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authorBen Dooks <ben-linux@fluff.org>2007-06-06 10:36:09 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-06-11 09:09:31 +0100
commit5698bd28c67775c722dc1f4ab82e0041c1c740ea (patch)
treec9abe7032122bc466a0d056a7ae4d850d89c91fd
parent55ba86bc6c33ce8b690fdf20ab485ef94cccd423 (diff)
[ARM] 4444/2: OSIRIS: CPLD suspend fix
Ensure the CPLD 8bit settings are preserved over a suspend/resume cycle as the CPU sends a hard-reset at resume time. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mach-s3c2440/mach-osiris.c39
-rw-r--r--include/asm-arm/arch-s3c2410/osiris-cpld.h5
2 files changed, 43 insertions, 1 deletions
diff --git a/arch/arm/mach-s3c2440/mach-osiris.c b/arch/arm/mach-s3c2440/mach-osiris.c
index 64da36a0064..15811601f03 100644
--- a/arch/arm/mach-s3c2440/mach-osiris.c
+++ b/arch/arm/mach-s3c2440/mach-osiris.c
@@ -16,6 +16,7 @@
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/device.h>
+#include <linux/sysdev.h>
#include <linux/serial_core.h>
#include <asm/mach/arch.h>
@@ -245,6 +246,40 @@ static struct platform_device osiris_pcmcia = {
.resource = osiris_pcmcia_resource,
};
+/* Osiris power management device */
+
+#ifdef CONFIG_PM
+static unsigned char pm_osiris_ctrl0;
+
+static int osiris_pm_suspend(struct sys_device *sd, pm_message_t state)
+{
+ pm_osiris_ctrl0 = __raw_readb(OSIRIS_VA_CTRL0);
+ return 0;
+}
+
+static int osiris_pm_resume(struct sys_device *sd)
+{
+ if (pm_osiris_ctrl0 & OSIRIS_CTRL0_FIX8)
+ __raw_writeb(OSIRIS_CTRL1_FIX8, OSIRIS_VA_CTRL1);
+
+ return 0;
+}
+
+#else
+#define osiris_pm_suspend NULL
+#define osiris_pm_resume NULL
+#endif
+
+static struct sysdev_class osiris_pm_sysclass = {
+ set_kset_name("mach-osiris"),
+ .suspend = osiris_pm_suspend,
+ .resume = osiris_pm_resume,
+};
+
+static struct sys_device osiris_pm_sysdev = {
+ .cls = &osiris_pm_sysclass,
+};
+
/* Standard Osiris devices */
static struct platform_device *osiris_devices[] __initdata = {
@@ -299,6 +334,9 @@ static void __init osiris_map_io(void)
static void __init osiris_init(void)
{
+ sysdev_class_register(&osiris_pm_sysclass);
+ sysdev_register(&osiris_pm_sysdev);
+
platform_add_devices(osiris_devices, ARRAY_SIZE(osiris_devices));
};
@@ -310,5 +348,6 @@ MACHINE_START(OSIRIS, "Simtec-OSIRIS")
.map_io = osiris_map_io,
.init_machine = osiris_init,
.init_irq = s3c24xx_init_irq,
+ .init_machine = osiris_init,
.timer = &s3c24xx_timer,
MACHINE_END
diff --git a/include/asm-arm/arch-s3c2410/osiris-cpld.h b/include/asm-arm/arch-s3c2410/osiris-cpld.h
index a3253e979ef..229ab2351db 100644
--- a/include/asm-arm/arch-s3c2410/osiris-cpld.h
+++ b/include/asm-arm/arch-s3c2410/osiris-cpld.h
@@ -1,6 +1,6 @@
/* linux/include/asm-arm/arch-s3c2410/osiris-cpld.h
*
- * Copyright (c) 2005 Simtec Electronics
+ * Copyright 2005 Simtec Electronics
* http://www.simtec.co.uk/products/
* Ben Dooks <ben@simtec.co.uk>
*
@@ -19,9 +19,12 @@
#define OSIRIS_CTRL0_NANDSEL (0x3)
#define OSIRIS_CTRL0_BOOT_INT (1<<3)
#define OSIRIS_CTRL0_PCMCIA (1<<4)
+#define OSIRIS_CTRL0_FIX8 (1<<5)
#define OSIRIS_CTRL0_PCMCIA_nWAIT (1<<6)
#define OSIRIS_CTRL0_PCMCIA_nIOIS16 (1<<7)
+#define OSIRIS_CTRL1_FIX8 (1<<0)
+
#define OSIRIS_ID_REVMASK (0x7)
#endif /* __ASM_ARCH_OSIRISCPLD_H */