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Merge git://www.linux-watchdog.org/linux-watchdog

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Pull watchdog updates from Wim Van Sebroeck:
 "This adds following items:

   - watchdog restart handler support
   - watchdog reboot notifier support
   - watchdog sysfs attributes
   - support for the following new devices: AMD Mullins platform, AMD
     Carrizo platform, meson8b SoC, CSRatlas7, TS-4800, Alphascale
     asm9260-wdt, Zodiac, Sigma Designs SMP86xx/SMP87xx
   - Changes in refcounting for the watchdog core
   - watchdog core improvements
   - and small fixes"

* git://www.linux-watchdog.org/linux-watchdog: (60 commits)
  watchdog: asm9260: remove __init and __exit annotations
  watchdog: Drop pointer to watchdog device from struct watchdog_device
  watchdog: ziirave: Use watchdog infrastructure to create sysfs attributes
  watchdog: Add support for creating driver specific sysfs attributes
  watchdog: kill unref/ref ops
  watchdog: stmp3xxx: Remove unused variables
  watchdog: add MT7621 watchdog support
  hwmon: (sch56xx) Drop watchdog driver data reference count callbacks
  watchdog: da9055_wdt: Drop reference counting
  watchdog: da9052_wdt: Drop reference counting
  watchdog: Separate and maintain variables based on variable lifetime
  watchdog: diag288: Stop re-using watchdog core internal flags
  watchdog: Create watchdog device in watchdog_dev.c
  watchdog: qcom-wdt: Do not set 'dev' in struct watchdog_device
  watchdog: mena21: Do not use device pointer from struct watchdog_device
  watchdog: gpio: Do not use device pointer from struct watchdog_device
  watchdog: tangox: Print info message using pointer to platform device
  watchdog: bcm2835_wdt: Drop log message if watchdog is stopped
  devicetree: watchdog: add binding for Sigma Designs SMP8642 watchdog
  watchdog: add support for Sigma Designs SMP86xx/SMP87xx
  ...
This commit is contained in:
Linus Torvalds 2016-01-17 12:15:38 -08:00
commit 6606b342fe
48 changed files with 2693 additions and 837 deletions
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51
Documentation/ABI/testing/sysfs-class-watchdog Normal file
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@ -0,0 +1,51 @@
What: /sys/class/watchdog/watchdogn/bootstatus
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains status of the watchdog
device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
ioctl interface.
What: /sys/class/watchdog/watchdogn/identity
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains identity string of
watchdog device.
What: /sys/class/watchdog/watchdogn/nowayout
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. While reading, it gives '1' if that
device supports nowayout feature else, it gives '0'.
What: /sys/class/watchdog/watchdogn/state
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It gives active/inactive status of
watchdog device.
What: /sys/class/watchdog/watchdogn/status
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains watchdog device's
internal status bits. It is equivalent to WDIOC_GETSTATUS
of ioctl interface.
What: /sys/class/watchdog/watchdogn/timeleft
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains value of time left for
reset generation. It is equivalent to WDIOC_GETTIMELEFT of
ioctl interface.
What: /sys/class/watchdog/watchdogn/timeout
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It is read to know about current
value of timeout programmed.

35
Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt Normal file
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@ -0,0 +1,35 @@
Alphascale asm9260 Watchdog timer
Required properties:
- compatible : should be "alphascale,asm9260-wdt".
- reg : Specifies base physical address and size of the registers.
- clocks : the clocks feeding the watchdog timer. See clock-bindings.txt
- clock-names : should be set to
"mod" - source for tick counter.
"ahb" - ahb gate.
- resets : phandle pointing to the system reset controller with
line index for the watchdog.
- reset-names : should be set to "wdt_rst".
Optional properties:
- timeout-sec : shall contain the default watchdog timeout in seconds,
if unset, the default timeout is 30 seconds.
- alphascale,mode : three modes are supported
"hw" - hw reset (default).
"sw" - sw reset.
"debug" - no action is taken.
Example:
watchdog0: watchdog@80048000 {
compatible = "alphascale,asm9260-wdt";
reg = <0x80048000 0x10>;
clocks = <&acc CLKID_SYS_WDT>, <&acc CLKID_AHB_WDT>;
clock-names = "mod", "ahb";
interrupts = <55>;
resets = <&rst WDT_RESET>;
reset-names = "wdt_rst";
timeout-sec = <30>;
alphascale,mode = "hw";
};

12
Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt Normal file
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@ -0,0 +1,12 @@
Ralink Watchdog Timers
Required properties:
- compatible: must be "mediatek,mt7621-wdt"
- reg: physical base address of the controller and length of the register range
Example:
watchdog@100 {
compatible = "mediatek,mt7621-wdt";
reg = <0x100 0x10>;
};

18
Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt Normal file
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@ -0,0 +1,18 @@
Sigma Designs SMP86xx/SMP87xx watchdog
Required properties:
- compatible: Should be "sigma,smp8642-wdt"
- reg: Specifies the physical address region
- clocks: Should be a phandle to the clock
Optional properties:
- timeout-sec: watchdog timeout in seconds
Example:
watchdog@1fd00 {
compatible = "sigma,smp8642-wdt";
reg = <0x1fd00 8>;
clocks = <&xtal_in_clk>;
timeout-sec = <30>;
};

25
Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt Normal file
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@ -0,0 +1,25 @@
Technologic Systems Watchdog
Required properties:
- compatible: must be "technologic,ts4800-wdt"
- syscon: phandle / integer array that points to the syscon node which
describes the FPGA's syscon registers.
- phandle to FPGA's syscon
- offset to the watchdog register
Optional property:
- timeout-sec: contains the watchdog timeout in seconds.
Example:
syscon: syscon@b0010000 {
compatible = "syscon", "simple-mfd";
reg = <0xb0010000 0x3d>;
reg-io-width = <2>;
wdt@e {
compatible = "technologic,ts4800-wdt";
syscon = <&syscon 0xe>;
timeout-sec = <10>;
};
}

19
Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt Normal file
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@ -0,0 +1,19 @@
Zodiac RAVE Watchdog Timer
Required properties:
- compatible: must be "zii,rave-wdt"
- reg: i2c slave address of device, usually 0x38
Optional Properties:
- timeout-sec: Watchdog timeout value in seconds.
- reset-duration-ms: Duration of the pulse generated when the watchdog times
out. Value in milliseconds.
Example:
watchdog@38 {
compatible = "zii,rave-wdt";
reg = <0x38>;
timeout-sec = <30>;
reset-duration-ms = <30>;
};

77
Documentation/watchdog/watchdog-kernel-api.txt
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@ -44,17 +44,18 @@ The watchdog device structure looks like this:
struct watchdog_device {
int id;
struct cdev cdev;
struct device *dev;
struct device *parent;
const struct attribute_group **groups;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
unsigned int bootstatus;
unsigned int timeout;
unsigned int min_timeout;
unsigned int max_timeout;
struct notifier_block reboot_nb;
struct notifier_block restart_nb;
void *driver_data;
struct mutex lock;
struct watchdog_core_data *wd_data;
unsigned long status;
struct list_head deferred;
};
@ -64,27 +65,32 @@ It contains following fields:
/dev/watchdog0 cdev (dynamic major, minor 0) as well as the old
/dev/watchdog miscdev. The id is set automatically when calling
watchdog_register_device.
* cdev: cdev for the dynamic /dev/watchdog<id> device nodes. This
field is also populated by watchdog_register_device.
* dev: device under the watchdog class (created by watchdog_register_device).
* parent: set this to the parent device (or NULL) before calling
watchdog_register_device.
* groups: List of sysfs attribute groups to create when creating the watchdog
device.
* info: a pointer to a watchdog_info structure. This structure gives some
additional information about the watchdog timer itself. (Like it's unique name)
* ops: a pointer to the list of watchdog operations that the watchdog supports.
* timeout: the watchdog timer's timeout value (in seconds).
* min_timeout: the watchdog timer's minimum timeout value (in seconds).
* max_timeout: the watchdog timer's maximum timeout value (in seconds).
* reboot_nb: notifier block that is registered for reboot notifications, for
internal use only. If the driver calls watchdog_stop_on_reboot, watchdog core
will stop the watchdog on such notifications.
* restart_nb: notifier block that is registered for machine restart, for
internal use only. If a watchdog is capable of restarting the machine, it
should define ops->restart. Priority can be changed through
watchdog_set_restart_priority.
* bootstatus: status of the device after booting (reported with watchdog
WDIOF_* status bits).
* driver_data: a pointer to the drivers private data of a watchdog device.
This data should only be accessed via the watchdog_set_drvdata and
watchdog_get_drvdata routines.
* lock: Mutex for WatchDog Timer Driver Core internal use only.
* wd_data: a pointer to watchdog core internal data.
* status: this field contains a number of status bits that give extra
information about the status of the device (Like: is the watchdog timer
running/active, is the nowayout bit set, is the device opened via
the /dev/watchdog interface or not, ...).
running/active, or is the nowayout bit set).
* deferred: entry in wtd_deferred_reg_list which is used to
register early initialized watchdogs.
@ -100,8 +106,9 @@ struct watchdog_ops {
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
unsigned int (*get_timeleft)(struct watchdog_device *);
void (*ref)(struct watchdog_device *);
void (*unref)(struct watchdog_device *);
int (*restart)(struct watchdog_device *);
void (*ref)(struct watchdog_device *) __deprecated;
void (*unref)(struct watchdog_device *) __deprecated;
long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
};
@ -110,20 +117,6 @@ driver's operations. This module owner will be used to lock the module when
the watchdog is active. (This to avoid a system crash when you unload the
module and /dev/watchdog is still open).
If the watchdog_device struct is dynamically allocated, just locking the module
is not enough and a driver also needs to define the ref and unref operations to
ensure the structure holding the watchdog_device does not go away.
The simplest (and usually sufficient) implementation of this is to:
1) Add a kref struct to the same structure which is holding the watchdog_device
2) Define a release callback for the kref which frees the struct holding both
3) Call kref_init on this kref *before* calling watchdog_register_device()
4) Define a ref operation calling kref_get on this kref
5) Define a unref operation calling kref_put on this kref
6) When it is time to cleanup:
* Do not kfree() the struct holding both, the last kref_put will do this!
* *After* calling watchdog_unregister_device() call kref_put on the kref
Some operations are mandatory and some are optional. The mandatory operations
are:
* start: this is a pointer to the routine that starts the watchdog timer
@ -164,34 +157,23 @@ they are supported. These optional routines/operations are:
(Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the
watchdog's info structure).
* get_timeleft: this routines returns the time that's left before a reset.
* ref: the operation that calls kref_get on the kref of a dynamically
allocated watchdog_device struct.
* unref: the operation that calls kref_put on the kref of a dynamically
allocated watchdog_device struct.
* restart: this routine restarts the machine. It returns 0 on success or a
negative errno code for failure.
* ioctl: if this routine is present then it will be called first before we do
our own internal ioctl call handling. This routine should return -ENOIOCTLCMD
if a command is not supported. The parameters that are passed to the ioctl
call are: watchdog_device, cmd and arg.
The 'ref' and 'unref' operations are no longer used and deprecated.
The status bits should (preferably) be set with the set_bit and clear_bit alike
bit-operations. The status bits that are defined are:
* WDOG_ACTIVE: this status bit indicates whether or not a watchdog timer device
is active or not. When the watchdog is active after booting, then you should
set this status bit (Note: when you register the watchdog timer device with
this bit set, then opening /dev/watchdog will skip the start operation)
* WDOG_DEV_OPEN: this status bit shows whether or not the watchdog device
was opened via /dev/watchdog.
(This bit should only be used by the WatchDog Timer Driver Core).
* WDOG_ALLOW_RELEASE: this bit stores whether or not the magic close character
has been sent (so that we can support the magic close feature).
(This bit should only be used by the WatchDog Timer Driver Core).
* WDOG_NO_WAY_OUT: this bit stores the nowayout setting for the watchdog.
If this bit is set then the watchdog timer will not be able to stop.
* WDOG_UNREGISTERED: this bit gets set by the WatchDog Timer Driver Core
after calling watchdog_unregister_device, and then checked before calling
any watchdog_ops, so that you can be sure that no operations (other then
unref) will get called after unregister, even if userspace still holds a
reference to /dev/watchdog
To set the WDOG_NO_WAY_OUT status bit (before registering your watchdog
timer device) you can either:
@ -231,3 +213,18 @@ the device tree (if the module timeout parameter is invalid). Best practice is
to set the default timeout value as timeout value in the watchdog_device and
then use this function to set the user "preferred" timeout value.
This routine returns zero on success and a negative errno code for failure.
To disable the watchdog on reboot, the user must call the following helper:
static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd);
To change the priority of the restart handler the following helper should be
used:
void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority);
User should follow the following guidelines for setting the priority:
* 0: should be called in last resort, has limited restart capabilities
* 128: default restart handler, use if no other handler is expected to be
available, and/or if restart is sufficient to restart the entire system
* 255: highest priority, will preempt all other restart handlers

1
MAINTAINERS
View File

@ -11676,6 +11676,7 @@ F: drivers/input/tablet/wacom_serial4.c
WATCHDOG DEVICE DRIVERS
M: Wim Van Sebroeck <wim@iguana.be>
R: Guenter Roeck <linux@roeck-us.net>
L: linux-watchdog@vger.kernel.org
W: http://www.linux-watchdog.org/
T: git git://www.linux-watchdog.org/linux-watchdog.git

31
drivers/hwmon/sch56xx-common.c
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@ -30,7 +30,6 @@
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/kref.h>
#include <linux/slab.h>
#include "sch56xx-common.h"
@ -67,7 +66,6 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
struct sch56xx_watchdog_data {
u16 addr;
struct mutex *io_lock;
struct kref kref;
struct watchdog_info wdinfo;
struct watchdog_device wddev;
u8 watchdog_preset;
@ -258,15 +256,6 @@ EXPORT_SYMBOL(sch56xx_read_virtual_reg12);
* Watchdog routines
*/
/* Release our data struct when we're unregistered *and*
all references to our watchdog device are released */
static void watchdog_release_resources(struct kref *r)
{
struct sch56xx_watchdog_data *data =
container_of(r, struct sch56xx_watchdog_data, kref);
kfree(data);
}
static int watchdog_set_timeout(struct watchdog_device *wddev,
unsigned int timeout)
{
@ -395,28 +384,12 @@ static int watchdog_stop(struct watchdog_device *wddev)
return 0;
}
static void watchdog_ref(struct watchdog_device *wddev)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
kref_get(&data->kref);
}
static void watchdog_unref(struct watchdog_device *wddev)
{
struct sch56xx_watchdog_data *data = watchdog_get_drvdata(wddev);
kref_put(&data->kref, watchdog_release_resources);
}
static const struct watchdog_ops watchdog_ops = {
.owner = THIS_MODULE,
.start = watchdog_start,
.stop = watchdog_stop,
.ping = watchdog_trigger,
.set_timeout = watchdog_set_timeout,
.ref = watchdog_ref,
.unref = watchdog_unref,
};
struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
@ -448,7 +421,6 @@ struct sch56xx_watchdog_data *sch56xx_watchdog_register(struct device *parent,
data->addr = addr;
data->io_lock = io_lock;
kref_init(&data->kref);
strlcpy(data->wdinfo.identity, "sch56xx watchdog",
sizeof(data->wdinfo.identity));
@ -494,8 +466,7 @@ EXPORT_SYMBOL(sch56xx_watchdog_register);
void sch56xx_watchdog_unregister(struct sch56xx_watchdog_data *data)
{
watchdog_unregister_device(&data->wddev);
kref_put(&data->kref, watchdog_release_resources);
/* Don't touch data after this it may have been free-ed! */
kfree(data);
}
EXPORT_SYMBOL(sch56xx_watchdog_unregister);

65
drivers/watchdog/Kconfig
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@ -46,6 +46,13 @@ config WATCHDOG_NOWAYOUT
get killed. If you say Y here, the watchdog cannot be stopped once
it has been started.
config WATCHDOG_SYSFS
bool "Read different watchdog information through sysfs"
default n
help
Say Y here if you want to enable watchdog device status read through
sysfs attributes.
#
# General Watchdog drivers
#
@ -135,6 +142,16 @@ config MENF21BMC_WATCHDOG
This driver can also be built as a module. If so the module
will be called menf21bmc_wdt.
config TANGOX_WATCHDOG
tristate "Sigma Designs SMP86xx/SMP87xx watchdog"
select WATCHDOG_CORE
depends on ARCH_TANGOX || COMPILE_TEST
help
Support for the watchdog in Sigma Designs SMP86xx (tango3)
and SMP87xx (tango4) family chips.
This driver can be built as a module. The module name is tangox_wdt.
config WM831X_WATCHDOG
tristate "WM831x watchdog"
depends on MFD_WM831X
@ -161,6 +178,17 @@ config XILINX_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called of_xilinx_wdt.
config ZIIRAVE_WATCHDOG
tristate "Zodiac RAVE Watchdog Timer"
depends on I2C
select WATCHDOG_CORE
help
Watchdog driver for the Zodiac Aerospace RAVE Switch Watchdog
Processor.
To compile this driver as a module, choose M here: the
module will be called ziirave_wdt.
# ALPHA Architecture
# ARM Architecture
@ -173,6 +201,16 @@ config ARM_SP805_WATCHDOG
ARM Primecell SP805 Watchdog timer. This will reboot your system when
the timeout is reached.
config ASM9260_WATCHDOG
tristate "Alphascale ASM9260 watchdog"
depends on MACH_ASM9260
depends on OF
select WATCHDOG_CORE
select RESET_CONTROLLER
help
Watchdog timer embedded into Alphascale asm9260 chips. This will reboot your
system when the timeout is reached.
config AT91RM9200_WATCHDOG
tristate "AT91RM9200 watchdog"
depends on SOC_AT91RM9200 && MFD_SYSCON
@ -426,6 +464,16 @@ config NUC900_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called nuc900_wdt.
config TS4800_WATCHDOG
tristate "TS-4800 Watchdog"
depends on HAS_IOMEM && OF
select WATCHDOG_CORE
select MFD_SYSCON
help
Technologic Systems TS-4800 has watchdog timer implemented in
an external FPGA. Say Y here if you want to support for the
watchdog timer on TS-4800 board.
config TS72XX_WATCHDOG
tristate "TS-72XX SBC Watchdog"
depends on MACH_TS72XX
@ -578,6 +626,16 @@ config LPC18XX_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called lpc18xx_wdt.
config ATLAS7_WATCHDOG
tristate "CSRatlas7 watchdog"
depends on ARCH_ATLAS7
help
Say Y here to include Watchdog timer support for the watchdog
existing on the CSRatlas7 series platforms.
To compile this driver as a module, choose M here: the
module will be called atlas7_wdt.
# AVR32 Architecture
config AT32AP700X_WDT
@ -1345,6 +1403,13 @@ config RALINK_WDT
help
Hardware driver for the Ralink SoC Watchdog Timer.
config MT7621_WDT
tristate "Mediatek SoC watchdog"
select WATCHDOG_CORE
depends on SOC_MT7620 || SOC_MT7621
help
Hardware driver for the Mediatek/Ralink MT7621/8 SoC Watchdog Timer.
# PARISC Architecture
# POWERPC Architecture

6
drivers/watchdog/Makefile
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@ -30,6 +30,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
# ARM Architecture
obj-$(CONFIG_ARM_SP805_WATCHDOG) += sp805_wdt.o
obj-$(CONFIG_ASM9260_WATCHDOG) += asm9260_wdt.o
obj-$(CONFIG_AT91RM9200_WATCHDOG) += at91rm9200_wdt.o
obj-$(CONFIG_AT91SAM9X_WATCHDOG) += at91sam9_wdt.o
obj-$(CONFIG_CADENCE_WATCHDOG) += cadence_wdt.o
@ -53,6 +54,7 @@ obj-$(CONFIG_RN5T618_WATCHDOG) += rn5t618_wdt.o
obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
obj-$(CONFIG_STMP3XXX_RTC_WATCHDOG) += stmp3xxx_rtc_wdt.o
obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o
obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o
obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o
@ -69,6 +71,7 @@ obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o
obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o
obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o
obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o
# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
@ -149,6 +152,7 @@ octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o
obj-$(CONFIG_LANTIQ_WDT) += lantiq_wdt.o
obj-$(CONFIG_RALINK_WDT) += rt2880_wdt.o
obj-$(CONFIG_IMGPDC_WDT) += imgpdc_wdt.o
obj-$(CONFIG_MT7621_WDT) += mt7621_wdt.o
# PARISC Architecture
@ -187,8 +191,10 @@ obj-$(CONFIG_DA9055_WATCHDOG) += da9055_wdt.o
obj-$(CONFIG_DA9062_WATCHDOG) += da9062_wdt.o
obj-$(CONFIG_DA9063_WATCHDOG) += da9063_wdt.o
obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o
obj-$(CONFIG_TANGOX_WATCHDOG) += tangox_wdt.o
obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o
obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o

