Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <bio.h>

#include "pci.h"
#include "vga.h"

/*
 * S3 86C928 GUI Accelerator.
 */
static void
snarf(Vga* vga, Ctlr* ctlr)
{
        s3generic.snarf(vga, ctlr);
}

static void
options(Vga*, Ctlr* ctlr)
{
        ctlr->flag |= Hlinear|Henhanced|Foptions;
}

static void
init(Vga* vga, Ctlr* ctlr)
{
        Mode *mode;
        ulong x;

        /*
         * s3generic.init() will perform the same test.
         * We need to do it here too so that the Crt registers
         * will be correct when s3generic.init() calculates
         * the overflow bits.
         */
        if(vga->mode->z > 8)
                error("depth %d not supported\n", vga->mode->z);

        mode = vga->mode;
        if((ctlr->flag & Henhanced) && mode->x >= 1024 && mode->z == 8){
                resyncinit(vga, ctlr, Uenhanced, 0);
                vga->crt[0x00] = ((mode->ht/4)>>3)-5;
                vga->crt[0x01] = ((mode->x/4)>>3)-1;
                vga->crt[0x02] = ((mode->shb/4)>>3)-1;
        
                x = (mode->ehb/4)>>3;
                vga->crt[0x03] = 0x80|(x & 0x1F);
                vga->crt[0x04] = (mode->shs/4)>>3;
                vga->crt[0x05] = ((mode->ehs/4)>>3) & 0x1F;
                if(x & 0x20)
                        vga->crt[0x05] |= 0x80;

                vga->crt[0x13] = mode->x/8;
                if(mode->z == 1)
                        vga->crt[0x13] /= 8;
        }
        s3generic.init(vga, ctlr);
        vga->crt[0x3B] = (vga->crt[0]+vga->crt[4]+1)/2;

        /*
         * Set up write-posting and read-ahead-cache.
         */
        vga->crt[0x54] = 0xA7;
        if(ctlr->flag & Uenhanced){
                vga->crt[0x58] |= 0x04;
                vga->crt[0x40] |= 0x08;
        }
        else{
                vga->crt[0x58] &= ~0x04;
                vga->crt[0x40] &= ~0x08;
        }

        /*
         * Set up parallel VRAM and the external
         * SID enable on the 86C928
         */
        vga->crt[0x53] &= ~0x20;                        /* parallel VRAM */
        vga->crt[0x55] &= ~0x48;                        /* external SID */
        vga->crt[0x65] &= ~0x60;                        /* 2 86C928 E-step chip bugs */
        if(ctlr->flag & Uenhanced){
                if(vga->ramdac->flag & Hpvram)
                        vga->crt[0x53] |= 0x20;
                if(vga->ramdac->flag & Hextsid)
                        vga->crt[0x55] |= 0x48;
                vga->crt[0x65] |= 0x60;
        }
}

static void
load(Vga* vga, Ctlr* ctlr)
{
        ushort advfunc;

        (*s3generic.load)(vga, ctlr);
        vgaxo(Crtx, 0x65, vga->crt[0x65]);

        advfunc = 0x0000;
        if(ctlr->flag & Uenhanced){
                if(vga->mode->x == 1024 || vga->mode->x == 800)
                        advfunc = 0x0057;
                else
                        advfunc = 0x0053;
        }
        outportw(0x4AE8, advfunc);
}

static void
dump(Vga* vga, Ctlr* ctlr)
{
        (*s3generic.dump)(vga, ctlr);
}

Ctlr s3928 = {
        "s3928",                        /* name */
        snarf,                          /* snarf */
        options,                        /* options */
        init,                           /* init */
        load,                           /* load */
        dump,                           /* dump */
};