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ARM: edma: Add function to manually trigger an EDMA channel 

Manual trigger for events missed as a result of splitting a
scatter gather list and DMA'ing it in batches. Add a helper
function to trigger a channel incase any such events are missed.

Signed-off-by: Joel Fernandes <joelf@ti.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Joel Fernandes 2013-08-29 18:05:42 -05:00 committed by Vinod Koul
parent 534070622d
commit 96874b9a24
2 changed files with 19 additions and 0 deletions
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17
arch/arm/common/edma.c
View File

@ -1235,6 +1235,23 @@ void edma_resume(unsigned channel)
}
EXPORT_SYMBOL(edma_resume);
int edma_trigger_channel(unsigned channel)
{
unsigned ctlr;
unsigned int mask;
ctlr = EDMA_CTLR(channel);
channel = EDMA_CHAN_SLOT(channel);
mask = BIT(channel & 0x1f);
edma_shadow0_write_array(ctlr, SH_ESR, (channel >> 5), mask);
pr_debug("EDMA: ESR%d %08x\n", (channel >> 5),
edma_shadow0_read_array(ctlr, SH_ESR, (channel >> 5)));
return 0;
}
EXPORT_SYMBOL(edma_trigger_channel);
/**
* edma_start - start dma on a channel
* @channel: channel being activated

2
include/linux/platform_data/edma.h
View File

@ -180,4 +180,6 @@ struct edma_soc_info {
const s16 (*xbar_chans)[2];
};
int edma_trigger_channel(unsigned);
#endif