UART01x_DR
ch = readb(port->membase + UART01x_DR);
writel(ch, port->membase + UART01x_DR),
writel(ch, port->membase + UART01x_DR);
[REG_DR] = UART01x_DR,
writel(c, port->membase + UART01x_DR);
writel(c, port->membase + UART01x_DR);
writeb(c, port->membase + UART01x_DR);
return readl(port->membase + UART01x_DR);
return readb(port->membase + UART01x_DR);
[REG_DR] = UART01x_DR,