forked from luck/tmp_suning_uos_patched
watchdog: nic7018_wdt: Add NIC7018 watchdog driver
Add support for the watchdog timer on PXI Embedded Controller. Signed-off-by: Hui Chun Ong <hui.chun.ong@ni.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Hui Chun Ong
Guenter Roeck
parent
6c368932f0
commit
98078ca34a
|
|
@ -209,6 +209,11 @@ timeout: Initial watchdog timeout in seconds (0<timeout<516, default=60)
|
|||
nowayout: Watchdog cannot be stopped once started
|
||||
(default=kernel config parameter)
|
||||
-------------------------------------------------
|
||||
nic7018_wdt:
|
||||
timeout: Initial watchdog timeout in seconds (0<timeout<464, default=80)
|
||||
nowayout: Watchdog cannot be stopped once started
|
||||
(default=kernel config parameter)
|
||||
-------------------------------------------------
|
||||
nuc900_wdt:
|
||||
heartbeat: Watchdog heartbeats in seconds.
|
||||
(default = 15)
|
||||
|
|
|
|||
|
|
@ -1326,6 +1326,16 @@ config NI903X_WDT
|
|||
To compile this driver as a module, choose M here: the module will be
|
||||
called ni903x_wdt.
|
||||
|
||||
config NIC7018_WDT
|
||||
tristate "NIC7018 Watchdog"
|
||||
depends on X86 && ACPI
|
||||
select WATCHDOG_CORE
|
||||
---help---
|
||||
Support for National Instruments NIC7018 Watchdog.
|
||||
|
||||
To compile this driver as a module, choose M here: the module will be
|
||||
called nic7018_wdt.
|
||||
|
||||
# M32R Architecture
|
||||
|
||||
# M68K Architecture
|
||||
|
|
|
|||
|
|
@ -139,6 +139,7 @@ obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o
|
|||
obj-$(CONFIG_INTEL_MID_WATCHDOG) += intel-mid_wdt.o
|
||||
obj-$(CONFIG_INTEL_MEI_WDT) += mei_wdt.o
|
||||
obj-$(CONFIG_NI903X_WDT) += ni903x_wdt.o
|
||||
obj-$(CONFIG_NIC7018_WDT) += nic7018_wdt.o
|
||||
|
||||
# M32R Architecture
|
||||
|
||||
|
|
|
|||
265
drivers/watchdog/nic7018_wdt.c
Normal file
265
drivers/watchdog/nic7018_wdt.c
Normal file
|
|
@ -0,0 +1,265 @@
|
|||
/*
|
||||
* 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/bitops.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/watchdog.h>
|
||||
|
||||
#define LOCK 0xA5
|
||||
#define UNLOCK 0x5A
|
||||
|
||||
#define WDT_CTRL_RESET_EN BIT(7)
|
||||
#define WDT_RELOAD_PORT_EN BIT(7)
|
||||
|
||||
#define WDT_CTRL 1
|
||||
#define WDT_RELOAD_CTRL 2
|
||||
#define WDT_PRESET_PRESCALE 4
|
||||
#define WDT_REG_LOCK 5
|
||||
#define WDT_COUNT 6
|
||||
#define WDT_RELOAD_PORT 7
|
||||
|
||||
#define WDT_MIN_TIMEOUT 1
|
||||
#define WDT_MAX_TIMEOUT 464
|
||||
#define WDT_DEFAULT_TIMEOUT 80
|
||||
|
||||
#define WDT_MAX_COUNTER 15
|
||||
|
||||
static unsigned int timeout;
|
||||
module_param(timeout, uint, 0);
|
||||
MODULE_PARM_DESC(timeout,
|
||||
"Watchdog timeout in seconds. (default="
|
||||
__MODULE_STRING(WDT_DEFAULT_TIMEOUT) ")");
|
||||
|
||||
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) ")");
|
||||
|
||||
struct nic7018_wdt {
|
||||
u16 io_base;
|
||||
u32 period;
|
||||
struct watchdog_device wdd;
|
||||
};
|
||||
|
||||
struct nic7018_config {
|
||||
u32 period;
|
||||
u8 divider;
|
||||
};
|
||||
|
||||
static const struct nic7018_config nic7018_configs[] = {
|
||||
{ 2, 4 },
|
||||
{ 32, 5 },
|
||||
};
|
||||
|
||||
static inline u32 nic7018_timeout(u32 period, u8 counter)
|
||||
{
|
||||
return period * counter - period / 2;
|
||||
}
|
||||
|
||||
static const struct nic7018_config *nic7018_get_config(u32 timeout,
|
||||
u8 *counter)
|
||||
{
|
||||
const struct nic7018_config *config;
|
||||
u8 count;
|
||||
|
||||
if (timeout < 30 && timeout != 16) {
|
||||
config = &nic7018_configs[0];
|
||||
count = timeout / 2 + 1;
|
||||
} else {
|
||||
config = &nic7018_configs[1];
|
||||
count = DIV_ROUND_UP(timeout + 16, 32);
|
||||
|
||||
if (count > WDT_MAX_COUNTER)
|
||||
count = WDT_MAX_COUNTER;
|
||||
}
|
||||
*counter = count;
|
||||
return config;
|
||||
}
|
||||
|
||||
static int nic7018_set_timeout(struct watchdog_device *wdd,
|
||||
unsigned int timeout)
|
||||
{
|
||||
struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
const struct nic7018_config *config;
|
||||
u8 counter;
|
||||
|
||||
config = nic7018_get_config(timeout, &counter);
|
||||
|
||||
outb(counter << 4 | config->divider,
|
||||
wdt->io_base + WDT_PRESET_PRESCALE);
|
||||
|
||||
wdd->timeout = nic7018_timeout(config->period, counter);
|
||||
