DMA_CONTROL_ST
value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
value |= DMA_CONTROL_ST | DMA_CONTROL_SR;
value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);
writel(reg & ~DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
writel(reg | DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
value |= DMA_CONTROL_ST;
value &= ~DMA_CONTROL_ST;
value |= DMA_CONTROL_ST;
value &= ~DMA_CONTROL_ST;
value &= ~(DMA_CONTROL_ST | DMA_CONTROL_SR);