dmaengine: at_hdmac: add wrappers for testing channel state

Cyclic property and paused state are encoded as bits in the channel status
bitfield. Tests of those bits are wrapped in convenient helper functions.

Signed-off-by: Nicolas Ferre <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/at_hdmac.c

···
 
 	/* for cyclic transfers,
 	 * no need to replay callback function while stopping */
-	if (!test_bit(ATC_IS_CYCLIC, &atchan->status)) {
+	if (!atc_chan_is_cyclic(atchan)) {
 		dma_async_tx_callback	callback = txd->callback;
 		void			*param = txd->callback_param;
 
···
 	spin_lock_irqsave(&atchan->lock, flags);
 	if (test_and_clear_bit(ATC_IS_ERROR, &atchan->status))
 		atc_handle_error(atchan);
-	else if (test_bit(ATC_IS_CYCLIC, &atchan->status))
+	else if (atc_chan_is_cyclic(atchan))
 		atc_handle_cyclic(atchan);
 	else
 		atc_advance_work(atchan);
···
 
 		spin_unlock_irqrestore(&atchan->lock, flags);
 	} else if (cmd == DMA_RESUME) {
-		if (!test_bit(ATC_IS_PAUSED, &atchan->status))
+		if (!atc_chan_is_paused(atchan))
 			return 0;
 
 		spin_lock_irqsave(&atchan->lock, flags);
···
 	else
 		dma_set_tx_state(txstate, last_complete, last_used, 0);
 
-	if (test_bit(ATC_IS_PAUSED, &atchan->status))
+	if (atc_chan_is_paused(atchan))
 		ret = DMA_PAUSED;
 
 	dev_vdbg(chan2dev(chan), "tx_status %d: cookie = %d (d%d, u%d)\n",
···
 	dev_vdbg(chan2dev(chan), "issue_pending\n");
 
 	/* Not needed for cyclic transfers */
-	if (test_bit(ATC_IS_CYCLIC, &atchan->status))
+	if (atc_chan_is_cyclic(atchan))
 		return;
 
 	spin_lock_irqsave(&atchan->lock, flags);
···
 			device_node) {
 		struct at_dma_chan *atchan = to_at_dma_chan(chan);
 		/* wait for transaction completion (except in cyclic case) */
-		if (atc_chan_is_enabled(atchan) &&
-		   !test_bit(ATC_IS_CYCLIC, &atchan->status))
+		if (atc_chan_is_enabled(atchan) && !atc_chan_is_cyclic(atchan))
 			return -EAGAIN;
 	}
 	return 0;
···
 
 	/* Channel should be paused by user
 	 * do it anyway even if it is not done already */
-	if (!test_bit(ATC_IS_PAUSED, &atchan->status)) {
+	if (!atc_chan_is_paused(atchan)) {
 		dev_warn(chan2dev(chan),
 		"cyclic channel not paused, should be done by channel user\n");
 		atc_control(chan, DMA_PAUSE, 0);
···
 			device_node) {
 		struct at_dma_chan *atchan = to_at_dma_chan(chan);
 
-		if (test_bit(ATC_IS_CYCLIC, &atchan->status))
+		if (atc_chan_is_cyclic(atchan))
 			atc_suspend_cyclic(atchan);
 		atchan->save_cfg = channel_readl(atchan, CFG);
 	}
···
 		struct at_dma_chan *atchan = to_at_dma_chan(chan);
 
 		channel_writel(atchan, CFG, atchan->save_cfg);
-		if (test_bit(ATC_IS_CYCLIC, &atchan->status))
+		if (atc_chan_is_cyclic(atchan))
 			atc_resume_cyclic(atchan);
 	}
 	return 0;

drivers/dma/at_hdmac_regs.h

···
 	return !!(dma_readl(atdma, CHSR) & atchan->mask);
 }
 
+/**
+ * atc_chan_is_paused - test channel pause/resume status
+ * @atchan: channel we want to test status
+ */
+static inline int atc_chan_is_paused(struct at_dma_chan *atchan)
+{
+	return test_bit(ATC_IS_PAUSED, &atchan->status);
+}
+
+/**
+ * atc_chan_is_cyclic - test if given channel has cyclic property set
+ * @atchan: channel we want to test status
+ */
+static inline int atc_chan_is_cyclic(struct at_dma_chan *atchan)
+{
+	return test_bit(ATC_IS_CYCLIC, &atchan->status);
+}
 
 /**
  * set_desc_eol - set end-of-link to descriptor so it will end transfer