RWTM_HOST_INT_MASK
reg = readl(mbox->base + RWTM_HOST_INT_MASK);
writel(reg, mbox->base + RWTM_HOST_INT_MASK);
reg = readl(mbox->base + RWTM_HOST_INT_MASK);
writel(reg, mbox->base + RWTM_HOST_INT_MASK);