403
drivers/watchdog/asm9260_wdt.c Normal file
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@ -0,0 +1,403 @@
/*
* Watchdog driver for Alphascale ASM9260.
*
* Copyright (c) 2014 Oleksij Rempel <linux@rempel-privat.de>
*
* Licensed under GPLv2 or later.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/reset.h>
#include <linux/watchdog.h>
#define CLOCK_FREQ 1000000
/* Watchdog Mode register */
#define HW_WDMOD 0x00
/* Wake interrupt. Set by HW, can't be cleared. */
#define BM_MOD_WDINT BIT(3)
/* This bit set if timeout reached. Cleared by SW. */
#define BM_MOD_WDTOF BIT(2)
/* HW Reset on timeout */
#define BM_MOD_WDRESET BIT(1)
/* WD enable */
#define BM_MOD_WDEN BIT(0)
/*
* Watchdog Timer Constant register
* Minimal value is 0xff, the meaning of this value
* depends on used clock: T = WDCLK * (0xff + 1) * 4
*/
#define HW_WDTC 0x04
#define BM_WDTC_MAX(freq) (0x7fffffff / (freq))
/* Watchdog Feed register */
#define HW_WDFEED 0x08
/* Watchdog Timer Value register */
#define HW_WDTV 0x0c
#define ASM9260_WDT_DEFAULT_TIMEOUT 30
enum asm9260_wdt_mode {
HW_RESET,
SW_RESET,
DEBUG,
};
struct asm9260_wdt_priv {
struct device *dev;
struct watchdog_device wdd;
struct clk *clk;
struct clk *clk_ahb;
struct reset_control *rst;
struct notifier_block restart_handler;
void __iomem *iobase;
int irq;
unsigned long wdt_freq;
enum asm9260_wdt_mode mode;
};
static int asm9260_wdt_feed(struct watchdog_device *wdd)
{
struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd);
iowrite32(0xaa, priv->iobase + HW_WDFEED);
iowrite32(0x55, priv->iobase + HW_WDFEED);
return 0;
}
static unsigned int asm9260_wdt_gettimeleft(struct watchdog_device *wdd)
{
struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd);
u32 counter;
counter = ioread32(priv->iobase + HW_WDTV);
return DIV_ROUND_CLOSEST(counter, priv->wdt_freq);
}
static int asm9260_wdt_updatetimeout(struct watchdog_device *wdd)
{
struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd);
u32 counter;
counter = wdd->timeout * priv->wdt_freq;
iowrite32(counter, priv->iobase + HW_WDTC);
return 0;
}
static int asm9260_wdt_enable(struct watchdog_device *wdd)
{
struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd);
u32 mode = 0;
if (priv->mode == HW_RESET)
mode = BM_MOD_WDRESET;
iowrite32(BM_MOD_WDEN | mode, priv->iobase + HW_WDMOD);
asm9260_wdt_updatetimeout(wdd);
asm9260_wdt_feed(wdd);
return 0;
}
static int asm9260_wdt_disable(struct watchdog_device *wdd)
{
struct asm9260_wdt_priv *priv = watchdog_get_drvdata(wdd);
/* The only way to disable WD is to reset it. */
reset_control_assert(priv->rst);
reset_control_deassert(priv->rst);
return 0;
}
static int asm9260_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
{
wdd->timeout = to;
asm9260_wdt_updatetimeout(wdd);
return 0;
}
static void asm9260_wdt_sys_reset(struct asm9260_wdt_priv *priv)
{
/* init WD if it was not started */
iowrite32(BM_MOD_WDEN | BM_MOD_WDRESET, priv->iobase + HW_WDMOD);
iowrite32(0xff, priv->iobase + HW_WDTC);
/* first pass correct sequence */
asm9260_wdt_feed(&priv->wdd);
/*
* Then write wrong pattern to the feed to trigger reset
* ASAP.
*/
iowrite32(0xff, priv->iobase + HW_WDFEED);
mdelay(1000);
}
static irqreturn_t asm9260_wdt_irq(int irq, void *devid)
{
struct asm9260_wdt_priv *priv = devid;
u32 stat;
stat = ioread32(priv->iobase + HW_WDMOD);
if (!(stat & BM_MOD_WDINT))
return IRQ_NONE;
if (priv->mode == DEBUG) {
dev_info(priv->dev, "Watchdog Timeout. Do nothing.\n");
} else {
dev_info(priv->dev, "Watchdog Timeout. Doing SW Reset.\n");
asm9260_wdt_sys_reset(priv);
}
return IRQ_HANDLED;
}
static int asm9260_restart_handler(struct notifier_block *this,
unsigned long mode, void *cmd)
{
struct asm9260_wdt_priv *priv =
container_of(this, struct asm9260_wdt_priv, restart_handler);
asm9260_wdt_sys_reset(priv);
return NOTIFY_DONE;
}
static const struct watchdog_info asm9260_wdt_ident = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING
| WDIOF_MAGICCLOSE,
.identity = "Alphascale asm9260 Watchdog",
};
static struct watchdog_ops asm9260_wdt_ops = {
.owner = THIS_MODULE,
.start = asm9260_wdt_enable,
.stop = asm9260_wdt_disable,
.get_timeleft = asm9260_wdt_gettimeleft,
.ping = asm9260_wdt_feed,
.set_timeout = asm9260_wdt_settimeout,
};
static int asm9260_wdt_get_dt_clks(struct asm9260_wdt_priv *priv)
{
int err;
unsigned long clk;
priv->clk = devm_clk_get(priv->dev, "mod");
if (IS_ERR(priv->clk)) {
dev_err(priv->dev, "Failed to get \"mod\" clk\n");
return PTR_ERR(priv->clk);
}
/* configure AHB clock */
priv->clk_ahb = devm_clk_get(priv->dev, "ahb");
if (IS_ERR(priv->clk_ahb)) {
dev_err(priv->dev, "Failed to get \"ahb\" clk\n");
return PTR_ERR(priv->clk_ahb);
}
err = clk_prepare_enable(priv->clk_ahb);
if (err) {
dev_err(priv->dev, "Failed to enable ahb_clk!\n");
return err;
}
err = clk_set_rate(priv->clk, CLOCK_FREQ);
if (err) {
clk_disable_unprepare(priv->clk_ahb);
dev_err(priv->dev, "Failed to set rate!\n");
return err;
}
err = clk_prepare_enable(priv->clk);
if (err) {
clk_disable_unprepare(priv->clk_ahb);
dev_err(priv->dev, "Failed to enable clk!\n");
return err;
}
/* wdt has internal divider */
clk = clk_get_rate(priv->clk);
if (!clk) {
clk_disable_unprepare(priv->clk);
clk_disable_unprepare(priv->clk_ahb);
dev_err(priv->dev, "Failed, clk is 0!\n");
return -EINVAL;
}
priv->wdt_freq = clk / 2;
return 0;
}
static void asm9260_wdt_get_dt_mode(struct asm9260_wdt_priv *priv)
{
const char *tmp;
int ret;
/* default mode */
priv->mode = HW_RESET;
ret = of_property_read_string(priv->dev->of_node,
"alphascale,mode", &tmp);
if (ret < 0)
return;
if (!strcmp(tmp, "hw"))
priv->mode = HW_RESET;
else if (!strcmp(tmp, "sw"))
priv->mode = SW_RESET;
else if (!strcmp(tmp, "debug"))
priv->mode = DEBUG;
else
dev_warn(priv->dev, "unknown reset-type: %s. Using default \"hw\" mode.",
tmp);
}
static int asm9260_wdt_probe(struct platform_device *pdev)
{
struct asm9260_wdt_priv *priv;
struct watchdog_device *wdd;
struct resource *res;
int ret;
const char * const mode_name[] = { "hw", "sw", "debug", };
priv = devm_kzalloc(&pdev->dev, sizeof(struct asm9260_wdt_priv),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->iobase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->iobase))
return PTR_ERR(priv->iobase);
ret = asm9260_wdt_get_dt_clks(priv);
if (ret)
return ret;
priv->rst = devm_reset_control_get(&pdev->dev, "wdt_rst");
if (IS_ERR(priv->rst))
return PTR_ERR(priv->rst);
wdd = &priv->wdd;
wdd->info = &asm9260_wdt_ident;
wdd->ops = &asm9260_wdt_ops;
wdd->min_timeout = 1;
wdd->max_timeout = BM_WDTC_MAX(priv->wdt_freq);
wdd->parent = &pdev->dev;
watchdog_set_drvdata(wdd, priv);
/*
* If 'timeout-sec' unspecified in devicetree, assume a 30 second
* default, unless the max timeout is less than 30 seconds, then use
* the max instead.
*/
wdd->timeout = ASM9260_WDT_DEFAULT_TIMEOUT;
watchdog_init_timeout(wdd, 0, &pdev->dev);
asm9260_wdt_get_dt_mode(priv);
if (priv->mode != HW_RESET)
priv->irq = platform_get_irq(pdev, 0);
if (priv->irq > 0) {
/*
* Not all supported platforms specify an interrupt for the
* watchdog, so let's make it optional.
*/
ret = devm_request_irq(&pdev->dev, priv->irq,
asm9260_wdt_irq, 0, pdev->name, priv);
if (ret < 0)
dev_warn(&pdev->dev, "failed to request IRQ\n");
}
ret = watchdog_register_device(wdd);
if (ret)
goto clk_off;
platform_set_drvdata(pdev, priv);
priv->restart_handler.notifier_call = asm9260_restart_handler;
priv->restart_handler.priority = 128;
ret = register_restart_handler(&priv->restart_handler);
if (ret)
dev_warn(&pdev->dev, "cannot register restart handler\n");
dev_info(&pdev->dev, "Watchdog enabled (timeout: %d sec, mode: %s)\n",
wdd->timeout, mode_name[priv->mode]);
return 0;
clk_off:
clk_disable_unprepare(priv->clk);
clk_disable_unprepare(priv->clk_ahb);
return ret;
}
static void asm9260_wdt_shutdown(struct platform_device *pdev)
{
struct asm9260_wdt_priv *priv = platform_get_drvdata(pdev);
asm9260_wdt_disable(&priv->wdd);
}
static int asm9260_wdt_remove(struct platform_device *pdev)
{
struct asm9260_wdt_priv *priv = platform_get_drvdata(pdev);
asm9260_wdt_disable(&priv->wdd);
unregister_restart_handler(&priv->restart_handler);
watchdog_unregister_device(&priv->wdd);
clk_disable_unprepare(priv->clk);
clk_disable_unprepare(priv->clk_ahb);
return 0;
}
static const struct of_device_id asm9260_wdt_of_match[] = {
{ .compatible = "alphascale,asm9260-wdt"},
{},
};
MODULE_DEVICE_TABLE(of, asm9260_wdt_of_match);
static struct platform_driver asm9260_wdt_driver = {
.driver = {
.name = "asm9260-wdt",
.owner = THIS_MODULE,
.of_match_table = asm9260_wdt_of_match,
},
.probe = asm9260_wdt_probe,
.remove = asm9260_wdt_remove,
.shutdown = asm9260_wdt_shutdown,
};
module_platform_driver(asm9260_wdt_driver);
MODULE_DESCRIPTION("asm9260 WatchDog Timer Driver");
MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>");
MODULE_LICENSE("GPL");

242
drivers/watchdog/atlas7_wdt.c Normal file
View File

@ -0,0 +1,242 @@
/*
* Watchdog driver for CSR Atlas7
*
* Copyright (c) 2015 Cambridge Silicon Radio Limited, a CSR plc group company.
*
* Licensed under GPLv2.
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/watchdog.h>
#define ATLAS7_TIMER_WDT_INDEX 5
#define ATLAS7_WDT_DEFAULT_TIMEOUT 20
#define ATLAS7_WDT_CNT_CTRL (0 + 4 * ATLAS7_TIMER_WDT_INDEX)
#define ATLAS7_WDT_CNT_MATCH (0x18 + 4 * ATLAS7_TIMER_WDT_INDEX)
#define ATLAS7_WDT_CNT (0x48 + 4 * ATLAS7_TIMER_WDT_INDEX)
#define ATLAS7_WDT_CNT_EN (BIT(0) | BIT(1))
#define ATLAS7_WDT_EN 0x64
static unsigned int timeout = ATLAS7_WDT_DEFAULT_TIMEOUT;
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(timeout, uint, 0);
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)");
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
struct atlas7_wdog {
struct device *dev;
void __iomem *base;
unsigned long tick_rate;
struct clk *clk;
};
static unsigned int atlas7_wdt_gettimeleft(struct watchdog_device *wdd)
{
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
u32 counter, match, delta;
counter = readl(wdt->base + ATLAS7_WDT_CNT);
match = readl(wdt->base + ATLAS7_WDT_CNT_MATCH);
delta = match - counter;
return delta / wdt->tick_rate;
}
static int atlas7_wdt_ping(struct watchdog_device *wdd)
{
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
u32 counter, match, delta;
counter = readl(wdt->base + ATLAS7_WDT_CNT);
delta = wdd->timeout * wdt->tick_rate;
match = counter + delta;
writel(match, wdt->base + ATLAS7_WDT_CNT_MATCH);
return 0;
}
static int atlas7_wdt_enable(struct watchdog_device *wdd)
{
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
atlas7_wdt_ping(wdd);
writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) | ATLAS7_WDT_CNT_EN,
wdt->base + ATLAS7_WDT_CNT_CTRL);
writel(1, wdt->base + ATLAS7_WDT_EN);
return 0;
}
static int atlas7_wdt_disable(struct watchdog_device *wdd)
{
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
writel(0, wdt->base + ATLAS7_WDT_EN);
writel(readl(wdt->base + ATLAS7_WDT_CNT_CTRL) & ~ATLAS7_WDT_CNT_EN,
wdt->base + ATLAS7_WDT_CNT_CTRL);
return 0;
}
static int atlas7_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)
{
wdd->timeout = to;
return 0;
}
#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
static const struct watchdog_info atlas7_wdt_ident = {
.options = OPTIONS,
.firmware_version = 0,
.identity = "atlas7 Watchdog",
};
static struct watchdog_ops atlas7_wdt_ops = {
.owner = THIS_MODULE,
.start = atlas7_wdt_enable,
.stop = atlas7_wdt_disable,
.get_timeleft = atlas7_wdt_gettimeleft,
.ping = atlas7_wdt_ping,
.set_timeout = atlas7_wdt_settimeout,
};
static struct watchdog_device atlas7_wdd = {
.info = &atlas7_wdt_ident,
.ops = &atlas7_wdt_ops,
.timeout = ATLAS7_WDT_DEFAULT_TIMEOUT,
};
static const struct of_device_id atlas7_wdt_ids[] = {
{ .compatible = "sirf,atlas7-tick"},
{}
};
static int atlas7_wdt_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct atlas7_wdog *wdt;
struct resource *res;
struct clk *clk;
int ret;
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
wdt->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(wdt->base))
return PTR_ERR(wdt->base);
clk = of_clk_get(np, 0);
if (IS_ERR(clk))
return PTR_ERR(clk);
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(&pdev->dev, "clk enable failed\n");
goto err;
}
/* disable watchdog hardware */
writel(0, wdt->base + ATLAS7_WDT_CNT_CTRL);
wdt->tick_rate = clk_get_rate(clk);
wdt->clk = clk;
atlas7_wdd.min_timeout = 1;
atlas7_wdd.max_timeout = UINT_MAX / wdt->tick_rate;
watchdog_init_timeout(&atlas7_wdd, 0, &pdev->dev);
watchdog_set_nowayout(&atlas7_wdd, nowayout);
watchdog_set_drvdata(&atlas7_wdd, wdt);
platform_set_drvdata(pdev, &atlas7_wdd);
ret = watchdog_register_device(&atlas7_wdd);
if (ret)
goto err1;
return 0;
err1:
clk_disable_unprepare(clk);
err:
clk_put(clk);
return ret;
}
static void atlas7_wdt_shutdown(struct platform_device *pdev)
{
struct watchdog_device *wdd = platform_get_drvdata(pdev);
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
atlas7_wdt_disable(wdd);
clk_disable_unprepare(wdt->clk);
}
static int atlas7_wdt_remove(struct platform_device *pdev)
{
struct watchdog_device *wdd = platform_get_drvdata(pdev);
struct atlas7_wdog *wdt = watchdog_get_drvdata(wdd);
atlas7_wdt_shutdown(pdev);
clk_put(wdt->clk);
return 0;
}
static int __maybe_unused atlas7_wdt_suspend(struct device *dev)
{
/*
* NOTE:timer controller registers settings are saved
* and restored back by the timer-atlas7.c
*/
return 0;
}
static int __maybe_unused atlas7_wdt_resume(struct device *dev)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
/*
* NOTE: Since timer controller registers settings are saved
* and restored back by the timer-atlas7.c, so we need not
* update WD settings except refreshing timeout.
*/
atlas7_wdt_ping(wdd);
return 0;
}
static SIMPLE_DEV_PM_OPS(atlas7_wdt_pm_ops,
atlas7_wdt_suspend, atlas7_wdt_resume);
MODULE_DEVICE_TABLE(of, atlas7_wdt_ids);
static struct platform_driver atlas7_wdt_driver = {
.driver = {
.name = "atlas7-wdt",
.pm = &atlas7_wdt_pm_ops,
.of_match_table = atlas7_wdt_ids,
},
.probe = atlas7_wdt_probe,
.remove = atlas7_wdt_remove,
.shutdown = atlas7_wdt_shutdown,
};
module_platform_driver(atlas7_wdt_driver);
MODULE_DESCRIPTION("CSRatlas7 watchdog driver");
MODULE_AUTHOR("Guo Zeng <Guo.Zeng@csr.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:atlas7-wdt");

1
drivers/watchdog/bcm2835_wdt.c
View File

@ -79,7 +79,6 @@ static int bcm2835_wdt_stop(struct watchdog_device *wdog)
struct bcm2835_wdt *wdt = watchdog_get_drvdata(wdog);
writel_relaxed(PM_PASSWORD | PM_RSTC_RESET, wdt->base + PM_RSTC);
dev_info(wdog->dev, "Watchdog timer stopped");
return 0;
}

