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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include "pci.h"
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#include "vga.h"
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/*
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 * S3 Vision864 GUI Accelerator.
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 * Pretty much the same as the 86C80[15].
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 * First pass, needs tuning.
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 */
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static void
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snarf(Vga* vga, Ctlr* ctlr)
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{
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	s3generic.snarf(vga, ctlr);
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}
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static void
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options(Vga*, Ctlr* ctlr)
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{
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	ctlr->flag |= Hlinear|Hpclk2x8|Henhanced|Foptions;
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}
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static void
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init(Vga* vga, Ctlr* ctlr)
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{
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	ulong x;
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	char *val;
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	s3generic.init(vga, ctlr);
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	vga->crt[0x3B] = vga->crt[0]-5;
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	if(vga->mode->z > 8)
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		error("depth %d not supported\n", vga->mode->z);
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	/*
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	 * VL-bus crap.
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	 */
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	if((vga->crt[0x36] & 0x03) == 0x01){
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		vga->crt[0x40] |= 0x08;
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		vga->crt[0x58] &= ~0x88;
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	}
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	/*
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	 * Display memory access control.
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	 * Calculation of the M-parameter (Crt54) is
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	 * memory-system and dot-clock dependent, the
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	 * values below are guesses from dumping
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	 * registers.
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	 */
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	vga->crt[0x60] = 0xFF;
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	x = vga->mode->x/8;
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	vga->crt[0x61] = 0x80|((x>>8) & 0x07);
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	vga->crt[0x62] = (x & 0xFF);
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	if(vga->mode->x <= 800)
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		vga->crt[0x54] = 0x88;
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	else if(vga->mode->x <= 1024)
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		vga->crt[0x54] = 0xF8;
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	else
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		vga->crt[0x54] = 0x40;
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	vga->crt[0x67] &= ~0xF0;
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	if(ctlr->flag & Upclk2x8)
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		vga->crt[0x67] |= 0x10;
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	vga->crt[0x69] = 0x00;
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	vga->crt[0x6A] = 0x00;
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	/*
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	 * Blank adjust.
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	 * This may not be correct for all monitors.
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	 */
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	vga->crt[0x6D] = 0x00;
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	if(val = dbattr(vga->attr, "delaybl"))
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		vga->crt[0x6D] |= strtoul(val, 0, 0) & 0x07;
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	else
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		vga->crt[0x6D] |= 2;
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	if(val = dbattr(vga->attr, "delaysc"))
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		vga->crt[0x6D] |= (strtoul(val, 0, 0) & 0x07)<<4;
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}
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static void
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load(Vga* vga, Ctlr* ctlr)
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{
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	ushort advfunc;
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	s3generic.load(vga, ctlr);
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	vgaxo(Crtx, 0x60, vga->crt[0x60]);
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	vgaxo(Crtx, 0x61, vga->crt[0x61]);
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	vgaxo(Crtx, 0x62, vga->crt[0x62]);
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	vgaxo(Crtx, 0x67, vga->crt[0x67]);
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	vgaxo(Crtx, 0x69, vga->crt[0x69]);
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	vgaxo(Crtx, 0x6A, vga->crt[0x6A]);
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	vgaxo(Crtx, 0x6D, vga->crt[0x6D]);
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	advfunc = 0x0000;
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	if(ctlr->flag & Uenhanced){
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		if(vga->mode->x == 1024 || vga->mode->x == 800)
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			advfunc = 0x0057;
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		else
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			advfunc = 0x0053;
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	}
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	outportw(0x4AE8, advfunc);
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}
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static void
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dump(Vga* vga, Ctlr* ctlr)
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{
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	s3generic.dump(vga, ctlr);
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}
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Ctlr vision864 = {
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	"vision864",			/* name */
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	snarf,				/* snarf */
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	options,			/* options */
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	init,				/* init */
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	load,				/* load */
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	dump,				/* dump */
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};