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authorLinus Torvalds <torvalds@linux-foundation.org>2016-10-13 23:44:20 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-13 23:44:20 (GMT)
commite3799a210d794fda0fa2ae99841d30cadf76069c (patch)
treeb292d7e4e740d09c8c3c86b493a34b31f4b5822a
parentb67be92feb486f800d80d72c67fd87b47b79b18e (diff)
parent39487f6688a557ebfc69816d7e02f210bf8fb2a3 (diff)
downloadlinux-e3799a210d794fda0fa2ae99841d30cadf76069c.tar.xz
Merge git://www.linux-watchdog.org/linux-watchdog
Pull watchdog updates from Wim Van Sebroeck: - a new watchdog pretimeout governor framework - support to upload the firmware on the ziirave_wdt - several fixes and cleanups * git://www.linux-watchdog.org/linux-watchdog: (26 commits) watchdog: imx2_wdt: add pretimeout function support watchdog: softdog: implement pretimeout support watchdog: pretimeout: add pretimeout_available_governors attribute watchdog: pretimeout: add option to select a pretimeout governor in runtime watchdog: pretimeout: add panic pretimeout governor watchdog: pretimeout: add noop pretimeout governor watchdog: add watchdog pretimeout governor framework watchdog: hpwdt: add support for iLO5 fs: compat_ioctl: add pretimeout functions for watchdogs watchdog: add pretimeout support to the core watchdog: imx2_wdt: use preferred BIT macro instead of open coded values watchdog: st_wdt: Remove support for obsolete platforms watchdog: bindings: Remove obsolete platforms from dt doc. watchdog: mt7621_wdt: Remove assignment of dev pointer watchdog: rt2880_wdt: Remove assignment of dev pointer watchdog: constify watchdog_ops structures watchdog: tegra: constify watchdog_ops structures watchdog: iTCO_wdt: constify iTCO_wdt_pm structure watchdog: cadence_wdt: Fix the suspend resume watchdog: txx9wdt: Add missing clock (un)prepare calls for CCF ...
-rw-r--r--Documentation/devicetree/bindings/watchdog/of-xilinx-wdt.txt3
-rw-r--r--Documentation/devicetree/bindings/watchdog/st_lpc_wdt.txt3
-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt33
-rw-r--r--drivers/watchdog/Kconfig49
-rw-r--r--drivers/watchdog/Makefile8
-rw-r--r--drivers/watchdog/asm9260_wdt.c1
-rw-r--r--drivers/watchdog/bcm7038_wdt.c2
-rw-r--r--drivers/watchdog/cadence_wdt.c20
-rw-r--r--drivers/watchdog/dw_wdt.c11
-rw-r--r--drivers/watchdog/hpwdt.c8
-rw-r--r--drivers/watchdog/iTCO_wdt.c2
-rw-r--r--drivers/watchdog/imx2_wdt.c60
-rw-r--r--drivers/watchdog/kempld_wdt.c2
-rw-r--r--drivers/watchdog/mt7621_wdt.c1
-rw-r--r--drivers/watchdog/of_xilinx_wdt.c25
-rw-r--r--drivers/watchdog/pretimeout_noop.c47
-rw-r--r--drivers/watchdog/pretimeout_panic.c47
-rw-r--r--drivers/watchdog/rn5t618_wdt.c2
-rw-r--r--drivers/watchdog/rt2880_wdt.c1
-rw-r--r--drivers/watchdog/softdog.c24
-rw-r--r--drivers/watchdog/st_lpc_wdt.c33
-rw-r--r--drivers/watchdog/tegra_wdt.c2
-rw-r--r--drivers/watchdog/txx9wdt.c6
-rw-r--r--drivers/watchdog/w83627hf_wdt.c2
-rw-r--r--drivers/watchdog/watchdog_core.c2
-rw-r--r--drivers/watchdog/watchdog_dev.c101
-rw-r--r--drivers/watchdog/watchdog_pretimeout.c220
-rw-r--r--drivers/watchdog/watchdog_pretimeout.h60
-rw-r--r--drivers/watchdog/ziirave_wdt.c409
-rw-r--r--fs/compat_ioctl.c2
-rw-r--r--include/linux/watchdog.h24
31 files changed, 1131 insertions, 79 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/of-xilinx-wdt.txt b/Documentation/devicetree/bindings/watchdog/of-xilinx-wdt.txt
index 6d63782..c6ae9c9 100644
--- a/Documentation/devicetree/bindings/watchdog/of-xilinx-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/of-xilinx-wdt.txt
@@ -7,6 +7,8 @@ Required properties:
- reg : Physical base address and size
Optional properties:
+- clocks : Input clock specifier. Refer to common clock
+ bindings.
- clock-frequency : Frequency of clock in Hz
- xlnx,wdt-enable-once : 0 - Watchdog can be restarted
1 - Watchdog can be enabled just once
@@ -17,6 +19,7 @@ Example:
axi-timebase-wdt@40100000 {
clock-frequency = <50000000>;
compatible = "xlnx,xps-timebase-wdt-1.00.a";
+ clocks = <&clkc 15>;
reg = <0x40100000 0x10000>;
xlnx,wdt-enable-once = <0x0>;
xlnx,wdt-interval = <0x1b>;
diff --git a/Documentation/devicetree/bindings/watchdog/st_lpc_wdt.txt b/Documentation/devicetree/bindings/watchdog/st_lpc_wdt.txt
index 039c5ca..b949039 100644
--- a/Documentation/devicetree/bindings/watchdog/st_lpc_wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/st_lpc_wdt.txt
@@ -9,8 +9,7 @@ functionality.
Required properties
-- compatible : Must be one of: "st,stih407-lpc" "st,stih416-lpc"
- "st,stih415-lpc" "st,stid127-lpc"
+- compatible : Should be: "st,stih407-lpc"
- reg : LPC registers base address + size
- interrupts : LPC interrupt line number and associated flags
- clocks : Clock used by LPC device (See: ../clock/clock-bindings.txt)
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 7f31125..ea27747 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -48,8 +48,10 @@ struct watchdog_device {
const struct attribute_group **groups;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
+ const struct watchdog_governor *gov;
unsigned int bootstatus;
unsigned int timeout;
+ unsigned int pretimeout;
unsigned int min_timeout;
unsigned int max_timeout;
unsigned int min_hw_heartbeat_ms;
@@ -74,9 +76,11 @@ It contains following fields:
* 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.
+* gov: a pointer to the assigned watchdog device pretimeout governor or NULL.
* timeout: the watchdog timer's timeout value (in seconds).
This is the time after which the system will reboot if user space does
not send a heartbeat request if WDOG_ACTIVE is set.
+* pretimeout: the watchdog timer's pretimeout value (in seconds).
* min_timeout: the watchdog timer's minimum timeout value (in seconds).
If set, the minimum configurable value for 'timeout'.
* max_timeout: the watchdog timer's maximum timeout value (in seconds),
@@ -121,6 +125,7 @@ struct watchdog_ops {
int (*ping)(struct watchdog_device *);
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
+ int (*set_pretimeout)(struct watchdog_device *, unsigned int);
unsigned int (*get_timeleft)(struct watchdog_device *);
int (*restart)(struct watchdog_device *);
void (*ref)(struct watchdog_device *) __deprecated;
@@ -188,6 +193,23 @@ they are supported. These optional routines/operations are:
If set_timeout is not provided but, WDIOF_SETTIMEOUT is set, the watchdog
infrastructure updates the timeout value of the watchdog_device internally
to the requested value.
+ If the pretimeout feature is used (WDIOF_PRETIMEOUT), then set_timeout must
+ also take care of checking if pretimeout is still valid and set up the timer
+ accordingly. This can't be done in the core without races, so it is the
+ duty of the driver.
+* set_pretimeout: this routine checks and changes the pretimeout value of
+ the watchdog. It is optional because not all watchdogs support pretimeout
+ notification. The timeout value is not an absolute time, but the number of
+ seconds before the actual timeout would happen. It returns 0 on success,
+ -EINVAL for "parameter out of range" and -EIO for "could not write value to
+ the watchdog". A value of 0 disables pretimeout notification.
+ (Note: the WDIOF_PRETIMEOUT needs to be set in the options field of the
+ watchdog's info structure).
