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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 /Documentation/arm/memory.txt
parent701eb2647d7986b42fa973990649a83b3e15e8eb (diff)
downloadlinux-c2794437091a4fda72c4a4f3567dd728dcc0c3c9.tar.bz2
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 'Documentation/arm/memory.txt')
-rw-r--r--Documentation/arm/memory.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/arm/memory.txt b/Documentation/arm/memory.txt
index 208a2d465b92..4bfb9ffbdbc1 100644
--- a/Documentation/arm/memory.txt
+++ b/Documentation/arm/memory.txt
@@ -51,6 +51,9 @@ ffc00000 ffefffff DMA memory mapping region. Memory returned
ff000000 ffbfffff Reserved for future expansion of DMA
mapping region.
+fee00000 feffffff Mapping of PCI I/O space. This is a static
+ mapping within the vmalloc space.
+
VMALLOC_START VMALLOC_END-1 vmalloc() / ioremap() space.
Memory returned by vmalloc/ioremap will
be dynamically placed in this region.