55
drivers/watchdog/bcm47xx_wdt.c
View File

@ -20,7 +20,6 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/timer.h>
@ -88,12 +87,22 @@ static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
return 0;
}
static int bcm47xx_wdt_restart(struct watchdog_device *wdd)
{
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
wdt->timer_set(wdt, 1);
return 0;
}
static struct watchdog_ops bcm47xx_wdt_hard_ops = {
.owner = THIS_MODULE,
.start = bcm47xx_wdt_hard_start,
.stop = bcm47xx_wdt_hard_stop,
.ping = bcm47xx_wdt_hard_keepalive,
.set_timeout = bcm47xx_wdt_hard_set_timeout,
.restart = bcm47xx_wdt_restart,
};
static void bcm47xx_wdt_soft_timer_tick(unsigned long data)
@ -158,34 +167,13 @@ static const struct watchdog_info bcm47xx_wdt_info = {
WDIOF_MAGICCLOSE,
};
static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
unsigned long code, void *unused)
{
struct bcm47xx_wdt *wdt;
wdt = container_of(this, struct bcm47xx_wdt, notifier);
if (code == SYS_DOWN || code == SYS_HALT)
wdt->wdd.ops->stop(&wdt->wdd);
return NOTIFY_DONE;
}
static int bcm47xx_wdt_restart(struct notifier_block *this, unsigned long mode,
void *cmd)
{
struct bcm47xx_wdt *wdt;
wdt = container_of(this, struct bcm47xx_wdt, restart_handler);
wdt->timer_set(wdt, 1);
return NOTIFY_DONE;
}
static struct watchdog_ops bcm47xx_wdt_soft_ops = {
.owner = THIS_MODULE,
.start = bcm47xx_wdt_soft_start,
.stop = bcm47xx_wdt_soft_stop,
.ping = bcm47xx_wdt_soft_keepalive,
.set_timeout = bcm47xx_wdt_soft_set_timeout,
.restart = bcm47xx_wdt_restart,
};
static int bcm47xx_wdt_probe(struct platform_device *pdev)
@ -214,32 +202,18 @@ static int bcm47xx_wdt_probe(struct platform_device *pdev)
if (ret)
goto err_timer;
watchdog_set_nowayout(&wdt->wdd, nowayout);
wdt->notifier.notifier_call = &bcm47xx_wdt_notify_sys;
ret = register_reboot_notifier(&wdt->notifier);
if (ret)
goto err_timer;
wdt->restart_handler.notifier_call = &bcm47xx_wdt_restart;
wdt->restart_handler.priority = 64;
ret = register_restart_handler(&wdt->restart_handler);
if (ret)
goto err_notifier;
watchdog_set_restart_priority(&wdt->wdd, 64);
watchdog_stop_on_reboot(&wdt->wdd);
ret = watchdog_register_device(&wdt->wdd);
if (ret)
goto err_handler;
goto err_timer;
dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
timeout, nowayout ? ", nowayout" : "",
soft ? ", Software Timer" : "");
return 0;
err_handler:
unregister_restart_handler(&wdt->restart_handler);
err_notifier:
unregister_reboot_notifier(&wdt->notifier);
err_timer:
if (soft)
del_timer_sync(&wdt->soft_timer);
@ -255,7 +229,6 @@ static int bcm47xx_wdt_remove(struct platform_device *pdev)
return -ENXIO;
watchdog_unregister_device(&wdt->wdd);
unregister_reboot_notifier(&wdt->notifier);
return 0;
}

42
drivers/watchdog/cadence_wdt.c
View File

@ -18,7 +18,6 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/watchdog.h>
#define CDNS_WDT_DEFAULT_TIMEOUT 10
@ -72,7 +71,6 @@ MODULE_PARM_DESC(nowayout,
* @ctrl_clksel: counter clock prescaler selection
* @io_lock: spinlock for IO register access
* @cdns_wdt_device: watchdog device structure
* @cdns_wdt_notifier: notifier structure
*
* Structure containing parameters specific to cadence watchdog.
*/
@ -84,7 +82,6 @@ struct cdns_wdt {
u32 ctrl_clksel;
spinlock_t io_lock;
struct watchdog_device cdns_wdt_device;
struct notifier_block cdns_wdt_notifier;
};
/* Write access to Registers */
@ -280,29 +277,6 @@ static struct watchdog_ops cdns_wdt_ops = {
.set_timeout = cdns_wdt_settimeout,
};
/**
* cdns_wdt_notify_sys - Notifier for reboot or shutdown.
*
* @this: handle to notifier block
* @code: turn off indicator
* @unused: unused
* Return: NOTIFY_DONE
*
* This notifier is invoked whenever the system reboot or shutdown occur
* because we need to disable the WDT before system goes down as WDT might
* reset on the next boot.
*/
static int cdns_wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
struct cdns_wdt *wdt = container_of(this, struct cdns_wdt,
cdns_wdt_notifier);
if (code == SYS_DOWN || code == SYS_HALT)
cdns_wdt_stop(&wdt->cdns_wdt_device);
return NOTIFY_DONE;
}
/************************Platform Operations*****************************/
/**
* cdns_wdt_probe - Probe call for the device.
@ -360,6 +334,7 @@ static int cdns_wdt_probe(struct platform_device *pdev)
}
watchdog_set_nowayout(cdns_wdt_device, nowayout);
watchdog_stop_on_reboot(cdns_wdt_device);
watchdog_set_drvdata(cdns_wdt_device, wdt);
wdt->clk = devm_clk_get(&pdev->dev, NULL);
@ -386,14 +361,6 @@ static int cdns_wdt_probe(struct platform_device *pdev)
spin_lock_init(&wdt->io_lock);
wdt->cdns_wdt_notifier.notifier_call = &cdns_wdt_notify_sys;
ret = register_reboot_notifier(&wdt->cdns_wdt_notifier);
if (ret != 0) {
dev_err(&pdev->dev, "cannot register reboot notifier err=%d)\n",
ret);
goto err_clk_disable;
}
ret = watchdog_register_device(cdns_wdt_device);
if (ret) {
dev_err(&pdev->dev, "Failed to register wdt device\n");
@ -427,7 +394,6 @@ static int cdns_wdt_remove(struct platform_device *pdev)
cdns_wdt_stop(&wdt->cdns_wdt_device);
watchdog_unregister_device(&wdt->cdns_wdt_device);
unregister_reboot_notifier(&wdt->cdns_wdt_notifier);
clk_disable_unprepare(wdt->clk);
return 0;
@ -455,8 +421,7 @@ static void cdns_wdt_shutdown(struct platform_device *pdev)
*/
static int __maybe_unused cdns_wdt_suspend(struct device *dev)
{
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct platform_device *pdev = to_platform_device(dev);
struct cdns_wdt *wdt = platform_get_drvdata(pdev);
cdns_wdt_stop(&wdt->cdns_wdt_device);
@ -474,8 +439,7 @@ static int __maybe_unused cdns_wdt_suspend(struct device *dev)
static int __maybe_unused cdns_wdt_resume(struct device *dev)
{
int ret;
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct platform_device *pdev = to_platform_device(dev);
struct cdns_wdt *wdt = platform_get_drvdata(pdev);
ret = clk_prepare_enable(wdt->clk);

24
drivers/watchdog/da9052_wdt.c
View File

@ -31,7 +31,6 @@
struct da9052_wdt_data {
struct watchdog_device wdt;
struct da9052 *da9052;
struct kref kref;
unsigned long jpast;
};
@ -51,10 +50,6 @@ static const struct {
};
static void da9052_wdt_release_resources(struct kref *r)
{
}
static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
unsigned int timeout)
{
@ -104,20 +99,6 @@ static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
return 0;
}
static void da9052_wdt_ref(struct watchdog_device *wdt_dev)
{
struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_get(&driver_data->kref);
}
static void da9052_wdt_unref(struct watchdog_device *wdt_dev)
{
struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_put(&driver_data->kref, da9052_wdt_release_resources);
}
static int da9052_wdt_start(struct watchdog_device *wdt_dev)
{
return da9052_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
@ -170,8 +151,6 @@ static const struct watchdog_ops da9052_wdt_ops = {
.stop = da9052_wdt_stop,
.ping = da9052_wdt_ping,
.set_timeout = da9052_wdt_set_timeout,
.ref = da9052_wdt_ref,
.unref = da9052_wdt_unref,
};
@ -198,8 +177,6 @@ static int da9052_wdt_probe(struct platform_device *pdev)
da9052_wdt->parent = &pdev->dev;
watchdog_set_drvdata(da9052_wdt, driver_data);
kref_init(&driver_data->kref);
ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
DA9052_CONTROLD_TWDSCALE, 0);
if (ret < 0) {
@ -225,7 +202,6 @@ static int da9052_wdt_remove(struct platform_device *pdev)
struct da9052_wdt_data *driver_data = platform_get_drvdata(pdev);
watchdog_unregister_device(&driver_data->wdt);
kref_put(&driver_data->kref, da9052_wdt_release_resources);
return 0;
}

24
drivers/watchdog/da9055_wdt.c
View File

@ -35,7 +35,6 @@ MODULE_PARM_DESC(nowayout,
struct da9055_wdt_data {
struct watchdog_device wdt;
struct da9055 *da9055;
struct kref kref;
};
static const struct {
@ -99,24 +98,6 @@ static int da9055_wdt_ping(struct watchdog_device *wdt_dev)
DA9055_WATCHDOG_MASK, 1);
}
static void da9055_wdt_release_resources(struct kref *r)
{
}
static void da9055_wdt_ref(struct watchdog_device *wdt_dev)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_get(&driver_data->kref);
}
static void da9055_wdt_unref(struct watchdog_device *wdt_dev)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_put(&driver_data->kref, da9055_wdt_release_resources);
}
static int da9055_wdt_start(struct watchdog_device *wdt_dev)
{
return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
@ -138,8 +119,6 @@ static const struct watchdog_ops da9055_wdt_ops = {
.stop = da9055_wdt_stop,
.ping = da9055_wdt_ping,
.set_timeout = da9055_wdt_set_timeout,
.ref = da9055_wdt_ref,
.unref = da9055_wdt_unref,
};
static int da9055_wdt_probe(struct platform_device *pdev)
@ -165,8 +144,6 @@ static int da9055_wdt_probe(struct platform_device *pdev)
watchdog_set_nowayout(da9055_wdt, nowayout);
watchdog_set_drvdata(da9055_wdt, driver_data);
kref_init(&driver_data->kref);
ret = da9055_wdt_stop(da9055_wdt);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to stop watchdog, %d\n", ret);
@ -189,7 +166,6 @@ static int da9055_wdt_remove(struct platform_device *pdev)
struct da9055_wdt_data *driver_data = platform_get_drvdata(pdev);
watchdog_unregister_device(&driver_data->wdt);
kref_put(&driver_data->kref, da9055_wdt_release_resources);
return 0;
}

23
drivers/watchdog/da9063_wdt.c
View File

@ -20,7 +20,6 @@
#include <linux/delay.h>
#include <linux/mfd/da9063/registers.h>
#include <linux/mfd/da9063/core.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
/*
@ -39,7 +38,6 @@ static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
struct da9063_watchdog {
struct da9063 *da9063;
struct watchdog_device wdtdev;
struct notifier_block restart_handler;
};
static unsigned int da9063_wdt_timeout_to_sel(unsigned int secs)
@ -121,12 +119,9 @@ static int da9063_wdt_set_timeout(struct watchdog_device *wdd,
return ret;
}
static int da9063_wdt_restart_handler(struct notifier_block *this,
unsigned long mode, void *cmd)
static int da9063_wdt_restart(struct watchdog_device *wdd)
{
struct da9063_watchdog *wdt = container_of(this,
struct da9063_watchdog,
restart_handler);
struct da9063_watchdog *wdt = watchdog_get_drvdata(wdd);
int ret;
ret = regmap_write(wdt->da9063->regmap, DA9063_REG_CONTROL_F,
@ -135,7 +130,7 @@ static int da9063_wdt_restart_handler(struct notifier_block *this,
dev_alert(wdt->da9063->dev, "Failed to shutdown (err = %d)\n",
ret);
return NOTIFY_DONE;
return ret;
}
static const struct watchdog_info da9063_watchdog_info = {
@ -149,6 +144,7 @@ static const struct watchdog_ops da9063_watchdog_ops = {
.stop = da9063_wdt_stop,
.ping = da9063_wdt_ping,
.set_timeout = da9063_wdt_set_timeout,
.restart = da9063_wdt_restart,
};
static int da9063_wdt_probe(struct platform_device *pdev)
@ -179,6 +175,8 @@ static int da9063_wdt_probe(struct platform_device *pdev)
wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
watchdog_set_restart_priority(&wdt->wdtdev, 128);
watchdog_set_drvdata(&wdt->wdtdev, wdt);
dev_set_drvdata(&pdev->dev, wdt);
@ -186,13 +184,6 @@ static int da9063_wdt_probe(struct platform_device *pdev)
if (ret)
return ret;
wdt->restart_handler.notifier_call = da9063_wdt_restart_handler;
wdt->restart_handler.priority = 128;
ret = register_restart_handler(&wdt->restart_handler);
if (ret)
dev_err(wdt->da9063->dev,
"Failed to register restart handler (err = %d)\n", ret);
return 0;
}
@ -200,8 +191,6 @@ static int da9063_wdt_remove(struct platform_device *pdev)
{
struct da9063_watchdog *wdt = dev_get_drvdata(&pdev->dev);
unregister_restart_handler(&wdt->restart_handler);
watchdog_unregister_device(&wdt->wdtdev);
return 0;

26
drivers/watchdog/diag288_wdt.c
View File

@ -106,6 +106,10 @@ static int __diag288_lpar(unsigned int func, unsigned int timeout,
return __diag288(func, timeout, action, 0);
}
static unsigned long wdt_status;
#define DIAG_WDOG_BUSY 0
static int wdt_start(struct watchdog_device *dev)
{
char *ebc_cmd;
@ -113,12 +117,17 @@ static int wdt_start(struct watchdog_device *dev)
int ret;
unsigned int func;
if (test_and_set_bit(DIAG_WDOG_BUSY, &wdt_status))
return -EBUSY;
ret = -ENODEV;
if (MACHINE_IS_VM) {
ebc_cmd = kmalloc(MAX_CMDLEN, GFP_KERNEL);
if (!ebc_cmd)
if (!ebc_cmd) {
clear_bit(DIAG_WDOG_BUSY, &wdt_status);
return -ENOMEM;
}
len = strlcpy(ebc_cmd, wdt_cmd, MAX_CMDLEN);
ASCEBC(ebc_cmd, MAX_CMDLEN);
EBC_TOUPPER(ebc_cmd, MAX_CMDLEN);
@ -135,6 +144,7 @@ static int wdt_start(struct watchdog_device *dev)
if (ret) {
pr_err("The watchdog cannot be activated\n");
clear_bit(DIAG_WDOG_BUSY, &wdt_status);
return ret;
}
return 0;
@ -146,6 +156,9 @@ static int wdt_stop(struct watchdog_device *dev)
diag_stat_inc(DIAG_STAT_X288);
ret = __diag288(WDT_FUNC_CANCEL, 0, 0, 0);
clear_bit(DIAG_WDOG_BUSY, &wdt_status);
return ret;
}
@ -220,17 +233,10 @@ static struct watchdog_device wdt_dev = {
* It makes no sense to go into suspend while the watchdog is running.
* Depending on the memory size, the watchdog might trigger, while we
* are still saving the memory.
* We reuse the open flag to ensure that suspend and watchdog open are
* exclusive operations
*/
static int wdt_suspend(void)
{
if (test_and_set_bit(WDOG_DEV_OPEN, &wdt_dev.status)) {
pr_err("Linux cannot be suspended while the watchdog is in use\n");
return notifier_from_errno(-EBUSY);
}
if (test_bit(WDOG_ACTIVE, &wdt_dev.status)) {
clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
if (test_and_set_bit(DIAG_WDOG_BUSY, &wdt_status)) {
pr_err("Linux cannot be suspended while the watchdog is in use\n");
return notifier_from_errno(-EBUSY);
}
@ -239,7 +245,7 @@ static int wdt_suspend(void)
static int wdt_resume(void)
{
clear_bit(WDOG_DEV_OPEN, &wdt_dev.status);
clear_bit(DIAG_WDOG_BUSY, &wdt_status);
return NOTIFY_DONE;
}

18
drivers/watchdog/digicolor_wdt.c
View File

@ -15,7 +15,6 @@
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/watchdog.h>
#include <linux/reboot.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
@ -28,7 +27,6 @@
struct dc_wdt {
void __iomem *base;
struct clk *clk;
struct notifier_block restart_handler;
spinlock_t lock;
};
@ -50,16 +48,15 @@ static void dc_wdt_set(struct dc_wdt *wdt, u32 ticks)
spin_unlock_irqrestore(&wdt->lock, flags);
}
static int dc_restart_handler(struct notifier_block *this, unsigned long mode,
void *cmd)
static int dc_wdt_restart(struct watchdog_device *wdog)
{
struct dc_wdt *wdt = container_of(this, struct dc_wdt, restart_handler);
struct dc_wdt *wdt = watchdog_get_drvdata(wdog);
dc_wdt_set(wdt, 1);
/* wait for reset to assert... */
mdelay(500);
return NOTIFY_DONE;
return 0;
}
static int dc_wdt_start(struct watchdog_device *wdog)
@ -104,6 +101,7 @@ static struct watchdog_ops dc_wdt_ops = {
.stop = dc_wdt_stop,
.set_timeout = dc_wdt_set_timeout,
.get_timeleft = dc_wdt_get_timeleft,
.restart = dc_wdt_restart,
};
static struct watchdog_info dc_wdt_info = {
@ -148,6 +146,7 @@ static int dc_wdt_probe(struct platform_device *pdev)
spin_lock_init(&wdt->lock);
watchdog_set_drvdata(&dc_wdt_wdd, wdt);
watchdog_set_restart_priority(&dc_wdt_wdd, 128);
watchdog_init_timeout(&dc_wdt_wdd, timeout, dev);
ret = watchdog_register_device(&dc_wdt_wdd);
if (ret) {
@ -155,12 +154,6 @@ static int dc_wdt_probe(struct platform_device *pdev)
goto err_iounmap;
}
wdt->restart_handler.notifier_call = dc_restart_handler;
wdt->restart_handler.priority = 128;
ret = register_restart_handler(&wdt->restart_handler);
if (ret)
dev_warn(&pdev->dev, "cannot register restart handler\n");
return 0;
err_iounmap:
@ -172,7 +165,6 @@ static int dc_wdt_remove(struct platform_device *pdev)
{
struct dc_wdt *wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&wdt->restart_handler);
watchdog_unregister_device(&dc_wdt_wdd);
iounmap(wdt->base);

2
drivers/watchdog/dw_wdt.c
View File

@ -81,7 +81,7 @@ static inline int dw_wdt_top_in_seconds(unsigned top)
* There are 16 possible timeout values in 0..15 where the number of
* cycles is 2 ^ (16 + i) and the watchdog counts down.
*/
return (1 << (16 + top)) / clk_get_rate(dw_wdt.clk);
return (1U << (16 + top)) / clk_get_rate(dw_wdt.clk);
}
static int dw_wdt_get_top(void)

38
drivers/watchdog/gpio_wdt.c
View File

@ -12,10 +12,8 @@
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/watchdog.h>
#define SOFT_TIMEOUT_MIN 1
@ -36,7 +34,6 @@ struct gpio_wdt_priv {
unsigned int hw_algo;
unsigned int hw_margin;
unsigned long last_jiffies;
struct notifier_block notifier;
struct timer_list timer;
struct watchdog_device wdd;
};
@ -57,7 +54,8 @@ static void gpio_wdt_hwping(unsigned long data)
if (priv->armed && time_after(jiffies, priv->last_jiffies +
msecs_to_jiffies(wdd->timeout * 1000))) {
dev_crit(wdd->dev, "Timer expired. System will reboot soon!\n");
dev_crit(wdd->parent,
"Timer expired. System will reboot soon!\n");
return;
}
@ -126,26 +124,6 @@ static int gpio_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
return gpio_wdt_ping(wdd);
}
static int gpio_wdt_notify_sys(struct notifier_block *nb, unsigned long code,
void *unused)
{
struct gpio_wdt_priv *priv = container_of(nb, struct gpio_wdt_priv,
notifier);
mod_timer(&priv->timer, 0);
switch (code) {
case SYS_HALT:
case SYS_POWER_OFF:
gpio_wdt_disable(priv);
break;
default:
break;
}
return NOTIFY_DONE;
}
static const struct watchdog_info gpio_wdt_ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT,
@ -224,23 +202,16 @@ static int gpio_wdt_probe(struct platform_device *pdev)
setup_timer(&priv->timer, gpio_wdt_hwping, (unsigned long)&priv->wdd);
watchdog_stop_on_reboot(&priv->wdd);
ret = watchdog_register_device(&priv->wdd);
if (ret)
return ret;
priv->notifier.notifier_call = gpio_wdt_notify_sys;
ret = register_reboot_notifier(&priv->notifier);
if (ret)
goto error_unregister;
if (priv->always_running)
gpio_wdt_start_impl(priv);
return 0;
error_unregister:
watchdog_unregister_device(&priv->wdd);
return ret;
}
static int gpio_wdt_remove(struct platform_device *pdev)
@ -248,7 +219,6 @@ static int gpio_wdt_remove(struct platform_device *pdev)
struct gpio_wdt_priv *priv = platform_get_drvdata(pdev);
del_timer_sync(&priv->timer);
unregister_reboot_notifier(&priv->notifier);
watchdog_unregister_device(&priv->wdd);
return 0;

