Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 243 insertions, 0 deletions

diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c
new file mode 100644
index 000000000..05425c1df
--- /dev/null
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Watchdog driver for Broadcom BCM47XX
+ *
+ *  Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
+ *  Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
+ *  Copyright (C) 2012-2013 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/bcm47xx_wdt.h>
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+
+#define DRV_NAME		"bcm47xx_wdt"
+
+#define WDT_DEFAULT_TIME	30	/* seconds */
+#define WDT_SOFTTIMER_MAX	255	/* seconds */
+#define WDT_SOFTTIMER_THRESHOLD	60	/* seconds */
+
+static int timeout = WDT_DEFAULT_TIME;
+static bool nowayout = WATCHDOG_NOWAYOUT;
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default="
+				__MODULE_STRING(WDT_DEFAULT_TIME) ")");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd)
+{
+	return container_of(wdd, struct bcm47xx_wdt, wdd);
+}
+
+static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd)
+{
+	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+	wdt->timer_set_ms(wdt, wdd->timeout * 1000);
+
+	return 0;
+}
+
+static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd)
+{
+	return 0;
+}
+
+static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd)
+{
+	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+	wdt->timer_set(wdt, 0);
+
+	return 0;
+}
+
+static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
+					unsigned int new_time)
+{
+	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+	u32 max_timer = wdt->max_timer_ms;
+
+	if (new_time < 1 || new_time > max_timer / 1000) {
+		pr_warn("timeout value must be 1<=x<=%d, using %d\n",
+			max_timer / 1000, new_time);
+		return -EINVAL;
+	}
+
+	wdd->timeout = new_time;
+	return 0;
+}
+
+static int bcm47xx_wdt_restart(struct watchdog_device *wdd,
+			       unsigned long action, void *data)
+{
+	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+	wdt->timer_set(wdt, 1);
+
+	return 0;
+}
+
+static const struct watchdog_ops bcm47xx_wdt_hard_ops = {
+	.owner		= THIS_MODULE,
+	.start		= bcm47xx_wdt_hard_start,
+	.stop		= bcm47xx_wdt_hard_stop,
+	.ping		= bcm47xx_wdt_hard_keepalive,
+	.set_timeout	= bcm47xx_wdt_hard_set_timeout,
+	.restart        = bcm47xx_wdt_restart,
+};
+
+static void bcm47xx_wdt_soft_timer_tick(struct timer_list *t)
+{
+	struct bcm47xx_wdt *wdt = from_timer(wdt, t, soft_timer);
+	u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms);
+
+	if (!atomic_dec_and_test(&wdt->soft_ticks)) {
+		wdt->timer_set_ms(wdt, next_tick);
+		mod_timer(&wdt->soft_timer, jiffies + HZ);
+	} else {
+		pr_crit("Watchdog will fire soon!!!\n");
+	}
+}
+
+static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd)
+{
+	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+	atomic_set(&wdt->soft_ticks, wdd->timeout);
+
+	return 0;
+}
+
+static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd)
+{
+	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+	bcm47xx_wdt_soft_keepalive(wdd);
+	bcm47xx_wdt_soft_timer_tick(&wdt->soft_timer);
+
+	return 0;
+}
+
+static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd)
+{
+	struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+	del_timer_sync(&wdt->soft_timer);
+	wdt->timer_set(wdt, 0);
+
+	return 0;
+}
+
+static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd,
+					unsigned int new_time)
+{
+	if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) {
+		pr_warn("timeout value must be 1<=x<=%d, using %d\n",
+			WDT_SOFTTIMER_MAX, new_time);
+		return -EINVAL;
+	}
+
+	wdd->timeout = new_time;
+	return 0;
+}
+
+static const struct watchdog_info bcm47xx_wdt_info = {
+	.identity	= DRV_NAME,
+	.options	= WDIOF_SETTIMEOUT |
+				WDIOF_KEEPALIVEPING |
+				WDIOF_MAGICCLOSE,
+};
+
+static const struct watchdog_ops bcm47xx_wdt_soft_ops = {
+	.owner		= THIS_MODULE,
+	.start		= bcm47xx_wdt_soft_start,
+	.stop		= bcm47xx_wdt_soft_stop,
+	.ping		= bcm47xx_wdt_soft_keepalive,
+	.set_timeout	= bcm47xx_wdt_soft_set_timeout,
+	.restart        = bcm47xx_wdt_restart,
+};
+
+static int bcm47xx_wdt_probe(struct platform_device *pdev)
+{
+	int ret;
+	bool soft;
+	struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
+
+	if (!wdt)
+		return -ENXIO;
+
+	soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000;
+
+	if (soft) {
+		wdt->wdd.ops = &bcm47xx_wdt_soft_ops;
+		timer_setup(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick, 0);
+	} else {
+		wdt->wdd.ops = &bcm47xx_wdt_hard_ops;
+	}
+
+	wdt->wdd.info = &bcm47xx_wdt_info;
+	wdt->wdd.timeout = WDT_DEFAULT_TIME;
+	wdt->wdd.parent = &pdev->dev;
+	ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout);
+	if (ret)
+		goto err_timer;
+	watchdog_set_nowayout(&wdt->wdd, nowayout);
+	watchdog_set_restart_priority(&wdt->wdd, 64);
+	watchdog_stop_on_reboot(&wdt->wdd);
+
+	ret = watchdog_register_device(&wdt->wdd);
+	if (ret)
+		goto err_timer;
+
+	dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
+		timeout, nowayout ? ", nowayout" : "",
+		soft ? ", Software Timer" : "");
+	return 0;
+
+err_timer:
+	if (soft)
+		del_timer_sync(&wdt->soft_timer);
+
+	return ret;
+}
+
+static int bcm47xx_wdt_remove(struct platform_device *pdev)
+{
+	struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
+
+	watchdog_unregister_device(&wdt->wdd);
+
+	return 0;
+}
+
+static struct platform_driver bcm47xx_wdt_driver = {
+	.driver		= {
+		.name	= "bcm47xx-wdt",
+	},
+	.probe		= bcm47xx_wdt_probe,
+	.remove		= bcm47xx_wdt_remove,
+};
+
+module_platform_driver(bcm47xx_wdt_driver);
+
+MODULE_AUTHOR("Aleksandar Radovanovic");
+MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
+MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
+MODULE_LICENSE("GPL");