dmaengine/dw_dmac: provide a mechanism to indicate private devices

Some platforms (e.g. Picochip PC3XX) have multiple DMA controllers
where some may be used for slave transfers and others for general
purpose memcpy type transfers. Add a .is_private boolean to the
platform data structure so that controllers can be marked as private
so that the DMA_PRIVATE capability will be set for that controller.

Signed-off-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index a4cf2614085a3964ca291775efb359f212d931e3..08dab3badad2db79605e3dba0f82d3fc94f0923b 100644 (file)
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1341,6 +1341,8 @@ static int __init dw_probe(struct platform_device *pdev)
 
        dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
        dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
+       if (pdata->is_private)
+               dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
        dw->dma.dev = &pdev->dev;
        dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources;
        dw->dma.device_free_chan_resources = dwc_free_chan_resources;

diff --git a/include/linux/dw_dmac.h b/include/linux/dw_dmac.h
index 8014eb81054db07c2312ff34231ec4e493dc1da5..deec66b37180cf63d132eab997c45483be991d6a 100644 (file)
--- a/include/linux/dw_dmac.h
+++ b/include/linux/dw_dmac.h
@@ -16,9 +16,12 @@
 /**
  * struct dw_dma_platform_data - Controller configuration parameters
  * @nr_channels: Number of channels supported by hardware (max 8)
+ * @is_private: The device channels should be marked as private and not for
+ *     by the general purpose DMA channel allocator.
  */
 struct dw_dma_platform_data {
        unsigned int    nr_channels;
+       bool            is_private;
 };
 
 /**