xref: /src/sys/arch/amiga/dev/grf_cv.c

/*
 * Copyright (c) 1995 Michael Teske
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Ezra Story, by Kari
 *      Mettinen and by Bernd Ernesti.
 * 4. 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 ``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 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.
 */
#include "grfcv.h"
#if NGRFCV > 0

#undef CV64CONSOLE /* DO NOT REMOVE THIS till ite5 is ready */

/*
 * Graphics routines for the CyberVision 64 board, using the S3 Trio64.
 *
 * Modified for CV64 from
 * Kari Mettinen's Cirrus driver by Michael Teske 10/95
 * For questions mail me at teske (at) dice2.desy.de
 *
 * Thanks to Tekelec Airtronic for providing me with a S3 Trio64 documentation.
 * Thanks to Bernd 'the fabulous bug-finder' Ernesti for bringing my messy
 * source to NetBSD style :)
 *
 * TODO:
 *    Hardware Cursor support
 *    Blitter support
 *
 * BUGS:
 *    Xamiag24 and grf_cv can crash when you use fvwm with xterm's, you can
 *    avoid this by starting the xterm with '-ah', see the manpage of xterm
 *    for more informations about this switch.
 *    There is a bug in the Trio64 which produce a small (1 or 2 pixel) white
 *    vertical bar on the right side of an 8bit-Screen (only when you use more
 *    then 80MHz pixelclock). This has to be fixed in the Xserver.
 *
 */

#include <sys/param.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <machine/cpu.h>
#include <dev/cons.h>
#include <amiga/amiga/device.h>
#include <amiga/dev/grfioctl.h>
#include <amiga/dev/grfvar.h>
#include <amiga/dev/grf_cvreg.h>
#include <amiga/dev/zbusvar.h>

int cv_mondefok __P((struct grfvideo_mode *));
void cv_boardinit();
static unsigned short compute_clock __P((unsigned long));
int cv_getvmode __P((struct grf_softc *, struct grfvideo_mode *));
int cv_setvmode __P((struct grf_softc *, unsigned int));
int cv_setmonitor __P((struct grf_softc *, struct grfvideo_mode *));
int cv_toggle __P((struct grf_softc *,unsigned short));
int cv_getcmap __P((struct grf_softc *, struct grf_colormap *));
int cv_putcmap __P((struct grf_softc *, struct grf_colormap *));
void cv_off __P((struct grf_softc *));
int cv_blank __P((struct grf_softc *, int *));
void cv_inittextmode __P((struct grf_softc *));

int cv_ioctl __P((register struct grf_softc *gp, int cmd, void *data));
void grfcvattach __P((struct device *, struct device *, void *));
int  grfcvprint  __P((void *, char *));
int  grfcvmatch  __P((struct device *, struct cfdata *, void *));
void cv_memset __P((unsigned char *, unsigned char, int));

#ifdef CV64CONSOLE
extern void grfcv_iteinit __P((struct grf_softc *));
#endif

/* Graphics display definitions.
 * These are filled by 'grfconfig' using GRFIOCSETMON.
 */
#define monitor_def_max 8
static struct grfvideo_mode monitor_def[8] = {
	{0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}
};
static struct grfvideo_mode *monitor_current = &monitor_def[0];
#define MAXPIXELCLOCK 135000000 /* safety */


/* Console display definition.
 *   Default hardcoded text mode.  This grf_cv is set up to
 *   use one text mode only, and this is it.  You may use
 *   grfconfig to change the mode after boot.
 */

/* Console font */
#define S3FONT kernel_font_8x8
#define S3FONTX 8
#define S3FONTY 8
extern unsigned char S3FONT[];

struct grfcvtext_mode cvconsole_mode = {
	{255, "", 25000000, 640, 400, 4, 640, 656, 672, 720, 760, 406,
	441, 412, 426, 447},
	S3FONTX, S3FONTY, 80, 506/S3FONTY, S3FONT, 32, 255
};


/* Console colors */
unsigned char cvconscolors[3][3] = {	/* background, foreground, hilite */
	{0,0x40,0x50}, {152,152,152}, {255,255,255}
};

unsigned char pass_toggle;	/* passthru status tracker */


/* Board Address of CV64 */

static void *cv_boardaddr;
static int cv_fbsize;

int
grfcv_cnprobe()
{
	int rv;
	rv = CN_DEAD;
	return (rv);
}

/* standard driver stuff */
struct cfdriver grfcvcd = {
	NULL, "grfcv", (cfmatch_t)grfcvmatch, grfcvattach,
	DV_DULL, sizeof(struct grf_softc), NULL, 0
};
static struct cfdata *cfdata;


/* Reads from the fb must be done at addr + 0x02000000 */
#define READ_OFFSET 0x02000000

/*
 * Get frambuffer memory size.
 * phase5 didn't provide the bit in CR36,
 * so we have to do it this way.
 * Return 0 for 2MB, 1 for 4MB
 */

static int
cv_has_4mb (volatile char *fb)
{
	volatile unsigned long *testfbw, *testfbr;

	/* write patterns in memory and test if they can be read */
	testfbw = (volatile unsigned long *) fb;
	*testfbw = 0x87654321;
	testfbr = (volatile unsigned long *)(fb + READ_OFFSET);
	if (*testfbr != 0x87654321)
		return (0);
	/* upper memory region */
	testfbw = (volatile unsigned long *)(fb + 0x00200000);
	testfbr = (volatile unsigned long *)(fb + 0x00200000 + READ_OFFSET);
	*testfbw = 0x87654321;
	if (*testfbr != 0x87654321)
		return (0);
	*testfbw = 0xAAAAAAAA;
	if (*testfbr != 0xAAAAAAAA)
		return (0);
	*testfbw = 0x55555555;
	if (*testfbr != 0x55555555)
		return (0);
	return (1);
}

int
grfcvmatch(pdp, cfp, auxp)
	struct device *pdp;
	struct cfdata *cfp;
	void *auxp;
{
	struct zbus_args *zap;

	zap = auxp;

