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/*
* Copyright (C) 2004 Anders Gavare. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* $Id: dev_bt455.c,v 1.6 2005/01/09 01:55:24 debug Exp $
*
* Brooktree 455, used by TURBOchannel graphics cards.
*
* TODO: This is hardcoded to only use 16 grayscales, using only the
* green component of the palette. Perhaps some other graphics card uses
* the BT455 as well; if so then this device must be re-hacked.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "memory.h"
#include "misc.h"
#include "devices.h"
struct bt455_data {
unsigned char addr_cmap;
unsigned char addr_cmap_data;
unsigned char addr_clr;
unsigned char addr_ovly;
int cur_rgb_offset;
struct vfb_data *vfb_data;
unsigned char *rgb_palette; /* ptr to 256 * 3 (r,g,b) */
};
/*
* dev_bt455_access():
*/
int dev_bt455_access(struct cpu *cpu, struct memory *mem, uint64_t relative_addr, unsigned char *data, size_t len, int writeflag, void *extra)
{
struct bt455_data *d = (struct bt455_data *) extra;
uint64_t idata = 0, odata = 0;
int i, modified;
idata = memory_readmax64(cpu, data, len);
/* Read from/write to the bt455: */
switch (relative_addr) {
case 0x00: /* addr_cmap */
if (writeflag == MEM_WRITE) {
debug("[ bt455: write to addr_cmap, 0x%02x ]\n", idata);
d->addr_cmap = idata;
d->cur_rgb_offset = (d->addr_cmap & 0xf) * 3;
} else {
odata = d->addr_cmap;
debug("[ bt455: read from addr_cmap: 0x%0x ]\n", odata);
}
break;
case 0x04: /* addr_cmap_data */
if (writeflag == MEM_WRITE) {
debug("[ bt455: write to addr_cmap_data, 0x%02x ]\n", idata);
d->addr_cmap_data = idata;
modified = 0;
/* Only write on updates to the Green value: */
if ((d->cur_rgb_offset % 3) == 1) {
/* Update 16 copies: */
for (i=0; i<16; i++) {
int addr = (d->cur_rgb_offset + 16*i) % 0x300;
int newvalue = idata * 0x11;
if (d->rgb_palette[(addr / 3) * 3 + 0] != newvalue ||
d->rgb_palette[(addr / 3) * 3 + 1] != newvalue ||
d->rgb_palette[(addr / 3) * 3 + 2] != newvalue)
modified = 1;
d->rgb_palette[(addr / 3) * 3 + 0] = newvalue;
d->rgb_palette[(addr / 3) * 3 + 1] = newvalue;
d->rgb_palette[(addr / 3) * 3 + 2] = newvalue;
}
}
if (modified) {
d->vfb_data->update_x1 = 0;
d->vfb_data->update_x2 = d->vfb_data->xsize - 1;
d->vfb_data->update_y1 = 0;
d->vfb_data->update_y2 = d->vfb_data->ysize - 1;
}
/* Advance to next palette byte: */
d->cur_rgb_offset ++;
} else {
odata = d->addr_cmap_data;
debug("[ bt455: read from addr_cmap_data: 0x%0x ]\n", odata);
}
break;
case 0x08: /* addr_clr */
if (writeflag == MEM_WRITE) {
debug("[ bt455: write to addr_clr, value 0x%02x ]\n", idata);
d->addr_clr = idata;
} else {
odata = d->addr_clr;
debug("[ bt455: read from addr_clr: value 0x%02x ]\n", odata);
}
break;
case 0x0c: /* addr_ovly */
if (writeflag == MEM_WRITE) {
debug("[ bt455: write to addr_ovly, value 0x%02x ]\n", idata);
d->addr_ovly = idata;
} else {
odata = d->addr_ovly;
debug("[ bt455: read from addr_ovly: value 0x%02x ]\n", odata);
}
break;
default:
if (writeflag == MEM_WRITE) {
debug("[ bt455: unimplemented write to address 0x%x, data=0x%02x ]\n", relative_addr, idata);
} else {
debug("[ bt455: unimplemented read from address 0x%x ]\n", relative_addr);
}
}
if (writeflag == MEM_READ)
memory_writemax64(cpu, data, len, odata);
return 1;
}
/*
* dev_bt455_init():
*/
void dev_bt455_init(struct memory *mem, uint64_t baseaddr, struct vfb_data *vfb_data)
{
struct bt455_data *d = malloc(sizeof(struct bt455_data));
if (d == NULL) {
fprintf(stderr, "out of memory\n");
exit(1);
}
memset(d, 0, sizeof(struct bt455_data));
d->vfb_data = vfb_data;
d->rgb_palette = vfb_data->rgb_palette;
memory_device_register(mem, "bt455", baseaddr, DEV_BT455_LENGTH, dev_bt455_access, (void *)d, MEM_DEFAULT, NULL);
}
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