+ If the watchdog driver does not have to perform any action but setting the
+ watchdog_device.pretimeout, this callback can be omitted. That means if
+ set_pretimeout is not provided but WDIOF_PRETIMEOUT is set, the watchdog
+ infrastructure updates the pretimeout value of the watchdog_device internally
+ to the requested value.
* get_timeleft: this routines returns the time that's left before a reset.
* restart: this routine restarts the machine. It returns 0 on success or a
negative errno code for failure.
@@ -268,3 +290,14 @@ User should follow the following guidelines for setting the priority:
* 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
+
+To raise a pretimeout notification, the following function should be used:
+
+void watchdog_notify_pretimeout(struct watchdog_device *wdd)
+
+The function can be called in the interrupt context. If watchdog pretimeout
+governor framework (kbuild CONFIG_WATCHDOG_PRETIMEOUT_GOV symbol) is enabled,
+an action is taken by a preconfigured pretimeout governor preassigned to
+the watchdog device. If watchdog pretimeout governor framework is not
+enabled, watchdog_notify_pretimeout() prints a notification message to
+the kernel log buffer.
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 50dbaa8..fdd3228 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1844,4 +1844,53 @@ config USBPCWATCHDOG
Most people will say N.
+comment "Watchdog Pretimeout Governors"
+
+config WATCHDOG_PRETIMEOUT_GOV
+ bool "Enable watchdog pretimeout governors"
+ help
+ The option allows to select watchdog pretimeout governors.
+
+if WATCHDOG_PRETIMEOUT_GOV
+
+choice
+ prompt "Default Watchdog Pretimeout Governor"
+ default WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
+ help
+ This option selects a default watchdog pretimeout governor.
+ The governor takes its action, if a watchdog is capable
+ to report a pretimeout event.
+
+config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP
+ bool "noop"
+ select WATCHDOG_PRETIMEOUT_GOV_NOOP
+ help
+ Use noop watchdog pretimeout governor by default. If noop
+ governor is selected by a user, write a short message to
+ the kernel log buffer and don't do any system changes.
+
+config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC
+ bool "panic"
+ select WATCHDOG_PRETIMEOUT_GOV_PANIC
+ help
+ Use panic watchdog pretimeout governor by default, if
+ a watchdog pretimeout event happens, consider that
+ a watchdog feeder is dead and reboot is unavoidable.
+
+endchoice
+
+config WATCHDOG_PRETIMEOUT_GOV_NOOP
+ tristate "Noop watchdog pretimeout governor"
+ help
+ Noop watchdog pretimeout governor, only an informational
+ message is added to kernel log buffer.
+
+config WATCHDOG_PRETIMEOUT_GOV_PANIC
+ tristate "Panic watchdog pretimeout governor"
+ help
+ Panic watchdog pretimeout governor, on watchdog pretimeout
+ event put the kernel into panic.
+
+endif # WATCHDOG_PRETIMEOUT_GOV
+
endif # WATCHDOG
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index cba0043..caa9f4a 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -3,9 +3,15 @@
#
# The WatchDog Timer Driver Core.
-watchdog-objs += watchdog_core.o watchdog_dev.o
obj-$(CONFIG_WATCHDOG_CORE) += watchdog.o
+watchdog-objs += watchdog_core.o watchdog_dev.o
+
+watchdog-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV) += watchdog_pretimeout.o
+
+obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_NOOP) += pretimeout_noop.o
+obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_PANIC) += pretimeout_panic.o
+
# Only one watchdog can succeed. We probe the ISA/PCI/USB based
# watchdog-cards first, then the architecture specific watchdog
# drivers and then the architecture independent "softdog" driver.
diff --git a/drivers/watchdog/asm9260_wdt.c b/drivers/watchdog/asm9260_wdt.c
index c9686b2..d0b59ba 100644
--- a/drivers/watchdog/asm9260_wdt.c
+++ b/drivers/watchdog/asm9260_wdt.c
@@ -389,7 +389,6 @@ 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,
diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
index 4245b65..e238df4 100644
--- a/drivers/watchdog/bcm7038_wdt.c
+++ b/drivers/watchdog/bcm7038_wdt.c
@@ -107,7 +107,7 @@ static struct watchdog_info bcm7038_wdt_info = {
WDIOF_MAGICCLOSE
};
-static struct watchdog_ops bcm7038_wdt_ops = {
+static const struct watchdog_ops bcm7038_wdt_ops = {
.owner = THIS_MODULE,
.start = bcm7038_wdt_start,
.stop = bcm7038_wdt_stop,
diff --git a/drivers/watchdog/cadence_wdt.c b/drivers/watchdog/cadence_wdt.c
index 4dda902..98acef7 100644
--- a/drivers/watchdog/cadence_wdt.c
+++ b/drivers/watchdog/cadence_wdt.c
@@ -269,7 +269,7 @@ static struct watchdog_info cdns_wdt_info = {
};
/* Watchdog Core Ops */
-static struct watchdog_ops cdns_wdt_ops = {
+static const struct watchdog_ops cdns_wdt_ops = {
.owner = THIS_MODULE,
.start = cdns_wdt_start,
.stop = cdns_wdt_stop,
@@ -424,8 +424,10 @@ static int __maybe_unused cdns_wdt_suspend(struct 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);
- clk_disable_unprepare(wdt->clk);
+ if (watchdog_active(&wdt->cdns_wdt_device)) {
+ cdns_wdt_stop(&wdt->cdns_wdt_device);
+ clk_disable_unprepare(wdt->clk);
+ }
return 0;
}
@@ -442,12 +444,14 @@ static int __maybe_unused cdns_wdt_resume(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct cdns_wdt *wdt = platform_get_drvdata(pdev);
- ret = clk_prepare_enable(wdt->clk);
- if (ret) {
- dev_err(dev, "unable to enable clock\n");
- return ret;
+ if (watchdog_active(&wdt->cdns_wdt_device)) {
+ ret = clk_prepare_enable(wdt->clk);
+ if (ret) {
+ dev_err(dev, "unable to enable clock\n");
+ return ret;
+ }
+ cdns_wdt_start(&wdt->cdns_wdt_device);
}
- cdns_wdt_start(&wdt->cdns_wdt_device);
return 0;
}
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 2acb51c..3c6a3de 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -54,6 +54,7 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
struct dw_wdt {
void __iomem *regs;
struct clk *clk;
+ unsigned long rate;
struct notifier_block restart_handler;
struct watchdog_device wdd;
};
@@ -72,7 +73,7 @@ static inline int dw_wdt_top_in_seconds(struct dw_wdt *dw_wdt, 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 (1U << (16 + top)) / clk_get_rate(dw_wdt->clk);
+ return (1U << (16 + top)) / dw_wdt->rate;
}
static int dw_wdt_get_top(struct dw_wdt *dw_wdt)
@@ -163,7 +164,7 @@ static unsigned int dw_wdt_get_timeleft(struct watchdog_device *wdd)
struct dw_wdt *dw_wdt = to_dw_wdt(wdd);
return readl(dw_wdt->regs + WDOG_CURRENT_COUNT_REG_OFFSET) /
- clk_get_rate(dw_wdt->clk);
+ dw_wdt->rate;
}
static const struct watchdog_info dw_wdt_ident = {
@@ -231,6 +232,12 @@ static int dw_wdt_drv_probe(struct platform_device *pdev)
if (ret)
return ret;
+ dw_wdt->rate = clk_get_rate(dw_wdt->clk);
+ if (dw_wdt->rate == 0) {
+ ret = -EINVAL;
+ goto out_disable_clk;
+ }
+
wdd = &dw_wdt->wdd;
wdd->info = &dw_wdt_ident;
wdd->ops = &dw_wdt_ops;
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 8f89bd8..70c7194 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -39,7 +39,7 @@
#include <asm/nmi.h>
#include <asm/frame.h>
-#define HPWDT_VERSION "1.3.3"
+#define HPWDT_VERSION "1.4.0"
#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
@@ -814,7 +814,8 @@ static int hpwdt_init_one(struct pci_dev *dev,
* not run on a legacy ASM box.
* So we only support the G5 ProLiant servers and higher.
