[ARM] 3946/1: AT91: at91_arch_reset and at91_extern_irq

The external interrupt sources are different on the various AT91
processors.  This patch introduces the global 'at91_extern_irq' variable
that contains a bitset of the available external interrupt sources.

The processor reset mechanism also differs on the various AT91
processors.  This patch also adds a global 'at91_arch_reset' callback
(from system.h) into the processor-specific code to perform the reset.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 10 insertions, 4 deletions

diff --git a/arch/arm/mach-at91rm9200/irq.c b/arch/arm/mach-at91rm9200/irq.c
index 3e488117ca91..2cea07a34a85 100644
--- a/arch/arm/mach-at91rm9200/irq.c
+++ b/arch/arm/mach-at91rm9200/irq.c
@@ -47,6 +47,10 @@ static void at91_aic_unmask_irq(unsigned int irq)
         at91_sys_write(AT91_AIC_IECR, 1 << irq);
 }
 
+unsigned int at91_extern_irq;
+
+#define is_extern_irq(irq) ((1 << (irq)) & at91_extern_irq)
+
 static int at91_aic_set_type(unsigned irq, unsigned type)
 {
         unsigned int smr, srctype;
@@ -59,14 +63,16 @@ static int at91_aic_set_type(unsigned irq, unsigned type)
                 srctype = AT91_AIC_SRCTYPE_RISING;
                 break;
         case IRQT_LOW:
-                if ((irq > AT91_ID_FIQ) && (irq < AT91RM9200_ID_IRQ0))  /* only supported on external interrupts */
+                if ((irq == AT91_ID_FIQ) || is_extern_irq(irq))         /* only supported on external interrupts */
+                        srctype = AT91_AIC_SRCTYPE_LOW;
+                else
                         return -EINVAL;
-                srctype = AT91_AIC_SRCTYPE_LOW;
                 break;
         case IRQT_FALLING:
-                if ((irq > AT91_ID_FIQ) && (irq < AT91RM9200_ID_IRQ0))  /* only supported on external interrupts */
+                if ((irq == AT91_ID_FIQ) || is_extern_irq(irq))         /* only supported on external interrupts */
+                        srctype = AT91_AIC_SRCTYPE_FALLING;
+                else
                         return -EINVAL;
-                srctype = AT91_AIC_SRCTYPE_FALLING;
                 break;
         default:
                 return -EINVAL;