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Diffstat (limited to 'drivers/watchdog/tqmx86_wdt.c')
-rw-r--r--drivers/watchdog/tqmx86_wdt.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/watchdog/tqmx86_wdt.c b/drivers/watchdog/tqmx86_wdt.c
new file mode 100644
index 000000000..83860e94c
--- /dev/null
+++ b/drivers/watchdog/tqmx86_wdt.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Watchdog driver for TQMx86 PLD.
+ *
+ * The watchdog supports power of 2 timeouts from 1 to 4096sec.
+ * Once started, it cannot be stopped.
+ *
+ * Based on the vendor code written by Vadim V.Vlasov
+ * <vvlasov@dev.rtsoft.ru>
+ */
+
+#include <linux/io.h>
+#include <linux/log2.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/timer.h>
+#include <linux/watchdog.h>
+
+/* default timeout (secs) */
+#define WDT_TIMEOUT 32
+
+static unsigned int timeout;
+module_param(timeout, uint, 0);
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. (1<=timeout<=4096, default="
+ __MODULE_STRING(WDT_TIMEOUT) ")");
+struct tqmx86_wdt {
+ struct watchdog_device wdd;
+ void __iomem *io_base;
+};
+
+#define TQMX86_WDCFG 0x00 /* Watchdog Configuration Register */
+#define TQMX86_WDCS 0x01 /* Watchdog Config/Status Register */
+
+static int tqmx86_wdt_start(struct watchdog_device *wdd)
+{
+ struct tqmx86_wdt *priv = watchdog_get_drvdata(wdd);
+
+ iowrite8(0x81, priv->io_base + TQMX86_WDCS);
+
+ return 0;
+}
+
+static int tqmx86_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
+{
+ struct tqmx86_wdt *priv = watchdog_get_drvdata(wdd);
+ u8 val;
+
+ t = roundup_pow_of_two(t);
+ val = ilog2(t) | 0x90;
+ val += 3; /* values 0,1,2 correspond to 0.125,0.25,0.5s timeouts */
+ iowrite8(val, priv->io_base + TQMX86_WDCFG);
+
+ wdd->timeout = t;
+
+ return 0;
+}
+
+static const struct watchdog_info tqmx86_wdt_info = {
+ .options = WDIOF_SETTIMEOUT |
+ WDIOF_KEEPALIVEPING,
+ .identity = "TQMx86 Watchdog",
+};
+
+static const struct watchdog_ops tqmx86_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = tqmx86_wdt_start,
+ .set_timeout = tqmx86_wdt_set_timeout,
+};
+
+static int tqmx86_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct tqmx86_wdt *priv;
+ struct resource *res;
+ int err;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res)
+ return -ENODEV;
+
+ priv->io_base = devm_ioport_map(dev, res->start, resource_size(res));
+ if (!priv->io_base)
+ return -ENOMEM;
+
+ watchdog_set_drvdata(&priv->wdd, priv);
+
+ priv->wdd.parent = dev;
+ priv->wdd.info = &tqmx86_wdt_info;
+ priv->wdd.ops = &tqmx86_wdt_ops;
+ priv->wdd.min_timeout = 1;
+ priv->wdd.max_timeout = 4096;
+ priv->wdd.max_hw_heartbeat_ms = 4096*1000;
+ priv->wdd.timeout = WDT_TIMEOUT;
+
+ watchdog_init_timeout(&priv->wdd, timeout, dev);
+ watchdog_set_nowayout(&priv->wdd, WATCHDOG_NOWAYOUT);
+
+ tqmx86_wdt_set_timeout(&priv->wdd, priv->wdd.timeout);
+
+ err = devm_watchdog_register_device(dev, &priv->wdd);
+ if (err)
+ return err;
+
+ dev_info(dev, "TQMx86 watchdog\n");
+
+ return 0;
+}
+
+static struct platform_driver tqmx86_wdt_driver = {
+ .driver = {
+ .name = "tqmx86-wdt",
+ },
+ .probe = tqmx86_wdt_probe,
+};
+
+module_platform_driver(tqmx86_wdt_driver);
+
+MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
+MODULE_DESCRIPTION("TQMx86 Watchdog");
+MODULE_ALIAS("platform:tqmx86-wdt");
+MODULE_LICENSE("GPL");