u-boot/cpu/mpc86xx/i2c.c
Jon Loeliger c934f655f9 Review cleanups.
Signed-off-by: Jon Loeliger <jdl@freescale.com>
2006-05-31 14:01:32 -05:00

267 lines
5 KiB
C

/*
* (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
*
* Modified for MPC86xx by Jeff Brown
*
* 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 + 0x3100))
#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(MPC86xx_I2CCR_MEN, I2CCCR);
}
static __inline__ int
i2c_wait4bus(void)
{
ulong timeval = get_timer (0);
while (readb(I2CCSR) & MPC86xx_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 & MPC86xx_I2CSR_MIF))
continue;
writeb(0x0, I2CCSR);
if (csr & MPC86xx_I2CSR_MAL) {
debug("i2c_wait: MAL\n");
return -1;
}
if (!(csr & MPC86xx_I2CSR_MCF)) {
debug("i2c_wait: unfinished\n");
return -1;
}
if (write == I2C_WRITE && (csr & MPC86xx_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(MPC86xx_I2CCR_MEN | MPC86xx_I2CCR_MSTA | MPC86xx_I2CCR_MTX
| (rsta ? MPC86xx_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(MPC86xx_I2CCR_MEN | MPC86xx_I2CCR_MSTA | MPC86xx_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(MPC86xx_I2CCR_MEN | MPC86xx_I2CCR_MSTA
| ((length == 1) ? MPC86xx_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(MPC86xx_I2CCR_MEN | MPC86xx_I2CCR_MSTA
| MPC86xx_I2CCR_TXAK,
I2CCCR);
/* Generate stop on last byte */
if (i == length - 1)
writeb(MPC86xx_I2CCR_MEN | MPC86xx_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(MPC86xx_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(MPC86xx_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, (char *)&tmp, 1);
}
uchar i2c_reg_read (uchar i2c_addr, uchar reg)
{
char 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 */