irqchip: omap-intc: enable IP protection

When PROTECTION bit in enabled in PROTECTION
register, INTC's registers are only accessible
from privileged mode.

Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/irqchip/irq-omap-intc.c b/drivers/irqchip/irq-omap-intc.c
index e97b535393869d2394303048cb4c855918230e4f..7681b132997601bdbfc3503b6c35411b245785d5 100644 (file)
--- a/drivers/irqchip/irq-omap-intc.c
+++ b/drivers/irqchip/irq-omap-intc.c
@@ -51,6 +51,8 @@
 #define INTCPS_NR_ILR_REGS     128
 #define INTCPS_NR_MIR_REGS     3
 
+#define INTC_PROTECTION_ENABLE (1 << 0)
+
 /*
  * OMAP2 has a number of different interrupt controllers, each interrupt
  * controller is identified as its own "bank". Register definitions are
@@ -290,12 +292,28 @@ static int __init omap_init_irq_legacy(u32 base)
        return 0;
 }
 
+static void __init omap_irq_enable_protection(void)
+{
+       u32 reg;
+
+       reg = intc_readl(INTC_PROTECTION);
+       reg |= INTC_PROTECTION_ENABLE;
+       intc_writel(INTC_PROTECTION, reg);
+}
+
 static int __init omap_init_irq(u32 base, struct device_node *node)
 {
+       int ret;
+
        if (node)
-               return omap_init_irq_of(node);
+               ret = omap_init_irq_of(node);
        else
-               return omap_init_irq_legacy(base);
+               ret = omap_init_irq_legacy(base);
+
+       if (ret == 0)
+               omap_irq_enable_protection();
+
+       return ret;
 }
 
 static asmlinkage void __exception_irq_entry