CTRLB 231 drivers/dma/at_hdmac.c channel_readl(atchan, CTRLB), CTRLB 243 drivers/dma/at_hdmac.c channel_writel(atchan, CTRLB, 0); CTRLB 2105 drivers/dma/at_hdmac.c channel_writel(atchan, CTRLB, 0); CTRLB 373 drivers/dma/at_hdmac_regs.h channel_readl(atchan, CTRLB),