2 files changed, 59 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/dma/arm-pl330.txt b/Documentation/devicetree/bindings/dma/arm-pl330.txt
new file mode 100644
index 000000000000..a4cd273b2a67
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/arm-pl330.txt
@@ -0,0 +1,30 @@
+* ARM PrimeCell PL330 DMA Controller
+
+The ARM PrimeCell PL330 DMA controller can move blocks of memory contents
+between memory and peripherals or memory to memory.
+
+Required properties:
+  - compatible: should include both "arm,pl330" and "arm,primecell".
+  - reg: physical base address of the controller and length of memory mapped
+    region.
+  - interrupts: interrupt number to the cpu.
+
+Example:
+
+        pdma0: pdma@12680000 {
+                compatible = "arm,pl330", "arm,primecell";
+                reg = <0x12680000 0x1000>;
+                interrupts = <99>;
+        };
+
+Client drivers (device nodes requiring dma transfers from dev-to-mem or
+mem-to-dev) should specify the DMA channel numbers using a two-value pair
+as shown below.
+
+  [property name]  = <[phandle of the dma controller] [dma request id]>;
+
+      where 'dma request id' is the dma request number which is connected
+      to the client controller. The 'property name' is recommended to be
+      of the form <name>-dma-channel.
+
+  Example:  tx-dma-channel = <&pdma0 12>;
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 317aaeaa6f66..a626e15799a5 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -19,6 +19,7 @@
 #include <linux/amba/pl330.h>
 #include <linux/pm_runtime.h>
 #include <linux/scatterlist.h>
+#include <linux/of.h>
 
 #define NR_DEFAULT_DESC 16
 
@@ -277,6 +278,20 @@ bool pl330_filter(struct dma_chan *chan, void *param)
         if (chan->device->dev->driver != &pl330_driver.drv)
                 return false;
 
+#ifdef CONFIG_OF
+        if (chan->device->dev->of_node) {
+                const __be32 *prop_value;
+                phandle phandle;
+                struct device_node *node;
+
+                prop_value = ((struct property *)param)->value;
+                phandle = be32_to_cpup(prop_value++);
+                node = of_find_node_by_phandle(phandle);
+                return ((chan->private == node) &&
+                                (chan->chan_id == be32_to_cpup(prop_value)));
+        }
+#endif
+
         peri_id = chan->private;
         return *peri_id == (unsigned)param;
 }
@@ -855,12 +870,17 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
         INIT_LIST_HEAD(&pd->channels);
 
         /* Initialize channel parameters */
-        num_chan = max(pdat ? pdat->nr_valid_peri : 0, (u8)pi->pcfg.num_chan);
+        num_chan = max(pdat ? pdat->nr_valid_peri : (u8)pi->pcfg.num_peri,
+                        (u8)pi->pcfg.num_chan);
         pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
 
         for (i = 0; i < num_chan; i++) {
                 pch = &pdmac->peripherals[i];
-                pch->chan.private = pdat ? &pdat->peri_id[i] : NULL;
+                if (!adev->dev.of_node)
+                        pch->chan.private = pdat ? &pdat->peri_id[i] : NULL;
+                else
+                        pch->chan.private = adev->dev.of_node;
+
                 INIT_LIST_HEAD(&pch->work_list);
                 spin_lock_init(&pch->lock);
                 pch->pl330_chid = NULL;
@@ -872,10 +892,15 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
         }
 
         pd->dev = &adev->dev;
-        if (pdat)
+        if (pdat) {
                 pd->cap_mask = pdat->cap_mask;
-        else
+        } else {
                 dma_cap_set(DMA_MEMCPY, pd->cap_mask);
+                if (pi->pcfg.num_peri) {
+                        dma_cap_set(DMA_SLAVE, pd->cap_mask);
+                        dma_cap_set(DMA_CYCLIC, pd->cap_mask);
+                }
+        }
 
         pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
         pd->device_free_chan_resources = pl330_free_chan_resources;