Watchdog: DA9052/53 PMIC watchdog support
authorAshish Jangam <ashish.jangam@kpitcummins.com>
Thu, 24 May 2012 13:01:14 +0000 (18:31 +0530)
committerWim Van Sebroeck <wim@iguana.be>
Wed, 30 May 2012 05:56:12 +0000 (07:56 +0200)
This driver adds support for the watchdog functionality provided by
the Dialog Semiconductor DA9052 PMIC chip.

Tested on samsung smdkv6410 and i.mx53 QS boards.

Signed-off-by: Anthony Olech <Anthony.Olech@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Documentation/watchdog/watchdog-parameters.txt
drivers/watchdog/Kconfig
drivers/watchdog/Makefile
drivers/watchdog/da9052_wdt.c [new file with mode: 0644]

index 17ddd822b4563c2cdf80ba80f422db5b4b35e002..04fddbacdbde74a03ae18ea6d91e5c0f452c0b44 100644 (file)
@@ -78,6 +78,11 @@ wd0_timeout: Default watchdog0 timeout in 1/10secs
 wd1_timeout: Default watchdog1 timeout in 1/10secs
 wd2_timeout: Default watchdog2 timeout in 1/10secs
 -------------------------------------------------
+da9052wdt:
+timeout: Watchdog timeout in seconds. 2<= timeout <=131, default=2.048s
+nowayout: Watchdog cannot be stopped once started
+       (default=kernel config parameter)
+-------------------------------------------------
 davinci_wdt:
 heartbeat: Watchdog heartbeat period in seconds from 1 to 600, default 60
 -------------------------------------------------
index d92d7488be16677a6436e7224ebaaaf1c087fe57..004e26152460a2ce0fd4b389a60141318ae53cdd 100644 (file)
@@ -64,6 +64,18 @@ config SOFT_WATCHDOG
          To compile this driver as a module, choose M here: the
          module will be called softdog.
 
+config DA9052_WATCHDOG
+        tristate "Dialog DA9052 Watchdog"
+        depends on PMIC_DA9052
+        select WATCHDOG_CORE
+        help
+          Support for the watchdog in the DA9052 PMIC. Watchdog trigger
+          cause system reset.
+
+          Say Y here to include support for the DA9052 watchdog.
+          Alternatively say M to compile the driver as a module,
+          which will be called da9052_wdt.
+
 config WM831X_WATCHDOG
        tristate "WM831x watchdog"
        depends on MFD_WM831X
index 442bfbe0882a29206035d17c0faa5ca629c7af45..572b39bed06a256ff6c79df0b943acbda7e88174 100644 (file)
@@ -163,6 +163,7 @@ obj-$(CONFIG_WATCHDOG_CP1XXX)               += cpwd.o
 obj-$(CONFIG_XEN_WDT) += xen_wdt.o
 
