Re: [PATCH v2 3/4] watchdog: introduce retu_wdt driver
* Aaro Koskinen [121031 11:10]:
> Introduce Retu watchdog driver.
Added Wim Van Sebroeck to cc so he knows to
pick up the patches after no more comments. You may need
to resend.
Regards,
Tony
> Cc: linux-watch...@vger.kernel.org
> Acked-by: Felipe Balbi
> Acked-by: Tony Lindgren
> Signed-off-by: Aaro Koskinen
> ---
> drivers/watchdog/Kconfig| 12 +++
> drivers/watchdog/Makefile |1 +
> drivers/watchdog/retu_wdt.c | 178
> +++
> 3 files changed, 191 insertions(+), 0 deletions(-)
> create mode 100644 drivers/watchdog/retu_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index ad1bb93..c3a836d 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -352,6 +352,18 @@ config IMX2_WDT
> To compile this driver as a module, choose M here: the
> module will be called imx2_wdt.
>
> +config RETU_WATCHDOG
> + tristate "Retu watchdog"
> + depends on MFD_RETU
> + select WATCHDOG_CORE
> + help
> + Retu watchdog driver for Nokia Internet Tablets (700, N800,
> + N810). At least on N800 the watchdog cannot be disabled, so
> + this driver is essential and you should enable it.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called retu_wdt.
> +
> # AVR32 Architecture
>
> config AT32AP700X_WDT
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 572b39b..d2f1c0c 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -52,6 +52,7 @@ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
> obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
> obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
> obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
> +obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
>
> # AVR32 Architecture
> obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
> diff --git a/drivers/watchdog/retu_wdt.c b/drivers/watchdog/retu_wdt.c
> new file mode 100644
> index 000..aeb0f39
> --- /dev/null
> +++ b/drivers/watchdog/retu_wdt.c
> @@ -0,0 +1,178 @@
> +/*
> + * Retu watchdog driver
> + *
> + * Copyright (C) 2004, 2005 Nokia Corporation
> + *
> + * Based on code written by Amit Kucheria and Michael Buesch.
> + * Rewritten by Aaro Koskinen.
> + *
> + * This file is subject to the terms and conditions of the GNU General
> + * Public License. See the file "COPYING" in the main directory of this
> + * archive for more details.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +
> +/* Watchdog timer values in seconds */
> +#define RETU_WDT_MAX_TIMER 63
> +
> +struct retu_wdt_dev {
> + struct retu_dev *rdev;
> + struct device *dev;
> + struct delayed_work ping_work;
> +};
> +
> +/*
> + * Since Retu watchdog cannot be disabled in hardware, we must kick it
> + * with a timer until userspace watchdog software takes over. If
> + * CONFIG_WATCHDOG_NOWAYOUT is set, we never start the feeding.
> + */
> +static void retu_wdt_ping_enable(struct retu_wdt_dev *wdev)
> +{
> + retu_write(wdev->rdev, RETU_REG_WATCHDOG, RETU_WDT_MAX_TIMER);
> + schedule_delayed_work(&wdev->ping_work,
> + round_jiffies_relative(RETU_WDT_MAX_TIMER * HZ / 2));
> +}
> +
> +static void retu_wdt_ping_disable(struct retu_wdt_dev *wdev)
> +{
> + retu_write(wdev->rdev, RETU_REG_WATCHDOG, RETU_WDT_MAX_TIMER);
> + cancel_delayed_work_sync(&wdev->ping_work);
> +}
> +
> +static void retu_wdt_ping_work(struct work_struct *work)
> +{
> + struct retu_wdt_dev *wdev = container_of(to_delayed_work(work),
> + struct retu_wdt_dev, ping_work);
> + retu_wdt_ping_enable(wdev);
> +}
> +
> +static int retu_wdt_start(struct watchdog_device *wdog)
> +{
> + struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
> +
> + retu_wdt_ping_disable(wdev);
> +
> + return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
> +}
> +
> +static int retu_wdt_stop(struct watchdog_device *wdog)
> +{
> + struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
> +
> + retu_wdt_ping_enable(wdev);
> +
> + return 0;
> +}
> +
> +static int retu_wdt_ping(struct watchdog_device *wdog)
> +{
> + struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
> +
> + return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
> +}
> +
> +static int retu_wdt_set_timeout(struct watchdog_device *wdog,
> + unsigned int timeout)
> +{
> + struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
> +
> + wdog->timeout = timeout;
> + return retu_write(wdev
[PATCH v2 3/4] watchdog: introduce retu_wdt driver
Introduce Retu watchdog driver.
