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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: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2010-01-08 14:43:20 -08:00 committed by Linus Torvalds
parent 126cda5046
commit 112b4a0bf1
1 changed files with 35 additions and 22 deletions
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57
arch/mn10300/unit-asb2305/pci.c
View File

@ -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
}
pci_root_bus = pci_scan_bus(0, &pci_direct_ampci, NULL);
pcibios_irq_init();
pcibios_fixup_irqs();
#if 0
pcibios_resource_survey();
#endif
return 0;
}