video_off(regs, up)
bt455_padded_regmap_t *regs;
user_info_t *up;
{
color_map_t m;
unsigned char *save;
/* Yes, this is awful */
save = (unsigned char *)up->dev_dep_2.gx.colormap;
bt455_select_entry( regs, 0);
*save++ = regs->addr_cmap_data; /* entry 0 */
*save++ = regs->addr_cmap_data;
*save++ = regs->addr_cmap_data;
*save++ = regs->addr_cmap_data; /* entry 1 */
*save++ = regs->addr_cmap_data;
*save++ = regs->addr_cmap_data;
m.red = m.green = m.blue = 0;
bt455_load_colormap_entry(regs, 0, &m);
bt455_load_colormap_entry(regs, 1, &m);
}
bt455_video_on(regs, up)
bt455_padded_regmap_t *regs;
user_info_t *up;
{
unsigned char *save;
/* Like I said.. */
save = (unsigned char *)up->dev_dep_2.gx.colormap;
bt455_select_entry( regs, 0);
regs->addr_cmap_data = *save++; wbflush();
regs->addr_cmap_data = *save++; wbflush();
regs->addr_cmap_data = *save++; wbflush();
regs->addr_cmap_data = *save++; wbflush();
regs->addr_cmap_data = *save++; wbflush();
regs->addr_cmap_data = *save;
}
/*
* Cursor 'color' [as used on DEC's board]
*/
bt455_cursor_color( regs, color)
bt455_padded_regmap_t *regs;
color_map_t *color;
{
register int i;
/* Bg is the first in color */
bt455_load_colormap_entry( regs, 8, color);
bt455_load_colormap_entry( regs, 9, color);
/* Fg is overlay */
color++;
regs->addr_ovly = color->red >> 4;
wbflush();
regs->addr_ovly = color->green >> 4;
wbflush();
regs->addr_ovly = color->blue >> 4;
wbflush();
}
/*
* Initialization
*/
bt455_init(regs)
bt455_padded_regmap_t *regs;
{
/* Nothing really needed */
}
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