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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>
This commit is contained in:
Jamie Iles 2011-01-21 14:11:54 +00:00 committed by Dan Williams
parent f301c062dc
commit 95ea759e9e
2 changed files with 5 additions and 0 deletions
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2
drivers/dma/dw_dmac.c
View File

@ -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;

3
include/linux/dw_dmac.h
View File

@ -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;
};
/**