UTSR0
writel(0xff, micro->base + UTSR0);
status = readl(micro->base + UTSR0);
writel(UTSR0_RID, micro->base + UTSR0);
micro->base + UTSR0);
status = readl(micro->base + UTSR0);
#define UART_GET_UTSR0(sport) __raw_readl((sport)->port.membase + UTSR0)
#define UART_PUT_UTSR0(sport,v) __raw_writel((v),(sport)->port.membase + UTSR0)