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| author | Rob Herring <rob.herring@calxeda.com> | 2012-02-29 18:10:58 -0600 |
|---|---|---|
| committer | Rob Herring <rob.herring@calxeda.com> | 2012-07-25 09:26:42 -0500 |
| commit | c2794437091a4fda72c4a4f3567dd728dcc0c3c9 (patch) | |
| tree | 56e4d414f5b78bdf35822b38af5be021711a0970 /arch/arm/kernel/bios32.c | |
| parent | 701eb2647d7986b42fa973990649a83b3e15e8eb (diff) | |
| download | op-kernel-dev-c2794437091a4fda72c4a4f3567dd728dcc0c3c9.zip op-kernel-dev-c2794437091a4fda72c4a4f3567dd728dcc0c3c9.tar.gz | |
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')
| -rw-r--r-- | arch/arm/kernel/bios32.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c index 2555250..c3165f0 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); +} |
