ARM: RX1950: configure GPG13-15 as input before suspend

According to datasheet GPG13-15 must be configured as input in NAND
boot mode, otherwise device will not be able to wake up

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/pm.c b/arch/arm/mach-s3c2410/pm.c
index 6a61486ca75..725636fc4dc 100644
--- a/arch/arm/mach-s3c2410/pm.c
+++ b/arch/arm/mach-s3c2410/pm.c
@@ -79,6 +79,17 @@ static void s3c2410_pm_prepare(void)
         if ( machine_is_aml_m5900() )
                 s3c2410_gpio_setpin(S3C2410_GPF(2), 1);
 
+        if (machine_is_rx1950()) {
+                /* According to S3C2442 user's manual, page 7-17,
+                 * when the system is operating in NAND boot mode,
+                 * the hardware pin configuration - EINT[23:21] –
+                 * must be set as input for starting up after
+                 * wakeup from sleep mode
+                 */
+                s3c_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPIO_INPUT);
+                s3c_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPIO_INPUT);
+                s3c_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPIO_INPUT);
+        }
 }
 
 static int s3c2410_pm_resume(struct sys_device *dev)