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PCI: Update DMA configuration from DT

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If there is a DT node available for the root bridge's parent device, use
the DMA configuration from that device node.  For example, Keystone PCI
devices would require dma_pfn_offset to be set correctly in the device
structure of the PCI device in order to have the correct DMA mask.  The DT
node will have dma-ranges defined for this.  Also support using the DT
property dma-coherent to allow coherent DMA operation by the PCI device.

Use the new helper function of_pci_dma_configure() to update the device DMA
configuration.  This fixes DMA on systems where DMA addresses are a
constant offset from CPU physical addresses.

Tested-by: Suravee Suthikulpanit <[email protected]> (AMD Seattle)
Signed-off-by: Murali Karicheri <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Catalin Marinas <[email protected]>
Acked-by: Will Deacon <[email protected]>
CC: Joerg Roedel <[email protected]>
CC: Grant Likely <[email protected]>
CC: Rob Herring <[email protected]>
CC: Russell King <[email protected]>
CC: Arnd Bergmann <[email protected]>
This commit is contained in:
Murali Karicheri 2015-03-03 12:52:13 -05:00 • committed by Bjorn Helgaas
commit de335bb492
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/probe.c
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@ -6,6 +6,7 @@
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/of_pci.h>
#include <linux/pci_hotplug.h>
#include <linux/slab.h>
#include <linux/module.h>
@ -1520,6 +1521,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
dev->dev.dma_mask = &dev->dma_mask;
dev->dev.dma_parms = &dev->dma_parms;
dev->dev.coherent_dma_mask = 0xffffffffull;
of_pci_dma_configure(dev);
pci_set_dma_max_seg_size(dev, 65536);
pci_set_dma_seg_boundary(dev, 0xffffffff);