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Subject[PATCH v6 6/6] watchdog: ahc1ec0-wdt: Add sub-device watchdog for Advantech embedded controller
Date
This is one of sub-device driver for Advantech embedded controller
AHC1EC0. This driver provide watchdog functionality for Advantech
related applications to restart the system.

Changed since V5:
- remove unnecessary header files
- bug fixed: reboot halt if watchdog enabled
- Kconfig: add "AHC1EC0" string to clearly define the EC name

Signed-off-by: Campion Kang <campion.kang@advantech.com.tw>
---
drivers/watchdog/Kconfig | 11 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/ahc1ec0-wdt.c | 261 +++++++++++++++++++++++++++++++++
3 files changed, 273 insertions(+)
create mode 100644 drivers/watchdog/ahc1ec0-wdt.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 7ff941e71b79..1a27836883ac 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1636,6 +1636,17 @@ config NIC7018_WDT
To compile this driver as a module, choose M here: the module will be
called nic7018_wdt.

+config AHC1EC0_WDT
+ tristate "Advantech AHC1EC0 Watchdog Function"
+ depends on MFD_AHC1EC0
+ help
+ This is sub-device for Advantech AHC1EC0 embedded controller.
+
+ This driver provide watchdog functionality for Advantech related
+ applications to restart the system.
+ To compile thie driver as a module, choose M here: the module will be
+ called ahc1ec0-wdt.
+
# M68K Architecture

config M54xx_WATCHDOG
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 5c74ee19d441..7190811b1e50 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -145,6 +145,7 @@ obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o
obj-$(CONFIG_INTEL_MEI_WDT) += mei_wdt.o
obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o
obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o
+obj-$(CONFIG_AHC1EC0_WDT) += ahc1ec0-wdt.o
obj-$(CONFIG_MLX_WDT) += mlx_wdt.o

