MIPS: ath79: simplify MISC IRQ handling

The current code uses multiple if statements for
demultiplexing the different interrupt sources.
Additionally, the MISC interrupt controller has
32 interrupt sources and the current code does not
handles all of them.

Get rid of the if statements and process all interrupt
sources in a loop to fix these issues.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4874/
Signed-off-by: John Crispin <blogic@openwrt.org>

2 files changed, 10 insertions, 36 deletions

diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c
index 90d09fc15398..219cfa1f5961 100644
--- a/arch/mips/ath79/irq.c
+++ b/arch/mips/ath79/irq.c
@@ -35,44 +35,17 @@ static void ath79_misc_irq_handler(unsigned int irq, struct irq_desc *desc)
         pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
                   __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 
-        if (pending & MISC_INT_UART)
-                generic_handle_irq(ATH79_MISC_IRQ_UART);
-
-        else if (pending & MISC_INT_DMA)
-                generic_handle_irq(ATH79_MISC_IRQ_DMA);
-
-        else if (pending & MISC_INT_PERFC)
-                generic_handle_irq(ATH79_MISC_IRQ_PERFC);
-
-        else if (pending & MISC_INT_TIMER)
-                generic_handle_irq(ATH79_MISC_IRQ_TIMER);
-
-        else if (pending & MISC_INT_TIMER2)
-                generic_handle_irq(ATH79_MISC_IRQ_TIMER2);
-
-        else if (pending & MISC_INT_TIMER3)
-                generic_handle_irq(ATH79_MISC_IRQ_TIMER3);
-
-        else if (pending & MISC_INT_TIMER4)
-                generic_handle_irq(ATH79_MISC_IRQ_TIMER4);
-
-        else if (pending & MISC_INT_OHCI)
-                generic_handle_irq(ATH79_MISC_IRQ_OHCI);
-
-        else if (pending & MISC_INT_ERROR)
-                generic_handle_irq(ATH79_MISC_IRQ_ERROR);
-
-        else if (pending & MISC_INT_GPIO)
-                generic_handle_irq(ATH79_MISC_IRQ_GPIO);
-
-        else if (pending & MISC_INT_WDOG)
-                generic_handle_irq(ATH79_MISC_IRQ_WDOG);
+        if (!pending) {
+                spurious_interrupt();
+                return;
+        }
 
-        else if (pending & MISC_INT_ETHSW)
-                generic_handle_irq(ATH79_MISC_IRQ_ETHSW);
+        while (pending) {
+                int bit = __ffs(pending);
 
-        else
-                spurious_interrupt();
+                generic_handle_irq(ATH79_MISC_IRQ(bit));
+                pending &= ~BIT(bit);
+        }
 }
 
 static void ar71xx_misc_irq_unmask(struct irq_data *d)
diff --git a/arch/mips/include/asm/mach-ath79/irq.h b/arch/mips/include/asm/mach-ath79/irq.h
index 0968f69e2018..158ad7f41313 100644
--- a/arch/mips/include/asm/mach-ath79/irq.h
+++ b/arch/mips/include/asm/mach-ath79/irq.h
@@ -14,6 +14,7 @@
 
 #define ATH79_MISC_IRQ_BASE     8
 #define ATH79_MISC_IRQ_COUNT    32
+#define ATH79_MISC_IRQ(_x)      (ATH79_MISC_IRQ_BASE + (_x))
 
 #define ATH79_PCI_IRQ_BASE      (ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT)
 #define ATH79_PCI_IRQ_COUNT     6