M2P_CONTROL
writel(control, edmac->regs + M2P_CONTROL);
readl(edmac->regs + M2P_CONTROL);
control = readl(edmac->regs + M2P_CONTROL);
u32 control = readl(edmac->regs + M2P_CONTROL);
control = readl(edmac->regs + M2P_CONTROL);