i2c.c

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/********************** BEGIN LICENSE BLOCK ************************************
 *
 * JZ4740  mobile_tv  Project  V1.0.0
 * INGENIC CONFIDENTIAL--NOT FOR DISTRIBUTION IN SOURCE CODE FORM
 * Copyright (c) Ingenic Semiconductor Co. Ltd 2005. All rights reserved.
 * 
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * http://www.ingenic.cn 
 *
 ********************** END LICENSE BLOCK **************************************
 *
 *  Author:  <[e-mail]>  <[e-mail]> 
 *
 *  Create:   2008-06-26, by dsqiu
 *            
 *  Maintain: 2008-06-26, by jgao
 *            
 *
 *******************************************************************************
 */

#include <jz4740.h>

//#define DEVCLK	3686400
#define DEVCLK		12000000

/* I2C protocol */
#define I2C_READ	1
#define I2C_WRITE	0

#define TIMEOUT         1000

/* error code */
#define ETIMEDOUT	1
#define ENODEV		2
#define EREMOTEIO	140


/* I2C protocol */
#define I2C_READ	1
#define I2C_WRITE	0

#define TIMEOUT         1000

/*
 * I2C bus protocol basic routines
 */
static int i2c_put_data(unsigned char data)
{
	unsigned int timeout = TIMEOUT*10;

	__i2c_write(data);
	__i2c_set_drf();
	while (__i2c_check_drf() != 0);
	while (!__i2c_transmit_ended());
	while (!__i2c_received_ack() && timeout)
		timeout--;
	if (timeout)
		return 0;
	else
		return -ETIMEDOUT;
}

//#ifdef CONFIG_JZ_TPANEL_ATA2508
static int i2c_put_data_nack(unsigned char data)
{
	unsigned int timeout = TIMEOUT*10;

	__i2c_write(data);
	__i2c_set_drf();
	while (__i2c_check_drf() != 0);
	while (!__i2c_transmit_ended());
	while (timeout--);
		return 0;
}
//#endif

static int i2c_get_data(unsigned char *data, int ack)
{
	int timeout = TIMEOUT*10;

	if (!ack)
		__i2c_send_nack();
	else
		__i2c_send_ack();

	while (__i2c_check_drf() == 0 && timeout)
		timeout--;

	if (timeout) {
		if (!ack)
			__i2c_send_stop();
		*data = __i2c_read();
		__i2c_clear_drf();
		return 0;
	} else
		return -ETIMEDOUT;
}

/*
 * I2C interface
 */
void i2c_open(void)
{
	__i2c_set_clk(DEVCLK, 10000); /* default 10 KHz */

	__i2c_enable();
}

void i2c_close(void)
{
	udelay(300); /* wait for STOP goes over. */
	__i2c_disable();
}

void i2c_setclk(unsigned int i2cclk)
{
	__i2c_set_clk(DEVCLK, i2cclk);
}

int i2c_lseek(unsigned char device, unsigned char offset)
{
	__i2c_send_nack();	/* Master does not send ACK, slave sends it */
	__i2c_send_start();
	if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
		goto device_err;
	if (i2c_put_data(offset) < 0)
		goto address_err;
	return 0;
 device_err:
	printf("No I2C device (0x%02x) installed.\n", device);
	__i2c_send_stop();
	return -ENODEV;
 address_err:
	printf("No I2C device (0x%02x) response.\n", device);
	__i2c_send_stop();
	return -EREMOTEIO;
}

int i2c_read(unsigned char device, unsigned char *buf,
	       unsigned char address, int count)
{
	int cnt = count;
	int timeout = 5;

L_try_again:

	if (timeout < 0)
		goto L_timeout;

	__i2c_send_nack();	/* Master does not send ACK, slave sends it */
	__i2c_send_start();
	if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
		goto device_werr;
	if (i2c_put_data(address) < 0)
		goto address_err;

	__i2c_send_start();
	if (i2c_put_data( (device << 1) | I2C_READ ) < 0)
		goto device_rerr;
	__i2c_send_ack();	/* Master sends ACK for continue reading */
	while (cnt) {
		if (cnt == 1) {
			if (i2c_get_data(buf, 0) < 0)
				break;
		} else {
			if (i2c_get_data(buf, 1) < 0)
				break;
		}
		cnt--;
		buf++;
	}

	__i2c_send_stop();
	return count - cnt;
 device_rerr:
 device_werr:
 address_err:
	timeout --;
	__i2c_send_stop();
	goto L_try_again;