12
drivers/watchdog/hpwdt.c
View File

@ -1,11 +1,11 @@
/*
* HP WatchDog Driver
* HPE WatchDog Driver
* based on
*
* SoftDog 0.05: A Software Watchdog Device
*
* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
* Thomas Mingarelli <thomas.mingarelli@hp.com>
* (c) Copyright 2015 Hewlett Packard Enterprise Development LP
* Thomas Mingarelli <thomas.mingarelli@hpe.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@ -580,7 +580,7 @@ static const struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.identity = "HP iLO2+ HW Watchdog Timer",
.identity = "HPE iLO2+ HW Watchdog Timer",
};
static long hpwdt_ioctl(struct file *file, unsigned int cmd,
@ -758,7 +758,7 @@ static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
goto error2;
dev_info(&dev->dev,
"HP Watchdog Timer Driver: NMI decoding initialized"
"HPE Watchdog Timer Driver: NMI decoding initialized"
", allow kernel dump: %s (default = 1/ON)\n",
(allow_kdump == 0) ? "OFF" : "ON");
return 0;
@ -863,7 +863,7 @@ static int hpwdt_init_one(struct pci_dev *dev,
goto error_misc_register;
}
dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
dev_info(&dev->dev, "HPE Watchdog Timer Driver: %s"
", timer margin: %d seconds (nowayout=%d).\n",
HPWDT_VERSION, soft_margin, nowayout);
return 0;

34
drivers/watchdog/imgpdc_wdt.c
View File

@ -45,7 +45,6 @@
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/watchdog.h>
@ -87,7 +86,6 @@ struct pdc_wdt_dev {
struct clk *wdt_clk;
struct clk *sys_clk;
void __iomem *base;
struct notifier_block restart_handler;
};
static int pdc_wdt_keepalive(struct watchdog_device *wdt_dev)
@ -152,6 +150,16 @@ static int pdc_wdt_start(struct watchdog_device *wdt_dev)
return 0;
}
static int pdc_wdt_restart(struct watchdog_device *wdt_dev)
{
struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);
/* Assert SOFT_RESET */
writel(0x1, wdt->base + PDC_WDT_SOFT_RESET);
return 0;
}
static struct watchdog_info pdc_wdt_info = {
.identity = "IMG PDC Watchdog",
.options = WDIOF_SETTIMEOUT |
@ -165,20 +173,9 @@ static const struct watchdog_ops pdc_wdt_ops = {
.stop = pdc_wdt_stop,
.ping = pdc_wdt_keepalive,
.set_timeout = pdc_wdt_set_timeout,
.restart = pdc_wdt_restart,
};
static int pdc_wdt_restart(struct notifier_block *this, unsigned long mode,
void *cmd)
{
struct pdc_wdt_dev *wdt = container_of(this, struct pdc_wdt_dev,
restart_handler);
/* Assert SOFT_RESET */
writel(0x1, wdt->base + PDC_WDT_SOFT_RESET);
return NOTIFY_OK;
}
static int pdc_wdt_probe(struct platform_device *pdev)
{
u64 div;
@ -282,6 +279,7 @@ static int pdc_wdt_probe(struct platform_device *pdev)
}
watchdog_set_nowayout(&pdc_wdt->wdt_dev, nowayout);
watchdog_set_restart_priority(&pdc_wdt->wdt_dev, 128);
platform_set_drvdata(pdev, pdc_wdt);
@ -289,13 +287,6 @@ static int pdc_wdt_probe(struct platform_device *pdev)
if (ret)
goto disable_wdt_clk;
pdc_wdt->restart_handler.notifier_call = pdc_wdt_restart;
pdc_wdt->restart_handler.priority = 128;
ret = register_restart_handler(&pdc_wdt->restart_handler);
if (ret)
dev_warn(&pdev->dev, "failed to register restart handler: %d\n",
ret);
return 0;
disable_wdt_clk:
@ -316,7 +307,6 @@ static int pdc_wdt_remove(struct platform_device *pdev)
{
struct pdc_wdt_dev *pdc_wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&pdc_wdt->restart_handler);
pdc_wdt_stop(&pdc_wdt->wdt_dev);
watchdog_unregister_device(&pdc_wdt->wdt_dev);
clk_disable_unprepare(pdc_wdt->wdt_clk);

23
drivers/watchdog/imx2_wdt.c
View File

@ -29,10 +29,8 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/notifier.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <linux/timer.h>
#include <linux/watchdog.h>
@ -64,7 +62,6 @@ struct imx2_wdt_device {
struct regmap *regmap;
struct timer_list timer; /* Pings the watchdog when closed */
struct watchdog_device wdog;
struct notifier_block restart_handler;
};
static bool nowayout = WATCHDOG_NOWAYOUT;
@ -83,13 +80,11 @@ static const struct watchdog_info imx2_wdt_info = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
};
static int imx2_restart_handler(struct notifier_block *this, unsigned long mode,
void *cmd)
static int imx2_wdt_restart(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
unsigned int wcr_enable = IMX2_WDT_WCR_WDE;
struct imx2_wdt_device *wdev = container_of(this,
struct imx2_wdt_device,
restart_handler);
/* Assert SRS signal */
regmap_write(wdev->regmap, IMX2_WDT_WCR, wcr_enable);
/*
@ -105,7 +100,7 @@ static int imx2_restart_handler(struct notifier_block *this, unsigned long mode,
/* wait for reset to assert... */
mdelay(500);
return NOTIFY_DONE;
return 0;
}
static inline void imx2_wdt_setup(struct watchdog_device *wdog)
@ -213,6 +208,7 @@ static const struct watchdog_ops imx2_wdt_ops = {
.stop = imx2_wdt_stop,
.ping = imx2_wdt_ping,
.set_timeout = imx2_wdt_set_timeout,
.restart = imx2_wdt_restart,
};
static const struct regmap_config imx2_wdt_regmap_config = {
@ -275,6 +271,7 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, wdog);
watchdog_set_drvdata(wdog, wdev);
watchdog_set_nowayout(wdog, nowayout);
watchdog_set_restart_priority(wdog, 128);
watchdog_init_timeout(wdog, timeout, &pdev->dev);
setup_timer(&wdev->timer, imx2_wdt_timer_ping, (unsigned long)wdog);
@ -294,12 +291,6 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
goto disable_clk;
}
wdev->restart_handler.notifier_call = imx2_restart_handler;
wdev->restart_handler.priority = 128;
ret = register_restart_handler(&wdev->restart_handler);
if (ret)
dev_err(&pdev->dev, "cannot register restart handler\n");
dev_info(&pdev->dev, "timeout %d sec (nowayout=%d)\n",
wdog->timeout, nowayout);
@ -315,8 +306,6 @@ static int __exit imx2_wdt_remove(struct platform_device *pdev)
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
unregister_restart_handler(&wdev->restart_handler);
watchdog_unregister_device(wdog);
if (imx2_wdt_is_running(wdev)) {

52
drivers/watchdog/lpc18xx_wdt.c
View File

@ -18,7 +18,6 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/watchdog.h>
/* Registers */
@ -59,7 +58,6 @@ struct lpc18xx_wdt_dev {
unsigned long clk_rate;
void __iomem *base;
struct timer_list timer;
struct notifier_block restart_handler;
spinlock_t lock;
};
@ -155,27 +153,9 @@ static int lpc18xx_wdt_start(struct watchdog_device *wdt_dev)
return 0;
}
static struct watchdog_info lpc18xx_wdt_info = {
.identity = "NXP LPC18xx Watchdog",
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
};
static const struct watchdog_ops lpc18xx_wdt_ops = {
.owner = THIS_MODULE,
.start = lpc18xx_wdt_start,
.stop = lpc18xx_wdt_stop,
.ping = lpc18xx_wdt_feed,
.set_timeout = lpc18xx_wdt_set_timeout,
.get_timeleft = lpc18xx_wdt_get_timeleft,
};
static int lpc18xx_wdt_restart(struct notifier_block *this, unsigned long mode,
void *cmd)
static int lpc18xx_wdt_restart(struct watchdog_device *wdt_dev)
{
struct lpc18xx_wdt_dev *lpc18xx_wdt = container_of(this,
struct lpc18xx_wdt_dev, restart_handler);
struct lpc18xx_wdt_dev *lpc18xx_wdt = watchdog_get_drvdata(wdt_dev);
unsigned long flags;
int val;
@ -197,9 +177,26 @@ static int lpc18xx_wdt_restart(struct notifier_block *this, unsigned long mode,
spin_unlock_irqrestore(&lpc18xx_wdt->lock, flags);
return NOTIFY_OK;
return 0;
}
static struct watchdog_info lpc18xx_wdt_info = {
.identity = "NXP LPC18xx Watchdog",
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
};
static const struct watchdog_ops lpc18xx_wdt_ops = {
.owner = THIS_MODULE,
.start = lpc18xx_wdt_start,
.stop = lpc18xx_wdt_stop,
.ping = lpc18xx_wdt_feed,
.set_timeout = lpc18xx_wdt_set_timeout,
.get_timeleft = lpc18xx_wdt_get_timeleft,
.restart = lpc18xx_wdt_restart,
};
static int lpc18xx_wdt_probe(struct platform_device *pdev)
{
struct lpc18xx_wdt_dev *lpc18xx_wdt;
@ -273,6 +270,7 @@ static int lpc18xx_wdt_probe(struct platform_device *pdev)
(unsigned long)&lpc18xx_wdt->wdt_dev);
watchdog_set_nowayout(&lpc18xx_wdt->wdt_dev, nowayout);
watchdog_set_restart_priority(&lpc18xx_wdt->wdt_dev, 128);
platform_set_drvdata(pdev, lpc18xx_wdt);
@ -280,12 +278,6 @@ static int lpc18xx_wdt_probe(struct platform_device *pdev)
if (ret)
goto disable_wdt_clk;
lpc18xx_wdt->restart_handler.notifier_call = lpc18xx_wdt_restart;
lpc18xx_wdt->restart_handler.priority = 128;
ret = register_restart_handler(&lpc18xx_wdt->restart_handler);
if (ret)
dev_warn(dev, "failed to register restart handler: %d\n", ret);
return 0;
disable_wdt_clk:
@ -306,8 +298,6 @@ static int lpc18xx_wdt_remove(struct platform_device *pdev)
{
struct lpc18xx_wdt_dev *lpc18xx_wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&lpc18xx_wdt->restart_handler);
dev_warn(&pdev->dev, "I quit now, hardware will probably reboot!\n");
del_timer(&lpc18xx_wdt->timer);

4
drivers/watchdog/mena21_wdt.c
View File

@ -100,12 +100,12 @@ static int a21_wdt_set_timeout(struct watchdog_device *wdt,
struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);
if (timeout != 1 && timeout != 30) {
dev_err(wdt->dev, "Only 1 and 30 allowed as timeout\n");
dev_err(wdt->parent, "Only 1 and 30 allowed as timeout\n");
return -EINVAL;
}
if (timeout == 30 && wdt->timeout == 1) {
dev_err(wdt->dev,
dev_err(wdt->parent,
"Transition from fast to slow mode not allowed\n");
return -EINVAL;
}

88
drivers/watchdog/meson_wdt.c
View File

@ -17,51 +17,64 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#define DRV_NAME "meson_wdt"
#define MESON_WDT_TC 0x00
#define MESON_WDT_TC_EN BIT(22)
#define MESON_WDT_TC_TM_MASK 0x3fffff
#define MESON_WDT_DC_RESET (3 << 24)
#define MESON_WDT_RESET 0x04
#define MESON_WDT_TIMEOUT 30
#define MESON_WDT_MIN_TIMEOUT 1
#define MESON_WDT_MAX_TIMEOUT (MESON_WDT_TC_TM_MASK / 100000)
#define MESON_SEC_TO_TC(s) ((s) * 100000)
#define MESON_SEC_TO_TC(s, c) ((s) * (c))
static bool nowayout = WATCHDOG_NOWAYOUT;
static unsigned int timeout = MESON_WDT_TIMEOUT;
struct meson_wdt_data {
unsigned int enable;
unsigned int terminal_count_mask;
unsigned int count_unit;
};
static struct meson_wdt_data meson6_wdt_data = {
.enable = BIT(22),
.terminal_count_mask = 0x3fffff,
.count_unit = 100000, /* 10 us */
};
static struct meson_wdt_data meson8b_wdt_data = {
.enable = BIT(19),
.terminal_count_mask = 0xffff,
.count_unit = 7812, /* 128 us */
};
struct meson_wdt_dev {
struct watchdog_device wdt_dev;
void __iomem *wdt_base;
struct notifier_block restart_handler;
const struct meson_wdt_data *data;
};
static int meson_restart_handle(struct notifier_block *this, unsigned long mode,
void *cmd)
static int meson_wdt_restart(struct watchdog_device *wdt_dev)
{
u32 tc_reboot = MESON_WDT_DC_RESET | MESON_WDT_TC_EN;
struct meson_wdt_dev *meson_wdt = container_of(this,
struct meson_wdt_dev,
restart_handler);
struct meson_wdt_dev *meson_wdt = watchdog_get_drvdata(wdt_dev);
u32 tc_reboot = MESON_WDT_DC_RESET;
tc_reboot |= meson_wdt->data->enable;
while (1) {
writel(tc_reboot, meson_wdt->wdt_base + MESON_WDT_TC);
mdelay(5);
}
return NOTIFY_DONE;
return 0;
}
static int meson_wdt_ping(struct watchdog_device *wdt_dev)
@ -80,8 +93,8 @@ static void meson_wdt_change_timeout(struct watchdog_device *wdt_dev,
u32 reg;
reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
reg &= ~MESON_WDT_TC_TM_MASK;
reg |= MESON_SEC_TO_TC(timeout);
reg &= ~meson_wdt->data->terminal_count_mask;
reg |= MESON_SEC_TO_TC(timeout, meson_wdt->data->count_unit);
writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
}
@ -102,7 +115,7 @@ static int meson_wdt_stop(struct watchdog_device *wdt_dev)
u32 reg;
reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
reg &= ~MESON_WDT_TC_EN;
reg &= ~meson_wdt->data->enable;
writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
return 0;
@ -117,7 +130,7 @@ static int meson_wdt_start(struct watchdog_device *wdt_dev)
meson_wdt_ping(wdt_dev);
reg = readl(meson_wdt->wdt_base + MESON_WDT_TC);
reg |= MESON_WDT_TC_EN;
reg |= meson_wdt->data->enable;
writel(reg, meson_wdt->wdt_base + MESON_WDT_TC);
return 0;
@ -136,12 +149,21 @@ static const struct watchdog_ops meson_wdt_ops = {
.stop = meson_wdt_stop,
.ping = meson_wdt_ping,
.set_timeout = meson_wdt_set_timeout,
.restart = meson_wdt_restart,
};
static const struct of_device_id meson_wdt_dt_ids[] = {
{ .compatible = "amlogic,meson6-wdt", .data = &meson6_wdt_data },
{ .compatible = "amlogic,meson8b-wdt", .data = &meson8b_wdt_data },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, meson_wdt_dt_ids);
static int meson_wdt_probe(struct platform_device *pdev)
{
struct resource *res;
struct meson_wdt_dev *meson_wdt;
const struct of_device_id *of_id;
int err;
meson_wdt = devm_kzalloc(&pdev->dev, sizeof(*meson_wdt), GFP_KERNEL);
@ -153,17 +175,28 @@ static int meson_wdt_probe(struct platform_device *pdev)
if (IS_ERR(meson_wdt->wdt_base))
return PTR_ERR(meson_wdt->wdt_base);
of_id = of_match_device(meson_wdt_dt_ids, &pdev->dev);
if (!of_id) {
dev_err(&pdev->dev, "Unable to initialize WDT data\n");
return -ENODEV;
}
meson_wdt->data = of_id->data;
meson_wdt->wdt_dev.parent = &pdev->dev;
meson_wdt->wdt_dev.info = &meson_wdt_info;
meson_wdt->wdt_dev.ops = &meson_wdt_ops;
meson_wdt->wdt_dev.timeout = MESON_WDT_TIMEOUT;
meson_wdt->wdt_dev.max_timeout = MESON_WDT_MAX_TIMEOUT;
meson_wdt->wdt_dev.max_timeout =
meson_wdt->data->terminal_count_mask / meson_wdt->data->count_unit;
meson_wdt->wdt_dev.min_timeout = MESON_WDT_MIN_TIMEOUT;
meson_wdt->wdt_dev.timeout = min_t(unsigned int,
MESON_WDT_TIMEOUT,
meson_wdt->wdt_dev.max_timeout);
watchdog_set_drvdata(&meson_wdt->wdt_dev, meson_wdt);
watchdog_init_timeout(&meson_wdt->wdt_dev, timeout, &pdev->dev);
watchdog_set_nowayout(&meson_wdt->wdt_dev, nowayout);
watchdog_set_restart_priority(&meson_wdt->wdt_dev, 128);
meson_wdt_stop(&meson_wdt->wdt_dev);
@ -173,13 +206,6 @@ static int meson_wdt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, meson_wdt);
meson_wdt->restart_handler.notifier_call = meson_restart_handle;
meson_wdt->restart_handler.priority = 128;
err = register_restart_handler(&meson_wdt->restart_handler);
if (err)
dev_err(&pdev->dev,
"cannot register restart handler (err=%d)\n", err);
dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)",
meson_wdt->wdt_dev.timeout, nowayout);
@ -190,8 +216,6 @@ static int meson_wdt_remove(struct platform_device *pdev)
{
struct meson_wdt_dev *meson_wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&meson_wdt->restart_handler);
watchdog_unregister_device(&meson_wdt->wdt_dev);
return 0;
@ -204,12 +228,6 @@ static void meson_wdt_shutdown(struct platform_device *pdev)
meson_wdt_stop(&meson_wdt->wdt_dev);
}
static const struct of_device_id meson_wdt_dt_ids[] = {
{ .compatible = "amlogic,meson6-wdt" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, meson_wdt_dt_ids);
static struct platform_driver meson_wdt_driver = {
.probe = meson_wdt_probe,
.remove = meson_wdt_remove,

23
drivers/watchdog/moxart_wdt.c
View File

@ -15,9 +15,7 @@
#include <linux/module.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/watchdog.h>
#include <linux/moduleparam.h>
@ -29,22 +27,19 @@ struct moxart_wdt_dev {
struct watchdog_device dev;
void __iomem *base;
unsigned int clock_frequency;
struct notifier_block restart_handler;
};
static int heartbeat;
static int moxart_restart_handle(struct notifier_block *this,
unsigned long mode, void *cmd)
static int moxart_wdt_restart(struct watchdog_device *wdt_dev)
{
struct moxart_wdt_dev *moxart_wdt = container_of(this,
struct moxart_wdt_dev,
restart_handler);
struct moxart_wdt_dev *moxart_wdt = watchdog_get_drvdata(wdt_dev);
writel(1, moxart_wdt->base + REG_COUNT);
writel(0x5ab9, moxart_wdt->base + REG_MODE);
writel(0x03, moxart_wdt->base + REG_ENABLE);
return NOTIFY_DONE;
return 0;
}
static int moxart_wdt_stop(struct watchdog_device *wdt_dev)
@ -87,6 +82,7 @@ static const struct watchdog_ops moxart_wdt_ops = {
.start = moxart_wdt_start,
.stop = moxart_wdt_stop,
.set_timeout = moxart_wdt_set_timeout,
.restart = moxart_wdt_restart,
};
static int moxart_wdt_probe(struct platform_device *pdev)
@ -134,6 +130,7 @@ static int moxart_wdt_probe(struct platform_device *pdev)
watchdog_init_timeout(&moxart_wdt->dev, heartbeat, dev);
watchdog_set_nowayout(&moxart_wdt->dev, nowayout);
watchdog_set_restart_priority(&moxart_wdt->dev, 128);
watchdog_set_drvdata(&moxart_wdt->dev, moxart_wdt);
@ -141,13 +138,6 @@ static int moxart_wdt_probe(struct platform_device *pdev)
if (err)
return err;
moxart_wdt->restart_handler.notifier_call = moxart_restart_handle;
moxart_wdt->restart_handler.priority = 128;
err = register_restart_handler(&moxart_wdt->restart_handler);
if (err)
dev_err(dev, "cannot register restart notifier (err=%d)\n",
err);
dev_dbg(dev, "Watchdog enabled (heartbeat=%d sec, nowayout=%d)\n",
moxart_wdt->dev.timeout, nowayout);
@ -158,7 +148,6 @@ static int moxart_wdt_remove(struct platform_device *pdev)
{
struct moxart_wdt_dev *moxart_wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&moxart_wdt->restart_handler);
moxart_wdt_stop(&moxart_wdt->dev);
return 0;

