realtek: add Hasivo MCU watchdog driver
Add a watchdog driver for the external management MCU on Hasivo /
Horaco network switches, reachable over I2C. Without periodic
keepalive the MCU resets the board every ~3 minutes.
The driver arms the MCU at probe and registers a struct
watchdog_device with WDOG_HW_RUNNING so the watchdog core feeds the
chip via a kernel timer until userspace opens the watchdog node.
Timeout is fixed at 15s; the hardware threshold is baked into MCU
firmware and is not software-configurable.
The I2C address is supplied per-board in the device tree via the
`reg` property. The driver does not constrain or probe a specific
address. Known addresses across current Hasivo / Horaco silicon:
- 0x6F: Hasivo S1300WP-8XGT-4S+, Hasivo F5800W-12S+,
Horaco ZX-SW82TS-L2P (default / most common)
- 0x6E: alternate Hasivo / Horaco variant
The driver, its device-tree binding and the Kconfig/Makefile wiring
are added to the kernel tree as a realtek target patch and exposed as
the kmod-hasivo-mcu-wdt KernelPackage. Keeping the binding in the
kernel tree lets dt_binding_check exercise it during the build and
makes the whole driver easy to drop once it lands upstream.
Tested on Hasivo S1300WP-8XGT-4S+ (RTL9313). Unbinding the driver
causes the MCU to power-cycle the board within ~15s.
Signed-off-by: Carlo Szelinsky <github@szelinsky.de>
Link: https://github.com/openwrt/openwrt/pull/23418
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
This commit is contained in:
Carlo Szelinsky
Markus Stockhausen
parent
c9406df918
commit
d048137e85
@ -6,6 +6,24 @@
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#
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#
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MFD_MENU:=MultiFunction Device (MFD) Support
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MFD_MENU:=MultiFunction Device (MFD) Support
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WATCHDOG_MENU:=Watchdog Timer Support
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define KernelPackage/hasivo-mcu-wdt
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SUBMENU:=$(WATCHDOG_MENU)
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TITLE:=Hasivo MCU watchdog driver
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KCONFIG:=CONFIG_HASIVO_MCU_WATCHDOG
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FILES:=$(LINUX_DIR)/drivers/watchdog/hasivo-mcu-wdt.ko
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DEPENDS:=@TARGET_realtek +kmod-i2c-core
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AUTOLOAD:=$(call AutoProbe,hasivo-mcu-wdt,1)
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endef
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define KernelPackage/hasivo-mcu-wdt/description
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Hardware watchdog driver for the external management MCU found on
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Hasivo / Horaco network switches. Registers a Linux watchdog device;
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the kernel watchdog core feeds it automatically via its own timer.
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endef
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$(eval $(call KernelPackage,hasivo-mcu-wdt))
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define KernelPackage/mfd-hasivo-stc8
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define KernelPackage/mfd-hasivo-stc8
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SUBMENU:=$(MFD_MENU)
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SUBMENU:=$(MFD_MENU)
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277
target/linux/realtek/patches-6.18/810-add-hasivo-mcu-wdt.patch
Normal file
277
target/linux/realtek/patches-6.18/810-add-hasivo-mcu-wdt.patch
Normal file
@ -0,0 +1,277 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Carlo Szelinsky <github@szelinsky.de>
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Date: Sat, 30 May 2026 12:00:00 +0200
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Subject: watchdog: add Hasivo MCU watchdog driver
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Hardware watchdog driver for the external management MCU found on
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Hasivo / Horaco network switches, reachable over I2C. Without periodic
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keepalive the MCU resets the board every ~3 minutes.
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The driver arms the MCU at probe and registers a struct watchdog_device
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with WDOG_HW_RUNNING so the watchdog core feeds the chip via a kernel
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timer until userspace opens the watchdog node. Timeout is fixed at 15s;
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the hardware threshold is baked into MCU firmware and is not
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software-configurable.