#ifndef CV64CONSOLE
	if (amiga_realconfig == 0)
		 return (0);
#endif

        /* Lets be Paranoid: Test man and prod id */
	if (zap->manid != 8512 || zap->prodid != 34)
		return (0);

	cv_boardaddr = zap->va;

#ifdef CV64CONSOLE
	if (amiga_realconfig == 0) {
		cfdata = cfp;
	}
#endif

	return (1);
}

void
grfcvattach(pdp, dp, auxp)
	struct device *pdp, *dp;
	void *auxp;
{
	static struct grf_softc congrf;
	struct zbus_args *zap;
	struct grf_softc *gp;
	static char attachflag = 0;

	zap = auxp;

	printf("\n");

	/* make sure id's have matched */
	if (!cv_boardaddr)
		return;

	/* do all that messy console/grf stuff */
	if (dp == NULL)
		gp = &congrf;
	else
		gp = (struct grf_softc *)dp;

	if (dp != NULL && congrf.g_regkva != 0) {
		/*
		 * inited earlier, just copy (not device struct)
		 */
		bcopy(&congrf.g_display, &gp->g_display,
		    (char *)&gp[1] - (char *)&gp->g_display);
	} else {
		gp->g_regkva = (volatile caddr_t)cv_boardaddr + READ_OFFSET;
		gp->g_fbkva = (volatile caddr_t)cv_boardaddr + 0x01400000;

		gp->g_unit = GRF_CV64_UNIT;
		gp->g_mode = cv_mode;
		gp->g_conpri = grfcv_cnprobe();
		gp->g_flags = GF_ALIVE;

		/* wakeup the board */
		cv_boardinit(gp);

#ifdef CV64CONSOLE
		grfcv_iteinit(gp);
		(void)cv_load_mon(gp, &cvconsole_mode);
#endif
	}

	/*
	 * attach grf (once)
	 */
	if (amiga_config_found(cfdata, &gp->g_device, gp, grfcvprint)) {
		attachflag = 1;
		printf("grfcv: CyberVision64 with %dMB being used\n", cv_fbsize/0x100000);
	} else {
		if (!attachflag)
			printf("grfcv unattached!!\n");
	}
}

int
grfcvprint(auxp, pnp)
	void *auxp;
	char *pnp;
{
	if (pnp)
		printf("ite at %s: ", pnp);
	return (UNCONF);
}


/*
 * Computes M, N, and R values from
 * given input frequency. It uses a table of
 * precomputed values, to keep CPU time low.
 *
 * The return value consist of:
 * lower byte:  Bits 4-0: N Divider Value
 *	        Bits 5-6: R Value          for e.g. SR10 or SR12
 * higher byte: Bits 0-6: M divider value  for e.g. SR11 or SR13
 */

static unsigned short
compute_clock(freq)
	unsigned long freq;
{

	static unsigned char *mnr, *save;	/* M, N + R vals */
	unsigned long work_freq, r;
	unsigned short erg;
	long diff, d2;

	/* 0xBEBC20 = 12.5M */
	/* 0x080BEFC0 = 135M */
	if (freq < 0x00BEBC20 || freq > 0x080BEFC0) {
		printf("grfcv: Wrong clock frequency: %dMHz", freq/1000000);
		printf("grfcv: Using default frequency: 25MHz");
		freq = 0x017D7840;
	}

	mnr = clocks;	/* there the vals are stored */
	d2 = 0x7fffffff;

	while (*mnr) {	/* mnr vals are 0-terminated */
		work_freq = (0x37EE * (mnr[0] + 2)) / ((mnr[1] & 0x1F) + 2);

		r = (mnr[1] >> 5) & 0x03;
    		if (r != 0)
			work_freq=work_freq >> r;	/* r is the freq divider */

		work_freq *= 0x3E8;	/* 2nd part of OSC */

		diff = abs(freq - work_freq);

		if (d2 >= diff) {
			d2 = diff;
			/* In save are the vals for minimal diff */
			save = mnr;
		}
		mnr += 2;
	}
	erg = *((unsigned short *)save);

	return (erg);
}


void
cv_boardinit(gp)
	struct grf_softc *gp;
{
	unsigned char *ba = gp->g_regkva;
	unsigned char test;
	unsigned int clockpar;
	int i;
	struct grfinfo *gi;

	/* Reset board */
	for (i = 0; i < 6; i++)
		cv_write_port (0xff, ba - READ_OFFSET);	/* Clear all bits */

	/* Return to operational Mode */
	cv_write_port(0x8004, ba - READ_OFFSET);

	/* Wakeup Chip */
	vgaw(ba, SREG_VIDEO_SUBS_ENABLE, 0x10);
	vgaw(ba, SREG_OPTION_SELECT, 0x1);
	vgaw(ba, SREG_VIDEO_SUBS_ENABLE, 0x8);

	vgaw(ba, GREG_MISC_OUTPUT_W, 0x23);