186
drivers/watchdog/mt7621_wdt.c Normal file
View File

@ -0,0 +1,186 @@
/*
* Ralink MT7621/MT7628 built-in hardware watchdog timer
*
* Copyright (C) 2014 John Crispin <blogic@openwrt.org>
*
* This driver was based on: drivers/watchdog/rt2880_wdt.c
*
* 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.
*/
#include <linux/clk.h>
#include <linux/reset.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/watchdog.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <asm/mach-ralink/ralink_regs.h>
#define SYSC_RSTSTAT 0x38
#define WDT_RST_CAUSE BIT(1)
#define RALINK_WDT_TIMEOUT 30
#define TIMER_REG_TMRSTAT 0x00
#define TIMER_REG_TMR1LOAD 0x24
#define TIMER_REG_TMR1CTL 0x20
#define TMR1CTL_ENABLE BIT(7)
#define TMR1CTL_RESTART BIT(9)
#define TMR1CTL_PRESCALE_SHIFT 16
static void __iomem *mt7621_wdt_base;
static struct reset_control *mt7621_wdt_reset;
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 inline void rt_wdt_w32(unsigned reg, u32 val)
{
iowrite32(val, mt7621_wdt_base + reg);
}
static inline u32 rt_wdt_r32(unsigned reg)
{
return ioread32(mt7621_wdt_base + reg);
}
static int mt7621_wdt_ping(struct watchdog_device *w)
{
rt_wdt_w32(TIMER_REG_TMRSTAT, TMR1CTL_RESTART);
return 0;
}
static int mt7621_wdt_set_timeout(struct watchdog_device *w, unsigned int t)
{
w->timeout = t;
rt_wdt_w32(TIMER_REG_TMR1LOAD, t * 1000);
mt7621_wdt_ping(w);
return 0;
}
static int mt7621_wdt_start(struct watchdog_device *w)
{
u32 t;
/* set the prescaler to 1ms == 1000us */
rt_wdt_w32(TIMER_REG_TMR1CTL, 1000 << TMR1CTL_PRESCALE_SHIFT);
mt7621_wdt_set_timeout(w, w->timeout);
t = rt_wdt_r32(TIMER_REG_TMR1CTL);
t |= TMR1CTL_ENABLE;
rt_wdt_w32(TIMER_REG_TMR1CTL, t);
return 0;
}
static int mt7621_wdt_stop(struct watchdog_device *w)
{
u32 t;
mt7621_wdt_ping(w);
t = rt_wdt_r32(TIMER_REG_TMR1CTL);
t &= ~TMR1CTL_ENABLE;
rt_wdt_w32(TIMER_REG_TMR1CTL, t);
return 0;
}
static int mt7621_wdt_bootcause(void)
{
if (rt_sysc_r32(SYSC_RSTSTAT) & WDT_RST_CAUSE)
return WDIOF_CARDRESET;
return 0;
}
static struct watchdog_info mt7621_wdt_info = {
.identity = "Mediatek Watchdog",
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
};
static struct watchdog_ops mt7621_wdt_ops = {
.owner = THIS_MODULE,
.start = mt7621_wdt_start,
.stop = mt7621_wdt_stop,
.ping = mt7621_wdt_ping,
.set_timeout = mt7621_wdt_set_timeout,
};
static struct watchdog_device mt7621_wdt_dev = {
.info = &mt7621_wdt_info,
.ops = &mt7621_wdt_ops,
.min_timeout = 1,
.max_timeout = 0xfffful / 1000,
};
static int mt7621_wdt_probe(struct platform_device *pdev)
{
struct resource *res;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mt7621_wdt_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mt7621_wdt_base))
return PTR_ERR(mt7621_wdt_base);
mt7621_wdt_reset = devm_reset_control_get(&pdev->dev, NULL);
if (!IS_ERR(mt7621_wdt_reset))
reset_control_deassert(mt7621_wdt_reset);
mt7621_wdt_dev.dev = &pdev->dev;
mt7621_wdt_dev.bootstatus = mt7621_wdt_bootcause();
watchdog_init_timeout(&mt7621_wdt_dev, mt7621_wdt_dev.max_timeout,
&pdev->dev);
watchdog_set_nowayout(&mt7621_wdt_dev, nowayout);
ret = watchdog_register_device(&mt7621_wdt_dev);
return 0;
}
static int mt7621_wdt_remove(struct platform_device *pdev)
{
watchdog_unregister_device(&mt7621_wdt_dev);
return 0;
}
static void mt7621_wdt_shutdown(struct platform_device *pdev)
{
mt7621_wdt_stop(&mt7621_wdt_dev);
}
static const struct of_device_id mt7621_wdt_match[] = {
{ .compatible = "mediatek,mt7621-wdt" },
{},
};
MODULE_DEVICE_TABLE(of, mt7621_wdt_match);
static struct platform_driver mt7621_wdt_driver = {
.probe = mt7621_wdt_probe,
.remove = mt7621_wdt_remove,
.shutdown = mt7621_wdt_shutdown,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = mt7621_wdt_match,
},
};
module_platform_driver(mt7621_wdt_driver);
MODULE_DESCRIPTION("MediaTek MT762x hardware watchdog driver");
MODULE_AUTHOR("John Crispin <blogic@openwrt.org");
MODULE_LICENSE("GPL v2");

22
drivers/watchdog/mtk_wdt.c
View File

@ -28,8 +28,6 @@
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#define WDT_MAX_TIMEOUT 31
@ -64,16 +62,13 @@ static unsigned int timeout = WDT_MAX_TIMEOUT;
struct mtk_wdt_dev {
struct watchdog_device wdt_dev;
void __iomem *wdt_base;
struct notifier_block restart_handler;
};
static int mtk_reset_handler(struct notifier_block *this, unsigned long mode,
void *cmd)
static int mtk_wdt_restart(struct watchdog_device *wdt_dev)
{
struct mtk_wdt_dev *mtk_wdt;
struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
void __iomem *wdt_base;
mtk_wdt = container_of(this, struct mtk_wdt_dev, restart_handler);
wdt_base = mtk_wdt->wdt_base;
while (1) {
@ -81,7 +76,7 @@ static int mtk_reset_handler(struct notifier_block *this, unsigned long mode,
mdelay(5);
}
return NOTIFY_DONE;
return 0;
}
static int mtk_wdt_ping(struct watchdog_device *wdt_dev)
@ -161,6 +156,7 @@ static const struct watchdog_ops mtk_wdt_ops = {
.stop = mtk_wdt_stop,
.ping = mtk_wdt_ping,
.set_timeout = mtk_wdt_set_timeout,
.restart = mtk_wdt_restart,
};
static int mtk_wdt_probe(struct platform_device *pdev)
@ -189,6 +185,7 @@ static int mtk_wdt_probe(struct platform_device *pdev)
watchdog_init_timeout(&mtk_wdt->wdt_dev, timeout, &pdev->dev);
watchdog_set_nowayout(&mtk_wdt->wdt_dev, nowayout);
watchdog_set_restart_priority(&mtk_wdt->wdt_dev, 128);
watchdog_set_drvdata(&mtk_wdt->wdt_dev, mtk_wdt);
@ -198,13 +195,6 @@ static int mtk_wdt_probe(struct platform_device *pdev)
if (unlikely(err))
return err;
mtk_wdt->restart_handler.notifier_call = mtk_reset_handler;
mtk_wdt->restart_handler.priority = 128;
err = register_restart_handler(&mtk_wdt->restart_handler);
if (err)
dev_warn(&pdev->dev,
"cannot register restart handler (err=%d)\n", err);
dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n",
mtk_wdt->wdt_dev.timeout, nowayout);
@ -223,8 +213,6 @@ static int mtk_wdt_remove(struct platform_device *pdev)
{
struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&mtk_wdt->restart_handler);
watchdog_unregister_device(&mtk_wdt->wdt_dev);
return 0;

7
drivers/watchdog/omap_wdt.c
View File

@ -271,7 +271,8 @@ static int omap_wdt_probe(struct platform_device *pdev)
wdev->wdog.bootstatus = WDIOF_CARDRESET;
}
omap_wdt_disable(wdev);
if (!early_enable)
omap_wdt_disable(wdev);
ret = watchdog_register_device(&wdev->wdog);
if (ret) {
@ -283,11 +284,11 @@ static int omap_wdt_probe(struct platform_device *pdev)
readl_relaxed(wdev->base + OMAP_WATCHDOG_REV) & 0xFF,
wdev->wdog.timeout);
pm_runtime_put_sync(wdev->dev);
if (early_enable)
omap_wdt_start(&wdev->wdog);
pm_runtime_put(wdev->dev);
return 0;
}

50
drivers/watchdog/qcom-wdt.c
View File

@ -17,7 +17,6 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/watchdog.h>
#define WDT_RST 0x38
@ -28,7 +27,6 @@ struct qcom_wdt {
struct watchdog_device wdd;
struct clk *clk;
unsigned long rate;
struct notifier_block restart_nb;
void __iomem *base;
};
@ -72,25 +70,9 @@ static int qcom_wdt_set_timeout(struct watchdog_device *wdd,
return qcom_wdt_start(wdd);
}
static const struct watchdog_ops qcom_wdt_ops = {
.start = qcom_wdt_start,
.stop = qcom_wdt_stop,
.ping = qcom_wdt_ping,
.set_timeout = qcom_wdt_set_timeout,
.owner = THIS_MODULE,
};
static const struct watchdog_info qcom_wdt_info = {
.options = WDIOF_KEEPALIVEPING
| WDIOF_MAGICCLOSE
| WDIOF_SETTIMEOUT,
.identity = KBUILD_MODNAME,
};
static int qcom_wdt_restart(struct notifier_block *nb, unsigned long action,
void *data)
static int qcom_wdt_restart(struct watchdog_device *wdd)
{
struct qcom_wdt *wdt = container_of(nb, struct qcom_wdt, restart_nb);
struct qcom_wdt *wdt = to_qcom_wdt(wdd);
u32 timeout;
/*
@ -110,9 +92,25 @@ static int qcom_wdt_restart(struct notifier_block *nb, unsigned long action,
wmb();
msleep(150);
return NOTIFY_DONE;
return 0;
}
static const struct watchdog_ops qcom_wdt_ops = {
.start = qcom_wdt_start,
.stop = qcom_wdt_stop,
.ping = qcom_wdt_ping,
.set_timeout = qcom_wdt_set_timeout,
.restart = qcom_wdt_restart,
.owner = THIS_MODULE,
};
static const struct watchdog_info qcom_wdt_info = {
.options = WDIOF_KEEPALIVEPING
| WDIOF_MAGICCLOSE
| WDIOF_SETTIMEOUT,
.identity = KBUILD_MODNAME,
};
static int qcom_wdt_probe(struct platform_device *pdev)
{
struct qcom_wdt *wdt;
@ -166,7 +164,6 @@ static int qcom_wdt_probe(struct platform_device *pdev)
goto err_clk_unprepare;
}
wdt->wdd.dev = &pdev->dev;
wdt->wdd.info = &qcom_wdt_info;
wdt->wdd.ops = &qcom_wdt_ops;
wdt->wdd.min_timeout = 1;
@ -187,14 +184,6 @@ static int qcom_wdt_probe(struct platform_device *pdev)
goto err_clk_unprepare;
}
/*
* WDT restart notifier has priority 0 (use as a last resort)
*/
wdt->restart_nb.notifier_call = qcom_wdt_restart;
ret = register_restart_handler(&wdt->restart_nb);
if (ret)
dev_err(&pdev->dev, "failed to setup restart handler\n");
platform_set_drvdata(pdev, wdt);
return 0;
@ -207,7 +196,6 @@ static int qcom_wdt_remove(struct platform_device *pdev)
{
struct qcom_wdt *wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&wdt->restart_nb);
watchdog_unregister_device(&wdt->wdd);
clk_disable_unprepare(wdt->clk);
return 0;

60
drivers/watchdog/s3c2410_wdt.c
View File

@ -41,7 +41,6 @@
#include <linux/of.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#define S3C2410_WTCON 0x00
@ -130,7 +129,6 @@ struct s3c2410_wdt {
unsigned long wtdat_save;
struct watchdog_device wdt_device;
struct notifier_block freq_transition;
struct notifier_block restart_handler;
struct s3c2410_wdt_variant *drv_data;
struct regmap *pmureg;
};
@ -351,6 +349,29 @@ static int s3c2410wdt_set_heartbeat(struct watchdog_device *wdd, unsigned timeou
return 0;
}
static int s3c2410wdt_restart(struct watchdog_device *wdd)
{
struct s3c2410_wdt *wdt = watchdog_get_drvdata(wdd);
void __iomem *wdt_base = wdt->reg_base;
/* disable watchdog, to be safe */
writel(0, wdt_base + S3C2410_WTCON);
/* put initial values into count and data */
writel(0x80, wdt_base + S3C2410_WTCNT);
writel(0x80, wdt_base + S3C2410_WTDAT);
/* set the watchdog to go and reset... */
writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV16 |
S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20),
wdt_base + S3C2410_WTCON);
/* wait for reset to assert... */
mdelay(500);
return 0;
}
#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)
static const struct watchdog_info s3c2410_wdt_ident = {
@ -365,6 +386,7 @@ static struct watchdog_ops s3c2410wdt_ops = {
.stop = s3c2410wdt_stop,
.ping = s3c2410wdt_keepalive,
.set_timeout = s3c2410wdt_set_heartbeat,
.restart = s3c2410wdt_restart,
};
static struct watchdog_device s3c2410_wdd = {
@ -452,31 +474,6 @@ static inline void s3c2410wdt_cpufreq_deregister(struct s3c2410_wdt *wdt)
}
#endif
static int s3c2410wdt_restart(struct notifier_block *this,
unsigned long mode, void *cmd)
{
struct s3c2410_wdt *wdt = container_of(this, struct s3c2410_wdt,
restart_handler);
void __iomem *wdt_base = wdt->reg_base;
/* disable watchdog, to be safe */
writel(0, wdt_base + S3C2410_WTCON);
/* put initial values into count and data */
writel(0x80, wdt_base + S3C2410_WTCNT);
writel(0x80, wdt_base + S3C2410_WTDAT);
/* set the watchdog to go and reset... */
writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV16 |
S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x20),
wdt_base + S3C2410_WTCON);
/* wait for reset to assert... */
mdelay(500);
return NOTIFY_DONE;
}
static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt)
{
unsigned int rst_stat;
@ -605,6 +602,7 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
}
watchdog_set_nowayout(&wdt->wdt_device, nowayout);
watchdog_set_restart_priority(&wdt->wdt_device, 128);
wdt->wdt_device.bootstatus = s3c2410wdt_get_bootstatus(wdt);
wdt->wdt_device.parent = &pdev->dev;
@ -632,12 +630,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, wdt);
wdt->restart_handler.notifier_call = s3c2410wdt_restart;
wdt->restart_handler.priority = 128;
ret = register_restart_handler(&wdt->restart_handler);
if (ret)
pr_err("cannot register restart handler, %d\n", ret);
/* print out a statement of readiness */
wtcon = readl(wdt->reg_base + S3C2410_WTCON);
@ -667,8 +659,6 @@ static int s3c2410wdt_remove(struct platform_device *dev)
int ret;
struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
unregister_restart_handler(&wdt->restart_handler);
ret = s3c2410wdt_mask_and_disable_reset(wdt, true);
if (ret < 0)
return ret;

38
drivers/watchdog/softdog.c
View File

@ -43,7 +43,6 @@
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/watchdog.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/jiffies.h>
@ -87,6 +86,7 @@ static struct timer_list watchdog_ticktock =
static void watchdog_fire(unsigned long data)
{
module_put(THIS_MODULE);
if (soft_noboot)
pr_crit("Triggered - Reboot ignored\n");
else if (soft_panic) {
@ -105,13 +105,16 @@ static void watchdog_fire(unsigned long data)
static int softdog_ping(struct watchdog_device *w)
{
mod_timer(&watchdog_ticktock, jiffies+(w->timeout*HZ));
if (!mod_timer(&watchdog_ticktock, jiffies+(w->timeout*HZ)))
__module_get(THIS_MODULE);
return 0;
}
static int softdog_stop(struct watchdog_device *w)
{
del_timer(&watchdog_ticktock);
if (del_timer(&watchdog_ticktock))
module_put(THIS_MODULE);
return 0;
}
@ -121,27 +124,10 @@ static int softdog_set_timeout(struct watchdog_device *w, unsigned int t)
return 0;
}
/*
* Notifier for system down
*/
static int softdog_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT)
/* Turn the WDT off */
softdog_stop(NULL);
return NOTIFY_DONE;
}
/*
* Kernel Interfaces
*/
static struct notifier_block softdog_notifier = {
.notifier_call = softdog_notify_sys,
};
static struct watchdog_info softdog_info = {
.identity = "Software Watchdog",
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
@ -175,18 +161,11 @@ static int __init watchdog_init(void)
softdog_dev.timeout = soft_margin;
watchdog_set_nowayout(&softdog_dev, nowayout);
ret = register_reboot_notifier(&softdog_notifier);
if (ret) {
pr_err("cannot register reboot notifier (err=%d)\n", ret);
return ret;
}
watchdog_stop_on_reboot(&softdog_dev);
ret = watchdog_register_device(&softdog_dev);
if (ret) {
unregister_reboot_notifier(&softdog_notifier);
if (ret)
return ret;
}
pr_info("Software Watchdog Timer: 0.08 initialized. soft_noboot=%d soft_margin=%d sec soft_panic=%d (nowayout=%d)\n",
soft_noboot, soft_margin, soft_panic, nowayout);
@ -197,7 +176,6 @@ static int __init watchdog_init(void)
static void __exit watchdog_exit(void)
{
watchdog_unregister_device(&softdog_dev);
unregister_reboot_notifier(&softdog_notifier);
}
module_init(watchdog_init);

32
drivers/watchdog/sp5100_tco.c
View File

@ -306,6 +306,10 @@ static struct miscdevice sp5100_tco_miscdev = {
static const struct pci_device_id sp5100_tco_pci_tbl[] = {
{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
PCI_ANY_ID, },
{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID,
PCI_ANY_ID, },
{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
PCI_ANY_ID, },
{ 0, }, /* End of list */
};
MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
@ -331,21 +335,24 @@ static unsigned char sp5100_tco_setupdevice(void)
if (!sp5100_tco_pci)
return 0;
pr_info("PCI Revision ID: 0x%x\n", sp5100_tco_pci->revision);
pr_info("PCI Vendor ID: 0x%x, Device ID: 0x%x, Revision ID: 0x%x\n",
sp5100_tco_pci->vendor, sp5100_tco_pci->device,
sp5100_tco_pci->revision);
/*
* Determine type of southbridge chipset.
*/
if (sp5100_tco_pci->revision >= 0x40) {
dev_name = SB800_DEVNAME;
index_reg = SB800_IO_PM_INDEX_REG;
data_reg = SB800_IO_PM_DATA_REG;
base_addr = SB800_PM_WATCHDOG_BASE;
} else {
if (sp5100_tco_pci->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
sp5100_tco_pci->revision < 0x40) {
dev_name = SP5100_DEVNAME;
index_reg = SP5100_IO_PM_INDEX_REG;
data_reg = SP5100_IO_PM_DATA_REG;
base_addr = SP5100_PM_WATCHDOG_BASE;
} else {
dev_name = SB800_DEVNAME;
index_reg = SB800_IO_PM_INDEX_REG;
data_reg = SB800_IO_PM_DATA_REG;
base_addr = SB800_PM_WATCHDOG_BASE;
}
/* Request the IO ports used by this driver */
@ -381,7 +388,12 @@ static unsigned char sp5100_tco_setupdevice(void)
* Secondly, Find the watchdog timer MMIO address
* from SBResource_MMIO register.
*/
if (sp5100_tco_pci->revision >= 0x40) {
if (sp5100_tco_pci->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
sp5100_tco_pci->revision < 0x40) {
/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
pci_read_config_dword(sp5100_tco_pci,
SP5100_SB_RESOURCE_MMIO_BASE, &val);
} else {
/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
outb(SB800_PM_ACPI_MMIO_EN+3, SB800_IO_PM_INDEX_REG);
val = inb(SB800_IO_PM_DATA_REG);
@ -391,10 +403,6 @@ static unsigned char sp5100_tco_setupdevice(void)
val = val << 8 | inb(SB800_IO_PM_DATA_REG);
outb(SB800_PM_ACPI_MMIO_EN+0, SB800_IO_PM_INDEX_REG);
val = val << 8 | inb(SB800_IO_PM_DATA_REG);
} else {
/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
pci_read_config_dword(sp5100_tco_pci,
SP5100_SB_RESOURCE_MMIO_BASE, &val);
}
/* The SBResource_MMIO is enabled and mapped memory space? */

