Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 200 insertions, 0 deletions

diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
new file mode 100644
index 0000000000..395bde79e2
--- /dev/null
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -0,0 +1,200 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Copyright (C) 2010, Paul Cercueil <paul@crapouillou.net>
+ *  JZ4740 Watchdog driver
+ */
+
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#define DEFAULT_HEARTBEAT 5
+#define MAX_HEARTBEAT     2048
+
+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 unsigned int heartbeat = DEFAULT_HEARTBEAT;
+module_param(heartbeat, uint, 0);
+MODULE_PARM_DESC(heartbeat,
+		"Watchdog heartbeat period in seconds from 1 to "
+		__MODULE_STRING(MAX_HEARTBEAT) ", default "
+		__MODULE_STRING(DEFAULT_HEARTBEAT));
+
+struct jz4740_wdt_drvdata {
+	struct watchdog_device wdt;
+	struct regmap *map;
+	struct clk *clk;
+	unsigned long clk_rate;
+};
+
+static int jz4740_wdt_ping(struct watchdog_device *wdt_dev)
+{
+	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
+
+	return 0;
+}
+
+static int jz4740_wdt_set_timeout(struct watchdog_device *wdt_dev,
+				    unsigned int new_timeout)
+{
+	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+	u16 timeout_value = (u16)(drvdata->clk_rate * new_timeout);
+	unsigned int tcer;
+
+	regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
+	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
+
+	regmap_write(drvdata->map, TCU_REG_WDT_TDR, timeout_value);
+	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
+
+	if (tcer & TCU_WDT_TCER_TCEN)
+		regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
+
+	wdt_dev->timeout = new_timeout;
+	return 0;
+}
+
+static int jz4740_wdt_start(struct watchdog_device *wdt_dev)
+{
+	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+	unsigned int tcer;
+	int ret;
+
+	ret = clk_prepare_enable(drvdata->clk);
+	if (ret)
+		return ret;
+
+	regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
+
+	jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+
+	/* Start watchdog if it wasn't started already */
+	if (!(tcer & TCU_WDT_TCER_TCEN))
+		regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
+
+	return 0;
+}
+
+static int jz4740_wdt_stop(struct watchdog_device *wdt_dev)
+{
+	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+
+	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
+	clk_disable_unprepare(drvdata->clk);
+
+	return 0;
+}
+
+static int jz4740_wdt_restart(struct watchdog_device *wdt_dev,
+			      unsigned long action, void *data)
+{
+	wdt_dev->timeout = 0;
+	jz4740_wdt_start(wdt_dev);
+	return 0;
+}
+
+static const struct watchdog_info jz4740_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+	.identity = "jz4740 Watchdog",
+};
+
+static const struct watchdog_ops jz4740_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = jz4740_wdt_start,
+	.stop = jz4740_wdt_stop,
+	.ping = jz4740_wdt_ping,
+	.set_timeout = jz4740_wdt_set_timeout,
+	.restart = jz4740_wdt_restart,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id jz4740_wdt_of_matches[] = {
+	{ .compatible = "ingenic,jz4740-watchdog", },
+	{ .compatible = "ingenic,jz4780-watchdog", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches);
+#endif
+
+static int jz4740_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct jz4740_wdt_drvdata *drvdata;
+	struct watchdog_device *jz4740_wdt;
+	long rate;
+	int ret;
+
+	drvdata = devm_kzalloc(dev, sizeof(struct jz4740_wdt_drvdata),
+			       GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	drvdata->clk = devm_clk_get(&pdev->dev, "wdt");
+	if (IS_ERR(drvdata->clk)) {
+		dev_err(&pdev->dev, "cannot find WDT clock\n");
+		return PTR_ERR(drvdata->clk);
+	}
+
+	/* Set smallest clock possible */
+	rate = clk_round_rate(drvdata->clk, 1);
+	if (rate < 0)
+		return rate;
+
+	ret = clk_set_rate(drvdata->clk, rate);
+	if (ret)
+		return ret;
+
+	drvdata->clk_rate = rate;
+	jz4740_wdt = &drvdata->wdt;
+	jz4740_wdt->info = &jz4740_wdt_info;
+	jz4740_wdt->ops = &jz4740_wdt_ops;
+	jz4740_wdt->min_timeout = 1;
+	jz4740_wdt->max_timeout = 0xffff / rate;
+	jz4740_wdt->timeout = clamp(heartbeat,
+				    jz4740_wdt->min_timeout,
+				    jz4740_wdt->max_timeout);
+	jz4740_wdt->parent = dev;
+	watchdog_set_nowayout(jz4740_wdt, nowayout);
+	watchdog_set_drvdata(jz4740_wdt, drvdata);
+
+	drvdata->map = device_node_to_regmap(dev->parent->of_node);
+	if (IS_ERR(drvdata->map)) {
+		dev_err(dev, "regmap not found\n");
+		return PTR_ERR(drvdata->map);
+	}
+
+	return devm_watchdog_register_device(dev, &drvdata->wdt);
+}
+
+static struct platform_driver jz4740_wdt_driver = {
+	.probe = jz4740_wdt_probe,
+	.driver = {
+		.name = "jz4740-wdt",
+		.of_match_table = of_match_ptr(jz4740_wdt_of_matches),
+	},
+};
+
+module_platform_driver(jz4740_wdt_driver);
+
+MODULE_AUTHOR("Paul Cercueil <paul@crapouillou.net>");
+MODULE_DESCRIPTION("jz4740 Watchdog Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:jz4740-wdt");