*/
- if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
+ if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
+ dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
dev_warn(&dev->dev,
"This server does not have an iLO2+ ASIC.\n");
return -ENODEV;
@@ -823,7 +824,8 @@ static int hpwdt_init_one(struct pci_dev *dev,
/*
* Ignore all auxilary iLO devices with the following PCI ID
*/
- if (dev->subsystem_device == 0x1979)
+ if (dev->subsystem_vendor == PCI_VENDOR_ID_HP &&
+ dev->subsystem_device == 0x1979)
return -ENODEV;
if (pci_enable_device(dev)) {
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
index 54cab18..06fcb6c 100644
--- a/drivers/watchdog/iTCO_wdt.c
+++ b/drivers/watchdog/iTCO_wdt.c
@@ -629,7 +629,7 @@ static int iTCO_wdt_resume_noirq(struct device *dev)
return 0;
}
-static struct dev_pm_ops iTCO_wdt_pm = {
+static const struct dev_pm_ops iTCO_wdt_pm = {
.suspend_noirq = iTCO_wdt_suspend_noirq,
.resume_noirq = iTCO_wdt_resume_noirq,
};
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 62f346b..4874b0f 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -24,6 +24,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -37,18 +38,23 @@
#define IMX2_WDT_WCR 0x00 /* Control Register */
#define IMX2_WDT_WCR_WT (0xFF << 8) /* -> Watchdog Timeout Field */
-#define IMX2_WDT_WCR_WDA (1 << 5) /* -> External Reset WDOG_B */
-#define IMX2_WDT_WCR_SRS (1 << 4) /* -> Software Reset Signal */
-#define IMX2_WDT_WCR_WRE (1 << 3) /* -> WDOG Reset Enable */
-#define IMX2_WDT_WCR_WDE (1 << 2) /* -> Watchdog Enable */
-#define IMX2_WDT_WCR_WDZST (1 << 0) /* -> Watchdog timer Suspend */
+#define IMX2_WDT_WCR_WDA BIT(5) /* -> External Reset WDOG_B */
+#define IMX2_WDT_WCR_SRS BIT(4) /* -> Software Reset Signal */
+#define IMX2_WDT_WCR_WRE BIT(3) /* -> WDOG Reset Enable */
+#define IMX2_WDT_WCR_WDE BIT(2) /* -> Watchdog Enable */
+#define IMX2_WDT_WCR_WDZST BIT(0) /* -> Watchdog timer Suspend */
#define IMX2_WDT_WSR 0x02 /* Service Register */
#define IMX2_WDT_SEQ1 0x5555 /* -> service sequence 1 */
#define IMX2_WDT_SEQ2 0xAAAA /* -> service sequence 2 */
#define IMX2_WDT_WRSR 0x04 /* Reset Status Register */
-#define IMX2_WDT_WRSR_TOUT (1 << 1) /* -> Reset due to Timeout */
+#define IMX2_WDT_WRSR_TOUT BIT(1) /* -> Reset due to Timeout */
+
+#define IMX2_WDT_WICR 0x06 /* Interrupt Control Register */
+#define IMX2_WDT_WICR_WIE BIT(15) /* -> Interrupt Enable */
+#define IMX2_WDT_WICR_WTIS BIT(14) /* -> Interrupt Status */
+#define IMX2_WDT_WICR_WICT 0xFF /* -> Interrupt Count Timeout */
#define IMX2_WDT_WMCR 0x08 /* Misc Register */
@@ -80,6 +86,12 @@ static const struct watchdog_info imx2_wdt_info = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
};
+static const struct watchdog_info imx2_wdt_pretimeout_info = {
+ .identity = "imx2+ watchdog",
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE |
+ WDIOF_PRETIMEOUT,
+};
+
static int imx2_wdt_restart(struct watchdog_device *wdog, unsigned long action,
void *data)
{
@@ -169,6 +181,35 @@ static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
return 0;
}
+static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog,
+ unsigned int new_pretimeout)
+{
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+
+ if (new_pretimeout >= IMX2_WDT_MAX_TIME)
+ return -EINVAL;
+
+ wdog->pretimeout = new_pretimeout;
+
+ regmap_update_bits(wdev->regmap, IMX2_WDT_WICR,
+ IMX2_WDT_WICR_WIE | IMX2_WDT_WICR_WICT,
+ IMX2_WDT_WICR_WIE | (new_pretimeout << 1));
+ return 0;
+}
+
+static irqreturn_t imx2_wdt_isr(int irq, void *wdog_arg)
+{
+ struct watchdog_device *wdog = wdog_arg;
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+
+ regmap_write_bits(wdev->regmap, IMX2_WDT_WICR,
+ IMX2_WDT_WICR_WTIS, IMX2_WDT_WICR_WTIS);
+
+ watchdog_notify_pretimeout(wdog);
+
+ return IRQ_HANDLED;
+}
+
static int imx2_wdt_start(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
@@ -188,6 +229,7 @@ static const struct watchdog_ops imx2_wdt_ops = {
.start = imx2_wdt_start,
.ping = imx2_wdt_ping,
.set_timeout = imx2_wdt_set_timeout,
+ .set_pretimeout = imx2_wdt_set_pretimeout,
.restart = imx2_wdt_restart,
};
@@ -236,6 +278,12 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
wdog->max_hw_heartbeat_ms = IMX2_WDT_MAX_TIME * 1000;
wdog->parent = &pdev->dev;
+ ret = platform_get_irq(pdev, 0);
+ if (ret > 0)
+ if (!devm_request_irq(&pdev->dev, ret, imx2_wdt_isr, 0,
+ dev_name(&pdev->dev), wdog))
+ wdog->info = &imx2_wdt_pretimeout_info;
+
ret = clk_prepare_enable(wdev->clk);
if (ret)
return ret;
diff --git a/drivers/watchdog/kempld_wdt.c b/drivers/watchdog/kempld_wdt.c
index 5bf931c..8e302d0 100644
--- a/drivers/watchdog/kempld_wdt.c
+++ b/drivers/watchdog/kempld_wdt.c
@@ -430,7 +430,7 @@ static struct watchdog_info kempld_wdt_info = {
WDIOF_PRETIMEOUT
};
-static struct watchdog_ops kempld_wdt_ops = {
+static const struct watchdog_ops kempld_wdt_ops = {
.owner = THIS_MODULE,
.start = kempld_wdt_start,
.stop = kempld_wdt_stop,
diff --git a/drivers/watchdog/mt7621_wdt.c b/drivers/watchdog/mt7621_wdt.c
index 4a2290f..d5735c1 100644
--- a/drivers/watchdog/mt7621_wdt.c
+++ b/drivers/watchdog/mt7621_wdt.c
@@ -139,7 +139,6 @@ static int mt7621_wdt_probe(struct platform_device *pdev)
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,
diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c
index b2e1b4c..fae7fe9 100644
--- a/drivers/watchdog/of_xilinx_wdt.c
+++ b/drivers/watchdog/of_xilinx_wdt.c
@@ -10,6 +10,7 @@
* 2 of the License, or (at your option) any later version.
*/
+#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/types.h>
@@ -45,6 +46,7 @@ struct xwdt_device {
u32 wdt_interval;
spinlock_t spinlock;
struct watchdog_device xilinx_wdt_wdd;
+ struct clk *clk;
};
static int xilinx_wdt_start(struct watchdog_device *wdd)
@@ -195,16 +197,30 @@ static int xwdt_probe(struct platform_device *pdev)
spin_lock_init(&xdev->spinlock);
watchdog_set_drvdata(xilinx_wdt_wdd, xdev);
+ xdev->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(xdev->clk)) {
+ if (PTR_ERR(xdev->clk) == -ENOENT)
+ xdev->clk = NULL;
+ else
+ return PTR_ERR(xdev->clk);
+ }
+
+ rc = clk_prepare_enable(xdev->clk);
+ if (rc) {
+ dev_err(&pdev->dev, "unable to enable clock\n");
+ return rc;
+ }
+
rc = xwdt_selftest(xdev);
if (rc == XWT_TIMER_FAILED) {
dev_err(&pdev->dev, "SelfTest routine error\n");
- return rc;
+ goto err_clk_disable;
}
rc = watchdog_register_device(xilinx_wdt_wdd);
if (rc) {
dev_err(&pdev->dev, "Cannot register watchdog (err=%d)\n", rc);
- return rc;
+ goto err_clk_disable;
}
dev_info(&pdev->dev, "Xilinx Watchdog Timer at %p with timeout %ds\n",
@@ -213,6 +229,10 @@ static int xwdt_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, xdev);
return 0;
+err_clk_disable:
+ clk_disable_unprepare(xdev->clk);
+
+ return rc;
}
static int xwdt_remove(struct platform_device *pdev)
@@ -220,6 +240,7 @@ static int xwdt_remove(struct platform_device *pdev)
struct xwdt_device *xdev = platform_get_drvdata(pdev);
watchdog_unregister_device(&xdev->xilinx_wdt_wdd);
+ clk_disable_unprepare(xdev->clk);
return 0;
}
diff --git a/drivers/watchdog/pretimeout_noop.c b/drivers/watchdog/pretimeout_noop.c
new file mode 100644
index 0000000..85f5299
--- /dev/null
+++ b/drivers/watchdog/pretimeout_noop.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2015-2016 Mentor Graphics
+ *
+ * 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/module.h>
+#include <linux/printk.h>
+#include <linux/watchdog.h>
+
+#include "watchdog_pretimeout.h"
+
+/**
+ * pretimeout_noop - No operation on watchdog pretimeout event
+ * @wdd - watchdog_device
+ *
+ * This function prints a message about pretimeout to kernel log.
