QSPI_DMA_CTL
tegra_qspi_readl(tqspi, QSPI_DMA_CTL),
value = tegra_qspi_readl(tqspi, QSPI_DMA_CTL);
tegra_qspi_writel(tqspi, value, QSPI_DMA_CTL);
tegra_qspi_writel(tqspi, val, QSPI_DMA_CTL);
tegra_qspi_writel(tqspi, val, QSPI_DMA_CTL);