Some DMA controllers (eg: drivers/dma/dw_dmac*) allow platform specific
configuration for dma transfers. User drivers need to set chan->private field
of channel with pointer to configuration data. This patch takes dma_priv data
from platform data and passes it to chan->private_data, in order to pass
platform specific configuration to DMAC controller.
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxx>
---
drivers/ata/pata_arasan_cf.c | 7 ++++++-
include/linux/pata_arasan_cf_data.h | 2 ++
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/ata/pata_arasan_cf.c b/drivers/ata/pata_arasan_cf.c
index b99b3fc..d67bff7 100644
--- a/drivers/ata/pata_arasan_cf.c
+++ b/drivers/ata/pata_arasan_cf.c
@@ -210,6 +210,8 @@ struct arasan_cf_dev {
struct dma_chan *dma_chan;
/* Mask for DMA transfers */
dma_cap_mask_t mask;
+ /* dma channel private data */
+ void *dma_priv;
/* DMA transfer work */
struct work_struct work;
/* DMA delayed finish work */
@@ -356,6 +358,7 @@ static void dma_callback(void *dev)
static bool filter(struct dma_chan *chan, void *slave)
{
+ chan->private = slave;
return true;
}
@@ -526,7 +529,8 @@ static void data_xfer(struct work_struct *work)
/* request dma channels */
/* dma_request_channel may sleep, so calling from process context */
- acdev->dma_chan = dma_request_channel(acdev->mask, filter, NULL);
+ acdev->dma_chan = dma_request_channel(acdev->mask, filter,
+ acdev->dma_priv);
if (!acdev->dma_chan) {
dev_err(acdev->host->dev, "Unable to get dma_chan\n");
goto chan_request_fail;
@@ -853,6 +857,7 @@ static int __devinit arasan_cf_probe(struct platform_device *pdev)
INIT_WORK(&acdev->work, data_xfer);
INIT_DELAYED_WORK(&acdev->dwork, delayed_finish);
dma_cap_set(DMA_MEMCPY, acdev->mask);
+ acdev->dma_priv = pdata->dma_priv;
/* Handle platform specific quirks */
if (pdata->quirk) {
diff --git a/include/linux/pata_arasan_cf_data.h b/include/linux/pata_arasan_cf_data.h
index d979fe6..a6ee9aa 100644
--- a/include/linux/pata_arasan_cf_data.h
+++ b/include/linux/pata_arasan_cf_data.h
@@ -37,6 +37,8 @@ struct arasan_cf_pdata {
#define CF_BROKEN_PIO (1)
#define CF_BROKEN_MWDMA (1 << 1)
#define CF_BROKEN_UDMA (1 << 2)
+ /* This is platform specific data for the DMA controller */
+ void *dma_priv;
};
static inline void
--
1.7.2.2
--
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