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dmaengine: at_hdmac: add FIFO configuration parameter to DMA DT binding

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For most devices the FIFO configuration is the same i.e. when half FIFO size is
available/filled, a source/destination request is serviced. But USART devices
have to do it when there is enough space/data available to perform a single
AHB access so the ASAP configuration.

Acked-by: Nicolas Ferre <[email protected]>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <[email protected]>
Signed-off-by: Ludovic Desroches <[email protected]>
Signed-off-by: Nicolas Ferre <[email protected]>
This commit is contained in:
Ludovic Desroches 2013-06-13 10:39:39 +02:00 • committed by Vinod Koul
commit 62971b2982
2 changed files with 26 additions and 6 deletions
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25
drivers/dma/at_hdmac.c
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@ -14,6 +14,7 @@
* found on AT91SAM9263.
*/
#include <dt-bindings/dma/at91.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
@ -1320,15 +1321,31 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec,
atslave = devm_kzalloc(&dmac_pdev->dev, sizeof(*atslave), GFP_KERNEL);
if (!atslave)
return NULL;
atslave->cfg = ATC_DST_H2SEL_HW | ATC_SRC_H2SEL_HW;
/*
* We can fill both SRC_PER and DST_PER, one of these fields will be
* ignored depending on DMA transfer direction.
*/
per_id = dma_spec->args[1];
atslave->cfg = ATC_FIFOCFG_HALFFIFO
| ATC_DST_H2SEL_HW | ATC_SRC_H2SEL_HW
| ATC_DST_PER_MSB(per_id) | ATC_DST_PER(per_id)
per_id = dma_spec->args[1] & AT91_DMA_CFG_PER_ID_MASK;
atslave->cfg |= ATC_DST_PER_MSB(per_id) | ATC_DST_PER(per_id)
| ATC_SRC_PER_MSB(per_id) | ATC_SRC_PER(per_id);
/*
* We have to translate the value we get from the device tree since
* the half FIFO configuration value had to be 0 to keep backward
* compatibility.
*/
switch (dma_spec->args[1] & AT91_DMA_CFG_FIFOCFG_MASK) {
case AT91_DMA_CFG_FIFOCFG_ALAP:
atslave->cfg |= ATC_FIFOCFG_LARGESTBURST;
break;
case AT91_DMA_CFG_FIFOCFG_ASAP:
atslave->cfg |= ATC_FIFOCFG_ENOUGHSPACE;
break;
case AT91_DMA_CFG_FIFOCFG_HALF:
default:
atslave->cfg |= ATC_FIFOCFG_HALFFIFO;
}
atslave->dma_dev = &dmac_pdev->dev;
chan = dma_request_channel(mask, at_dma_filter, atslave);