+ */
+static void pretimeout_noop(struct watchdog_device *wdd)
+{
+ pr_alert("watchdog%d: pretimeout event\n", wdd->id);
+}
+
+static struct watchdog_governor watchdog_gov_noop = {
+ .name = "noop",
+ .pretimeout = pretimeout_noop,
+};
+
+static int __init watchdog_gov_noop_register(void)
+{
+ return watchdog_register_governor(&watchdog_gov_noop);
+}
+
+static void __exit watchdog_gov_noop_unregister(void)
+{
+ watchdog_unregister_governor(&watchdog_gov_noop);
+}
+module_init(watchdog_gov_noop_register);
+module_exit(watchdog_gov_noop_unregister);
+
+MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>");
+MODULE_DESCRIPTION("Panic watchdog pretimeout governor");
+MODULE_LICENSE("GPL");
diff --git a/drivers/watchdog/pretimeout_panic.c b/drivers/watchdog/pretimeout_panic.c
new file mode 100644
index 0000000..0c197a1
--- /dev/null
+++ b/drivers/watchdog/pretimeout_panic.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2015-2016 Mentor Graphics
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/watchdog.h>
+
+#include "watchdog_pretimeout.h"
+
+/**
+ * pretimeout_panic - Panic on watchdog pretimeout event
+ * @wdd - watchdog_device
+ *
+ * Panic, watchdog has not been fed till pretimeout event.
+ */
+static void pretimeout_panic(struct watchdog_device *wdd)
+{
+ panic("watchdog pretimeout event\n");
+}
+
+static struct watchdog_governor watchdog_gov_panic = {
+ .name = "panic",
+ .pretimeout = pretimeout_panic,
+};
+
+static int __init watchdog_gov_panic_register(void)
+{
+ return watchdog_register_governor(&watchdog_gov_panic);
+}
+
+static void __exit watchdog_gov_panic_unregister(void)
+{
+ watchdog_unregister_governor(&watchdog_gov_panic);
+}
+module_init(watchdog_gov_panic_register);
+module_exit(watchdog_gov_panic_unregister);
+
+MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>");
+MODULE_DESCRIPTION("Panic watchdog pretimeout governor");
+MODULE_LICENSE("GPL");
diff --git a/drivers/watchdog/rn5t618_wdt.c b/drivers/watchdog/rn5t618_wdt.c
index d1c1227..0805ee2 100644
--- a/drivers/watchdog/rn5t618_wdt.c
+++ b/drivers/watchdog/rn5t618_wdt.c
@@ -136,7 +136,7 @@ static struct watchdog_info rn5t618_wdt_info = {
.identity = DRIVER_NAME,
};
-static struct watchdog_ops rn5t618_wdt_ops = {
+static const struct watchdog_ops rn5t618_wdt_ops = {
.owner = THIS_MODULE,
.start = rn5t618_wdt_start,
.stop = rn5t618_wdt_stop,
diff --git a/drivers/watchdog/rt2880_wdt.c b/drivers/watchdog/rt2880_wdt.c
index 1967919..14b4fd4 100644
--- a/drivers/watchdog/rt2880_wdt.c
+++ b/drivers/watchdog/rt2880_wdt.c
@@ -158,7 +158,6 @@ static int rt288x_wdt_probe(struct platform_device *pdev)
rt288x_wdt_freq = clk_get_rate(rt288x_wdt_clk) / RALINK_WDT_PRESCALE;
- rt288x_wdt_dev.dev = &pdev->dev;
rt288x_wdt_dev.bootstatus = rt288x_wdt_bootcause();
rt288x_wdt_dev.max_timeout = (0xfffful / rt288x_wdt_freq);
rt288x_wdt_dev.parent = &pdev->dev;
diff --git a/drivers/watchdog/softdog.c b/drivers/watchdog/softdog.c
index b067edf..c7bdc98 100644
--- a/drivers/watchdog/softdog.c
+++ b/drivers/watchdog/softdog.c
@@ -72,10 +72,27 @@ static void softdog_fire(unsigned long data)
static struct timer_list softdog_ticktock =
TIMER_INITIALIZER(softdog_fire, 0, 0);
+static struct watchdog_device softdog_dev;
+
+static void softdog_pretimeout(unsigned long data)
+{
+ watchdog_notify_pretimeout(&softdog_dev);
+}
+
+static struct timer_list softdog_preticktock =
+ TIMER_INITIALIZER(softdog_pretimeout, 0, 0);
+
static int softdog_ping(struct watchdog_device *w)
{
if (!mod_timer(&softdog_ticktock, jiffies + (w->timeout * HZ)))
__module_get(THIS_MODULE);
+
+ if (w->pretimeout)
+ mod_timer(&softdog_preticktock, jiffies +
+ (w->timeout - w->pretimeout) * HZ);
+ else
+ del_timer(&softdog_preticktock);
+
return 0;
}
@@ -84,15 +101,18 @@ static int softdog_stop(struct watchdog_device *w)
if (del_timer(&softdog_ticktock))
module_put(THIS_MODULE);
+ del_timer(&softdog_preticktock);
+
return 0;
}
static struct watchdog_info softdog_info = {
.identity = "Software Watchdog",
- .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE |
+ WDIOF_PRETIMEOUT,
};
-static struct watchdog_ops softdog_ops = {
+static const struct watchdog_ops softdog_ops = {
.owner = THIS_MODULE,
.start = softdog_ping,
.stop = softdog_stop,
diff --git a/drivers/watchdog/st_lpc_wdt.c b/drivers/watchdog/st_lpc_wdt.c
index 14e9bad..e6100e4 100644
--- a/drivers/watchdog/st_lpc_wdt.c
+++ b/drivers/watchdog/st_lpc_wdt.c
@@ -52,27 +52,6 @@ struct st_wdog {
bool warm_reset;
};
-static struct st_wdog_syscfg stid127_syscfg = {
- .reset_type_reg = 0x004,
- .reset_type_mask = BIT(2),
- .enable_reg = 0x000,
- .enable_mask = BIT(2),
-};
-
-static struct st_wdog_syscfg stih415_syscfg = {
- .reset_type_reg = 0x0B8,
- .reset_type_mask = BIT(6),
- .enable_reg = 0x0B4,
- .enable_mask = BIT(7),
-};
-
-static struct st_wdog_syscfg stih416_syscfg = {
- .reset_type_reg = 0x88C,
- .reset_type_mask = BIT(6),
- .enable_reg = 0x888,
- .enable_mask = BIT(7),
-};
-
static struct st_wdog_syscfg stih407_syscfg = {
.enable_reg = 0x204,
.enable_mask = BIT(19),
@@ -83,18 +62,6 @@ static const struct of_device_id st_wdog_match[] = {
.compatible = "st,stih407-lpc",
.data = &stih407_syscfg,
},
- {
- .compatible = "st,stih416-lpc",
- .data = &stih416_syscfg,
- },
- {
- .compatible = "st,stih415-lpc",
- .data = &stih415_syscfg,
- },
- {
- .compatible = "st,stid127-lpc",
- .data = &stid127_syscfg,
- },
{},
};
MODULE_DEVICE_TABLE(of, st_wdog_match);
diff --git a/drivers/watchdog/tegra_wdt.c b/drivers/watchdog/tegra_wdt.c
index 9ec5760..2d53c3f 100644
--- a/drivers/watchdog/tegra_wdt.c
+++ b/drivers/watchdog/tegra_wdt.c
@@ -178,7 +178,7 @@ static const struct watchdog_info tegra_wdt_info = {
.identity = "Tegra Watchdog",
};
-static struct watchdog_ops tegra_wdt_ops = {
+static const struct watchdog_ops tegra_wdt_ops = {
.owner = THIS_MODULE,
.start = tegra_wdt_start,
.stop = tegra_wdt_stop,
diff --git a/drivers/watchdog/txx9wdt.c b/drivers/watchdog/txx9wdt.c
index c2da880..6f7a9de 100644
--- a/drivers/watchdog/txx9wdt.c
+++ b/drivers/watchdog/txx9wdt.c
@@ -112,7 +112,7 @@ static int __init txx9wdt_probe(struct platform_device *dev)
txx9_imclk = NULL;
goto exit;
}
- ret = clk_enable(txx9_imclk);
+ ret = clk_prepare_enable(txx9_imclk);
if (ret) {
clk_put(txx9_imclk);
txx9_imclk = NULL;
