Commit c36a483d authored by William Breathitt Gray's avatar William Breathitt Gray Committed by Wim Van Sebroeck
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watchdog: Add watchdog timer support for the WinSystems EBC-C384 



The WinSystems EBC-C384 has an onboard watchdog timer. The timeout range
supported by the watchdog timer is 1 second to 255 minutes. Timeouts
under 256 seconds have a 1 second granularity, while the rest have a 1
minute granularity.

This driver adds watchdog timer support for this onboard watchdog timer.
The timeout may be configured via the timeout module parameter.

Signed-off-by: default avatarWilliam Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 70f39976

MAINTAINERS

+6 −0
Original line number Diff line number Diff line
@@ -11870,6 +11870,12 @@ M: David Härdeman <david@hardeman.nu> 
S:	Maintained

F:	drivers/media/rc/winbond-cir.c



WINSYSTEMS EBC-C384 WATCHDOG DRIVER

M:	William Breathitt Gray <vilhelm.gray@gmail.com>

L:	linux-watchdog@vger.kernel.org

S:	Maintained

F:	drivers/watchdog/ebc-c384_wdt.c



WIMAX STACK

M:	Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>

M:	linux-wimax@intel.com

drivers/watchdog/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -715,6 +715,15 @@ config ALIM7101_WDT 


	  Most people will say N.



config EBC_C384_WDT

	tristate "WinSystems EBC-C384 Watchdog Timer"

	depends on X86

	select WATCHDOG_CORE

	help

	  Enables watchdog timer support for the watchdog timer on the

	  WinSystems EBC-C384 motherboard. The timeout may be configured via

	  the timeout module parameter.



config F71808E_WDT

	tristate "Fintek F71808E, F71862FG, F71869, F71882FG and F71889FG Watchdog"

	depends on X86

drivers/watchdog/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o 
obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o

obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o

obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o

obj-$(CONFIG_EBC_C384_WDT) += ebc-c384_wdt.o

obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o

obj-$(CONFIG_SP5100_TCO) += sp5100_tco.o

obj-$(CONFIG_GEODE_WDT) += geodewdt.o

drivers/watchdog/ebc-c384_wdt.c

0 → 100644
+188 −0
Original line number Diff line number Diff line 
/*

 * Watchdog timer driver for the WinSystems EBC-C384

 * Copyright (C) 2016 William Breathitt Gray

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License, version 2, as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 */

#include <linux/device.h>

#include <linux/dmi.h>

#include <linux/errno.h>

#include <linux/io.h>

#include <linux/ioport.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>



#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 __init ebc_c384_wdt_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	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);



	if (watchdog_init_timeout(wdd, timeout, dev))

		dev_warn(dev, "Invalid timeout (%u seconds), using default (%u seconds)\n",

			timeout, WATCHDOG_TIMEOUT);



	platform_set_drvdata(pdev, wdd);



	return watchdog_register_device(wdd);

}



static int ebc_c384_wdt_remove(struct platform_device *pdev)

{

	struct watchdog_device *wdd = platform_get_drvdata(pdev);



	watchdog_unregister_device(wdd);



	return 0;

}



static struct platform_driver ebc_c384_wdt_driver = {

	.driver = {

		.name = MODULE_NAME

	},

	.remove = ebc_c384_wdt_remove

};



static struct platform_device *ebc_c384_wdt_device;



static int __init ebc_c384_wdt_init(void)

{

	int err;



	if (!dmi_match(DMI_BOARD_NAME, "EBC-C384 SBC"))

		return -ENODEV;



	ebc_c384_wdt_device = platform_device_alloc(MODULE_NAME, -1);

	if (!ebc_c384_wdt_device)

		return -ENOMEM;



	err = platform_device_add(ebc_c384_wdt_device);

	if (err)

		goto err_platform_device;



	err = platform_driver_probe(&ebc_c384_wdt_driver, ebc_c384_wdt_probe);

	if (err)

		goto err_platform_driver;



	return 0;



err_platform_driver:

	platform_device_del(ebc_c384_wdt_device);

err_platform_device:

	platform_device_put(ebc_c384_wdt_device);

	return err;

}



static void __exit ebc_c384_wdt_exit(void)

{

	platform_device_unregister(ebc_c384_wdt_device);

	platform_driver_unregister(&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("platform:" MODULE_NAME);

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