mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 08:49:45 +00:00
![Damien Riegel](/assets/img/avatar_default.png)
Get rid of the custom restart handler by using the one provided by the watchdog core. Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
211 lines
5.3 KiB
C
211 lines
5.3 KiB
C
/*
|
|
* Watchdog driver for DA9063 PMICs.
|
|
*
|
|
* Copyright(c) 2012 Dialog Semiconductor Ltd.
|
|
*
|
|
* Author: Mariusz Wojtasik <mariusz.wojtasik@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/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/da9063/registers.h>
|
|
#include <linux/mfd/da9063/core.h>
|
|
#include <linux/regmap.h>
|
|
|
|
/*
|
|
* Watchdog selector to timeout in seconds.
|
|
* 0: WDT disabled;
|
|
* others: timeout = 2048 ms * 2^(TWDSCALE-1).
|
|
*/
|
|
static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
|
|
#define DA9063_TWDSCALE_DISABLE 0
|
|
#define DA9063_TWDSCALE_MIN 1
|
|
#define DA9063_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
|
|
#define DA9063_WDT_MIN_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MIN]
|
|
#define DA9063_WDT_MAX_TIMEOUT wdt_timeout[DA9063_TWDSCALE_MAX]
|
|
#define DA9063_WDG_TIMEOUT wdt_timeout[3]
|
|
|
|
struct da9063_watchdog {
|
|
struct da9063 *da9063;
|
|
struct watchdog_device wdtdev;
|
|
};
|
|
|
|
static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = DA9063_TWDSCALE_MIN; i <= DA9063_TWDSCALE_MAX; i++) {
|
|
if (wdt_timeout[i] >= secs)
|
|
return i;
|
|
}
|
|
|
|
return DA9063_TWDSCALE_MAX;
|
|
}
|
|
|
|
static int _da9063_wdt_set_timeout(struct da9063 *da9063, unsigned int regval)
|
|
{
|
|
return regmap_update_bits(da9063->regmap, DA9063_REG_CONTROL_D,
|
|
DA9063_TWDSCALE_MASK, regval);
|
|
}
|
|
|
|
static int da9063_wdt_start(struct watchdog_device *wdd)
|
|
{
|
|
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
|
|
unsigned int selector;
|
|
int ret;
|
|
|
|
selector = da9063_wdt_timeout_to_sel(wdt->wdtdev.timeout);
|
|
ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
|
|
if (ret)
|
|
dev_err(wdt->da9063->dev, "Watchdog failed to start (err = %d)\n",
|
|
ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int da9063_wdt_stop(struct watchdog_device *wdd)
|
|
{
|
|
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
|
|
int ret;
|
|
|
|
ret = regmap_update_bits(wdt->da9063->regmap, DA9063_REG_CONTROL_D,
|
|
DA9063_TWDSCALE_MASK, DA9063_TWDSCALE_DISABLE);
|
|
if (ret)
|
|
dev_alert(wdt->da9063->dev, "Watchdog failed to stop (err = %d)\n",
|
|
ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int da9063_wdt_ping(struct watchdog_device *wdd)
|
|
{
|
|
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
|
|
int ret;
|
|
|
|
ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
|
|
DA9063_WATCHDOG);
|
|
if (ret)
|
|
dev_alert(wdt->da9063->dev, "Failed to ping the watchdog (err = %d)\n",
|
|
ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
|
|
unsigned int timeout)
|
|
{
|
|
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
|
|
unsigned int selector;
|
|
int ret;
|
|
|
|
selector = da9063_wdt_timeout_to_sel(timeout);
|
|
ret = _da9063_wdt_set_timeout(wdt->da9063, selector);
|
|
if (ret)
|
|
dev_err(wdt->da9063->dev, "Failed to set watchdog timeout (err = %d)\n",
|
|
ret);
|
|
else
|
|
wdd->timeout = wdt_timeout[selector];
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int da9063_wdt_restart(struct watchdog_device *wdd)
|
|
{
|
|
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
|
|
int ret;
|
|
|
|
ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
|
|
DA9063_SHUTDOWN);
|
|
if (ret)
|
|
dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n",
|
|
ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct watchdog_info da9063_watchdog_info = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
|
.identity = "DA9063 Watchdog",
|
|
};
|
|
|
|
static const struct watchdog_ops da9063_watchdog_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = da9063_wdt_start,
|
|
.stop = da9063_wdt_stop,
|
|
.ping = da9063_wdt_ping,
|
|
.set_timeout = da9063_wdt_set_timeout,
|
|
.restart = da9063_wdt_restart,
|
|
};
|
|
|
|
static int da9063_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct da9063 *da9063;
|
|
struct da9063_watchdog *wdt;
|
|
|
|
if (!pdev->dev.parent)
|
|
return -EINVAL;
|
|
|
|
da9063 = dev_get_drvdata(pdev->dev.parent);
|
|
if (!da9063)
|
|
return -EINVAL;
|
|
|
|
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
|
|
if (!wdt)
|
|
return -ENOMEM;
|
|
|
|
wdt->da9063 = da9063;
|
|
|
|
wdt->wdtdev.info = &da9063_watchdog_info;
|
|
wdt->wdtdev.ops = &da9063_watchdog_ops;
|
|
wdt->wdtdev.min_timeout = DA9063_WDT_MIN_TIMEOUT;
|
|
wdt->wdtdev.max_timeout = DA9063_WDT_MAX_TIMEOUT;
|
|
wdt->wdtdev.timeout = DA9063_WDG_TIMEOUT;
|
|
wdt->wdtdev.parent = &pdev->dev;
|
|
|
|
wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
|
|
|
|
watchdog_set_restart_priority(&wdt->wdtdev, 128);
|
|
|
|
watchdog_set_drvdata(&wdt->wdtdev, wdt);
|
|
dev_set_drvdata(&pdev->dev, wdt);
|
|
|
|
ret = watchdog_register_device(&wdt->wdtdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int da9063_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);
|
|
|
|
watchdog_unregister_device(&wdt->wdtdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver da9063_wdt_driver = {
|
|
.probe = da9063_wdt_probe,
|
|
.remove = da9063_wdt_remove,
|
|
.driver = {
|
|
.name = DA9063_DRVNAME_WATCHDOG,
|
|
},
|
|
};
|
|
module_platform_driver(da9063_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Mariusz Wojtasik <mariusz.wojtasik@diasemi.com>");
|
|
MODULE_DESCRIPTION("Watchdog driver for Dialog DA9063");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DA9063_DRVNAME_WATCHDOG);
|