271 lines
6.7 KiB
C
271 lines
6.7 KiB
C
/*
|
|
* 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");
|