[PATCH 35/35] irq: intc: enable IP protection

Felipe Balbi
2014-07-28T21:16:23Z

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

Signed-off-by: Felipe Balbi <balbi@ti.com>
---
drivers/irqchip/irq-omap-intc.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-omap-intc.c b/drivers/irqchip/irq-omap-intc.c
index 371ff5e..28c8b6d 100644
--- a/drivers/irqchip/irq-omap-intc.c
+++ b/drivers/irqchip/irq-omap-intc.c
@@ -52,6 +52,8 @@
#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
@@ -291,12 +293,28 @@ 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
--
2.0.1.563.g66f467c