linux-kernel - [PATCH] dmaengine: at_hdmac: add wrappers for testing channel state

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Message-Id: <a04c691d57da727d0b68affb424e3fec44cfd421.1311627477.git.nicolas.ferre@atmel.com>
Date:	Mon, 25 Jul 2011 23:09:23 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	vinod.koul@...el.com, dan.j.williams@...el.com,
	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>
Subject: [PATCH] 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 <nicolas.ferre@...el.com>
---
 drivers/dma/at_hdmac.c      |   19 +++++++++----------
 drivers/dma/at_hdmac_regs.h |   17 +++++++++++++++++
 2 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 99bd2c18..26a1196 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -301,7 +301,7 @@ atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
 
 	/* 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;
 
@@ -478,7 +478,7 @@ static void atc_tasklet(unsigned long data)
 	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);
@@ -945,7 +945,7 @@ static int atc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 
 		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);
@@ -1035,7 +1035,7 @@ atc_tx_status(struct dma_chan *chan,
 	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",
@@ -1057,7 +1057,7 @@ static void atc_issue_pending(struct dma_chan *chan)
 	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);
@@ -1395,8 +1395,7 @@ static int at_dma_prepare(struct device *dev)
 			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;
@@ -1408,7 +1407,7 @@ static void atc_suspend_cyclic(struct at_dma_chan *atchan)
 
 	/* 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);
@@ -1432,7 +1431,7 @@ static int at_dma_suspend_noirq(struct device *dev)
 			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);
 	}
@@ -1484,7 +1483,7 @@ static int at_dma_resume_noirq(struct device *dev)
 		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;
diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h
index 6f0c4a3..aa4c9ae 100644
--- a/drivers/dma/at_hdmac_regs.h
+++ b/drivers/dma/at_hdmac_regs.h
@@ -362,6 +362,23 @@ static inline int atc_chan_is_enabled(struct at_dma_chan *atchan)
 	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
-- 
1.7.4.1

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