path: root/arch/arm/kernel/bios32.c
diff options
authorRob Herring <rob.herring@calxeda.com>2012-02-29 18:10:58 -0600
committerRob Herring <rob.herring@calxeda.com>2012-07-25 09:26:42 -0500
commitc2794437091a4fda72c4a4f3567dd728dcc0c3c9 (patch)
tree56e4d414f5b78bdf35822b38af5be021711a0970 /arch/arm/kernel/bios32.c
parent701eb2647d7986b42fa973990649a83b3e15e8eb (diff)
ARM: Add fixed PCI i/o mapping
This adds a fixed virtual mapping for PCI i/o addresses. The mapping is located at the last 2MB of vmalloc region (0xfee00000-0xff000000). 2MB is used to align with PMD size, but IO_SPACE_LIMIT is 1MB. The space is reserved after .map_io and can be mapped at any time later with pci_ioremap_io. Platforms which need early i/o mapping (e.g. for vga console) can call pci_map_io_early in their .map_io function. This has changed completely from the 1st implementation which only supported creating the static mapping at .map_io. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Cc: Russell King <linux@arm.linux.org.uk> Acked-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'arch/arm/kernel/bios32.c')
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index 25552508c3f..c3165f0fef6 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -13,6 +13,7 @@
#include <linux/io.h>
#include <asm/mach-types.h>
+#include <asm/mach/map.h>
#include <asm/mach/pci.h>
static int debug_pci;
@@ -627,3 +628,15 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
return 0;
+void __init pci_map_io_early(unsigned long pfn)
+ struct map_desc pci_io_desc = {
+ .virtual = PCI_IO_VIRT_BASE,
+ .type = MT_DEVICE,
+ .length = SZ_64K,
+ };
+ pci_io_desc.pfn = pfn;
+ iotable_init(&pci_io_desc, 1);