diff options
Diffstat (limited to 'cpu/mpc85xx/i2c.c')
| -rw-r--r-- | cpu/mpc85xx/i2c.c | 265 |
1 files changed, 0 insertions, 265 deletions
diff --git a/cpu/mpc85xx/i2c.c b/cpu/mpc85xx/i2c.c deleted file mode 100644 index 32dcf5d47e..0000000000 --- a/cpu/mpc85xx/i2c.c +++ /dev/null @@ -1,265 +0,0 @@ -/* - * (C) Copyright 2003,Motorola Inc. - * Xianghua Xiao <x.xiao@motorola.com> - * Adapted for Motorola 85xx chip. - * - * (C) Copyright 2003 - * Gleb Natapov <gnatapov@mrv.com> - * Some bits are taken from linux driver writen by adrian@humboldt.co.uk - * - * Hardware I2C driver for MPC107 PCI bridge. - * - * 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 <common.h> -#include <command.h> -#include <asm/io.h> - -#ifdef CONFIG_HARD_I2C -#include <i2c.h> - -#define TIMEOUT (CFG_HZ/4) - -#define I2C_Addr ((u8 *)(CFG_CCSRBAR + 0x3000)) - -#define I2CADR &I2C_Addr[0] -#define I2CFDR &I2C_Addr[4] -#define I2CCCR &I2C_Addr[8] -#define I2CCSR &I2C_Addr[12] -#define I2CCDR &I2C_Addr[16] -#define I2CDFSRR &I2C_Addr[20] - -#define I2C_READ 1 -#define I2C_WRITE 0 - -void -i2c_init(int speed, int slaveadd) -{ - /* stop I2C controller */ - writeb(0x0, I2CCCR); - - /* set clock */ - writeb(0x3f, I2CFDR); - - /* set default filter */ - writeb(0x10,I2CDFSRR); - - /* write slave address */ - writeb(slaveadd, I2CADR); - - /* clear status register */ - writeb(0x0, I2CCSR); - - /* start I2C controller */ - writeb(MPC85xx_I2CCR_MEN, I2CCCR); -} - -static __inline__ int -i2c_wait4bus (void) -{ - ulong timeval = get_timer (0); - - while (readb(I2CCSR) & MPC85xx_I2CSR_MBB) { - if (get_timer (timeval) > TIMEOUT) { - return -1; - } - } - - return 0; -} - -static __inline__ int -i2c_wait (int write) -{ - u32 csr; - ulong timeval = get_timer (0); - - do { - csr = readb(I2CCSR); - - if (!(csr & MPC85xx_I2CSR_MIF)) - continue; - - writeb(0x0, I2CCSR); - - if (csr & MPC85xx_I2CSR_MAL) { - debug("i2c_wait: MAL\n"); - return -1; - } - - if (!(csr & MPC85xx_I2CSR_MCF)) { - debug("i2c_wait: unfinished\n"); - return -1; - } - - if (write == I2C_WRITE && (csr & MPC85xx_I2CSR_RXAK)) { - debug("i2c_wait: No RXACK\n"); - return -1; - } - - return 0; - } while (get_timer (timeval) < TIMEOUT); - - debug("i2c_wait: timed out\n"); - return -1; -} - -static __inline__ int -i2c_write_addr (u8 dev, u8 dir, int rsta) -{ - writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX | - (rsta?MPC85xx_I2CCR_RSTA:0), - I2CCCR); - - writeb((dev << 1) | dir, I2CCDR); - - if (i2c_wait (I2C_WRITE) < 0) - return 0; - - return 1; -} - -static __inline__ int -__i2c_write (u8 *data, int length) -{ - int i; - - writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX, - I2CCCR); - - for (i=0; i < length; i++) { - writeb(data[i], I2CCDR); - - if (i2c_wait (I2C_WRITE) < 0) - break; - } - - return i; -} - -static __inline__ int -__i2c_read (u8 *data, int length) -{ - int i; - - writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | - ((length == 1) ? MPC85xx_I2CCR_TXAK : 0), - I2CCCR); - - /* dummy read */ - readb(I2CCDR); - - for (i=0; i < length; i++) { - if (i2c_wait (I2C_READ) < 0) - break; - - /* Generate ack on last next to last byte */ - if (i == length - 2) - writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | - MPC85xx_I2CCR_TXAK, - I2CCCR); - - /* Generate stop on last byte */ - if (i == length - 1) - writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_TXAK, I2CCCR); - - data[i] = readb(I2CCDR); - } - - return i; -} - -int -i2c_read (u8 dev, uint addr, int alen, u8 *data, int length) -{ - int i = 0; - u8 *a = (u8*)&addr; - - if (i2c_wait4bus () < 0) - goto exit; - - if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) - goto exit; - - if (__i2c_write (&a[4 - alen], alen) != alen) - goto exit; - - if (i2c_write_addr (dev, I2C_READ, 1) == 0) - goto exit; - - i = __i2c_read (data, length); - - exit: - writeb(MPC85xx_I2CCR_MEN, I2CCCR); - - return !(i == length); -} - -int -i2c_write (u8 dev, uint addr, int alen, u8 *data, int length) -{ - int i = 0; - u8 *a = (u8*)&addr; - - if (i2c_wait4bus () < 0) - goto exit; - - if (i2c_write_addr (dev, I2C_WRITE, 0) == 0) - goto exit; - - if (__i2c_write (&a[4 - alen], alen) != alen) - goto exit; - - i = __i2c_write (data, length); - - exit: - writeb(MPC85xx_I2CCR_MEN, I2CCCR); - - return !(i == length); -} - -int i2c_probe (uchar chip) -{ - int tmp; - - /* - * Try to read the first location of the chip. The underlying - * driver doesn't appear to support sending just the chip address - * and looking for an <ACK> back. - */ - udelay(10000); - return i2c_read (chip, 0, 1, (uchar *)&tmp, 1); -} - -uchar i2c_reg_read (uchar i2c_addr, uchar reg) -{ - uchar buf[1]; - - i2c_read (i2c_addr, reg, 1, buf, 1); - - return (buf[0]); -} - -void i2c_reg_write (uchar i2c_addr, uchar reg, uchar val) -{ - i2c_write (i2c_addr, reg, 1, &val, 1); -} - -#endif /* CONFIG_HARD_I2C */ |