DMA_CH_RIWT
XGMAC_DMA_IOWRITE_BITS(pdata->channel[i], DMA_CH_RIWT, RWT,
regval = readl(XLGMAC_DMA_REG(channel, DMA_CH_RIWT));
writel(regval, XLGMAC_DMA_REG(channel, DMA_CH_RIWT));