ata/pata_arasan_cf: fill dma chan->private from pdata->dma_priv

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 <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/ata/pata_arasan_cf.c

···
 	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 */
···
 
 static bool filter(struct dma_chan *chan, void *slave)
 {
+	chan->private = slave;
 	return true;
 }
 
···
 
 	/* 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;
···
 	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) {

include/linux/pata_arasan_cf_data.h

···
 	#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