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/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/trident/tridenthelper.c,v 1.9 1999/06/20 07:14:39 dawes Exp $ */
#include "xf86.h"
#include "xf86_OSproc.h"
#include "xf86_ansic.h"
#include "xf86Version.h"
#include "xf86PciInfo.h"
#include "xf86Pci.h"
#include "vgaHW.h"
#include "trident.h"
#include "trident_regs.h"
static void IsClearTV(ScrnInfoPtr pScrn);
void
TGUISetClock(ScrnInfoPtr pScrn, int clock, CARD8 *a, CARD8 *b)
{
TRIDENTPtr pTrident = TRIDENTPTR(pScrn);
int powerup[4] = { 1,2,4,8 };
int clock_diff = 750;
int freq, ffreq;
int m, n, k;
int p, q, r, s;
int startn, endn;
int endm, endk;
p = q = r = s = 0;
IsClearTV(pScrn);
if (pTrident->NewClockCode)
{
startn = 64;
endn = 255;
endm = 63;
endk = 3;
}
else
{
startn = 0;
endn = 121;
endm = 31;
endk = 1;
}
freq = clock;
for (k=0;k<=endk;k++)
for (n=startn;n<=endn;n++)
for (m=1;m<=endm;m++)
{
ffreq = ( ( ((n + 8) * pTrident->frequency) / ((m + 2) * powerup[k]) ) * 1000);
if ((ffreq > freq - clock_diff) && (ffreq < freq + clock_diff))
{
/*
* It seems that the 9440 docs have this STRICT limitation, although
* most 9440 boards seem to cope. 96xx/Cyber chips don't need this limit
* so, I'm gonna remove it and it allows lower clocks < 25.175 too !
*/
#ifdef STRICT
if ( (n+8)*100/(m+2) < 978 && (n+8)*100/(m+2) > 349 ) {
#endif
clock_diff = (freq > ffreq) ? freq - ffreq : ffreq - freq;
p = n; q = m; r = k; s = ffreq;
#ifdef STRICT
}
#endif
}
}
if (s == 0)
{
FatalError("Unable to set programmable clock.\n"
"Frequency %d is not a valid clock.\n"
"Please modify XF86Config for a new clock.\n",
freq);
}
if (pTrident->NewClockCode)
{
/* N is all 8bits */
*a = p;
/* M is first 6bits, with K last 2bits */
*b = (q & 0x3F) | (r << 6);
}
else
{
/* N is first 7bits, first M bit is 8th bit */
*a = ((1 & q) << 7) | p;
/* first 4bits are rest of M, 1bit for K value */
*b = (((q & 0xFE) >> 1) | (r << 4));
}
}
static void
IsClearTV(ScrnInfoPtr pScrn)
{
int vgaIOBase = VGAHWPTR(pScrn)->IOBase;
TRIDENTPtr pTrident = TRIDENTPTR(pScrn);
CARD8 temp;
if (pTrident->frequency != 0) return;
MMIO_OUTB(vgaIOBase + 4, 0xC0);
temp = MMIO_INB(vgaIOBase + 5);
if (temp & 0x80)
pTrident->frequency = PAL;
else
pTrident->frequency = NTSC;
}
float
CalculateMCLK(ScrnInfoPtr pScrn)
{
int vgaIOBase = VGAHWPTR(pScrn)->IOBase;
TRIDENTPtr pTrident = TRIDENTPTR(pScrn);
int a,b;
int m,n,k;
float freq = 0.0;
int powerup[4] = { 1,2,4,8 };
CARD8 temp;
if (pTrident->HasSGRAM) {
MMIO_OUTB(vgaIOBase + 4, 0x28);
switch(MMIO_INB(vgaIOBase + 5) & 0x07) {
case 0:
freq = 60;
break;
case 1:
freq = 78;
break;
case 2:
freq = 90;
break;
case 3:
freq = 120;
break;
case 4:
freq = 66;
break;
case 5:
freq = 83;
break;
case 6:
freq = 100;
break;
case 7:
freq = 132;
break;
}
} else {
MMIO_OUTB(0x3C4, NewMode1);
temp = MMIO_INB(0x3C5);
MMIO_OUTB(0x3C5, 0xC2);
if (!Is3Dchip) {
a = MMIO_INB(0x43C6);
b = MMIO_INB(0x43C7);
} else {
MMIO_OUTB(0x3C4, 0x16);
a = MMIO_INB(0x3C5);
MMIO_OUTB(0x3C4, 0x17);
b = MMIO_INB(0x3C5);
}
MMIO_OUTB(0x3C4, NewMode1);
MMIO_OUTB(0x3C5, temp);
IsClearTV(pScrn);
if (pTrident->NewClockCode) {
m = b & 0x3F;
n = a;
k = (b & 0xC0) >> 6;
} else {
m = (a & 0x07);
k = (b & 0x02) >> 1;
n = ((a & 0xF8)>>3)|((b&0x01)<<5);
}
freq = ((n+8)*pTrident->frequency)/((m+2)*powerup[k]);
}
return (freq);
}
void
TGUISetMCLK(ScrnInfoPtr pScrn, int clock, CARD8 *a, CARD8 *b)
{
TRIDENTPtr pTrident = TRIDENTPTR(pScrn);
int powerup[4] = { 1,2,4,8 };
int clock_diff = 750;
int freq, ffreq;
int m,n,k;
int p, q, r, s;
int startn, endn;
int endm, endk;
p = q = r = s = 0;
IsClearTV(pScrn);
if (pTrident->NewClockCode)
{
startn = 64;
endn = 255;
endm = 63;
endk = 3;
}
else
{
startn = 0;
endn = 121;
endm = 31;
endk = 1;
}
freq = clock;
if (!pTrident->HasSGRAM) {
for (k=0;k<=endk;k++)
for (n=startn;n<=endn;n++)
for (m=1;m<=endm;m++) {
ffreq = ((((n+8)*pTrident->frequency)/((m+2)*powerup[k]))*1000);
if ((ffreq > freq - clock_diff) && (ffreq < freq + clock_diff))
{
clock_diff = (freq > ffreq) ? freq - ffreq : ffreq - freq;
p = n; q = m; r = k; s = ffreq;
}
}
if (s == 0)
{
FatalError("Unable to set memory clock.\n"
"Frequency %d is not a valid clock.\n"
"Please modify XF86Config for a new clock.\n",
freq);
}
if (pTrident->NewClockCode)
{
/* N is all 8bits */
*a = p;
/* M is first 6bits, with K last 2bits */
*b = (q & 0x3F) | (r << 6);
}
else
{
/* N is first 7bits, first M bit is 8th bit */
*a = ((1 & q) << 7) | p;
/* first 4bits are rest of M, 1bit for K value */
*b = (((q & 0xFE) >> 1) | (r << 4));
}
}
}
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