/* * (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 * * Change log: * * 20050101: Eran Liberty (liberty@freescale.com) * Initial file creating (porting from 85XX & 8260) */ #include <common.h> #include <command.h> #include <asm/io.h> #ifdef CONFIG_HARD_I2C #include <i2c.h> #include <asm/i2c.h> #if defined(CONFIG_MPC8349EMDS) || defined(CONFIG_TQM834X) i2c_t * mpc8349_i2c = (i2c_t*)(CFG_IMMRBAR + CFG_I2C_OFFSET); #endif void i2c_init(int speed, int slaveadd) { /* stop I2C controller */ writeb(0x00 , &I2C->cr); /* set clock */ writeb(0x3f, &I2C->fdr); /* set default filter */ writeb(0x10,&I2C->dfsrr); /* write slave address */ writeb(slaveadd, &I2C->adr); /* clear status register */ writeb(0x00, &I2C->sr); /* start I2C controller */ writeb(I2C_CR_MEN, &I2C->cr); } static __inline__ int i2c_wait4bus (void) { ulong timeval = get_timer (0); while (readb(&I2C->sr) & I2C_SR_MBB) { if (get_timer (timeval) > I2C_TIMEOUT) { return -1; } } return 0; } static __inline__ int i2c_wait (int write) { u32 csr; ulong timeval = get_timer(0); do { csr = readb(&I2C->sr); if (!(csr & I2C_SR_MIF)) continue; writeb(0x0, &I2C->sr); if (csr & I2C_SR_MAL) { debug("i2c_wait: MAL\n"); return -1; } if (!(csr & I2C_SR_MCF)) { debug("i2c_wait: unfinished\n"); return -1; } if (write == I2C_WRITE && (csr & I2C_SR_RXAK)) { debug("i2c_wait: No RXACK\n"); return -1; } return 0; } while (get_timer (timeval) < I2C_TIMEOUT); debug("i2c_wait: timed out\n"); return -1; } static __inline__ int i2c_write_addr (u8 dev, u8 dir, int rsta) { writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX | (rsta?I2C_CR_RSTA:0), &I2C->cr); writeb((dev << 1) | dir, &I2C->dr); if (i2c_wait (I2C_WRITE) < 0) return 0; return 1; } static __inline__ int __i2c_write (u8 *data, int length) { int i; writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX, &I2C->cr); for (i=0; i < length; i++) { writeb(data[i], &I2C->dr); if (i2c_wait (I2C_WRITE) < 0) break; } return i; } static __inline__ int __i2c_read (u8 *data, int length) { int i; writeb(I2C_CR_MEN | I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0), &I2C->cr); /* dummy read */ readb(&I2C->dr); 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(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_TXAK, &I2C->cr); /* Generate stop on last byte */ if (i == length - 1) writeb(I2C_CR_MEN | I2C_CR_TXAK, &I2C->cr); data[i] = readb(&I2C->dr); } 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(I2C_CR_MEN, &I2C->cr); 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(I2C_CR_MEN, &I2C->cr); 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 */