+static void alchemy_8250_pm(struct uart_port *port, unsigned int state,
+ unsigned int old_state)
+{
+ switch (state) {
+ case 0:
+ if ((__raw_readl(port->membase + UART_MOD_CNTRL) & 3) != 3) {
+ /* power-on sequence as suggested in the databooks */
+ __raw_writel(0, port->membase + UART_MOD_CNTRL);
+ wmb();
+ __raw_writel(1, port->membase + UART_MOD_CNTRL);
+ wmb();
+ }
+ __raw_writel(3, port->membase + UART_MOD_CNTRL); /* full on */
+ wmb();
+ serial8250_do_pm(port, state, old_state);
+ break;
+ case 3: /* power off */
+ serial8250_do_pm(port, state, old_state);
+ __raw_writel(0, port->membase + UART_MOD_CNTRL);
+ wmb();
+ break;
+ default:
+ serial8250_do_pm(port, state, old_state);
+ break;
+ }
+}
+