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Signed-off-by: Carlo Szelinsky <github@szelinsky.de>
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Signed-off-by: Manuel Stocker <mensi@mensi.ch>
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---
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/watchdog/hasivo,mcu-wdt.yaml
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@@ -0,0 +1,45 @@
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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+%YAML 1.2
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+---
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+$id: http://devicetree.org/schemas/watchdog/hasivo,mcu-wdt.yaml#
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+$schema: http://devicetree.org/meta-schemas/core.yaml#
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+
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+title: Hasivo / Horaco external management MCU watchdog
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+
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+maintainers:
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+ - Carlo Szelinsky <github@szelinsky.de>
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+ - Manuel Stocker <mensi@mensi.ch>
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+
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+description: |
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+ Management microcontroller found on Hasivo and Horaco network switches,
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+ exposed on the system I2C bus. Provides a hardware watchdog that must be
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+ armed and periodically retriggered by the host via I2C writes.
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+
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+allOf:
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+ - $ref: watchdog.yaml#
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+
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+properties:
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+ compatible:
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+ const: hasivo,mcu-wdt
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+
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+ reg:
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+ maxItems: 1
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+
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+required:
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+ - compatible
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+ - reg
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+
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+unevaluatedProperties: false
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+
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+examples:
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+ - |
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+ i2c {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ watchdog@6f {
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+ compatible = "hasivo,mcu-wdt";
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+ reg = <0x6f>;
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+ };
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+ };
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+...
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--- a/drivers/watchdog/Kconfig
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+++ b/drivers/watchdog/Kconfig
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@@ -302,6 +302,18 @@ config MENF21BMC_WATCHDOG
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This driver can also be built as a module. If so the module
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will be called menf21bmc_wdt.
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+config HASIVO_MCU_WATCHDOG
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+ tristate "Hasivo MCU Watchdog"
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+ depends on I2C
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+ select WATCHDOG_CORE
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+ help
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+ Hardware watchdog driver for the external management MCU found
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+ on Hasivo and Horaco network switches, reachable over I2C. The
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+ MCU resets the board unless it is periodically retriggered.
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+
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+ This driver can also be built as a module. If so the module
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+ will be called hasivo-mcu-wdt.
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+
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config MENZ069_WATCHDOG
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tristate "MEN 16Z069 Watchdog"
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depends on MCB
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--- a/drivers/watchdog/Makefile
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+++ b/drivers/watchdog/Makefile
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@@ -239,6 +239,7 @@ obj-$(CONFIG_NCT6694_WATCHDOG) += nct669
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obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o
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obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
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obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o
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+obj-$(CONFIG_HASIVO_MCU_WATCHDOG) += hasivo-mcu-wdt.o
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obj-$(CONFIG_MENZ069_WATCHDOG) += menz69_wdt.o
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obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o
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obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o
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--- /dev/null
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+++ b/drivers/watchdog/hasivo-mcu-wdt.c
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@@ -0,0 +1,177 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+/*
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+ * Hasivo MCU Watchdog Driver
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+ *
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+ * Hardware watchdog driver for the external management MCU found on
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+ * Hasivo / Horaco network switches. Communicates over I2C.
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+ *
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+ * Protocol reverse-engineered from the stock firmware ("imi" daemon +
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+ * i2c-poe.ko kernel module):
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+ * - Arm: write 0x4F -> reg 0x09 (unlock), 0x4F -> reg 0x0A
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+ * - Disarm: write 0x4F -> reg 0x09 (unlock), 0x3F -> reg 0x0A
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+ * - Keepalive: write 0xEE -> reg 0x0B (no unlock needed)
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+ *
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+ * Copyright (C) 2026 Manuel Stocker <mensi@mensi.ch>
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+ * Copyright (C) 2026 Carlo Szelinsky <github@szelinsky.de>
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+ */
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+
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+#include <linux/i2c.h>
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+#include <linux/module.h>
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+#include <linux/watchdog.h>
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+
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+#define HASIVO_REG_WDT_UNLOCK 0x09
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+ #define HASIVO_WDT_UNLOCK_MAGIC 0x4f
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+
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+#define HASIVO_REG_WDT_CMD 0x0a
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+ #define HASIVO_WDT_CMD_ARM 0x4f
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+ #define HASIVO_WDT_CMD_DISARM 0x3f
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+
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+#define HASIVO_REG_WDT_KEEPALIVE 0x0b
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+ #define HASIVO_WDT_KEEPALIVE_MAGIC 0xee
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+
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+/*
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+ * Hardware timeout is fixed in MCU firmware and not software-
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+ * configurable. Stock keepalive cadence is 2 s; the actual reset
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+ * threshold is empirically in the 10-30 s range. Pick a conservative
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+ * value so the kernel-core auto-feed (which fires at timeout/2) leaves
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+ * generous slack.
