/*      $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;
}