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#include <u.h>
#include <libc.h>
#include <bio.h>
#include "pci.h"
#include "vga.h"
/*
* ATT20C490 and ATT20C49[12] True-Color CMOS RAMDACs.
*/
enum {
Cr0 = 0x00, /* Control register 0 */
};
static void
init(Vga* vga, Ctlr* ctlr)
{
ulong pclk;
char *p;
/*
* Part comes in -100, -80, -65 and -55MHz speed-grades.
* Work out the part speed-grade from name. Name can have,
* e.g. '-100' on the end for 100MHz part.
*/
pclk = 55000000;
if(p = strrchr(ctlr->name, '-'))
pclk = strtoul(p+1, 0, 0) * 1000000;
/*
* If we don't already have a desired pclk,
* take it from the mode.
* Check it's within range.
*/
if(vga->f == 0)
vga->f[0] = vga->mode->frequency;
if(vga->f[0] > pclk)
error("%s: invalid pclk - %ld\n", ctlr->name, vga->f[0]);
}
static void
load(Vga* vga, Ctlr* ctlr)
{
uchar mode, x;
/*
* Put the chip to sleep if possible.
*/
if(ctlr->name[8] == '1'){
x = attdaci(Cr0);
attdaco(Cr0, x|0x04);
}
/*
* Set the mode in the RAMDAC, setting 6/8-bit colour
* as appropriate and waking the chip back up.
*/
mode = 0x00;
if(vga->mode->z == 8 && ctlr->name[8] == '1' && 0)
mode |= 0x02;
attdaco(Cr0, mode);
}
static void
dump(Vga*, Ctlr* ctlr)
{
printitem(ctlr->name, "Cr0");
printreg(attdaci(Cr0));
}
Ctlr att20c490 = {
"att20c490", /* name */
0, /* snarf */
0, /* options */
init, /* init */
load, /* load */
dump, /* dump */
};
Ctlr att20c491 = {
"att20c491", /* name */
0, /* snarf */
0, /* options */
init, /* init */
load, /* load */
dump, /* dump */
};
Ctlr att20c492 = {
"att20c492", /* name */
0, /* snarf */
0, /* options */
init, /* init */
load, /* load */
dump, /* dump */
};
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