ARM: move PCI i/o resource setup into common code

With consolidation of the PCI i/o mappings, the i/o space is being
set to start at a PCI bus addr of 0x0 and fixed to 64K per bus. In
this case the core ARM PCI setup code can setup the i/o resource.

Currently, the resource is only setup if the platform did not setup
an i/o resource.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/include/asm/mach/pci.h

@@ -11,6 +11,7 @@
 #ifndef __ASM_MACH_PCI_H
 #define __ASM_MACH_PCI_H
 
+#include <linux/ioport.h>
 
 struct pci_sys_data;
 struct pci_ops;
@@ -43,6 +44,8 @@ struct pci_sys_data {
 	unsigned long	io_offset;	/* bus->cpu IO mapping offset		*/
 	struct pci_bus	*bus;		/* PCI bus				*/
 	struct list_head resources;	/* root bus resources (apertures)       */
+	struct resource io_res;
+	char		io_res_name[12];
 					/* Bridge swizzling			*/
 	u8		(*swizzle)(struct pci_dev *, u8 *);
 					/* IRQ mapping				*/

arch/arm/kernel/bios32.c

@@ -424,6 +424,38 @@ static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 	return irq;
 }
 
+static int __init pcibios_init_resources(int busnr, struct pci_sys_data *sys)
+{
+	int ret;
+	struct pci_host_bridge_window *window;
+
+	if (list_empty(&sys->resources)) {
+		pci_add_resource_offset(&sys->resources,
+			 &iomem_resource, sys->mem_offset);
+	}
+
+	list_for_each_entry(window, &sys->resources, list) {
+		if (resource_type(window->res) == IORESOURCE_IO)
+			return 0;
+	}
+
+	sys->io_res.start = (busnr * SZ_64K) ?  : pcibios_min_io;
+	sys->io_res.end = (busnr + 1) * SZ_64K - 1;
+	sys->io_res.flags = IORESOURCE_IO;
+	sys->io_res.name = sys->io_res_name;
+	sprintf(sys->io_res_name, "PCI%d I/O", busnr);
+
+	ret = request_resource(&ioport_resource, &sys->io_res);
+	if (ret) {
+		pr_err("PCI: unable to allocate I/O port region (%d)\n", ret);
+		return ret;
+	}
+	pci_add_resource_offset(&sys->resources, &sys->io_res,
+				sys->io_offset);
+
+	return 0;
+}
+
 static void __init pcibios_init_hw(struct hw_pci *hw, struct list_head *head)
 {
 	struct pci_sys_data *sys = NULL;
@@ -446,11 +478,10 @@ static void __init pcibios_init_hw(struct hw_pci *hw, struct list_head *head)
 		ret = hw->setup(nr, sys);
 
 		if (ret > 0) {
-			if (list_empty(&sys->resources)) {
-				pci_add_resource_offset(&sys->resources,
-					 &ioport_resource, sys->io_offset);
-				pci_add_resource_offset(&sys->resources,
-					 &iomem_resource, sys->mem_offset);
+			ret = pcibios_init_resources(nr, sys);
+			if (ret)  {
+				kfree(sys);
+				break;
 			}
 
 			if (hw->scan)