/*      $NetBSD: grf_tv.c,v 1.15 2011/02/08 20:20:25 rmind Exp $        */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * from: Utah $Hdr: grf_tc.c 1.20 93/08/13$
 *
 *      @(#)grf_tc.c    8.4 (Berkeley) 1/12/94
 */

/*
 * Graphics routines for the X68K native custom chip set.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: grf_tv.c,v 1.15 2011/02/08 20:20:25 rmind Exp $");

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

#include <machine/cpu.h>
#include <machine/grfioctl.h>

#include <x68k/dev/grfvar.h>
#include <x68k/x68k/iodevice.h>

int cc_init(struct grf_softc *, void *);
int cc_mode(struct grf_softc *, u_long, void *);

/* Initialize hardware.
 * Must fill in the grfinfo structure in g_softc.
 * Returns 0 if hardware not present, non-zero ow.
 */
int
cc_init(struct grf_softc *gp, void *addr)
{
        struct grfinfo *gi = &gp->g_display;

        gi->gd_fbwidth  = 1024; /* XXX */
        gi->gd_fbheight = 1024; /* XXX */
        gi->gd_planes  = 4;     /* XXX */
        gi->gd_regaddr = (void *)0x00e80000;    /* XXX */
        gi->gd_regsize = 0x00004000;            /* XXX */
        gi->gd_fbaddr  = (void *)0x00e00000;    /* XXX */
        gi->gd_fbsize  = gi->gd_fbwidth / 8 * gi->gd_fbheight * gi->gd_planes;
        gp->g_regkva   = addr;
        gp->g_fbkva    = addr;
        switch(IODEVbase->io_sram[0x1d]) {
        case 18:
                /*
                 * mode 18, 24kHz
                 */
                gi->gd_dwidth  = 1024;
                gi->gd_dheight =  848;
                break;
        case 19:
                /*
                 * mode 19, 31kHz VGA mode
                 */
                gi->gd_dwidth  = 640;
                gi->gd_dheight = 480;
                break;
        default:
                /*
                 * mode 16, 31kHz (default)
                 */
                gi->gd_dwidth  = 768;
                gi->gd_dheight = 512;
                break;
        }
        gi->gd_colors  = 1 << gi->gd_planes;

        return 1;
}

/*
 * Change the mode of the display.
 * Right now all we can do is grfon/grfoff.
 * Return a UNIX error number or 0 for success.
 */
/*ARGSUSED*/
int
cc_mode(struct grf_softc *gp, u_long cmd, void *data)
{
        int error = 0;

        switch (cmd) {
        case GM_GRFON:
        case GM_GRFOFF:
                break;

        /*
         * Remember UVA of mapping for GCDESCRIBE.
         * XXX this should be per-process.
         */
        case GM_MAP:
                gp->g_data = data;
                break;

        case GM_UNMAP:
                gp->g_data = 0;
                break;

        case GM_GRFSETVMODE:
                if (*(int *)data == 1) {
                        struct grfinfo *gi = &gp->g_display;
                        volatile struct crtc *crtc = &IODEVbase->io_crtc;
                        /* Reset CRTC, set dwidth and dheight accordingly */
                        crtc->r20 = (crtc->r20 & 0xFF00) | 0x1a;
                        crtc->r08 = 0x1b;
                        crtc->r07 = 0x19c;
                        crtc->r06 = 0x1c;
                        crtc->r05 = 0x02;
                        crtc->r04 = 0x019f;
                        crtc->r03 = 0x9a;
                        crtc->r02 = 0x1a;
                        crtc->r01 = 0x09;
                        crtc->r00 = 0xa4;
                        gi->gd_dwidth = 1024;
                        gi->gd_dheight = 768;
                }
                break;

        default:
                error = EINVAL;
                break;
        }
        return error;
}