[PATCH] mpic: add support for serial mode interrupts
From: Mark A. Greer <hidden>
Date: 2006-06-19 20:08:11
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
MPC10x-style interrupt controllers have a serial mode that allows several interrupts to be clocked in through one INT signal. This patch adds the software support for that mode. Signed-off-by: Mark A. Greer <redacted> -- arch/powerpc/sysdev/mpic.c | 6 ++++++ include/asm-powerpc/mpic.h | 2 ++ 2 files changed, 8 insertions(+) --
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 7dcdfcb..1829aed 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c@@ -629,6 +629,12 @@ #endif /* CONFIG_SMP */ mb(); } + /* For serial interrupts & set clock ratio */ + if (flags & MPIC_SERIAL_MODE) + mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, + mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1) + | (1<<27) | (0x7<<28)); + /* Read feature register, calculate num CPUs and, for non-ISU * MPICs, num sources as well. On ISU MPICs, sources are counted * as ISUs are added
diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
index 6b9e781..f35ccdc 100644
--- a/include/asm-powerpc/mpic.h
+++ b/include/asm-powerpc/mpic.h@@ -186,6 +186,8 @@ #define MPIC_BROKEN_U3 0x00000004 #define MPIC_BROKEN_IPI 0x00000008 /* MPIC wants a reset */ #define MPIC_WANTS_RESET 0x00000010 +/* MPIC serial mode */ +#define MPIC_SERIAL_MODE 0x00000020 /* Allocate the controller structure and setup the linux irq descs * for the range if interrupts passed in. No HW initialization is