/* Copyright 1997, ESS Technology, Inc.					*//* SCCSID @(#)i2ccntl.c	1.15 11/11/97 */#include <stdio.h>#include "mvd.h"#include "common.h"#include "util.h"#include "ioport.h"#ifdef IIC/* This code is only used to initialize Brooktree *//************************************************************************ * Local defines.							* ************************************************************************/#ifdef BROWSER1#define	I2cRaiseClock 	TRISTATE_AUX3	/* Raise the SCL 	*/
#define	I2cDropClock 	CLEAR_AUX3	/* Drop the SCL 	*/#define	I2cRaiseData 	TRISTATE_AUX2	/* Raise the SCL 	*/#define	I2cDropData	CLEAR_AUX2	/* Drop the SDL		*/#define	I2cClockHigh	AUX3_HIGH	/* Is SCL high?		*/#define	I2cDataHigh	AUX2_HIGH	/* Is SDL high?		*/#define	I2cDataLow	AUX2_LOW	/* Is SDL low?		*/#else/* MVD board */#define	I2cRaiseClock 	SET_AUX1	/* Raise the SCL 	*/#define	I2cDropClock 	CLEAR_AUX1	/* Drop the SCL 	*/#define	I2cRaiseData	SET_AUX0	/* Raise the SDL	*/#define	I2cDropData	CLEAR_AUX0	/* Drop the SDL		*/#define	I2cClockHigh	AUX1_HIGH	/* Is SCL high?		*/#define	I2cDataHigh	AUX0_HIGH	/* Is SDL high?		*/#define	I2cDataLow	AUX0_LOW	/* Is SDL low?		*/#endif#define set_I2ctimer	do {} while(0)	/* now timer check is pending */#define check_I2ctimer  do {} while(0)	/* now timer check is pending *//******************** IIC Bus spec(normal-mode)*********************/#define tBUF 	(4700L)	/*4.7us*/#define tLOW	(4700L)	/*4.7us*/#define tHIGH	(4000L)	/*4.0us*/#define tSU_STA	(4700L)	/*4.7us*/#define tHD_STA	(4000L)	/*4.0us*/#define tSU_DAT	(0250L)	/*250ns*/#define tHD_DAT	(0000L)	/*0.0us*/#define tSU_STO	(4700L)	/*4.7us*//************************************************************************ * Functions used in this module only					* ************************************************************************/PRIVATE	void	wait_timer(int);PRIVATE	void	I2cRaiseClockWait(void);PRIVATE	void	I2cReadArray(unsigned char, int, unsigned char *);PRIVATE	int	I2cReadByte(void);PRIVATE	unsigned char	I2cReadStatus(unsigned char);PRIVATE	void	I2cWrite(int, int, int);PRIVATE	void	I2cWriteArray(unsigned char, int, unsigned char *);PRIVATE	void	I2cWriteByte(unsigned char);PRIVATE	void	Start_condition();PRIVATE	void	Stop_condition();PRIVATE void Start_condition(){    I2cRaiseClockWait();    wait_timer(tSU_STA);    I2cDropData;    wait_timer(tHD_STA);    I2cDropClock;}PRIVATE void Stop_condition(){    I2cRaiseClock;    wait_timer(tSU_STO);    I2cRaiseData;}/* time (nsec order) Max 2msec */PRIVATE void wait_timer(int wait_time)	{    int count;    int starttime, tmp;#if 1    if (wait_time == 0) return;    count = wait_time  * 80 /1000;   /* at 80Mhz*/    starttime = mvd[riface_timer2];    while (1){	tmp = mvd[riface_timer2] - starttime;	if (tmp < 0)	    tmp += -timer2_period;	if(tmp  >= count) break;    }#else    printf("temp skip timer\n");#endif}PRIVATE void I2cRaiseClockWait(void){    I2cRaiseClock;				/* raise the clock */    set_I2ctimer;    while (1) {	/* If no one is on bus, then return */	if (I2cClockHigh) return;	check_I2ctimer;    }}/*** Write a byte to the Phillips IIC,***/PRIVATE void I2cWriteByte(unsigned char c){    int i;    /* Send each bit across the data port */    for (i = 0; i < 8; i++) {	wait_timer(tLOW);	if (c & 0x80) {	/*drive SDL */	    I2cRaiseData;	} else {	    I2cDropData;	}	wait_timer(tSU_DAT);	/*wait data setup time */	I2cRaiseClockWait();	wait_timer(tHIGH);		/* keep SCL high */	I2cDropClock;	wait_timer(tHD_DAT);	/* keep SDL in data hold time */	c <<= 1;    }        /* get acknowledge */    wait_timer(tLOW);    I2cRaiseData;				/* raise the data */    I2cRaiseClockWait();    set_I2ctimer;    while (1) {	if (I2cDataLow) break;		/* Got ack */	check_I2ctimer;    }    wait_timer(tHIGH);    I2cDropClock;}/*** Read a byte from the Philips IIC,
