mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Marcus Folkesson](/assets/img/avatar_default.png)
- Add SPDX identifier - Remove boiler plate license text - If MODULE_LICENSE and boiler plate does not match, go for boiler plate license Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com> Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Acked-by: Baruch Siach <baruch@tkos.co.il> Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com> Acked-by: Keiji Hayashibara <hayashibara.keiji@socionext.com> Acked-by: Johannes Thumshirn <jth@kernel.org> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Mans Rullgard <mans@mansr.com> Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: Michal Simek <michal.simek@xilinx.com> Acked-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Acked-by: Thierry Reding <treding@nvidia.com> Acked-by: Tomas Winkler <tomas.winkler@intel.com> Acked-by: Patrice Chotard <patrice.chotard@st.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
243 lines
5.8 KiB
C
243 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Watchdog driver for Broadcom BCM47XX
|
|
*
|
|
* Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
|
|
* Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
|
|
* Copyright (C) 2012-2013 Hauke Mehrtens <hauke@hauke-m.de>
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/bcm47xx_wdt.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/jiffies.h>
|
|
|
|
#define DRV_NAME "bcm47xx_wdt"
|
|
|
|
#define WDT_DEFAULT_TIME 30 /* seconds */
|
|
#define WDT_SOFTTIMER_MAX 255 /* seconds */
|
|
#define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */
|
|
|
|
static int timeout = WDT_DEFAULT_TIME;
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
|
|
module_param(timeout, int, 0);
|
|
MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default="
|
|
__MODULE_STRING(WDT_DEFAULT_TIME) ")");
|
|
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd)
|
|
{
|
|
return container_of(wdd, struct bcm47xx_wdt, wdd);
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
wdt->timer_set_ms(wdt, wdd->timeout * 1000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
wdt->timer_set(wdt, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
|
|
unsigned int new_time)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
u32 max_timer = wdt->max_timer_ms;
|
|
|
|
if (new_time < 1 || new_time > max_timer / 1000) {
|
|
pr_warn("timeout value must be 1<=x<=%d, using %d\n",
|
|
max_timer / 1000, new_time);
|
|
return -EINVAL;
|
|
}
|
|
|
|
wdd->timeout = new_time;
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_restart(struct watchdog_device *wdd,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
wdt->timer_set(wdt, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct watchdog_ops bcm47xx_wdt_hard_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = bcm47xx_wdt_hard_start,
|
|
.stop = bcm47xx_wdt_hard_stop,
|
|
.ping = bcm47xx_wdt_hard_keepalive,
|
|
.set_timeout = bcm47xx_wdt_hard_set_timeout,
|
|
.restart = bcm47xx_wdt_restart,
|
|
};
|
|
|
|
static void bcm47xx_wdt_soft_timer_tick(struct timer_list *t)
|
|
{
|
|
struct bcm47xx_wdt *wdt = from_timer(wdt, t, soft_timer);
|
|
u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms);
|
|
|
|
if (!atomic_dec_and_test(&wdt->soft_ticks)) {
|
|
wdt->timer_set_ms(wdt, next_tick);
|
|
mod_timer(&wdt->soft_timer, jiffies + HZ);
|
|
} else {
|
|
pr_crit("Watchdog will fire soon!!!\n");
|
|
}
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
atomic_set(&wdt->soft_ticks, wdd->timeout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
bcm47xx_wdt_soft_keepalive(wdd);
|
|
bcm47xx_wdt_soft_timer_tick(&wdt->soft_timer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
del_timer_sync(&wdt->soft_timer);
|
|
wdt->timer_set(wdt, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd,
|
|
unsigned int new_time)
|
|
{
|
|
if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) {
|
|
pr_warn("timeout value must be 1<=x<=%d, using %d\n",
|
|
WDT_SOFTTIMER_MAX, new_time);
|
|
return -EINVAL;
|
|
}
|
|
|
|
wdd->timeout = new_time;
|
|
return 0;
|
|
}
|
|
|
|
static const struct watchdog_info bcm47xx_wdt_info = {
|
|
.identity = DRV_NAME,
|
|
.options = WDIOF_SETTIMEOUT |
|
|
WDIOF_KEEPALIVEPING |
|
|
WDIOF_MAGICCLOSE,
|
|
};
|
|
|
|
static const struct watchdog_ops bcm47xx_wdt_soft_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = bcm47xx_wdt_soft_start,
|
|
.stop = bcm47xx_wdt_soft_stop,
|
|
.ping = bcm47xx_wdt_soft_keepalive,
|
|
.set_timeout = bcm47xx_wdt_soft_set_timeout,
|
|
.restart = bcm47xx_wdt_restart,
|
|
};
|
|
|
|
static int bcm47xx_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
bool soft;
|
|
struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
|
|
|
|
if (!wdt)
|
|
return -ENXIO;
|
|
|
|
soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000;
|
|
|
|
if (soft) {
|
|
wdt->wdd.ops = &bcm47xx_wdt_soft_ops;
|
|
timer_setup(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick, 0);
|
|
} else {
|
|
wdt->wdd.ops = &bcm47xx_wdt_hard_ops;
|
|
}
|
|
|
|
wdt->wdd.info = &bcm47xx_wdt_info;
|
|
wdt->wdd.timeout = WDT_DEFAULT_TIME;
|
|
wdt->wdd.parent = &pdev->dev;
|
|
ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout);
|
|
if (ret)
|
|
goto err_timer;
|
|
watchdog_set_nowayout(&wdt->wdd, nowayout);
|
|
watchdog_set_restart_priority(&wdt->wdd, 64);
|
|
watchdog_stop_on_reboot(&wdt->wdd);
|
|
|
|
ret = watchdog_register_device(&wdt->wdd);
|
|
if (ret)
|
|
goto err_timer;
|
|
|
|
dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
|
|
timeout, nowayout ? ", nowayout" : "",
|
|
soft ? ", Software Timer" : "");
|
|
return 0;
|
|
|
|
err_timer:
|
|
if (soft)
|
|
del_timer_sync(&wdt->soft_timer);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bcm47xx_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
|
|
|
|
watchdog_unregister_device(&wdt->wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver bcm47xx_wdt_driver = {
|
|
.driver = {
|
|
.name = "bcm47xx-wdt",
|
|
},
|
|
.probe = bcm47xx_wdt_probe,
|
|
.remove = bcm47xx_wdt_remove,
|
|
};
|
|
|
|
module_platform_driver(bcm47xx_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Aleksandar Radovanovic");
|
|
MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
|
|
MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
|
|
MODULE_LICENSE("GPL");
|