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+ */
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+#define HASIVO_WDT_TIMEOUT 15
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+
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+struct hasivo_mcu {
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+ struct i2c_client *client;
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+ struct watchdog_device wdd;
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+};
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+
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+static int hasivo_mcu_wdt_send_cmd(struct hasivo_mcu *mcu, u8 cmd)
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+{
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+ int ret;
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+
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+ ret = i2c_smbus_write_byte_data(mcu->client, HASIVO_REG_WDT_UNLOCK,
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+ HASIVO_WDT_UNLOCK_MAGIC);
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+ if (ret)
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+ return ret;
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+
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+ return i2c_smbus_write_byte_data(mcu->client, HASIVO_REG_WDT_CMD, cmd);
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+}
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+
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+static int hasivo_mcu_wdt_start(struct watchdog_device *wdd)
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+{
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+ struct hasivo_mcu *mcu = watchdog_get_drvdata(wdd);
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+
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+ return hasivo_mcu_wdt_send_cmd(mcu, HASIVO_WDT_CMD_ARM);
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+}
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+
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+static int hasivo_mcu_wdt_stop(struct watchdog_device *wdd)
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+{
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+ struct hasivo_mcu *mcu = watchdog_get_drvdata(wdd);
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+
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+ return hasivo_mcu_wdt_send_cmd(mcu, HASIVO_WDT_CMD_DISARM);
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+}
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+
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+static int hasivo_mcu_wdt_ping(struct watchdog_device *wdd)
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+{
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+ struct hasivo_mcu *mcu = watchdog_get_drvdata(wdd);
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+
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+ return i2c_smbus_write_byte_data(mcu->client,
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+ HASIVO_REG_WDT_KEEPALIVE,
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+ HASIVO_WDT_KEEPALIVE_MAGIC);
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+}
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+
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+static const struct watchdog_info hasivo_mcu_wdt_info = {
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+ .identity = "Hasivo MCU Watchdog",
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+ .options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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+};
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+
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+static const struct watchdog_ops hasivo_mcu_wdt_ops = {
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+ .owner = THIS_MODULE,
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+ .start = hasivo_mcu_wdt_start,
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+ .stop = hasivo_mcu_wdt_stop,
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+ .ping = hasivo_mcu_wdt_ping,
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+};
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+
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+static int hasivo_mcu_probe(struct i2c_client *client)
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+{
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+ struct device *dev = &client->dev;
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+ struct hasivo_mcu *mcu;
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+ int ret;
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+
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+ mcu = devm_kzalloc(dev, sizeof(*mcu), GFP_KERNEL);
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+ if (!mcu)
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+ return -ENOMEM;
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+
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+ mcu->client = client;
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+
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+ /*
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+ * Arm the watchdog. The stock bootloader normally leaves it
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+ * already armed (and the chip's timer has been counting since
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+ * then); re-arm explicitly so unexpected boot paths still leave
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+ * it in a known state. It is not specified whether the arm
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+ * sequence resets the chip's timeout counter, so send an
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+ * explicit keepalive afterwards to guarantee a fresh window
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+ * before the kernel-side feeder takes over at timeout/2.
