XP_I2C_MUTEX
XP_IOWRITE(pdata, XP_I2C_MUTEX, XGBE_MUTEX_RELEASE);
XP_SET_BITS(mutex_id, XP_I2C_MUTEX, ID, phy_data->port_id);
XP_SET_BITS(mutex_id, XP_I2C_MUTEX, ACTIVE, 1);
if (XP_IOREAD(pdata, XP_I2C_MUTEX) ||
XP_IOWRITE(pdata, XP_I2C_MUTEX, mutex_id);