Re: [PATCH v2 2/2] watchdog: imx2_wdt: add set_pretimeout interface
On 11/04/2015 07:46 AM, Vladimir Zapolskiy wrote:
Hi Robin,
On 03.11.2015 08:11, Robin Gong wrote:
Enable set_pretimeout interface and trigger the pretimeout interrupt before
watchdog timeout event happen.
Signed-off-by: Robin Gong
---
[snip]
+
+static irqreturn_t imx2_wdt_isr(int irq, void *dev_id)
+{
+ struct platform_device *pdev = dev_id;
+ struct watchdog_device *wdog = platform_get_drvdata(pdev);
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+ u32 val;
+
+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
+ if (val & IMX2_WDT_WICR_WTIS) {
+ /*clear interrupt status bit*/
+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val);
+ panic("pre-timeout:%d, %d Seconds remained\n", wdog->pretimeout,
+ wdog->timeout - wdog->pretimeout);
I don't think it is a good idea to panic on pretimeout interrupt, for
instance pretimeout interrupt may be used for any other purposes - ping
watchdog, dump some system information before reboot and so on.
In general I am even not completely convinced that the pretimeout interrupt
handler should be placed in the driver, it may happen that there are some
users outside, who wants to get this interrupt and act according to the event.
Ah yes, this is one of the reasons why adding this functionality into the
watchdog core keeps going nowhere. Some of the people involved absolutely
insist that a watchdog pretimeout should result in a panic, others are just
as strongly opposed to it. At the end, there is no consensus, and we end up
doing nothing, since nothing is better than each driver behaving differently.
Just like politics, I guess :-(.
Guenter
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Re: [PATCH v2 2/2] watchdog: imx2_wdt: add set_pretimeout interface
Hi Robin,
On 03.11.2015 08:11, Robin Gong wrote:
> Enable set_pretimeout interface and trigger the pretimeout interrupt before
> watchdog timeout event happen.
>
> Signed-off-by: Robin Gong
> ---
[snip]
> +
> +static irqreturn_t imx2_wdt_isr(int irq, void *dev_id)
> +{
> + struct platform_device *pdev = dev_id;
> + struct watchdog_device *wdog = platform_get_drvdata(pdev);
> + struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
> + u32 val;
> +
> + regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
> + if (val & IMX2_WDT_WICR_WTIS) {
> + /*clear interrupt status bit*/
> + regmap_write(wdev->regmap, IMX2_WDT_WICR, val);
> + panic("pre-timeout:%d, %d Seconds remained\n", wdog->pretimeout,
> + wdog->timeout - wdog->pretimeout);
I don't think it is a good idea to panic on pretimeout interrupt, for
instance pretimeout interrupt may be used for any other purposes - ping
watchdog, dump some system information before reboot and so on.
In general I am even not completely convinced that the pretimeout interrupt
handler should be placed in the driver, it may happen that there are some
users outside, who wants to get this interrupt and act according to the event.
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
--
With best wishes,
Vladimir
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Re: [PATCH v2 2/2] watchdog: imx2_wdt: add set_pretimeout interface
On Tue, Nov 03, 2015 at 09:26:16AM -0800, Guenter Roeck wrote:
> On 11/03/2015 12:04 AM, Robin Gong wrote:
> >On Mon, Nov 02, 2015 at 11:48:29PM -0800, Guenter Roeck wrote:
> >>On 11/02/2015 10:11 PM, Robin Gong wrote:
> >>>Enable set_pretimeout interface and trigger the pretimeout interrupt before
> >>>watchdog timeout event happen.
