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>

3 files changed, 201 insertions, 0 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 4edae08800ec..a51ccf3461fb 100644
--- 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 f105999da2f3..f8eaaf45e923 100644
--- 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
index 000000000000..2cd6b2c2dd2a
--- /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);