ARM: edma: Add edma_assign_channel_eventq() to move channel to a give queue

In some cases it is desired to move a channel to a specific event queue.
Such a use case is audio, where it is preferred that it is served with
highest priority compared to other DMA clients.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index f834aae7720fd958081ff01a3a36d3471eb5a111..88099175fc56c64be13c5a31e5cf05ed18b60e50 100644 (file)
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c
@@ -1414,6 +1414,34 @@ void edma_clear_event(unsigned channel)
 }
 EXPORT_SYMBOL(edma_clear_event);
 
+/*
+ * edma_assign_channel_eventq - move given channel to desired eventq
+ * Arguments:
+ *     channel - channel number
+ *     eventq_no - queue to move the channel
+ *
+ * Can be used to move a channel to a selected event queue.
+ */
+void edma_assign_channel_eventq(unsigned channel, enum dma_event_q eventq_no)
+{
+       unsigned ctlr;
+
+       ctlr = EDMA_CTLR(channel);
+       channel = EDMA_CHAN_SLOT(channel);
+
+       if (channel >= edma_cc[ctlr]->num_channels)
+               return;
+
+       /* default to low priority queue */
+       if (eventq_no == EVENTQ_DEFAULT)
+               eventq_no = edma_cc[ctlr]->default_queue;
+       if (eventq_no >= edma_cc[ctlr]->num_tc)
+               return;
+
+       map_dmach_queue(ctlr, channel, eventq_no);
+}
+EXPORT_SYMBOL(edma_assign_channel_eventq);
+
 static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
                              struct edma *edma_cc)
 {

diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
index eb8d5627d080dd5b90c4a1d6ea18faaba7233285..bdb2710e2aab0332c9cbdd6fcbe350e320ca0df7 100644 (file)
--- a/include/linux/platform_data/edma.h
+++ b/include/linux/platform_data/edma.h
@@ -150,6 +150,8 @@ void edma_clear_event(unsigned channel);
 void edma_pause(unsigned channel);
 void edma_resume(unsigned channel);
 
+void edma_assign_channel_eventq(unsigned channel, enum dma_event_q eventq_no);
+
 struct edma_rsv_info {
 
        const s16       (*rsv_chans)[2];