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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 86C928 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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}
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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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	/*
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	 * s3generic.init() will perform the same test.
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	 * We need to do it here too so that the Crt registers
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	 * will be correct when s3generic.init() calculates
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	 * the overflow bits.
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	 */
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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((ctlr->flag & Henhanced) && mode->x >= 1024 && mode->z == 8){
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		resyncinit(vga, ctlr, Uenhanced, 0);
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		vga->crt[0x00] = ((mode->ht/4)>>3)-5;
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		vga->crt[0x01] = ((mode->x/4)>>3)-1;
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		vga->crt[0x02] = ((mode->shb/4)>>3)-1;
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		x = (mode->ehb/4)>>3;
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		vga->crt[0x03] = 0x80|(x & 0x1F);
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		vga->crt[0x04] = (mode->shs/4)>>3;
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		vga->crt[0x05] = ((mode->ehs/4)>>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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		if(mode->z == 1)
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			vga->crt[0x13] /= 8;
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	}
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	s3generic.init(vga, ctlr);
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	vga->crt[0x3B] = (vga->crt[0]+vga->crt[4]+1)/2;
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	/*
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	 * Set up write-posting and read-ahead-cache.
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	 */
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	vga->crt[0x54] = 0xA7;
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	if(ctlr->flag & Uenhanced){
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		vga->crt[0x58] |= 0x04;
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		vga->crt[0x40] |= 0x08;
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	}
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	else{
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		vga->crt[0x58] &= ~0x04;
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		vga->crt[0x40] &= ~0x08;
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	}
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	/*
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	 * Set up parallel VRAM and the external
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	 * SID enable on the 86C928
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	 */
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	vga->crt[0x53] &= ~0x20;			/* parallel VRAM */
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	vga->crt[0x55] &= ~0x48;			/* external SID */
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	vga->crt[0x65] &= ~0x60;			/* 2 86C928 E-step chip bugs */
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	if(ctlr->flag & Uenhanced){
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		if(vga->ramdac->flag & Hpvram)
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			vga->crt[0x53] |= 0x20;
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		if(vga->ramdac->flag & Hextsid)
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			vga->crt[0x55] |= 0x48;
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		vga->crt[0x65] |= 0x60;
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	}
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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, 0x65, vga->crt[0x65]);
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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 s3928 = {
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	"s3928",			/* 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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};