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authorThomas Abraham <thomas.abraham@linaro.org>2011-10-24 11:43:02 +0200
committerKukjin Kim <kgene.kim@samsung.com>2011-12-23 10:07:02 +0900
commit3e2ec13a8185183cd7ff237dadc948a0f9f7398f (patch)
treefa5efc91ccbb6fe013c2614ac9b676c4192b6f60 /drivers/dma
parenta169a888bf8c5490ae0377fcd0ad22c6af9fd8e7 (diff)
downloadlinux-3e2ec13a8185183cd7ff237dadc948a0f9f7398f.tar.bz2
DMA: PL330: move filter function into driver
The dma channel selection filter function is moved from plat-samsung into the pl330 driver. In additon to that, a check is added in the filter function to ensure that the channel on which the filter has been invoked is pl330 channel instance (and avoid any incorrect access of chan->private in a system with multiple types of DMA drivers). Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Jassi Brar <jassisinghbrar@gmail.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/pl330.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 571041477ab2..0c434dca4bf2 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -116,6 +116,9 @@ struct dma_pl330_desc {
struct dma_pl330_chan *pchan;
};
+/* forward declaration */
+static struct amba_driver pl330_driver;
+
static inline struct dma_pl330_chan *
to_pchan(struct dma_chan *ch)
{
@@ -267,6 +270,18 @@ static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
tasklet_schedule(&pch->task);
}
+bool pl330_filter(struct dma_chan *chan, void *param)
+{
+ struct dma_pl330_peri *peri;
+
+ if (chan->device->dev->driver != &pl330_driver.drv)
+ return false;
+
+ peri = chan->private;
+ return peri->peri_id == (unsigned)param;
+}
+EXPORT_SYMBOL(pl330_filter);
+
static int pl330_alloc_chan_resources(struct dma_chan *chan)
{
struct dma_pl330_chan *pch = to_pchan(chan);