ref: c7d9da8f5a41b833946027c802e0e8d7dd014b22
dir: /sys/src/cmd/aux/vga/3dfx.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "pci.h"
#include "vga.h"
/*
* 3Dfx.
*/
enum {
dramInit0 = 0x018/4,
dramInit1 = 0x01C/4,
vgaInit0 = 0x028/4,
pllCtrl0 = 0x040/4,
pllCtrl1 = 0x044/4,
pllCtrl2 = 0x048/4,
dacMode = 0x04C/4,
vidProcCfg = 0x05C/4,
vidScreenSize = 0x098/4,
vidDesktopOverlayStride = 0x0E8/4,
Nior = 0x100/4,
};
typedef struct Tdfx {
ulong io;
Pcidev* pci;
ulong r[Nior];
} Tdfx;
static ulong
io32r(Tdfx* tdfx, int r)
{
return inportl(tdfx->io+(r*4));
}
static void
io32w(Tdfx* tdfx, int r, ulong l)
{
outportl(tdfx->io+(r*4), l);
}
static void
snarf(Vga* vga, Ctlr* ctlr)
{
int i;
ulong v;
Tdfx *tdfx;
if(vga->private == nil){
tdfx = alloc(sizeof(Tdfx));
tdfx->pci = vga->pci;
if(tdfx->pci == nil)
tdfx->pci = pcimatch(0, 0x121A, 0);
if(tdfx->pci == nil || tdfx->pci->vid != 0x121A)
error("%s: not found\n", ctlr->name);
switch(tdfx->pci->did){
default:
error("%s: unknown chip - DID %4.4uX\n",
ctlr->name, tdfx->pci->did);
break;
case 0x0003: /* Banshee */
vga->f[1] = 270000000;
break;
case 0x0005: /* Avenger (a.k.a. Voodoo3) */
vga->f[1] = 300000000;
break;
case 0x0009: /* Voodoo5 */
vga->f[1] = 350000000;
break;
}
/*
* Frequency output of PLL's is given by
* fout = RefFreq*(n+2)/((m+2)*2^p)
* where there are 6 bits for m, 8 bits for n
* and 2 bits for p (k).
*/
vga->m[1] = 64;
vga->n[1] = 256;
vga->p[1] = 4;
if((v = (tdfx->pci->mem[2].bar & ~0x3)) == 0)
error("%s: I/O not mapped\n", ctlr->name);
tdfx->io = v;
vga->private = tdfx;
}
tdfx = vga->private;
vga->crt[0x1A] = vgaxi(Crtx, 0x1A);
vga->crt[0x1B] = vgaxi(Crtx, 0x1B);
for(i = 0; i < Nior; i++)
tdfx->r[i] = io32r(tdfx, i);
/*
* If SDRAM then there's 16MB memory else it's SGRAM
* and can count it based on the power-on straps -
* chip size can be 8Mb or 16Mb, and there can be 4 or
* 8 of them.
*/
vga->vma = tdfx->pci->mem[1].size;
if(tdfx->r[dramInit1] & 0x40000000)
vga->vmz = 16*1024*1024;
else{
if(tdfx->r[dramInit0] & 0x08000000)
i = 16*1024*1024/8;
else
i = 8*1024*1024/8;
if(tdfx->r[dramInit0] & 0x04000000)
i *= 8;
else
i *= 4;
vga->vmz = i;
}
ctlr->flag |= Fsnarf;
}
static void
options(Vga*, Ctlr* ctlr)
{
ctlr->flag |= Hlinear|Hclk2|Foptions;
}
static void
tdfxclock(Vga* vga, Ctlr*)
{
int d, dmin;
uint f, m, n, p;
dmin = vga->f[0];
for(m = 1; m < vga->m[1]; m++){
for(n = 1; n < vga->n[1]; n++){
f = (RefFreq*(n+2))/(m+2);
for(p = 0; p < vga->p[1]; p++){
d = vga->f[0] - (f/(1<<p));
if(d < 0)
d = -d;
if(d >= dmin)
continue;
dmin = d;
vga->m[0] = m;
vga->n[0] = n;
vga->p[0] = p;
}
}
}
}
static void
init(Vga* vga, Ctlr* ctlr)
{
int x;
Mode *mode;
Tdfx *tdfx;
mode = vga->mode;
tdfx = vga->private;
if(vga->linear && (ctlr->flag & Hlinear))
ctlr->flag |= Ulinear;
/*
* Clock bits. If the desired video clock is
* one of the two standard VGA clocks or 50MHz it can just be
* set using bits <3:2> of vga->misc, otherwise we
* need to programme the PLL.
*/
if(vga->f[0] == 0)
vga->f[0] = mode->frequency;
vga->misc &= ~0x0C;
if(vga->f[0] == VgaFreq0){
/* nothing to do */;
}
else if(vga->f[0] == VgaFreq1)
vga->misc |= 0x04;
else if(vga->f[0] == 50000000)
vga->misc |= 0x08;
else{
if(vga->f[0] > vga->f[1])
error("%s: invalid pclk - %lud\n",
ctlr->name, vga->f[0]);
if(vga->f[0] > 135000000 && (ctlr->flag & Hclk2)){
if(mode->x%16)
error("%s: f > 135MHz requires (x%%16) == 0\n",
ctlr->name);
ctlr->flag |= Uclk2;
}
tdfxclock(vga, ctlr);
tdfx->r[pllCtrl0] = (vga->n[0]<<8)|(vga->m[0]<<2)|vga->p[0];
vga->misc |= 0x0C;
}
/*
* Pixel format and memory stride.
