diff options
| author |   Murali Karicheri <m-karicheri2@ti.com> | 2015-03-03 14:44:57 -0600 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2015-03-12 11:43:09 -0500 |
| commit | 9a6d7298b0833614c411f774c46514efb1bd5651 (patch) | |
| tree | 3d05e9319e0fe78acb70dab565e497a86b68a60b /drivers/of | |
| parent | arm: dma-mapping: limit IOMMU mapping size (diff) | |
| download | linux-dev-9a6d7298b0833614c411f774c46514efb1bd5651.tar.xz linux-dev-9a6d7298b0833614c411f774c46514efb1bd5651.zip | |
of: Calculate device DMA masks based on DT dma-range size
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 <m-karicheri2@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Will Deacon <will.deacon@arm.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/device.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c index 28e743888402..20c1332a0018 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -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 "); |