mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-24 12:44:11 +08:00
9539210e17
After commit 487722cf2 (watchdog: Get rid of MODULE_ALIAS_MISCDEV
statements) the affected drivers no longer need to include miscdevice.h.
Only exception is rt2880_wdt.c which never needed it.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
170 lines
4.0 KiB
C
170 lines
4.0 KiB
C
/*
|
|
* Copyright (C) ST-Ericsson SA 2011-2013
|
|
*
|
|
* License Terms: GNU General Public License v2
|
|
*
|
|
* Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson
|
|
* Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/err.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/platform_data/ux500_wdt.h>
|
|
|
|
#include <linux/mfd/dbx500-prcmu.h>
|
|
|
|
#define WATCHDOG_TIMEOUT 600 /* 10 minutes */
|
|
|
|
#define WATCHDOG_MIN 0
|
|
#define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */
|
|
#define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */
|
|
|
|
static unsigned int timeout = WATCHDOG_TIMEOUT;
|
|
module_param(timeout, uint, 0);
|
|
MODULE_PARM_DESC(timeout,
|
|
"Watchdog timeout in seconds. default="
|
|
__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
static int ux500_wdt_start(struct watchdog_device *wdd)
|
|
{
|
|
return prcmu_enable_a9wdog(PRCMU_WDOG_ALL);
|
|
}
|
|
|
|
static int ux500_wdt_stop(struct watchdog_device *wdd)
|
|
{
|
|
return prcmu_disable_a9wdog(PRCMU_WDOG_ALL);
|
|
}
|
|
|
|
static int ux500_wdt_keepalive(struct watchdog_device *wdd)
|
|
{
|
|
return prcmu_kick_a9wdog(PRCMU_WDOG_ALL);
|
|
}
|
|
|
|
static int ux500_wdt_set_timeout(struct watchdog_device *wdd,
|
|
unsigned int timeout)
|
|
{
|
|
ux500_wdt_stop(wdd);
|
|
prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
|
|
ux500_wdt_start(wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct watchdog_info ux500_wdt_info = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
|
.identity = "Ux500 WDT",
|
|
.firmware_version = 1,
|
|
};
|
|
|
|
static const struct watchdog_ops ux500_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = ux500_wdt_start,
|
|
.stop = ux500_wdt_stop,
|
|
.ping = ux500_wdt_keepalive,
|
|
.set_timeout = ux500_wdt_set_timeout,
|
|
};
|
|
|
|
static struct watchdog_device ux500_wdt = {
|
|
.info = &ux500_wdt_info,
|
|
.ops = &ux500_wdt_ops,
|
|
.min_timeout = WATCHDOG_MIN,
|
|
.max_timeout = WATCHDOG_MAX32,
|
|
};
|
|
|
|
static int ux500_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct ux500_wdt_data *pdata = dev_get_platdata(&pdev->dev);
|
|
|
|
if (pdata) {
|
|
if (pdata->timeout > 0)
|
|
timeout = pdata->timeout;
|
|
if (pdata->has_28_bits_resolution)
|
|
ux500_wdt.max_timeout = WATCHDOG_MAX28;
|
|
}
|
|
|
|
watchdog_set_nowayout(&ux500_wdt, nowayout);
|
|
|
|
/* disable auto off on sleep */
|
|
prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
|
|
|
|
/* set HW initial value */
|
|
prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
|
|
|
|
ret = watchdog_register_device(&ux500_wdt);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_info(&pdev->dev, "initialized\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ux500_wdt_remove(struct platform_device *dev)
|
|
{
|
|
watchdog_unregister_device(&ux500_wdt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int ux500_wdt_suspend(struct platform_device *pdev,
|
|
pm_message_t state)
|
|
{
|
|
if (watchdog_active(&ux500_wdt)) {
|
|
ux500_wdt_stop(&ux500_wdt);
|
|
prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true);
|
|
|
|
prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
|
|
ux500_wdt_start(&ux500_wdt);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ux500_wdt_resume(struct platform_device *pdev)
|
|
{
|
|
if (watchdog_active(&ux500_wdt)) {
|
|
ux500_wdt_stop(&ux500_wdt);
|
|
prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
|
|
|
|
prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
|
|
ux500_wdt_start(&ux500_wdt);
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
#define ux500_wdt_suspend NULL
|
|
#define ux500_wdt_resume NULL
|
|
#endif
|
|
|
|
static struct platform_driver ux500_wdt_driver = {
|
|
.probe = ux500_wdt_probe,
|
|
.remove = ux500_wdt_remove,
|
|
.suspend = ux500_wdt_suspend,
|
|
.resume = ux500_wdt_resume,
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ux500_wdt",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(ux500_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
|
|
MODULE_DESCRIPTION("Ux500 Watchdog Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:ux500_wdt");
|