[ARM] 4984/1: S3C24XX: Do not assert nRSTOUT on BAST over suspend.

Change GPA21 to output over reset so that nRSTOUT is not
asserted whilst suspended.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/mach-bast.c b/arch/arm/mach-s3c2410/mach-bast.c
index 66175471fff3..b45fb65889d2 100644
--- a/arch/arm/mach-s3c2410/mach-bast.c
+++ b/arch/arm/mach-s3c2410/mach-bast.c
@@ -16,6 +16,7 @@
 #include <linux/list.h>
 #include <linux/timer.h>
 #include <linux/init.h>
+#include <linux/sysdev.h>
 #include <linux/serial_core.h>
 #include <linux/platform_device.h>
 #include <linux/dm9000.h>
@@ -236,6 +237,36 @@ static struct platform_device bast_device_nor = {
 
 /* NAND Flash on BAST board */
 
+#ifdef CONFIG_PM
+static int bast_pm_suspend(struct sys_device *sd, pm_message_t state)
+{
+        /* ensure that an nRESET is not generated on resume. */
+        s3c2410_gpio_setpin(S3C2410_GPA21, 1);
+        s3c2410_gpio_cfgpin(S3C2410_GPA21, S3C2410_GPA21_OUT);
+
+        return 0;
+}
+
+static int bast_pm_resume(struct sys_device *sd)
+{
+        s3c2410_gpio_cfgpin(S3C2410_GPA21, S3C2410_GPA21_nRSTOUT);
+        return 0;
+}
+
+#else
+#define bast_pm_suspend NULL
+#define bast_pm_resume NULL
+#endif
+
+static struct sysdev_class bast_pm_sysclass = {
+        set_kset_name("mach-bast"),
+        .suspend        = bast_pm_suspend,
+        .resume         = bast_pm_resume,
+};
+
+static struct sys_device bast_pm_sysdev = {
+        .cls            = &bast_pm_sysclass,
+};
 
 static int smartmedia_map[] = { 0 };
 static int chip0_map[] = { 1 };
@@ -586,6 +617,9 @@ static void __init bast_map_io(void)
 
 static void __init bast_init(void)
 {
+        sysdev_class_register(&bast_pm_sysclass);
+        sysdev_register(&bast_pm_sysdev);
+
         s3c24xx_fb_set_platdata(&bast_fb_info);
         platform_add_devices(bast_devices, ARRAY_SIZE(bast_devices));
 }