This driver supports watchdog device inside DA906x PMIC.
Signed-off-by: Krystian Garbaciak <krystian.garbaciak@xxxxxxxxxxx>
---
drivers/watchdog/Kconfig | 27 ++++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/da906x_wdt.c | 276 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 304 insertions(+), 0 deletions(-)
create mode 100644 drivers/watchdog/da906x_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 53d7571..ef07575 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -76,6 +76,33 @@ config DA9052_WATCHDOG
Alternatively say M to compile the driver as a module,
which will be called da9052_wdt.
+config DA906X_WATCHDOG
+ tristate "Dialog DA906X Watchdog"
+ depends on MFD_DA906X
+ select WATCHDOG_CORE
+ help
+ Support for the watchdog in the DA906X PMIC.
+
+config DA906X_WDT_DEFAULT_TIMEOUT
+ int "Watchdog timeout in seconds <2, 4, 8, 16, 32, 65, 131>"
+ depends on DA906X_WATCHDOG
+ default 8
+ range 2 131
+ help
+ Select the default watchdog timer period to be used by the
+ Dialog DA906x watchdog driver. Supported values are:
+ 2, 4, 8, 16, 32, 65, 131 seconds.
+
+config DA906X_WDT_FLEXIBLE_TIMEOUT
+ bool "Flexible watchdog timeout (when requested value is unsupported)"
+ depends on DA906X_WATCHDOG
+ default y
+ help
+ Say Y here to allow to select longer watchdog timer period to be
+ used when requested value is not supported. The lowest available
+ value higher than requested will be used (watchdog will never
+ expire before requested timeout).
+
config WM831X_WATCHDOG
tristate "WM831x watchdog"
depends on MFD_WM831X
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 572b39b..0746a87 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -164,6 +164,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
# Architecture Independent
obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
+obj-$(CONFIG_DA906X_WATCHDOG) += da906x_wdt.o
obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
diff --git a/drivers/watchdog/da906x_wdt.c b/drivers/watchdog/da906x_wdt.c
new file mode 100644
index 0000000..a67e4fa
--- /dev/null
+++ b/drivers/watchdog/da906x_wdt.c
@@ -0,0 +1,276 @@
+/*
+ * Watchdog driver for DA906X PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: Mariusz Wojtasik <mariusz.wojtasik@xxxxxxxxxxx>
+ *
+ * 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/da906x/registers.h>
+#include <linux/mfd/da906x/core.h>
+
+#define SUPPORTED_TIMEOUTS_STR "2, 4, 8, 16, 32, 65, 131"
+
+/* Watchdog selector to timeout in seconds.
+ 0: WDT disabled;
+ others: timeout = 2048 ms * 2^(TWDSCALE-1). */
+const int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
+#define DA906X_TWDSCALE_DISABLE 0
+#define DA906X_TWDSCALE_MIN 1
+#define DA906X_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
+#define DA906X_WDT_MIN_TIMEOUT wdt_timeout[DA906X_TWDSCALE_MIN]
+#define DA906X_WDT_MAX_TIMEOUT wdt_timeout[DA906X_TWDSCALE_MAX]
+#define WATCHDOG_DEFAULT_TIMEOUT wdt_timeout[3];
+
+/* module parameters */
+static int default_timeout = CONFIG_DA906X_WDT_DEFAULT_TIMEOUT;
