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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2014-07-08 13:46:37 +0300
committerVinod Koul <vinod.koul@intel.com>2014-07-28 17:03:13 +0530
commiteb3fe7def66511120766c8fc05ee9631cce7fe6f (patch)
treee6e1cf360c7446223e6658832be45085931fdf8d /arch/arm
parent85a70762b7c79983888bf4d34c6a6bbcf6b40e7d (diff)
downloadop-kernel-dev-eb3fe7def66511120766c8fc05ee9631cce7fe6f.zip
op-kernel-dev-eb3fe7def66511120766c8fc05ee9631cce7fe6f.tar.gz
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>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/common/edma.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index f834aae..8809917 100644
--- 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)
{
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