[U-Boot] [PATCH 10/35] arm: socfpga: Add watchdog disable for socfpga
Marek Vasut
marex at denx.de
Mon Sep 15 13:06:03 CEST 2014
From: Pavel Machek <pavel at denx.de>
This adds watchdog disable. It is neccessary for running Linux kernel.
Signed-off-by: Pavel Machek <pavel at denx.de>
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Chin Liang See <clsee at altera.com>
Cc: Dinh Nguyen <dinguyen at altera.com>
Cc: Albert Aribaud <albert.u.boot at aribaud.net>
Cc: Tom Rini <trini at ti.com>
Cc: Wolfgang Denk <wd at denx.de>
Cc: Pavel Machek <pavel at denx.de>
---
arch/arm/cpu/armv7/socfpga/misc.c | 4 ++++
arch/arm/cpu/armv7/socfpga/reset_manager.c | 13 +++++++++++++
arch/arm/include/asm/arch-socfpga/reset_manager.h | 2 ++
3 files changed, 19 insertions(+)
diff --git a/arch/arm/cpu/armv7/socfpga/misc.c b/arch/arm/cpu/armv7/socfpga/misc.c
index ecae393..15cd8c2 100644
--- a/arch/arm/cpu/armv7/socfpga/misc.c
+++ b/arch/arm/cpu/armv7/socfpga/misc.c
@@ -8,6 +8,7 @@
#include <asm/io.h>
#include <miiphy.h>
#include <netdev.h>
+#include <asm/arch/reset_manager.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -38,6 +39,9 @@ int overwrite_console(void)
int misc_init_r(void)
{
+ /* This is needed, otherwise kernel is rebooted by watchdog. */
+ watchdog_disable();
+
return 0;
}
diff --git a/arch/arm/cpu/armv7/socfpga/reset_manager.c b/arch/arm/cpu/armv7/socfpga/reset_manager.c
index e320c01..07b8c4f 100644
--- a/arch/arm/cpu/armv7/socfpga/reset_manager.c
+++ b/arch/arm/cpu/armv7/socfpga/reset_manager.c
@@ -14,6 +14,19 @@ DECLARE_GLOBAL_DATA_PTR;
static const struct socfpga_reset_manager *reset_manager_base =
(void *)SOCFPGA_RSTMGR_ADDRESS;
+#define RSTMGR_PERMODRST_L4WD0_LSB 6
+
+/* Disable the watchdog (toggle reset to watchdog) */
+void watchdog_disable(void)
+{
+ /* assert reset for watchdog */
+ setbits_le32(&reset_manager_base->per_mod_reset,
+ (1<<RSTMGR_PERMODRST_L4WD0_LSB));
+ /* deassert watchdog from reset (watchdog in not running state) */
+ clrbits_le32(&reset_manager_base->per_mod_reset,
+ (1<<RSTMGR_PERMODRST_L4WD0_LSB));
+}
+
/*
* Write the reset manager register to cause reset
*/
diff --git a/arch/arm/include/asm/arch-socfpga/reset_manager.h b/arch/arm/include/asm/arch-socfpga/reset_manager.h
index 3e95476..e004343 100644
--- a/arch/arm/include/asm/arch-socfpga/reset_manager.h
+++ b/arch/arm/include/asm/arch-socfpga/reset_manager.h
@@ -10,6 +10,8 @@
void reset_cpu(ulong addr);
void reset_deassert_peripherals_handoff(void);
+void watchdog_disable(void);
+
struct socfpga_reset_manager {
u32 status;
u32 ctrl;
--
2.1.0
More information about the U-Boot
mailing list