diff options
| -rw-r--r-- | Documentation/devicetree/bindings/dma/arm-pl330.txt | 30 | ||||
| -rw-r--r-- | drivers/dma/pl330.c | 33 |
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; |