From: Ian Lartey <ian@slimlogic.co.uk>
To: linux-kernel@vger.kernel.org
Cc: linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-leds@vger.kernel.org, linux-watchdog@vger.kernel.org,
devicetree-discuss@lists.ozlabs.org, swarren@wwwdotorg.org,
grant.likely@secretlab.ca, broonie@opensource.wolfsonmicro.com,
rob.herring@calxeda.com, rob@landley.net, mturquette@linaro.org,
linus.walleij@linaro.org, cooloney@gmail.com,
sfr@canb.auug.org.au, rpurdie@rpsys.net,
akpm@linux-foundation.org, sameo@linux.intel.com, wim@iguana.be,
lgirdwood@gmail.com, gg@slimlogic.co.uk, j-keerthy@ti.com,
ldewangan@nvidia.com, t-kristo@ti.com
Subject: [PATCH v10 04/12] watchdog: add Palmas Watchdog support
Date: Fri, 22 Mar 2013 14:55:14 +0000 [thread overview]
Message-ID: <1363964122-19201-5-git-send-email-ian@slimlogic.co.uk> (raw)
In-Reply-To: <1363964122-19201-1-git-send-email-ian@slimlogic.co.uk>
From: Graeme Gregory <gg@slimlogic.co.uk>
Add support for the Palmas watchdog timer which has a timeout configurable
from 1s to 128s.
Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Ian Lartey <ian@slimlogic.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@slimlogic.co.uk>
+ * Author: Ian Lartey <ian@slimlogic.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@slimlogic.co.uk>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:palmas-wdt");
+MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);
--
1.7.0.4
next prev parent reply other threads:[~2013-03-22 14:58 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-22 14:55 [PATCH v10 0/12] Palmas updates Ian Lartey
2013-03-22 14:55 ` [PATCH v10 01/12] mfd: DT bindings for the palmas family MFD Ian Lartey
2013-03-25 17:59 ` Stephen Warren
2013-03-25 19:47 ` Mark Brown
2013-05-30 11:33 ` keerthy
2013-05-30 23:03 ` Stephen Warren
[not found] ` <DC88CAD03C0052499C1907B327FC63229E662E@DBDE04.ent.ti.com>
2013-06-04 6:24 ` gg
2013-03-22 14:55 ` [PATCH v10 02/12] mfd: palmas: is_palmas_charger needed by multiple drivers Ian Lartey
2013-04-08 15:51 ` Samuel Ortiz
2013-03-22 14:55 ` [PATCH v10 03/12] mfd: palmas add variant and OTP detection Ian Lartey
2013-04-05 16:32 ` Samuel Ortiz
2013-03-22 14:55 ` Ian Lartey [this message]
2013-03-24 3:19 ` [PATCH v10 04/12] watchdog: add Palmas Watchdog support Guenter Roeck
2013-08-20 20:31 ` Wim Van Sebroeck
2013-03-22 14:55 ` [PATCH v10 05/12] watchdog: Kconfig for Palmas watchdog Ian Lartey
2013-03-24 4:09 ` Guenter Roeck
2013-03-22 14:55 ` [PATCH v10 06/12] gpio: palmas: add in GPIO support for palmas charger Ian Lartey
2013-03-22 14:55 ` [PATCH v10 07/12] gpio: palmas: Enable DT support for palmas gpio Ian Lartey
2013-03-22 14:55 ` [PATCH v10 08/12] gpio: Palmas palmas_gpio_(read|write|update) factoring Ian Lartey
2013-03-22 14:55 ` [PATCH v10 09/12] leds: Add support for Palmas LEDs Ian Lartey
2013-03-22 14:55 ` [PATCH v10 10/12] clk: add a clock driver for palmas Ian Lartey
2013-03-22 14:55 ` [PATCH v10 11/12] clk: Kconfig for Palmas clock driver Ian Lartey
2013-03-22 14:55 ` [PATCH v10 12/12] regulator: palmas remove palmas-charger option from DT bindings Ian Lartey
2013-03-25 1:07 ` Mark Brown
2013-03-22 19:04 ` [PATCH v10 0/12] Palmas updates Stephen Rothwell
2013-03-24 21:13 ` Mark Brown
2013-04-05 16:30 ` Samuel Ortiz
2013-04-08 15:55 ` Graeme Gregory
2013-04-08 16:11 ` Samuel Ortiz
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