device_readl
dev->avg_count = device_readl(dev, ACTMON_DEV_AVG_COUNT);
intr_status = device_readl(dev, ACTMON_DEV_INTR_STATUS);
dev_ctrl = device_readl(dev, ACTMON_DEV_CTRL);
stat->busy_time = device_readl(actmon_dev, ACTMON_DEV_AVG_COUNT);