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/******************************************************************************
**
** Copyright (c) Newport Media Inc. All rights reserved.
**
** Module Name: nmidrv_i2c.c
**
** This module implements the i2c interface NMI ATV/DTV
**
**
*******************************************************************************/
#include "nmidrv_i2c.h"
#include "nmidrv_kernel.h"
#include "nmidrv_custom_mtk.h"
#ifndef NMI_HW_I2C
#include "mach/mt6516_gpio.h"
#include <linux/delay.h>
/******************************************************************************
**
** I2c Defines
**
*******************************************************************************/
#undef _DRIVE_ //this mode is nmi600 Recommend mode. please don't change it.
#define I2C_DELAY_UNIT 2
#define set_sda_output() NMI_SET_GPIO_DIR(NMI_SDA_PIN,1); \
NMI_SET_GPIO_LEVEL(NMI_SDA_PIN,0)
#define set_sda_input() NMI_SET_GPIO_DIR(NMI_SDA_PIN,0)
#define set_scl_output() NMI_SET_GPIO_DIR(NMI_SCL_PIN,1); \
NMI_SET_GPIO_LEVEL(NMI_SCL_PIN,0)
#define set_scl_input() NMI_SET_GPIO_DIR(NMI_SCL_PIN,0)
#ifdef _DRIVE_
#define set_i2c_scl_PIN NMI_SET_GPIO_LEVEL(NMI_SCL_PIN,1)
#define clr_i2c_scl_PIN NMI_SET_GPIO_LEVEL(NMI_SCL_PIN,0)
#define set_i2c_sda_PIN NMI_SET_GPIO_LEVEL(NMI_SDA_PIN,1)
#define clr_i2c_sda_PIN NMI_SET_GPIO_LEVEL(NMI_SDA_PIN,0)
#else
#define set_i2c_scl_PIN NMI_SET_GPIO_LEVEL(NMI_SCL_PIN,1)
#define clr_i2c_scl_PIN NMI_SET_GPIO_LEVEL(NMI_SCL_PIN,0)
#define set_i2c_sda_PIN NMI_SET_GPIO_DIR(NMI_SDA_PIN,0)
#define clr_i2c_sda_PIN NMI_SET_GPIO_DIR(NMI_SDA_PIN,1)
#endif
#define get_i2c_sda_PIN NMI_GET_GPIO_LEVEL(NMI_SDA_PIN)
#define get_i2c_scl_PIN NMI_GET_GPIO_LEVEL(NMI_SCL_PIN)
/******************************************************************************
**
** I2c Platform Functions
**
*******************************************************************************/
static void i2c_delay(unsigned int time)
{
#if 0
while(time--) {
;
}
#else
udelay(time);
#endif
}
static void i2c_begin(void)
{
#ifdef _DRIVE_
/* set SDA to high */
set_i2c_sda_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL to high */
set_i2c_scl_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SDA to low */
clr_i2c_sda_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL to low */
clr_i2c_scl_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
#else
/* set SDA to high */
set_sda_input();
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL to high */
set_scl_input();
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SDA to low */
set_sda_output();
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL to low */
set_scl_output();
i2c_delay(I2C_DELAY_UNIT << 0);
#endif
}
static void i2c_end(void)
{
#ifdef _DRIVE_
/* set SDA to low */
clr_i2c_sda_PIN;
i2c_delay(I2C_DELAY_UNIT << 2);
/* set SCL to high */
set_i2c_scl_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SDA to high */
set_i2c_sda_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
#else
