board/czechlight/clearfog/patches/u-boot/0001-Unconditionally-enable-watchdog-timer-on-Clearfog.patch

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