ARM: footbridge: use GENERIC_IRQ_MULTI_HANDLER

Footbridge still uses the classic IRQ entry path in assembler,
but this is easily converted into an equivalent C version.

In this case, the correlation between IRQ numbers and bits in
the status register is non-obvious, and the priorities are
handled by manually checking each bit in a static order,
re-reading the status register after each handled event.

I moved the code into the new file and edited the syntax without
changing this sequence to keep the behavior as close as possible
to what it traditionally did.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 25f1868e5703..a0cc9ca66ae0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -362,6 +362,7 @@ config ARCH_FOOTBRIDGE
 	select FOOTBRIDGE
 	select NEED_MACH_IO_H if !MMU
 	select NEED_MACH_MEMORY_H
+	select GENERIC_IRQ_MULTI_HANDLER
 	help
 	  Support for systems based on the DC21285 companion chip
 	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.