set_sda_output();
i2c_delay(I2C_DELAY_UNIT << 2);
set_scl_input();
i2c_delay(I2C_DELAY_UNIT << 3);
set_sda_input();
i2c_delay(I2C_DELAY_UNIT << 4);
#endif
}
static void i2c_write_ask(unsigned char flag)
{
#ifdef _DRIVE_
/* set SDA to high to ack */
if(flag)
set_i2c_sda_PIN;
else
clr_i2c_sda_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* toggle clock */
set_i2c_scl_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
clr_i2c_scl_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SDA to 1 */
set_i2c_sda_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
#else
//set_sda_output();
if(flag)
set_sda_input();
//else
//set_sda_output();
i2c_delay(I2C_DELAY_UNIT << 0);
set_scl_input();
i2c_delay(I2C_DELAY_UNIT << 0);
set_scl_output();
i2c_delay(I2C_DELAY_UNIT << 0);
set_sda_input();
i2c_delay(I2C_DELAY_UNIT << 0);
#endif
}
static unsigned char i2c_read_ack(void)
{
unsigned char ret;
#ifdef _DRIVE_
/* set SDA to input */
set_sda_input();
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
/* read */
if (!get_i2c_sda_PIN) {
ret = 1;
} else {
ret = 0;
dPrint(N_ERR,"[MTKI2C] 1. i2c_read_ack (Error.. No Ack received)\n");
i2c_delay(I2C_DELAY_UNIT << 0);
if (!get_i2c_sda_PIN) {
ret = 1;
dPrint(N_ERR,"[MTKI2C] 2.i2c_read_ack (Correct after additional delay.)\n");
} else {
ret = 0;
dPrint(N_ERR,"[MTKI2C] 2.i2c_read_ack (Error.. No Ack received)\n");
}
}
/* set SCL high */
set_i2c_scl_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL low */
clr_i2c_scl_PIN;
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SDA back to output */
set_sda_output();
#else
set_sda_input();
i2c_delay(I2C_DELAY_UNIT << 0);
if (!get_i2c_sda_PIN) {
ret = 1;
} else {
ret = 0;
dPrint(N_ERR,"[MTKI2C] 1. i2c_read_ack (Error.. No Ack received)\n");
i2c_delay(I2C_DELAY_UNIT << 0);
if (!get_i2c_sda_PIN) {
ret = 1;
dPrint(N_ERR,"[MTKI2C] 2.i2c_read_ack (Correct after additional delay.)\n");
} else {
ret = 0;
dPrint(N_ERR,"[MTKI2C] 2.i2c_read_ack (Error.. No Ack received)\n");
}
}
set_scl_input();
i2c_delay(I2C_DELAY_UNIT << 0);
set_scl_output();
i2c_delay(I2C_DELAY_UNIT << 0);
#endif
return ret;
}
static unsigned char i2c_read_byte(void)
{
unsigned char i;
unsigned char ret = 0;
#ifdef _DRIVE_
/* set SDA input */
set_sda_input();
/* loop */
for (i = 0; i < 8; i++) {
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL high */
set_i2c_scl_PIN;
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
/* read SDA */
ret = ret<<1;
if (get_i2c_sda_PIN)
ret |= 1;
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL low */
clr_i2c_scl_PIN;
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
/* if end, set SDA output */
if (i == 7) {
set_sda_output();
}
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
}
#else
int retry,retry_val = 10000000;
ret = 0;
set_sda_input();
for (i = 0; i < 8; i++) {
i2c_delay(I2C_DELAY_UNIT << 0);
set_scl_input();
i2c_delay(I2C_DELAY_UNIT << 0);
ret = ret<<1;
if (get_i2c_sda_PIN)
ret |= 1;
i2c_delay(I2C_DELAY_UNIT << 0);
retry = retry_val;
