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of: Calculate device DMA masks based on DT dma-range size

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Calculate the dma_mask and coherent_dma_mask based on the dma-range values
set in DT for the device.

Limit the mask to lower of the default mask and mask calculated.

Signed-off-by: Murali Karicheri <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
CC: Joerg Roedel <[email protected]>
CC: Grant Likely <[email protected]>
CC: Rob Herring <[email protected]>
CC: Will Deacon <[email protected]>
CC: Russell King <[email protected]>
CC: Arnd Bergmann <[email protected]>
CC: Suravee Suthikulpanit <[email protected]>
This commit is contained in:
Murali Karicheri 2015-03-03 14:44:57 -06:00 • committed by Bjorn Helgaas
commit 9a6d7298b0
1 changed files with 13 additions and 3 deletions
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16
drivers/of/device.c
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@ -90,10 +90,11 @@ void of_dma_configure(struct device *dev, struct device_node *np)
struct iommu_ops *iommu;
/*
* Set default dma-mask to 32 bit. Drivers are expected to setup
* the correct supported dma_mask.
* Set default coherent_dma_mask to 32 bit. Drivers are expected to
* setup the correct supported mask.
*/
dev->coherent_dma_mask = DMA_BIT_MASK(32);
if (!dev->coherent_dma_mask)
dev->coherent_dma_mask = DMA_BIT_MASK(32);
/*
* Set it to coherent_dma_mask by default if the architecture
@ -128,6 +129,15 @@ void of_dma_configure(struct device *dev, struct device_node *np)
dev->dma_pfn_offset = offset;
/*
* Limit coherent and dma mask based on size and default mask
* set by the driver.
*/
dev->coherent_dma_mask = min(dev->coherent_dma_mask,
DMA_BIT_MASK(ilog2(dma_addr + size)));
*dev->dma_mask = min((*dev->dma_mask),
DMA_BIT_MASK(ilog2(dma_addr + size)));
coherent = of_dma_is_coherent(np);
dev_dbg(dev, "device is%sdma coherent\n",
coherent ? " " : " not ");