	WCrt(ba, CRT_ID_REGISTER_LOCK_1, 0x48);	/* unlock S3 VGA regs */
	WCrt(ba, CRT_ID_REGISTER_LOCK_2, 0xA5);	/* unlock syscontrol */

	test = RCrt(ba, CRT_ID_SYSTEM_CONFIG);
	test = test | 0x01;	/* enable enhaced register access */
	test = test & 0xEF;	/* clear bit 4, 0 wait state */
	WCrt(ba, CRT_ID_SYSTEM_CONFIG, test);

	/*
	 * bit 1=1: enable enhanced mode functions
	 * bit 4=1: enable linear adressing
 	 */
	vgaw(ba, ECR_ADV_FUNC_CNTL, 0x11);

	/* enable cpu acess, color mode, high 64k page */
	vgaw(ba, GREG_MISC_OUTPUT_W, 0x23);

	/* Cpu base addr */
	WCrt(ba, CRT_ID_EXT_SYS_CNTL_4, 0x0);

	/* Reset. This does nothing, but everyone does it:) */
	WSeq(ba, SEQ_ID_RESET, 0x3);

	WSeq(ba, SEQ_ID_CLOCKING_MODE, 0x1);	/* 8 Dot Clock */
	WSeq(ba, SEQ_ID_MAP_MASK, 0xF);		/* Enable write planes */
	WSeq(ba, SEQ_ID_CHAR_MAP_SELECT, 0x0);	/* Character Font */

	WSeq(ba, SEQ_ID_MEMORY_MODE, 0x2);	/* Complete mem access */

	WSeq(ba, SEQ_ID_UNLOCK_EXT, 0x6);	/* Unlock extensions */
	test = RSeq(ba, SEQ_ID_BUS_REQ_CNTL);	/* Bus Request */

	/* enable 4MB fast Page Mode */
	test = test | 1 << 6;
	WSeq(ba, SEQ_ID_BUS_REQ_CNTL, test);
	/* faster LUT write */
	WSeq(ba, SEQ_ID_RAMDAC_CNTL, 0x40);

	test = RSeq(ba, SEQ_ID_CLKSYN_CNTL_2);	/* Clksyn2 read */

	/* immediately Clkload bit clear */
	test = test & 0xDF;
	WSeq(ba, SEQ_ID_CLKSYN_CNTL_2, test);

	clockpar = compute_clock(0x3473BC0);
	test = (clockpar & 0xFF00) >> 8;
	WSeq(ba, SEQ_ID_MCLK_HI, test);		/* PLL N-Divider Value */

	test = clockpar & 0xFF;
	WSeq(ba, SEQ_ID_MCLK_LO, test);		/* PLL M-Divider Value */

	/* We now load an 25 MHz, 31 kHz, 640x480 standard VGA Mode. */
	/* DCLK */
	WSeq(ba, SEQ_ID_DCLK_HI, 0x13);
	WSeq(ba, SEQ_ID_DCLK_LO, 0x41);

	test = RSeq (ba, SEQ_ID_CLKSYN_CNTL_2);
	test = test | 0x22;

	/* DCLK + MCLK Clock immediate load! */
	WSeq(ba,SEQ_ID_CLKSYN_CNTL_2, test);

	/* DCLK load */
	test = vgar(ba, 0x3cc);
	test = test | 0x0c;
	vgaw(ba, 0x3c2, test);

	/* Clear bit 5 again, prevent further loading. */
	WSeq(ba, SEQ_ID_CLKSYN_CNTL_2, 0x2);

	WCrt(ba, CRT_ID_HOR_TOTAL, 0x5F);
	WCrt(ba, CRT_ID_HOR_DISP_ENA_END, 0x4F);
	WCrt(ba, CRT_ID_START_HOR_BLANK, 0x50);
	WCrt(ba, CRT_ID_END_HOR_BLANK, 0x82);
	WCrt(ba, CRT_ID_START_HOR_RETR, 0x54);
	WCrt(ba, CRT_ID_END_HOR_RETR, 0x80);
	WCrt(ba, CRT_ID_VER_TOTAL, 0xBF);

	WCrt(ba, CRT_ID_OVERFLOW, 0x1F);	/* overflow reg */

	WCrt(ba, CRT_ID_PRESET_ROW_SCAN, 0x0);	/* no panning */

	WCrt(ba, CRT_ID_MAX_SCAN_LINE, 0x40);	/* vscan */

	WCrt(ba, CRT_ID_CURSOR_START, 0x00);
	WCrt(ba, CRT_ID_CURSOR_END, 0x00);

	/* Display start adress */
	WCrt(ba, CRT_ID_START_ADDR_HIGH, 0x00);
	WCrt(ba, CRT_ID_START_ADDR_LOW, 0x00);

	/* Cursor location */
	WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, 0x00);
	WCrt(ba, CRT_ID_CURSOR_LOC_LOW, 0x00);

	/* Vertical retrace */
	WCrt(ba, CRT_ID_START_VER_RETR, 0x9C);
	WCrt(ba, CRT_ID_END_VER_RETR, 0x0E);

	WCrt(ba, CRT_ID_VER_DISP_ENA_END, 0x8F);
	WCrt(ba, CRT_ID_SCREEN_OFFSET, 0x50);

	WCrt(ba, CRT_ID_UNDERLINE_LOC, 0x00);

	WCrt(ba, CRT_ID_START_VER_BLANK, 0x96);
	WCrt(ba, CRT_ID_END_VER_BLANK, 0xB9);

	WCrt(ba, CRT_ID_MODE_CONTROL, 0xE3);

	WCrt(ba, CRT_ID_LINE_COMPARE, 0xFF);