while (retry >= 0)
{
if (get_i2c_scl_PIN)
break;
else
{
i2c_delay(I2C_DELAY_UNIT << 0);
retry--;
}
}
//if (retry != retry_val)
if (retry < (retry_val-10000))
{
//NMI_ERROR("[MTKI2C] i2c_read_byte: retry = %d\n",retry);
}
set_scl_output();
i2c_delay(I2C_DELAY_UNIT << 0);
if (i==7){
set_sda_output();
}
i2c_delay(I2C_DELAY_UNIT << 0);
}
#endif
return ret;
}
static unsigned char i2c_write_byte(unsigned char data)
{
unsigned char i;
#ifdef _DRIVE_
/* loop */
for (i = 0; i < 8; i++) {
/* set SDA high or low depend on the data bit */
if (data & 0x80)
set_i2c_sda_PIN;
else
clr_i2c_sda_PIN;
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
data <<= 1;
/* set SCL high */
set_i2c_scl_PIN;
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
/* set SCL low */
clr_i2c_scl_PIN;
/* delay */
i2c_delay(I2C_DELAY_UNIT << 0);
}
#else
int retry, retry_val = 10000000;
//set_sda_output();
for (i = 0; i < 8; i++) {
if (data & 0x80)
set_sda_input();
else
set_sda_output();
data <<= 1;
i2c_delay(I2C_DELAY_UNIT << 0);
set_scl_input();
i2c_delay(I2C_DELAY_UNIT << 0);
retry = retry_val;
while (retry >= 0)
{
if (get_i2c_scl_PIN)
break;
else
{
i2c_delay(I2C_DELAY_UNIT << 0);
retry--;
}
}
//if (retry != retry_val)
if (retry < (retry_val-10000))
{
dPrint(N_TRACE,"i2c write_byte: retry = %d\n",retry);
}
set_scl_output();
i2c_delay(I2C_DELAY_UNIT << 0);
}
#endif
return i2c_read_ack();
}
/******************************************************************************
**
** I2c Global Functions
**
*******************************************************************************/
int nmi_i2c_init(void)
{
dPrint(N_TRACE,"nmi_i2c_init: enter...\n");
//disable all inside pull( pullup & pulldown)
NMI_SET_GPIO_PULL_DISABLE(NMI_SDA_PIN);
NMI_SET_GPIO_PULL_DISABLE(NMI_SCL_PIN);
//set gpio mode
NMI_SET_GPIO_MODE_ENABLE(NMI_SDA_PIN);
NMI_SET_GPIO_MODE_ENABLE(NMI_SCL_PIN);
#ifdef _DRIVE_
//set output mode
NMI_SET_GPIO_DIR( NMI_SDA_PIN,1);
NMI_SET_GPIO_DIR( NMI_SCL_PIN,1);
//set gpio high
NMI_SET_GPIO_LEVEL( NMI_SDA_PIN,1);
NMI_SET_GPIO_LEVEL( NMI_SCL_PIN,1);
#else
//set input mode
NMI_SET_GPIO_DIR( NMI_SDA_PIN,0);
NMI_SET_GPIO_DIR( NMI_SCL_PIN,0);
#endif
dPrint(N_TRACE,"nmi_i2c_init: exit...\n");
return 1;
}
void nmi_i2c_deinit(void)
{
dPrint(N_TRACE,"nmi_i2c_deinit: enter...\n");
NMI_SET_GPIO_MODE_ENABLE(NMI_SDA_PIN);
NMI_SET_GPIO_MODE_ENABLE(NMI_SCL_PIN);
//set as input
NMI_SET_GPIO_DIR( NMI_SDA_PIN,0);
NMI_SET_GPIO_DIR( NMI_SCL_PIN,0);
dPrint(N_TRACE,"nmi_i2c_deinit: exit...\n");
}
int nmi_i2c_read(unsigned char adr, unsigned char *b, unsigned long sz)
{
int i;
i2c_begin();
i2c_write_byte((adr << 1)|0x1);
for(i = 0; i < sz; i++) {
b[i] = i2c_read_byte();
if(i == sz-1)
i2c_write_ask(1);
else
i2c_write_ask(0);
}
i2c_end();
return 1;
}
int nmi_i2c_write(unsigned char adr, unsigned char *b, unsigned long sz)
{
int i;
i2c_begin();
i2c_write_byte((adr << 1));
for(i = 0; i < sz; i++) {
i2c_write_byte(b[i]);
}
i2c_end();
return 1;
}
#endif
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