wdt->period = config->period;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nic7018_start(struct watchdog_device *wdd)
|
||||
{
|
||||
struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
u8 control;
|
||||
|
||||
nic7018_set_timeout(wdd, wdd->timeout);
|
||||
|
||||
control = inb(wdt->io_base + WDT_RELOAD_CTRL);
|
||||
outb(control | WDT_RELOAD_PORT_EN, wdt->io_base + WDT_RELOAD_CTRL);
|
||||
|
||||
outb(1, wdt->io_base + WDT_RELOAD_PORT);
|
||||
|
||||
control = inb(wdt->io_base + WDT_CTRL);
|
||||
outb(control | WDT_CTRL_RESET_EN, wdt->io_base + WDT_CTRL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nic7018_stop(struct watchdog_device *wdd)
|
||||
{
|
||||
struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
|
||||
outb(0, wdt->io_base + WDT_CTRL);
|
||||
outb(0, wdt->io_base + WDT_RELOAD_CTRL);
|
||||
outb(0xF0, wdt->io_base + WDT_PRESET_PRESCALE);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nic7018_ping(struct watchdog_device *wdd)
|
||||
{
|
||||
struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
|
||||
outb(1, wdt->io_base + WDT_RELOAD_PORT);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned int nic7018_get_timeleft(struct watchdog_device *wdd)
|
||||
{
|
||||
struct nic7018_wdt *wdt = watchdog_get_drvdata(wdd);
|
||||
u8 count;
|
||||
|
||||
count = inb(wdt->io_base + WDT_COUNT) & 0xF;
|
||||
if (!count)
|
||||
return 0;
|
||||
|
||||
return nic7018_timeout(wdt->period, count);
|
||||
}
|
||||
|
||||
static const struct watchdog_info nic7018_wdd_info = {
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
||||
.identity = "NIC7018 Watchdog",
|
||||
};
|
||||
|
||||
static const struct watchdog_ops nic7018_wdd_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.start = nic7018_start,
|
||||
.stop = nic7018_stop,
|
||||
.ping = nic7018_ping,
|
||||
.set_timeout = nic7018_set_timeout,
|
||||
.get_timeleft = nic7018_get_timeleft,
|
||||
};
|
||||
|
||||
static int nic7018_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct watchdog_device *wdd;
|
||||
struct nic7018_wdt *wdt;
|
||||
struct resource *io_rc;
|
||||
int ret;
|
||||
|
||||
wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
|
||||
if (!wdt)
|
||||
return -ENOMEM;
|
||||
|
||||
platform_set_drvdata(pdev, wdt);
|
||||
|
||||
io_rc = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
||||
if (!io_rc) {
|
||||
dev_err(dev, "missing IO resources\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!devm_request_region(dev, io_rc->start, resource_size(io_rc),
|
||||
KBUILD_MODNAME)) {
|
||||
dev_err(dev, "failed to get IO region\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
wdt->io_base = io_rc->start;
|
||||
wdd = &wdt->wdd;
|
||||
wdd->info = &nic7018_wdd_info;
|
||||
wdd->ops = &nic7018_wdd_ops;
|
||||
wdd->min_timeout = WDT_MIN_TIMEOUT;
|
||||
wdd->max_timeout = WDT_MAX_TIMEOUT;
|
||||
wdd->timeout = WDT_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_warn(dev, "unable to set timeout value, using default\n");
|
||||
|
||||
/* Unlock WDT register */
|
||||
outb(UNLOCK, wdt->io_base + WDT_REG_LOCK);
|
||||
|
||||
ret = watchdog_register_device(wdd);
|
||||
if (ret) {
|
||||
outb(LOCK, wdt->io_base + WDT_REG_LOCK);
|
||||
dev_err(dev, "failed to register watchdog\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n",
|
||||
wdt->io_base, timeout, nowayout);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nic7018_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct nic7018_wdt *wdt = platform_get_drvdata(pdev);
|
||||
|
||||
watchdog_unregister_device(&wdt->wdd);
|
||||
|
||||
/* Lock WDT register */
|
||||
outb(LOCK, wdt->io_base + WDT_REG_LOCK);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct acpi_device_id nic7018_device_ids[] = {
|
||||
{"NIC7018", 0},
|
||||
{"", 0},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(acpi, nic7018_device_ids);
|
||||
|
||||
static struct platform_driver watchdog_driver = {
|
||||
.probe = nic7018_probe,
|
||||
.remove = nic7018_remove,
|
||||
.driver = {
|
||||
.name = KBUILD_MODNAME,
|
||||
.acpi_match_table = ACPI_PTR(nic7018_device_ids),
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(watchdog_driver);
|
||||
|
||||
MODULE_DESCRIPTION("National Instruments NIC7018 Watchdog driver");
|
||||
MODULE_AUTHOR("Hui Chun Ong <hui.chun.ong@ni.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user