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@xxxxxxxxxxx>
---
drivers/dma/pl330.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 80680ee..6196cc0 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -25,6 +25,7 @@
#include <linux/amba/pl330.h>
#include <linux/scatterlist.h>
#include <linux/of.h>
+#include <linux/of_dma.h>
#include "dmaengine.h"
#define PL330_MAX_CHAN 8
@@ -606,6 +607,11 @@ struct dma_pl330_desc {
struct dma_pl330_chan *pchan;
};
+struct dma_pl330_filter_args {
+ struct dma_pl330_dmac *pdmac;
+ unsigned int chan_id;
+};
+
static inline void _callback(struct pl330_req *r, enum pl330_op_err err)
{
if (r && r->xfer_cb)
@@ -2352,6 +2358,31 @@ static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
tasklet_schedule(&pch->task);
}
+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_filter, &fargs);
+}
+EXPORT_SYMBOL_GPL(of_dma_pl330_xlate);
+
bool pl330_filter(struct dma_chan *chan, void *param)
{
u8 *peri_id;
--
1.7.4.4
--
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