	WCrt(ba, CRT_ID_BACKWAD_COMP_3, 0x10);	/* FIFO enabled */

	/* Refresh count 1, High speed text font, enhanced color mode */
	WCrt(ba, CRT_ID_MISC_1, 0x35);

	/* start fifo position */
	WCrt(ba, CRT_ID_DISPLAY_FIFO, 0x5a);

	WCrt(ba, CRT_ID_EXT_MEM_CNTL_2, 0x70);

	/* address window position */
	WCrt(ba, CRT_ID_LAW_POS_LO, 0x40);

	/* N Parameter for Display FIFO */
	WCrt(ba, CRT_ID_EXT_MEM_CNTL_3, 0xFF);

	WGfx(ba, GCT_ID_SET_RESET, 0x0);
	WGfx(ba, GCT_ID_ENABLE_SET_RESET, 0x0);
	WGfx(ba, GCT_ID_COLOR_COMPARE, 0x0);
	WGfx(ba, GCT_ID_DATA_ROTATE, 0x0);
	WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x0);
	WGfx(ba, GCT_ID_GRAPHICS_MODE, 0x40);
	WGfx(ba, GCT_ID_MISC, 0x01);
	WGfx(ba, GCT_ID_COLOR_XCARE, 0x0F);
	WGfx(ba, GCT_ID_BITMASK, 0xFF);

	/* colors for text mode */
	for (i = 0; i <= 0xf; i++)
		WAttr (ba, i, i);

	WAttr(ba, ACT_ID_ATTR_MODE_CNTL, 0x41);
	WAttr(ba, ACT_ID_OVERSCAN_COLOR, 0x01);
	WAttr(ba, ACT_ID_COLOR_PLANE_ENA, 0x0F);
	WAttr(ba, ACT_ID_HOR_PEL_PANNING, 0x0);
	WAttr(ba, ACT_ID_COLOR_SELECT, 0x0);

	vgaw(ba, VDAC_MASK, 0xFF);	/* DAC Mask */

	*((unsigned long *)(ba + ECR_FRGD_COLOR)) = 0xFF;
	*((unsigned long *)(ba + ECR_BKGD_COLOR)) = 0;

	/* colors initially set to greyscale */

	vgaw(ba, VDAC_ADDRESS_W, 0);
	for (i = 255; i >= 0 ; i--) {
		vgaw(ba, VDAC_DATA, i);
		vgaw(ba, VDAC_DATA, i);
		vgaw(ba, VDAC_DATA, i);
	}

	/* GFx hardware cursor off */
	WCrt(ba, CRT_ID_HWGC_MODE, 0x00);

	/* Set first to 4 MB, so test will work */
	WCrt(ba, CRT_ID_LAW_CNTL, 0x13);

	/* find *correct* fbsize of z3 board */
	if (cv_has_4mb((volatile char *)cv_boardaddr + 0x01400000)) {
		cv_fbsize = 1024 * 1024 * 4;
		WCrt(ba, CRT_ID_LAW_CNTL, 0x13); /* 4 MB */
	} else {
		cv_fbsize = 1024 * 1024 * 2;
		WCrt(ba, CRT_ID_LAW_CNTL, 0x12); /* 2 MB */
	}

	/* If I knew what this really does... but it _is_ necessary
	to get any gfx on the screen!! Undocumented register? */
	WAttr(ba, 0x33, 0);

	gi = &gp->g_display;
	gi->gd_regaddr	= (caddr_t) kvtop (ba);
	gi->gd_regsize	= 64 * 1024;
	gi->gd_fbaddr	= (caddr_t) kvtop (gp->g_fbkva);
	gi->gd_fbsize	= cv_fbsize;
}


int
cv_getvmode(gp, vm)
	struct grf_softc *gp;
	struct grfvideo_mode *vm;
{
	struct grfvideo_mode *gv;

#ifdef CV64CONSOLE
	/* Handle grabbing console mode */
	if (vm->mode_num == 255) {
		bcopy(&cvconsole_mode, vm, sizeof(struct grfvideo_mode));
		/* XXX so grfconfig can tell us the correct text dimensions. */
		vm->depth = cvconsole_mode.fy;
	} else
#endif
	{
		if (vm->mode_num == 0)
			vm->mode_num = (monitor_current - monitor_def) + 1;
		if (vm->mode_num < 1 || vm->mode_num > monitor_def_max)
			return (EINVAL);
		gv = monitor_def + (vm->mode_num - 1);
		if (gv->mode_num == 0)
			return (EINVAL);

		bcopy(gv, vm, sizeof(struct grfvideo_mode));
	}

	/* adjust internal values to pixel values */

	vm->hblank_start *= 8;
	vm->hblank_stop *= 8;
	vm->hsync_start *= 8;
	vm->hsync_stop *= 8;
	vm->htotal *= 8;

	return (0);
}


int
cv_setvmode(gp, mode)
	struct grf_softc *gp;
	unsigned mode;
{
	if (!mode || (mode > monitor_def_max) ||
	    monitor_def[mode-1].mode_num == 0)
		return (EINVAL);

	monitor_current = monitor_def + (mode - 1);

	return (0);
}

void
cv_off(gp)
	struct grf_softc *gp;
{
	char *ba = gp->g_regkva - READ_OFFSET;