@@ -144,7 +144,7 @@ static int __init txx9wdt_probe(struct platform_device *dev)
return 0;
exit:
if (txx9_imclk) {
- clk_disable(txx9_imclk);
+ clk_disable_unprepare(txx9_imclk);
clk_put(txx9_imclk);
}
return ret;
@@ -153,7 +153,7 @@ exit:
static int __exit txx9wdt_remove(struct platform_device *dev)
{
watchdog_unregister_device(&txx9wdt);
- clk_disable(txx9_imclk);
+ clk_disable_unprepare(txx9_imclk);
clk_put(txx9_imclk);
return 0;
}
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 09e8003..ef2ecaf 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -302,7 +302,7 @@ static struct watchdog_info wdt_info = {
.identity = "W83627HF Watchdog",
};
-static struct watchdog_ops wdt_ops = {
+static const struct watchdog_ops wdt_ops = {
.owner = THIS_MODULE,
.start = wdt_start,
.stop = wdt_stop,
diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 6abb83c..74265b2 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -349,7 +349,7 @@ int devm_watchdog_register_device(struct device *dev,
struct watchdog_device **rcwdd;
int ret;
- rcwdd = devres_alloc(devm_watchdog_unregister_device, sizeof(*wdd),
+ rcwdd = devres_alloc(devm_watchdog_unregister_device, sizeof(*rcwdd),
GFP_KERNEL);
if (!rcwdd)
return -ENOMEM;
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 040bf83..32930a0 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -49,6 +49,7 @@
#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
#include "watchdog_core.h"
+#include "watchdog_pretimeout.h"
/*
* struct watchdog_core_data - watchdog core internal data
@@ -335,10 +336,14 @@ static int watchdog_set_timeout(struct watchdog_device *wdd,
if (watchdog_timeout_invalid(wdd, timeout))
return -EINVAL;
- if (wdd->ops->set_timeout)
+ if (wdd->ops->set_timeout) {
err = wdd->ops->set_timeout(wdd, timeout);
- else
+ } else {
wdd->timeout = timeout;
+ /* Disable pretimeout if it doesn't fit the new timeout */
+ if (wdd->pretimeout >= wdd->timeout)
+ wdd->pretimeout = 0;
+ }
watchdog_update_worker(wdd);
@@ -346,6 +351,31 @@ static int watchdog_set_timeout(struct watchdog_device *wdd,
}
/*
+ * watchdog_set_pretimeout: set the watchdog timer pretimeout
+ * @wdd: the watchdog device to set the timeout for
+ * @timeout: pretimeout to set in seconds
+ */
+
+static int watchdog_set_pretimeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ int err = 0;
+
+ if (!(wdd->info->options & WDIOF_PRETIMEOUT))
+ return -EOPNOTSUPP;
+
+ if (watchdog_pretimeout_invalid(wdd, timeout))
+ return -EINVAL;
+
+ if (wdd->ops->set_pretimeout)
+ err = wdd->ops->set_pretimeout(wdd, timeout);
+ else
+ wdd->pretimeout = timeout;
+
+ return err;
+}
+
+/*
* watchdog_get_timeleft: wrapper to get the time left before a reboot
* @wdd: the watchdog device to get the remaining time from
* @timeleft: the time that's left
@@ -429,6 +459,15 @@ static ssize_t timeout_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(timeout);
+static ssize_t pretimeout_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", wdd->pretimeout);
+}
+static DEVICE_ATTR_RO(pretimeout);
+
static ssize_t identity_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -450,6 +489,36 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(state);
+static ssize_t pretimeout_available_governors_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return watchdog_pretimeout_available_governors_get(buf);
+}
+static DEVICE_ATTR_RO(pretimeout_available_governors);
+
+static ssize_t pretimeout_governor_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+
+ return watchdog_pretimeout_governor_get(wdd, buf);
+}
+
+static ssize_t pretimeout_governor_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct watchdog_device *wdd = dev_get_drvdata(dev);
+ int ret = watchdog_pretimeout_governor_set(wdd, buf);
+
+ if (!ret)
+ ret = count;
+
+ return ret;
+}
+static DEVICE_ATTR_RW(pretimeout_governor);
+
static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
int n)
{
@@ -459,6 +528,14 @@ static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr,
if (attr == &dev_attr_timeleft.attr && !wdd->ops->get_timeleft)
mode = 0;
+ else if (attr == &dev_attr_pretimeout.attr &&
+ !(wdd->info->options & WDIOF_PRETIMEOUT))
+ mode = 0;
+ else if ((attr == &dev_attr_pretimeout_governor.attr ||
+ attr == &dev_attr_pretimeout_available_governors.attr) &&
+ (!(wdd->info->options & WDIOF_PRETIMEOUT) ||
+ !IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)))
+ mode = 0;
return mode;
}
@@ -466,10 +543,13 @@ static struct attribute *wdt_attrs[] = {
&dev_attr_state.attr,
&dev_attr_identity.attr,
&dev_attr_timeout.attr,
+ &dev_attr_pretimeout.attr,
&dev_attr_timeleft.attr,
&dev_attr_bootstatus.attr,
&dev_attr_status.attr,
&dev_attr_nowayout.attr,
+ &dev_attr_pretimeout_governor.attr,
+ &dev_attr_pretimeout_available_governors.attr,
NULL,
};
@@ -646,6 +726,16 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
break;
err = put_user(val, p);
break;
+ case WDIOC_SETPRETIMEOUT:
+ if (get_user(val, p)) {
+ err = -EFAULT;
+ break;
+ }
+ err = watchdog_set_pretimeout(wdd, val);
+ break;
+ case WDIOC_GETPRETIMEOUT:
+ err = put_user(wdd->pretimeout, p);
+ break;
default:
err = -ENOTTY;
break;
@@ -937,6 +1027,12 @@ int watchdog_dev_register(struct watchdog_device *wdd)
return PTR_ERR(dev);
}
+ ret = watchdog_register_pretimeout(wdd);
+ if (ret) {
+ device_destroy(&watchdog_class, devno);
+ watchdog_cdev_unregister(wdd);
+ }
+
return ret;
}
@@ -950,6 +1046,7 @@ int watchdog_dev_register(struct watchdog_device *wdd)
void watchdog_dev_unregister(struct watchdog_device *wdd)
{
+ watchdog_unregister_pretimeout(wdd);
device_destroy(&watchdog_class, wdd->wd_data->cdev.dev);
watchdog_cdev_unregister(wdd);
}
diff --git a/drivers/watchdog/watchdog_pretimeout.c b/drivers/watchdog/watchdog_pretimeout.c
new file mode 100644
index 0000000..9db07bf
--- /dev/null
+++ b/drivers/watchdog/watchdog_pretimeout.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2015-2016 Mentor Graphics
+ *
+ * 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/list.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/watchdog.h>
+
+#include "watchdog_pretimeout.h"
+
+/* Default watchdog pretimeout governor */
+static struct watchdog_governor *default_gov;
+
+/* The spinlock protects default_gov, wdd->gov and pretimeout_list */
+static DEFINE_SPINLOCK(pretimeout_lock);
