Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 177 insertions, 0 deletions

diff --git a/drivers/watchdog/ts72xx_wdt.c b/drivers/watchdog/ts72xx_wdt.c
new file mode 100644
index 000000000..bf918f5fa
--- /dev/null
+++ b/drivers/watchdog/ts72xx_wdt.c
@@ -0,0 +1,177 @@
+/*
+ * Watchdog driver for Technologic Systems TS-72xx based SBCs
+ * (TS-7200, TS-7250 and TS-7260). These boards have external
+ * glue logic CPLD chip, which includes programmable watchdog
+ * timer.
+ *
+ * Copyright (c) 2009 Mika Westerberg <mika.westerberg@iki.fi>
+ *
+ * This driver is based on ep93xx_wdt and wm831x_wdt drivers.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/watchdog.h>
+#include <linux/io.h>
+
+#define TS72XX_WDT_DEFAULT_TIMEOUT	30
+
+static int timeout;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds.");
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
+
+/* priv->control_reg */
+#define TS72XX_WDT_CTRL_DISABLE		0x00
+#define TS72XX_WDT_CTRL_250MS		0x01
+#define TS72XX_WDT_CTRL_500MS		0x02
+#define TS72XX_WDT_CTRL_1SEC		0x03
+#define TS72XX_WDT_CTRL_RESERVED	0x04
+#define TS72XX_WDT_CTRL_2SEC		0x05
+#define TS72XX_WDT_CTRL_4SEC		0x06
+#define TS72XX_WDT_CTRL_8SEC		0x07
+
+/* priv->feed_reg */
+#define TS72XX_WDT_FEED_VAL		0x05
+
+struct ts72xx_wdt_priv {
+	void __iomem	*control_reg;
+	void __iomem	*feed_reg;
+	struct watchdog_device wdd;
+	unsigned char regval;
+};
+
+static int ts72xx_wdt_start(struct watchdog_device *wdd)
+{
+	struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+	writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
+	writeb(priv->regval, priv->control_reg);
+
+	return 0;
+}
+
+static int ts72xx_wdt_stop(struct watchdog_device *wdd)
+{
+	struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+	writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
+	writeb(TS72XX_WDT_CTRL_DISABLE, priv->control_reg);
+
+	return 0;
+}
+
+static int ts72xx_wdt_ping(struct watchdog_device *wdd)
+{
+	struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+	writeb(TS72XX_WDT_FEED_VAL, priv->feed_reg);
+
+	return 0;
+}
+
+static int ts72xx_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
+{
+	struct ts72xx_wdt_priv *priv = watchdog_get_drvdata(wdd);
+
+	if (to == 1) {
+		priv->regval = TS72XX_WDT_CTRL_1SEC;
+	} else if (to == 2) {
+		priv->regval = TS72XX_WDT_CTRL_2SEC;
+	} else if (to <= 4) {
+		priv->regval = TS72XX_WDT_CTRL_4SEC;
+		to = 4;
+	} else {
+		priv->regval = TS72XX_WDT_CTRL_8SEC;
+		if (to <= 8)
+			to = 8;
+	}
+
+	wdd->timeout = to;
+
+	if (watchdog_active(wdd)) {
+		ts72xx_wdt_stop(wdd);
+		ts72xx_wdt_start(wdd);
+	}
+
+	return 0;
+}
+
+static const struct watchdog_info ts72xx_wdt_ident = {
+	.options		= WDIOF_KEEPALIVEPING |
+				  WDIOF_SETTIMEOUT |
+				  WDIOF_MAGICCLOSE,
+	.firmware_version	= 1,
+	.identity		= "TS-72XX WDT",
+};
+
+static const struct watchdog_ops ts72xx_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= ts72xx_wdt_start,
+	.stop		= ts72xx_wdt_stop,
+	.ping		= ts72xx_wdt_ping,
+	.set_timeout	= ts72xx_wdt_settimeout,
+};
+
+static int ts72xx_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ts72xx_wdt_priv *priv;
+	struct watchdog_device *wdd;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->control_reg = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->control_reg))
+		return PTR_ERR(priv->control_reg);
+
+	priv->feed_reg = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(priv->feed_reg))
+		return PTR_ERR(priv->feed_reg);
+
+	wdd = &priv->wdd;
+	wdd->info = &ts72xx_wdt_ident;
+	wdd->ops = &ts72xx_wdt_ops;
+	wdd->min_timeout = 1;
+	wdd->max_hw_heartbeat_ms = 8000;
+	wdd->parent = dev;
+
+	watchdog_set_nowayout(wdd, nowayout);
+
+	wdd->timeout = TS72XX_WDT_DEFAULT_TIMEOUT;
+	watchdog_init_timeout(wdd, timeout, dev);
+
+	watchdog_set_drvdata(wdd, priv);
+
+	ret = devm_watchdog_register_device(dev, wdd);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "TS-72xx Watchdog driver\n");
+
+	return 0;
+}
+
+static struct platform_driver ts72xx_wdt_driver = {
+	.probe		= ts72xx_wdt_probe,
+	.driver		= {
+		.name	= "ts72xx-wdt",
+	},
+};
+
+module_platform_driver(ts72xx_wdt_driver);
+
+MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
+MODULE_DESCRIPTION("TS-72xx SBC Watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ts72xx-wdt");