*/
tdfx->r[vidScreenSize] = (mode->y<<12)|mode->x;
tdfx->r[vidProcCfg] = 0x00000081;
switch(mode->z){
default:
error("%s: %d-bit mode not supported\n", ctlr->name, mode->z);
break;
case 8:
tdfx->r[vidDesktopOverlayStride] = mode->x;
break;
case 16:
tdfx->r[vidDesktopOverlayStride] = mode->x*2;
tdfx->r[vidProcCfg] |= 0x00040400;
break;
case 32:
tdfx->r[vidDesktopOverlayStride] = mode->x*4;
tdfx->r[vidProcCfg] |= 0x000C0400;
break;
}
tdfx->r[vgaInit0] = 0x140;
/*
* Adjust horizontal timing if doing two screen pixels per clock.
*/
tdfx->r[dacMode] = 0;
if(ctlr->flag & Uclk2){
vga->crt[0x00] = ((mode->ht/2)>>3)-5;
vga->crt[0x01] = ((mode->x/2)>>3)-1;
vga->crt[0x02] = ((mode->shb/2)>>3)-1;
x = (mode->ehb/2)>>3;
vga->crt[0x03] = 0x80|(x & 0x1F);
vga->crt[0x04] = (mode->shs/2)>>3;
vga->crt[0x05] = ((mode->ehs/2)>>3) & 0x1F;
if(x & 0x20)
vga->crt[0x05] |= 0x80;
tdfx->r[dacMode] |= 0x01;
tdfx->r[vidProcCfg] |= 0x04000000;
}
/*
* Overflow.
*/
vga->crt[0x1A] = 0x00;
if(vga->crt[0x00] & 0x100)
vga->crt[0x1A] |= 0x01;
if(vga->crt[0x01] & 0x100)
vga->crt[0x1A] |= 0x04;
if(vga->crt[0x03] & 0x100)
vga->crt[0x1A] |= 0x10;
x = mode->ehb;
if(ctlr->flag & Uclk2)
x /= 2;
if((x>>3) & 0x40)
vga->crt[0x1A] |= 0x20;
if(vga->crt[0x04] & 0x100)
vga->crt[0x1A] |= 0x40;
x = mode->ehs;
if(ctlr->flag & Uclk2)
x /= 2;
if((x>>3) & 0x20)
vga->crt[0x1A] |= 0x80;
vga->crt[0x1B] = 0x00;
if(vga->crt[0x06] & 0x400)
vga->crt[0x1B] |= 0x01;
if(vga->crt[0x12] & 0x400)
vga->crt[0x1B] |= 0x04;
if(vga->crt[0x15] & 0x400)
vga->crt[0x1B] |= 0x10;
if(vga->crt[0x10] & 0x400)
vga->crt[0x1B] |= 0x40;
vga->attribute[0x11] = Pblack;
ctlr->flag |= Finit;
}
static void
load(Vga* vga, Ctlr* ctlr)
{
Tdfx *tdfx;
vgaxo(Crtx, 0x1A, vga->crt[0x1A]);
vgaxo(Crtx, 0x1B, vga->crt[0x1B]);
tdfx = vga->private;
io32w(tdfx, dacMode, tdfx->r[dacMode]);
io32w(tdfx, vidScreenSize, tdfx->r[vidScreenSize]);
io32w(tdfx, vidDesktopOverlayStride, tdfx->r[vidDesktopOverlayStride]);
io32w(tdfx, vidProcCfg, tdfx->r[vidProcCfg]);
io32w(tdfx, vgaInit0, tdfx->r[vgaInit0]);
if((vga->misc & 0x0C) == 0x0C)
io32w(tdfx, pllCtrl0, tdfx->r[pllCtrl0]);
ctlr->flag |= Fload;
}
static uint
pllctrl(Tdfx* tdfx, int pll)
{
uint k, m, n, r;
r = tdfx->r[pllCtrl0+pll];
k = r & 0x03;
m = (r>>2) & 0x3F;
n = (r>>8) & 0xFF;
return (RefFreq*(n+2))/((m+2)*(1<<k));
}
static void
dump(Vga* vga, Ctlr* ctlr)
{
int i;
Tdfx *tdfx;
if((tdfx = vga->private) == nil)
return;
printitem(ctlr->name, "Crt1A");
printreg(vga->crt[0x1A]);
printreg(vga->crt[0x1B]);
Bprint(&stdout, "\n");
for(i = 0; i < Nior; i++)
Bprint(&stdout, "%s %2.2uX\t%.8luX\n",
ctlr->name, i*4, tdfx->r[i]);
printitem(ctlr->name, "pllCtrl");
Bprint(&stdout, "%9ud %8ud\n", pllctrl(tdfx, 0), pllctrl(tdfx, 1));
}
Ctlr tdfx = {
"3dfx", /* name */
snarf, /* snarf */
options, /* options */
init, /* init */
load, /* load */
dump, /* dump */
};
Ctlr tdfxhwgc = {
"3dfxhwgc", /* name */
0, /* snarf */
0, /* options */
0, /* init */
0, /* load */
0, /* dump */
};