linux-kernel - Re: [PATCH 2/2] dma: pl330: Use the generic of_dma_xlate_by_chan

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Message-id: <19148230.174331364884064812.JavaMail.weblogic@epv6ml02>
Date:	Tue, 02 Apr 2013 06:27:47 +0000 (GMT)
From:	PADMAVATHI VENNA <padma.v@...sung.com>
To:	Lars-Peter Clausen <lars@...afoo.de>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>
Cc:	Jon Hunter <jon-hunter@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] dma: pl330: Use the generic of_dma_xlate_by_chan_id


Hi,
------- Original Message -------
Sender : Lars-Peter Clausen<lars@...afoo.de>
Date : Mar 25, 2013 22:16 (GMT+09:00)
Title : [PATCH 2/2] dma: pl330: Use the generic of_dma_xlate_by_chan_id

Use the generic of_dma_xlate_by_chan_id xlate callback instead of a custom
implementation.

There is one minor difference between the generic of_dma_xlate_by_chan_id
function and the pl330 specific one. of_dma_xlate_by_chan_id only sets the
DMA_SLAVE capability for the channel capability mask, while the pl330 driver
additionally sets the DMA_CYCLIC capability. But since all pl330 channels which
have the DMA_SLAVE capability set also have DMA_CYCLIC capability set both
functions will have the same result.

I am not clear about the dma capabilities. Is it mentioned some where that if we set DMA_SLAVE capability
will that also set DMA_CYCLIC capability?

Signed-off-by: Lars-Peter Clausen 
---
drivers/dma/pl330.c | 41 +----------------------------------------
1 file changed, 1 insertion(+), 40 deletions(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 345e2a1..ea48de7 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -608,11 +608,6 @@ 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)
@@ -2358,16 +2353,6 @@ static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
tasklet_schedule(&pch->task);
}

-static bool pl330_dt_filter(struct dma_chan *chan, void *param)
-{
- struct dma_pl330_filter_args *fargs = param;
-
- if (chan->device != &fargs->pdmac->ddma)
- return false;
-
- return (chan->chan_id == fargs->chan_id);
-}
-
bool pl330_filter(struct dma_chan *chan, void *param)
{
u8 *peri_id;
@@ -2380,30 +2365,6 @@ bool pl330_filter(struct dma_chan *chan, void *param)
}
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)
{
struct dma_pl330_chan *pch = to_pchan(chan);
@@ -2996,7 +2957,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
pi->pcfg.num_peri, pi->pcfg.num_events);

ret = of_dma_controller_register(adev->dev.of_node,
- of_dma_pl330_xlate, pdmac);
+ of_dma_xlate_by_chan_id, pd);
if (ret) {
dev_err(&adev->dev,
"unable to register DMA to the generic DT DMA helpers\n");
-- 
1.8.0