[PATCH 2/3] powerpc/pci: add dma_set_mask to pci_controller_ops

[Daniel Axtens <dja@axtens.net>]

Some systems only need to deal with DMA masks for PCI devices.
For these systems, we can avoid the need for a platform hook and
instead use a pci controller based hook.

Signed-off-by: Daniel Axtens <dja@axtens.net>
---
 arch/powerpc/include/asm/pci-bridge.h |  2 ++
 arch/powerpc/kernel/dma.c             | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index a3b6252..6d17bb8 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -36,6 +36,8 @@ struct pci_controller_ops {
 					  int nvec, int type);
 	void		(*teardown_msi_irqs)(struct pci_dev *dev);
 #endif
+
+	int             (*dma_set_mask)(struct pci_dev *dev, u64 dma_mask);
 };
 
 /*
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 484b2d4..1acf19c 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -246,8 +246,19 @@ int __dma_set_mask(struct device *dev, u64 dma_mask)
 
 int dma_set_mask(struct device *dev, u64 dma_mask)
 {
+	struct pci_dev *pdev;
+	struct pci_controller *phb;
+	
 	if (ppc_md.dma_set_mask)
 		return ppc_md.dma_set_mask(dev, dma_mask);
+
+	if (dev_is_pci(dev)) {
+		pdev = to_pci_dev(dev);
+		phb = pci_bus_to_host(pdev->bus);
+		if (phb->controller_ops.dma_set_mask)
+			return phb->controller_ops.dma_set_mask(pdev, dma_mask);
+	}
+
 	return __dma_set_mask(dev, dma_mask);
 }
 EXPORT_SYMBOL(dma_set_mask);
-- 
2.1.4