[PATCH v3 59/59] dmaengine: Remove device_control and device_slave_caps

[Maxime Ripard]

Now that device_control has been split into several functions, and
device_slave_caps rendered useless, we can safely remove them.

Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
---
 include/linux/dmaengine.h | 52 ++++++-----------------------------------------
 1 file changed, 6 insertions(+), 46 deletions(-)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 98f8163dfbac..c157857a40e0 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -189,25 +189,6 @@ enum dma_ctrl_flags {
 };
 
 /**
- * enum dma_ctrl_cmd - DMA operations that can optionally be exercised
- * on a running channel.
- * @DMA_TERMINATE_ALL: terminate all ongoing transfers
- * @DMA_PAUSE: pause ongoing transfers
- * @DMA_RESUME: resume paused transfer
- * @DMA_SLAVE_CONFIG: this command is only implemented by DMA controllers
- * that need to runtime reconfigure the slave channels (as opposed to passing
- * configuration data in statically from the platform). An additional
- * argument of struct dma_slave_config must be passed in with this
- * command.
- */
-enum dma_ctrl_cmd {
-	DMA_TERMINATE_ALL,
-	DMA_PAUSE,
-	DMA_RESUME,
-	DMA_SLAVE_CONFIG,
-};
-
-/**
  * enum sum_check_bits - bit position of pq_check_flags
  */
 enum sum_check_bits {
@@ -336,9 +317,8 @@ enum dma_slave_buswidth {
  * This struct is passed in as configuration data to a DMA engine
  * in order to set up a certain channel for DMA transport at runtime.
  * The DMA device/engine has to provide support for an additional
- * command in the channel config interface, DMA_SLAVE_CONFIG
- * and this struct will then be passed in as an argument to the
- * DMA engine device_control() function.
+ * callback in the dma_device structure, device_config and this struct
+ * will then be passed in as an argument to the function.
  *
  * The rationale for adding configuration information to this struct is as
  * follows: if it is likely that more than one DMA slave controllers in
@@ -617,8 +597,6 @@ struct dma_tx_state {
  * @device_prep_interleaved_dma: Transfer expression in a generic way.
  * @device_config: Pushes a new configuration to a channel, return 0 or an error
  *	code
- * @device_control: manipulate all pending operations on a channel, returns
- *	zero or error code
  * @device_pause: Pauses any transfer happening on a channel. Returns
  *	0 or an error code
  * @device_resume: Resumes any transfer on a channel previously
@@ -630,7 +608,6 @@ struct dma_tx_state {
  *	struct with auxiliary transfer status information, otherwise the call
  *	will just return a simple status code
  * @device_issue_pending: push pending transactions to hardware
- * @device_slave_caps: return the slave channel capabilities
  */
 struct dma_device {
 
@@ -698,8 +675,6 @@ struct dma_device {
 
 	int (*device_config)(struct dma_chan *chan,
 			     struct dma_slave_config *config);
-	int (*device_control)(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
-		unsigned long arg);
 	int (*device_pause)(struct dma_chan *chan);
 	int (*device_resume)(struct dma_chan *chan);
 	int (*device_terminate_all)(struct dma_chan *chan);
@@ -708,27 +683,15 @@ struct dma_device {
 					    dma_cookie_t cookie,
 					    struct dma_tx_state *txstate);
 	void (*device_issue_pending)(struct dma_chan *chan);
-	int (*device_slave_caps)(struct dma_chan *chan, struct dma_slave_caps *caps);
 };
 
-static inline int dmaengine_device_control(struct dma_chan *chan,
-					   enum dma_ctrl_cmd cmd,
-					   unsigned long arg)
-{
-	if (chan->device->device_control)
-		return chan->device->device_control(chan, cmd, arg);
-
-	return -ENOSYS;
-}
-
 static inline int dmaengine_slave_config(struct dma_chan *chan,
 					  struct dma_slave_config *config)
 {
 	if (chan->device->device_config)
 		return chan->device->device_config(chan, config);
 
-	return dmaengine_device_control(chan, DMA_SLAVE_CONFIG,
-			(unsigned long)config);
+	return -ENOSYS;
 }
 
 static inline bool is_slave_direction(enum dma_transfer_direction direction)
@@ -808,9 +771,6 @@ static inline int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_cap
 	if (!test_bit(DMA_SLAVE, device->cap_mask.bits))
 		return -ENXIO;
 
-	if (device->device_slave_caps)
-		return device->device_slave_caps(chan, caps);
-
 	/*
 	 * Check whether it reports it uses the generic slave
 	 * capabilities, if not, that means it doesn't support any
@@ -835,7 +795,7 @@ static inline int dmaengine_terminate_all(struct dma_chan *chan)
 	if (chan->device->device_terminate_all)
 		return chan->device->device_terminate_all(chan);
 
-	return dmaengine_device_control(chan, DMA_TERMINATE_ALL, 0);
+	return -ENOSYS;
 }
 
 static inline int dmaengine_pause(struct dma_chan *chan)
@@ -843,7 +803,7 @@ static inline int dmaengine_pause(struct dma_chan *chan)
 	if (chan->device->device_pause)
 		return chan->device->device_pause(chan);
 
-	return dmaengine_device_control(chan, DMA_PAUSE, 0);
+	return -ENOSYS;
 }
 
 static inline int dmaengine_resume(struct dma_chan *chan)
@@ -851,7 +811,7 @@ static inline int dmaengine_resume(struct dma_chan *chan)
 	if (chan->device->device_resume)
 		return chan->device->device_resume(chan);
 
-	return dmaengine_device_control(chan, DMA_RESUME, 0);
+	return -ENOSYS;
 }
 
 static inline enum dma_status dmaengine_tx_status(struct dma_chan *chan,
-- 
2.1.1

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