+
+/* List of watchdog devices, which can generate a pretimeout event */
+static LIST_HEAD(pretimeout_list);
+
+struct watchdog_pretimeout {
+ struct watchdog_device *wdd;
+ struct list_head entry;
+};
+
+/* The mutex protects governor list and serializes external interfaces */
+static DEFINE_MUTEX(governor_lock);
+
+/* List of the registered watchdog pretimeout governors */
+static LIST_HEAD(governor_list);
+
+struct governor_priv {
+ struct watchdog_governor *gov;
+ struct list_head entry;
+};
+
+static struct governor_priv *find_governor_by_name(const char *gov_name)
+{
+ struct governor_priv *priv;
+
+ list_for_each_entry(priv, &governor_list, entry)
+ if (sysfs_streq(gov_name, priv->gov->name))
+ return priv;
+
+ return NULL;
+}
+
+int watchdog_pretimeout_available_governors_get(char *buf)
+{
+ struct governor_priv *priv;
+ int count = 0;
+
+ mutex_lock(&governor_lock);
+
+ list_for_each_entry(priv, &governor_list, entry)
+ count += sprintf(buf + count, "%s\n", priv->gov->name);
+
+ mutex_unlock(&governor_lock);
+
+ return count;
+}
+
+int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf)
+{
+ int count = 0;
+
+ spin_lock_irq(&pretimeout_lock);
+ if (wdd->gov)
+ count = sprintf(buf, "%s\n", wdd->gov->name);
+ spin_unlock_irq(&pretimeout_lock);
+
+ return count;
+}
+
+int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
+ const char *buf)
+{
+ struct governor_priv *priv;
+
+ mutex_lock(&governor_lock);
+
+ priv = find_governor_by_name(buf);
+ if (!priv) {
+ mutex_unlock(&governor_lock);
+ return -EINVAL;
+ }
+
+ spin_lock_irq(&pretimeout_lock);
+ wdd->gov = priv->gov;
+ spin_unlock_irq(&pretimeout_lock);
+
+ mutex_unlock(&governor_lock);
+
+ return 0;
+}
+
+void watchdog_notify_pretimeout(struct watchdog_device *wdd)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&pretimeout_lock, flags);
+ if (!wdd->gov) {
+ spin_unlock_irqrestore(&pretimeout_lock, flags);
+ return;
+ }
+
+ wdd->gov->pretimeout(wdd);
+ spin_unlock_irqrestore(&pretimeout_lock, flags);
+}
+EXPORT_SYMBOL_GPL(watchdog_notify_pretimeout);
+
+int watchdog_register_governor(struct watchdog_governor *gov)
+{
+ struct watchdog_pretimeout *p;
+ struct governor_priv *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ mutex_lock(&governor_lock);
+
+ if (find_governor_by_name(gov->name)) {
+ mutex_unlock(&governor_lock);
+ kfree(priv);
+ return -EBUSY;
+ }
+
+ priv->gov = gov;
+ list_add(&priv->entry, &governor_list);
+
+ if (!strncmp(gov->name, WATCHDOG_PRETIMEOUT_DEFAULT_GOV,
+ WATCHDOG_GOV_NAME_MAXLEN)) {
+ spin_lock_irq(&pretimeout_lock);
+ default_gov = gov;
+
+ list_for_each_entry(p, &pretimeout_list, entry)
+ if (!p->wdd->gov)
+ p->wdd->gov = default_gov;
+ spin_unlock_irq(&pretimeout_lock);
+ }
+
+ mutex_unlock(&governor_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(watchdog_register_governor);
+
+void watchdog_unregister_governor(struct watchdog_governor *gov)
+{
+ struct watchdog_pretimeout *p;
+ struct governor_priv *priv, *t;
+
+ mutex_lock(&governor_lock);
+
+ list_for_each_entry_safe(priv, t, &governor_list, entry) {
+ if (priv->gov == gov) {
+ list_del(&priv->entry);
+ kfree(priv);
+ break;
+ }
+ }
+
+ spin_lock_irq(&pretimeout_lock);
+ list_for_each_entry(p, &pretimeout_list, entry)
+ if (p->wdd->gov == gov)
+ p->wdd->gov = default_gov;
+ spin_unlock_irq(&pretimeout_lock);
+
+ mutex_unlock(&governor_lock);
+}
+EXPORT_SYMBOL(watchdog_unregister_governor);
+
+int watchdog_register_pretimeout(struct watchdog_device *wdd)
+{
+ struct watchdog_pretimeout *p;
+
+ if (!(wdd->info->options & WDIOF_PRETIMEOUT))
+ return 0;
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ spin_lock_irq(&pretimeout_lock);
+ list_add(&p->entry, &pretimeout_list);
+ p->wdd = wdd;
+ wdd->gov = default_gov;
+ spin_unlock_irq(&pretimeout_lock);
+
+ return 0;
+}
+
+void watchdog_unregister_pretimeout(struct watchdog_device *wdd)
+{
+ struct watchdog_pretimeout *p, *t;
+
+ if (!(wdd->info->options & WDIOF_PRETIMEOUT))
+ return;
+
+ spin_lock_irq(&pretimeout_lock);
+ wdd->gov = NULL;
+
+ list_for_each_entry_safe(p, t, &pretimeout_list, entry) {
+ if (p->wdd == wdd) {
+ list_del(&p->entry);
+ break;
+ }
+ }
+ spin_unlock_irq(&pretimeout_lock);
+
+ kfree(p);
+}
diff --git a/drivers/watchdog/watchdog_pretimeout.h b/drivers/watchdog/watchdog_pretimeout.h
new file mode 100644
index 0000000..a5a32b3
--- /dev/null
+++ b/drivers/watchdog/watchdog_pretimeout.h
@@ -0,0 +1,60 @@
+#ifndef __WATCHDOG_PRETIMEOUT_H
+#define __WATCHDOG_PRETIMEOUT_H
+
+#define WATCHDOG_GOV_NAME_MAXLEN 20
+
+struct watchdog_device;
+
+struct watchdog_governor {
+ const char name[WATCHDOG_GOV_NAME_MAXLEN];
+ void (*pretimeout)(struct watchdog_device *wdd);
+};
+
+#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)
+/* Interfaces to watchdog pretimeout governors */
+int watchdog_register_governor(struct watchdog_governor *gov);
+void watchdog_unregister_governor(struct watchdog_governor *gov);
+
+/* Interfaces to watchdog_dev.c */
+int watchdog_register_pretimeout(struct watchdog_device *wdd);
+void watchdog_unregister_pretimeout(struct watchdog_device *wdd);
+int watchdog_pretimeout_available_governors_get(char *buf);
+int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf);
+int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
+ const char *buf);
+
+#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP)
+#define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "noop"
+#elif IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC)
+#define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "panic"
+#endif
+
+#else
+static inline int watchdog_register_pretimeout(struct watchdog_device *wdd)
+{
+ return 0;
+}
+
+static inline void watchdog_unregister_pretimeout(struct watchdog_device *wdd)
+{
+}
+
+static inline int watchdog_pretimeout_available_governors_get(char *buf)
+{
+ return -EINVAL;
+}
+
+static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd,
+ char *buf)
+{
+ return -EINVAL;
+}
+
+static inline int watchdog_pretimeout_governor_set(struct watchdog_device *wdd,
+ const char *buf)
+{
+ return -EINVAL;
+}
+#endif
+
+#endif
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index fa1efef..b4e0cea 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -18,7 +18,10 @@
* GNU General Public License for more details.
