d017327893
This gets rid of the unnecessary license boilerplate, and avoids having to deal with individual patches one by one. No functional changes. Reviewed-by: Jerry Hoemann <jerry.hoemann@hpe.com> Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Watchdog timer driver for the WinSystems EBC-C384
|
|
* Copyright (C) 2016 William Breathitt Gray
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/io.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/isa.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
|
|
#define MODULE_NAME "ebc-c384_wdt"
|
|
#define WATCHDOG_TIMEOUT 60
|
|
/*
|
|
* The timeout value in minutes must fit in a single byte when sent to the
|
|
* watchdog timer; the maximum timeout possible is 15300 (255 * 60) seconds.
|
|
*/
|
|
#define WATCHDOG_MAX_TIMEOUT 15300
|
|
#define BASE_ADDR 0x564
|
|
#define ADDR_EXTENT 5
|
|
#define CFG_ADDR (BASE_ADDR + 1)
|
|
#define PET_ADDR (BASE_ADDR + 2)
|
|
|
|
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 unsigned timeout;
|
|
module_param(timeout, uint, 0);
|
|
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
|
|
__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
|
|
|
|
static int ebc_c384_wdt_start(struct watchdog_device *wdev)
|
|
{
|
|
unsigned t = wdev->timeout;
|
|
|
|
/* resolution is in minutes for timeouts greater than 255 seconds */
|
|
if (t > 255)
|
|
t = DIV_ROUND_UP(t, 60);
|
|
|
|
outb(t, PET_ADDR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ebc_c384_wdt_stop(struct watchdog_device *wdev)
|
|
{
|
|
outb(0x00, PET_ADDR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ebc_c384_wdt_set_timeout(struct watchdog_device *wdev, unsigned t)
|
|
{
|
|
/* resolution is in minutes for timeouts greater than 255 seconds */
|
|
if (t > 255) {
|
|
/* round second resolution up to minute granularity */
|
|
wdev->timeout = roundup(t, 60);
|
|
|
|
/* set watchdog timer for minutes */
|
|
outb(0x00, CFG_ADDR);
|
|
} else {
|
|
wdev->timeout = t;
|
|
|
|
/* set watchdog timer for seconds */
|
|
outb(0x80, CFG_ADDR);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct watchdog_ops ebc_c384_wdt_ops = {
|
|
.start = ebc_c384_wdt_start,
|
|
.stop = ebc_c384_wdt_stop,
|
|
.set_timeout = ebc_c384_wdt_set_timeout
|
|
};
|
|
|
|
static const struct watchdog_info ebc_c384_wdt_info = {
|
|
.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT,
|
|
.identity = MODULE_NAME
|
|
};
|
|
|
|
static int ebc_c384_wdt_probe(struct device *dev, unsigned int id)
|
|
{
|
|
struct watchdog_device *wdd;
|
|
|
|
if (!devm_request_region(dev, BASE_ADDR, ADDR_EXTENT, dev_name(dev))) {
|
|
dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
|
|
BASE_ADDR, BASE_ADDR + ADDR_EXTENT);
|
|
return -EBUSY;
|
|
}
|
|
|
|
wdd = devm_kzalloc(dev, sizeof(*wdd), GFP_KERNEL);
|
|
if (!wdd)
|
|
return -ENOMEM;
|
|
|
|
wdd->info = &ebc_c384_wdt_info;
|
|
wdd->ops = &ebc_c384_wdt_ops;
|
|
wdd->timeout = WATCHDOG_TIMEOUT;
|
|
wdd->min_timeout = 1;
|
|
wdd->max_timeout = WATCHDOG_MAX_TIMEOUT;
|
|
|
|
watchdog_set_nowayout(wdd, nowayout);
|
|
watchdog_init_timeout(wdd, timeout, dev);
|
|
|
|
return devm_watchdog_register_device(dev, wdd);
|
|
}
|
|
|
|
static struct isa_driver ebc_c384_wdt_driver = {
|
|
.probe = ebc_c384_wdt_probe,
|
|
.driver = {
|
|
.name = MODULE_NAME
|
|
},
|
|
};
|
|
|
|
static int __init ebc_c384_wdt_init(void)
|
|
{
|
|
if (!dmi_match(DMI_BOARD_NAME, "EBC-C384 SBC"))
|
|
return -ENODEV;
|
|
|
|
return isa_register_driver(&ebc_c384_wdt_driver, 1);
|
|
}
|
|
|
|
static void __exit ebc_c384_wdt_exit(void)
|
|
{
|
|
isa_unregister_driver(&ebc_c384_wdt_driver);
|
|
}
|
|
|
|
module_init(ebc_c384_wdt_init);
|
|
module_exit(ebc_c384_wdt_exit);
|
|
|
|
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
|
|
MODULE_DESCRIPTION("WinSystems EBC-C384 watchdog timer driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("isa:" MODULE_NAME);
|