diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2021-03-05 13:19:52 +0100 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2021-06-17 21:44:51 +0200 |
| commit | ca2e334232b6cd4ae5af9da2df83c009d042aefb (patch) | |
| tree | 1827fb3faf57865ec599ee74e574a2bfd6a45edd /lib/Kconfig | |
| parent | um: allow disabling NO_IOMEM (diff) | |
| download | linux-ca2e334232b6cd4ae5af9da2df83c009d042aefb.tar.xz linux-ca2e334232b6cd4ae5af9da2df83c009d042aefb.zip | |
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/Kconfig | 14 |
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 |