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| author | Hector Martin <marcan@marcan.st> | 2021-02-11 21:35:46 +0900 |
|---|---|---|
| committer | Hector Martin <marcan@marcan.st> | 2021-04-08 20:18:38 +0900 |
| commit | 7c566bb5e4d5fb0d89579a90d8a1f54eaff6f95d (patch) | |
| tree | 519bfa88511fb25c1c7a7590a60740985045675c /include/linux/ioport.h | |
| parent | 86332e9e3477af8f31c9d5f3e81e57e0fd2118e7 (diff) | |
| download | lwn-7c566bb5e4d5fb0d89579a90d8a1f54eaff6f95d.tar.gz lwn-7c566bb5e4d5fb0d89579a90d8a1f54eaff6f95d.zip | |
asm-generic/io.h: Add a non-posted variant of ioremap()
ARM64 currently defaults to posted MMIO (nGnRE), but some devices
require the use of non-posted MMIO (nGnRnE). Introduce a new ioremap()
variant to handle this case. ioremap_np() returns NULL on arches that
do not implement this variant.
sparc64 is the only architecture that needs to be touched directly,
because it includes neither of the generic io.h or iomap.h headers.
This adds the IORESOURCE_MEM_NONPOSTED flag, which maps to this
variant and marks a given resource as requiring non-posted mappings.
This is implemented in the resource system because it is a SoC-level
requirement, so existing drivers do not need special-case code to pick
this ioremap variant.
Then this is implemented in devres by introducing devm_ioremap_np(),
and making devm_ioremap_resource() automatically select this variant
when the resource has the IORESOURCE_MEM_NONPOSTED flag set.
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Hector Martin <marcan@marcan.st>
Diffstat (limited to 'include/linux/ioport.h')
| -rw-r--r-- | include/linux/ioport.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 55de385c839c..1de6c2e40c32 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -108,6 +108,7 @@ struct resource { #define IORESOURCE_MEM_32BIT (3<<3) #define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */ #define IORESOURCE_MEM_EXPANSIONROM (1<<6) +#define IORESOURCE_MEM_NONPOSTED (1<<7) /* PnP I/O specific bits (IORESOURCE_BITS) */ #define IORESOURCE_IO_16BIT_ADDR (1<<0) |