1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/watchdog/twl4030_wdt.c b/drivers/watchdog/twl4030_wdt.c
new file mode 100644
index 000000000..09d17e20f
--- /dev/null
+++ b/drivers/watchdog/twl4030_wdt.c
@@ -0,0 +1,123 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) Nokia Corporation
+ *
+ * Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/twl.h>
+
+#define TWL4030_WATCHDOG_CFG_REG_OFFS	0x3
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
+	"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int twl4030_wdt_write(unsigned char val)
+{
+	return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
+					TWL4030_WATCHDOG_CFG_REG_OFFS);
+}
+
+static int twl4030_wdt_start(struct watchdog_device *wdt)
+{
+	return twl4030_wdt_write(wdt->timeout + 1);
+}
+
+static int twl4030_wdt_stop(struct watchdog_device *wdt)
+{
+	return twl4030_wdt_write(0);
+}
+
+static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
+				   unsigned int timeout)
+{
+	wdt->timeout = timeout;
+	return 0;
+}
+
+static const struct watchdog_info twl4030_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
+	.identity = "TWL4030 Watchdog",
+};
+
+static const struct watchdog_ops twl4030_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= twl4030_wdt_start,
+	.stop		= twl4030_wdt_stop,
+	.set_timeout	= twl4030_wdt_set_timeout,
+};
+
+static int twl4030_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct watchdog_device *wdt;
+
+	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+	if (!wdt)
+		return -ENOMEM;
+
+	wdt->info		= &twl4030_wdt_info;
+	wdt->ops		= &twl4030_wdt_ops;
+	wdt->status		= 0;
+	wdt->timeout		= 30;
+	wdt->min_timeout	= 1;
+	wdt->max_timeout	= 30;
+	wdt->parent = dev;
+
+	watchdog_set_nowayout(wdt, nowayout);
+	platform_set_drvdata(pdev, wdt);
+
+	twl4030_wdt_stop(wdt);
+
+	return devm_watchdog_register_device(dev, wdt);
+}
+
+static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct watchdog_device *wdt = platform_get_drvdata(pdev);
+	if (watchdog_active(wdt))
+		return twl4030_wdt_stop(wdt);
+
+	return 0;
+}
+
+static int twl4030_wdt_resume(struct platform_device *pdev)
+{
+	struct watchdog_device *wdt = platform_get_drvdata(pdev);
+	if (watchdog_active(wdt))
+		return twl4030_wdt_start(wdt);
+
+	return 0;
+}
+
+static const struct of_device_id twl_wdt_of_match[] = {
+	{ .compatible = "ti,twl4030-wdt", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
+
+static struct platform_driver twl4030_wdt_driver = {
+	.probe		= twl4030_wdt_probe,
+	.suspend	= pm_ptr(twl4030_wdt_suspend),
+	.resume		= pm_ptr(twl4030_wdt_resume),
+	.driver		= {
+		.name		= "twl4030_wdt",
+		.of_match_table	= twl_wdt_of_match,
+	},
+};
+
+module_platform_driver(twl4030_wdt_driver);
+
+MODULE_AUTHOR("Nokia Corporation");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:twl4030_wdt");
+