*/
+#include <linux/delay.h>
#include <linux/i2c.h>
+#include <linux/ihex.h>
+#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
@@ -36,6 +39,8 @@
#define ZIIRAVE_STATE_OFF 0x1
#define ZIIRAVE_STATE_ON 0x2
+#define ZIIRAVE_FW_NAME "ziirave_wdt.fw"
+
static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
"host request", NULL, "illegal configuration",
"illegal instruction", "illegal trap",
@@ -50,12 +55,35 @@ static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
#define ZIIRAVE_WDT_PING 0x9
#define ZIIRAVE_WDT_RESET_DURATION 0xa
+#define ZIIRAVE_FIRM_PKT_TOTAL_SIZE 20
+#define ZIIRAVE_FIRM_PKT_DATA_SIZE 16
+#define ZIIRAVE_FIRM_FLASH_MEMORY_START 0x1600
+#define ZIIRAVE_FIRM_FLASH_MEMORY_END 0x2bbf
+
+/* Received and ready for next Download packet. */
+#define ZIIRAVE_FIRM_DOWNLOAD_ACK 1
+/* Currently writing to flash. Retry Download status in a moment! */
+#define ZIIRAVE_FIRM_DOWNLOAD_BUSY 2
+
+/* Wait for ACK timeout in ms */
+#define ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT 50
+
+/* Firmware commands */
+#define ZIIRAVE_CMD_DOWNLOAD_START 0x10
+#define ZIIRAVE_CMD_DOWNLOAD_END 0x11
+#define ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR 0x12
+#define ZIIRAVE_CMD_DOWNLOAD_READ_BYTE 0x13
+#define ZIIRAVE_CMD_RESET_PROCESSOR 0x0b
+#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER 0x0c
+#define ZIIRAVE_CMD_DOWNLOAD_PACKET 0x0e
+
struct ziirave_wdt_rev {
unsigned char major;
unsigned char minor;
};
struct ziirave_wdt_data {
+ struct mutex sysfs_mutex;
struct watchdog_device wdd;
struct ziirave_wdt_rev bootloader_rev;
struct ziirave_wdt_rev firmware_rev;
@@ -146,6 +174,293 @@ static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd)
return ret;
}
+static int ziirave_firm_wait_for_ack(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+ int ret;
+ unsigned long timeout;
+
+ timeout = jiffies + msecs_to_jiffies(ZIIRAVE_FIRM_WAIT_FOR_ACK_TIMEOUT);
+ do {
+ if (time_after(jiffies, timeout))
+ return -ETIMEDOUT;
+
+ usleep_range(5000, 10000);
+
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read byte\n");
+ return ret;
+ }
+ } while (ret == ZIIRAVE_FIRM_DOWNLOAD_BUSY);
+
+ return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO;
+}
+
+static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u16 addr)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+ u8 address[2];
+
+ address[0] = addr & 0xff;
+ address[1] = (addr >> 8) & 0xff;
+
+ return i2c_smbus_write_block_data(client,
+ ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR,
+ ARRAY_SIZE(address), address);
+}
+
+static int ziirave_firm_write_block_data(struct watchdog_device *wdd,
+ u8 command, u8 length, const u8 *data,
+ bool wait_for_ack)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+ int ret;
+
+ ret = i2c_smbus_write_block_data(client, command, length, data);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to send command 0x%02x: %d\n", command, ret);
+ return ret;
+ }
+
+ if (wait_for_ack)
+ ret = ziirave_firm_wait_for_ack(wdd);
+
+ return ret;
+}
+
+static int ziirave_firm_write_byte(struct watchdog_device *wdd, u8 command,
+ u8 byte, bool wait_for_ack)
+{
+ return ziirave_firm_write_block_data(wdd, command, 1, &byte,
+ wait_for_ack);
+}
+
+/*
+ * ziirave_firm_write_pkt() - Build and write a firmware packet
+ *
+ * A packet to send to the firmware is composed by following bytes:
+ * Length | Addr0 | Addr1 | Data0 .. Data15 | Checksum |
+ * Where,
+ * Length: A data byte containing the length of the data.
+ * Addr0: Low byte of the address.
+ * Addr1: High byte of the address.
+ * Data0 .. Data15: Array of 16 bytes of data.
+ * Checksum: Checksum byte to verify data integrity.
+ */
+static int ziirave_firm_write_pkt(struct watchdog_device *wdd,
+ const struct ihex_binrec *rec)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+ u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE];
+ int ret;
+ u16 addr;
+
+ memset(packet, 0, ARRAY_SIZE(packet));
+
+ /* Packet length */
+ packet[0] = (u8)be16_to_cpu(rec->len);
+ /* Packet address */
+ addr = (be32_to_cpu(rec->addr) & 0xffff) >> 1;
+ packet[1] = addr & 0xff;
+ packet[2] = (addr & 0xff00) >> 8;
+
+ /* Packet data */
+ if (be16_to_cpu(rec->len) > ZIIRAVE_FIRM_PKT_DATA_SIZE)
+ return -EMSGSIZE;
+ memcpy(packet + 3, rec->data, be16_to_cpu(rec->len));
+
+ /* Packet checksum */
+ for (i = 0; i < ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1; i++)
+ checksum += packet[i];
+ packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum;
+
+ ret = ziirave_firm_write_block_data(wdd, ZIIRAVE_CMD_DOWNLOAD_PACKET,
+ ARRAY_SIZE(packet), packet, true);
+ if (ret)
+ dev_err(&client->dev,
+ "Failed to write firmware packet at address 0x%04x: %d\n",
+ addr, ret);
+
+ return ret;
+}
+
+static int ziirave_firm_verify(struct watchdog_device *wdd,
+ const struct firmware *fw)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+ const struct ihex_binrec *rec;
+ int i, ret;
+ u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE];
+ u16 addr;
+
+ for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
+ /* Zero length marks end of records */
+ if (!be16_to_cpu(rec->len))
+ break;
+
+ addr = (be32_to_cpu(rec->addr) & 0xffff) >> 1;
+ if (addr < ZIIRAVE_FIRM_FLASH_MEMORY_START ||
+ addr > ZIIRAVE_FIRM_FLASH_MEMORY_END)
+ continue;
+
+ ret = ziirave_firm_set_read_addr(wdd, addr);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to send SET_READ_ADDR command: %d\n",
+ ret);
+ return ret;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(data); i++) {
+ ret = i2c_smbus_read_byte_data(client,
+ ZIIRAVE_CMD_DOWNLOAD_READ_BYTE);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Failed to READ DATA: %d\n", ret);
+ return ret;
+ }
+ data[i] = ret;
+ }
+
+ if (memcmp(data, rec->data, be16_to_cpu(rec->len))) {
+ dev_err(&client->dev,
+ "Firmware mismatch at address 0x%04x\n", addr);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int ziirave_firm_upload(struct watchdog_device *wdd,
+ const struct firmware *fw)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+ int ret, words_till_page_break;
+ const struct ihex_binrec *rec;
+ struct ihex_binrec *rec_new;
+
+ ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, 1,
+ false);
+ if (ret)
+ return ret;
+
+ msleep(500);
+
+ ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_START, 1, true);
+ if (ret)
+ return ret;
+
+ msleep(500);
+
+ for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
+ /* Zero length marks end of records */
+ if (!be16_to_cpu(rec->len))
+ break;
+
+ /* Check max data size */
+ if (be16_to_cpu(rec->len) > ZIIRAVE_FIRM_PKT_DATA_SIZE) {
+ dev_err(&client->dev, "Firmware packet too long (%d)\n",
+ be16_to_cpu(rec->len));
+ return -EMSGSIZE;
+ }
+
+ /* Calculate words till page break */
+ words_till_page_break = (64 - ((be32_to_cpu(rec->addr) >> 1) &
+ 0x3f));
+ if ((be16_to_cpu(rec->len) >> 1) > words_till_page_break) {
+ /*
+ * Data in passes page boundary, so we need to split in
+ * two blocks of data. Create a packet with the first
+ * block of data.
