Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 147 insertions, 0 deletions

diff --git a/drivers/watchdog/db8500_wdt.c b/drivers/watchdog/db8500_wdt.c
new file mode 100644
index 0000000000..97148ac0aa
--- /dev/null
+++ b/drivers/watchdog/db8500_wdt.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) ST-Ericsson SA 2011-2013
+ *
+ * Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/moduleparam.h>
+#include <linux/err.h>
+#include <linux/uaccess.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/dbx500-prcmu.h>
+
+#define WATCHDOG_TIMEOUT 600 /* 10 minutes */
+
+#define WATCHDOG_MIN	0
+#define WATCHDOG_MAX28	268435  /* 28 bit resolution in ms == 268435.455 s */
+
+static unsigned int timeout = WATCHDOG_TIMEOUT;
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout,
+	"Watchdog timeout in seconds. default="
+				__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+
+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 db8500_wdt_start(struct watchdog_device *wdd)
+{
+	return prcmu_enable_a9wdog(PRCMU_WDOG_ALL);
+}
+
+static int db8500_wdt_stop(struct watchdog_device *wdd)
+{
+	return prcmu_disable_a9wdog(PRCMU_WDOG_ALL);
+}
+
+static int db8500_wdt_keepalive(struct watchdog_device *wdd)
+{
+	return prcmu_kick_a9wdog(PRCMU_WDOG_ALL);
+}
+
+static int db8500_wdt_set_timeout(struct watchdog_device *wdd,
+				 unsigned int timeout)
+{
+	db8500_wdt_stop(wdd);
+	prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
+	db8500_wdt_start(wdd);
+
+	return 0;
+}
+
+static const struct watchdog_info db8500_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+	.identity = "DB8500 WDT",
+	.firmware_version = 1,
+};
+
+static const struct watchdog_ops db8500_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = db8500_wdt_start,
+	.stop  = db8500_wdt_stop,
+	.ping  = db8500_wdt_keepalive,
+	.set_timeout = db8500_wdt_set_timeout,
+};
+
+static struct watchdog_device db8500_wdt = {
+	.info = &db8500_wdt_info,
+	.ops = &db8500_wdt_ops,
+	.min_timeout = WATCHDOG_MIN,
+	.max_timeout = WATCHDOG_MAX28,
+};
+
+static int db8500_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	timeout = 600; /* Default to 10 minutes */
+	db8500_wdt.parent = dev;
+	watchdog_set_nowayout(&db8500_wdt, nowayout);
+
+	/* disable auto off on sleep */
+	prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
+
+	/* set HW initial value */
+	prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
+
+	ret = devm_watchdog_register_device(dev, &db8500_wdt);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "initialized\n");
+
+	return 0;
+}
+
+static int db8500_wdt_suspend(struct platform_device *pdev,
+			     pm_message_t state)
+{
+	if (watchdog_active(&db8500_wdt)) {
+		db8500_wdt_stop(&db8500_wdt);
+		prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true);
+
+		prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
+		db8500_wdt_start(&db8500_wdt);
+	}
+	return 0;
+}
+
+static int db8500_wdt_resume(struct platform_device *pdev)
+{
+	if (watchdog_active(&db8500_wdt)) {
+		db8500_wdt_stop(&db8500_wdt);
+		prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
+
+		prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
+		db8500_wdt_start(&db8500_wdt);
+	}
+	return 0;
+}
+
+static struct platform_driver db8500_wdt_driver = {
+	.probe		= db8500_wdt_probe,
+	.suspend	= pm_ptr(db8500_wdt_suspend),
+	.resume		= pm_ptr(db8500_wdt_resume),
+	.driver		= {
+		.name	= "db8500_wdt",
+	},
+};
+
+module_platform_driver(db8500_wdt_driver);
+
+MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
+MODULE_DESCRIPTION("DB8500 Watchdog Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:db8500_wdt");