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+ */
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+ ret = hasivo_mcu_wdt_send_cmd(mcu, HASIVO_WDT_CMD_ARM);
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+ if (ret)
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+ return dev_err_probe(dev, ret, "failed to arm watchdog\n");
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+
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+ ret = i2c_smbus_write_byte_data(client, HASIVO_REG_WDT_KEEPALIVE,
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+ HASIVO_WDT_KEEPALIVE_MAGIC);
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+ if (ret)
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+ return dev_err_probe(dev, ret,
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+ "initial watchdog ping failed\n");
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+
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+ mcu->wdd.info = &hasivo_mcu_wdt_info;
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+ mcu->wdd.ops = &hasivo_mcu_wdt_ops;
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+ mcu->wdd.parent = dev;
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+ mcu->wdd.timeout = HASIVO_WDT_TIMEOUT;
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+ mcu->wdd.min_timeout = HASIVO_WDT_TIMEOUT;
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+ mcu->wdd.max_timeout = HASIVO_WDT_TIMEOUT;
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+
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+ /*
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+ * Tell the watchdog core the hardware is already running so it
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+ * pings via its own timer at timeout/2 until userspace (procd)
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+ * opens /dev/watchdog0 and takes over.
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+ */
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+ set_bit(WDOG_HW_RUNNING, &mcu->wdd.status);
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+
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+ watchdog_set_drvdata(&mcu->wdd, mcu);
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+ watchdog_stop_on_unregister(&mcu->wdd);
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+
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+ ret = devm_watchdog_register_device(dev, &mcu->wdd);
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+ if (ret)
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+ return dev_err_probe(dev, ret,
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+ "failed to register watchdog\n");
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+
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+ dev_info(dev, "Hasivo MCU watchdog armed at 0x%02x (timeout %us)\n",
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+ client->addr, mcu->wdd.timeout);
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id hasivo_mcu_of_match[] = {
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+ { .compatible = "hasivo,mcu-wdt" },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, hasivo_mcu_of_match);
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+
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+static const struct i2c_device_id hasivo_mcu_id[] = {
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+ { "hasivo-mcu-wdt" },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(i2c, hasivo_mcu_id);
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+
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+static struct i2c_driver hasivo_mcu_driver = {
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+ .driver = {
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+ .name = "hasivo-mcu-wdt",
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+ .of_match_table = hasivo_mcu_of_match,
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+ },
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+ .probe = hasivo_mcu_probe,
