/* $NetBSD: tga_conf.c,v 1.4 2000/04/02 18:59:32 nathanw Exp $ */

/*
 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 *
 * 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 the
 * rights to redistribute these changes.
 */

#include <sys/param.h>
#include <sys/device.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/tgareg.h>
#include <dev/pci/tgavar.h>

#include <dev/ic/bt485var.h>
#include <dev/ic/bt463var.h>

#undef KB
#define KB              * 1024
#undef MB
#define MB                * 1024 * 1024

static const struct tga_conf tga_configs[TGA_TYPE_UNKNOWN] = {
        /* TGA_TYPE_T8_01 */
        {
                "T8-01",
                bt485_funcs,
                8,
                4 MB,
                2 KB,
                1,        {  2 MB,     0 },        { 1 MB,    0 },
                0,        {     0,     0 },        {    0,    0 },
        },
        /* TGA_TYPE_T8_02 */
        {
                "T8-02",
                bt485_funcs,
                8,
                4 MB,
                4 KB,
                1,        {  2 MB,     0 },        { 2 MB,    0 },
                0,        {     0,     0 },        {    0,    0 },
        },
        /* TGA_TYPE_T8_22 */
        {
                "T8-22",
                bt485_funcs,
                8,
                8 MB,
                4 KB,
                1,        {  4 MB,     0 },        { 2 MB,    0 },
                1,        {  6 MB,     0 },        { 2 MB,    0 },
        },
        /* TGA_TYPE_T8_44 */
        {
                "T8-44",
                bt485_funcs,
                8,
                16 MB,
                4 KB,
                2,        {  8 MB, 12 MB },        { 2 MB, 2 MB },
                2,        { 10 MB, 14 MB },        { 2 MB, 2 MB },
        },
        /* TGA_TYPE_T32_04 */
        {
                "T32-04",
                bt463_funcs,
                32,
                16 MB,
                8 KB,
                1,        {  8 MB,     0 },        { 4 MB,    0 },
                0,        {     0,     0 },        {    0,    0 },
        },
        /* TGA_TYPE_T32_08 */
        {
                "T32-08",
                bt463_funcs,
                32,
                16 MB,
                16 KB,
                1,        {  8 MB,    0 },        { 8 MB,    0 },
                0,        {     0,    0 },        {    0,    0 },
        },
        /* TGA_TYPE_T32_88 */
        {
                "T32-88",
                bt463_funcs,
                32,
                32 MB,
                16 KB,
                1,        { 16 MB,    0 },        { 8 MB,    0 },
                1,        { 24 MB,    0 },        { 8 MB,    0 },
        },
};

#undef KB
#undef MB

int
tga_identify(regs)
	tga_reg_t *regs;
{
        int type;
        int deep, addrmask, wide;

	deep = (regs[TGA_REG_GDER] & 0x1) != 0;                /* XXX */
	addrmask = ((regs[TGA_REG_GDER] >> 2) & 0x7);        /* XXX */
	wide = (regs[TGA_REG_GDER] & 0x200) == 0;        /* XXX */

        type = TGA_TYPE_UNKNOWN;

        if (!deep) {
                /* 8bpp frame buffer */

                if (addrmask == 0x0) {
                        /* 4MB core map; T8-01 or T8-02 */

                        if (!wide)
                                type = TGA_TYPE_T8_01;
                        else
                                type = TGA_TYPE_T8_02;
                } else if (addrmask == 0x1) {
                        /* 8MB core map; T8-22 */

                        if (wide)                        /* sanity */
                                type = TGA_TYPE_T8_22;
                } else if (addrmask == 0x3) {
                        /* 16MB core map; T8-44 */

                        if (wide)                        /* sanity */
                                type = TGA_TYPE_T8_44;
                }
        } else {
                /* 32bpp frame buffer */

                if (addrmask == 0x3) {
                        /* 16MB core map; T32-04 or T32-08 */

                        if (!wide)
                                type = TGA_TYPE_T32_04;
                        else
                                type = TGA_TYPE_T32_08;
                } else if (addrmask == 0x7) {
                        /* 32MB core map; T32-88 */

                        if (wide)                        /* sanity */
                                type = TGA_TYPE_T32_88;
                }
        }

        return (type);
}

const struct tga_conf *
tga_getconf(type)
        int type;
{

        if (type >= 0 && type < TGA_TYPE_UNKNOWN)
                return &tga_configs[type];

        return (NULL);
}