1 files changed, 16 insertions, 4 deletions

diff --git a/arch/arm/mach-tegra/irq.c b/arch/arm/mach-tegra/irq.c
index 4e1afcd54fa..2f5bd2db8e1 100644
--- a/arch/arm/mach-tegra/irq.c
+++ b/arch/arm/mach-tegra/irq.c
@@ -44,14 +44,16 @@
 #define ICTLR_COP_IER_CLR       0x38
 #define ICTLR_COP_IEP_CLASS     0x3c
 
-#define NUM_ICTLRS 4
 #define FIRST_LEGACY_IRQ 32
 
+static int num_ictlrs;
+
 static void __iomem *ictlr_reg_base[] = {
         IO_ADDRESS(TEGRA_PRIMARY_ICTLR_BASE),
         IO_ADDRESS(TEGRA_SECONDARY_ICTLR_BASE),
         IO_ADDRESS(TEGRA_TERTIARY_ICTLR_BASE),
         IO_ADDRESS(TEGRA_QUATERNARY_ICTLR_BASE),
+        IO_ADDRESS(TEGRA_QUINARY_ICTLR_BASE),
 };
 
 static inline void tegra_irq_write_mask(unsigned int irq, unsigned long reg)
@@ -60,7 +62,7 @@ static inline void tegra_irq_write_mask(unsigned int irq, unsigned long reg)
         u32 mask;
 
         BUG_ON(irq < FIRST_LEGACY_IRQ ||
-                irq >= FIRST_LEGACY_IRQ + NUM_ICTLRS * 32);
+                irq >= FIRST_LEGACY_IRQ + num_ictlrs * 32);
 
         base = ictlr_reg_base[(irq - FIRST_LEGACY_IRQ) / 32];
         mask = BIT((irq - FIRST_LEGACY_IRQ) % 32);
@@ -113,8 +115,18 @@ static int tegra_retrigger(struct irq_data *d)
 void __init tegra_init_irq(void)
 {
         int i;
+        void __iomem *distbase;
+
+        distbase = IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE);
+        num_ictlrs = readl_relaxed(distbase + GIC_DIST_CTR) & 0x1f;
+
+        if (num_ictlrs > ARRAY_SIZE(ictlr_reg_base)) {
+                WARN(1, "Too many (%d) interrupt controllers found. Maximum is %d.",
+                        num_ictlrs, ARRAY_SIZE(ictlr_reg_base));
+                num_ictlrs = ARRAY_SIZE(ictlr_reg_base);
+        }
 
-        for (i = 0; i < NUM_ICTLRS; i++) {
+        for (i = 0; i < num_ictlrs; i++) {
                 void __iomem *ictlr = ictlr_reg_base[i];
                 writel(~0, ictlr + ICTLR_CPU_IER_CLR);
                 writel(0, ictlr + ICTLR_CPU_IEP_CLASS);
@@ -131,6 +143,6 @@ void __init tegra_init_irq(void)
          * initialized elsewhere under DT.
          */
         if (!of_have_populated_dt())
-                gic_init(0, 29, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE),
+                gic_init(0, 29, distbase,
                         IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
 }