Release 4.7 drivers/watchdog/ep93xx_wdt.c
/*
* Watchdog driver for Cirrus Logic EP93xx family of devices.
*
* Copyright (c) 2004 Ray Lehtiniemi
* Copyright (c) 2006 Tower Technologies
* Based on ep93xx driver, bits from alim7101_wdt.c
*
* Authors: Ray Lehtiniemi <rayl@mail.com>,
* Alessandro Zummo <a.zummo@towertech.it>
*
* Copyright (c) 2012 H Hartley Sweeten <hsweeten@visionengravers.com>
* Convert to a platform device and use the watchdog framework API
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*
* This watchdog fires after 250msec, which is a too short interval
* for us to rely on the user space daemon alone. So we ping the
* wdt each ~200msec and eventually stop doing it if the user space
* daemon dies.
*
* TODO:
*
* - Test last reset from watchdog status
* - Add a few missing ioctls
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/watchdog.h>
#include <linux/timer.h>
#include <linux/io.h>
#define WDT_VERSION "0.4"
/* default timeout (secs) */
#define WDT_TIMEOUT 30
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
static unsigned int timeout = WDT_TIMEOUT;
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. (1<=timeout<=3600, default="
__MODULE_STRING(WDT_TIMEOUT) ")");
static void __iomem *mmio_base;
static struct timer_list timer;
static unsigned long next_heartbeat;
#define EP93XX_WATCHDOG 0x00
#define EP93XX_WDSTATUS 0x04
/* reset the wdt every ~200ms - the heartbeat of the device is 0.250 seconds*/
#define WDT_INTERVAL (HZ/5)
static void ep93xx_wdt_timer_ping(unsigned long data)
{
if (time_before(jiffies, next_heartbeat))
writel(0x5555, mmio_base + EP93XX_WATCHDOG);
/* Re-set the timer interval */
mod_timer(&timer, jiffies + WDT_INTERVAL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| h hartley sweeten | h hartley sweeten | 22 | 56.41% | 2 | 66.67% |
| alessandro zummo | alessandro zummo | 17 | 43.59% | 1 | 33.33% |
| Total | 39 | 100.00% | 3 | 100.00% |
static int ep93xx_wdt_start(struct watchdog_device *wdd)
{
next_heartbeat = jiffies + (timeout * HZ);
writel(0xaaaa, mmio_base + EP93XX_WATCHDOG);
mod_timer(&timer, jiffies + WDT_INTERVAL);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alessandro zummo | alessandro zummo | 26 | 60.47% | 1 | 50.00% |
| h hartley sweeten | h hartley sweeten | 17 | 39.53% | 1 | 50.00% |
| Total | 43 | 100.00% | 2 | 100.00% |
static int ep93xx_wdt_stop(struct watchdog_device *wdd)
{
del_timer_sync(&timer);
writel(0xaa55, mmio_base + EP93XX_WATCHDOG);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| h hartley sweeten | h hartley sweeten | 17 | 58.62% | 1 | 50.00% |
| alessandro zummo | alessandro zummo | 12 | 41.38% | 1 | 50.00% |
| Total | 29 | 100.00% | 2 | 100.00% |
static int ep93xx_wdt_keepalive(struct watchdog_device *wdd)
{
/* user land ping */
next_heartbeat = jiffies + (timeout * HZ);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| alessandro zummo | alessandro zummo | 19 | 76.00% | 1 | 50.00% |
| h hartley sweeten | h hartley sweeten | 6 | 24.00% | 1 | 50.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
static const struct watchdog_info ep93xx_wdt_ident = {
.options = WDIOF_CARDRESET |
