linux/drivers/watchdog/ni903x_wdt.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  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

  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 [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] 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

  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 [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

260 lines
6.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 National Instruments Corp.
*/
#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);
watchdog_init_timeout(wdd, timeout, dev);
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");