watchdog: Add DA9063 PMIC watchdog driver.

This driver supports the watchdog device inside the DA9063 PMIC.

Signed-off-by: Krystian Garbaciak <krystian.garbaciak@diasemi.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Tested-by: Steve Twiss <stwiss.opensource@diasemi.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 4edae08..a51ccf3 100644 (file)
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -87,6 +87,15 @@ config DA9055_WATCHDOG
          This driver can also be built as a module.  If so, the module
          will be called da9055_wdt.
 
+config DA9063_WATCHDOG
+       tristate "Dialog DA9063 Watchdog"
+       depends on MFD_DA9063
+       select WATCHDOG_CORE
+       help
+         Support for the watchdog in the DA9063 PMIC.
+
+         This driver can be built as a module. The module name is da9063_wdt.
+
 config GPIO_WATCHDOG
        tristate "Watchdog device controlled through GPIO-line"
        depends on OF_GPIO

diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index f105999..f8eaaf4 100644 (file)
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -176,6 +176,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
 # Architecture Independent
 obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
 obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
+obj-$(CONFIG_DA9063_WATCHDOG) += da9063_wdt.o
 obj-$(CONFIG_GPIO_WATCHDOG)    += gpio_wdt.o
 obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
 obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o

diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
new file mode 100644 (file)
index 0000000..2cd6b2c
--- /dev/null
+++ b/drivers/watchdog/da9063_wdt.c
@@ -0,0 +1,191 @@
+/*
+ * Watchdog driver for DA9063 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
+ *
+ * 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/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/mfd/da9063/registers.h>
+#include <linux/mfd/da9063/core.h>
+#include <linux/regmap.h>
+
+/*
+ * Watchdog selector to timeout in seconds.
+ *   0: WDT disabled;
+ *   others: timeout = 2048 ms * 2^(TWDSCALE-1).
+ */
+static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
+#define DA9063_TWDSCALE_DISABLE                0
+#define DA9063_TWDSCALE_MIN            1
+#define DA9063_TWDSCALE_MAX            (ARRAY_SIZE(wdt_timeout) - 1)
+#define DA9063_WDT_MIN_TIMEOUT         wdt_timeout[DA9063_TWDSCALE_MIN]
+#define DA9063_WDT_MAX_TIMEOUT         wdt_timeout[DA9063_TWDSCALE_MAX]
+#define DA9063_WDG_TIMEOUT             wdt_timeout[3]
+
+struct da9063_watchdog {
+       struct da9063 *da9063;
+       struct watchdog_device wdtdev;
+};
+
+static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
+{
+       unsigned int i;
+
+       for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
+               if (wdt_timeout[i] >= secs)
+                       return i;
+       }
+
+       return DA9063_TWDSCALE_MAX;
+}
+
+static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval)
+{
+       return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
+                                 DA9063_TWDSCALE_MASK, regval);
+}
+
+static int da9063_wdt_start(struct watchdog_device *wdd)
+{
+       struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
+       unsigned int selector;
+       int ret;
+
+       selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout);
+       ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
+       if (ret)
+               dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n",
+                       ret);
+
+       return ret;
+}
+
+static int da9063_wdt_stop(struct watchdog_device *wdd)
+{
+       struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
+       int ret;
+
+       ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D,
+                                DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE);
+       if (ret)
+               dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n",
+                         ret);
+
+       return ret;
+}
+
+static int da9063_wdt_ping(struct watchdog_device *wdd)
+{
+       struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
+       int ret;
+
+       ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
+                          DA9063_WATCHDOG);
+       if (ret)
+               dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n",
+                         ret);
+
+       return ret;
+}
+
+static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
+                                 unsigned int timeout)
+{
+       struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
+       unsigned int selector;
+       int ret;
+
+       selector = da9063_wdt_timeout_to_sel(timeout);
+       ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
+       if (ret)
+               dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
+                       ret);
+       else
+               wdd->timeout = wdt_timeout[selector];
+
+       return ret;
+}
+
+static const struct watchdog_info da9063_watchdog_info = {
+       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+       .identity = "DA9063 Watchdog",
+};
+
+static const struct watchdog_ops da9063_watchdog_ops = {
+       .owner = THIS_MODULE,
+       .start = da9063_wdt_start,
+       .stop = da9063_wdt_stop,
+       .ping = da9063_wdt_ping,
+       .set_timeout = da9063_wdt_set_timeout,
+};
+
+static int da9063_wdt_probe(struct platform_device *pdev)
+{
+       int ret;
+       struct da9063 *da9063;
+       struct da9063_watchdog *wdt;
+
+       if (!pdev->dev.parent)
+               return -EINVAL;
+
+       da9063 = dev_get_drvdata(pdev->dev.parent);
+       if (!da9063)
+               return -EINVAL;
+
+       wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
+       if (!wdt)
+               return -ENOMEM;
+
+       wdt->da9063 = da9063;
+
+       wdt->wdtdev.info = &da9063_watchdog_info;
+       wdt->wdtdev.ops = &da9063_watchdog_ops;
+       wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT;
+       wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT;
+       wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT;
+
+       wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
+
+       watchdog_set_drvdata(&wdt->wdtdev, wdt);
+       dev_set_drvdata(&pdev->dev, wdt);
+
+       ret = watchdog_register_device(&wdt->wdtdev);
+
+       return ret;
+}
+
+static int da9063_wdt_remove(struct platform_device *pdev)
+{
+       struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);
+
+       watchdog_unregister_device(&wdt->wdtdev);
+
+       return 0;
+}
+
+static struct platform_driver da9063_wdt_driver = {
+       .probe = da9063_wdt_probe,
+       .remove = da9063_wdt_remove,
+       .driver = {
+               .name = DA9063_DRVNAME_WATCHDOG,
+       },
+};
+module_platform_driver(da9063_wdt_driver);
+
+MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
+MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);