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dmaengine: freescale: add and export fsl_dma_external_start() 

The freescale driver uses custom device control FSLDMA_EXTERNAL_START to
put the controller in external start mode.
Since we are planning to deprecate the device control, move this to exported
API. Subsequent patches will remove the FSLDMA_EXTERNAL_START

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Vinod Koul 2014-10-11 21:16:44 +05:30
parent b65612a868
commit 0a5642be03
2 changed files with 28 additions and 1 deletions
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16
drivers/dma/fsldma.c
View File

@ -36,7 +36,7 @@
#include <linux/of_address.h> #include <linux/of_address.h>
#include <linux/of_irq.h> #include <linux/of_irq.h>
#include <linux/of_platform.h> #include <linux/of_platform.h>
#include <linux/fsldma.h>
#include "dmaengine.h" #include "dmaengine.h"
#include "fsldma.h" #include "fsldma.h"
@ -367,6 +367,20 @@ static void fsl_chan_toggle_ext_start(struct fsldma_chan *chan, int enable)
chan->feature &= ~FSL_DMA_CHAN_START_EXT; chan->feature &= ~FSL_DMA_CHAN_START_EXT;
} }
int fsl_dma_external_start(struct dma_chan *dchan, int enable)
{
struct fsldma_chan *chan;
if (!dchan)
return -EINVAL;
chan = to_fsl_chan(dchan);
fsl_chan_toggle_ext_start(chan, enable);
return 0;
}
EXPORT_SYMBOL_GPL(fsl_dma_external_start);
static void append_ld_queue(struct fsldma_chan *chan, struct fsl_desc_sw *desc) static void append_ld_queue(struct fsldma_chan *chan, struct fsl_desc_sw *desc)
{ {
struct fsl_desc_sw *tail = to_fsl_desc(chan->ld_pending.prev); struct fsl_desc_sw *tail = to_fsl_desc(chan->ld_pending.prev);

13
include/linux/fsldma.h Normal file
View File

@ -0,0 +1,13 @@
/*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef FSL_DMA_H
#define FSL_DMA_H
/* fsl dma API for enxternal start */
int fsl_dma_external_start(struct dma_chan *dchan, int enable);
#endif