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authorJohannes Berg <johannes.berg@intel.com>2021-03-05 13:19:52 +0100
committerRichard Weinberger <richard@nod.at>2021-06-17 21:44:51 +0200
commitca2e334232b6cd4ae5af9da2df83c009d042aefb (patch)
tree1827fb3faf57865ec599ee74e574a2bfd6a45edd /lib/Kconfig
parent0bbadafdc49d11a1836e5946f517d18cceaea6c8 (diff)
downloadlinux-ca2e334232b6cd4ae5af9da2df83c009d042aefb.tar.bz2
lib: add iomem emulation (logic_iomem)
Add IO memory emulation that uses callbacks for read/write to the allocated regions. The callbacks can be registered by the users using logic_iomem_alloc(). To use, an architecture must 'select LOGIC_IOMEM' in Kconfig and then include <asm-generic/logic_io.h> into asm/io.h to get the __raw_read*/__raw_write* functions. Optionally, an architecture may 'select LOGIC_IOMEM_FALLBACK' in which case non-emulated regions will 'fall back' to the various real_* functions that must then be provided. Cc: Arnd Bergmann <arnd@kernel.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'lib/Kconfig')
-rw-r--r--lib/Kconfig14
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index ac3b30697b2b..d241fe476fda 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -102,6 +102,20 @@ config INDIRECT_PIO
When in doubt, say N.
+config INDIRECT_IOMEM
+ bool
+ help
+ This is selected by other options/architectures to provide the
+ emulated iomem accessors.
+
+config INDIRECT_IOMEM_FALLBACK
+ bool
+ depends on INDIRECT_IOMEM
+ help
+ If INDIRECT_IOMEM is selected, this enables falling back to plain
+ mmio accesses when the IO memory address is not a registered
+ emulated region.
+
config CRC_CCITT
tristate "CRC-CCITT functions"
help