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authorDavid Howells <dhowells@redhat.com>2010-01-08 14:43:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-11 09:34:10 -0800
commit112b4a0bf1080b3d40a2d3b3982361229b25e72d (patch)
treee9b49ac3df442cc469b0823378961d4d46b88bc5 /arch/mn10300/unit-asb2305
parent126cda50468d26c4c67f20c51a800685d42d1c61 (diff)
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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>
Diffstat (limited to 'arch/mn10300/unit-asb2305')
-rw-r--r--arch/mn10300/unit-asb2305/pci.c57
1 files changed, 35 insertions, 22 deletions
diff --git a/arch/mn10300/unit-asb2305/pci.c b/arch/mn10300/unit-asb2305/pci.c
index 02527ce..2cb7e75 100644
--- a/arch/mn10300/unit-asb2305/pci.c
+++ b/arch/mn10300/unit-asb2305/pci.c
@@ -27,6 +27,29 @@ 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;
}