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authorLinus Torvalds <torvalds@linux-foundation.org>2016-01-17 12:15:38 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-17 12:15:38 -0800
commit6606b342febfd470b4a33acb73e360eeaca1d9bb (patch)
tree2414cc2ca582aa34be6e6ed5c830658fbf21db41
parenta016af2e70bfca23f2f5de7d8708157b86ea374d (diff)
parentac36856fe4321454b6789c019c96c3ec854094ed (diff)
Merge git://www.linux-watchdog.org/linux-watchdog
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 ...
-rw-r--r--Documentation/ABI/testing/sysfs-class-watchdog51
-rw-r--r--Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt35
-rw-r--r--Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt12
-rw-r--r--Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt18
-rw-r--r--Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt25
-rw-r--r--Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt19
-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt77
-rw-r--r--MAINTAINERS1
-rw-r--r--drivers/hwmon/sch56xx-common.c31
-rw-r--r--drivers/watchdog/Kconfig65
-rw-r--r--drivers/watchdog/Makefile6
-rw-r--r--drivers/watchdog/asm9260_wdt.c403
-rw-r--r--drivers/watchdog/atlas7_wdt.c242
-rw-r--r--drivers/watchdog/bcm2835_wdt.c1
-rw-r--r--drivers/watchdog/bcm47xx_wdt.c55
-rw-r--r--drivers/watchdog/cadence_wdt.c42
-rw-r--r--drivers/watchdog/da9052_wdt.c24
-rw-r--r--drivers/watchdog/da9055_wdt.c24
-rw-r--r--drivers/watchdog/da9063_wdt.c23
-rw-r--r--drivers/watchdog/diag288_wdt.c26
-rw-r--r--drivers/watchdog/digicolor_wdt.c18
-rw-r--r--drivers/watchdog/dw_wdt.c2
-rw-r--r--drivers/watchdog/gpio_wdt.c38
-rw-r--r--drivers/watchdog/hpwdt.c12
-rw-r--r--drivers/watchdog/imgpdc_wdt.c34
-rw-r--r--drivers/watchdog/imx2_wdt.c23
-rw-r--r--drivers/watchdog/lpc18xx_wdt.c52
-rw-r--r--drivers/watchdog/mena21_wdt.c4
-rw-r--r--drivers/watchdog/meson_wdt.c88
-rw-r--r--drivers/watchdog/moxart_wdt.c23
-rw-r--r--drivers/watchdog/mt7621_wdt.c186
-rw-r--r--drivers/watchdog/mtk_wdt.c22
-rw-r--r--drivers/watchdog/omap_wdt.c7
-rw-r--r--drivers/watchdog/qcom-wdt.c50
-rw-r--r--drivers/watchdog/s3c2410_wdt.c60
-rw-r--r--drivers/watchdog/softdog.c38
-rw-r--r--drivers/watchdog/sp5100_tco.c32
-rw-r--r--drivers/watchdog/stmp3xxx_rtc_wdt.c25
-rw-r--r--drivers/watchdog/sunxi_wdt.c23
-rw-r--r--drivers/watchdog/tangox_wdt.c225
-rw-r--r--drivers/watchdog/ts4800_wdt.c215
-rw-r--r--drivers/watchdog/w83627hf_wdt.c32
-rw-r--r--drivers/watchdog/watchdog_core.c115
-rw-r--r--drivers/watchdog/watchdog_core.h2
-rw-r--r--drivers/watchdog/watchdog_dev.c572
-rw-r--r--drivers/watchdog/ziirave_wdt.c367
-rw-r--r--include/linux/bcm47xx_wdt.h3
-rw-r--r--include/linux/watchdog.h38
48 files changed, 2671 insertions, 815 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-watchdog b/Documentation/ABI/testing/sysfs-class-watchdog
new file mode 100644
index 000000000000..736046b33040
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-watchdog
@@ -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.
