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DMA: PL330: Add xlate function

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Add xlate to translate the device-tree binding information into
the appropriate format. The filter function requires the dma
controller device and dma channel number as filter_params.

Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Padmavathi Venna 2013-02-14 09:10:06 +05:30 committed by Vinod Koul
parent 34d19355b8
commit a80258f9b2
1 changed files with 25 additions and 0 deletions
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25
drivers/dma/pl330.c
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@ -25,6 +25,7 @@
#include <linux/amba/pl330.h> #include <linux/amba/pl330.h>
#include <linux/scatterlist.h> #include <linux/scatterlist.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/of_dma.h>
#include "dmaengine.h" #include "dmaengine.h"
#define PL330_MAX_CHAN 8 #define PL330_MAX_CHAN 8
@ -2379,6 +2380,30 @@ bool pl330_filter(struct dma_chan *chan, void *param)
} }
EXPORT_SYMBOL(pl330_filter); EXPORT_SYMBOL(pl330_filter);
static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
int count = dma_spec->args_count;
struct dma_pl330_dmac *pdmac = ofdma->of_dma_data;
struct dma_pl330_filter_args fargs;
dma_cap_mask_t cap;
if (!pdmac)
return NULL;
if (count != 1)
return NULL;
fargs.pdmac = pdmac;
fargs.chan_id = dma_spec->args[0];
dma_cap_zero(cap);
dma_cap_set(DMA_SLAVE, cap);
dma_cap_set(DMA_CYCLIC, cap);
return dma_request_channel(cap, pl330_dt_filter, &fargs);
}
static int pl330_alloc_chan_resources(struct dma_chan *chan) static int pl330_alloc_chan_resources(struct dma_chan *chan)
{ {
struct dma_pl330_chan *pch = to_pchan(chan); struct dma_pl330_chan *pch = to_pchan(chan);