Subversion Repositories planix.SVN

#include <u.h>

#include <libc.h>

#include <bio.h>

#include "pci.h"

#include "vga.h"

/*

 * Clocks which require fiddling with the S3 registers

 * in order to be loaded.

 */

static void

setcrt42(Vga* vga, Ctlr* ctlr, uchar index)

{

	trace("%s->clock->setcrt42\n", ctlr->name);

	vgao(MiscW, vga->misc & ~0x0C);

	outportb(Crtx+1, 0x00);

	vga->crt[0x42] = (vga->crt[0x42] & 0xF0)|index;

	vgao(MiscW, vga->misc);

	vgaxo(Crtx, 0x42, vga->crt[0x42]);

}

static void

icd2061aload(Vga* vga, Ctlr* ctlr)

{

	ulong sdata;

	int i;

	uchar crt42;

	trace("%s->clock->icd2061aload\n", ctlr->name);

	/*

	 * The serial word to be loaded into the icd2061a is

	 *	(2<<21)|(vga->i<<17)|((vga->n)<<10)|(vga->p<<7)|vga->d

	 * Always select ICD2061A REG2.

	 */

	sdata = (2<<21)|(vga->i[0]<<17)|((vga->n[0])<<10)|(vga->p[0]<<7)|vga->d[0];

	/*

	 * The display should be already off to enable  us to clock the

	 * serial data word into either MiscW or Crt42.

	 *

	 * Set the Misc register to make clock-select-out the contents of

	 * register Crt42. Must turn the sequencer off when changing bits

	 * <3:2> of Misc. Also, must set Crt42 to 0 before setting <3:2>

	 * of Misc due to a hardware glitch.

	 */

	vgao(MiscW, vga->misc & ~0x0C);

	crt42 = vgaxi(Crtx, 0x42) & 0xF0;

	outportb(Crtx+1, 0x00);

	vgaxo(Seqx, 0x00, 0x00);

	vgao(MiscW, vga->misc|0x0C);

	vgaxo(Seqx, 0x00, 0x03);

	/*

	 * Unlock the ICD2061A. The unlock sequence is at least 5 low-to-high

	 * transitions of CLK with DATA high, followed by a single low-to-high

	 * transition of CLK with DATA low.

	 * Using Crt42, CLK is bit0, DATA is bit 1. If we used MiscW, they'd

	 * be bits 2 and 3 respectively.

	 */

	outportb(Crtx+1, crt42|0x00);			/* -DATA|-CLK */

	outportb(Crtx+1, crt42|0x02);			/* +DATA|-CLK */

	for(i = 0; i < 5; i++){

		outportb(Crtx+1, crt42|0x03);		/* +DATA|+CLK */

		outportb(Crtx+1, crt42|0x02);		/* +DATA|-CLK */

	}

	outportb(Crtx+1, crt42|0x00);			/* -DATA|-CLK */

	outportb(Crtx+1, crt42|0x01);			/* -DATA|+CLK */

	/*

	 * Now write the serial data word, framed by a start-bit and a stop-bit.

	 * The data is written using a modified Manchester encoding such that a

	 * data-bit is sampled on the rising edge of CLK and the complement of

	 * the data-bit is sampled on the previous falling edge of CLK.

	 */

	outportb(Crtx+1, crt42|0x00);			/* -DATA|-CLK (start-bit) */

	outportb(Crtx+1, crt42|0x01);			/* -DATA|+CLK */

	for(i = 0; i < 24; i++){			/* serial data word */

		if(sdata & 0x01){

			outportb(Crtx+1, crt42|0x01);	/* -DATA|+CLK */

			outportb(Crtx+1, crt42|0x00);	/* -DATA|-CLK (falling edge) */

			outportb(Crtx+1, crt42|0x02);	/* +DATA|-CLK */

			outportb(Crtx+1, crt42|0x03);	/* +DATA|+CLK (rising edge) */

		}

		else {

			outportb(Crtx+1, crt42|0x03);	/* +DATA|+CLK */

			outportb(Crtx+1, crt42|0x02);	/* +DATA|-CLK (falling edge) */

			outportb(Crtx+1, crt42|0x00);	/* -DATA|-CLK */

			outportb(Crtx+1, crt42|0x01);	/* -DATA|+CLK (rising edge) */

		}

		sdata >>= 1;

	}

	outportb(Crtx+1, crt42|0x03);			/* +DATA|+CLK (stop-bit) */

	outportb(Crtx+1, crt42|0x02);			/* +DATA|-CLK */

	outportb(Crtx+1, crt42|0x03);			/* +DATA|+CLK */

	/*

	 * We always use REG2 in the ICD2061A.

	 */

	setcrt42(vga, ctlr, 0x02);

}

static void

ch9294load(Vga* vga, Ctlr* ctlr)

{

	trace("%s->clock->ch9294load\n", ctlr->name);

	setcrt42(vga, ctlr, vga->i[0]);

}

static void

tvp3025load(Vga* vga, Ctlr* ctlr)

{

	uchar crt5c, x;

	trace("%s->clock->tvp3025load\n", ctlr->name);

	/*

	 * Crt5C bit 5 is RS4.