+ */
+ rec_new = kzalloc(sizeof(struct ihex_binrec) +
+ (words_till_page_break << 1),
+ GFP_KERNEL);
+ if (!rec_new)
+ return -ENOMEM;
+
+ rec_new->len = cpu_to_be16(words_till_page_break << 1);
+ rec_new->addr = rec->addr;
+ memcpy(rec_new->data, rec->data,
+ be16_to_cpu(rec_new->len));
+
+ ret = ziirave_firm_write_pkt(wdd, rec_new);
+ kfree(rec_new);
+ if (ret)
+ return ret;
+
+ /* Create a packet with the second block of data */
+ rec_new = kzalloc(sizeof(struct ihex_binrec) +
+ be16_to_cpu(rec->len) -
+ (words_till_page_break << 1),
+ GFP_KERNEL);
+ if (!rec_new)
+ return -ENOMEM;
+
+ /* Remaining bytes */
+ rec_new->len = rec->len -
+ cpu_to_be16(words_till_page_break << 1);
+
+ rec_new->addr = cpu_to_be32(be32_to_cpu(rec->addr) +
+ (words_till_page_break << 1));
+
+ memcpy(rec_new->data,
+ rec->data + (words_till_page_break << 1),
+ be16_to_cpu(rec_new->len));
+
+ ret = ziirave_firm_write_pkt(wdd, rec_new);
+ kfree(rec_new);
+ if (ret)
+ return ret;
+ } else {
+ ret = ziirave_firm_write_pkt(wdd, rec);
+ if (ret)
+ return ret;
+ }
+ }
+
+ /* For end of download, the length field will be set to 0 */
+ rec_new = kzalloc(sizeof(struct ihex_binrec) + 1, GFP_KERNEL);
+ if (!rec_new)
+ return -ENOMEM;
+
+ ret = ziirave_firm_write_pkt(wdd, rec_new);
+ kfree(rec_new);
+ if (ret) {
+ dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret);
+ return ret;
+ }
+
+ /* This sleep seems to be required */
+ msleep(20);
+
+ /* Start firmware verification */
+ ret = ziirave_firm_verify(wdd, fw);
+ if (ret) {
+ dev_err(&client->dev,
+ "Failed to verify firmware: %d\n", ret);
+ return ret;
+ }
+
+ /* End download operation */
+ ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_END, 1, false);
+ if (ret)
+ return ret;
+
+ /* Reset the processor */
+ ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_RESET_PROCESSOR, 1,
+ false);
+ if (ret)
+ return ret;
+
+ msleep(500);
+
+ return 0;
+}
+
static const struct watchdog_info ziirave_wdt_info = {
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
.identity = "Zodiac RAVE Watchdog",
@@ -166,9 +481,18 @@ static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev,
{
struct i2c_client *client = to_i2c_client(dev->parent);
struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
+ int ret;
+
+ ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
+ if (ret)
+ return ret;
+
+ ret = sprintf(buf, "02.%02u.%02u", w_priv->firmware_rev.major,
+ w_priv->firmware_rev.minor);
- return sprintf(buf, "02.%02u.%02u", w_priv->firmware_rev.major,
- w_priv->firmware_rev.minor);
+ mutex_unlock(&w_priv->sysfs_mutex);
+
+ return ret;
}
static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm,
@@ -180,9 +504,18 @@ static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev,
{
struct i2c_client *client = to_i2c_client(dev->parent);
struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
+ int ret;
- return sprintf(buf, "01.%02u.%02u", w_priv->bootloader_rev.major,
- w_priv->bootloader_rev.minor);
+ ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
+ if (ret)
+ return ret;
+
+ ret = sprintf(buf, "01.%02u.%02u", w_priv->bootloader_rev.major,
+ w_priv->bootloader_rev.minor);
+
+ mutex_unlock(&w_priv->sysfs_mutex);
+
+ return ret;
}
static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot,
@@ -194,17 +527,81 @@ static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev,
{
struct i2c_client *client = to_i2c_client(dev->parent);
struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
+ int ret;
+
+ ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
+ if (ret)
+ return ret;
+
+ ret = sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);
- return sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);
+ mutex_unlock(&w_priv->sysfs_mutex);
+
+ return ret;
}
static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason,
NULL);
+static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
+ const struct firmware *fw;
+ int err;
+
+ err = request_ihex_firmware(&fw, ZIIRAVE_FW_NAME, dev);
+ if (err) {
+ dev_err(&client->dev, "Failed to request ihex firmware\n");
+ return err;
+ }
+
+ err = mutex_lock_interruptible(&w_priv->sysfs_mutex);
+ if (err)
+ goto release_firmware;
+
+ err = ziirave_firm_upload(&w_priv->wdd, fw);
+ if (err) {
+ dev_err(&client->dev, "The firmware update failed: %d\n", err);
+ goto unlock_mutex;
+ }
+
+ /* Update firmware version */
+ err = ziirave_wdt_revision(client, &w_priv->firmware_rev,
+ ZIIRAVE_WDT_FIRM_VER_MAJOR);
+ if (err) {
+ dev_err(&client->dev, "Failed to read firmware version: %d\n",
+ err);
+ goto unlock_mutex;
+ }
+
+ dev_info(&client->dev, "Firmware updated to version 02.%02u.%02u\n",
+ w_priv->firmware_rev.major, w_priv->firmware_rev.minor);
+
+ /* Restore the watchdog timeout */
+ err = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);
+ if (err)
+ dev_err(&client->dev, "Failed to set timeout: %d\n", err);
+
+unlock_mutex:
+ mutex_unlock(&w_priv->sysfs_mutex);
+
+release_firmware:
+ release_firmware(fw);
+
+ return err ? err : count;
+}
+
+static DEVICE_ATTR(update_firmware, S_IWUSR, NULL,
+ ziirave_wdt_sysfs_store_firm);
+
static struct attribute *ziirave_wdt_attrs[] = {
&dev_attr_firmware_version.attr,
&dev_attr_bootloader_version.attr,
&dev_attr_reset_reason.attr,
+ &dev_attr_update_firmware.attr,
NULL
};
ATTRIBUTE_GROUPS(ziirave_wdt);
@@ -252,6 +649,8 @@ static int ziirave_wdt_probe(struct i2c_client *client,
if (!w_priv)
return -ENOMEM;
+ mutex_init(&w_priv->sysfs_mutex);
+
w_priv->wdd.info = &ziirave_wdt_info;
w_priv->wdd.ops = &ziirave_wdt_ops;
w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN;
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index c1e9f29..f2d7402 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1209,6 +1209,8 @@ COMPATIBLE_IOCTL(WDIOC_SETOPTIONS)
COMPATIBLE_IOCTL(WDIOC_KEEPALIVE)
COMPATIBLE_IOCTL(WDIOC_SETTIMEOUT)
COMPATIBLE_IOCTL(WDIOC_GETTIMEOUT)
+COMPATIBLE_IOCTL(WDIOC_SETPRETIMEOUT)
+COMPATIBLE_IOCTL(WDIOC_GETPRETIMEOUT)
/* Big R */
COMPATIBLE_IOCTL(RNDGETENTCNT)
COMPATIBLE_IOCTL(RNDADDTOENTCNT)
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 7047bc7..35a4d81 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -19,6 +19,7 @@
struct watchdog_ops;
struct watchdog_device;
struct watchdog_core_data;
+struct watchdog_governor;
/** struct watchdog_ops - The watchdog-devices operations
*
@@ -28,6 +29,7 @@ struct watchdog_core_data;
* @ping: The routine that sends a keepalive ping to the 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).
+ * @set_pretimeout:The routine for setting the watchdog devices pretimeout.
* @get_timeleft:The routine that gets the time left before a reset (in seconds).
* @restart: The routine for restarting the machine.
* @ioctl: The routines that handles extra ioctl calls.
@@ -46,6 +48,7 @@ struct watchdog_ops {
int (*ping)(struct watchdog_device *);
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
+ int (*set_pretimeout)(struct watchdog_device *, unsigned int);
unsigned int (*get_timeleft)(struct watchdog_device *);
int (*restart)(struct watchdog_device *, unsigned long, void *);
long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
@@ -59,8 +62,10 @@ struct watchdog_ops {
* watchdog device.
* @info: Pointer to a watchdog_info structure.
* @ops: Pointer to the list of watchdog operations.
+ * @gov: Pointer to watchdog pretimeout governor.
* @bootstatus: Status of the watchdog device at boot.
* @timeout: The watchdog devices timeout value (in seconds).
+ * @pretimeout: The watchdog devices pre_timeout value.
* @min_timeout:The watchdog devices minimum timeout value (in seconds).
* @max_timeout:The watchdog devices maximum timeout value (in seconds)
* as configurable from user space. Only relevant if
@@ -94,8 +99,10 @@ struct watchdog_device {
const struct attribute_group **groups;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
+ const struct watchdog_governor *gov;
unsigned int bootstatus;
unsigned int timeout;
+ unsigned int pretimeout;
unsigned int min_timeout;
unsigned int max_timeout;
unsigned int min_hw_heartbeat_ms;
@@ -163,6 +170,13 @@ static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigne
t > wdd->max_timeout);
}
+/* Use the following function to check if a pretimeout value is invalid */
+static inline bool watchdog_pretimeout_invalid(struct watchdog_device *wdd,
+ unsigned int t)
+{
+ return t && wdd->timeout && t >= wdd->timeout;
+}
+
/* Use the following functions to manipulate watchdog driver specific data */
static inline void watchdog_set_drvdata(struct watchdog_device *wdd, void *data)
{
@@ -174,6 +188,16 @@ static inline void *watchdog_get_drvdata(struct watchdog_device *wdd)
return wdd->driver_data;
}
+/* Use the following functions to report watchdog pretimeout event */
+#if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV)
+void watchdog_notify_pretimeout(struct watchdog_device *wdd);
+#else
+static inline void watchdog_notify_pretimeout(struct watchdog_device *wdd)
+{
+ pr_alert("watchdog%d: pretimeout event\n", wdd->id);
+}
+#endif
+
/* 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,