	/* we'll put the pass-through on for cc ite and set Full Bandwidth
	 * bit on just in case it didn't work...but then it doesn't matter
	 * does it? =)
	 */
	cvscreen(1, ba);
}

int
cv_blank(gp, on)
	struct grf_softc *gp;
	int *on;
{
	char *ba = gp->g_regkva;

	gfx_on_off(*on ? 1 : 0, ba);
	return (0);
}


/*
 * Change the mode of the display.
 * Return a UNIX error number or 0 for success.
 */
int
cv_mode(gp, cmd, arg, a2, a3)
	register struct grf_softc *gp;
	int cmd;
	void *arg;
	int a2, a3;
{
	int error;

	switch (cmd) {
	case GM_GRFON:
		error = cv_load_mon (gp,
		    (struct grfcvtext_mode *) monitor_current) ? 0 : EINVAL;
		return (error);

	case GM_GRFOFF:
#ifndef CV64CONSOLE
		cv_off(gp);
#else
		cv_load_mon(gp, &cvconsole_mode);
#endif
		return (0);

	case GM_GRFCONFIG:
		return (0);

	case GM_GRFGETVMODE:
		return (cv_getvmode (gp, (struct grfvideo_mode *) arg));

	case GM_GRFSETVMODE:
		error = cv_setvmode (gp, *(unsigned *) arg);
		if (!error && (gp->g_flags & GF_GRFON))
			cv_load_mon(gp,
			    (struct grfcvtext_mode *) monitor_current);
		return (error);

	case GM_GRFGETNUMVM:
		*(int *)arg = monitor_def_max;
		return (0);

	case GM_GRFIOCTL:
		return (cv_ioctl (gp, (int) arg, (caddr_t) a2));

	default:
		break;
	}

	return (EINVAL);
}

int
cv_ioctl (gp, cmd, data)
	register struct grf_softc *gp;
	int cmd;
	void *data;
{
	switch (cmd) {
	case GRFIOCGSPRITEPOS:
	case GRFIOCSSPRITEPOS:
	case GRFIOCSSPRITEINF:
	case GRFIOCGSPRITEINF:
	case GRFIOCGSPRITEMAX:
		break;

	case GRFIOCGETCMAP:
		return (cv_getcmap (gp, (struct grf_colormap *) data));

	case GRFIOCPUTCMAP:
		return (cv_putcmap (gp, (struct grf_colormap *) data));

	case GRFIOCBITBLT:
		break;

	case GRFTOGGLE:
		return (cv_toggle (gp, 0));

	case GRFIOCSETMON:
		return (cv_setmonitor (gp, (struct grfvideo_mode *)data));

	case GRFIOCBLANK:
		return (cv_blank (gp, (int *)data));
	}
	return (EINVAL);
}

int
cv_setmonitor(gp, gv)
	struct grf_softc *gp;
	struct grfvideo_mode *gv;
{
	struct grfvideo_mode *md;

	if (!cv_mondefok(gv))
		return (EINVAL);

#ifdef CV64CONSOLE
	/* handle interactive setting of console mode */
	if (gv->mode_num == 255) {
		bcopy(gv, &cvconsole_mode.gv, sizeof(struct grfvideo_mode));
		cvconsole_mode.gv.hblank_start /= 8;
		cvconsole_mode.gv.hblank_stop /= 8;
		cvconsole_mode.gv.hsync_start /= 8;
		cvconsole_mode.gv.hsync_stop /= 8;
		cvconsole_mode.gv.htotal /= 8;
		cvconsole_mode.rows = gv->disp_height / cvconsole_mode.fy;
		cvconsole_mode.cols = gv->disp_width / cvconsole_mode.fx;
		if (!(gp->g_flags & GF_GRFON))
			cv_load_mon(gp, &cvconsole_mode);
		ite_reinit(gp->g_itedev);
		return (0);
	}
#endif

	md = monitor_def + (gv->mode_num - 1);
	bcopy(gv, md, sizeof(struct grfvideo_mode));

	/* adjust pixel oriented values to internal rep. */

	md->hblank_start /= 8;
	md->hblank_stop /= 8;
	md->hsync_start /= 8;
	md->hsync_stop /= 8;
	md->htotal /= 8;

	return (0);
}

int
cv_getcmap(gfp, cmap)
	struct grf_softc *gfp;
	struct grf_colormap *cmap;
{
	volatile unsigned char *ba;
	u_char red[256], green[256], blue[256], *rp, *gp, *bp;
	short x;
	int error;

	if (cmap->count == 0 || cmap->index >= 256)
		return (0);

	if (cmap->index + cmap->count > 256)
		cmap->count = 256 - cmap->index;

	ba = gfp->g_regkva;
	/* first read colors out of the chip, then copyout to userspace */
	vgaw (ba, VDAC_ADDRESS_W, cmap->index);
	x = cmap->count - 1;

	rp = red + cmap->index;
	gp = green + cmap->index;
	bp = blue + cmap->index;

	do {
		*rp++ = vgar (ba, VDAC_DATA) << 2;
		*gp++ = vgar (ba, VDAC_DATA) << 2;
		*bp++ = vgar (ba, VDAC_DATA) << 2;
	} while (x-- > 0);

	if (!(error = copyout (red + cmap->index, cmap->red, cmap->count))
	    && !(error = copyout (green + cmap->index, cmap->green, cmap->count))
	    && !(error = copyout (blue + cmap->index, cmap->blue, cmap->count)))
		return (0);

	return (error);
}

int
cv_putcmap(gfp, cmap)
	struct grf_softc *gfp;
	struct grf_colormap *cmap;
{
	volatile unsigned char *ba;
	u_char red[256], green[256], blue[256], *rp, *gp, *bp;
	short x;
	int error;

	if (cmap->count == 0 || cmap->index >= 256)
		return (0);

	if (cmap->index + cmap->count > 256)
		cmap->count = 256 - cmap->index;

