QUP_MX_READ_CNT
writel(0, qup->base + QUP_MX_READ_CNT);
writel(blk->total_rx_len, qup->base + QUP_MX_READ_CNT);
qup->base + QUP_MX_READ_CNT);
writel(0, qup->base + QUP_MX_READ_CNT);
controller->base + QUP_MX_READ_CNT);
writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
writel_relaxed(0, controller->base + QUP_MX_READ_CNT);