ARM: rpc: make default fiq handler run-time installed

Only rpc uses disable_fiq macro. Change it to a run-time installed
default FIQ handler. The handler is installed before FIQ is enabled
so the behavior should be unchanged.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Acked-by: Nicolas Pitre <nico@linaro.org>

3 files changed, 23 insertions, 1 deletions

diff --git a/arch/arm/mach-rpc/Makefile b/arch/arm/mach-rpc/Makefile
index aa77bc9efbbb..dfa405c0cfde 100644
--- a/arch/arm/mach-rpc/Makefile
+++ b/arch/arm/mach-rpc/Makefile
@@ -4,7 +4,7 @@
 
 # Object file lists.
 
-obj-y                   := dma.o irq.o riscpc.o
+obj-y                   := dma.o fiq.o irq.o riscpc.o
 obj-m                   :=
 obj-n                   :=
 obj-                    :=
diff --git a/arch/arm/mach-rpc/fiq.S b/arch/arm/mach-rpc/fiq.S
new file mode 100644
index 000000000000..48ddd57db16e
--- /dev/null
+++ b/arch/arm/mach-rpc/fiq.S
@@ -0,0 +1,16 @@
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <mach/hardware.h>
+#include <mach/entry-macro.S>
+
+        .text
+
+        .global rpc_default_fiq_end
+ENTRY(rpc_default_fiq_start)
+        mov     r12, #ioc_base_high
+        .if     ioc_base_low
+        orr     r12, r12, #ioc_base_low
+        .endif
+        strb    r12, [r12, #0x38]       @ Disable FIQ register
+        subs    pc, lr, #4
+rpc_default_fiq_end:
diff --git a/arch/arm/mach-rpc/irq.c b/arch/arm/mach-rpc/irq.c
index 2e1b5309fbab..cf0e669eaf1a 100644
--- a/arch/arm/mach-rpc/irq.c
+++ b/arch/arm/mach-rpc/irq.c
@@ -5,6 +5,7 @@
 #include <asm/mach/irq.h>
 #include <asm/hardware/iomd.h>
 #include <asm/irq.h>
+#include <asm/fiq.h>
 
 static void iomd_ack_irq_a(struct irq_data *d)
 {
@@ -112,6 +113,8 @@ static struct irq_chip iomd_fiq_chip = {
         .irq_unmask     = iomd_unmask_irq_fiq,
 };
 
+extern unsigned char rpc_default_fiq_start, rpc_default_fiq_end;
+
 void __init rpc_init_irq(void)
 {
         unsigned int irq, flags;
@@ -121,6 +124,9 @@ void __init rpc_init_irq(void)
         iomd_writeb(0, IOMD_FIQMASK);
         iomd_writeb(0, IOMD_DMAMASK);
 
+        set_fiq_handler(&rpc_default_fiq_start,
+                &rpc_default_fiq_end - &rpc_default_fiq_start);
+
         for (irq = 0; irq < NR_IRQS; irq++) {
                 flags = IRQF_VALID;