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Commit 70f39976 authored by Kyle Roeschley's avatar Kyle Roeschley Committed by Wim Van Sebroeck
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watchdog: ni903x_wdt: Add NI 903x/913x watchdog driver 



Add support for the watchdog timer on NI cRIO-903x and cDAQ-913x real-
time controllers.

Signed-off-by: default avatarJeff Westfahl <jeff.westfahl@ni.com>
Signed-off-by: default avatarKyle Roeschley <kyle.roeschley@ni.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 4d8b229d

Documentation/watchdog/watchdog-parameters.txt

+5 −0
Original line number Diff line number Diff line
@@ -200,6 +200,11 @@ mv64x60_wdt: 
nowayout: Watchdog cannot be stopped once started

	(default=kernel config parameter)

-------------------------------------------------

ni903x_wdt:

timeout: Initial watchdog timeout in seconds (0<timeout<516, default=60)

nowayout: Watchdog cannot be stopped once started

	(default=kernel config parameter)

-------------------------------------------------

nuc900_wdt:

heartbeat: Watchdog heartbeats in seconds.

	(default = 15)

drivers/watchdog/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -1217,6 +1217,17 @@ config SBC_EPX_C3_WATCHDOG 
	  To compile this driver as a module, choose M here: the

	  module will be called sbc_epx_c3.



config NI903X_WDT

	tristate "NI 903x/913x Watchdog"

	depends on X86 && ACPI

	select WATCHDOG_CORE

	---help---

	  This is the driver for the watchdog timer on the National Instruments

	  903x/913x real-time controllers.



	  To compile this driver as a module, choose M here: the module will be

	  called ni903x_wdt.



# M32R Architecture



# M68K Architecture

drivers/watchdog/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -126,6 +126,7 @@ obj-$(CONFIG_MACHZ_WDT) += machzwd.o 
obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o

obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o

obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o

obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o



# M32R Architecture

drivers/watchdog/ni903x_wdt.c

0 → 100644
+270 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2016 National Instruments Corp.

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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/acpi.h>

#include <linux/device.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/watchdog.h>



#define NIWD_CONTROL	0x01

#define NIWD_COUNTER2	0x02

#define NIWD_COUNTER1	0x03

#define NIWD_COUNTER0	0x04

#define NIWD_SEED2	0x05

#define NIWD_SEED1	0x06

#define NIWD_SEED0	0x07



#define NIWD_IO_SIZE	0x08



#define NIWD_CONTROL_MODE		0x80

#define NIWD_CONTROL_PROC_RESET		0x20

#define NIWD_CONTROL_PET		0x10

#define NIWD_CONTROL_RUNNING		0x08

#define NIWD_CONTROL_CAPTURECOUNTER	0x04

#define NIWD_CONTROL_RESET		0x02

#define NIWD_CONTROL_ALARM		0x01



#define NIWD_PERIOD_NS		30720

#define NIWD_MIN_TIMEOUT	1

#define NIWD_MAX_TIMEOUT	515

#define NIWD_DEFAULT_TIMEOUT	60



#define NIWD_NAME		"ni903x_wdt"



struct ni903x_wdt {

	struct device *dev;

	u16 io_base;

	struct watchdog_device wdd;

};



static unsigned int timeout;

module_param(timeout, uint, 0);

MODULE_PARM_DESC(timeout,

		 "Watchdog timeout in seconds. (default="

		 __MODULE_STRING(NIWD_DEFAULT_TIMEOUT) ")");



static int nowayout = WATCHDOG_NOWAYOUT;

module_param(nowayout, int, S_IRUGO);

MODULE_PARM_DESC(nowayout,

		 "Watchdog cannot be stopped once started (default="

		 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");



static void ni903x_start(struct ni903x_wdt *wdt)

{

	u8 control = inb(wdt->io_base + NIWD_CONTROL);



	outb(control | NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL);

	outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL);

}



static int ni903x_wdd_set_timeout(struct watchdog_device *wdd,

				  unsigned int timeout)

{

	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);

	u32 counter = timeout * (1000000000 / NIWD_PERIOD_NS);



	outb(((0x00FF0000 & counter) >> 16), wdt->io_base + NIWD_SEED2);

	outb(((0x0000FF00 & counter) >> 8), wdt->io_base + NIWD_SEED1);

	outb((0x000000FF & counter), wdt->io_base + NIWD_SEED0);



	wdd->timeout = timeout;



	return 0;

}



static unsigned int ni903x_wdd_get_timeleft(struct watchdog_device *wdd)

{

	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);

	u8 control, counter0, counter1, counter2;

	u32 counter;



	control = inb(wdt->io_base + NIWD_CONTROL);

	control |= NIWD_CONTROL_CAPTURECOUNTER;

	outb(control, wdt->io_base + NIWD_CONTROL);



	counter2 = inb(wdt->io_base + NIWD_COUNTER2);

	counter1 = inb(wdt->io_base + NIWD_COUNTER1);

	counter0 = inb(wdt->io_base + NIWD_COUNTER0);



	counter = (counter2 << 16) | (counter1 << 8) | counter0;



	return counter / (1000000000 / NIWD_PERIOD_NS);

