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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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 * Sierra SC1502[56] HiCOLOR-24 Palette.
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 */
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static void
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pixmask(void)
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{
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	inportb(PaddrW);
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}
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static void
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commandrw(void)
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{
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	int i;
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	pixmask();
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	for(i = 0; i < 4; i++)
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		inportb(Pixmask);
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}
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static uchar
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commandr(void)
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{
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	uchar command;
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	commandrw();
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	command = inportb(Pixmask);
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	pixmask();
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	return command;
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}
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static void
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commandw(uchar command)
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{
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	commandrw();
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	outportb(Pixmask, command);
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	pixmask();
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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 |= 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 pclk;
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	char *p;
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	/*
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	 * Part comes in -125, -110, -80, and -66MHz speed-grades.
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	 * Work out the part speed-grade from name.  Name can have,
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	 * e.g. '-110' on the end  for 100MHz part.
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	 */
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	pclk = 66000000;
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	if(p = strrchr(ctlr->name, '-'))
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		pclk = strtoul(p+1, 0, 0) * 1000000;
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	/*
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	 * If we don't already have a desired pclk,
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	 * take it from the mode.
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	 * Check it's within range.
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	 */
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	if(vga->f[0] == 0)
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		vga->f[0] = vga->mode->frequency;
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	if(vga->f[0] > pclk)
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		error("%s: invalid pclk - %ld\n", ctlr->name, vga->f[0]);
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}
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static void
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load(Vga*, Ctlr*)
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{
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	uchar aux, command;
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	aux = 0x00;
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	/*
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	if(vga->mode->z == 8)
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		aux = 0x01;
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	 */
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	commandrw();
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	command = inportb(Pixmask);
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	outportb(Pixmask, command|0x18);
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	outportb(PaddrR, 0x08);
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	outportb(PaddrW, aux);
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	commandw(command);
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}
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static void
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dump(Vga*, Ctlr* ctlr)
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{
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	int i;
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	uchar command;
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	printitem(ctlr->name, "command");
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	command = commandr();
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	printreg(command);
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	printitem(ctlr->name, "index08");
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	commandw(command|0x10);
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	for(i = 0x08; i < 0x11; i++){
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		outportb(PaddrR, i);
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		printreg(inportb(PaddrW));
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	}
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	commandw(command);
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}
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Ctlr sc15025 = {
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	"sc15025",			/* name */
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	0,				/* 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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};