UART_MCTL_REG
val = bcm_uart_readl(port, UART_MCTL_REG);
bcm_uart_writel(port, val, UART_MCTL_REG);
val = bcm_uart_readl(port, UART_MCTL_REG);
val = bcm_uart_readl(port, UART_MCTL_REG);
bcm_uart_writel(port, val, UART_MCTL_REG);
val = bcm_uart_readl(port, UART_MCTL_REG);