}



static int ni903x_wdd_ping(struct watchdog_device *wdd)

{

	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);

	u8 control;



	control = inb(wdt->io_base + NIWD_CONTROL);

	outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL);



	return 0;

}



static int ni903x_wdd_start(struct watchdog_device *wdd)

{

	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);



	outb(NIWD_CONTROL_RESET | NIWD_CONTROL_PROC_RESET,

	     wdt->io_base + NIWD_CONTROL);



	ni903x_wdd_set_timeout(wdd, wdd->timeout);

	ni903x_start(wdt);



	return 0;

}



static int ni903x_wdd_stop(struct watchdog_device *wdd)

{

	struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd);



	outb(NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL);



	return 0;

}



static acpi_status ni903x_resources(struct acpi_resource *res, void *data)

{

	struct ni903x_wdt *wdt = data;

	u16 io_size;



	switch (res->type) {

	case ACPI_RESOURCE_TYPE_IO:

		if (wdt->io_base != 0) {

			dev_err(wdt->dev, "too many IO resources\n");

			return AE_ERROR;

		}



		wdt->io_base = res->data.io.minimum;

		io_size = res->data.io.address_length;



		if (io_size < NIWD_IO_SIZE) {

			dev_err(wdt->dev, "memory region too small\n");

			return AE_ERROR;

		}



		if (!devm_request_region(wdt->dev, wdt->io_base, io_size,

					 NIWD_NAME)) {

			dev_err(wdt->dev, "failed to get memory region\n");

			return AE_ERROR;

		}



		return AE_OK;



	case ACPI_RESOURCE_TYPE_END_TAG:

	default:

		/* Ignore unsupported resources, e.g. IRQ */

		return AE_OK;

	}

}



static const struct watchdog_info ni903x_wdd_info = {

	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,

	.identity = "NI Watchdog",

};



static const struct watchdog_ops ni903x_wdd_ops = {

	.owner = THIS_MODULE,

	.start = ni903x_wdd_start,

	.stop = ni903x_wdd_stop,

	.ping = ni903x_wdd_ping,

	.set_timeout = ni903x_wdd_set_timeout,

	.get_timeleft = ni903x_wdd_get_timeleft,

};



static int ni903x_acpi_add(struct acpi_device *device)

{

	struct device *dev = &device->dev;

	struct watchdog_device *wdd;

	struct ni903x_wdt *wdt;

	acpi_status status;

	int ret;



	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);

	if (!wdt)

		return -ENOMEM;



	device->driver_data = wdt;

	wdt->dev = dev;



	status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,

				     ni903x_resources, wdt);

	if (ACPI_FAILURE(status) || wdt->io_base == 0) {

		dev_err(dev, "failed to get resources\n");

		return -ENODEV;

	}



	wdd = &wdt->wdd;

	wdd->info = &ni903x_wdd_info;

	wdd->ops = &ni903x_wdd_ops;

	wdd->min_timeout = NIWD_MIN_TIMEOUT;

	wdd->max_timeout = NIWD_MAX_TIMEOUT;

	wdd->timeout = NIWD_DEFAULT_TIMEOUT;

	wdd->parent = dev;

	watchdog_set_drvdata(wdd, wdt);

	watchdog_set_nowayout(wdd, nowayout);

	ret = watchdog_init_timeout(wdd, timeout, dev);

	if (ret)

		dev_err(dev, "unable to set timeout value, using default\n");



	ret = watchdog_register_device(wdd);

	if (ret) {

		dev_err(dev, "failed to register watchdog\n");

		return ret;

	}



	/* Switch from boot mode to user mode */

	outb(NIWD_CONTROL_RESET | NIWD_CONTROL_MODE,

	     wdt->io_base + NIWD_CONTROL);



	dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n",

		wdt->io_base, timeout, nowayout);



	return 0;

}



static int ni903x_acpi_remove(struct acpi_device *device)

{

	struct ni903x_wdt *wdt = acpi_driver_data(device);



	ni903x_wdd_stop(&wdt->wdd);

	watchdog_unregister_device(&wdt->wdd);



	return 0;

}



static const struct acpi_device_id ni903x_device_ids[] = {

	{"NIC775C", 0},

	{"", 0},

};

MODULE_DEVICE_TABLE(acpi, ni903x_device_ids);



static struct acpi_driver ni903x_acpi_driver = {

	.name = NIWD_NAME,

	.ids = ni903x_device_ids,

	.ops = {

		.add = ni903x_acpi_add,

		.remove = ni903x_acpi_remove,

	},

};



module_acpi_driver(ni903x_acpi_driver);



MODULE_DESCRIPTION("NI 903x Watchdog");

MODULE_AUTHOR("Jeff Westfahl <jeff.westfahl@ni.com>");

MODULE_AUTHOR("Kyle Roeschley <kyle.roeschley@ni.com>");

MODULE_LICENSE("GPL");