	 * Clear it to select TVP3025 registers for

	 * the calls to tvp302xo().

	 */

	crt5c = vgaxi(Crtx, 0x5C);

	vgaxo(Crtx, 0x5C, crt5c & ~0x20);

	tvp3020xo(0x2C, 0x00);

	tvp3020xo(0x2D, vga->d[0]);

	tvp3020xo(0x2D, vga->n[0]);

	tvp3020xo(0x2D, 0x08|vga->p[0]);

	tvp3020xo(0x2F, 0x01);

	tvp3020xo(0x2F, 0x01);

	tvp3020xo(0x2F, vga->p[0]);

	x = 0x54;

	if(vga->ctlr && (vga->ctlr->flag & Uenhanced))

		x = 0xC4;

	tvp3020xo(0x1E, x);

	vgaxo(Crtx, 0x5C, crt5c);

	vgao(MiscW, vga->misc);

	ctlr->flag |= Fload;

}

static void

tvp3026load(Vga* vga, Ctlr* ctlr)

{

	trace("%s->clock->tvp3026load\n", ctlr->name);

	if((vga->misc & 0x0C) != 0x0C && vga->mode->z == 1){

		tvp3026xo(0x1A, 0x07);

		tvp3026xo(0x18, 0x80);

		tvp3026xo(0x19, 0x98);

		tvp3026xo(0x2C, 0x2A);

		tvp3026xo(0x2F, 0x00);

		tvp3026xo(0x2D, 0x00);

		tvp3026xo(0x39, 0x18);

		setcrt42(vga, ctlr, 0);

	}

	else if(vga->mode->z == 8){

		tvp3026xo(0x1A, 0x05);

		tvp3026xo(0x18, 0x80);

		tvp3026xo(0x19, 0x4C);

		tvp3026xo(0x2C, 0x2A);

		tvp3026xo(0x2F, 0x00);

		tvp3026xo(0x2D, 0x00);

		tvp3026xo(0x2C, 0x00);

		tvp3026xo(0x2D, 0xC0|vga->n[0]);

		tvp3026xo(0x2D, vga->m[0] & 0x3F);

		tvp3026xo(0x2D, 0xB0|vga->p[0]);

		while(!(tvp3026xi(0x2D) & 0x40))

			;

		tvp3026xo(0x39, 0x38|vga->q[1]);

		tvp3026xo(0x2C, 0x00);

		tvp3026xo(0x2F, 0xC0|vga->n[1]);

		tvp3026xo(0x2F, vga->m[1]);

		tvp3026xo(0x2F, 0xF0|vga->p[1]);

		while(!(tvp3026xi(0x2F) & 0x40))

			;

		setcrt42(vga, ctlr, 3);

	}

	ctlr->flag |= Fload;

}

static struct {

	char*	name;

	void	(*load)(Vga*, Ctlr*);

} clocks[] = {

	{ "icd2061a",		icd2061aload, },

	{ "ch9294",		ch9294load, },

	{ "tvp3025clock",	tvp3025load, },

	{ "tvp3026clock",	tvp3026load, },

	{ 0 },

};

static void

init(Vga* vga, Ctlr* ctlr)

{

	char name[Namelen+1], *p;

	int i;

	if(vga->clock == 0)

		return;

	/*

	 * Check we know about it.

	 */

	strncpy(name, vga->clock->name, Namelen);

	name[Namelen] = 0;

	if(p = strchr(name, '-'))

		*p = 0;

	for(i = 0; clocks[i].name; i++){

		if(strcmp(clocks[i].name, name) == 0)

			break;

	}

	if(clocks[i].name == 0)

		error("%s: unknown clock \"%s\"\n", ctlr->name, vga->clock->name);

	if(vga->clock->init && (vga->clock->flag & Finit) == 0)

		(*vga->clock->init)(vga, vga->clock);

	/*

	 * If we don't already have a desired pclk,

	 * take it from the mode.

	 */

	if(vga->f[0] == 0)

		vga->f[0] = vga->mode->frequency;

	if(vga->f[0] != VgaFreq0 && vga->f[0] != VgaFreq1)

		vga->misc |= 0x0C;

	ctlr->flag |= Finit;

}

static void

load(Vga* vga, Ctlr* ctlr)

{

	char name[Namelen+1], *p;

	int i;

	if(vga->clock == 0 || (vga->clock->flag & Fload))

		return;

	strncpy(name, vga->clock->name, Namelen);

	name[Namelen] = 0;

	if(p = strchr(name, '-'))

		*p = 0;

	for(i = 0; clocks[i].name; i++){

		if(strcmp(clocks[i].name, name))

			continue;

		clocks[i].load(vga, ctlr);

		if(strcmp(clocks[i].name, "icd2061a") == 0){

			clocks[i].load(vga, ctlr);

			clocks[i].load(vga, ctlr);

		}

		ctlr->flag |= Fload;

		return;

	}

}

Ctlr s3clock = {

	"s3clock",			/* name */

	0,				/* snarf */

	0,				/* options */

	init,				/* init */

	load,				/* load */

	0,				/* dump */

};