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+ .id_table = hasivo_mcu_id,
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+};
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+module_i2c_driver(hasivo_mcu_driver);
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+
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+MODULE_DESCRIPTION("Hasivo MCU Watchdog Driver");
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Manuel Stocker <mensi@mensi.ch>");
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+MODULE_AUTHOR("Carlo Szelinsky <github@szelinsky.de>");
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@ -97,6 +97,7 @@ CONFIG_GPIO_WATCHDOG=y
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# CONFIG_GPIO_WATCHDOG_ARCH_INITCALL is not set
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# CONFIG_GPIO_WATCHDOG_ARCH_INITCALL is not set
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CONFIG_GRO_CELLS=y
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CONFIG_GRO_CELLS=y
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CONFIG_HARDWARE_WATCHPOINTS=y
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CONFIG_HARDWARE_WATCHPOINTS=y
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# CONFIG_HASIVO_MCU_WATCHDOG is not set
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CONFIG_HAS_DMA=y
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CONFIG_HAS_DMA=y
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CONFIG_HAS_IOMEM=y
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CONFIG_HAS_IOMEM=y
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CONFIG_HAS_IOPORT=y
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CONFIG_HAS_IOPORT=y
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@ -100,6 +100,7 @@ CONFIG_GPIO_WATCHDOG=y
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# CONFIG_GPIO_WATCHDOG_ARCH_INITCALL is not set
|
# CONFIG_GPIO_WATCHDOG_ARCH_INITCALL is not set
|
||||||
CONFIG_GRO_CELLS=y
|
CONFIG_GRO_CELLS=y
|
||||||
CONFIG_HARDWARE_WATCHPOINTS=y
|
CONFIG_HARDWARE_WATCHPOINTS=y
|
||||||
|
# CONFIG_HASIVO_MCU_WATCHDOG is not set
|
||||||
CONFIG_HAS_DMA=y
|
CONFIG_HAS_DMA=y
|
||||||
CONFIG_HAS_IOMEM=y
|
CONFIG_HAS_IOMEM=y
|
||||||
CONFIG_HAS_IOPORT=y
|
CONFIG_HAS_IOPORT=y
|
||||||
|
|||||||
@ -86,6 +86,7 @@ CONFIG_GPIO_WATCHDOG=y
|
|||||||
# CONFIG_GPIO_WATCHDOG_ARCH_INITCALL is not set
|
# CONFIG_GPIO_WATCHDOG_ARCH_INITCALL is not set
|
||||||
CONFIG_GRO_CELLS=y
|
CONFIG_GRO_CELLS=y
|
||||||
CONFIG_HARDWARE_WATCHPOINTS=y
|
CONFIG_HARDWARE_WATCHPOINTS=y
|
||||||
|
# CONFIG_HASIVO_MCU_WATCHDOG is not set
|
||||||
CONFIG_HAS_DMA=y
|
CONFIG_HAS_DMA=y
|
||||||
CONFIG_HAS_IOMEM=y
|
CONFIG_HAS_IOMEM=y
|
||||||
CONFIG_HAS_IOPORT=y
|
CONFIG_HAS_IOPORT=y
|
||||||
|
|||||||
@ -88,6 +88,7 @@ CONFIG_GPIO_REALTEK_OTTO=y
|
|||||||
CONFIG_GPIO_REGMAP=y
|
CONFIG_GPIO_REGMAP=y
|
||||||
CONFIG_GRO_CELLS=y
|
CONFIG_GRO_CELLS=y
|
||||||
CONFIG_HARDWARE_WATCHPOINTS=y
|
CONFIG_HARDWARE_WATCHPOINTS=y
|
||||||
|
# CONFIG_HASIVO_MCU_WATCHDOG is not set
|
||||||
CONFIG_HAS_DMA=y
|
CONFIG_HAS_DMA=y
|
||||||
CONFIG_HAS_IOMEM=y
|
CONFIG_HAS_IOMEM=y
|
||||||
CONFIG_HAS_IOPORT=y
|
CONFIG_HAS_IOPORT=y
|
||||||
|
|||||||
@ -88,6 +88,7 @@ CONFIG_GPIO_REALTEK_OTTO=y
|
|||||||
CONFIG_GPIO_REGMAP=y
|
CONFIG_GPIO_REGMAP=y
|
||||||
CONFIG_GRO_CELLS=y
|
CONFIG_GRO_CELLS=y
|
||||||
CONFIG_HARDWARE_WATCHPOINTS=y
|
CONFIG_HARDWARE_WATCHPOINTS=y
|
||||||
|
# CONFIG_HASIVO_MCU_WATCHDOG is not set
|
||||||
CONFIG_HAS_DMA=y
|
CONFIG_HAS_DMA=y
|
||||||
CONFIG_HAS_IOMEM=y
|
CONFIG_HAS_IOMEM=y
|
||||||
CONFIG_HAS_IOPORT=y
|
CONFIG_HAS_IOPORT=y
|
||||||
|
|||||||
@ -90,6 +90,7 @@ CONFIG_GPIO_REALTEK_OTTO=y
|
|||||||
CONFIG_GPIO_REGMAP=y
|
CONFIG_GPIO_REGMAP=y
|
||||||
CONFIG_GRO_CELLS=y
|
CONFIG_GRO_CELLS=y
|
||||||
CONFIG_HARDWARE_WATCHPOINTS=y
|
CONFIG_HARDWARE_WATCHPOINTS=y
|
||||||
|
# CONFIG_HASIVO_MCU_WATCHDOG is not set
|
||||||
CONFIG_HAS_DMA=y
|
CONFIG_HAS_DMA=y
|
||||||
CONFIG_HAS_IOMEM=y
|
CONFIG_HAS_IOMEM=y
|
||||||
CONFIG_HAS_IOPORT=y
|
CONFIG_HAS_IOPORT=y
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user