powerpc/iseries: Fix pci breakage due to bad dma_data initialization

Commit 4fc665b88a79a45bae8bbf3a05563c27c7337c3d "powerpc: Merge 32 and
64-bit dma code" made changes to the PCI initialisation code that added
an assignment to archdata.dma_data but only for 32 bit code.  Commit
7eef440a545c7f812ed10b49d4a10a351df9cad6 "powerpc/pci: Cosmetic cleanups
of pci-common.c" removed the conditional compilation.  Unfortunately,
the iSeries code setup the archdata.dma_data before that assignment was
done - effectively overwriting the dma_data with NULL.

Fix this up by moving the iSeries setup of dma_data into a
pci_dma_dev_setup callback.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/iseries/iommu.h

@@ -26,10 +26,6 @@ struct vio_dev;
 struct device_node;
 struct iommu_table;
 
-/* Creates table for an individual device node */
-extern void iommu_devnode_init_iSeries(struct pci_dev *pdev,
-				       struct device_node *dn);
-
 /* Get table parameters from HV */
 extern void iommu_table_getparms_iSeries(unsigned long busno,
 		unsigned char slotno, unsigned char virtbus,

arch/powerpc/platforms/iseries/iommu.c

@@ -174,9 +174,10 @@ static struct iommu_table *iommu_table_find(struct iommu_table * tbl)
 }
 
 
-void iommu_devnode_init_iSeries(struct pci_dev *pdev, struct device_node *dn)
+static void pci_dma_dev_setup_iseries(struct pci_dev *pdev)
 {
 	struct iommu_table *tbl;
+	struct device_node *dn = pdev->sysdata;
 	struct pci_dn *pdn = PCI_DN(dn);
 	const u32 *lsn = of_get_property(dn, "linux,logical-slot-number", NULL);
 
@@ -194,6 +195,8 @@ void iommu_devnode_init_iSeries(struct pci_dev *pdev, struct device_node *dn)
 		kfree(tbl);
 	pdev->dev.archdata.dma_data = pdn->iommu_table;
 }
+#else
+#define pci_dma_dev_setup_iseries	NULL
 #endif
 
 static struct iommu_table veth_iommu_table;
@@ -251,5 +254,6 @@ void iommu_init_early_iSeries(void)
 	ppc_md.tce_build = tce_build_iSeries;
 	ppc_md.tce_free  = tce_free_iSeries;
 
+	ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_iseries;
 	set_pci_dma_ops(&dma_iommu_ops);
 }

arch/powerpc/platforms/iseries/pci.c

@@ -444,7 +444,6 @@ void __init iSeries_pcibios_fixup_resources(struct pci_dev *pdev)
 	pdev->sysdata = node;
 	allocate_device_bars(pdev);
 	iseries_device_information(pdev, bus, *sub_bus);
-	iommu_devnode_init_iSeries(pdev, node);
 }
 
 /*