I2C_DMA_CLR_FLAG
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_INT_FLAG);
writel(I2C_DMA_CLR_FLAG | dma_sync, i2c->pdmabase + OFFSET_CON);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);