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/* |
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* Copyright (C) 2004-2005 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_bt455.c,v 1.9 2005/11/13 00:14:08 debug Exp $ |
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* |
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* Brooktree 455, used by TURBOchannel graphics cards. |
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* |
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* TODO: This is hardcoded to only use 16 grayscales, using only the |
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* green component of the palette. Perhaps some other graphics card uses |
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* the BT455 as well; if so then this device must be re-hacked. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "devices.h" |
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#include "memory.h" |
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#include "misc.h" |
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|
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|
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|
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struct bt455_data { |
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unsigned char addr_cmap; |
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unsigned char addr_cmap_data; |
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unsigned char addr_clr; |
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unsigned char addr_ovly; |
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|
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int cur_rgb_offset; |
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|
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struct vfb_data *vfb_data; |
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unsigned char *rgb_palette; /* ptr to 256 * 3 (r,g,b) */ |
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}; |
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|
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|
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/* |
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* dev_bt455_access(): |
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*/ |
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int dev_bt455_access(struct cpu *cpu, struct memory *mem, |
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uint64_t relative_addr, unsigned char *data, size_t len, |
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int writeflag, void *extra) |
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{ |
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struct bt455_data *d = (struct bt455_data *) extra; |
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uint64_t idata = 0, odata = 0; |
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int i, modified; |
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|
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if (writeflag == MEM_WRITE) |
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idata = memory_readmax64(cpu, data, len); |
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|
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/* Read from/write to the bt455: */ |
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switch (relative_addr) { |
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case 0x00: /* addr_cmap */ |
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if (writeflag == MEM_WRITE) { |
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debug("[ bt455: write to addr_cmap, 0x%02x ]\n", idata); |
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d->addr_cmap = idata; |
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d->cur_rgb_offset = (d->addr_cmap & 0xf) * 3; |
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} else { |
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odata = d->addr_cmap; |
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debug("[ bt455: read from addr_cmap: 0x%0x ]\n", odata); |
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} |
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break; |
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case 0x04: /* addr_cmap_data */ |
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if (writeflag == MEM_WRITE) { |
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debug("[ bt455: write to addr_cmap_data, 0x%02x ]\n", |
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(int)idata); |
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d->addr_cmap_data = idata; |
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|
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modified = 0; |
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|
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/* Only write on updates to the Green value: */ |
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if ((d->cur_rgb_offset % 3) == 1) { |
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/* Update 16 copies: */ |
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for (i=0; i<16; i++) { |
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int addr = (d->cur_rgb_offset + 16*i) |
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% 0x300; |
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int newvalue = idata * 0x11; |
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|
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if (d->rgb_palette[(addr / 3) * 3 + 0] |
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!= newvalue || |
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d->rgb_palette[(addr / 3) * 3 + 1] |
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!= newvalue || |
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d->rgb_palette[(addr / 3) * 3 + 2] |
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!= newvalue) |
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modified = 1; |
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|
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d->rgb_palette[(addr / 3) * 3 + 0] = |
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d->rgb_palette[(addr / 3) * 3 + 1] = |
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d->rgb_palette[(addr / 3) * 3 + 2] = |
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newvalue; |
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} |
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} |
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|
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if (modified) { |
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d->vfb_data->update_x1 = 0; |
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d->vfb_data->update_x2 = d->vfb_data->xsize - 1; |
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d->vfb_data->update_y1 = 0; |
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d->vfb_data->update_y2 = d->vfb_data->ysize - 1; |
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} |
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|
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/* Advance to next palette byte: */ |
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d->cur_rgb_offset ++; |
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} else { |
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odata = d->addr_cmap_data; |
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debug("[ bt455: read from addr_cmap_data: 0x%0x ]\n", |
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(int)odata); |
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} |
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break; |
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case 0x08: /* addr_clr */ |
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if (writeflag == MEM_WRITE) { |
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debug("[ bt455: write to addr_clr, value 0x%02x ]\n", |
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(int)idata); |
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d->addr_clr = idata; |
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} else { |
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odata = d->addr_clr; |
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debug("[ bt455: read from addr_clr: value 0x%02x ]\n", |
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(int)odata); |
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} |
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break; |
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case 0x0c: /* addr_ovly */ |
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if (writeflag == MEM_WRITE) { |
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debug("[ bt455: write to addr_ovly, value 0x%02x ]\n", |
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(int)idata); |
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d->addr_ovly = idata; |
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} else { |
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odata = d->addr_ovly; |
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debug("[ bt455: read from addr_ovly: value 0x%02x ]\n", |
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(int)odata); |
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} |
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break; |
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default: |
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if (writeflag == MEM_WRITE) { |
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debug("[ bt455: unimplemented write to address 0x%x," |
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" data=0x%02x ]\n", (int)relative_addr, (int)idata); |
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} else { |
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debug("[ bt455: unimplemented read from address " |
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"0x%x ]\n", (int)relative_addr); |
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} |
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} |
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|
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if (writeflag == MEM_READ) |
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memory_writemax64(cpu, data, len, odata); |
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|
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return 1; |
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} |
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|
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|
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/* |
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* dev_bt455_init(): |
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*/ |
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void dev_bt455_init(struct memory *mem, uint64_t baseaddr, |
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struct vfb_data *vfb_data) |
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{ |
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struct bt455_data *d = malloc(sizeof(struct bt455_data)); |
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if (d == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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memset(d, 0, sizeof(struct bt455_data)); |
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d->vfb_data = vfb_data; |
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d->rgb_palette = vfb_data->rgb_palette; |
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|
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memory_device_register(mem, "bt455", baseaddr, DEV_BT455_LENGTH, |
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dev_bt455_access, (void *)d, DM_DEFAULT, NULL); |
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} |
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