diff options
Diffstat (limited to 'board/pcippc2/i2c.c')
| -rw-r--r-- | board/pcippc2/i2c.c | 257 |
1 files changed, 0 insertions, 257 deletions
diff --git a/board/pcippc2/i2c.c b/board/pcippc2/i2c.c deleted file mode 100644 index ab52562e6a..0000000000 --- a/board/pcippc2/i2c.c +++ /dev/null @@ -1,257 +0,0 @@ -/* - * (C) Copyright 2002 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that 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 <config.h> -#include <common.h> -#include <asm/io.h> - -#include "hardware.h" -#include "i2c.h" - -static void i2c_start (void); -static void i2c_stop (void); -static int i2c_write (u8 data); -static void i2c_read (u8 * data); - -static inline void i2c_port_start (void); -static inline void i2c_clock (unsigned int val); -static inline void i2c_data (unsigned int val); -static inline unsigned int - i2c_in (void); -static inline void i2c_write_bit (unsigned int val); -static inline unsigned int - i2c_read_bit (void); - -static inline void i2c_udelay (unsigned int time); - -int i2c_read_byte ( - u8 * data, - u8 dev, - u8 offset) -{ - int err = 0; - - i2c_start(); - - err = ! i2c_write(dev); - - if (! err) - { - err = ! i2c_write(offset); - } - - if (! err) - { - i2c_start(); - } - - if (! err) - { - err = ! i2c_write(dev | 0x01); - } - - if (! err) - { - i2c_read(data); - } - - i2c_stop(); - - return ! err; -} - -static inline void i2c_udelay ( - unsigned int time) -{ - int v; - - asm volatile("mtdec %0" : : "r" (time * ((CONFIG_SYS_BUS_CLK / 4) / 1000000))); - - do - { - asm volatile("isync; mfdec %0" : "=r" (v)); - } while (v >= 0); -} - - /* Low-level hardware access - */ - -#define BIT_GPDATA 0x80000000 -#define BIT_GPCLK 0x40000000 - -static inline void i2c_port_start (void) -{ - out32(REG(CPC0, GPDIR), in32(REG(CPC0, GPDIR)) & ~(BIT_GPCLK | BIT_GPDATA)); - out32(REG(CPC0, GPOUT), in32(REG(CPC0, GPOUT)) & ~(BIT_GPCLK | BIT_GPDATA)); - iobarrier_rw(); - - i2c_udelay(1); -} - -static inline void i2c_clock ( - unsigned int val) -{ - if (val) - { - out32(REG(CPC0, GPDIR), in32(REG(CPC0, GPDIR)) & ~BIT_GPCLK); - } - else - { - out32(REG(CPC0, GPDIR), in32(REG(CPC0, GPDIR)) | BIT_GPCLK); - } - - iobarrier_rw(); - - i2c_udelay(1); -} - -static inline void i2c_data ( - unsigned int val) -{ - if (val) - { - out32(REG(CPC0, GPDIR), in32(REG(CPC0, GPDIR)) & ~BIT_GPDATA); - } - else - { - out32(REG(CPC0, GPDIR), in32(REG(CPC0, GPDIR)) | BIT_GPDATA); - } - - iobarrier_rw(); - - i2c_udelay(1); -} - -static inline unsigned int i2c_in (void) -{ - unsigned int val = ((in32(REG(CPC0, GPIN)) & BIT_GPDATA) != 0)?1:0; - - iobarrier_rw(); - - return val; -} - - - /* Protocol implementation - */ - -static inline void i2c_write_bit ( - unsigned int val) -{ - i2c_data(val); - i2c_udelay(10); - i2c_clock(1); - i2c_udelay(10); - i2c_clock(0); - i2c_udelay(10); -} - -static inline unsigned int i2c_read_bit (void) -{ - unsigned int val; - - i2c_data(1); - i2c_udelay(10); - - i2c_clock(1); - i2c_udelay(10); - - val = i2c_in(); - - i2c_clock(0); - i2c_udelay(10); - - return val; -} - -unsigned int i2c_reset (void) -{ - unsigned int val; - int i; - - i2c_port_start(); - - i=0; - do { - i2c_udelay(10); - i2c_clock(0); - i2c_udelay(10); - i2c_clock(1); - i2c_udelay(10); - val = i2c_in(); - i++; - } while ((i<9)&&(val==0)); - return (val); -} - - -static void i2c_start (void) -{ - i2c_data(1); - i2c_clock(1); - i2c_udelay(10); - i2c_data(0); - i2c_udelay(10); - i2c_clock(0); - i2c_udelay(10); -} - -static void i2c_stop (void) -{ - i2c_data(0); - i2c_udelay(10); - i2c_clock(1); - i2c_udelay(10); - i2c_data(1); - i2c_udelay(10); -} - -static int i2c_write ( - u8 data) -{ - unsigned int i; - - for (i = 0; i < 8; i++) - { - i2c_write_bit(data >> 7); - data <<= 1; - } - - return i2c_read_bit() == 0; -} - -static void i2c_read ( - u8 * data) -{ - unsigned int i; - u8 val = 0; - - for (i = 0; i < 8; i++) - { - val <<= 1; - val |= i2c_read_bit(); - } - - *data = val; - i2c_write_bit(1); /* NoAck */ -} |