RRBR_RTHR
dev->r_reg = RRBR_RTHR(0);
writel(((u16(*)[2])buf)[tx_ptr][1], i2s_base + RRBR_RTHR(0));
writel(((u32(*)[2])buf)[tx_ptr][1], i2s_base + RRBR_RTHR(0));
readl(i2s_base + RRBR_RTHR(j));
readl(i2s_base + RRBR_RTHR(j));