Enable watchdog on Clearfog
Here's how it works:
- U-Boot configures the watchdog and leaves it running. It will still
reset the watchdog while the CLI is active, though, so interactive
sessions are not really affected by this.
- The Linux kernel simply ignores the watchdog. It won't do anything.
- systemd reconfigures the watchdog and ensures that it's being reset
periodically.
If for some reason systemd cannot configure/reset the watchdog, the
system will eventually reboot because the kernel had not disabled the
watchdog earlier in the boot -- i.e., U-Boot's configuration is still
live.
Change-Id: I1cb7eefe8969139aceba6c0559983240c6dad49e
diff --git a/board/czechlight/clearfog/patches/u-boot/0001-Unconditionally-enable-watchdog-timer-on-Clearfog.patch b/board/czechlight/clearfog/patches/u-boot/0001-Unconditionally-enable-watchdog-timer-on-Clearfog.patch
new file mode 100644
index 0000000..3fbf52b
--- /dev/null
+++ b/board/czechlight/clearfog/patches/u-boot/0001-Unconditionally-enable-watchdog-timer-on-Clearfog.patch
@@ -0,0 +1,125 @@
+From 7242f6d20423a7705080d54828468b3a31071566 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Jan=20Kundr=C3=A1t?= <jan.kundrat@cesnet.cz>
+Date: Fri, 29 Sep 2017 18:11:04 +0200
+Subject: [PATCH] Unconditionally enable watchdog timer on Clearfog
+
+We will only be booting kernels that support the watchdog, so there's no
+risk in leaving our WD running while we hand over to the kernel.
+
+The code was copied from the Turris Omnia version and used as-is. The
+only exception is the built-in MCU reset which is not present on our
+boards.
+---
+ board/solidrun/clearfog/clearfog.c | 43 ++++++++++++++++++++++++++++++++++++++
+ configs/clearfog_defconfig | 2 ++
+ include/configs/clearfog.h | 5 +++++
+ 3 files changed, 50 insertions(+)
+
+diff --git a/board/solidrun/clearfog/clearfog.c b/board/solidrun/clearfog/clearfog.c
+index 8906636f76..f94bd5e465 100644
+--- a/board/solidrun/clearfog/clearfog.c
++++ b/board/solidrun/clearfog/clearfog.c
+@@ -11,10 +11,15 @@
+ #include <asm/io.h>
+ #include <asm/arch/cpu.h>
+ #include <asm/arch/soc.h>
++#include <dm/uclass.h>
+
+ #include "../drivers/ddr/marvell/a38x/ddr3_a38x_topology.h"
+ #include <../serdes/a38x/high_speed_env_spec.h>
+
++#ifdef CONFIG_WDT_ORION
++# include <wdt.h>
++#endif
++
+ DECLARE_GLOBAL_DATA_PTR;
+
+ #define ETH_PHY_CTRL_REG 0
+@@ -122,6 +127,10 @@ int board_early_init_f(void)
+ return 0;
+ }
+
++#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION)
++static struct udevice *watchdog_dev = NULL;
++#endif
++
+ int board_init(void)
+ {
+ int i;
+@@ -129,6 +138,18 @@ int board_init(void)
+ /* Address of boot parameters */
+ gd->bd->bi_boot_params = mvebu_sdram_bar(0) + 0x100;
+
++#ifndef CONFIG_SPL_BUILD
++# ifdef CONFIG_WDT_ORION
++ if (uclass_get_device(UCLASS_WDT, 0, &watchdog_dev)) {
++ puts("Cannot find Armada 385 watchdog!\n");
++ } else {
++ puts("Enabling Armada 385 watchdog.\n");
++ /* one minute */
++ wdt_start(watchdog_dev, (u32) 25000000 * 60, 0);
++ }
++# endif
++#endif
++
+ /* Toggle GPIO41 to reset onboard switch and phy */
+ clrbits_le32(MVEBU_GPIO1_BASE + 0x0, BIT(9));
+ clrbits_le32(MVEBU_GPIO1_BASE + 0x4, BIT(9));
+@@ -147,6 +168,28 @@ int board_init(void)
+ return 0;
+ }
+
++#ifdef CONFIG_WATCHDOG
++/* Called by macro WATCHDOG_RESET */
++void watchdog_reset(void)
++{
++# if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION)
++ static ulong next_reset = 0;
++ ulong now;
++
++ if (!watchdog_dev)
++ return;
++
++ now = timer_get_us();
++
++ /* Do not reset the watchdog too often */
++ if (now > next_reset) {
++ wdt_reset(watchdog_dev);
++ next_reset = now + 1000;
++ }
++# endif
++}
++#endif
++
+ int checkboard(void)
+ {
+ puts("Board: SolidRun ClearFog\n");
+diff --git a/configs/clearfog_defconfig b/configs/clearfog_defconfig
+index 5eceacf491..fd48b0db02 100644
+--- a/configs/clearfog_defconfig
++++ b/configs/clearfog_defconfig
+@@ -46,3 +46,5 @@ CONFIG_USB=y
+ CONFIG_DM_USB=y
+ CONFIG_USB_EHCI_HCD=y
+ CONFIG_USB_STORAGE=y
++CONFIG_WDT=y
++CONFIG_WDT_ORION=y
+diff --git a/include/configs/clearfog.h b/include/configs/clearfog.h
+index 5061f6c6fd..eac1e8bbce 100644
+--- a/include/configs/clearfog.h
++++ b/include/configs/clearfog.h
+@@ -32,6 +32,11 @@
+ #define CONFIG_SYS_I2C_SLAVE 0x0
+ #define CONFIG_SYS_I2C_SPEED 100000
+
++/* Watchdog */
++#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_WDT_ORION)
++# define CONFIG_WATCHDOG
++#endif
++
+ /* SPI NOR flash default params, used by sf commands */
+ #define CONFIG_SF_DEFAULT_SPEED 1000000
+ #define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
+--
+2.14.1
+
diff --git a/configs/czechlight_clearfog_defconfig b/configs/czechlight_clearfog_defconfig
index a47b63e..9c93dfd 100644
--- a/configs/czechlight_clearfog_defconfig
+++ b/configs/czechlight_clearfog_defconfig
@@ -13,7 +13,7 @@
BR2_INIT_SYSTEMD=y
# BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW is not set
BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/overlay/"
-BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/post-build.sh"
+BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/common/systemd-watchdog.sh $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/post-build.sh"
BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
BR2_ROOTFS_POST_SCRIPT_ARGS="-c $(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/genimage.cfg"
BR2_LINUX_KERNEL=y
@@ -33,6 +33,7 @@
BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
BR2_TARGET_UBOOT_CUSTOM_VERSION=y
BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2017.09"
+BR2_TARGET_UBOOT_PATCH="$(BR2_EXTERNAL_CZECHLIGHT_PATH)/board/czechlight/clearfog/patches/u-boot/0001-Unconditionally-enable-watchdog-timer-on-Clearfog.patch"
BR2_TARGET_UBOOT_BOARD_DEFCONFIG="clearfog"
# BR2_TARGET_UBOOT_FORMAT_BIN is not set
BR2_TARGET_UBOOT_FORMAT_CUSTOM=y