mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-28 20:58:06 +02:00
Remove i2c.
This commit is contained in:
Lars-Peter Clausen
Xiangfu Liu
parent
08996e7e50
commit
918f1072ed
@ -5,7 +5,7 @@
|
||||
# Object file lists.
|
||||
|
||||
obj-y += prom.o irq.o time.o reset.o setup.o dma.o \
|
||||
gpio.o clock.o platform.o i2c.o
|
||||
gpio.o clock.o platform.o
|
||||
|
||||
obj-$(CONFIG_PROC_FS) += proc.o
|
||||
|
||||
|
||||
@ -1,273 +0,0 @@
|
||||
/*
|
||||
* linux/arch/mips/jz4740/i2c.c
|
||||
*
|
||||
* Jz4740 I2C routines.
|
||||
*
|
||||
* Copyright (C) 2005,2006 Ingenic Semiconductor Inc.
|
||||
* Author: <lhhuang@ingenic.cn>
|
||||
*
|
||||
* This program is free software; you can distribute it and/or modify it
|
||||
* under the terms of the GNU General Public License (Version 2) as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
|
||||
*
|
||||
*/
|
||||
#include <linux/module.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/delay.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/addrspace.h>
|
||||
|
||||
#include <asm/jzsoc.h>
|
||||
|
||||
/* 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(jz_clocks.extalclk, 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(jz_clocks.extalclk, 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:
|
||||
printk(KERN_DEBUG "No I2C device (0x%02x) installed.\n", device);
|
||||
__i2c_send_stop();
|
||||
return -ENODEV;
|
||||
address_err:
|
||||
printk(KERN_DEBUG "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();
|
||||
printk("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;
|
||||
#ifdef CONFIG_JZ_TPANEL_ATA2508
|
||||
if (address == 0xff) {
|
||||
if (i2c_put_data_nack(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_nack(*tmpbuf) < 0)
|
||||
break;
|
||||
cnt--;
|
||||
tmpbuf++;
|
||||
}
|
||||
}
|
||||
else {
|
||||
|
||||
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++;
|
||||
}
|
||||
}
|
||||
#else
|
||||
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++;
|
||||
}
|
||||
#endif
|
||||
__i2c_send_stop();
|
||||
return count - cnt;
|
||||
device_err:
|
||||
address_err:
|
||||
timeout--;
|
||||
__i2c_send_stop();
|
||||
goto W_try_again;
|
||||
|
||||
W_timeout:
|
||||
printk(KERN_DEBUG "Write I2C device 0x%2x failed.\n", device);
|
||||
__i2c_send_stop();
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(i2c_open);
|
||||
EXPORT_SYMBOL(i2c_close);
|
||||
EXPORT_SYMBOL(i2c_setclk);
|
||||
EXPORT_SYMBOL(i2c_read);
|
||||
EXPORT_SYMBOL(i2c_write);
|
||||
Loading…
Reference in New Issue
Block a user