	/* first copy the colors into kernelspace */
	if (!(error = copyin (cmap->red, red + cmap->index, cmap->count))
	    && !(error = copyin (cmap->green, green + cmap->index, cmap->count))
	    && !(error = copyin (cmap->blue, blue + cmap->index, cmap->count))) {
		ba = gfp->g_regkva;
		vgaw (ba, VDAC_ADDRESS_W, cmap->index);
		x = cmap->count - 1;

		rp = red + cmap->index;
		gp = green + cmap->index;
		bp = blue + cmap->index;

		do {
			vgaw (ba, VDAC_DATA, *rp++ >> 2);
			vgaw (ba, VDAC_DATA, *gp++ >> 2);
			vgaw (ba, VDAC_DATA, *bp++ >> 2);
		} while (x-- > 0);
		return (0);
	} else
		return (error);
}


int
cv_toggle(gp,wopp)
	struct grf_softc *gp;
	unsigned short wopp; /* don't need that one yet, ill */
{
	volatile unsigned char *ba;

	ba = gp->g_regkva - READ_OFFSET;

	if (pass_toggle) {
		cvscreen(0, ba);
	} else {
		cvscreen(1, ba);
	}
	return (0);
}


int
cv_mondefok(gv)
	struct grfvideo_mode *gv;
{
	unsigned long maxpix;

	if (gv->mode_num < 1 || gv->mode_num > monitor_def_max)
		if (gv->mode_num != 255 || gv->depth != 4)
			return (0);

	switch(gv->depth) {
	   case 1:
	   case 4:
		/* Remove this comment when ite5 is ready */
		/* if (gv->mode_num != 255) */
			return (0);
	   case 8:
		maxpix = MAXPIXELCLOCK;
		break;
	   case 15:
	   case 16:
		maxpix = MAXPIXELCLOCK - 55000000;
		break;
	   case 24:
		maxpix = MAXPIXELCLOCK - 85000000;
		break;
	   default:
		return (0);
	}

	if (gv->pixel_clock > maxpix)
		return (0);
	return (1);
}

int
cv_load_mon(gp, md)
	struct grf_softc *gp;
	struct grfcvtext_mode *md;
{
	struct grfvideo_mode *gv;
	struct grfinfo *gi;
	volatile unsigned char *ba;
	volatile unsigned char *fb;
	unsigned short mnr;
	unsigned short HT, HDE, HBS, HBE, HSS, HSE, VDE, VBS, VBE, VSS,
		VSE, VT;
	char LACE, DBLSCAN, TEXT;
	int uplim, lowlim;
	int cr33, sr15, sr18, clock_mode, test;
	int m, n, clock;	/* For calc'ing display FIFO */

	/* identity */
	gv = &md->gv;
	TEXT = (gv->depth == 4);

	if (!cv_mondefok(gv)) {
		printf("mondef not ok\n");
		return (0);
	}
	ba = gp->g_regkva;
	fb = gp->g_fbkva;

	/* turn gfx off, don't mess up the display */
	gfx_on_off(1, ba);

	/* provide all needed information in grf device-independant locations */
	gp->g_data		= (caddr_t) gv;
	gi = &gp->g_display;
	gi->gd_colors		= 1 << gv->depth;
	gi->gd_planes		= gv->depth;
	gi->gd_fbwidth		= gv->disp_width;
	gi->gd_fbheight		= gv->disp_height;
	gi->gd_fbx		= 0;
	gi->gd_fby		= 0;
	if (TEXT) {
		gi->gd_dwidth	= md->fx * md->cols;
		gi->gd_dheight	= md->fy * md->rows;
	} else {
		gi->gd_dwidth	= gv->disp_width;
		gi->gd_dheight	= gv->disp_height;
	}
	gi->gd_dx		= 0;
	gi->gd_dy		= 0;

	/* get display mode parameters */

	HBS = gv->hblank_start;
	HBE = gv->hblank_stop;
	HSS = gv->hsync_start;
	HSE = gv->hsync_stop;
	HT  = gv->htotal;
	VBS = gv->vblank_start;
	VSS = gv->vsync_start;
	VSE = gv->vsync_stop;
	VBE = gv->vblank_stop;
	VT  = gv->vtotal;

	if (TEXT)
		HDE = ((gv->disp_width + md->fx - 1) / md->fx) - 1;
	else
		HDE = (gv->disp_width + 3) / 8 - 1; /*HBS;*/
	VDE = gv->disp_height - 1;

	/* figure out whether lace or dblscan is needed */

	uplim = gv->disp_height + (gv->disp_height / 4);
	lowlim = gv->disp_height - (gv->disp_height / 4);
	LACE = (((VT * 2) > lowlim) && ((VT * 2) < uplim)) ? 1 : 0;
	DBLSCAN = (((VT / 2) > lowlim) && ((VT / 2) < uplim)) ? 1 : 0;

	/* adjustments */

	if (LACE)
		VDE /= 2;

	WSeq(ba, SEQ_ID_MEMORY_MODE, (TEXT || (gv->depth == 1)) ? 0x06 : 0x0e);
	WGfx(ba, GCT_ID_READ_MAP_SELECT, 0x00);
	WSeq(ba, SEQ_ID_MAP_MASK, (gv->depth == 1) ? 0x01 : 0xff);
	WSeq(ba, SEQ_ID_CHAR_MAP_SELECT, 0x00);

