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authorMurali Karicheri <m-karicheri2@ti.com>2015-03-03 23:44:57 +0300
committerBjorn Helgaas <bhelgaas@google.com>2015-03-12 19:43:09 +0300
commit9a6d7298b0833614c411f774c46514efb1bd5651 (patch)
tree3d05e9319e0fe78acb70dab565e497a86b68a60b /drivers/of
parent22b3c181c6c324a46f71aae806d8ddbe61d25761 (diff)
downloadlinux-9a6d7298b0833614c411f774c46514efb1bd5651.tar.xz
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.c16
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 ");