[PATCH 3/9] ARM: edma: Add function to manually trigger an EDMA channel
From: Joel Fernandes <hidden>
Date: 2013-07-29 13:30:55
Also in:
linux-mmc, linux-omap, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
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 <redacted> --- arch/arm/common/edma.c | 21 +++++++++++++++++++++ include/linux/platform_data/edma.h | 2 ++ 2 files changed, 23 insertions(+)
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
index 3567ba1..10995b2 100644
--- a/arch/arm/common/edma.c
+++ b/arch/arm/common/edma.c@@ -1236,6 +1236,27 @@ void edma_resume(unsigned channel) } EXPORT_SYMBOL(edma_resume); +int edma_manual_trigger(unsigned channel) +{ + unsigned ctlr; + int j; + unsigned int mask; + + ctlr = EDMA_CTLR(channel); + channel = EDMA_CHAN_SLOT(channel); + mask = BIT(channel & 0x1f); + + j = channel >> 5; + + /* EDMA channels without event association */ + edma_shadow0_write_array(ctlr, SH_ESR, j, mask); + + pr_debug("EDMA: ESR%d %08x\n", j, + edma_shadow0_read_array(ctlr, SH_ESR, j)); + return 0; +} +EXPORT_SYMBOL(edma_manual_trigger); + /** * edma_start - start dma on a channel * @channel: channel being activated
diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
index 57300fd..0e11eca 100644
--- a/include/linux/platform_data/edma.h
+++ b/include/linux/platform_data/edma.h@@ -180,4 +180,6 @@ struct edma_soc_info { const s16 (*xbar_chans)[2]; }; +int edma_manual_trigger(unsigned); + #endif
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1.7.9.5