	/* Set clock */

	switch (gv->depth) {
	   case 15:
	   case 16:
		mnr = compute_clock(gv->pixel_clock * 2);
		break;
	   case 24:
		mnr = compute_clock(gv->pixel_clock * 3);
		break;
	   default:
		mnr = compute_clock(gv->pixel_clock);
		break;
	}

	WSeq(ba, SEQ_ID_DCLK_HI, ((mnr & 0xFF00) >> 8) );
	WSeq(ba, SEQ_ID_DCLK_LO, (mnr & 0xFF));

	/* load display parameters into board */

	WCrt(ba, CRT_ID_EXT_HOR_OVF,
	   ((HT & 0x100) ? 0x01 : 0x00) |
	   ((HDE & 0x100) ? 0x02 : 0x00) |
	   ((HBS & 0x100) ? 0x04 : 0x00) |
	/* ((HBE & 0x40) ? 0x08 : 0x00) | */  /* Later... */
	   ((HSS & 0x100) ? 0x10 : 0x00) |
	/* ((HSE & 0x20) ? 0x20 : 0x00) | */
	   (((HT-5) & 0x100) ? 0x40 : 0x00) );

	WCrt(ba, CRT_ID_EXT_VER_OVF,
	    0x40 |	/* Line compare */
	    ((VT  & 0x400) ? 0x01 : 0x00) |
	    ((VDE & 0x400) ? 0x02 : 0x00) |
	    ((VBS & 0x400) ? 0x04 : 0x00) |
	    ((VSS & 0x400) ? 0x10 : 0x00) );

	WCrt(ba, CRT_ID_HOR_TOTAL, HT);
	WCrt(ba, CRT_ID_DISPLAY_FIFO, HT - 5);

	WCrt(ba, CRT_ID_HOR_DISP_ENA_END, ((HDE >= HBS) ? (HBS - 1) : HDE));
	WCrt(ba, CRT_ID_START_HOR_BLANK, HBS);
	WCrt(ba, CRT_ID_END_HOR_BLANK, ((HBE & 0x1f) | 0x80));
	WCrt(ba, CRT_ID_START_HOR_RETR, HSS);
	WCrt(ba, CRT_ID_END_HOR_RETR,
	    (HSE & 0x1f) |
	    ((HBE & 0x20) ? 0x80 : 0x00) );
	WCrt(ba, CRT_ID_VER_TOTAL, VT);
	WCrt(ba, CRT_ID_OVERFLOW,
	    0x10 |
	    ((VT  & 0x100) ? 0x01 : 0x00) |
	    ((VDE & 0x100) ? 0x02 : 0x00) |
	    ((VSS & 0x100) ? 0x04 : 0x00) |
	    ((VBS & 0x100) ? 0x08 : 0x00) |
	    ((VT  & 0x200) ? 0x20 : 0x00) |
	    ((VDE & 0x200) ? 0x40 : 0x00) |
	    ((VSS & 0x200) ? 0x80 : 0x00) );

	WCrt(ba, CRT_ID_MAX_SCAN_LINE,
	    0x40 |  /* TEXT ? 0x00 ??? */
	    (DBLSCAN ? 0x80 : 0x00) |
	    ((VBS & 0x200) ? 0x20 : 0x00) |
	    (TEXT ? ((md->fy - 1) & 0x1f) : 0x00));

	WCrt(ba, CRT_ID_MODE_CONTROL,
	    ((TEXT || (gv->depth == 1)) ? 0xc3 : 0xe3));

	/* text cursor */

	if (TEXT) {
#if 1
		WCrt(ba, CRT_ID_CURSOR_START, (md->fy & 0x1f) - 2);
		WCrt(ba, CRT_ID_CURSOR_END, (md->fy & 0x1f) - 1);
#else
		WCrt(ba, CRT_ID_CURSOR_START, 0x00);
		WCrt(ba, CRT_ID_CURSOR_END, md->fy & 0x1f);
#endif
		WCrt(ba, CRT_ID_UNDERLINE_LOC, (md->fy - 1) & 0x1f);

		WCrt(ba, CRT_ID_CURSOR_LOC_HIGH, 0x00);
		WCrt(ba, CRT_ID_CURSOR_LOC_LOW, 0x00);
	}

	WCrt(ba, CRT_ID_START_ADDR_HIGH, 0x00);
	WCrt(ba, CRT_ID_START_ADDR_LOW, 0x00);

	WCrt(ba, CRT_ID_START_VER_RETR, VSS);
	WCrt(ba, CRT_ID_END_VER_RETR, (VSE & 0x0f));
	WCrt(ba, CRT_ID_VER_DISP_ENA_END, VDE);
	WCrt(ba, CRT_ID_START_VER_BLANK, VBS);
	WCrt(ba, CRT_ID_END_VER_BLANK, VBE);

	WCrt(ba, CRT_ID_LINE_COMPARE, 0xff);
	WCrt(ba, CRT_ID_LACE_RETR_START, HT / 2);
	WCrt(ba, CRT_ID_LACE_CONTROL, (LACE ? 0x20 : 0x00));

	WGfx(ba, GCT_ID_GRAPHICS_MODE,
	    ((TEXT || (gv->depth == 1)) ? 0x00 : 0x40));
	WGfx(ba, GCT_ID_MISC, (TEXT ? 0x04 : 0x01));

