I have mpc8xx based board, with 2.4.18 kernel. I have m41t81 RTC chip hooked
on i2c bus. I am using i2c drivers from the denx ppc dev tree, and 8xx algo.
I modified the m41t11 driver of denx for my m41t81 chip. When my m41t81
based module calls cpm_iic_write function of i2c-algo-8xx, it hangs the
board. It hangs somewhere here..
if(count > 16){
/* Chip bug, set enable here */
local_irq_save(flags);
i2c->i2c_i2cmr = 0x13; /* Enable some interupts */
i2c->i2c_i2cer = 0xff;
i2c->i2c_i2mod |= 1; /* Enable */
i2c->i2c_i2com |= 0x80; /* Begin transmission */
/* Wait for IIC transfer */
tmo = interruptible_sleep_on_timeout(&iic_wait,1*HZ);
local_irq_restore(flags);
} else { /* busy wait for small transfers, its faster */
i2c->i2c_i2cmr = 0x00; /* Disable I2C interupts */
i2c->i2c_i2cer = 0xff;
i2c->i2c_i2mod |= 1; /* Enable */
/*CRAHSES SOMEWHERE HERE....*/
i2c->i2c_i2com |= 0x80; /* Begin transmission */
tmo = jiffies + 1*HZ;
while(!(i2c->i2c_i2cer & 0x12 || time_after(jiffies, tmo)));
/* Busy wait, with a timeout */
}
Any help is appreciated.
Thanks
Lokesh Kumar
Wireless Matrix USA Inc.
703-262-4032
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