25
drivers/watchdog/stmp3xxx_rtc_wdt.c
View File

@ -14,6 +14,8 @@
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/stmp3xxx_rtc_wdt.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#define WDOG_TICK_RATE 1000 /* 1 kHz clock */
#define STMP3XXX_DEFAULT_TIMEOUT 19
@ -69,6 +71,25 @@ static struct watchdog_device stmp3xxx_wdd = {
.status = WATCHDOG_NOWAYOUT_INIT_STATUS,
};
static int wdt_notify_sys(struct notifier_block *nb, unsigned long code,
void *unused)
{
switch (code) {
case SYS_DOWN: /* keep enabled, system might crash while going down */
break;
case SYS_HALT: /* allow the system to actually halt */
case SYS_POWER_OFF:
wdt_stop(&stmp3xxx_wdd);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};
static int stmp3xxx_wdt_probe(struct platform_device *pdev)
{
int ret;
@ -84,6 +105,9 @@ static int stmp3xxx_wdt_probe(struct platform_device *pdev)
return ret;
}
if (register_reboot_notifier(&wdt_notifier))
dev_warn(&pdev->dev, "cannot register reboot notifier\n");
dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n",
stmp3xxx_wdd.timeout);
return 0;
@ -91,6 +115,7 @@ static int stmp3xxx_wdt_probe(struct platform_device *pdev)
static int stmp3xxx_wdt_remove(struct platform_device *pdev)
{
unregister_reboot_notifier(&wdt_notifier);
watchdog_unregister_device(&stmp3xxx_wdd);
return 0;
}

23
drivers/watchdog/sunxi_wdt.c
View File

@ -21,11 +21,9 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/types.h>
#include <linux/watchdog.h>
@ -60,7 +58,6 @@ struct sunxi_wdt_dev {
struct watchdog_device wdt_dev;
void __iomem *wdt_base;
const struct sunxi_wdt_reg *wdt_regs;
struct notifier_block restart_handler;
};
/*
@ -86,12 +83,9 @@ static const int wdt_timeout_map[] = {
};
static int sunxi_restart_handle(struct notifier_block *this, unsigned long mode,
void *cmd)
static int sunxi_wdt_restart(struct watchdog_device *wdt_dev)
{
struct sunxi_wdt_dev *sunxi_wdt = container_of(this,
struct sunxi_wdt_dev,
restart_handler);
struct sunxi_wdt_dev *sunxi_wdt = watchdog_get_drvdata(wdt_dev);
void __iomem *wdt_base = sunxi_wdt->wdt_base;
const struct sunxi_wdt_reg *regs = sunxi_wdt->wdt_regs;
u32 val;
@ -120,7 +114,7 @@ static int sunxi_restart_handle(struct notifier_block *this, unsigned long mode,
val |= WDT_MODE_EN;
writel(val, wdt_base + regs->wdt_mode);
}
return NOTIFY_DONE;
return 0;
}
static int sunxi_wdt_ping(struct watchdog_device *wdt_dev)
@ -208,6 +202,7 @@ static const struct watchdog_ops sunxi_wdt_ops = {
.stop = sunxi_wdt_stop,
.ping = sunxi_wdt_ping,
.set_timeout = sunxi_wdt_set_timeout,
.restart = sunxi_wdt_restart,
};
static const struct sunxi_wdt_reg sun4i_wdt_reg = {
@ -268,6 +263,7 @@ static int sunxi_wdt_probe(struct platform_device *pdev)
watchdog_init_timeout(&sunxi_wdt->wdt_dev, timeout, &pdev->dev);
watchdog_set_nowayout(&sunxi_wdt->wdt_dev, nowayout);
watchdog_set_restart_priority(&sunxi_wdt->wdt_dev, 128);
watchdog_set_drvdata(&sunxi_wdt->wdt_dev, sunxi_wdt);
@ -277,13 +273,6 @@ static int sunxi_wdt_probe(struct platform_device *pdev)
if (unlikely(err))
return err;
sunxi_wdt->restart_handler.notifier_call = sunxi_restart_handle;
sunxi_wdt->restart_handler.priority = 128;
err = register_restart_handler(&sunxi_wdt->restart_handler);
if (err)
dev_err(&pdev->dev,
"cannot register restart handler (err=%d)\n", err);
dev_info(&pdev->dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)",
sunxi_wdt->wdt_dev.timeout, nowayout);
@ -294,8 +283,6 @@ static int sunxi_wdt_remove(struct platform_device *pdev)
{
struct sunxi_wdt_dev *sunxi_wdt = platform_get_drvdata(pdev);
unregister_restart_handler(&sunxi_wdt->restart_handler);
watchdog_unregister_device(&sunxi_wdt->wdt_dev);
watchdog_set_drvdata(&sunxi_wdt->wdt_dev, NULL);

225
drivers/watchdog/tangox_wdt.c Normal file
View File

@ -0,0 +1,225 @@
/*
* Copyright (C) 2015 Mans Rullgard <mans@mansr.com>
* SMP86xx/SMP87xx Watchdog driver
*
* 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.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/watchdog.h>
#define DEFAULT_TIMEOUT 30
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 int timeout;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout");
/*
* Counter counts down from programmed value. Reset asserts when
* the counter reaches 1.
*/
#define WD_COUNTER 0
#define WD_CONFIG 4
#define WD_CONFIG_XTAL_IN BIT(0)
#define WD_CONFIG_DISABLE BIT(31)
struct tangox_wdt_device {
struct watchdog_device wdt;
void __iomem *base;
unsigned long clk_rate;
struct clk *clk;
struct notifier_block restart;
};
static int tangox_wdt_set_timeout(struct watchdog_device *wdt,
unsigned int new_timeout)
{
wdt->timeout = new_timeout;
return 0;
}
static int tangox_wdt_start(struct watchdog_device *wdt)
{
struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt);
u32 ticks;
ticks = 1 + wdt->timeout * dev->clk_rate;
writel(ticks, dev->base + WD_COUNTER);
return 0;
}
static int tangox_wdt_stop(struct watchdog_device *wdt)
{
struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt);
writel(0, dev->base + WD_COUNTER);
return 0;
}
static unsigned int tangox_wdt_get_timeleft(struct watchdog_device *wdt)
{
struct tangox_wdt_device *dev = watchdog_get_drvdata(wdt);
u32 count;
count = readl(dev->base + WD_COUNTER);
if (!count)
return 0;
return (count - 1) / dev->clk_rate;
}
static const struct watchdog_info tangox_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
.identity = "tangox watchdog",
};
static const struct watchdog_ops tangox_wdt_ops = {
.start = tangox_wdt_start,
.stop = tangox_wdt_stop,
.set_timeout = tangox_wdt_set_timeout,
.get_timeleft = tangox_wdt_get_timeleft,
};
static int tangox_wdt_restart(struct notifier_block *nb, unsigned long action,
void *data)
{
struct tangox_wdt_device *dev =
container_of(nb, struct tangox_wdt_device, restart);
writel(1, dev->base + WD_COUNTER);
return NOTIFY_DONE;
}
static int tangox_wdt_probe(struct platform_device *pdev)
{
struct tangox_wdt_device *dev;
struct resource *res;
u32 config;
int err;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dev->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(dev->base))
return PTR_ERR(dev->base);
dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk))
return PTR_ERR(dev->clk);
err = clk_prepare_enable(dev->clk);
if (err)
return err;
dev->clk_rate = clk_get_rate(dev->clk);
dev->wdt.parent = &pdev->dev;
dev->wdt.info = &tangox_wdt_info;
dev->wdt.ops = &tangox_wdt_ops;
dev->wdt.timeout = DEFAULT_TIMEOUT;
dev->wdt.min_timeout = 1;
dev->wdt.max_timeout = (U32_MAX - 1) / dev->clk_rate;
watchdog_init_timeout(&dev->wdt, timeout, &pdev->dev);
watchdog_set_nowayout(&dev->wdt, nowayout);
watchdog_set_drvdata(&dev->wdt, dev);
/*
* Deactivate counter if disable bit is set to avoid
* accidental reset.
*/
config = readl(dev->base + WD_CONFIG);
if (config & WD_CONFIG_DISABLE)
writel(0, dev->base + WD_COUNTER);
writel(WD_CONFIG_XTAL_IN, dev->base + WD_CONFIG);
/*
* Mark as active and restart with configured timeout if
* already running.
*/
if (readl(dev->base + WD_COUNTER)) {
set_bit(WDOG_ACTIVE, &dev->wdt.status);
tangox_wdt_start(&dev->wdt);
}
err = watchdog_register_device(&dev->wdt);
if (err) {
clk_disable_unprepare(dev->clk);
return err;
}
platform_set_drvdata(pdev, dev);
dev->restart.notifier_call = tangox_wdt_restart;
dev->restart.priority = 128;
err = register_restart_handler(&dev->restart);
if (err)
dev_warn(&pdev->dev, "failed to register restart handler\n");
dev_info(&pdev->dev, "SMP86xx/SMP87xx watchdog registered\n");
return 0;
}
static int tangox_wdt_remove(struct platform_device *pdev)
{
struct tangox_wdt_device *dev = platform_get_drvdata(pdev);
tangox_wdt_stop(&dev->wdt);
clk_disable_unprepare(dev->clk);
unregister_restart_handler(&dev->restart);
watchdog_unregister_device(&dev->wdt);
return 0;
}
static const struct of_device_id tangox_wdt_dt_ids[] = {
{ .compatible = "sigma,smp8642-wdt" },
{ .compatible = "sigma,smp8759-wdt" },
{ }
};
MODULE_DEVICE_TABLE(of, tangox_wdt_dt_ids);
static struct platform_driver tangox_wdt_driver = {
.probe = tangox_wdt_probe,
.remove = tangox_wdt_remove,
.driver = {
.name = "tangox-wdt",
.of_match_table = tangox_wdt_dt_ids,
},
};
module_platform_driver(tangox_wdt_driver);
MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>");
MODULE_DESCRIPTION("SMP86xx/SMP87xx Watchdog driver");
MODULE_LICENSE("GPL");

215
drivers/watchdog/ts4800_wdt.c Normal file
View File

@ -0,0 +1,215 @@
/*
* Watchdog driver for TS-4800 based boards
*
* Copyright (c) 2015 - Savoir-faire Linux
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/watchdog.h>
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) ")");
/* possible feed values */
#define TS4800_WDT_FEED_2S 0x1
#define TS4800_WDT_FEED_10S 0x2
#define TS4800_WDT_DISABLE 0x3
struct ts4800_wdt {
struct watchdog_device wdd;
struct regmap *regmap;
u32 feed_offset;
u32 feed_val;
};
/*
* TS-4800 supports the following timeout values:
*
* value desc
* ---------------------
* 0 feed for 338ms
* 1 feed for 2.706s
* 2 feed for 10.824s
* 3 disable watchdog
*
* Keep the regmap/timeout map ordered by timeout
*/
static const struct {
const int timeout;
const int regval;
} ts4800_wdt_map[] = {
{ 2, TS4800_WDT_FEED_2S },
{ 10, TS4800_WDT_FEED_10S },
};
#define MAX_TIMEOUT_INDEX (ARRAY_SIZE(ts4800_wdt_map) - 1)
static void ts4800_write_feed(struct ts4800_wdt *wdt, u32 val)
{
regmap_write(wdt->regmap, wdt->feed_offset, val);
}
static int ts4800_wdt_start(struct watchdog_device *wdd)
{
struct ts4800_wdt *wdt = watchdog_get_drvdata(wdd);
ts4800_write_feed(wdt, wdt->feed_val);
return 0;
}
static int ts4800_wdt_stop(struct watchdog_device *wdd)
{
struct ts4800_wdt *wdt = watchdog_get_drvdata(wdd);
ts4800_write_feed(wdt, TS4800_WDT_DISABLE);
return 0;
}
static int ts4800_wdt_set_timeout(struct watchdog_device *wdd,
unsigned int timeout)
{
struct ts4800_wdt *wdt = watchdog_get_drvdata(wdd);
int i;
for (i = 0; i < MAX_TIMEOUT_INDEX; i++) {
if (ts4800_wdt_map[i].timeout >= timeout)
break;
}
wdd->timeout = ts4800_wdt_map[i].timeout;
wdt->feed_val = ts4800_wdt_map[i].regval;
return 0;
}
static const struct watchdog_ops ts4800_wdt_ops = {
.owner = THIS_MODULE,
.start = ts4800_wdt_start,
.stop = ts4800_wdt_stop,
.set_timeout = ts4800_wdt_set_timeout,
};
static const struct watchdog_info ts4800_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
.identity = "TS-4800 Watchdog",
};
static int ts4800_wdt_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *syscon_np;
struct watchdog_device *wdd;
struct ts4800_wdt *wdt;
u32 reg;
int ret;
syscon_np = of_parse_phandle(np, "syscon", 0);
if (!syscon_np) {
dev_err(&pdev->dev, "no syscon property\n");
return -ENODEV;
}
ret = of_property_read_u32_index(np, "syscon", 1, &reg);
if (ret < 0) {
dev_err(&pdev->dev, "no offset in syscon\n");
return ret;
}
/* allocate memory for watchdog struct */
wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
/* set regmap and offset to know where to write */
wdt->feed_offset = reg;
wdt->regmap = syscon_node_to_regmap(syscon_np);
if (IS_ERR(wdt->regmap)) {
dev_err(&pdev->dev, "cannot get parent's regmap\n");
return PTR_ERR(wdt->regmap);
}
/* Initialize struct watchdog_device */
wdd = &wdt->wdd;
wdd->parent = &pdev->dev;
wdd->info = &ts4800_wdt_info;
wdd->ops = &ts4800_wdt_ops;
wdd->min_timeout = ts4800_wdt_map[0].timeout;
wdd->max_timeout = ts4800_wdt_map[MAX_TIMEOUT_INDEX].timeout;
watchdog_set_drvdata(wdd, wdt);
watchdog_set_nowayout(wdd, nowayout);
watchdog_init_timeout(wdd, 0, &pdev->dev);
/*
* As this watchdog supports only a few values, ts4800_wdt_set_timeout
* must be called to initialize timeout and feed_val with valid values.
* Default to maximum timeout if none, or an invalid one, is provided in
* device tree.
*/
if (!wdd->timeout)
wdd->timeout = wdd->max_timeout;
ts4800_wdt_set_timeout(wdd, wdd->timeout);
/*
* The feed register is write-only, so it is not possible to determine
* watchdog's state. Disable it to be in a known state.
*/
ts4800_wdt_stop(wdd);
ret = watchdog_register_device(wdd);
if (ret) {
dev_err(&pdev->dev,
"failed to register watchdog device\n");
return ret;
}
platform_set_drvdata(pdev, wdt);
dev_info(&pdev->dev,
"initialized (timeout = %d sec, nowayout = %d)\n",
wdd->timeout, nowayout);
return 0;
}
static int ts4800_wdt_remove(struct platform_device *pdev)
{
struct ts4800_wdt *wdt = platform_get_drvdata(pdev);
watchdog_unregister_device(&wdt->wdd);
return 0;
}
static const struct of_device_id ts4800_wdt_of_match[] = {
{ .compatible = "technologic,ts4800-wdt", },
{ },
};
MODULE_DEVICE_TABLE(of, ts4800_wdt_of_match);
static struct platform_driver ts4800_wdt_driver = {
.probe = ts4800_wdt_probe,
.remove = ts4800_wdt_remove,
.driver = {
.name = "ts4800_wdt",
.of_match_table = ts4800_wdt_of_match,
},
};
module_platform_driver(ts4800_wdt_driver);
MODULE_AUTHOR("Damien Riegel <damien.riegel@savoirfairelinux.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:ts4800_wdt");

32
drivers/watchdog/w83627hf_wdt.c
View File

@ -36,8 +36,6 @@
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/io.h>
@ -287,18 +285,6 @@ static unsigned int wdt_get_time(struct watchdog_device *wdog)
return timeleft;
}
/*
* Notifier for system down
*/
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
if (code == SYS_DOWN || code == SYS_HALT)
wdt_set_time(0); /* Turn the WDT off */
return NOTIFY_DONE;
}
/*
* Kernel Interfaces
*/
@ -329,10 +315,6 @@ static struct watchdog_device wdt_dev = {
* turn the timebomb registers off.
*/
static struct notifier_block wdt_notifier = {
.notifier_call = wdt_notify_sys,
};
static int wdt_find(int addr)
{
u8 val;
@ -456,6 +438,7 @@ static int __init wdt_init(void)
watchdog_init_timeout(&wdt_dev, timeout, NULL);
watchdog_set_nowayout(&wdt_dev, nowayout);
watchdog_stop_on_reboot(&wdt_dev);
ret = w83627hf_init(&wdt_dev, chip);
if (ret) {
@ -463,30 +446,19 @@ static int __init wdt_init(void)
return ret;
}
ret = register_reboot_notifier(&wdt_notifier);
if (ret != 0) {
pr_err("cannot register reboot notifier (err=%d)\n", ret);
return ret;
}
ret = watchdog_register_device(&wdt_dev);
if (ret)
goto unreg_reboot;
return ret;
pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
wdt_dev.timeout, nowayout);
return ret;
unreg_reboot:
unregister_reboot_notifier(&wdt_notifier);
return ret;
}
static void __exit wdt_exit(void)
{
watchdog_unregister_device(&wdt_dev);
unregister_reboot_notifier(&wdt_notifier);
}
module_init(wdt_init);