diff --git a/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt b/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt
new file mode 100644
index 000000000000..75b265a04047
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/alphascale-asm9260.txt
@@ -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";
+};
diff --git a/Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt b/Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt
new file mode 100644
index 000000000000..c15ef0ef609f
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/mt7621-wdt.txt
@@ -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>;
+ };
diff --git a/Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt b/Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt
new file mode 100644
index 000000000000..5b7ec2c707d8
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt
@@ -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>;
+};
diff --git a/Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt b/Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt
new file mode 100644
index 000000000000..8f6caad4258d
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt
@@ -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>;
+ };
+}
diff --git a/Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt b/Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt
new file mode 100644
index 000000000000..3d878184ec3f
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/ziirave-wdt.txt
@@ -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>;
+ };
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index d8b0d3367706..55120a055a14 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -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
diff --git a/MAINTAINERS b/MAINTAINERS
index 04d62b1e8b17..11073db4c0a0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -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
diff --git a/drivers/hwmon/sch56xx-common.c b/drivers/hwmon/sch56xx-common.c
index 738681983284..68c350c704fb 100644
--- a/drivers/hwmon/sch56xx-common.c
+++ b/drivers/hwmon/sch56xx-common.c
@@ -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);
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 1c427beffadd..4f0e7be0da34 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -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
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 53d4827ddfe1..f566753256ab 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -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
diff --git a/drivers/watchdog/asm9260_wdt.c b/drivers/watchdog/asm9260_wdt.c
new file mode 100644
index 000000000000..c9686b2fdafd
--- /dev/null
+++ b/drivers/watchdog/asm9260_wdt.c
@@ -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");
diff --git a/drivers/watchdog/atlas7_wdt.c b/drivers/watchdog/atlas7_wdt.c
new file mode 100644
index 000000000000..df6d9242a319
--- /dev/null
+++ b/drivers/watchdog/atlas7_wdt.c
@@ -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");
diff --git a/drivers/watchdog/bcm2835_wdt.c b/drivers/watchdog/bcm2835_wdt.c
index 8a5ce5b5a0b6..2e6164c4abc0 100644
--- a/drivers/watchdog/bcm2835_wdt.c
+++ b/drivers/watchdog/bcm2835_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c
index 4064a43f1360..df1c2a4b0165 100644
--- a/drivers/watchdog/bcm47xx_wdt.c
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/cadence_wdt.c b/drivers/watchdog/cadence_wdt.c
index bcfd2a22208f..4dda9024e229 100644
--- a/drivers/watchdog/cadence_wdt.c
+++ b/drivers/watchdog/cadence_wdt.c
@@ -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);
diff --git a/drivers/watchdog/da9052_wdt.c b/drivers/watchdog/da9052_wdt.c
index 67e67977bd29..2fc19a32a320 100644
--- a/drivers/watchdog/da9052_wdt.c
+++ b/drivers/watchdog/da9052_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/da9055_wdt.c b/drivers/watchdog/da9055_wdt.c
index 04d1430d93d2..8377c43f3f20 100644
--- a/drivers/watchdog/da9055_wdt.c
+++ b/drivers/watchdog/da9055_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/da9063_wdt.c b/drivers/watchdog/da9063_wdt.c
index 6bf130bd863d..11e887572649 100644
--- a/drivers/watchdog/da9063_wdt.c
+++ b/drivers/watchdog/da9063_wdt.c
@@ -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;
diff --git a/drivers/watchdog/diag288_wdt.c b/drivers/watchdog/diag288_wdt.c
index 3db9d0e0673d..861d3d3133f8 100644
--- a/drivers/watchdog/diag288_wdt.c
+++ b/drivers/watchdog/diag288_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/digicolor_wdt.c b/drivers/watchdog/digicolor_wdt.c
index 50abe1bf62a5..1ccb0b239348 100644
--- a/drivers/watchdog/digicolor_wdt.c
+++ b/drivers/watchdog/digicolor_wdt.c
@@ -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);
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 6ea0634345e9..8fefa4ad46d4 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -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)
diff --git a/drivers/watchdog/gpio_wdt.c b/drivers/watchdog/gpio_wdt.c
index 90d59d3f38a3..ba066e4a707b 100644
--- a/drivers/watchdog/gpio_wdt.c
+++ b/drivers/watchdog/gpio_wdt.c
@@ -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;
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 286369d4f0f5..92443c319e59 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -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;
diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c
index 15ab07230960..3679f2e1922f 100644
--- a/drivers/watchdog/imgpdc_wdt.c
+++ b/drivers/watchdog/imgpdc_wdt.c
@@ -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);
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 29ef719a6a3c..e47966aa2db0 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -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)) {
diff --git a/drivers/watchdog/lpc18xx_wdt.c b/drivers/watchdog/lpc18xx_wdt.c
