mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
5f5e19093b
Fix the following checkpatch warnings and error:
WARNING: quoted string split across lines
WARNING: braces {} are not necessary for single statement blocks
WARNING: __initdata should be placed after ibmasr_id_table[]
WARNING: please, no space before tabs
ERROR: do not initialise statics to 0 or NULL
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
174 lines
4.3 KiB
C
174 lines
4.3 KiB
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static int ep93xx_wdt_stop(struct watchdog_device *wdd)
|
|
{
|
|
del_timer_sync(&timer);
|
|
writel(0xaa55, mmio_base + EP93XX_WATCHDOG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ep93xx_wdt_keepalive(struct watchdog_device *wdd)
|
|
{
|
|
/* user land ping */
|
|
next_heartbeat = jiffies + (timeout * HZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
static int ep93xx_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
watchdog_unregister_device(&ep93xx_wdt_wdd);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ep93xx_wdt_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.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);
|