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authorHiroshi DOYU <Hiroshi.DOYU@nokia.com>2006-09-25 12:41:46 +0300
committerTony Lindgren <tony@atomide.com>2006-09-25 12:41:46 +0300
commitbee7930f4aa501de4e3c793640c3af31fd3867e2 (patch)
tree2df6d29c65e21ba82f1ac86ae42a5a7f16c48d74 /arch/arm
parent0d9356cbb5d7a0bc8628f74fb15fd7268372c7fe (diff)
downloadop-kernel-dev-bee7930f4aa501de4e3c793640c3af31fd3867e2.zip
op-kernel-dev-bee7930f4aa501de4e3c793640c3af31fd3867e2.tar.gz
ARM: OMAP: GPIO: IRQSTATUS2 workaround for retention state
In OMAP2420, an incoming GPIO interrupt always sets both GPIO_IRQSTATUS1 and GPIO_IRQSTATUS2, even if the relevant bit is disabled in GPIO_IRQENABLE1/2 and DSP doesn't use GPIO at all. GPIO_IRQSTATUS1 is for MPU and GPIO_IRQSTATUS2 is for DSP. If IRQSTATUS is set, this will prevent the system from going to idle state. This patch also clears IRQSTATUS2 to avoid the above situation. Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com> Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/plat-omap/gpio.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index f7f929a..f1aaa55 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -94,6 +94,8 @@
#define OMAP24XX_GPIO_SYSCONFIG 0x0010
#define OMAP24XX_GPIO_SYSSTATUS 0x0014
#define OMAP24XX_GPIO_IRQSTATUS1 0x0018
+#define OMAP24XX_GPIO_IRQSTATUS2 0x0028
+#define OMAP24XX_GPIO_IRQENABLE2 0x002c
#define OMAP24XX_GPIO_IRQENABLE1 0x001c
#define OMAP24XX_GPIO_CTRL 0x0030
#define OMAP24XX_GPIO_OE 0x0034
@@ -529,6 +531,10 @@ static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
return;
}
__raw_writel(gpio_mask, reg);
+
+ /* Workaround for clearing DSP GPIO interrupts to allow retention */
+ if (cpu_is_omap2420())
+ __raw_writel(gpio_mask, bank->base + OMAP24XX_GPIO_IRQSTATUS2);
}
static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
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