115
drivers/watchdog/watchdog_core.c
View File

@ -32,6 +32,7 @@
#include <linux/types.h> /* For standard types */
#include <linux/errno.h> /* For the -ENODEV/... values */
#include <linux/kernel.h> /* For printk/panic/... */
#include <linux/reboot.h> /* For restart handler */
#include <linux/watchdog.h> /* For watchdog specific items */
#include <linux/init.h> /* For __init/__exit/... */
#include <linux/idr.h> /* For ida_* macros */
@ -41,7 +42,6 @@
#include "watchdog_core.h" /* For watchdog_dev_register/... */
static DEFINE_IDA(watchdog_ida);
static struct class *watchdog_class;
/*
* Deferred Registration infrastructure.
@ -137,9 +137,63 @@ int watchdog_init_timeout(struct watchdog_device *wdd,
}
EXPORT_SYMBOL_GPL(watchdog_init_timeout);
static int watchdog_reboot_notifier(struct notifier_block *nb,
unsigned long code, void *data)
{
struct watchdog_device *wdd = container_of(nb, struct watchdog_device,
reboot_nb);
if (code == SYS_DOWN || code == SYS_HALT) {
if (watchdog_active(wdd)) {
int ret;
ret = wdd->ops->stop(wdd);
if (ret)
return NOTIFY_BAD;
}
}
return NOTIFY_DONE;
}
static int watchdog_restart_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct watchdog_device *wdd = container_of(nb, struct watchdog_device,
restart_nb);
int ret;
ret = wdd->ops->restart(wdd);
if (ret)
return NOTIFY_BAD;
return NOTIFY_DONE;
}
/**
* watchdog_set_restart_priority - Change priority of restart handler
* @wdd: watchdog device
* @priority: priority of the restart handler, should follow these guidelines:
* 0: use watchdog's restart function as last resort, has limited restart
* capabilies
* 128: default restart handler, use if no other handler is expected to be
* available and/or if restart is sufficient to restart the entire system
* 255: preempt all other handlers
*
* If a wdd->ops->restart function is provided when watchdog_register_device is
* called, it will be registered as a restart handler with the priority given
* here.
*/
void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority)
{
wdd->restart_nb.priority = priority;
}
EXPORT_SYMBOL_GPL(watchdog_set_restart_priority);
static int __watchdog_register_device(struct watchdog_device *wdd)
{
int ret, id = -1, devno;
int ret, id = -1;
if (wdd == NULL || wdd->info == NULL || wdd->ops == NULL)
return -EINVAL;
@ -156,8 +210,6 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
* corrupted in a later stage then we expect a kernel panic!
*/
mutex_init(&wdd->lock);
/* Use alias for watchdog id if possible */
if (wdd->parent) {
ret = of_alias_get_id(wdd->parent->of_node, "watchdog");
@ -192,14 +244,26 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
}
}
devno = wdd->cdev.dev;
wdd->dev = device_create(watchdog_class, wdd->parent, devno,
NULL, "watchdog%d", wdd->id);
if (IS_ERR(wdd->dev)) {
watchdog_dev_unregister(wdd);
ida_simple_remove(&watchdog_ida, id);
ret = PTR_ERR(wdd->dev);
return ret;
if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status)) {
wdd->reboot_nb.notifier_call = watchdog_reboot_notifier;
ret = register_reboot_notifier(&wdd->reboot_nb);
if (ret) {
pr_err("watchdog%d: Cannot register reboot notifier (%d)\n",
wdd->id, ret);
watchdog_dev_unregister(wdd);
ida_simple_remove(&watchdog_ida, wdd->id);
return ret;
}
}
if (wdd->ops->restart) {
wdd->restart_nb.notifier_call = watchdog_restart_notifier;
ret = register_restart_handler(&wdd->restart_nb);
if (ret)
pr_warn("watchog%d: Cannot register restart handler (%d)\n",
wdd->id, ret);
}
return 0;
@ -232,19 +296,17 @@ EXPORT_SYMBOL_GPL(watchdog_register_device);
static void __watchdog_unregister_device(struct watchdog_device *wdd)
{
int ret;
int devno;
if (wdd == NULL)
return;
devno = wdd->cdev.dev;
ret = watchdog_dev_unregister(wdd);
if (ret)
pr_err("error unregistering /dev/watchdog (err=%d)\n", ret);
device_destroy(watchdog_class, devno);
if (wdd->ops->restart)
unregister_restart_handler(&wdd->restart_nb);
if (test_bit(WDOG_STOP_ON_REBOOT, &wdd->status))
unregister_reboot_notifier(&wdd->reboot_nb);
watchdog_dev_unregister(wdd);
ida_simple_remove(&watchdog_ida, wdd->id);
wdd->dev = NULL;
}
/**
@ -287,17 +349,9 @@ static int __init watchdog_init(void)
{
int err;
watchdog_class = class_create(THIS_MODULE, "watchdog");
if (IS_ERR(watchdog_class)) {
pr_err("couldn't create class\n");
return PTR_ERR(watchdog_class);
}
err = watchdog_dev_init();
if (err < 0) {
class_destroy(watchdog_class);
if (err < 0)
return err;
}
watchdog_deferred_registration();
return 0;
@ -306,7 +360,6 @@ static int __init watchdog_init(void)
static void __exit watchdog_exit(void)
{
watchdog_dev_exit();
class_destroy(watchdog_class);
ida_destroy(&watchdog_ida);
}

2
drivers/watchdog/watchdog_core.h
View File

@ -32,6 +32,6 @@
* Functions/procedures to be called by the core
*/
extern int watchdog_dev_register(struct watchdog_device *);
extern int watchdog_dev_unregister(struct watchdog_device *);
extern void watchdog_dev_unregister(struct watchdog_device *);
extern int __init watchdog_dev_init(void);
extern void __exit watchdog_dev_exit(void);

616
drivers/watchdog/watchdog_dev.c
View File

@ -32,27 +32,51 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h> /* For module stuff/... */
#include <linux/types.h> /* For standard types (like size_t) */
#include <linux/cdev.h> /* For character device */
#include <linux/errno.h> /* For the -ENODEV/... values */
#include <linux/kernel.h> /* For printk/panic/... */
#include <linux/fs.h> /* For file operations */
#include <linux/watchdog.h> /* For watchdog specific items */
#include <linux/miscdevice.h> /* For handling misc devices */
#include <linux/init.h> /* For __init/__exit/... */
#include <linux/kernel.h> /* For printk/panic/... */
#include <linux/kref.h> /* For data references */
#include <linux/miscdevice.h> /* For handling misc devices */
#include <linux/module.h> /* For module stuff/... */
#include <linux/mutex.h> /* For mutexes */
#include <linux/slab.h> /* For memory functions */
#include <linux/types.h> /* For standard types (like size_t) */
#include <linux/watchdog.h> /* For watchdog specific items */
#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
#include "watchdog_core.h"
/*
* struct watchdog_core_data - watchdog core internal data
* @kref: Reference count.
* @cdev: The watchdog's Character device.
* @wdd: Pointer to watchdog device.
* @lock: Lock for watchdog core.
* @status: Watchdog core internal status bits.
*/
struct watchdog_core_data {
struct kref kref;
struct cdev cdev;
struct watchdog_device *wdd;
struct mutex lock;
unsigned long status; /* Internal status bits */
#define _WDOG_DEV_OPEN 0 /* Opened ? */
#define _WDOG_ALLOW_RELEASE 1 /* Did we receive the magic char ? */
};
/* the dev_t structure to store the dynamically allocated watchdog devices */
static dev_t watchdog_devt;
/* the watchdog device behind /dev/watchdog */
static struct watchdog_device *old_wdd;
/* Reference to watchdog device behind /dev/watchdog */
static struct watchdog_core_data *old_wd_data;
/*
* watchdog_ping: ping the watchdog.
* @wdd: the watchdog device to ping
*
* The caller must hold wd_data->lock.
*
* If the watchdog has no own ping operation then it needs to be
* restarted via the start operation. This wrapper function does
* exactly that.
@ -61,25 +85,16 @@ static struct watchdog_device *old_wdd;
static int watchdog_ping(struct watchdog_device *wdd)
{
int err = 0;
mutex_lock(&wdd->lock);
if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_ping;
}
int err;
if (!watchdog_active(wdd))
goto out_ping;
return 0;
if (wdd->ops->ping)
err = wdd->ops->ping(wdd); /* ping the watchdog */
else
err = wdd->ops->start(wdd); /* restart watchdog */
out_ping:
mutex_unlock(&wdd->lock);
return err;
}
@ -87,6 +102,8 @@ static int watchdog_ping(struct watchdog_device *wdd)
* watchdog_start: wrapper to start the watchdog.
* @wdd: the watchdog device to start
*
* The caller must hold wd_data->lock.
*
* Start the watchdog if it is not active and mark it active.
* This function returns zero on success or a negative errno code for
* failure.
@ -94,24 +111,15 @@ static int watchdog_ping(struct watchdog_device *wdd)
static int watchdog_start(struct watchdog_device *wdd)
{
int err = 0;
mutex_lock(&wdd->lock);
if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_start;
}
int err;
if (watchdog_active(wdd))
goto out_start;
return 0;
err = wdd->ops->start(wdd);
if (err == 0)
set_bit(WDOG_ACTIVE, &wdd->status);
out_start:
mutex_unlock(&wdd->lock);
return err;
}
@ -119,6 +127,8 @@ static int watchdog_start(struct watchdog_device *wdd)
* watchdog_stop: wrapper to stop the watchdog.
* @wdd: the watchdog device to stop
*
* The caller must hold wd_data->lock.
*
* Stop the watchdog if it is still active and unmark it active.
* This function returns zero on success or a negative errno code for
* failure.
@ -127,93 +137,59 @@ static int watchdog_start(struct watchdog_device *wdd)
static int watchdog_stop(struct watchdog_device *wdd)
{
int err = 0;
mutex_lock(&wdd->lock);
if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_stop;
}
int err;
if (!watchdog_active(wdd))
goto out_stop;
return 0;
if (test_bit(WDOG_NO_WAY_OUT, &wdd->status)) {
dev_info(wdd->dev, "nowayout prevents watchdog being stopped!\n");
err = -EBUSY;
goto out_stop;
pr_info("watchdog%d: nowayout prevents watchdog being stopped!\n",
wdd->id);
return -EBUSY;
}
err = wdd->ops->stop(wdd);
if (err == 0)
clear_bit(WDOG_ACTIVE, &wdd->status);
out_stop:
mutex_unlock(&wdd->lock);
return err;
}
/*
* watchdog_get_status: wrapper to get the watchdog status
* @wdd: the watchdog device to get the status from
* @status: the status of the watchdog device
*
* The caller must hold wd_data->lock.
*
* Get the watchdog's status flags.
*/
static int watchdog_get_status(struct watchdog_device *wdd,
unsigned int *status)
static unsigned int watchdog_get_status(struct watchdog_device *wdd)
{
int err = 0;
*status = 0;
if (!wdd->ops->status)
return -EOPNOTSUPP;
return 0;
mutex_lock(&wdd->lock);
if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_status;
}
*status = wdd->ops->status(wdd);
out_status:
mutex_unlock(&wdd->lock);
return err;
return wdd->ops->status(wdd);
}
/*
* watchdog_set_timeout: set the watchdog timer timeout
* @wdd: the watchdog device to set the timeout for
* @timeout: timeout to set in seconds
*
* The caller must hold wd_data->lock.
*/
static int watchdog_set_timeout(struct watchdog_device *wdd,
unsigned int timeout)
{
int err;
if (!wdd->ops->set_timeout || !(wdd->info->options & WDIOF_SETTIMEOUT))
return -EOPNOTSUPP;
if (watchdog_timeout_invalid(wdd, timeout))
return -EINVAL;
mutex_lock(&wdd->lock);
if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_timeout;
}
err = wdd->ops->set_timeout(wdd, timeout);
out_timeout:
mutex_unlock(&wdd->lock);
return err;
return wdd->ops->set_timeout(wdd, timeout);
}
/*
@ -221,59 +197,156 @@ static int watchdog_set_timeout(struct watchdog_device *wdd,
* @wdd: the watchdog device to get the remaining time from
* @timeleft: the time that's left
*
* The caller must hold wd_data->lock.
*
* Get the time before a watchdog will reboot (if not pinged).
*/
static int watchdog_get_timeleft(struct watchdog_device *wdd,
unsigned int *timeleft)
{
int err = 0;
*timeleft = 0;
if (!wdd->ops->get_timeleft)
return -EOPNOTSUPP;
mutex_lock(&wdd->lock);
if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_timeleft;
}
*timeleft = wdd->ops->get_timeleft(wdd);
out_timeleft:
mutex_unlock(&wdd->lock);
return err;
return 0;
}
#ifdef CONFIG_WATCHDOG_SYSFS
static ssize_t nowayout_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", !!test_bit(WDOG_NO_WAY_OUT, &wdd->status));
}
static DEVICE_ATTR_RO(nowayout);
static ssize_t status_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
struct watchdog_core_data *wd_data = wdd->wd_data;
unsigned int status;
mutex_lock(&wd_data->lock);
status = watchdog_get_status(wdd);
mutex_unlock(&wd_data->lock);
return sprintf(buf, "%u\n", status);
}
static DEVICE_ATTR_RO(status);
static ssize_t bootstatus_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", wdd->bootstatus);
}
static DEVICE_ATTR_RO(bootstatus);
static ssize_t timeleft_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
struct watchdog_core_data *wd_data = wdd->wd_data;
ssize_t status;
unsigned int val;
mutex_lock(&wd_data->lock);
status = watchdog_get_timeleft(wdd, &val);
mutex_unlock(&wd_data->lock);
if (!status)
status = sprintf(buf, "%u\n", val);
return status;
}
static DEVICE_ATTR_RO(timeleft);
static ssize_t timeout_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", wdd->timeout);
}
static DEVICE_ATTR_RO(timeout);
static ssize_t identity_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", wdd->info->identity);
}
static DEVICE_ATTR_RO(identity);
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct watchdog_device *wdd = dev_get_drvdata(dev);
if (watchdog_active(wdd))
return sprintf(buf, "active\n");
return sprintf(buf, "inactive\n");
}
static DEVICE_ATTR_RO(state);
static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct watchdog_device *wdd = dev_get_drvdata(dev);
umode_t mode = attr->mode;
if (attr == &dev_attr_status.attr && !wdd->ops->status)
mode = 0;
else if (attr == &dev_attr_timeleft.attr && !wdd->ops->get_timeleft)
mode = 0;
return mode;
}
static struct attribute *wdt_attrs[] = {
&dev_attr_state.attr,
&dev_attr_identity.attr,
&dev_attr_timeout.attr,
&dev_attr_timeleft.attr,
&dev_attr_bootstatus.attr,
&dev_attr_status.attr,
&dev_attr_nowayout.attr,
NULL,
};
static const struct attribute_group wdt_group = {
.attrs = wdt_attrs,
.is_visible = wdt_is_visible,
};
__ATTRIBUTE_GROUPS(wdt);
#else
#define wdt_groups NULL
#endif
/*
* watchdog_ioctl_op: call the watchdog drivers ioctl op if defined
* @wdd: the watchdog device to do the ioctl on
* @cmd: watchdog command
* @arg: argument pointer
*
* The caller must hold wd_data->lock.
*/
static int watchdog_ioctl_op(struct watchdog_device *wdd, unsigned int cmd,
unsigned long arg)
{
int err;
if (!wdd->ops->ioctl)
return -ENOIOCTLCMD;
mutex_lock(&wdd->lock);
if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_ioctl;
}
err = wdd->ops->ioctl(wdd, cmd, arg);
out_ioctl:
mutex_unlock(&wdd->lock);
return err;
return wdd->ops->ioctl(wdd, cmd, arg);
}
/*
@ -291,10 +364,11 @@ static int watchdog_ioctl_op(struct watchdog_device *wdd, unsigned int cmd,
static ssize_t watchdog_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
struct watchdog_device *wdd = file->private_data;
struct watchdog_core_data *wd_data = file->private_data;
struct watchdog_device *wdd;
int err;
size_t i;
char c;
int err;
if (len == 0)
return 0;
@ -303,18 +377,25 @@ static ssize_t watchdog_write(struct file *file, const char __user *data,
* Note: just in case someone wrote the magic character
* five months ago...
*/
clear_bit(WDOG_ALLOW_RELEASE, &wdd->status);
clear_bit(_WDOG_ALLOW_RELEASE, &wd_data->status);
/* scan to see whether or not we got the magic character */
for (i = 0; i != len; i++) {
if (get_user(c, data + i))
return -EFAULT;
if (c == 'V')
set_bit(WDOG_ALLOW_RELEASE, &wdd->status);
set_bit(_WDOG_ALLOW_RELEASE, &wd_data->status);
}
/* someone wrote to us, so we send the watchdog a keepalive ping */
err = watchdog_ping(wdd);
err = -ENODEV;
mutex_lock(&wd_data->lock);
wdd = wd_data->wdd;
if (wdd)
err = watchdog_ping(wdd);
mutex_unlock(&wd_data->lock);
if (err < 0)
return err;
@ -334,71 +415,94 @@ static ssize_t watchdog_write(struct file *file, const char __user *data,
static long watchdog_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct watchdog_device *wdd = file->private_data;
struct watchdog_core_data *wd_data = file->private_data;
void __user *argp = (void __user *)arg;
struct watchdog_device *wdd;
int __user *p = argp;
unsigned int val;
int err;
mutex_lock(&wd_data->lock);
wdd = wd_data->wdd;
if (!wdd) {
err = -ENODEV;
goto out_ioctl;
}
err = watchdog_ioctl_op(wdd, cmd, arg);
if (err != -ENOIOCTLCMD)
return err;
goto out_ioctl;
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, wdd->info,
err = copy_to_user(argp, wdd->info,
sizeof(struct watchdog_info)) ? -EFAULT : 0;
break;
case WDIOC_GETSTATUS:
err = watchdog_get_status(wdd, &val);
if (err == -ENODEV)
return err;
return put_user(val, p);
val = watchdog_get_status(wdd);
err = put_user(val, p);
break;
case WDIOC_GETBOOTSTATUS:
return put_user(wdd->bootstatus, p);
err = put_user(wdd->bootstatus, p);
break;
case WDIOC_SETOPTIONS:
if (get_user(val, p))
return -EFAULT;
if (get_user(val, p)) {
err = -EFAULT;
break;
}
if (val & WDIOS_DISABLECARD) {
err = watchdog_stop(wdd);
if (err < 0)
return err;
break;
}
if (val & WDIOS_ENABLECARD) {
if (val & WDIOS_ENABLECARD)
err = watchdog_start(wdd);
if (err < 0)
return err;
}
return 0;
break;
case WDIOC_KEEPALIVE:
if (!(wdd->info->options & WDIOF_KEEPALIVEPING))
return -EOPNOTSUPP;
return watchdog_ping(wdd);
if (!(wdd->info->options & WDIOF_KEEPALIVEPING)) {
err = -EOPNOTSUPP;
break;
}
err = watchdog_ping(wdd);
break;
case WDIOC_SETTIMEOUT:
if (get_user(val, p))
return -EFAULT;
if (get_user(val, p)) {
err = -EFAULT;
break;
}
err = watchdog_set_timeout(wdd, val);
if (err < 0)
return err;
break;
/* If the watchdog is active then we send a keepalive ping
* to make sure that the watchdog keep's running (and if
* possible that it takes the new timeout) */
err = watchdog_ping(wdd);
if (err < 0)
return err;
break;
/* Fall */
case WDIOC_GETTIMEOUT:
/* timeout == 0 means that we don't know the timeout */
if (wdd->timeout == 0)
return -EOPNOTSUPP;
return put_user(wdd->timeout, p);
if (wdd->timeout == 0) {
err = -EOPNOTSUPP;
break;
}
err = put_user(wdd->timeout, p);
break;
case WDIOC_GETTIMELEFT:
err = watchdog_get_timeleft(wdd, &val);
if (err)
return err;
return put_user(val, p);
if (err < 0)
break;
err = put_user(val, p);
break;
default:
return -ENOTTY;
err = -ENOTTY;
break;
}
out_ioctl:
mutex_unlock(&wd_data->lock);
return err;
}
/*
@ -413,45 +517,59 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
static int watchdog_open(struct inode *inode, struct file *file)
{
int err = -EBUSY;
struct watchdog_core_data *wd_data;
struct watchdog_device *wdd;
int err;
/* Get the corresponding watchdog device */
if (imajor(inode) == MISC_MAJOR)
wdd = old_wdd;
wd_data = old_wd_data;
else
wdd = container_of(inode->i_cdev, struct watchdog_device, cdev);
wd_data = container_of(inode->i_cdev, struct watchdog_core_data,
cdev);
/* the watchdog is single open! */
if (test_and_set_bit(WDOG_DEV_OPEN, &wdd->status))
if (test_and_set_bit(_WDOG_DEV_OPEN, &wd_data->status))
return -EBUSY;
wdd = wd_data->wdd;
/*
* If the /dev/watchdog device is open, we don't want the module
* to be unloaded.
*/
if (!try_module_get(wdd->ops->owner))
goto out;
if (!try_module_get(wdd->ops->owner)) {
err = -EBUSY;
goto out_clear;
}
err = watchdog_start(wdd);
if (err < 0)
goto out_mod;
file->private_data = wdd;
file->private_data = wd_data;
if (wdd->ops->ref)
wdd->ops->ref(wdd);
kref_get(&wd_data->kref);
/* dev/watchdog is a virtual (and thus non-seekable) filesystem */
return nonseekable_open(inode, file);
out_mod:
module_put(wdd->ops->owner);
out:
clear_bit(WDOG_DEV_OPEN, &wdd->status);
module_put(wd_data->wdd->ops->owner);
out_clear:
clear_bit(_WDOG_DEV_OPEN, &wd_data->status);
return err;
}
static void watchdog_core_data_release(struct kref *kref)
{
struct watchdog_core_data *wd_data;
wd_data = container_of(kref, struct watchdog_core_data, kref);
kfree(wd_data);
}
/*
* watchdog_release: release the watchdog device.
* @inode: inode of device
@ -464,9 +582,16 @@ static int watchdog_open(struct inode *inode, struct file *file)
static int watchdog_release(struct inode *inode, struct file *file)
{
struct watchdog_device *wdd = file->private_data;
struct watchdog_core_data *wd_data = file->private_data;
struct watchdog_device *wdd;
int err = -EBUSY;
mutex_lock(&wd_data->lock);
wdd = wd_data->wdd;
if (!wdd)
goto done;
/*
* We only stop the watchdog if we received the magic character
* or if WDIOF_MAGICCLOSE is not set. If nowayout was set then
@ -474,29 +599,24 @@ static int watchdog_release(struct inode *inode, struct file *file)
*/
if (!test_bit(WDOG_ACTIVE, &wdd->status))
err = 0;
else if (test_and_clear_bit(WDOG_ALLOW_RELEASE, &wdd->status) ||
else if (test_and_clear_bit(_WDOG_ALLOW_RELEASE, &wd_data->status) ||
!(wdd->info->options & WDIOF_MAGICCLOSE))
err = watchdog_stop(wdd);
/* If the watchdog was not stopped, send a keepalive ping */
if (err < 0) {
mutex_lock(&wdd->lock);
if (!test_bit(WDOG_UNREGISTERED, &wdd->status))
dev_crit(wdd->dev, "watchdog did not stop!\n");
mutex_unlock(&wdd->lock);
pr_crit("watchdog%d: watchdog did not stop!\n", wdd->id);
watchdog_ping(wdd);
}
/* Allow the owner module to be unloaded again */
module_put(wdd->ops->owner);
/* make sure that /dev/watchdog can be re-opened */
clear_bit(WDOG_DEV_OPEN, &wdd->status);
/* Note wdd may be gone after this, do not use after this! */
if (wdd->ops->unref)
wdd->ops->unref(wdd);
clear_bit(_WDOG_DEV_OPEN, &wd_data->status);
done:
mutex_unlock(&wd_data->lock);
/* Allow the owner module to be unloaded again */
module_put(wd_data->cdev.owner);
kref_put(&wd_data->kref, watchdog_core_data_release);
return 0;
}
@ -514,6 +634,96 @@ static struct miscdevice watchdog_miscdev = {
.fops = &watchdog_fops,
};
/*
* watchdog_cdev_register: register watchdog character device
* @wdd: watchdog device
* @devno: character device number
*
* Register a watchdog character device including handling the legacy
* /dev/watchdog node. /dev/watchdog is actually a miscdevice and
* thus we set it up like that.
*/
static int watchdog_cdev_register(struct watchdog_device *wdd, dev_t devno)
{
struct watchdog_core_data *wd_data;
int err;
wd_data = kzalloc(sizeof(struct watchdog_core_data), GFP_KERNEL);
if (!wd_data)
return -ENOMEM;
kref_init(&wd_data->kref);
mutex_init(&wd_data->lock);
wd_data->wdd = wdd;
wdd->wd_data = wd_data;
if (wdd->id == 0) {
old_wd_data = wd_data;
watchdog_miscdev.parent = wdd->parent;
err = misc_register(&watchdog_miscdev);
if (err != 0) {
pr_err("%s: cannot register miscdev on minor=%d (err=%d).\n",
wdd->info->identity, WATCHDOG_MINOR, err);
if (err == -EBUSY)
pr_err("%s: a legacy watchdog module is probably present.\n",
wdd->info->identity);
old_wd_data = NULL;
kfree(wd_data);
return err;
}
}
/* Fill in the data structures */
cdev_init(&wd_data->cdev, &watchdog_fops);
wd_data->cdev.owner = wdd->ops->owner;
/* Add the device */
err = cdev_add(&wd_data->cdev, devno, 1);
if (err) {
pr_err("watchdog%d unable to add device %d:%d\n",
wdd->id, MAJOR(watchdog_devt), wdd->id);
if (wdd->id == 0) {
misc_deregister(&watchdog_miscdev);
old_wd_data = NULL;
kref_put(&wd_data->kref, watchdog_core_data_release);
}
}
return err;
}
/*
* watchdog_cdev_unregister: unregister watchdog character device
* @watchdog: watchdog device
*
* Unregister watchdog character device and if needed the legacy
* /dev/watchdog device.
*/
static void watchdog_cdev_unregister(struct watchdog_device *wdd)
{
struct watchdog_core_data *wd_data = wdd->wd_data;
cdev_del(&wd_data->cdev);
if (wdd->id == 0) {
misc_deregister(&watchdog_miscdev);
old_wd_data = NULL;
}
mutex_lock(&wd_data->lock);
wd_data->wdd = NULL;
wdd->wd_data = NULL;
mutex_unlock(&wd_data->lock);
kref_put(&wd_data->kref, watchdog_core_data_release);
}
static struct class watchdog_class = {
.name = "watchdog",
.owner = THIS_MODULE,
.dev_groups = wdt_groups,
};
/*
* watchdog_dev_register: register a watchdog device
* @wdd: watchdog device
@ -525,60 +735,39 @@ static struct miscdevice watchdog_miscdev = {
int watchdog_dev_register(struct watchdog_device *wdd)
{
int err, devno;
struct device *dev;
dev_t devno;
int ret;
if (wdd->id == 0) {
old_wdd = wdd;
watchdog_miscdev.parent = wdd->parent;
err = misc_register(&watchdog_miscdev);
if (err != 0) {
pr_err("%s: cannot register miscdev on minor=%d (err=%d).\n",
wdd->info->identity, WATCHDOG_MINOR, err);
if (err == -EBUSY)
pr_err("%s: a legacy watchdog module is probably present.\n",
wdd->info->identity);
old_wdd = NULL;
return err;
}
}
/* Fill in the data structures */
devno = MKDEV(MAJOR(watchdog_devt), wdd->id);
cdev_init(&wdd->cdev, &watchdog_fops);
wdd->cdev.owner = wdd->ops->owner;
/* Add the device */
err = cdev_add(&wdd->cdev, devno, 1);
if (err) {
pr_err("watchdog%d unable to add device %d:%d\n",
wdd->id, MAJOR(watchdog_devt), wdd->id);
if (wdd->id == 0) {
misc_deregister(&watchdog_miscdev);
old_wdd = NULL;
}
ret = watchdog_cdev_register(wdd, devno);
if (ret)
return ret;
dev = device_create_with_groups(&watchdog_class, wdd->parent,
devno, wdd, wdd->groups,
"watchdog%d", wdd->id);
if (IS_ERR(dev)) {
watchdog_cdev_unregister(wdd);
return PTR_ERR(dev);
}
return err;
return ret;
}
/*
* watchdog_dev_unregister: unregister a watchdog device
* @watchdog: watchdog device
*
* Unregister the watchdog and if needed the legacy /dev/watchdog device.
* Unregister watchdog device and if needed the legacy
* /dev/watchdog device.
*/
int watchdog_dev_unregister(struct watchdog_device *wdd)
void watchdog_dev_unregister(struct watchdog_device *wdd)
{
mutex_lock(&wdd->lock);
set_bit(WDOG_UNREGISTERED, &wdd->status);
mutex_unlock(&wdd->lock);
cdev_del(&wdd->cdev);
if (wdd->id == 0) {
misc_deregister(&watchdog_miscdev);
old_wdd = NULL;
}
return 0;
device_destroy(&watchdog_class, wdd->wd_data->cdev.dev);
watchdog_cdev_unregister(wdd);
}
/*
@ -589,10 +778,22 @@ int watchdog_dev_unregister(struct watchdog_device *wdd)
int __init watchdog_dev_init(void)
{
int err = alloc_chrdev_region(&watchdog_devt, 0, MAX_DOGS, "watchdog");
if (err < 0)
int err;
err = class_register(&watchdog_class);
if (err < 0) {
pr_err("couldn't register class\n");
return err;
}
err = alloc_chrdev_region(&watchdog_devt, 0, MAX_DOGS, "watchdog");
if (err < 0) {
pr_err("watchdog: unable to allocate char dev region\n");
return err;
class_unregister(&watchdog_class);
return err;
}
return 0;
}
/*
@ -604,4 +805,5 @@ int __init watchdog_dev_init(void)
void __exit watchdog_dev_exit(void)
{
unregister_chrdev_region(watchdog_devt, MAX_DOGS);
class_unregister(&watchdog_class);
}