+module_param(default_timeout, int, 0);
+MODULE_PARM_DESC(default_timeout,
+ "Watchdog timeout in seconds (select from: " SUPPORTED_TIMEOUTS_STR
+ " default=" __stringify(CONFIG_DA906X_WDT_DEFAULT_TIMEOUT) ")");
+
+static bool flex_timeout = CONFIG_DA906X_WDT_FLEXIBLE_TIMEOUT;
+module_param(flex_timeout, bool, false);
+MODULE_PARM_DESC(flex_timeout,
+ "Watchdog flexible timeout, allows longer timeout than requested"
+ " (default=" __stringify(CONFIG_DA906X_WDT_FLEXIBLE_TIMEOUT) ")");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+ "Watchdog cannot be stopped once started (default="
+ __stringify(WATCHDOG_NOWAYOUT) ")");
+
+
+struct da906x_watchdog {
+ struct da906x *da906x;
+ struct watchdog_device *wdtdev;
+ struct mutex lock;
+};
+static struct da906x_watchdog da906x_watchdog;
+
+static int _da906x_wdt_timeout_to_sel(int secs)
+{
+ int i;
+
+ for (i = DA906X_TWDSCALE_MIN; i <= DA906X_TWDSCALE_MAX; i++) {
+ if (wdt_timeout[i] == secs ||
+ (flex_timeout && wdt_timeout[i] > secs))
+ return i;
+ }
+
+ return 0;
+}
+
+static int _da906x_wdt_disable(struct da906x *da906x)
+{
+ return da906x_reg_update(da906x, DA906X_REG_CONTROL_D,
+ DA906X_TWDSCALE_MASK,
+ DA906X_TWDSCALE_DISABLE << DA906X_TWDSCALE_SHIFT);
+}
+
+static int _da906x_wdt_set_timeout(struct da906x *da906x, unsigned int regval)
+{
+ if (regval > DA906X_TWDSCALE_MAX)
+ return -EINVAL;
+
+ return da906x_reg_update(da906x, DA906X_REG_CONTROL_D,
+ DA906X_TWDSCALE_MASK, regval << DA906X_TWDSCALE_SHIFT);
+}
+
+static int _da906x_wdt_kick(struct da906x *da906x)
+{
+ return da906x_reg_write(da906x, DA906X_REG_CONTROL_F, DA906X_WATCHDOG);
+}
+
+static int da906x_wdt_start(struct watchdog_device *wdd)
+{
+ struct da906x_watchdog *wdt = watchdog_get_drvdata(wdd);
+ unsigned int selector;
+ int ret = 0;
+
+ mutex_lock(&wdt->lock);
+ selector = _da906x_wdt_timeout_to_sel(wdt->wdtdev->timeout);
+ ret = _da906x_wdt_set_timeout(wdt->da906x, selector);
+ if (ret != 0) {
+ dev_err(wdt->da906x->dev,
+ "Watchdog failed to start (err = %d)\n", ret);
+ }
+ mutex_unlock(&wdt->lock);
+
+ return ret;
+}
+
+static int da906x_wdt_stop(struct watchdog_device *wdd)
+{
+ struct da906x_watchdog *wdt = watchdog_get_drvdata(wdd);
+ int ret = 0;
+
+ mutex_lock(&wdt->lock);
+ ret = _da906x_wdt_disable(wdt->da906x);
+ if (ret < 0)
+ dev_alert(wdt->da906x->dev,
+ "Watchdog failed to stop (err = %d)\n", ret);
+ mutex_unlock(&wdt->lock);
+
+ return ret;
+}
+
+static int da906x_wdt_ping(struct watchdog_device *wdd)
+{
+ struct da906x_watchdog *wdt = watchdog_get_drvdata(wdd);
+ int ret = 0;
+
+ mutex_lock(&wdt->lock);
+ ret = _da906x_wdt_kick(wdt->da906x);
+ if (ret < 0)
+ dev_alert(wdt->da906x->dev,
+ "Failed to ping the watchdog (err = %d)\n", ret);
+ mutex_unlock(&wdt->lock);
+
+ return ret;
+}
+
+static int da906x_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ struct da906x_watchdog *wdt = watchdog_get_drvdata(wdd);
+ unsigned int selector;
+ int ret = 0;
+
+ mutex_lock(&wdt->lock);
+ selector = _da906x_wdt_timeout_to_sel(timeout);
+ if (selector == 0) {
