dmaengine: Add device_terminate_all callback

Split out the terminate_all command from device_control to a dma_device
callback. In order to preserve backward capability, still rely on
device_control if no such callback has been implemented.

Eventually, this will allow to create a generic dma_slave_caps callback.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

include/linux/dmaengine.h

@@ -616,6 +616,8 @@ struct dma_tx_state {
  *	0 or an error code
  * @device_resume: Resumes any transfer on a channel previously
  *	paused. Returns 0 or an error code
+ * @device_terminate_all: Aborts all transfers on a channel. Returns 0
+ *	or an error code
  * @device_tx_status: poll for transaction completion, the optional
  *	txstate parameter can be supplied with a pointer to get a
  *	struct with auxiliary transfer status information, otherwise the call
@@ -687,6 +689,7 @@ struct dma_device {
 		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);
 
 	enum dma_status (*device_tx_status)(struct dma_chan *chan,
 					    dma_cookie_t cookie,
@@ -796,6 +799,9 @@ static inline int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_cap
 
 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);
 }