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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 /Documentation/arm | |
| parent | 701eb2647d7986b42fa973990649a83b3e15e8eb (diff) | |
| download | linux-c2794437091a4fda72c4a4f3567dd728dcc0c3c9.tar.gz linux-c2794437091a4fda72c4a4f3567dd728dcc0c3c9.tar.bz2 linux-c2794437091a4fda72c4a4f3567dd728dcc0c3c9.zip | |
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')
| -rw-r--r-- | Documentation/arm/memory.txt | 3 |
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. |