 # Architecture Independent
+obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
 obj-$(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/da9052_wdt.c b/drivers/watchdog/da9052_wdt.c
new file mode 100644 (file)
index 0000000..3f75129
--- /dev/null
@@ -0,0 +1,251 @@
+/*
+ * System monitoring driver for DA9052 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: Anthony Olech <Anthony.Olech@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/module.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
+#include <linux/time.h>
+#include <linux/watchdog.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/delay.h>
+
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/da9052.h>
+
+#define DA9052_DEF_TIMEOUT     4
+#define DA9052_TWDMIN          256
+
+struct da9052_wdt_data {
+       struct watchdog_device wdt;
+       struct da9052 *da9052;
+       struct kref kref;
+       unsigned long jpast;
+};
+
+static const struct {
+       u8 reg_val;
+       int time;  /* Seconds */
+} da9052_wdt_maps[] = {
+       { 1, 2 },
+       { 2, 4 },
+       { 3, 8 },
+       { 4, 16 },
+       { 5, 32 },
+       { 5, 33 },  /* Actual time  32.768s so included both 32s and 33s */
+       { 6, 65 },
+       { 6, 66 },  /* Actual time 65.536s so include both, 65s and 66s */
+       { 7, 131 },
+};
+
+
+static void da9052_wdt_release_resources(struct kref *r)
+{
+       struct da9052_wdt_data *driver_data =
+               container_of(r, struct da9052_wdt_data, kref);
+
+       kfree(driver_data);
+}
+
+static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
+                                 unsigned int timeout)
+{
+       struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+       struct da9052 *da9052 = driver_data->da9052;
+       int ret, i;
+
+       /*
+        * Disable the Watchdog timer before setting
+        * new time out.
+        */
+       ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
+                               DA9052_CONTROLD_TWDSCALE, 0);
+       if (ret < 0) {
+               dev_err(da9052->dev, "Failed to disable watchdog bit, %d\n",
+                       ret);
+               return ret;
+       }
+       if (timeout) {
+               /*
+                * To change the timeout, da9052 needs to
+                * be disabled for at least 150 us.
+                */
+               udelay(150);
+
+               /* Set the desired timeout */
+               for (i = 0; i < ARRAY_SIZE(da9052_wdt_maps); i++)
+                       if (da9052_wdt_maps[i].time == timeout)
+                               break;
+
+               if (i == ARRAY_SIZE(da9052_wdt_maps))
+                       ret = -EINVAL;
+               else
+                       ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
+                                               DA9052_CONTROLD_TWDSCALE,
+                                               da9052_wdt_maps[i].reg_val);
+               if (ret < 0) {
+                       dev_err(da9052->dev,
+                               "Failed to update timescale bit, %d\n", ret);
+                       return ret;
+               }
+
+               wdt_dev->timeout = timeout;
+               driver_data->jpast = jiffies;
+       }
+
+       return 0;
+}
+
+static void da9052_wdt_ref(struct watchdog_device *wdt_dev)
+{
+       struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+
+       kref_get(&driver_data->kref);
+}
+
+static void da9052_wdt_unref(struct watchdog_device *wdt_dev)
+{
+       struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+
+       kref_put(&driver_data->kref, da9052_wdt_release_resources);
+}
+
+static int da9052_wdt_start(struct watchdog_device *wdt_dev)
+{
+       return da9052_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+}
+
+static int da9052_wdt_stop(struct watchdog_device *wdt_dev)
+{
+       return da9052_wdt_set_timeout(wdt_dev, 0);
+}
+
+static int da9052_wdt_ping(struct watchdog_device *wdt_dev)
+{
+       struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
+       struct da9052 *da9052 = driver_data->da9052;
+       unsigned long msec, jnow = jiffies;
+       int ret;
+
+       /*
+        * We have a minimum time for watchdog window called TWDMIN. A write
+        * to the watchdog before this elapsed time should cause an error.
+        */
+       msec = (jnow - driver_data->jpast) * 1000/HZ;
+       if (msec < DA9052_TWDMIN)
+               mdelay(msec);
+
+       /* Reset the watchdog timer */
+       ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
+                               DA9052_CONTROLD_WATCHDOG, 1 << 7);
+       if (ret < 0)
+               goto err_strobe;
+
+       /*
+        * FIXME: Reset the watchdog core, in general PMIC
+        * is supposed to do this
+        */
+       ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
+                               DA9052_CONTROLD_WATCHDOG, 0 << 7);
+err_strobe:
+       return ret;
+}
+
+static struct watchdog_info da9052_wdt_info = {
+       .options        = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+       .identity       = "DA9052 Watchdog",
+};
+
+static const struct watchdog_ops da9052_wdt_ops = {
+       .owner = THIS_MODULE,
+       .start = da9052_wdt_start,
+       .stop = da9052_wdt_stop,
+       .ping = da9052_wdt_ping,
+       .set_timeout = da9052_wdt_set_timeout,
+       .ref = da9052_wdt_ref,
+       .unref = da9052_wdt_unref,
+};
+
+
+static int __devinit da9052_wdt_probe(struct platform_device *pdev)
+{
+       struct da9052 *da9052 = dev_get_drvdata(pdev->dev.parent);
+       struct da9052_wdt_data *driver_data;
+       struct watchdog_device *da9052_wdt;
+       int ret;
+
+       driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
+                                  GFP_KERNEL);
+       if (!driver_data) {
+               dev_err(da9052->dev, "Unable to alloacate watchdog device\n");
+               ret = -ENOMEM;
+               goto err;
+       }
+       driver_data->da9052 = da9052;
+
+       da9052_wdt = &driver_data->wdt;
+
+       da9052_wdt->timeout = DA9052_DEF_TIMEOUT;
+       da9052_wdt->info = &da9052_wdt_info;
+       da9052_wdt->ops = &da9052_wdt_ops;
+       watchdog_set_drvdata(da9052_wdt, driver_data);
+
+       kref_init(&driver_data->kref);
+
+       ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
+                               DA9052_CONTROLD_TWDSCALE, 0);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Failed to disable watchdog bits, %d\n",
+                       ret);
+               goto err;
+       }
+
+       ret = watchdog_register_device(&driver_data->wdt);
+       if (ret != 0) {
+               dev_err(da9052->dev, "watchdog_register_device() failed: %d\n",
+                       ret);
+               goto err;
+       }
+
+       dev_set_drvdata(&pdev->dev, driver_data);
+err:
+       return ret;
+}
+
+static int __devexit da9052_wdt_remove(struct platform_device *pdev)
+{
+       struct da9052_wdt_data *driver_data = dev_get_drvdata(&pdev->dev);
+
+       watchdog_unregister_device(&driver_data->wdt);
+       kref_put(&driver_data->kref, da9052_wdt_release_resources);
+
+       return 0;
+}
+
+static struct platform_driver da9052_wdt_driver = {
+       .probe = da9052_wdt_probe,
+       .remove = __devexit_p(da9052_wdt_remove),
+       .driver = {
+               .name   = "da9052-watchdog",
+       },
+};
+
+module_platform_driver(da9052_wdt_driver);
+
+MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
+MODULE_DESCRIPTION("DA9052 SM Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-watchdog");