ref: a79465e118a0469bbda928f86b9eef6b42d18593
dir: /sys/src/cmd/aux/vga/w30c516.c/
#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 */
};