[ARM] Orion: add a separate BRIDGE_INT_TIMER1_CLR define

Some Feroceon-based SoCs have an MBUS bridge interrupt controller
that requires writing a one instead of a zero to clear edge
interrupt sources such as timer expiry.

This patch adds a new BRIDGE_INT_TIMER1_CLR define, which platform
code can set to either ~BRIDGE_INT_TIMER1 (write-zero-to-clear) or
BRIDGE_INT_TIMER1 (write-one-to-clear) depending on the platform.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>

2 files changed, 4 insertions, 3 deletions

diff --git a/arch/arm/plat-orion/time.c b/arch/arm/plat-orion/time.c
index 28b5285446e8..93c4ef9f0067 100644
--- a/arch/arm/plat-orion/time.c
+++ b/arch/arm/plat-orion/time.c
@@ -74,7 +74,7 @@ orion_clkevt_next_event(unsigned long delta, struct clock_event_device *dev)
         /*
          * Clear and enable clockevent timer interrupt.
          */
-        writel(~BRIDGE_INT_TIMER1, BRIDGE_CAUSE);
+        writel(BRIDGE_INT_TIMER1_CLR, BRIDGE_CAUSE);
 
         u = readl(BRIDGE_MASK);
         u |= BRIDGE_INT_TIMER1;
@@ -138,7 +138,7 @@ orion_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
                 /*
                  * ACK pending timer interrupt.
                  */
-                writel(~BRIDGE_INT_TIMER1, BRIDGE_CAUSE);
+                writel(BRIDGE_INT_TIMER1_CLR, BRIDGE_CAUSE);
 
         }
         local_irq_restore(flags);
@@ -159,7 +159,7 @@ static irqreturn_t orion_timer_interrupt(int irq, void *dev_id)
         /*
          * ACK timer interrupt and call event handler.
          */
-        writel(~BRIDGE_INT_TIMER1, BRIDGE_CAUSE);
+        writel(BRIDGE_INT_TIMER1_CLR, BRIDGE_CAUSE);
         orion_clkevt.event_handler(&orion_clkevt);
 
         return IRQ_HANDLED;
diff --git a/include/asm-arm/arch-orion5x/orion5x.h b/include/asm-arm/arch-orion5x/orion5x.h
index 20f7b406a798..10257f5c5e9e 100644
--- a/include/asm-arm/arch-orion5x/orion5x.h
+++ b/include/asm-arm/arch-orion5x/orion5x.h
@@ -154,6 +154,7 @@
 #define BRIDGE_MASK             ORION5X_BRIDGE_REG(0x114)
 #define  BRIDGE_INT_TIMER0      0x0002
 #define  BRIDGE_INT_TIMER1      0x0004
+#define  BRIDGE_INT_TIMER1_CLR  (~0x0004)
 #define MAIN_IRQ_CAUSE          ORION5X_BRIDGE_REG(0x200)
 #define MAIN_IRQ_MASK           ORION5X_BRIDGE_REG(0x204)