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>
This commit is contained in:
Krystian Garbaciak
Wim Van Sebroeck
Родитель
22b1c841e3
Коммит
5e9c16e376
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@ -87,6 +87,15 @@ config DA9055_WATCHDOG
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This driver can also be built as a module. If so, the module
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will be called da9055_wdt.
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config DA9063_WATCHDOG
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tristate "Dialog DA9063 Watchdog"
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depends on MFD_DA9063
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select WATCHDOG_CORE
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help
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Support for the watchdog in the DA9063 PMIC.
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This driver can be built as a module. The module name is da9063_wdt.
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config GPIO_WATCHDOG
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tristate "Watchdog device controlled through GPIO-line"
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depends on OF_GPIO
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@ -176,6 +176,7 @@ obj-$(CONFIG_XEN_WDT) += xen_wdt.o
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# Architecture Independent
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obj-$(CONFIG_DA9052_WATCHDOG) += da9052_wdt.o
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obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
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obj-$(CONFIG_DA9063_WATCHDOG) += da9063_wdt.o
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obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o
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obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
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obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
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@ -0,0 +1,191 @@
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/*
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* Watchdog driver for DA9063 PMICs.
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/mfd/da9063/registers.h>
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#include <linux/mfd/da9063/core.h>
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#include <linux/regmap.h>
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/*
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* Watchdog selector to timeout in seconds.
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* 0: WDT disabled;
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* others: timeout = 2048 ms * 2^(TWDSCALE-1).
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*/
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static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
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#define DA9063_TWDSCALE_DISABLE 0
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#define DA9063_TWDSCALE_MIN 1
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#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
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#define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
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#define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
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#define DA9063_WDG_TIMEOUT wdt_timeout[3]
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struct da9063_watchdog {
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struct da9063 *da9063;
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struct watchdog_device wdtdev;
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};
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static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
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{
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unsigned int i;
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for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
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if (wdt_timeout[i] >= secs)
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return i;
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}
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return DA9063_TWDSCALE_MAX;
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}
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static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval)
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{
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return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
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DA9063_TWDSCALE_MASK, regval);
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}
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static int da9063_wdt_start(struct watchdog_device *wdd)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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unsigned int selector;
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int ret;
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selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout);
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ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
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if (ret)
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dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_stop(struct watchdog_device *wdd)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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int ret;
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ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D,
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DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE);
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if (ret)
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dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_ping(struct watchdog_device *wdd)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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int ret;
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ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
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DA9063_WATCHDOG);
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if (ret)
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dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n",
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ret);
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return ret;
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}
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static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
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unsigned int selector;
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int ret;
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selector = da9063_wdt_timeout_to_sel(timeout);
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ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
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if (ret)
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dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
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ret);
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else
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wdd->timeout = wdt_timeout[selector];
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return ret;
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}
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static const struct watchdog_info da9063_watchdog_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "DA9063 Watchdog",
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};
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static const struct watchdog_ops da9063_watchdog_ops = {
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.owner = THIS_MODULE,
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.start = da9063_wdt_start,
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.stop = da9063_wdt_stop,
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.ping = da9063_wdt_ping,
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.set_timeout = da9063_wdt_set_timeout,
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};
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static int da9063_wdt_probe(struct platform_device *pdev)
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{
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int ret;
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struct da9063 *da9063;
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struct da9063_watchdog *wdt;
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if (!pdev->dev.parent)
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return -EINVAL;
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da9063 = dev_get_drvdata(pdev->dev.parent);
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if (!da9063)
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return -EINVAL;
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wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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wdt->da9063 = da9063;
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wdt->wdtdev.info = &da9063_watchdog_info;
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wdt->wdtdev.ops = &da9063_watchdog_ops;
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wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT;
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wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT;
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wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT;
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wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
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watchdog_set_drvdata(&wdt->wdtdev, wdt);
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dev_set_drvdata(&pdev->dev, wdt);
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ret = watchdog_register_device(&wdt->wdtdev);
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return ret;
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}
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static int da9063_wdt_remove(struct platform_device *pdev)
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{
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struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);
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watchdog_unregister_device(&wdt->wdtdev);
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return 0;
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}
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static struct platform_driver da9063_wdt_driver = {
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.probe = da9063_wdt_probe,
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.remove = da9063_wdt_remove,
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.driver = {
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.name = DA9063_DRVNAME_WATCHDOG,
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},
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};
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module_platform_driver(da9063_wdt_driver);
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MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
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MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);
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