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synced 2024-11-25 04:50:39 +02:00
Remove i2c.
This commit is contained in:
Lars-Peter Clausen
Xiangfu Liu
parent
08996e7e50
commit
918f1072ed
@ -5,7 +5,7 @@
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# Object file lists.
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obj-y += prom.o irq.o time.o reset.o setup.o dma.o \
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gpio.o clock.o platform.o i2c.o
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gpio.o clock.o platform.o
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obj-$(CONFIG_PROC_FS) += proc.o
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@ -1,273 +0,0 @@
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/*
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* linux/arch/mips/jz4740/i2c.c
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*
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* Jz4740 I2C routines.
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*
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* Copyright (C) 2005,2006 Ingenic Semiconductor Inc.
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* Author: <lhhuang@ingenic.cn>
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#include <asm/addrspace.h>
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#include <asm/jzsoc.h>
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/* I2C protocol */
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#define I2C_READ 1
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#define I2C_WRITE 0
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#define TIMEOUT 1000
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/*
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* I2C bus protocol basic routines
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*/
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static int i2c_put_data(unsigned char data)
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{
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unsigned int timeout = TIMEOUT*10;
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__i2c_write(data);
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__i2c_set_drf();
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while (__i2c_check_drf() != 0);
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while (!__i2c_transmit_ended());
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while (!__i2c_received_ack() && timeout)
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timeout--;
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if (timeout)
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return 0;
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else
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return -ETIMEDOUT;
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}
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#ifdef CONFIG_JZ_TPANEL_ATA2508
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static int i2c_put_data_nack(unsigned char data)
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{
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unsigned int timeout = TIMEOUT*10;
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__i2c_write(data);
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__i2c_set_drf();
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while (__i2c_check_drf() != 0);
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while (!__i2c_transmit_ended());
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while (timeout--);
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return 0;
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}
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#endif
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static int i2c_get_data(unsigned char *data, int ack)
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{
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int timeout = TIMEOUT*10;
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if (!ack)
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__i2c_send_nack();
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else
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__i2c_send_ack();
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while (__i2c_check_drf() == 0 && timeout)
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timeout--;
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if (timeout) {
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if (!ack)
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__i2c_send_stop();
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*data = __i2c_read();
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__i2c_clear_drf();
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return 0;
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} else
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return -ETIMEDOUT;
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}
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/*
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* I2C interface
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*/
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void i2c_open(void)
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{
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__i2c_set_clk(jz_clocks.extalclk, 10000); /* default 10 KHz */
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__i2c_enable();
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}
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void i2c_close(void)
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{
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udelay(300); /* wait for STOP goes over. */
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__i2c_disable();
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}
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void i2c_setclk(unsigned int i2cclk)
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{
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__i2c_set_clk(jz_clocks.extalclk, i2cclk);
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}
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int i2c_lseek(unsigned char device, unsigned char offset)
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{
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__i2c_send_nack(); /* Master does not send ACK, slave sends it */
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__i2c_send_start();
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if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
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goto device_err;
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if (i2c_put_data(offset) < 0)
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goto address_err;
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return 0;
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device_err:
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printk(KERN_DEBUG "No I2C device (0x%02x) installed.\n", device);
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__i2c_send_stop();
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return -ENODEV;
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address_err:
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printk(KERN_DEBUG "No I2C device (0x%02x) response.\n", device);
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__i2c_send_stop();
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return -EREMOTEIO;
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}
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int i2c_read(unsigned char device, unsigned char *buf,
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unsigned char address, int count)
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{
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int cnt = count;
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int timeout = 5;
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L_try_again:
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if (timeout < 0)
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goto L_timeout;
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__i2c_send_nack(); /* Master does not send ACK, slave sends it */
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__i2c_send_start();
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if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
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goto device_werr;
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if (i2c_put_data(address) < 0)
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goto address_err;
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__i2c_send_start();
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if (i2c_put_data( (device << 1) | I2C_READ ) < 0)
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goto device_rerr;
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__i2c_send_ack(); /* Master sends ACK for continue reading */
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while (cnt) {
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if (cnt == 1) {
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if (i2c_get_data(buf, 0) < 0)
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break;
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} else {
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if (i2c_get_data(buf, 1) < 0)
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break;
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}
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cnt--;
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buf++;
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}
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__i2c_send_stop();
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return count - cnt;
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device_rerr:
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device_werr:
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address_err:
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timeout --;
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__i2c_send_stop();
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goto L_try_again;
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L_timeout:
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__i2c_send_stop();
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printk("Read I2C device 0x%2x failed.\n", device);
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return -ENODEV;
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}
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int i2c_write(unsigned char device, unsigned char *buf,
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unsigned char address, int count)
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{
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int cnt = count;
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int cnt_in_pg;
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int timeout = 5;
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unsigned char *tmpbuf;
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unsigned char tmpaddr;
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__i2c_send_nack(); /* Master does not send ACK, slave sends it */
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W_try_again:
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if (timeout < 0)
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goto W_timeout;
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cnt = count;
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tmpbuf = (unsigned char *)buf;
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tmpaddr = address;
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start_write_page:
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cnt_in_pg = 0;
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__i2c_send_start();
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if (i2c_put_data( (device << 1) | I2C_WRITE ) < 0)
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goto device_err;
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#ifdef CONFIG_JZ_TPANEL_ATA2508
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if (address == 0xff) {
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if (i2c_put_data_nack(tmpaddr) < 0)
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goto address_err;
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while (cnt) {
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if (++cnt_in_pg > 8) {
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__i2c_send_stop();
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mdelay(1);
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tmpaddr += 8;
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goto start_write_page;
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}
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if (i2c_put_data_nack(*tmpbuf) < 0)
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break;
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cnt--;
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tmpbuf++;
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}
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}
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else {
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if (i2c_put_data(tmpaddr) < 0)
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goto address_err;
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while (cnt) {
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if (++cnt_in_pg > 8) {
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__i2c_send_stop();
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mdelay(1);
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tmpaddr += 8;
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goto start_write_page;
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}
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if (i2c_put_data(*tmpbuf) < 0)
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break;
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cnt--;
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tmpbuf++;
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}
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}
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#else
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if (i2c_put_data(tmpaddr) < 0)
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goto address_err;
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while (cnt) {
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if (++cnt_in_pg > 8) {
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__i2c_send_stop();
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mdelay(1);
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tmpaddr += 8;
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goto start_write_page;
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}
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if (i2c_put_data(*tmpbuf) < 0)
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break;
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cnt--;
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tmpbuf++;
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}
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#endif
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__i2c_send_stop();
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return count - cnt;
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device_err:
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address_err:
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timeout--;
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__i2c_send_stop();
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goto W_try_again;
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W_timeout:
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printk(KERN_DEBUG "Write I2C device 0x%2x failed.\n", device);
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__i2c_send_stop();
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return -ENODEV;
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}
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EXPORT_SYMBOL(i2c_open);
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EXPORT_SYMBOL(i2c_close);
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EXPORT_SYMBOL(i2c_setclk);
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EXPORT_SYMBOL(i2c_read);
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EXPORT_SYMBOL(i2c_write);
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