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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/cmd/aux/vga/ch9294.c – Rev 2

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/*
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 * Chrontel
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 * CH9294 Dual Enhanced Graphics Clock Generator.
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 */
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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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typedef struct {
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	char*	name[2];
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	ulong	frequency[16];
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} Pattern;
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static Pattern patterns[] = {
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	{ "e", "E",		/* Tseng */
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	 50350000,  56644000,  65000000,  72000000,  80000000,  89800000,  63000000,  75000000,
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	 VgaFreq0,  VgaFreq1,  31500000,  36000000,  40000000,  44900000,  50000000,  65000000,
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	},
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	{ "g", "G",		/* S3, IIT */
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	 VgaFreq0,  VgaFreq1,  40000000,  72000000,  50000000,  77000000,  36000000,  44900000,
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	130000000, 120000000,  80000000,  31500000, 110000000,  65000000,  75000000,  94500000,
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	},
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	{ "k", "K",		/* Avance Logic */
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	 50350000,  56644000,  89800000,  72000000,  75000000,  65000000,  63000000,  80000000,
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	 57272000,  85000000,  94000000,  96000000, 100000000, 108000000, 110000000,  77000000,
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	},
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	{ 0,
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	},
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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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	Pattern *pattern;
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	char *p;
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	int f, fmin, index, divisor, maxdivisor;
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	if(ctlr->flag & Finit)
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		return;
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	if(vga->f[0] == 0)
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		vga->f[0] = vga->mode->frequency;
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	if((p = strchr(ctlr->name, '-')) == 0)
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		error("%s: unknown pattern\n", ctlr->name);
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	p++;
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	for(pattern = patterns; pattern->name[0]; pattern++){
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		if(strcmp(pattern->name[0], p) == 0)
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			break;
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		if(pattern->name[1] && strcmp(pattern->name[1], p) == 0)
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			break;
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	}
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	if(pattern->name[0] == 0)
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		error("%s: unknown pattern\n", ctlr->name);
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	maxdivisor = 1;
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	if(vga->ctlr && (vga->ctlr->flag & Hclkdiv))
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		maxdivisor = 8;
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	fmin = vga->f[0];
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	for(index = 0; index < 16; index++){
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		for(divisor = 1; divisor <= maxdivisor; divisor <<= 1){
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			f = vga->f[0] - pattern->frequency[index]/divisor;
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			if(f < 0)
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				f = -f;
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			if(f < fmin){
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				/*vga->f = pattern->frequency[index];*/
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				fmin = f;
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				vga->d[0] = divisor;
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				vga->i[0] = index;
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			}
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		}
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	}
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	if(fmin > (vga->f[0]*5)/100)
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		error("%s: can't find frequency %ld\n", ctlr->name, vga->f[0]);
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	ctlr->flag |= Finit;
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}
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Ctlr ch9294 = {
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	"ch9294",			/* name */
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	0,				/* snarf */
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	0,				/* options */
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	init,				/* init */
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	0,				/* load */
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	0,				/* dump */
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};