Cc: linux-watch...@vger.kernel.org
Acked-by: Felipe Balbi
Acked-by: Tony Lindgren
Signed-off-by: Aaro Koskinen
---
drivers/watchdog/Kconfig| 12 +++
drivers/watchdog/Makefile |1 +
drivers/watchdog/retu_wdt.c | 178 +++
3 files changed, 191 insertions(+), 0 deletions(-)
create mode 100644 drivers/watchdog/retu_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index ad1bb93..c3a836d 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -352,6 +352,18 @@ config IMX2_WDT
To compile this driver as a module, choose M here: the
module will be called imx2_wdt.
+config RETU_WATCHDOG
+ tristate "Retu watchdog"
+ depends on MFD_RETU
+ select WATCHDOG_CORE
+ help
+ Retu watchdog driver for Nokia Internet Tablets (700, N800,
+ N810). At least on N800 the watchdog cannot be disabled, so
+ this driver is essential and you should enable it.
+
+ To compile this driver as a module, choose M here: the
+ module will be called retu_wdt.
+
# AVR32 Architecture
config AT32AP700X_WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 572b39b..d2f1c0c 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o
obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
+obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o
# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/retu_wdt.c b/drivers/watchdog/retu_wdt.c
new file mode 100644
index 000..aeb0f39
--- /dev/null
+++ b/drivers/watchdog/retu_wdt.c
@@ -0,0 +1,178 @@
+/*
+ * Retu watchdog driver
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Based on code written by Amit Kucheria and Michael Buesch.
+ * Rewritten by Aaro Koskinen.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+/* Watchdog timer values in seconds */
+#define RETU_WDT_MAX_TIMER 63
+
+struct retu_wdt_dev {
+ struct retu_dev *rdev;
+ struct device *dev;
+ struct delayed_work ping_work;
+};
+
+/*
+ * Since Retu watchdog cannot be disabled in hardware, we must kick it
+ * with a timer until userspace watchdog software takes over. If
+ * CONFIG_WATCHDOG_NOWAYOUT is set, we never start the feeding.
+ */
+static void retu_wdt_ping_enable(struct retu_wdt_dev *wdev)
+{
+ retu_write(wdev->rdev, RETU_REG_WATCHDOG, RETU_WDT_MAX_TIMER);
+ schedule_delayed_work(&wdev->ping_work,
+ round_jiffies_relative(RETU_WDT_MAX_TIMER * HZ / 2));
+}
+
+static void retu_wdt_ping_disable(struct retu_wdt_dev *wdev)
+{
+ retu_write(wdev->rdev, RETU_REG_WATCHDOG, RETU_WDT_MAX_TIMER);
+ cancel_delayed_work_sync(&wdev->ping_work);
+}
+
+static void retu_wdt_ping_work(struct work_struct *work)
+{
+ struct retu_wdt_dev *wdev = container_of(to_delayed_work(work),
+ struct retu_wdt_dev, ping_work);
+ retu_wdt_ping_enable(wdev);
+}
+
+static int retu_wdt_start(struct watchdog_device *wdog)
+{
+ struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
+
+ retu_wdt_ping_disable(wdev);
+
+ return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
+}
+
+static int retu_wdt_stop(struct watchdog_device *wdog)
+{
+ struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
+
+ retu_wdt_ping_enable(wdev);
+
+ return 0;
+}
+
+static int retu_wdt_ping(struct watchdog_device *wdog)
+{
+ struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
+
+ return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
+}
+
+static int retu_wdt_set_timeout(struct watchdog_device *wdog,
+ unsigned int timeout)
+{
+ struct retu_wdt_dev *wdev = watchdog_get_drvdata(wdog);
+
+ wdog->timeout = timeout;
+ return retu_write(wdev->rdev, RETU_REG_WATCHDOG, wdog->timeout);
+}
+
+static const struct watchdog_info retu_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+ .identity = "Retu watchdog",
+};
+
+static const struct watchdog_ops retu_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = retu_wdt_start,
+ .stop = retu_wdt_stop,
+ .ping