+ dev_err(wdt->da906x->dev,
+ "Unsupported watchdog timeout (selecto from: "
+ SUPPORTED_TIMEOUTS_STR ")\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = _da906x_wdt_set_timeout(wdt->da906x, selector);
+ if (ret < 0) {
+ dev_err(wdt->da906x->dev,
+ "Failed to set watchdog timeout (err = %d)\n", ret);
+ goto out;
+ }
+
+ wdd->timeout = wdt_timeout[selector];
+
+out:
+ mutex_unlock(&wdt->lock);
+
+ return ret;
+}
+
+static struct watchdog_info da906x_watchdog_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+ .identity = "DA906x Watchdog",
+};
+
+static struct watchdog_ops da906x_watchdog_ops = {
+ .owner = THIS_MODULE,
+ .start = da906x_wdt_start,
+ .stop = da906x_wdt_stop,
+ .ping = da906x_wdt_ping,
+ .set_timeout = da906x_wdt_set_timeout,
+};
+
+static struct watchdog_device da906x_watchdog_device = {
+ .info = &da906x_watchdog_info,
+ .ops = &da906x_watchdog_ops,
+ .driver_data = &da906x_watchdog,
+};
+
+static int __devinit da906x_wdt_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct da906x *da906x = dev_get_drvdata(pdev->dev.parent);
+ struct da906x_watchdog *wdt = &da906x_watchdog;
+ unsigned int selector;
+
+ if (wdt->da906x != NULL) {
+ dev_err(da906x->dev, DA906X_DRVNAME_WATCHDOG
+ " already registered.\n");
+ return -EBUSY;
+ }
+
+ wdt->da906x = da906x;
+ wdt->wdtdev = &da906x_watchdog_device;
+ mutex_init(&wdt->lock);
+
+ if (nowayout)
+ set_bit(WDOG_NO_WAY_OUT, &wdt->wdtdev->status);
+
+ if (flex_timeout)
+ wdt->wdtdev->min_timeout = 1;
+ else
+ wdt->wdtdev->min_timeout = DA906X_WDT_MIN_TIMEOUT;
+
+ wdt->wdtdev->max_timeout = DA906X_WDT_MAX_TIMEOUT;
+
+ selector = _da906x_wdt_timeout_to_sel(default_timeout);
+ if (selector == 0) {
+ wdt->wdtdev->timeout = WATCHDOG_DEFAULT_TIMEOUT;
+ dev_warn(da906x->dev,
+ "Invalid default timeout: %d "
+ "(select from: " SUPPORTED_TIMEOUTS_STR ").\n",
+ default_timeout);
+ dev_warn(da906x->dev, "Default timeout is %d secs.\n",
+ wdt->wdtdev->timeout);
+ } else {
+ wdt->wdtdev->timeout = wdt_timeout[selector];
+ if (wdt->wdtdev->timeout != default_timeout) {
+ dev_info(da906x->dev, "Using %d secs timeout.\n",
+ wdt->wdtdev->timeout);
+ }
+ }
+
+ ret = watchdog_register_device(wdt->wdtdev);
+ if (ret)
+ dev_err(da906x->dev, DA906X_DRVNAME_WATCHDOG
+ " registration failed (err = %d)", ret);
+
+ return ret;
+}
+
+static int __devexit da906x_wdt_remove(struct platform_device *dev)
+{
+ struct da906x_watchdog *wdt = &da906x_watchdog;
+
+ watchdog_unregister_device(&da906x_watchdog_device);
+ wdt->da906x = NULL;
+ wdt->wdtdev = NULL;
+
+ return 0;
+}
+
+static struct platform_driver da906x_wdt_driver = {
+ .probe = da906x_wdt_probe,
+ .remove = __devexit_p(da906x_wdt_remove),
+ .driver = {
+ .name = DA906X_DRVNAME_WATCHDOG,
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(da906x_wdt_driver);
+
+MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Watchdog driver for Dialog DA906x");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DA906X_DRVNAME_WATCHDOG);
--
1.7.0.4
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