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Date: Fri, 22 Mar 2013 14:55:14 +0000
From: Ian Lartey <ian@...mlogic.co.uk>
To: linux-kernel@...r.kernel.org
Cc: linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-leds@...r.kernel.org, linux-watchdog@...r.kernel.org,
devicetree-discuss@...ts.ozlabs.org, swarren@...dotorg.org,
grant.likely@...retlab.ca, broonie@...nsource.wolfsonmicro.com,
rob.herring@...xeda.com, rob@...dley.net, mturquette@...aro.org,
linus.walleij@...aro.org, cooloney@...il.com, sfr@...b.auug.org.au,
rpurdie@...ys.net, akpm@...ux-foundation.org,
sameo@...ux.intel.com, wim@...ana.be, lgirdwood@...il.com,
gg@...mlogic.co.uk, j-keerthy@...com, ldewangan@...dia.com,
t-kristo@...com
Subject: [PATCH v10 04/12] watchdog: add Palmas Watchdog support
From: Graeme Gregory <gg@...mlogic.co.uk>
Add support for the Palmas watchdog timer which has a timeout configurable
from 1s to 128s.
Signed-off-by: Graeme Gregory <gg@...mlogic.co.uk>
Signed-off-by: Ian Lartey <ian@...mlogic.co.uk>
---
drivers/watchdog/palmas_wdt.c | 169 +++++++++++++++++++++++++++++++++++++++++
1 files changed, 169 insertions(+), 0 deletions(-)
create mode 100644 drivers/watchdog/palmas_wdt.c
diff --git a/drivers/watchdog/palmas_wdt.c b/drivers/watchdog/palmas_wdt.c
new file mode 100644
index 0000000..da7e379
--- /dev/null
+++ b/drivers/watchdog/palmas_wdt.c
@@ -0,0 +1,169 @@
+/*
+ * Driver for Watchdog part of Palmas PMIC Chips
+ *
+ * Copyright 2011-2013 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@...mlogic.co.uk>
+ * Author: Ian Lartey <ian@...mlogic.co.uk>
+ *
+ * Based on twl4030_wdt.c
+ *
+ * Author: Timo Kokkonen <timo.t.kokkonen at nokia.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/types.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/watchdog.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/mfd/palmas.h>
+
+struct palmas_wdt {
+ struct palmas *palmas;
+ struct watchdog_device wdt;
+ struct device *dev;
+
+ int timer_margin;
+};
+
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
+ "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static int palmas_wdt_write(struct palmas *palmas, unsigned int data)
+{
+ unsigned int addr;
+
+ addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_WATCHDOG);
+
+ return palmas_write(palmas, PALMAS_PMU_CONTROL_BASE, addr, addr);
+}
+
+static int palmas_wdt_enable(struct watchdog_device *wdt)
+{
+ struct palmas_wdt *driver_data = watchdog_get_drvdata(wdt);
+ struct palmas *palmas = driver_data->palmas;
+
+ return palmas_wdt_write(palmas, driver_data->timer_margin |
+ PALMAS_WATCHDOG_ENABLE);
+}
+
+static int palmas_wdt_disable(struct watchdog_device *wdt)
+{
+ struct palmas_wdt *driver_data = watchdog_get_drvdata(wdt);
+ struct palmas *palmas = driver_data->palmas;
+
+ return palmas_wdt_write(palmas, driver_data->timer_margin);
+}
+
+static int palmas_wdt_set_timeout(struct watchdog_device *wdt, unsigned timeout)
+{
+ struct palmas_wdt *driver_data = watchdog_get_drvdata(wdt);
+
+ if (timeout < 1 || timeout > 128) {
+ dev_warn(driver_data->dev,
+ "Timeout can only be in the range [1-128] seconds");
+ return -EINVAL;
+ }
+ driver_data->timer_margin = fls(timeout) - 1;
+ return 0;
+}
+
+static const struct watchdog_info palmas_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+ .identity = "Palmas Watchdog",
+ .firmware_version = 0,
+};
+
+static const struct watchdog_ops palmas_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = palmas_wdt_enable,
+ .stop = palmas_wdt_disable,
+ .ping = palmas_wdt_enable,
+ .set_timeout = palmas_wdt_set_timeout,
+};
+
+static int palmas_wdt_probe(struct platform_device *pdev)
+{
+ struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
+ struct palmas_wdt *driver_data;
+ struct watchdog_device *palmas_wdt;
+ int ret = 0;
+
+ driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
+ GFP_KERNEL);
+ if (!driver_data) {
+ dev_err(&pdev->dev, "Unable to alloacate watchdog device\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ driver_data->palmas = palmas;
+
+ palmas_wdt = &driver_data->wdt;
+
+ palmas_wdt->info = &palmas_wdt_info;
+ palmas_wdt->ops = &palmas_wdt_ops;
+ watchdog_set_nowayout(palmas_wdt, nowayout);
+ watchdog_set_drvdata(palmas_wdt, driver_data);
+
+ ret = watchdog_register_device(&driver_data->wdt);
+ if (ret) {
+ platform_set_drvdata(pdev, NULL);
+ goto err;
+ }
+
+ dev_set_drvdata(&pdev->dev, driver_data);
+
+ return 0;
+err:
+ return ret;
+}
+
+static int palmas_wdt_remove(struct platform_device *pdev)
+{
+ struct palmas_wdt *driver_data = dev_get_drvdata(&pdev->dev);
+
+ watchdog_unregister_device(&driver_data->wdt);
+
+ return 0;
+}
+
+static struct of_device_id of_palmas_match_tbl[] = {
+ { .compatible = "ti,palmas-wdt", },
+ { .compatible = "ti,twl6035-wdt", },
+ { .compatible = "ti,twl6036-wdt", },
+ { .compatible = "ti,twl6037-wdt", },
+ { .compatible = "ti,tps65913-wdt", },
+ { .compatible = "ti,tps65914-wdt", },
+ { .compatible = "ti,tps80036-wdt", },
+ { /* end */ }
+};
+
+static struct platform_driver palmas_wdt_driver = {
+ .probe = palmas_wdt_probe,
+ .remove = palmas_wdt_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .of_match_table = of_palmas_match_tbl,
+ .name = "palmas-wdt",
+ },
+};
+
+module_platform_driver(palmas_wdt_driver);
+
+MODULE_AUTHOR("Graeme Gregory <gg@...mlogic.co.uk>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:palmas-wdt");
+MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
--
1.7.0.4
--
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