dmaengine/dw_dmac: provide a mechanism to indicate private devices (95ea759e) · Commits · 戴 / test

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>

drivers/dma/dw_dmac.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;

include/linux/dw_dmac.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;
		};

		/**

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