Subversion Repositories planix.SVN

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

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

/*
 * IC Works W30C516 ZOOMDAC.
 * DSP-based Multimedia RAMDAC.
 */
enum {
        Cr0             = 0x00,         /* Control register 0 */
        Mid             = 0x01,         /* Manufacturer's identification register */
        Did             = 0x02,         /* Device identification register */
        Cr1             = 0x03,         /* Control register 1 */

        Reserve1        = 0x04,         /* Reserved (16-bit) */
        Reserve2        = 0x06,         /* Reserved (16-bit) */
        Reserve3        = 0x08,         /* Reserved (16-bit) */
        Reserve4        = 0x0A,         /* Reserved (16-bit) */

        IstartX         = 0x0C,         /* Image Start X (16-bit) */
        IstartY         = 0x0E,         /* Image Start Y (16-bit) */
        IendX           = 0x10,         /* Image End X (16-bit) */
        IendY           = 0x12,         /* Image End Y (16-bit) */

        RatioX          = 0x14,         /* Ratio X (16-bit) */
        RatioY          = 0x16,         /* Ratio Y (16-bit) */
        OffsetX         = 0x18,         /* Offset X (16-bit) */
        OffsetY         = 0x1A,         /* Offset Y (16-bit) */

        TestR           = 0x1C,         /* Red signature analysis register */
        TestG           = 0x1D,         /* Green signature analysis register */
        TestB           = 0x1E,         /* Blue signature analysis register */

        Nir             = 0x1F,         /* number of indirect registers */
};

static void
options(Vga*, Ctlr* ctlr)
{
        ctlr->flag |= Hpclk2x8|Foptions;
}

static void
init(Vga* vga, Ctlr* ctlr)
{
        ulong grade, pclk;
        char *p;

        /*
         * Part comes in -170, -135 and -110MHz speed-grades.
         * In 8-bit mode the max. PCLK is 135MHz for the -170 part
         * and the speed-grade for the others. In 2x8-bit mode, the max.
         * PCLK is the speed-grade, using the 2x doubler.
         * Work out the part speed-grade from name. Name can have,
         * e.g. '-135' on the end  for 135MHz part.
         */
        grade = 110000000;
        if(p = strrchr(ctlr->name, '-'))
                grade = strtoul(p+1, 0, 0) * 1000000;

        if(grade == 170000000)
                pclk = 135000000;
        else
                pclk = grade;

        /*
         * 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;

        /*
         * Determine whether to use 2x8-bit mode or not.
         * If yes and the clock has already been initialised,
         * initialise it again. There is no real frequency
         * restriction, it's really just a lower limit on what's
         * available in some clock generator chips.
         */
        if(vga->ctlr && (vga->ctlr->flag & Hpclk2x8) && vga->mode->z == 8 && vga->f[0] >= 60000000){
                vga->f[0] /= 2;
                resyncinit(vga, ctlr, Upclk2x8, 0);
        }
        if(vga->f[0] > pclk)
                error("%s: invalid pclk - %ld\n", ctlr->name, vga->f[0]);

        ctlr->flag |= Finit;
}

static void
load(Vga* vga, Ctlr* ctlr)
{
        uchar mode, x;

        /*
         * Put the chip to sleep.
         */
        attdaco(Cr0, 0x08);

        mode = 0x00;
        if(ctlr->flag & Upclk2x8)
                mode = 0x20;

        /*
         * Set the mode in the RAMDAC, setting 6/8-bit colour
         * as appropriate and waking the chip back up.
         */
        if(vga->mode->z == 8 && 0)
                mode |= 0x02;
        x = attdaci(Cr1) & 0x80;
        attdaco(Cr1, x);
        attdaco(Cr0, mode);

        ctlr->flag |= Fload;
}

static void
dump(Vga*, Ctlr* ctlr)
{
        int i;

        printitem(ctlr->name, "");
        for(i = 0; i < Nir; i++)
                printreg(attdaci(i));
}

Ctlr w30c516 = {
        "w30c516",                      /* name */
        0,                              /* snarf */
        options,                        /* options */
        init,                           /* init */
        load,                           /* load */
        dump,                           /* dump */
};