***/PRIVATE int I2cReadByte(void){    int i, b;    /* read 8 bits */    b = 0;    for (i = 0; i < 8; i++) {	b <<= 1;	wait_timer(tLOW);	I2cRaiseClockWait();	b |= (I2cDataHigh ? 1 : 0);	wait_timer(tHIGH);	I2cDropClock;    }    /* send acknowledge */    wait_timer(tLOW);    I2cRaiseClockWait();   		    wait_timer(tHIGH);    I2cDropClock;   		    /* read 8 bits */      return(b);}/*** read an array of bytes from the Phillips IIC**** parms:	a	IIC address**		n	# bytes to read**		s	pointer to the array*/PRIVATE void I2cReadArray(unsigned char a, int n, unsigned char *s){    int j;    wait_timer(tBUF);    Start_condition();      /* Clock out the address */    I2cWriteByte(a);        /* Now read in the bytes */    for (j = 0; j < n; j++) {	s[j] = I2cReadByte();    }        Stop_condition();}/*** write an array of bytes to the Phillips IIC**** parms:	a	IIC address**		n	# bytes to write**		s	pointer to the array*/PRIVATE void I2cWriteArray(unsigned char a, int n, unsigned char *s){    int j;      wait_timer(tBUF);    Start_condition();        /* Clock out the address */    I2cWriteByte(a);        /* Now write out the bytes */    for (j = 0; j < n; j++) {	I2cWriteByte(s[j]);    }        Stop_condition();}/*** Read the Status of the Phillips IIC Bus*/PRIVATE unsigned char I2cReadStatus(unsigned char a){    unsigned char *pByte;    I2cReadArray(a, 1, pByte);    return(*pByte);}#if 0PRIVATE unsigned char command_7151[20] = { 	/* 7151 */    0x00,    /* sub-address */    0x2a,    /* 00  delay time */    0x42,    /* 01  hsync begin */    0x15,    /* 02  hsync stop */    0xfb,    /* 03  hor clamp begin */    0xcb,    /* 04  hor clamp stop */    0x3e,    /* 05  horiz sync start */    0x00,    /* 06  cvbs, 4.1mhz, bndfilt active, coring off, aper=0*/    0x00,    /* 07  hue control */    0xac,    /* 08  ntsc-m 60hz, colorkill */    0x30,    /* 09  uv off disabled, agc = medium, */    0x7f,    /* 0A */    0x7f,    /* 0B */    0xa4,    /* 0C  b7 */    0x48,    /* 0D  */    0x30,    /* 0E */    0x91,    /* (51)(91) 0F */    0xf0,    /* 60 10  */    0xff,    /* 21 11 72 */    0xc3	/* 12 */};#endif#define BT856		0x88#define BT856Ack	0x89#ifdef BT865#define BT865ADDR	0x8a#endifPRIVATE unsigned char command_856[]={    0xdc,    0x08,    /*0xde*/  0x00};int InitIIC(){#ifdef BT866    mvd[vid_scn_outputcntl] = 0x8000;#endif#ifdef BT865    int i;    mvd[vid_scn_outputcntl] = 0x0800;    for(i=0; i < 10000; i++);    	/* wait for a while */#endif    I2cRaiseClock;    I2cRaiseData;#ifdef BT865    I2cWrite(BT865ADDR,0xa6,0x80);    I2cWrite(BT865ADDR,0xca,0x80);    I2cWrite(BT865ADDR,0xce,0x02);#endif#ifdef BT866    I2cWrite(BT856,0xc8,0xcc);    I2cWrite(BT856,0xca,0x91);    I2cWrite(BT856,0xcc,0x20);    I2cWrite(BT856,0xdc,0x40);    I2cWrite(BT856,0xde,0x02);#endif#ifndef BT866#ifndef BT865    I2cWrite(BT856,0xdc,0x08);    I2cWrite(BT856,0xde,0x00);#endif#endif    return(0);}PRIVATE void I2cWrite(int device_address, int sub_address, int data){     unsigned char buf[2];    buf[0] = 0xff & sub_address;    buf[1] = 0xff & data;    I2cWriteArray(device_address, 2, buf);}void video_encoder_off(){#ifdef BT865    I2cWrite( 0x8a,0xbc,0x08 );#endif}#endif /* ifdef IIC */