powerpc/dma: move pci_dma_dev_setup_swiotlb to fsl_pci.c

pci_dma_dev_setup_swiotlb is only used by the fsl_pci code, and closely
related to it, so fsl_pci.c seems like a better place for it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/swiotlb.h

@@ -18,8 +18,6 @@ extern const struct dma_map_ops powerpc_swiotlb_dma_ops;
 extern unsigned int ppc_swiotlb_enable;
 int __init swiotlb_setup_bus_notifier(void);
 
-extern void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev);
-
 #ifdef CONFIG_SWIOTLB
 void swiotlb_detect_4g(void);
 #else

arch/powerpc/kernel/dma-swiotlb.c

@@ -62,17 +62,6 @@ const struct dma_map_ops powerpc_swiotlb_dma_ops = {
 	.get_required_mask = swiotlb_powerpc_get_required,
 };
 
-void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
-{
-	struct pci_controller *hose;
-	struct dev_archdata *sd;
-
-	hose = pci_bus_to_host(pdev->bus);
-	sd = &pdev->dev.archdata;
-	sd->max_direct_dma_addr =
-		hose->dma_window_base_cur + hose->dma_window_size;
-}
-
 static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
 				  unsigned long action, void *data)
 {

arch/powerpc/sysdev/fsl_pci.c

@@ -114,6 +114,15 @@ static struct pci_ops fsl_indirect_pcie_ops =
 static u64 pci64_dma_offset;
 
 #ifdef CONFIG_SWIOTLB
+static void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
+{
+	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+	struct dev_archdata *sd = &pdev->dev.archdata;
+
+	sd->max_direct_dma_addr =
+		hose->dma_window_base_cur + hose->dma_window_size;
+}
+
 static void setup_swiotlb_ops(struct pci_controller *hose)
 {
 	if (ppc_swiotlb_enable) {