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Message-Id: <20161102083751.6335-7-richard.dorsch@gmail.com>
Date: Wed, 2 Nov 2016 01:37:51 -0700
From: Richard Vidal-Dorsch <richard.dorsch@...il.com>
To: linus.walleij@...aro.org, gnurou@...il.com, jdelvare@...e.com,
linux@...ck-us.net, wsa@...-dreams.de, lee.jones@...aro.org,
jingoohan1@...il.com, tomi.valkeinen@...com, wim@...ana.be,
linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-fbdev@...r.kernel.org, linux-watchdog@...r.kernel.org,
k.kozlowski@...sung.com
Cc: Richard Vidal-Dorsch <richard.dorsch@...il.com>,
jo.sunga@...antech.com, weilun.huang@...antech.com,
andrew.chou@...antech.com
Subject: [PATCH v4 6/6] Add Advantech iManager Watchdog driver
Signed-off-by: Richard Vidal-Dorsch <richard.dorsch@...il.com>
---
drivers/watchdog/Kconfig | 11 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/imanager_wdt.c | 303 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 315 insertions(+)
create mode 100644 drivers/watchdog/imanager_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index fdd3228..d6859da 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -912,6 +912,17 @@ config WAFER_WDT
To compile this driver as a module, choose M here: the
module will be called wafer5823wdt.
+config IMANAGER_WDT
+ tristate "Advantech iManager Watchdog"
+ depends on MFD_IMANAGER
+ select WATCHDOG_CORE
+ help
+ Support for Advantech iManager watchdog on some Advantech
+ SOM, MIO, AIMB, and PCM modules/boards.
+
+ This driver can also be built as a module. If so, the module
+ will be called imanager_wdt.
+
config I6300ESB_WDT
tristate "Intel 6300ESB Timer/Watchdog"
depends on PCI
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index caa9f4a..eb7fccf 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -117,6 +117,7 @@ endif
obj-$(CONFIG_IT8712F_WDT) += it8712f_wdt.o
obj-$(CONFIG_IT87_WDT) += it87_wdt.o
obj-$(CONFIG_HP_WATCHDOG) += hpwdt.o
+obj-$(CONFIG_IMANAGER_WDT) += imanager_wdt.o
obj-$(CONFIG_KEMPLD_WDT) += kempld_wdt.o
obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
diff --git a/drivers/watchdog/imanager_wdt.c b/drivers/watchdog/imanager_wdt.c
new file mode 100644
index 0000000..53b409e
--- /dev/null
+++ b/drivers/watchdog/imanager_wdt.c
@@ -0,0 +1,303 @@
+/*
+ * Advantech iManager Watchdog driver
+ *
+ * Copyright (C) 2016 Advantech Co., Ltd.
+ * Author: Richard Vidal-Dorsch <richard.dorsch@...antech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/bitops.h>
+#include <linux/byteorder/generic.h>
+#include <linux/device.h>
+#include <linux/mfd/imanager.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+#define WDT_DEFAULT_TIMEOUT 30 /* seconds */
+#define WDT_FREQ 10 /* Hz */
+
+struct imanager_wdt_data {
+ struct imanager_device_data *imgr;
+ struct watchdog_device wdt;
+ ulong last_updated;
+ uint timeout;
+};
+
+static uint timeout = WDT_DEFAULT_TIMEOUT;
+module_param(timeout, uint, 0444);
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 1 <= timeout <= 65534, default="
