MIPS: lantiq: enable oprofile support on lantiq targets

This patch sets the performance counters irq on Lantiq SoCs.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3720/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c
index b6b1c7260c5c..bfd4ad180aac 100644
--- a/arch/mips/lantiq/irq.c
+++ b/arch/mips/lantiq/irq.c
@@ -40,6 +40,9 @@
 
 #define MAX_EIU                 6
 
+/* the performance counter */
+#define LTQ_PERF_IRQ            (INT_NUM_IM4_IRL0 + 31)
+
 /* irqs generated by device attached to the EBU need to be acked in
  * a special manner
  */
@@ -316,6 +319,9 @@ void __init arch_init_irq(void)
         set_c0_status(IE_SW0 | IE_SW1 | IE_IRQ0 | IE_IRQ1 |
                 IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5);
 #endif
+
+        /* tell oprofile which irq to use */
+        cp0_perfcount_irq = LTQ_PERF_IRQ;
 }
 
 unsigned int __cpuinit get_c0_compare_int(void)