From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felipe Balbi Subject: [PATCH 35/35] irq: intc: enable IP protection Date: Mon, 28 Jul 2014 16:16:23 -0500 Message-ID: <1406582183-696-36-git-send-email-balbi@ti.com> References: <1406582183-696-1-git-send-email-balbi@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1406582183-696-1-git-send-email-balbi@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Tony Lindgren Cc: Linux OMAP Mailing List , Linux ARM Kernel Mailing List , bcousson@baylibre.com, linux@arm.linux.org.uk, khilman@deeprootsystems.com, tglx@linutronix.de, jason@lakedaemon.net, devicetree@vger.kernel.org, Linux Kernel Mailing List , Felipe Balbi List-Id: devicetree@vger.kernel.org When PROTECTION bit in enabled in PROTECTION register, INTC's registers are only accessible from privileged mode. Signed-off-by: Felipe Balbi --- 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