sh/PCI: Pass GAPSPCI_DMA_BASE CPU & bus address to dma_declare_coherent_memory()

dma_declare_coherent_memory() needs both the CPU physical address and the
bus address of the device memory. They are the same on this platform, but
in general we should use pcibios_resource_to_bus() to account for any
address translation done by the PCI host bridge.

This makes no difference on Dreamcast, but is safer if the usage is copied
to future drivers.

Signed-off-by: Bjorn Helgaas <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
CC: Magnus Damm <[e-mail]>
CC: [e-mail]

arch/sh/drivers/pci/fixups-dreamcast.c

···
 static void gapspci_fixup_resources(struct pci_dev *dev)
 {
 	struct pci_channel *p = dev->sysdata;
+	struct resource res;
+	struct pci_bus_region region;
 
 	printk(KERN_NOTICE "PCI: Fixing up device %s\n", pci_name(dev));
 
···
 
 		/*
 		 * Redirect dma memory allocations to special memory window.
+		 *
+		 * If this GAPSPCI region were mapped by a BAR, the CPU
+		 * phys_addr_t would be pci_resource_start(), and the bus
+		 * address would be pci_bus_address(pci_resource_start()).
+		 * But apparently there's no BAR mapping it, so we just
+		 * "know" its CPU address is GAPSPCI_DMA_BASE.
 		 */
+		res.start = GAPSPCI_DMA_BASE;
+		res.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1;
+		res.flags = IORESOURCE_MEM;
+		pcibios_resource_to_bus(dev->bus, &region, &res);
 		BUG_ON(!dma_declare_coherent_memory(&dev->dev,
-						GAPSPCI_DMA_BASE,
-						GAPSPCI_DMA_BASE,
-						GAPSPCI_DMA_SIZE,
+						res.start,
+						region.start,
+						resource_size(&res),
 						DMA_MEMORY_MAP |
 						DMA_MEMORY_EXCLUSIVE));
 		break;