ref: f7a16b5e2cc38aed7985b0144bb2655d14ea6f5a
dir: /sys/src/cmd/aux/vga/mach64.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "pci.h"
#include "vga.h"
/*
* ATI Mach64. Some hope. Kind of like a Mach32.
* No support for accelerator so can only do up to 1024x768.
*
* All ATI Extended Registers are addressed using the modified index
* index = (0x02<<6)|(index & 0x3F);
* so registers 0x00->0x3F map to 0x80->0xBF, but we will only ever
* look at a few in the range 0xA0->0xBF. In this way we can stash
* them in the vga->crt[] array.
*/
enum {
Configcntl = 0x6AEC, /* Configuration control */
Configstat = 0x72EC, /* Configuration status */
Memcntl = 0x52EC, /* Memory control */
Scratch1 = 0x46EC, /* Scratch Register (BIOS info) */
};
typedef struct {
ulong configcntl;
ulong configstat;
ulong memcntl;
ulong scratch1;
} Mach64;
/*
* There are a number of possible clock generator chips for these
* boards. We can divide any frequency by 2 (bit<6> of b8).
*/
typedef struct {
ulong frequency;
uchar be; /* <4> - bit<3> of frequency index */
uchar b9; /* <1> - bit<2> of frequency index */
uchar genmo; /* <3:2> - bits <1:0> of frequency index */
} Pclk;
enum {
Npclkx = 16, /* number of clock entries per table */
};
/*
* ATI18811-0
*/
static Pclk ati188110[Npclkx] = {
{ 42950000, 0x00, 0x00, 0x00 },
{ 48770000, 0x00, 0x00, 0x04 },
{ 92400000, 0x00, 0x00, 0x08 },
{ 36000000, 0x00, 0x00, 0x0C },
{ 50350000, 0x00, 0x02, 0x00 },
{ 56640000, 0x00, 0x02, 0x04 },
{ 0, 0x00, 0x02, 0x08 },
{ 44900000, 0x00, 0x02, 0x0C },
{ 30240000, 0x10, 0x00, 0x00 },
{ 32000000, 0x10, 0x00, 0x04 },
{ 110000000, 0x10, 0x00, 0x08 },
{ 80000000, 0x10, 0x00, 0x0C },
{ 39910000, 0x10, 0x02, 0x00 },
{ 44900000, 0x10, 0x02, 0x04 },
{ 75000000, 0x10, 0x02, 0x08 },
{ 65000000, 0x10, 0x02, 0x0C },
};
/*
* ATI18811-1, ATI18811-2
* PCLK_TABLE = 0 in Mach64 speak.
*/
static Pclk ati188111[Npclkx] = {
{ 100000000, 0x00, 0x00, 0x00 },
{ 126000000, 0x00, 0x00, 0x04 },
{ 92400000, 0x00, 0x00, 0x08 },
{ 36000000, 0x00, 0x00, 0x0C },
{ 50350000, 0x00, 0x02, 0x00 },
{ 56640000, 0x00, 0x02, 0x04 },
{ 0, 0x00, 0x02, 0x08 },
{ 44900000, 0x00, 0x02, 0x0C },
{ 135000000, 0x10, 0x00, 0x00 },
{ 32000000, 0x10, 0x00, 0x04 },
{ 110000000, 0x10, 0x00, 0x08 },
{ 80000000, 0x10, 0x00, 0x0C },
{ 39910000, 0x10, 0x02, 0x00 },
{ 44900000, 0x10, 0x02, 0x04 },
{ 75000000, 0x10, 0x02, 0x08 },
{ 65000000, 0x10, 0x02, 0x0C },
};
/*
* ATI18818
* The first four entries are programmable and the default
* settings are either those below or those below divided by 2
* (PCLK_TABLE = 1 and PCLK_TABLE = 2 respectively in Mach64
* speak).