index ab7b8b185d99..6914c83aa6d9 100644
--- a/drivers/watchdog/lpc18xx_wdt.c
+++ b/drivers/watchdog/lpc18xx_wdt.c
@@ -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);
diff --git a/drivers/watchdog/mena21_wdt.c b/drivers/watchdog/mena21_wdt.c
index 098fa9c34d6d..af6a7c489f08 100644
--- a/drivers/watchdog/mena21_wdt.c
+++ b/drivers/watchdog/mena21_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/meson_wdt.c b/drivers/watchdog/meson_wdt.c
index 1f4155ee3404..aea5d2f44ad7 100644
--- a/drivers/watchdog/meson_wdt.c
+++ b/drivers/watchdog/meson_wdt.c
@@ -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,
diff --git a/drivers/watchdog/moxart_wdt.c b/drivers/watchdog/moxart_wdt.c
index 60b0605bd7e6..885c81bc4210 100644
--- a/drivers/watchdog/moxart_wdt.c
+++ b/drivers/watchdog/moxart_wdt.c
@@ -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;
diff --git a/drivers/watchdog/mt7621_wdt.c b/drivers/watchdog/mt7621_wdt.c
new file mode 100644
index 000000000000..4a2290f900a8
--- /dev/null
+++ b/drivers/watchdog/mt7621_wdt.c
@@ -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");
diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index b751f43d76ed..b78776c05554 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -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;
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index 6f17c935a6cf..1b02bfa81b29 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 773dcfaee7b2..424f9a952fee 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -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;
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index d781000c7825..0093450441fe 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -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;
diff --git a/drivers/watchdog/softdog.c b/drivers/watchdog/softdog.c
index 0dc5e323d59d..99a06f9e3930 100644
--- a/drivers/watchdog/softdog.c
+++ b/drivers/watchdog/softdog.c
@@ -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;
}
@@ -122,26 +125,9 @@ static int softdog_set_timeout(struct watchdog_device *w, unsigned int t)
}
/*
- * 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);
diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index eb8044ef0ea0..6467b91f2245 100644
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -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? */
diff --git a/drivers/watchdog/stmp3xxx_rtc_wdt.c b/drivers/watchdog/stmp3xxx_rtc_wdt.c
index 3ee6128a540e..d8b11eb269ad 100644
--- a/drivers/watchdog/stmp3xxx_rtc_wdt.c
+++ b/drivers/watchdog/stmp3xxx_rtc_wdt.c
@@ -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;
}
diff --git a/drivers/watchdog/sunxi_wdt.c b/drivers/watchdog/sunxi_wdt.c
index 47bd8a14d01f..e027deb54740 100644
--- a/drivers/watchdog/sunxi_wdt.c
+++ b/drivers/watchdog/sunxi_wdt.c
@@ -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);
diff --git a/drivers/watchdog/tangox_wdt.c b/drivers/watchdog/tangox_wdt.c
new file mode 100644
index 000000000000..709c1ed6fd79
--- /dev/null
+++ b/drivers/watchdog/tangox_wdt.c
@@ -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");
diff --git a/drivers/watchdog/ts4800_wdt.c b/drivers/watchdog/ts4800_wdt.c
new file mode 100644
index 000000000000..2b8de8602b67
--- /dev/null
+++ b/drivers/watchdog/ts4800_wdt.c
@@ -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");
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 5824e25eebbb..cab14bc9106c 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -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>
@@ -288,18 +286,6 @@ static unsigned int wdt_get_time(struct watchdog_device *wdog)
}
/*
- * 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);
diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 873f13972cf4..e600fd93b7de 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -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);
}
diff --git a/drivers/watchdog/watchdog_core.h b/drivers/watchdog/watchdog_core.h
index 6c951418fca7..86ff962d1e15 100644
--- a/drivers/watchdog/watchdog_core.h
+++ b/drivers/watchdog/watchdog_core.h
@@ -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);
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 56a649e66eb2..ba2ecce4aae6 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -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 @@ out_ping:
* 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 @@ out_ping:
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 @@ out_start:
* 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 @@ out_start:
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;
-
- mutex_lock(&wdd->lock);
-
- if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
- err = -ENODEV;
- goto out_status;
- }
-
- *status = wdd->ops->status(wdd);
+ return 0;
-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 @@ out_timeout:
* @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);
+ *timeleft = wdd->ops->get_timeleft(wdd);
- if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
- err = -ENODEV;
- goto out_timeleft;
- }
+ return 0;
+}
- *timeleft = wdd->ops->get_timeleft(wdd);
+#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);
-out_timeleft:
- mutex_unlock(&wdd->lock);
- return err;
+ 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 @@ out_ioctl:
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 @@ out:
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;
}
@@ -515,20 +635,31 @@ static struct miscdevice watchdog_miscdev = {
};
/*
- * watchdog_dev_register: register a watchdog device
+ * watchdog_cdev_register: register watchdog character device
* @wdd: watchdog device
+ * @devno: character device number
*
- * Register a watchdog device including handling the legacy
+ * 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.