# M68K Architecture
diff --git a/drivers/watchdog/ahc1ec0-wdt.c b/drivers/watchdog/ahc1ec0-wdt.c
new file mode 100644
index 000000000000..4497b6106b24
--- /dev/null
+++ b/drivers/watchdog/ahc1ec0-wdt.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Watchdog Driver for Advantech Embedded Controller chip AHC1EC0
+ *
+ * Copyright 2020, Advantech IIoT Group
+ *
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/mfd/ahc1ec0.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+#define DRV_NAME "ahc1ec0-wdt"
+
+struct ec_wdt_data {
+ struct watchdog_device wdtdev;
+ struct adv_ec_platform_data *adv_ec_data;
+ struct notifier_block reboot_nb;
+ struct mutex lock_ioctl;
+ int is_enable;
+ int current_timeout;
+};
+
+#define EC_WDT_MIN_TIMEOUT 1 /* The watchdog devices minimum timeout value (in seconds). */
+#define EC_WDT_MAX_TIMEOUT 600 /* The watchdog devices maximum timeout value (in seconds) */
+#define EC_WDT_DEFAULT_TIMEOUT 45
+
+static int set_delay(struct adv_ec_platform_data *adv_ec_data, unsigned short delay_timeout_in_ms)
+{
+ if (write_hw_ram(adv_ec_data, EC_RESET_DELAY_TIME_L, delay_timeout_in_ms & 0x00FF)) {
+ pr_err("Failed to set Watchdog Retset Time Low byte.");
+ return -EINVAL;
+ }
+
+ if (write_hw_ram(adv_ec_data, EC_RESET_DELAY_TIME_H, (delay_timeout_in_ms & 0xFF00) >> 8)) {
+ pr_err("Failed to set Watchdog Retset Time Hight byte.");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int advwdt_set_heartbeat(unsigned long t)
+{
+ if (t < 1 || t > 6553) {
+ pr_err("%s: the input timeout is out of range.", __func__);
+ pr_err("Please choose valid data between 1 ~ 6553.");
+ return -EINVAL;
+ }
+
+ return (t * 10);
+}
+
+/* Notifier for system down */
+static int advwdt_notify_sys(struct notifier_block *nb, unsigned long code, void *data)
+{
+ if (code == SYS_DOWN || code == SYS_HALT) {
+ struct ec_wdt_data *ec_wdt_data;
+
+ ec_wdt_data = container_of(nb, struct ec_wdt_data, reboot_nb);
+ if (!ec_wdt_data)
+ return NOTIFY_BAD;
+
+ /* Turn the WDT off */
+ if (write_hwram_command(ec_wdt_data->adv_ec_data, EC_WDT_STOP)) {
+ pr_err("Failed to set Watchdog stop.");
+ return -EINVAL;
+ }
+ ec_wdt_data->is_enable = 0;
+ pr_info("%s: notify sys shutdown", __func__);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static int ec_wdt_start(struct watchdog_device *wdd)
+{
+ int ret;
+ int timeout, timeout_in_ms;
+ struct ec_wdt_data *ec_wdt_data = watchdog_get_drvdata(wdd);
+ struct adv_ec_platform_data *adv_ec_data;
+
+ dev_dbg(wdd->parent, "%s\n", __func__);
+
+ adv_ec_data = ec_wdt_data->adv_ec_data;
+ timeout = wdd->timeout; /* The watchdog devices timeout value (in seconds). */
+
+ mutex_lock(&ec_wdt_data->lock_ioctl);
+
+ timeout_in_ms = advwdt_set_heartbeat(timeout);
+ if (timeout_in_ms < 0) {
+ mutex_unlock(&ec_wdt_data->lock_ioctl);
+ return timeout_in_ms;
+ }
+
+ ret = set_delay(adv_ec_data, (unsigned short)(timeout_in_ms-1));
+ if (ret) {
+ dev_err(wdd->parent, "Failed to set Watchdog delay (ret=%x).\n", ret);
+ mutex_unlock(&ec_wdt_data->lock_ioctl);
+ return ret;
+ }
+ ret = write_hwram_command(adv_ec_data, EC_WDT_STOP);
+ ret = write_hwram_command(adv_ec_data, EC_WDT_START);
+ if (ret) {
+ dev_err(wdd->parent, "Failed to set Watchdog start (ret=%x).\n", ret);
+ mutex_unlock(&ec_wdt_data->lock_ioctl);
+ return ret;
+ }
+ ec_wdt_data->is_enable = 1;
+ ec_wdt_data->current_timeout = timeout_in_ms/10;
+
+ mutex_unlock(&ec_wdt_data->lock_ioctl);
+ return 0;
+}
+
+static int ec_wdt_stop(struct watchdog_device *wdd)
+{
+ int ret;
+ struct ec_wdt_data *ec_wdt_data = watchdog_get_drvdata(wdd);
+ struct adv_ec_platform_data *adv_ec_data;
+
+ dev_dbg(wdd->parent, "%s\n", __func__);
+
+ adv_ec_data = ec_wdt_data->adv_ec_data;
+
+ mutex_lock(&ec_wdt_data->lock_ioctl);
+ ret = write_hwram_command(adv_ec_data, EC_WDT_STOP);
+ mutex_unlock(&ec_wdt_data->lock_ioctl);
+ if (ret)
+ pr_err("Failed to set Watchdog stop.");
+ else
+ ec_wdt_data->is_enable = 0;
+
+ return ret;
+}
+
+static int ec_wdt_ping(struct watchdog_device *wdd)
+{
+ int ret;
+ struct ec_wdt_data *ec_wdt_data = watchdog_get_drvdata(wdd);
+ struct adv_ec_platform_data *adv_ec_data;
+
+ dev_dbg(wdd->parent, "%s\n", __func__);
+
+ adv_ec_data = ec_wdt_data->adv_ec_data;
+
+ mutex_lock(&ec_wdt_data->lock_ioctl);
+ ret = write_hwram_command(adv_ec_data, EC_WDT_RESET);
+ mutex_unlock(&ec_wdt_data->lock_ioctl);
+ if (ret) {
+ pr_err("Failed to set Watchdog reset.");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ec_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ dev_dbg(wdd->parent, "%s, timeout=%d\n", __func__, timeout);
+
+ wdd->timeout = timeout;
+
+ if (watchdog_active(wdd))
+ return ec_wdt_start(wdd);
+
+ return 0;
+}
+
+static const struct watchdog_info ec_watchdog_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+ .identity = "AHC1EC0 Watchdog",
+};
+
+static const struct watchdog_ops ec_watchdog_ops = {
+ .owner = THIS_MODULE,
+ .start = ec_wdt_start,
+ .stop = ec_wdt_stop,
+ .ping = ec_wdt_ping,
+ .set_timeout = ec_wdt_set_timeout,
+};
+
+static int adv_ec_wdt_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct device *dev = &pdev->dev;
+ struct adv_ec_platform_data *adv_ec_data;
+ struct ec_wdt_data *ec_wdt_data;
+ struct watchdog_device *wdd;
+
+ dev_info(dev, "watchdog probe start\n");
+
+ adv_ec_data = dev_get_drvdata(dev->parent);
+ if (!adv_ec_data)
+ return -EINVAL;
+
+ ec_wdt_data = devm_kzalloc(dev, sizeof(struct ec_wdt_data), GFP_KERNEL);
+ if (!ec_wdt_data)
+ return -ENOMEM;
+
+ mutex_init(&ec_wdt_data->lock_ioctl);
+
+ ec_wdt_data->adv_ec_data = adv_ec_data;
+ wdd = &ec_wdt_data->wdtdev;
+
+ watchdog_init_timeout(&ec_wdt_data->wdtdev, 0, dev);
+
+ //watchdog_set_nowayout(&ec_wdt_data->wdtdev, WATCHDOG_NOWAYOUT);
+ watchdog_set_drvdata(&ec_wdt_data->wdtdev, ec_wdt_data);
+ platform_set_drvdata(pdev, ec_wdt_data);
+
+ wdd->info = &ec_watchdog_info;
+ wdd->ops = &ec_watchdog_ops;
+ wdd->min_timeout = EC_WDT_MIN_TIMEOUT;
+ wdd->max_timeout = EC_WDT_MAX_TIMEOUT;
+ wdd->parent = dev;
+
+ ec_wdt_data->wdtdev.timeout = EC_WDT_DEFAULT_TIMEOUT;
+ ec_wdt_data->is_enable = 0;
+ ec_wdt_data->current_timeout = EC_WDT_DEFAULT_TIMEOUT;
+
+ watchdog_stop_on_unregister(wdd);
+
+ ec_wdt_data->reboot_nb.notifier_call = advwdt_notify_sys;
+ ret = devm_register_reboot_notifier(dev, &ec_wdt_data->reboot_nb);
+ if (ret) {
+ dev_err(dev, "watchdog%d: Cannot register reboot notifier (%d)\n",
+ wdd->id, ret);
+ return ret;
+ }
+
+ ret = devm_watchdog_register_device(dev, wdd);
+ if (ret != 0)
+ dev_err(dev, "watchdog_register_device() failed: %d\n",
+ ret);
+
+ dev_info(dev, "watchdog register success\n");
+
+ return 0;
+}
+
+static struct platform_driver adv_wdt_drv = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = adv_ec_wdt_probe,
+};
+module_platform_driver(adv_wdt_drv);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DESCRIPTION("Advantech Embedded Controller Watchdog Driver.");
+MODULE_AUTHOR("Campion Kang <campion.kang@advantech.com.tw>");
+MODULE_VERSION("1.0");
--
2.17.1
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