irqchip/jcore-aic: Add J-Core AIC driver

There are two versions of the J-Core interrupt controller in use, aic1
which generates interrupts with programmable priorities, but only
supports 8 irq lines and maps them to cpu traps in the range 17 to 24,
and aic2 which uses traps in the range 64-127 and supports up to 128
irqs, with priorities dependent on the interrupt number. The Linux
driver does not make use of priorities anyway.

For simplicity, there is no aic1-specific logic in the driver beyond
setting the priority register, which is necessary for interrupts to
work at all. Eventually aic1 will likely be phased out, but it's
currently in use in deployments and all released bitstream binaries.

Signed-off-by: Rich Felker <dalias@libc.org>
Link: https://lkml.kernel.org/r/c3b89ef74aaa6477575dbe2d410eb1d182503243.147018b6529.git.dalias@libc.org
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 7f8728984f44..43bed4e5c7ae 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -156,6 +156,13 @@ config PIC32_EVIC
         select GENERIC_IRQ_CHIP
         select IRQ_DOMAIN
 
+config JCORE_AIC
+        bool "J-Core integrated AIC"
+        depends on OF && (SUPERH || COMPILE_TEST)
+        select IRQ_DOMAIN
+        help
+          Support for the J-Core integrated AIC.
+
 config RENESAS_INTC_IRQPIN
         bool
         select IRQ_DOMAIN