*/
static Pclk ati18818[Npclkx] = {
{ 50350000, 0x00, 0x00, 0x00 },
{ 56640000, 0x00, 0x00, 0x04 },
{ 63000000, 0x00, 0x00, 0x08 },
{ 72000000, 0x00, 0x00, 0x0C },
{ 40000000, 0x00, 0x02, 0x00 },
{ 44900000, 0x00, 0x02, 0x04 },
{ 49500000, 0x00, 0x02, 0x08 },
{ 50000000, 0x00, 0x02, 0x0C },
{ 0, 0x10, 0x00, 0x00 },
{ 110000000, 0x10, 0x00, 0x04 },
{ 126000000, 0x10, 0x00, 0x08 },
{ 135000000, 0x10, 0x00, 0x0C },
{ 0, 0x10, 0x02, 0x00 },
{ 80000000, 0x10, 0x02, 0x04 },
{ 75000000, 0x10, 0x02, 0x08 },
{ 65000000, 0x10, 0x02, 0x0C },
};
static Pclk *pclkp; /* which clock chip we are using */
static ulong atix; /* index to extended regsiters */
static uchar
atixi(uchar index)
{
outportb(atix, index);
return inportb(atix+1);
}
static void
atixo(uchar index, uchar data)
{
outportw(atix, (data<<8)|index);
}
static void
atixinit(Vga* vga, Ctlr*)
{
uchar b;
/*
* Set the I/O address and offset for the ATI
* extended registers to something we know about.
*/
if(atix == 0){
outportw(Grx, (0xCE<<8)|0x50);
outportw(Grx, (0x81<<8)|0x51);
atix = 0x1CE;
}
/*
* Unlock the ATI Extended Registers.
* We leave them unlocked from now on.
* Why does this chip have so many
* lock bits?
*/
if((b = atixi(0xB8)) & 0x3F)
atixo(0xB8, b & 0xC0);
b = atixi(0xAB);
atixo(0xAB, b & ~0x18);
atixo(0xB4, 0x00);
b = atixi(0xB9);
atixo(0xB9, b & ~0x80);
b = atixi(0xBE);
atixo(0xBE, b|0x09);
if(vga->private == 0)
vga->private = alloc(sizeof(Mach64));
}
static void
snarf(Vga* vga, Ctlr* ctlr)
{
int i;
Mach64 *mach64;
atixinit(vga, ctlr);
for(i = 0xA0; i < 0xC0; i++)
vga->crt[i] = atixi(i);
mach64 = vga->private;
mach64->configcntl = inportl(Configcntl);
mach64->configstat = inportl(Configstat);
mach64->memcntl = inportl(Memcntl);
mach64->scratch1 = inportl(Scratch1);
/*
* Memory size.
*/
switch(mach64->memcntl & 0x07){
case 0:
vga->vmz = 512*1024;
break;
case 1:
vga->vmz = 1024*1024;
break;
case 2:
vga->vmz = 2*1024*1024;
break;
case 3:
vga->vmz = 4*1024*1024;
break;
case 4:
vga->vmz = 6*1024*1024;
break;
case 5:
vga->vmz = 8*1024*1024;
break;
}
ctlr->flag |= Fsnarf;
}
static void
init(Vga* vga, Ctlr* ctlr)
{
Mode *mode;
int f, divisor, index;
mode = vga->mode;
/*
* Must somehow determine which clock chip to use here.
* For now, punt and assume ATI18818.
*/
pclkp = ati18818;
if(pclkp == 0)
error("%s: can't determine clock chip\n", ctlr->name);
if(vga->f[0] == 0)
vga->f[0] = vga->mode->frequency;
/*
* Find a clock frequency close to what we want.
* 'Close' is within 1MHz.
