From eb3fe7def66511120766c8fc05ee9631cce7fe6f Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Tue, 8 Jul 2014 13:46:37 +0300 Subject: 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 Acked-by: Sekhar Nori Signed-off-by: Vinod Koul --- arch/arm/common/edma.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'arch/arm/common') diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c index f834aae7720f..88099175fc56 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) { -- cgit v1.2.3