367
drivers/watchdog/ziirave_wdt.c Normal file
View File

@ -0,0 +1,367 @@
/*
* Copyright (C) 2015 Zodiac Inflight Innovations
*
* Author: Martyn Welch <martyn.welch@collabora.co.uk>
*
* Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>:
*
* Copyright (C) Nokia Corporation
*
* 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/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/watchdog.h>
#define ZIIRAVE_TIMEOUT_MIN 3
#define ZIIRAVE_TIMEOUT_MAX 255
#define ZIIRAVE_PING_VALUE 0x0
#define ZIIRAVE_STATE_INITIAL 0x0
#define ZIIRAVE_STATE_OFF 0x1
#define ZIIRAVE_STATE_ON 0x2
static char *ziirave_reasons[] = {"power cycle", "triggered", NULL, NULL,
"host request", NULL, "illegal configuration",
"illegal instruction", "illegal trap",
"unknown"};
#define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1
#define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3
#define ZIIRAVE_WDT_RESET_REASON 0x5
#define ZIIRAVE_WDT_STATE 0x6
#define ZIIRAVE_WDT_TIMEOUT 0x7
#define ZIIRAVE_WDT_TIME_LEFT 0x8
#define ZIIRAVE_WDT_PING 0x9
#define ZIIRAVE_WDT_RESET_DURATION 0xa
struct ziirave_wdt_rev {
unsigned char major;
unsigned char minor;
};
struct ziirave_wdt_data {
struct watchdog_device wdd;
struct ziirave_wdt_rev bootloader_rev;
struct ziirave_wdt_rev firmware_rev;
int reset_reason;
};
static int wdt_timeout;
module_param(wdt_timeout, int, 0);
MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds");
static int reset_duration;
module_param(reset_duration, int, 0);
MODULE_PARM_DESC(reset_duration,
"Watchdog reset pulse duration in milliseconds");
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 int ziirave_wdt_revision(struct i2c_client *client,
struct ziirave_wdt_rev *rev, u8 command)
{
int ret;
ret = i2c_smbus_read_byte_data(client, command);
if (ret < 0)
return ret;
rev->major = ret;
ret = i2c_smbus_read_byte_data(client, command + 1);
if (ret < 0)
return ret;
rev->minor = ret;
return 0;
}
static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state)
{
struct i2c_client *client = to_i2c_client(wdd->parent);
return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, state);
}
static int ziirave_wdt_start(struct watchdog_device *wdd)
{
return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON);
}
static int ziirave_wdt_stop(struct watchdog_device *wdd)
{
return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF);
}
static int ziirave_wdt_ping(struct watchdog_device *wdd)
{
struct i2c_client *client = to_i2c_client(wdd->parent);
return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING,
ZIIRAVE_PING_VALUE);
}
static int ziirave_wdt_set_timeout(struct watchdog_device *wdd,
unsigned int timeout)
{
struct i2c_client *client = to_i2c_client(wdd->parent);
int ret;
ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, timeout);
if (!ret)
wdd->timeout = timeout;
return ret;
}
static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd)
{
struct i2c_client *client = to_i2c_client(wdd->parent);
int ret;
ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT);
if (ret < 0)
ret = 0;
return ret;
}
static const struct watchdog_info ziirave_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
.identity = "Zodiac RAVE Watchdog",
};
static const struct watchdog_ops ziirave_wdt_ops = {
.owner = THIS_MODULE,
.start = ziirave_wdt_start,
.stop = ziirave_wdt_stop,
.ping = ziirave_wdt_ping,
.set_timeout = ziirave_wdt_set_timeout,
.get_timeleft = ziirave_wdt_get_timeleft,
};
static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev->parent);
struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
return sprintf(buf, "02.%02u.%02u", w_priv->firmware_rev.major,
w_priv->firmware_rev.minor);
}
static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm,
NULL);
static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev->parent);
struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
return sprintf(buf, "01.%02u.%02u", w_priv->bootloader_rev.major,
w_priv->bootloader_rev.minor);
}
static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot,
NULL);
static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev->parent);
struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
return sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);
}
static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason,
NULL);
static struct attribute *ziirave_wdt_attrs[] = {
&dev_attr_firmware_version.attr,
&dev_attr_bootloader_version.attr,
&dev_attr_reset_reason.attr,
NULL
};
ATTRIBUTE_GROUPS(ziirave_wdt);
static int ziirave_wdt_init_duration(struct i2c_client *client)
{
int ret;
if (!reset_duration) {
/* See if the reset pulse duration is provided in an of_node */
if (!client->dev.of_node)
ret = -ENODEV;
else
ret = of_property_read_u32(client->dev.of_node,
"reset-duration-ms",
&reset_duration);
if (ret) {
dev_info(&client->dev,
"Unable to set reset pulse duration, using default\n");
return 0;
}
}
if (reset_duration < 1 || reset_duration > 255)
return -EINVAL;
dev_info(&client->dev, "Setting reset duration to %dms",
reset_duration);
return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION,
reset_duration);
}
static int ziirave_wdt_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct ziirave_wdt_data *w_priv;
int val;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL);
if (!w_priv)
return -ENOMEM;
w_priv->wdd.info = &ziirave_wdt_info;
w_priv->wdd.ops = &ziirave_wdt_ops;
w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN;
w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX;
w_priv->wdd.parent = &client->dev;
w_priv->wdd.groups = ziirave_wdt_groups;
ret = watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev);
if (ret) {
dev_info(&client->dev,
"Unable to select timeout value, using default\n");
}
/*
* The default value set in the watchdog should be perfectly valid, so
* pass that in if we haven't provided one via the module parameter or
* of property.
*/
if (w_priv->wdd.timeout == 0) {
val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT);
if (val < 0)
return val;
if (val < ZIIRAVE_TIMEOUT_MIN)
return -ENODEV;
w_priv->wdd.timeout = val;
} else {
ret = ziirave_wdt_set_timeout(&w_priv->wdd,
w_priv->wdd.timeout);
if (ret)
return ret;
dev_info(&client->dev, "Timeout set to %ds.",
w_priv->wdd.timeout);
}
watchdog_set_nowayout(&w_priv->wdd, nowayout);
i2c_set_clientdata(client, w_priv);
/* If in unconfigured state, set to stopped */
val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE);
if (val < 0)
return val;
if (val == ZIIRAVE_STATE_INITIAL)
ziirave_wdt_stop(&w_priv->wdd);
ret = ziirave_wdt_init_duration(client);
if (ret)
return ret;
ret = ziirave_wdt_revision(client, &w_priv->firmware_rev,
ZIIRAVE_WDT_FIRM_VER_MAJOR);
if (ret)
return ret;
ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev,
ZIIRAVE_WDT_BOOT_VER_MAJOR);
if (ret)
return ret;
w_priv->reset_reason = i2c_smbus_read_byte_data(client,
ZIIRAVE_WDT_RESET_REASON);
if (w_priv->reset_reason < 0)
return w_priv->reset_reason;
if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) ||
!ziirave_reasons[w_priv->reset_reason])
return -ENODEV;
ret = watchdog_register_device(&w_priv->wdd);
return ret;
}
static int ziirave_wdt_remove(struct i2c_client *client)
{
struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
watchdog_unregister_device(&w_priv->wdd);
return 0;
}
static struct i2c_device_id ziirave_wdt_id[] = {
{ "ziirave-wdt", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id);
static const struct of_device_id zrv_wdt_of_match[] = {
{ .compatible = "zii,rave-wdt", },
{ },
};
MODULE_DEVICE_TABLE(of, zrv_wdt_of_match);
static struct i2c_driver ziirave_wdt_driver = {
.driver = {
.name = "ziirave_wdt",
.of_match_table = zrv_wdt_of_match,
},
.probe = ziirave_wdt_probe,
.remove = ziirave_wdt_remove,
.id_table = ziirave_wdt_id,
};
module_i2c_driver(ziirave_wdt_driver);
MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk");
MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver");
MODULE_LICENSE("GPL");

3
include/linux/bcm47xx_wdt.h
View File

@ -1,7 +1,6 @@
#ifndef LINUX_BCM47XX_WDT_H_
#define LINUX_BCM47XX_WDT_H_
#include <linux/notifier.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/watchdog.h>
@ -15,8 +14,6 @@ struct bcm47xx_wdt {
void *driver_data;
struct watchdog_device wdd;
struct notifier_block notifier;
struct notifier_block restart_handler;
struct timer_list soft_timer;
atomic_t soft_ticks;

38
include/linux/watchdog.h
View File

@ -12,10 +12,12 @@
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/notifier.h>
#include <uapi/linux/watchdog.h>
struct watchdog_ops;
struct watchdog_device;
struct watchdog_core_data;
/** struct watchdog_ops - The watchdog-devices operations
*
@ -26,8 +28,7 @@ struct watchdog_device;
* @status: The routine that shows the status of the watchdog device.
* @set_timeout:The routine for setting the watchdog devices timeout value (in seconds).
* @get_timeleft:The routine that gets the time left before a reset (in seconds).
* @ref: The ref operation for dyn. allocated watchdog_device structs
* @unref: The unref operation for dyn. allocated watchdog_device structs
* @restart: The routine for restarting the machine.
* @ioctl: The routines that handles extra ioctl calls.
*
* The watchdog_ops structure contains a list of low-level operations
@ -45,25 +46,26 @@ struct watchdog_ops {
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
unsigned int (*get_timeleft)(struct watchdog_device *);
void (*ref)(struct watchdog_device *);
void (*unref)(struct watchdog_device *);
int (*restart)(struct watchdog_device *);
long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
};
/** struct watchdog_device - The structure that defines a watchdog device
*
* @id: The watchdog's ID. (Allocated by watchdog_register_device)
* @cdev: The watchdog's Character device.
* @dev: The device for our watchdog
* @parent: The parent bus device
* @groups: List of sysfs attribute groups to create when creating the
* watchdog device.
* @info: Pointer to a watchdog_info structure.
* @ops: Pointer to the list of watchdog operations.
* @bootstatus: Status of the watchdog device at boot.
* @timeout: The watchdog devices timeout value (in seconds).
* @min_timeout:The watchdog devices minimum timeout value (in seconds).
* @max_timeout:The watchdog devices maximum timeout value (in seconds).
* @driver-data:Pointer to the drivers private data.
* @lock: Lock for watchdog core internal use only.
* @reboot_nb: The notifier block to stop watchdog on reboot.
* @restart_nb: The notifier block to register a restart function.
* @driver_data:Pointer to the drivers private data.
* @wd_data: Pointer to watchdog core internal data.
* @status: Field that contains the devices internal status bits.
* @deferred: entry in wtd_deferred_reg_list which is used to
* register early initialized watchdogs.
@ -79,24 +81,23 @@ struct watchdog_ops {
*/
struct watchdog_device {
int id;
struct cdev cdev;
struct device *dev;
struct device *parent;
const struct attribute_group **groups;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
unsigned int bootstatus;
unsigned int timeout;
unsigned int min_timeout;
unsigned int max_timeout;
struct notifier_block reboot_nb;
struct notifier_block restart_nb;
void *driver_data;
struct mutex lock;
struct watchdog_core_data *wd_data;
unsigned long status;
/* Bit numbers for status flags */
#define WDOG_ACTIVE 0 /* Is the watchdog running/active */
#define WDOG_DEV_OPEN 1 /* Opened via /dev/watchdog ? */
#define WDOG_ALLOW_RELEASE 2 /* Did we receive the magic char ? */
#define WDOG_NO_WAY_OUT 3 /* Is 'nowayout' feature set ? */
#define WDOG_UNREGISTERED 4 /* Has the device been unregistered */
#define WDOG_NO_WAY_OUT 1 /* Is 'nowayout' feature set ? */
#define WDOG_STOP_ON_REBOOT 2 /* Should be stopped on reboot */
struct list_head deferred;
};
@ -116,6 +117,12 @@ static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool noway
set_bit(WDOG_NO_WAY_OUT, &wdd->status);
}
/* Use the following function to stop the watchdog on reboot */
static inline void watchdog_stop_on_reboot(struct watchdog_device *wdd)
{
set_bit(WDOG_STOP_ON_REBOOT, &wdd->status);
}
/* Use the following function to check if a timeout value is invalid */
static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t)
{
@ -142,6 +149,7 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
}
/* drivers/watchdog/watchdog_core.c */
void watchdog_set_restart_priority(struct watchdog_device *wdd, int priority);
extern int watchdog_init_timeout(struct watchdog_device *wdd,
unsigned int timeout_parm, struct device *dev);
extern int watchdog_register_device(struct watchdog_device *);