L_timeout:
	__i2c_send_stop();
	printf("Read I2C device 0x%2x failed.\n", device);
	return -ENODEV;
}

int i2c_write(unsigned char device, unsigned char *buf,
		unsigned char address, int count)
{
	int cnt = count;
	int cnt_in_pg;
	int timeout = 5;
	unsigned char *tmpbuf;
	unsigned char tmpaddr;

	__i2c_send_nack();	/* Master does not send ACK, slave sends it */

 W_try_again:
	if (timeout < 0)
		goto W_timeout;

	cnt = count;
	tmpbuf = (unsigned char *)buf;
	tmpaddr = address;

 start_write_page:
	cnt_in_pg = 0;
	__i2c_send_start();
	if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
		goto device_err;
	if (i2c_put_data(tmpaddr) < 0)
		goto address_err;
	while (cnt) {
		if (++cnt_in_pg > 8) {
			__i2c_send_stop();
			mdelay(1);
			tmpaddr += 8;
			goto start_write_page;
		}
		if (i2c_put_data(*tmpbuf) < 0)
			break;
		cnt--;
		tmpbuf++;
	}

	__i2c_send_stop();
	return count - cnt;
 device_err:
 address_err:
	timeout--;
	__i2c_send_stop();
	goto W_try_again;

 W_timeout:
	printf("Write I2C device 0x%2x failed.\n", device);
	__i2c_send_stop();
	return -ENODEV;
}

int i2c_read_16(unsigned char device, unsigned char *buf,
	       unsigned short address, int count)
{
	int cnt = count;
	int timeout = 5;
	unsigned char tmpaddrh, tmpaddrl;

	tmpaddrh = (unsigned char)((address >> 8) & 0xff);
	tmpaddrl = (unsigned char)(address & 0xff);

L_try_again:

	if (timeout < 0)
		goto L_timeout;

	__i2c_send_nack();	/* Master does not send ACK, slave sends it */
	__i2c_send_start();
	if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
		goto device_werr;
	if (i2c_put_data_nack(tmpaddrh) < 0)
		goto address_err;
	if (i2c_put_data(tmpaddrl) < 0)
		goto address_err;

	__i2c_send_start();
	if (i2c_put_data( (device << 1) | I2C_READ ) < 0)
		goto device_rerr;
	__i2c_send_ack();	/* Master sends ACK for continue reading */
	while (cnt) {
		if (cnt == 1) {
			if (i2c_get_data(buf, 0) < 0)
				break;
		} else {
			if (i2c_get_data(buf, 1) < 0)
				break;
		}
		cnt--;
		buf++;
	}

	__i2c_send_stop();
	return count - cnt;
 device_rerr:
 device_werr:
 address_err:
	timeout --;
	__i2c_send_stop();
	goto L_try_again;

L_timeout:
	__i2c_send_stop();
	printf("Read I2C device 0x%2x failed.\n", device);
	return -ENODEV;
}

int i2c_write_16(unsigned char device, unsigned char *buf,
		unsigned short address, int count)
{
	int cnt = count;
	int cnt_in_pg;
	int timeout = 5;
	unsigned char *tmpbuf;
	unsigned char tmpaddrh, tmpaddrl;

	__i2c_send_nack();	/* Master does not send ACK, slave sends it */

 W_try_again:
	if (timeout < 0)
		goto W_timeout;

	cnt = count;
	tmpbuf = (unsigned char *)buf;
	tmpaddrh = (unsigned char)((address >> 8) & 0xff);
	tmpaddrl = (unsigned char)(address & 0xff);

 start_write_page:
	cnt_in_pg = 0;
	__i2c_send_start();
	if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
		goto device_err;
	if (i2c_put_data_nack(tmpaddrh) < 0)
		goto address_err;
	if (i2c_put_data(tmpaddrl) < 0)
		goto address_err;
	while (cnt) {
		if (++cnt_in_pg > 8) {
			__i2c_send_stop();
			mdelay(1);
			tmpaddrh += 8;
			goto start_write_page;
		}
		if (i2c_put_data(*tmpbuf) < 0)
			break;
		cnt--;
		tmpbuf++;
	}

	__i2c_send_stop();
	return count - cnt;
 device_err:
	printf("1:Write I2C device 0x%2x failed.\n", device);
 address_err:
	printf("2:Write I2C address 0x%2x failed.\n", address);
	timeout--;
	__i2c_send_stop();
	goto W_try_again;

 W_timeout:
	printf("3:Write I2C device 0x%2x failed.\n", device);
	__i2c_send_stop();
	return -ENODEV;
}