diff options
| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2023-03-23 17:33:52 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2023-04-05 22:15:19 +0200 |
| commit | fcbfe8121a45152a3cfbe1c28c96a3b611b7347d (patch) | |
| tree | 3f1e4c0bd1979e56e9438396bea7686466c59dfe /lib | |
| parent | fe15c26ee26efa11741a7b632e9f23b01aca4cc6 (diff) | |
Kconfig: introduce HAS_IOPORT option and select it as necessary
We introduce a new HAS_IOPORT Kconfig option to indicate support for I/O
Port access. In a future patch HAS_IOPORT=n will disable compilation of
the I/O accessor functions inb()/outb() and friends on architectures
which can not meaningfully support legacy I/O spaces such as s390.
The following architectures do not select HAS_IOPORT:
* ARC
* C-SKY
* Hexagon
* Nios II
* OpenRISC
* s390
* User-Mode Linux
* Xtensa
All other architectures select HAS_IOPORT at least conditionally.
The "depends on" relations on HAS_IOPORT in drivers as well as ifdefs
for HAS_IOPORT specific sections will be added in subsequent patches on
a per subsystem basis.
Co-developed-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net> # for ARCH=um
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig index ce2abffb9ed8..5c2da561c516 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -92,6 +92,7 @@ config ARCH_USE_SYM_ANNOTATIONS config INDIRECT_PIO bool "Access I/O in non-MMIO mode" depends on ARM64 + depends on HAS_IOPORT help On some platforms where no separate I/O space exists, there are I/O hosts which can not be accessed in MMIO mode. Using the logical PIO @@ -509,6 +510,9 @@ config HAS_IOMEM depends on !NO_IOMEM default y +config HAS_IOPORT + bool + config HAS_IOPORT_MAP bool depends on HAS_IOMEM && !NO_IOPORT_MAP |