+ __MODULE_STRING(WDT_DEFAULT_TIMEOUT) ".");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0444);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+enum wdt_ctrl {
+ START = 1, STOP, RESET, GET_TIMEOUT, SET_TIMEOUT, STOPBOOT = 8
+};
+
+enum imanager_wdt_event {
+ WDT_EVT_NONE,
+ WDT_EVT_DELAY,
+ WDT_EVT_PWRBTN,
+ WDT_EVT_NMI,
+ WDT_EVT_RESET,
+ WDT_EVT_WDPIN,
+ WDT_EVT_SCI,
+};
+
+struct event_delay {
+ u16 delay,
+ pwrbtn,
+ nmi,
+ reset,
+ wdpin,
+ sci,
+ dummy;
+} __attribute__((__packed__));
+
+static int imanager_wdt_ctrl(struct imanager_ec_data *ec, int ctrl,
+ int event_type, uint timeout)
+{
+ struct imanager_ec_message msg = {
+ IMANAGER_MSG_SIMPLE(0, 0, ctrl, NULL)
+ };
+ u8 *fevent = &msg.u.data[0];
+ struct event_delay *event = (struct event_delay *)&msg.u.data[1];
+ int val;
+
+ if (ctrl == SET_TIMEOUT) {
+ memset(event, 0xff, sizeof(*event));
+ msg.wlen = sizeof(*event);
+ *fevent = 0;
+ val = (!timeout) ? 0xffff : cpu_to_be16(timeout * WDT_FREQ);
+
+ switch (event_type) {
+ case WDT_EVT_DELAY:
+ event->delay = val;
+ break;
+ case WDT_EVT_PWRBTN:
+ event->pwrbtn = val;
+ break;
+ case WDT_EVT_NMI:
+ event->nmi = val;
+ break;
+ case WDT_EVT_RESET:
+ event->reset = val;
+ break;
+ case WDT_EVT_WDPIN:
+ event->wdpin = val;
+ break;
+ case WDT_EVT_SCI:
+ event->sci = val;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return imanager_write(ec, EC_CMD_WDT_CTRL, &msg);
+}
+
+static inline int imanager_wdt_disable_all(struct imanager_wdt_data *data)
+{
+ struct imanager_ec_data *ec = &data->imgr->ec;
+
+ return (imanager_wdt_ctrl(ec, STOP, WDT_EVT_NONE, 0) ||
+ imanager_wdt_ctrl(ec, STOPBOOT, WDT_EVT_NONE, 0));
+}
+
+static int imanager_wdt_set(struct imanager_wdt_data *data, uint timeout)
+{
+ struct imanager_ec_data *ec = &data->imgr->ec;
+ int ret;
+
+ if (time_before(jiffies, data->last_updated + HZ + HZ / 2))
+ return 0;
+
+ if (data->timeout == timeout)
+ return 0;
+
+ ret = imanager_wdt_ctrl(ec, SET_TIMEOUT, WDT_EVT_PWRBTN, timeout);
+ if (ret < 0)
+ return ret;
+
+ data->timeout = timeout;
+ data->last_updated = jiffies;
+
+ return 0;
+}
+
+static int imanager_wdt_set_timeout(struct watchdog_device *wdt, uint timeout)
+{
+ struct imanager_wdt_data *data = watchdog_get_drvdata(wdt);
+ struct imanager_device_data *imgr = data->imgr;
+ int ret;
+
+ mutex_lock(&imgr->lock);
+ ret = imanager_wdt_set(data, timeout);
+ mutex_unlock(&imgr->lock);
+
+ return ret;
+}
+
+static uint imanager_wdt_get_timeleft(struct watchdog_device *wdt)
+{
+ struct imanager_wdt_data *data = watchdog_get_drvdata(wdt);
+ uint timeleft = 0;
+ ulong time_diff = ((jiffies - data->last_updated) / HZ);
+
+ if (data->last_updated && (data->timeout > time_diff))
+ timeleft = data->timeout - time_diff;
+
+ return timeleft;
+}
+
+static int imanager_wdt_start(struct watchdog_device *wdt)
+{
+ struct imanager_wdt_data *data = watchdog_get_drvdata(wdt);
+ struct imanager_device_data *imgr = data->imgr;
+ int ret;
+
+ mutex_lock(&imgr->lock);
+ ret = imanager_wdt_ctrl(&imgr->ec, START, WDT_EVT_NONE, 0);
+ data->last_updated = jiffies;
+ mutex_unlock(&imgr->lock);
+
+ return ret;
+}
+