	WSeq (ba, SEQ_ID_MEMORY_MODE,
	    ((TEXT || (gv->depth == 1)) ? 0x6 : 0x02));

	vgaw(ba, VDAC_MASK, 0xff);

	sr15 = RSeq(ba, SEQ_ID_CLKSYN_CNTL_2);
	sr15 &= 0xef;
	sr18 = RSeq(ba, SEQ_ID_RAMDAC_CNTL);
	sr18 &= 0x7f;
	cr33 = RCrt(ba, CRT_ID_BACKWAD_COMP_2);
	cr33 &= 0xdf;
	clock_mode = 0x00;

	test = RCrt(ba, CRT_ID_EXT_MISC_CNTL_2);
	test &= 0xd;

	switch (gv->depth) {
	   case 1:
	   case 4: /* text */
		HDE = gv->disp_width / 16;
		break;
	   case 8:
		if (gv->pixel_clock > 80000000) {
			clock_mode = 0x10 | 0x02;
			sr15 |= 0x10;
			sr18 |= 0x80;
			cr33 |= 0x20;
		}
		HDE = gv->disp_width / 8;
		break;
	   case 15:
		clock_mode = 0x30;
		HDE = gv->disp_width / 4;
		break;
	   case 16:
		clock_mode = 0x50;
		HDE = gv->disp_width / 4;
		break;
	   case 24:
		clock_mode = 0xd0;
		HDE = (gv->disp_width / 8) * 3;
		break;
	}

	WCrt(ba, CRT_ID_EXT_MISC_CNTL_2, clock_mode | test);
	WSeq(ba, SEQ_ID_CLKSYN_CNTL_2, sr15);
	WSeq(ba, SEQ_ID_RAMDAC_CNTL, sr18);
	WCrt(ba, CRT_ID_BACKWAD_COMP_2, cr33);
	WCrt(ba, CRT_ID_SCREEN_OFFSET, HDE);

	test = RCrt(ba, CRT_ID_EXT_SYS_CNTL_2);
	/* HDE Overflow in bits 4-5 */
	test |= (HDE >> 4) & 0x30;
	WCrt(ba, CRT_ID_EXT_SYS_CNTL_2, test);

	delay(100000);
	WAttr(ba, ACT_ID_ATTR_MODE_CNTL, (TEXT ? 0x0a : 0x41));
	delay(100000);
	WAttr(ba, ACT_ID_COLOR_PLANE_ENA,
	    (gv->depth == 1) ? 0x01 : 0x0f);
	delay(100000);

	/*
	 * Calc. display fifo m and n parameters
	 * Dont't ask me what the hell these values mean.
	 */

	n = 0xff;
	if (gv->depth < 9)
		clock = gv->pixel_clock / 500000.0;
	else if (gv->depth == 15)
		clock = gv->pixel_clock / 250000.0;
	else
		clock = (gv->pixel_clock * (gv->depth / 8)) / 500000.0;

	m = ((int)((55 * .72 + 16.867) * 89.736 / (clock + 39) - 21.1543) / 2) - 1;

	if (m > 31)
		m = 31;
	else if (m <= 0) {
		m = 0;
		n = 16;
	}

	m = m << 3;
	WCrt(ba, CRT_ID_EXT_MEM_CNTL_2, m);
	WCrt(ba, CRT_ID_EXT_MEM_CNTL_3, n);
	delay(10000);

	/* text initialization */

	if (TEXT) {
		cv_inittextmode(gp);
	}

	/* Some kind of Magic */
	WAttr(ba, 0x33, 0);

	/* turn gfx on again */
	gfx_on_off(0, ba);

	/* Pass-through */
	cvscreen(0, ba - READ_OFFSET);

	return (1);
}

void
cv_inittextmode(gp)
	struct grf_softc *gp;
{
	struct grfcvtext_mode *tm = (struct grfcvtext_mode *)gp->g_data;
	volatile unsigned char *ba = gp->g_regkva;
	unsigned char *fb = gp->g_fbkva;
	unsigned char *c, *f, y;
	unsigned short z;


	/* load text font into beginning of display memory.
	 * Each character cell is 32 bytes long (enough for 4 planes)
	 */

	SetTextPlane(ba, 0x02);
	cv_memset(fb, 0, 256 * 32);
	c = (unsigned char *) (fb) + (32 * tm->fdstart);
	f = tm->fdata;
	for (z = tm->fdstart; z <= tm->fdend; z++, c += (32 - tm->fy))
		for (y = 0; y < tm->fy; y++)
			*c++ = *f++;

	/* clear out text/attr planes (three screens worth) */

	SetTextPlane(ba, 0x01);
	cv_memset(fb, 0x07, tm->cols * tm->rows * 3);
	SetTextPlane(ba, 0x00);
	cv_memset(fb, 0x20, tm->cols * tm->rows * 3);

	/* print out a little init msg */

	c = (unsigned char *)(fb) + (tm->cols-16);
	strcpy(c, "CV64");
	c[6] = 0x20;

	/* set colors (B&W) */

	vgaw(ba, VDAC_ADDRESS_W, 0);
	for (z=0; z<256; z++) {
		unsigned char r, g, b;

		y = (z & 1) ? ((z > 7) ? 2 : 1) : 0;

		r = cvconscolors[y][0];
		g = cvconscolors[y][1];
		b = cvconscolors[y][2];
		vgaw(ba, VDAC_DATA, r >> 2);
		vgaw(ba, VDAC_DATA, g >> 2);
		vgaw(ba, VDAC_DATA, b >> 2);
	}
}

void
cv_memset(d, c, l)
	unsigned char *d;
	unsigned char c;
	int l;
{
	for(; l > 0; l--)
		*d++ = c;
}

#endif  /* NGRFCV */