Subversion Repositories planix.SVN

#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 */
};