+static int imanager_wdt_stop(struct watchdog_device *wdt)
+{
+ struct imanager_wdt_data *data = watchdog_get_drvdata(wdt);
+ struct imanager_device_data *imgr = data->imgr;
+ int ret;
+
+ mutex_lock(&imgr->lock);
+ ret = imanager_wdt_ctrl(&imgr->ec, STOP, WDT_EVT_NONE, 0);
+ data->last_updated = 0;
+ mutex_unlock(&imgr->lock);
+
+ return ret;
+}
+
+static int imanager_wdt_ping(struct watchdog_device *wdt)
+{
+ struct imanager_wdt_data *data = watchdog_get_drvdata(wdt);
+ struct imanager_device_data *imgr = data->imgr;
+ int ret;
+
+ mutex_lock(&imgr->lock);
+ ret = imanager_wdt_ctrl(&imgr->ec, RESET, WDT_EVT_NONE, 0);
+ data->last_updated = jiffies;
+ mutex_unlock(&imgr->lock);
+
+ return ret;
+}
+
+static const struct watchdog_info imanager_wdt_info = {
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+ .firmware_version = 0,
+ .identity = "imanager-wdt",
+};
+
+static const struct watchdog_ops imanager_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = imanager_wdt_start,
+ .stop = imanager_wdt_stop,
+ .ping = imanager_wdt_ping,
+ .set_timeout = imanager_wdt_set_timeout,
+ .get_timeleft = imanager_wdt_get_timeleft,
+};
+
+static int imanager_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imanager_device_data *imgr = dev_get_drvdata(dev->parent);
+ struct imanager_wdt_data *data;
+ struct watchdog_device *wdt_dev;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->imgr = imgr;
+
+ wdt_dev = &data->wdt;
+ wdt_dev->info = &imanager_wdt_info;
+ wdt_dev->ops = &imanager_wdt_ops;
+ wdt_dev->timeout = WDT_DEFAULT_TIMEOUT;
+ wdt_dev->min_timeout = 1;
+ wdt_dev->max_timeout = 0xfffe;
+
+ watchdog_set_nowayout(wdt_dev, nowayout);
+ watchdog_set_drvdata(wdt_dev, data);
+
+ ret = watchdog_register_device(wdt_dev);
+ if (ret) {
+ dev_err(dev, "Could not register watchdog device\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, data);
+
+ imanager_wdt_disable_all(data);
+ imanager_wdt_set_timeout(wdt_dev, timeout);
+
+ dev_info(dev, "Driver loaded (timeout=%d seconds)\n", timeout);
+
+ return 0;
+}
+
+static int imanager_wdt_remove(struct platform_device *pdev)
+{
+ struct imanager_wdt_data *data = platform_get_drvdata(pdev);
+
+ if (!nowayout)
+ imanager_wdt_disable_all(data);
+
+ watchdog_unregister_device(&data->wdt);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static void imanager_wdt_shutdown(struct platform_device *pdev)
+{
+ struct imanager_device_data *imgr = dev_get_drvdata(pdev->dev.parent);
+
+ mutex_lock(&imgr->lock);
+ imanager_wdt_ctrl(&imgr->ec, STOP, WDT_EVT_NONE, 0);
+ mutex_unlock(&imgr->lock);
+}
+
+static struct platform_driver imanager_wdt_driver = {
+ .driver = {
+ .name = "imanager-wdt",
+ },
+ .probe = imanager_wdt_probe,
+ .remove = imanager_wdt_remove,
+ .shutdown = imanager_wdt_shutdown,
+};
+
+module_platform_driver(imanager_wdt_driver);
+
+MODULE_DESCRIPTION("Advantech iManager Watchdog Driver");
+MODULE_AUTHOR("Richard Vidal-Dorsch <richard.dorsch at advantech.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imanager-wdt");
--
2.10.1
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