*/
for(divisor = 0, index = 0; index < Npclkx; index++, divisor = 0){
divisor = 1;
f = pclkp[index].frequency/divisor;
if(f < vga->f[0]+1000000 && f >= vga->f[0]-1000000)
break;
divisor = 2;
f /= divisor;
if(f < vga->f[0]+1000000 && f >= vga->f[0]-1000000)
break;
}
if(divisor == 0)
error("%s: no suitable clock for %lud\n",
ctlr->name, vga->f[0]);
vga->d[0] = divisor;
vga->i[0] = index;
vga->crt[0xB0] &= 0xDA;
vga->crt[0xB1] &= 0x87;
vga->crt[0xB5] &= 0x7E;
vga->crt[0xB6] &= 0xE2;
vga->crt[0xB3] &= 0xAF;
vga->crt[0xA6] &= 0xFE;
vga->crt[0xA7] &= 0xF4;
/*
* 256-colour linear addressing.
*/
if(mode->z == 8){
vga->graphics[0x05] = 0x00;
vga->attribute[0x10] &= ~0x40;
vga->crt[0x13] = (mode->x/8)/2;
vga->crt[0x14] = 0x00;
vga->crt[0x17] = 0xE3;
vga->crt[0xB0] |= 0x20;
vga->crt[0xB6] |= 0x04;
}
vga->attribute[0x11] = 0x00;
vga->crt[0xB6] |= 0x01;
vga->crt[0xBE] &= ~0x04;
/*
* Do the clock index bits.
*/
vga->crt[0xB8] &= 0x3F;
vga->crt[0xB9] &= 0xFD;
vga->crt[0xBE] &= 0xE5;
if(vga->d[0] == 2)
vga->crt[0xB8] |= 0x40;
vga->crt[0xB9] |= pclkp[vga->i[0]].b9;
vga->crt[0xBE] |= pclkp[vga->i[0]].be;
vga->misc |= pclkp[vga->i[0]].genmo;
if(vga->mode->interlace == 'v')
vga->crt[0xBE] |= 0x02;
/*
* Turn off 128Kb CPU address bit so
* we only have a 64Kb aperture at 0xA0000.
*/
vga->crt[0xBD] &= ~0x04;
ctlr->type = mach32.name;
/*
* The Mach64 can only address 1Mb in VGA mode
*/
vga->vmz = 1*1024*1024;
ctlr->flag |= Finit;
}
static void
load(Vga* vga, Ctlr* ctlr)
{
/*
* We should probably do something here to make sure we that we
* have access to all the video memory through the 64Kb VGA aperture
* by disabling and linear aperture and memory boundary and then
* enabling the VGA controller.
* But for now, let's just assume it's ok, the Mach64 documentation
* is just as clear as the Mach32 documentation.
*/
atixo(0xB0, vga->crt[0xB0]);
atixo(0xB1, vga->crt[0xB1]);
atixo(0xB5, vga->crt[0xB5]);
atixo(0xB6, vga->crt[0xB6]);
atixo(0xB3, vga->crt[0xB3]);
atixo(0xA6, vga->crt[0xA6]);
atixo(0xA7, vga->crt[0xA7]);
atixo(0xB8, vga->crt[0xB8]);
atixo(0xB9, vga->crt[0xB9]);
atixo(0xBE, vga->crt[0xBE]);
vgao(MiscW, vga->misc);
ctlr->flag |= Fload;
}
static void
dump(Vga* vga, Ctlr* ctlr)
{
int i;
Mach64 *mach64;
printitem(ctlr->name, "ATIX");
for(i = 0xA0; i < 0xC0; i++)
printreg(vga->crt[i]);
if((mach64 = vga->private) == 0)
return;
printitem(ctlr->name, "CONFIGCNTL");
Bprint(&stdout, "%.8lux\n", mach64->configcntl);
printitem(ctlr->name, "CONFIGSTAT");
Bprint(&stdout, "%.8lux\n", mach64->configstat);
printitem(ctlr->name, "MEMCNTL");
Bprint(&stdout, "%.8lux\n", mach64->memcntl);
printitem(ctlr->name, "SCRATCH1");
Bprint(&stdout, "%.8lux\n", mach64->scratch1);
}
Ctlr mach64 = {
"mach64", /* name */
snarf, /* snarf */
0, /* options */
init, /* init */
load, /* load */
dump, /* dump */
};