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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 Vision964 GUI Accelerator.
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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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	vga->crt[0x22] = vgaxi(Crtx, 0x22);
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	vga->crt[0x24] = vgaxi(Crtx, 0x24);
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	vga->crt[0x26] = vgaxi(Crtx, 0x26);
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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|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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	Mode *mode;
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	ulong x;
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	int sid, dbl, bpp, divide;
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	char *val;
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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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	mode = vga->mode;
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	if(vga->ramdac && (vga->ramdac->flag & Uclk2)){
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		resyncinit(vga, ctlr, Uenhanced, 0);
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		vga->crt[0x00] = ((mode->ht/2)>>3)-5;
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		vga->crt[0x01] = ((mode->x/2)>>3)-1;
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		vga->crt[0x02] = ((mode->shb/2)>>3)-1;
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		x = (mode->ehb/2)>>3;
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		vga->crt[0x03] = 0x80|(x & 0x1F);
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		vga->crt[0x04] = (mode->shs/2)>>3;
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		vga->crt[0x05] = ((mode->ehs/2)>>3) & 0x1F;
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		if(x & 0x20)
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			vga->crt[0x05] |= 0x80;
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		vga->crt[0x13] = mode->x/8;
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	}
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	else if(mode->z == 8)
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		resyncinit(vga, ctlr, Uenhanced, 0);
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	s3generic.init(vga, ctlr);
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	/*
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	if((ctlr->flag & Uenhanced) == 0)
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		vga->crt[0x33] &= ~0x20;
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	 */
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	vga->crt[0x3B] = (vga->crt[0]+vga->crt[4]+1)/2;
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	if(vga->crt[0x3B] & 0x100)
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		vga->crt[0x5D] |= 0x40;
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	vga->crt[0x55] = 0x00;
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	vga->crt[0x40] &= ~0x10;
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	vga->crt[0x53] &= ~0x20;
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	vga->crt[0x58] &= ~0x48;
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	if(dbattr(vga->attr, "sam512") == 0)
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		vga->crt[0x58] |= 0x40;		/* set 256 word SAM, always works */
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	vga->crt[0x65] = 0x00;
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	vga->crt[0x66] &= ~0x07;
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	vga->crt[0x6D] = 0x00;
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	if(ctlr->flag & Uenhanced){
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		if(vga->ramdac && (vga->ramdac->flag & Hsid32))
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			sid = 32;
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		else
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			sid = 64;
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		if(vga->ramdac && (vga->ramdac->flag & Uclk2))
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			dbl = 2;
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		else
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			dbl = 1;
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		if(mode->z < 4)
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			bpp = 4;
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		else
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			bpp = mode->z;
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		divide = sid/(dbl*bpp);
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		switch(divide){
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		case 2:
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			vga->crt[0x66] |= 0x01;
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			break;
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		case 4:
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			vga->crt[0x66] |= 0x02;
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			break;
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		case 8:
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			vga->crt[0x66] |= 0x03;
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			break;
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		case 16:
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			vga->crt[0x66] |= 0x04;
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			break;
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		case 32:
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			vga->crt[0x66] |= 0x05;
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			break;
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		}
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		vga->crt[0x40] |= 0x10;
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		vga->crt[0x65] |= 0x02;
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		if(vga->ramdac && (vga->ramdac->flag & Hsid32))
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			vga->crt[0x66] |= 0x10;
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		/*
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		 * Some heuristics (what part of aux/vga isn't?)
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		 * to prevent some of the right border appearing
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		 * on the left edge of the screen.
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		 */
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		if(dbattr(vga->attr, "vclkphs"))
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			vga->crt[0x67] |= 0x01;
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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 if(mode->x > 1024)
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			vga->crt[0x6D] |= 0x01;
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		else
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			vga->crt[0x6D] |= 0x03;
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123 
		if(val = dbattr(vga->attr, "delaysc"))
124 
			vga->crt[0x6D] |= (strtoul(val, 0, 0) & 0x07)<<4;
125 
	}
126 
}
127 
 
128 
static void
129 
load(Vga* vga, Ctlr* ctlr)
130 
{
131 
	ushort advfunc;
132 
 
133 
	s3generic.load(vga, ctlr);
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	vgaxo(Crtx, 0x65, vga->crt[0x65]);
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	vgaxo(Crtx, 0x66, vga->crt[0x66]);
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	vgaxo(Crtx, 0x6D, vga->crt[0x6D]);
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138 
	advfunc = 0x0000;
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	if(ctlr->flag & Uenhanced)
140 
		advfunc = 0x0001;
141 
	outportw(0x4AE8, advfunc);
142 
}
143 
 
144 
static void
145 
dump(Vga* vga, Ctlr* ctlr)
146 
{
147 
	s3generic.dump(vga, ctlr);
148 
	printitem(ctlr->name, "Crt22");
149 
	printreg(vga->crt[0x22]);
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	printitem(ctlr->name, "Crt24");
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	printreg(vga->crt[0x24]);
152 
	printitem(ctlr->name, "Crt26");
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	printreg(vga->crt[0x26]);
154 
}
155 
 
156 
Ctlr vision964 = {
157 
	"vision964",			/* name */
158 
	snarf,				/* snarf */
159 
	options,			/* options */
160 
	init,				/* init */
161 
	load,				/* load */
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	dump,				/* dump */
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};