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| author | Terry Bowman <terry.bowman@amd.com> | 2022-02-09 11:27:09 -0600 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2022-02-10 22:40:00 +0100 |
| commit | 27c196c7b73cb70bbed3a9df46563bab60e63415 (patch) | |
| tree | c8528d1bbf361e79d15c803bf1cfe91dfe49e331 /include/linux/ioport.h | |
| parent | e783362eb54cd99b2cac8b3a9aeac942e6f6ac07 (diff) | |
| download | linux-stable-27c196c7b73cb70bbed3a9df46563bab60e63415.tar.gz linux-stable-27c196c7b73cb70bbed3a9df46563bab60e63415.tar.bz2 linux-stable-27c196c7b73cb70bbed3a9df46563bab60e63415.zip | |
kernel/resource: Introduce request_mem_region_muxed()
Support for requesting muxed memory region is implemented but not
currently callable as a macro. Add the request muxed memory
region macro.
MMIO memory accesses can be synchronized using request_mem_region() which
is already available. This call will return failure if the resource is
busy. The 'muxed' version of this macro will handle a busy resource by
using a wait queue to retry until the resource is available.
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'include/linux/ioport.h')
| -rw-r--r-- | include/linux/ioport.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 8359c50f9988..ec5f71f7135b 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -262,6 +262,8 @@ resource_union(struct resource *r1, struct resource *r2, struct resource *r) #define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED) #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl) #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0) +#define request_mem_region_muxed(start, n, name) \ + __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_MUXED) #define request_mem_region_exclusive(start,n,name) \ __request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE) #define rename_region(region, newname) do { (region)->name = (newname); } while (0) |