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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include "pci.h"
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#include "vga.h"
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/*
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* IC Works W30C516 ZOOMDAC.
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* DSP-based Multimedia RAMDAC.
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*/
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enum {
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Cr0 = 0x00, /* Control register 0 */
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Mid = 0x01, /* Manufacturer's identification register */
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Did = 0x02, /* Device identification register */
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Cr1 = 0x03, /* Control register 1 */
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Reserve1 = 0x04, /* Reserved (16-bit) */
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Reserve2 = 0x06, /* Reserved (16-bit) */
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Reserve3 = 0x08, /* Reserved (16-bit) */
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Reserve4 = 0x0A, /* Reserved (16-bit) */
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IstartX = 0x0C, /* Image Start X (16-bit) */
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IstartY = 0x0E, /* Image Start Y (16-bit) */
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IendX = 0x10, /* Image End X (16-bit) */
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IendY = 0x12, /* Image End Y (16-bit) */
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RatioX = 0x14, /* Ratio X (16-bit) */
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RatioY = 0x16, /* Ratio Y (16-bit) */
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OffsetX = 0x18, /* Offset X (16-bit) */
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OffsetY = 0x1A, /* Offset Y (16-bit) */
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TestR = 0x1C, /* Red signature analysis register */
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TestG = 0x1D, /* Green signature analysis register */
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TestB = 0x1E, /* Blue signature analysis register */
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Nir = 0x1F, /* number of indirect registers */
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};
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static void
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options(Vga*, Ctlr* ctlr)
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{
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ctlr->flag |= Hpclk2x8|Foptions;
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}
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static void
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init(Vga* vga, Ctlr* ctlr)
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{
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ulong grade, pclk;
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char *p;
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/*
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* Part comes in -170, -135 and -110MHz speed-grades.
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* In 8-bit mode the max. PCLK is 135MHz for the -170 part
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* and the speed-grade for the others. In 2x8-bit mode, the max.
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* PCLK is the speed-grade, using the 2x doubler.
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* Work out the part speed-grade from name. Name can have,
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* e.g. '-135' on the end for 135MHz part.
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*/
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grade = 110000000;
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if(p = strrchr(ctlr->name, '-'))
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grade = strtoul(p+1, 0, 0) * 1000000;
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if(grade == 170000000)
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pclk = 135000000;
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else
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pclk = grade;
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/*
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* If we don't already have a desired pclk,
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* take it from the mode.
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* Check it's within range.
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*/
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if(vga->f[0] == 0)
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vga->f[0] = vga->mode->frequency;
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/*
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* Determine whether to use 2x8-bit mode or not.
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* If yes and the clock has already been initialised,
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* initialise it again. There is no real frequency
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* restriction, it's really just a lower limit on what's
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* available in some clock generator chips.
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*/
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if(vga->ctlr && (vga->ctlr->flag & Hpclk2x8) && vga->mode->z == 8 && vga->f[0] >= 60000000){
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vga->f[0] /= 2;
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resyncinit(vga, ctlr, Upclk2x8, 0);
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}
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if(vga->f[0] > pclk)
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error("%s: invalid pclk - %ld\n", ctlr->name, vga->f[0]);
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ctlr->flag |= Finit;
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}
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static void
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load(Vga* vga, Ctlr* ctlr)
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{
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uchar mode, x;
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/*
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* Put the chip to sleep.
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*/
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attdaco(Cr0, 0x08);
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mode = 0x00;
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if(ctlr->flag & Upclk2x8)
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mode = 0x20;
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/*
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* Set the mode in the RAMDAC, setting 6/8-bit colour
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* as appropriate and waking the chip back up.
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*/
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if(vga->mode->z == 8 && 0)
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mode |= 0x02;
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x = attdaci(Cr1) & 0x80;
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attdaco(Cr1, x);
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attdaco(Cr0, mode);
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ctlr->flag |= Fload;
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}
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static void
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dump(Vga*, Ctlr* ctlr)
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{
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int i;
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printitem(ctlr->name, "");
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for(i = 0; i < Nir; i++)
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printreg(attdaci(i));
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}
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Ctlr w30c516 = {
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"w30c516", /* name */
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0, /* snarf */
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options, /* options */
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init, /* init */
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load, /* load */
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dump, /* dump */
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};
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