*/
-int watchdog_dev_register(struct watchdog_device *wdd)
+static int watchdog_cdev_register(struct watchdog_device *wdd, dev_t devno)
{
- int err, 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_wdd = wdd;
+ old_wd_data = wd_data;
watchdog_miscdev.parent = wdd->parent;
err = misc_register(&watchdog_miscdev);
if (err != 0) {
@@ -537,48 +668,106 @@ int watchdog_dev_register(struct watchdog_device *wdd)
if (err == -EBUSY)
pr_err("%s: a legacy watchdog module is probably present.\n",
wdd->info->identity);
- old_wdd = NULL;
+ old_wd_data = NULL;
+ kfree(wd_data);
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;
+ cdev_init(&wd_data->cdev, &watchdog_fops);
+ wd_data->cdev.owner = wdd->ops->owner;
/* Add the device */
- err = cdev_add(&wdd->cdev, devno, 1);
+ 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_wdd = NULL;
+ old_wd_data = NULL;
+ kref_put(&wd_data->kref, watchdog_core_data_release);
}
}
return err;
}
/*
- * watchdog_dev_unregister: unregister a watchdog device
+ * watchdog_cdev_unregister: unregister watchdog character device
* @watchdog: watchdog device
*
- * Unregister the watchdog and if needed the legacy /dev/watchdog device.
+ * Unregister watchdog character device and if needed the legacy
+ * /dev/watchdog device.
*/
-int watchdog_dev_unregister(struct watchdog_device *wdd)
+static void watchdog_cdev_unregister(struct watchdog_device *wdd)
{
- mutex_lock(&wdd->lock);
- set_bit(WDOG_UNREGISTERED, &wdd->status);
- mutex_unlock(&wdd->lock);
+ struct watchdog_core_data *wd_data = wdd->wd_data;
- cdev_del(&wdd->cdev);
+ cdev_del(&wd_data->cdev);
if (wdd->id == 0) {
misc_deregister(&watchdog_miscdev);
- old_wdd = NULL;
+ old_wd_data = NULL;
}
- return 0;
+
+ 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
+ *
+ * Register a watchdog device including handling the legacy
+ * /dev/watchdog node. /dev/watchdog is actually a miscdevice and
+ * thus we set it up like that.
+ */
+
+int watchdog_dev_register(struct watchdog_device *wdd)
+{
+ struct device *dev;
+ dev_t devno;
+ int ret;
+
+ devno = MKDEV(MAJOR(watchdog_devt), wdd->id);
+
+ 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 ret;
+}
+
+/*
+ * watchdog_dev_unregister: unregister a watchdog device
+ * @watchdog: watchdog device
+ *
+ * Unregister watchdog device and if needed the legacy
+ * /dev/watchdog device.
+ */
+
+void watchdog_dev_unregister(struct watchdog_device *wdd)
+{
+ 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);
}
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
new file mode 100644
index 000000000000..0c7cb7302cf0
--- /dev/null
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -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");
diff --git a/include/linux/bcm47xx_wdt.h b/include/linux/bcm47xx_wdt.h
index 5582c211f594..8d9d07ec22a5 100644
--- a/include/linux/bcm47xx_wdt.h
+++ b/include/linux/bcm47xx_wdt.h
@@ -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;
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 027b1f43f12d..b585fa2507ee 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -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 *);