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#include <u.h>
#include <libc.h>
#include <bio.h>
#include "pci.h"
#include "vga.h"
/*
* SGS-Thompson STG1702 Enhanced True Color Palette-DAC
* with 16-bit Pixel Port.
*/
enum {
Command = 0x00, /* Pixel Command Register */
IndexLO = 0x01, /* LO-byte of 16-bit Index */
IndexHI = 0x02, /* HI-byte of 16-bit Index */
Index = 0x03, /* Indexed Register */
CompanyID = 0x00, /* Company ID = 0x44 */
DeviceID = 0x01, /* Device ID = 0x02 */
Pmode = 0x03, /* Primary Pixel Mode Select */
Smode = 0x04, /* Secondary Pixel Mode Select */
Pipeline = 0x05, /* Pipeline Timing Control */
Sreset = 0x06, /* Soft Reset */
Power = 0x07, /* Power Management */
Nindex = 0x08,
};
static void
pixmask(void)
{
inportb(PaddrW);
}
static void
commandrw(void)
{
int i;
pixmask();
for(i = 0; i < 4; i++)
inportb(Pixmask);
}
static uchar
commandr(void)
{
uchar command;
commandrw();
command = inportb(Pixmask);
pixmask();
return command;
}
static void
commandw(uchar command)
{
commandrw();
outportb(Pixmask, command);
pixmask();
}
static void
indexrw(uchar index)
{
uchar command;
command = commandr();
commandw(command|0x10);
commandrw();
inportb(Pixmask);
outportb(Pixmask, index & 0xFF);
outportb(Pixmask, (index>>8) & 0xFF);
}
static void
options(Vga*, Ctlr* ctlr)
{
ctlr->flag |= Hpclk2x8|Foptions;
}
static void
init(Vga* vga, Ctlr* ctlr)
{
ulong pclk;
/*
* Part comes in -135MHz speed-grade.
* In 8-bit mode the max. PCLK is 110MHz. In 2x8-bit mode
* the max. PCLK is the speed-grade, using the 2x doubler.
* We can use mode 2 (2x8-bit, internal clock doubler)
* if connected to a suitable graphics chip, e.g. the
* ET4000-w32p.
*/
if(vga->ctlr && ((vga->ctlr->flag & Hpclk2x8) && vga->mode->z == 8))
pclk = 135000000;
else
pclk = 110000000;
/*
* If we don't already have a desired pclk,
* take it from the mode.
* Check it's within range.
*/
if(vga->f[0] == 0)
vga->f[0] = vga->mode->frequency;
if(vga->f[0] < 16000000 || vga->f[0] > pclk)
error("%s: invalid pclk - %ld\n", ctlr->name, vga->f[0]);
/*
* Determine whether to use 2x8-bit mode or not.
* If yes and the clock has already been initialised,
* initialise it again.
*/
if(vga->ctlr && (vga->ctlr->flag & Hpclk2x8) && vga->mode->z == 8 && vga->f[0] >= 110000000){
vga->f[0] /= 2;
resyncinit(vga, ctlr, Upclk2x8, 0);
}
ctlr->flag |= Finit;
}
static void
load(Vga* vga, Ctlr* ctlr)
{
uchar command, mode, pipeline;
command = 0x00;
mode = 0x00;
pipeline = 0x02;
if(ctlr->flag & Upclk2x8){
command = 0x08;
mode = 0x05;
pipeline = 0x02;
if(vga->f[0] < 16000000)
pipeline = 0x00;
else if(vga->f[0] < 32000000)
pipeline = 0x01;
}
indexrw(Pmode);
outportb(Pixmask, mode);
outportb(Pixmask, mode);
outportb(Pixmask, pipeline);
sleep(1);
commandw(command);
ctlr->flag |= Fload;
}
static void
dump(Vga*, Ctlr* ctlr)
{
int i;
printitem(ctlr->name, "command");
printreg(commandr());
printitem(ctlr->name, "index");
indexrw(CompanyID);
for(i = 0; i < Nindex; i++)
printreg(inportb(Pixmask));
pixmask();
}
Ctlr stg1702 = {
"stg1702", /* name */
0, /* snarf */
options, /* options */
init, /* init */
load, /* load */
dump, /* dump */
};
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