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>

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 ");