WDIOF_MAGICCLOSE |
WDIOF_KEEPALIVEPING,
.identity = "EP93xx Watchdog",
};
static struct watchdog_ops ep93xx_wdt_ops = {
.owner = THIS_MODULE,
.start = ep93xx_wdt_start,
.stop = ep93xx_wdt_stop,
.ping = ep93xx_wdt_keepalive,
};
static struct watchdog_device ep93xx_wdt_wdd = {
.info = &ep93xx_wdt_ident,
.ops = &ep93xx_wdt_ops,
};
static int ep93xx_wdt_probe(struct platform_device *pdev)
{
struct resource *res;
unsigned long val;
int err;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mmio_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mmio_base))
return PTR_ERR(mmio_base);
if (timeout < 1 || timeout > 3600) {
timeout = WDT_TIMEOUT;
dev_warn(&pdev->dev,
"timeout value must be 1<=x<=3600, using %d\n",
timeout);
}
val = readl(mmio_base + EP93XX_WATCHDOG);
ep93xx_wdt_wdd.bootstatus = (val & 0x01) ? WDIOF_CARDRESET : 0;
ep93xx_wdt_wdd.timeout = timeout;
ep93xx_wdt_wdd.parent = &pdev->dev;
watchdog_set_nowayout(&ep93xx_wdt_wdd, nowayout);
setup_timer(&timer, ep93xx_wdt_timer_ping, 1);
err = watchdog_register_device(&ep93xx_wdt_wdd);
if (err)
return err;
dev_info(&pdev->dev,
"EP93XX watchdog, driver version " WDT_VERSION "%s\n",
(val & 0x08) ? " (nCS1 disable detected)" : "");
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| h hartley sweeten | h hartley sweeten | 88 | 48.09% | 2 | 25.00% |
| wim van sebroeck | wim van sebroeck | 33 | 18.03% | 1 | 12.50% |
| alessandro zummo | alessandro zummo | 32 | 17.49% | 1 | 12.50% |
| pratyush anand | pratyush anand | 9 | 4.92% | 1 | 12.50% |
| jingoo han | jingoo han | 8 | 4.37% | 1 | 12.50% |
| joe perches | joe perches | 7 | 3.83% | 1 | 12.50% |
| mika westerberg | mika westerberg | 6 | 3.28% | 1 | 12.50% |
| Total | 183 | 100.00% | 8 | 100.00% |
static int ep93xx_wdt_remove(struct platform_device *pdev)
{
watchdog_unregister_device(&ep93xx_wdt_wdd);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| h hartley sweeten | h hartley sweeten | 11 | 55.00% | 2 | 66.67% |
| alessandro zummo | alessandro zummo | 9 | 45.00% | 1 | 33.33% |
| Total | 20 | 100.00% | 3 | 100.00% |
static struct platform_driver ep93xx_wdt_driver = {
.driver = {
.name = "ep93xx-wdt",
},
.probe = ep93xx_wdt_probe,
.remove = ep93xx_wdt_remove,
};
module_platform_driver(ep93xx_wdt_driver);
MODULE_AUTHOR("Ray Lehtiniemi <rayl@mail.com>");
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
MODULE_DESCRIPTION("EP93xx Watchdog");
MODULE_LICENSE("GPL");
MODULE_VERSION(WDT_VERSION);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| h hartley sweeten | h hartley sweeten | 260 | 45.38% | 2 | 14.29% |
| alessandro zummo | alessandro zummo | 231 | 40.31% | 1 | 7.14% |
| wim van sebroeck | wim van sebroeck | 38 | 6.63% | 4 | 28.57% |
| jingoo han | jingoo han | 18 | 3.14% | 2 | 14.29% |
| pratyush anand | pratyush anand | 9 | 1.57% | 1 | 7.14% |
| joe perches | joe perches | 7 | 1.22% | 1 | 7.14% |
| mika westerberg | mika westerberg | 6 | 1.05% | 1 | 7.14% |
| arnd bergmann | arnd bergmann | 3 | 0.52% | 1 | 7.14% |
| ryan mallon | ryan mallon | 1 | 0.17% | 1 | 7.14% |
| Total | 573 | 100.00% | 14 | 100.00% |
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