Commit 112b4a0b authored by David Howells's avatar David Howells Committed by Linus Torvalds
Browse files

mn10300: insert PCI root bus resources for the ASB2305 devel motherboard 



Insert PCI root bus resources for the MN10300-based ASB2305 development
kit motherboard.  This is required because the CPU's window onto the PCI
bus address space is considerably smaller than the CPU's full address
space and non-PCI devices lie outside of the PCI window that we might want
to access.

Without this patch, the PCI root bus uses the platform-level bus
resources, and these are then confined to the PCI window, thus making
platform_device_add() reject devices outside of this window.

We also add a reservation for the PCI SRAM region.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 126cda50

arch/mn10300/unit-asb2305/pci.c

+35 −22
Original line number Diff line number Diff line
@@ -26,6 +26,29 @@ int pcibios_last_bus = -1; 
struct pci_bus *pci_root_bus;

struct pci_ops *pci_root_ops;



/*

 * The accessible PCI window does not cover the entire CPU address space, but

 * there are devices we want to access outside of that window, so we need to

 * insert specific PCI bus resources instead of using the platform-level bus

 * resources directly for the PCI root bus.

 *

 * These are configured and inserted by pcibios_init() and are attached to the

 * root bus by pcibios_fixup_bus().

 */

static struct resource pci_ioport_resource = {

	.name	= "PCI IO",

	.start	= 0xbe000000,

	.end	= 0xbe03ffff,

	.flags	= IORESOURCE_IO,

};



static struct resource pci_iomem_resource = {

	.name	= "PCI mem",

	.start	= 0xb8000000,

	.end	= 0xbbffffff,

	.flags	= IORESOURCE_MEM,

};



/*

 * Functions for accessing PCI configuration space

 */
@@ -297,6 +320,7 @@ static int __init pci_check_direct(void) 
		printk(KERN_INFO "PCI: Using configuration ampci\n");

		request_mem_region(0xBE040000, 256, "AMPCI bridge");

		request_mem_region(0xBFFFFFF4, 12, "PCI ampci");

		request_mem_region(0xBC000000, 32 * 1024 * 1024, "PCI SRAM");

		return 0;

	}
@@ -358,6 +382,11 @@ void __devinit pcibios_fixup_bus(struct pci_bus *bus) 
{

	struct pci_dev *dev;



	if (bus->number == 0) {

		bus->resource[0] = &pci_ioport_resource;

		bus->resource[1] = &pci_iomem_resource;

	}



	if (bus->self) {

		pci_read_bridge_bases(bus);

		pcibios_fixup_device_resources(bus->self);
@@ -380,6 +409,11 @@ static int __init pcibios_init(void) 
	iomem_resource.start	= 0xA0000000;

	iomem_resource.end	= 0xDFFFFFFF;



	if (insert_resource(&iomem_resource, &pci_iomem_resource) < 0)

		panic("Unable to insert PCI IOMEM resource\n");

	if (insert_resource(&ioport_resource, &pci_ioport_resource) < 0)

		panic("Unable to insert PCI IOPORT resource\n");



	if (!pci_probe)

		return 0;
@@ -391,32 +425,11 @@ static int __init pcibios_init(void) 
	printk(KERN_INFO "PCI: Probing PCI hardware [mempage %08x]\n",

	       MEM_PAGING_REG);



	{

#if 0

		static struct pci_bus am33_root_bus = {

			.children  = LIST_HEAD_INIT(am33_root_bus.children),

			.devices   = LIST_HEAD_INIT(am33_root_bus.devices),

			.number    = 0,

			.secondary = 0,

			.resource = { &ioport_resource, &iomem_resource },

		};



		am33_root_bus.ops = pci_root_ops;

		list_add_tail(&am33_root_bus.node, &pci_root_buses);



		am33_root_bus.subordinate = pci_do_scan_bus(0);



		pci_root_bus = &am33_root_bus;

#else

	pci_root_bus = pci_scan_bus(0, &pci_direct_ampci, NULL);

#endif

	}



	pcibios_irq_init();

	pcibios_fixup_irqs();

#if 0

	pcibios_resource_survey();

#endif

	return 0;

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE