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Message-Id: <1445970861-19832-2-git-send-email-mans@mansr.com>
Date: Tue, 27 Oct 2015 18:34:21 +0000
From: Mans Rullgard <mans@...sr.com>
To: Wim Van Sebroeck <wim@...ana.be>, linux-kernel@...r.kernel.org,
linux-watchdog@...r.kernel.org
Cc: slash.tmp@...e.fr
Subject: [PATCH 2/2] watchdog: add support for Sigma Designs SMP86xx
This adds support for the Sigma Designs SMP86xx family built-in
watchdog.
Signed-off-by: Mans Rullgard <mans@...sr.com>
---
drivers/watchdog/Kconfig | 7 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/tangox_wdt.c | 185 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 193 insertions(+)
create mode 100644 drivers/watchdog/tangox_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 79e1aa1..0ed5ee8 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1337,6 +1337,13 @@ config RALINK_WDT
help
Hardware driver for the Ralink SoC Watchdog Timer.
+config TANGOX_WDT
+ tristate "SMP86xx watchdog"
+ select WATCHDOG_CORE
+ depends on ARCH_TANGOX
+ help
+ Watchdog driver for Sigma Designs SMP86xx.
+
# PARISC Architecture
# POWERPC Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 0c616e3..ed00796 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -148,6 +148,7 @@ octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o
obj-$(CONFIG_IMGPDC_WDT) += imgpdc_wdt.o
+obj-$(CONFIG_TANGOX_WDT) += tangox_wdt.o
# PARISC Architecture
diff --git a/drivers/watchdog/tangox_wdt.c b/drivers/watchdog/tangox_wdt.c
new file mode 100644
index 0000000..305759f
--- /dev/null
+++ b/drivers/watchdog/tangox_wdt.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2014, Mans Rullgard <mans@...sr.com>
+ * SMP86xx Watchdog driver
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/notifier.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#define DEFAULT_TIMEOUT 30
+#define MAX_TIMEOUT 120
+
+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 timeout = DEFAULT_TIMEOUT;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(watchdog_timeout, "Watchdog timeout");
+
+#define WD_COUNTER 0
+#define WD_CONFIG 4
+
+struct tangox_wdt_device {
+ struct watchdog_device wdt;
+ void __iomem *base;
+ unsigned int timeout;
+ struct clk *clk;
+ struct notifier_block restart;
+};
+
+static int tangox_wdt_ping(struct watchdog_device *wdt)
+{
+ struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt);
+
+ writel(dev->timeout, dev->base + WD_COUNTER);
+
+ return 0;
+}
+
+static int tangox_wdt_set_timeout(struct watchdog_device *wdt,
+ unsigned int new_timeout)
+{
+ struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt);
+
+ wdt->timeout = new_timeout;
+ dev->timeout = 1 + new_timeout * clk_get_rate(dev->clk);
+
+ tangox_wdt_ping(wdt);
+
+ return 0;
+}
+
+static int tangox_wdt_start(struct watchdog_device *wdt)
+{
+ return tangox_wdt_set_timeout(wdt, wdt->timeout);
+}
+
+static int tangox_wdt_stop(struct watchdog_device *wdt)
+{
+ struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt);
+
+ writel(0, dev->base + WD_COUNTER);
+
+ return 0;
+}
+
+static const struct watchdog_info tangox_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+ .identity = "tangox watchdog",
+};
+
+static const struct watchdog_ops tangox_wdt_ops = {
+ .start = tangox_wdt_start,
+ .stop = tangox_wdt_stop,
+ .ping = tangox_wdt_ping,
+ .set_timeout = tangox_wdt_set_timeout,
+};
+
+static int tangox_wdt_restart(struct notifier_block *nb, unsigned long action,
+ void *data)
+{
+ struct tangox_wdt_device *dev =
+ container_of(nb, struct tangox_wdt_device, restart);
+
+ writel(1, dev->base + WD_COUNTER);
+
+ return NOTIFY_DONE;
+}
+
+static int tangox_wdt_probe(struct platform_device *pdev)
+{
+ struct tangox_wdt_device *dev;
+ struct resource *res;
+ int err;
+
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->wdt.parent = &pdev->dev;
+ dev->wdt.info = &tangox_wdt_info;
+ dev->wdt.ops = &tangox_wdt_ops;
+ dev->wdt.timeout = timeout;
+ dev->wdt.min_timeout = 1;
+ dev->wdt.max_timeout = MAX_TIMEOUT;
+ watchdog_set_nowayout(&dev->wdt, nowayout);
+ watchdog_set_drvdata(&dev->wdt, dev);
+
+ dev->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(dev->clk))
+ return PTR_ERR(dev->clk);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ dev->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(dev->base))
+ return PTR_ERR(dev->base);
+
+ writel(0, dev->base + WD_COUNTER);
+ writel(1, dev->base + WD_CONFIG);
+
+ err = watchdog_register_device(&dev->wdt);
+ if (err)
+ return err;
+
+ platform_set_drvdata(pdev, dev);
+
+ dev->restart.notifier_call = tangox_wdt_restart;
+ dev->restart.priority = 128;
+ err = register_restart_handler(&dev->restart);
+ if (err)
+ dev_err(&pdev->dev, "failed to register restart handler\n");
+
+ dev_info(dev->wdt.dev, "SMP86xx watchdog registered\n");
+
+ return 0;
+}
+
+static int tangox_wdt_remove(struct platform_device *pdev)
+{
+ struct tangox_wdt_device *dev = platform_get_drvdata(pdev);
+
+ tangox_wdt_stop(&dev->wdt);
+ unregister_restart_handler(&dev->restart);
+ watchdog_unregister_device(&dev->wdt);
+
+ return 0;
+}
+
+static const struct of_device_id tangox_wdt_dt_ids[] = {
+ { .compatible = "sigma,smp8642-wdt" },
+ { }
+};
+
+static struct platform_driver tangox_wdt_driver = {
+ .probe = tangox_wdt_probe,
+ .remove = tangox_wdt_remove,
+ .driver = {
+ .name = "tangox-wdt",
+ .of_match_table = tangox_wdt_dt_ids,
+ },
+};
+
+module_platform_driver(tangox_wdt_driver);
+
+MODULE_AUTHOR("Mans Rullgard <mans@...sr.com>");
+MODULE_DESCRIPTION("SMP86xx Watchdog driver");
+MODULE_LICENSE("GPL");
--
2.6.2
--
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