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authorThomas Abraham <thomas.abraham@linaro.org>2011-10-24 11:43:31 +0200
committerKukjin Kim <kgene.kim@samsung.com>2011-12-23 10:07:04 +0900
commit93ed55441245a39e3935f5cf1af3e22febcce905 (patch)
tree5e238c5e269274fd47c1d03cb0a1c6172feef8fc /drivers/dma
parente1cd8454dac99473c2349efce1346264c494f28d (diff)
downloadop-kernel-dev-93ed55441245a39e3935f5cf1af3e22febcce905.zip
op-kernel-dev-93ed55441245a39e3935f5cf1af3e22febcce905.tar.gz
DMA: PL330: Add device tree support
For PL330 dma controllers instantiated from device tree, the channel lookup is based on phandle of the dma controller and dma request id specified by the client node. During probe, the private data of each channel of the controller is set to point to the device node of the dma controller. The 'chan_id' of the each channel is used as the dma request id. Client driver requesting dma channels specify the phandle of the dma controller and the request id. The pl330 filter function converts the phandle to the device node pointer and matches that with channel's private data. If a match is found, the request id from the client node and the 'chan_id' of the channel is matched. A channel is found if both the values match. Acked-by: Jassi Brar <jassisinghbrar@gmail.com> Acked-by: Boojin Kim <boojin.kim@samsung.com> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Reviewed-by: Rob Herring <rob.herring@calxeda.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.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 317aaea..a626e15 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;
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