> >>>
> >>>Signed-off-by: Robin Gong
> >>>---
> >>> drivers/watchdog/imx2_wdt.c | 58
> >>> -
> >>> 1 file changed, 57 insertions(+), 1 deletion(-)
> >>>
> >>>diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
> >>>index 0bb1a1d..bd42857 100644
> >>>--- a/drivers/watchdog/imx2_wdt.c
> >>>+++ b/drivers/watchdog/imx2_wdt.c
> >>>@@ -24,6 +24,7 @@
> >>> #include
> >>> #include
> >>> #include
> >>>+#include
> >>> #include
> >>> #include
> >>> #include
> >>>@@ -52,12 +53,18 @@
> >>> #define IMX2_WDT_WRSR0x04/* Reset Status
> >>> Register */
> >>> #define IMX2_WDT_WRSR_TOUT (1 << 1)/* -> Reset due to
> >>> Timeout */
> >>>
> >>>+#define IMX2_WDT_WICR 0x06/*Interrupt Control
> >>>Register*/
> >>>+#define IMX2_WDT_WICR_WIE (1 << 15) /* -> Interrupt Enable */
> >>>+#define IMX2_WDT_WICR_WTIS(1 << 14) /* -> Interrupt Status
> >>>*/
> >>>+#define IMX2_WDT_WICR_WICT(0xFF) /* Watchdog Interrupt Timeout */
> >>
> >>Unnecessary ( )
> >>
> >>>+
> >>> #define IMX2_WDT_WMCR0x08/* Misc Register */
> >>>
> >>> #define IMX2_WDT_MAX_TIME128
> >>> #define IMX2_WDT_DEFAULT_TIME60 /* in seconds */
> >>>
> >>> #define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
> >>>+#define WDOG_SEC_TO_PRECOUNT(s) ((s) * 2) /* set WDOG pre timeout
> >>>count*/
> >>>
> >>> struct imx2_wdt_device {
> >>> struct clk *clk;
> >>>@@ -80,7 +87,8 @@ MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds
> >>>(default="
> >>>
> >>> static const struct watchdog_info imx2_wdt_info = {
> >>> .identity = "imx2+ watchdog",
> >>>- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
> >>>+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE
> >>>+ | WDIOF_PRETIMEOUT,
> >>> };
> >>>
> >>> static int imx2_restart_handler(struct notifier_block *this, unsigned
> >>> long mode,
> >>>@@ -207,12 +215,49 @@ static inline void imx2_wdt_ping_if_active(struct
> >>>watchdog_device *wdog)
> >>> }
> >>> }
> >>>
> >>>+static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog,
> >>>+ unsigned int new_timeout)
> >>>+{
> >>>+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
> >>>+ u32 val;
> >>>+
> >>>+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
> >>>+ /* set the new pre-timeout value in the WSR */
> >>>+ val &= ~IMX2_WDT_WICR_WICT;
> >>>+ val |= WDOG_SEC_TO_PRECOUNT(new_timeout);
> >>
> >>Looking into this, I think we need more information in the first patch.
> >>Specifically, we need a value for max_pretimeout and validate it
> >>(new_timeout must be smaller than 128 to avoid overflows, independent
> >>of the maximum timeout).
> >>
> >I think it's enough, since there is "t >= wdd->timeout" in
> >watchdog_pretimeout_invalid() of the first patch and wdd->timeout is never
> >bigger than wdd->max_timeout which setting in imx2_wdt.c as 128.
>
> We are dealing with infrastructure code here. This happens to work for your
> driver,
> but that doesn't mean it will work for other drivers.
>
> Anyway, I recalled that there is another patchset pending to add pretimeout
> support into the watchdog code. I'll have to dig that out and consolidate the
> two.
>
> Guenter
>
Got it. Thanks.
> >>>+
> >>>+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val | IMX2_WDT_WICR_WIE);
> >>>+
> >>>+ wdog->pretimeout = new_timeout;
> >>>+
> >>>+ return 0;
> >>>+}
> >>>+
> >>>+static irqreturn_t imx2_wdt_isr(int irq, void *dev_id)
> >>>+{
> >>>+ struct platform_device *pdev = dev_id;
> >>>+ struct watchdog_device *wdog = platform_get_drvdata(pdev);
> >>>+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
> >>>+ u32 val;
> >>>+
> >>>+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
> >>>+ if (val & IMX2_WDT_WICR_WTIS) {
> >>>+ /*clear interrupt status bit*/
> >>>+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val);
> >>>+ panic("pre-timeout:%d, %d Seconds remained\n", wdog->pretimeout,
> >>
> >>"seconds" - no capital 'S'.
> >>
> >>>+wdog->timeout - wdog->pretimeout);
> >>>+ }
> >>>+
> >>>+ return IRQ_HANDLED;
> >>>+}
> >>>+
> >>> static const struct watchdog_ops imx2_wdt_ops = {
> >>> .owner = THIS_MODULE,
> >>> .start = imx2_wdt_start,
> >>> .stop = imx2_wdt_stop,
> >>> .ping = imx2_wdt_ping,
> >>> .set_timeout = imx2_wdt_set_timeout,
> >>>+ .set_pretimeout = imx2_wdt_set_pretimeout,
> >>> };
> >>>
> >>> static const struct regmap_config imx2_wdt_regmap_confi
Re: [PATCH v2 2/2] watchdog: imx2_wdt: add set_pretimeout interface
On 11/03/2015 12:04 AM, Robin Gong wrote:
On Mon, Nov 02, 2015 at 11:48:29PM -0800, Guenter Roeck wrote:
On 11/02/2015 10:11 PM, Robin Gong wrote:
Enable set_pretimeout interface and trigger the pretimeout interrupt before
watchdog timeout event happen.
Signed-off-by: Robin Gong
---
drivers/watchdog/imx2_wdt.c | 58 -
1 file changed, 57 insertions(+), 1 deletion(-)
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 0bb1a1d..bd42857 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -24,6 +24,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -52,12 +53,18 @@
#define IMX2_WDT_WRSR 0x04/* Reset Status Register */
#define IMX2_WDT_WRSR_TOUT(1 << 1) /* -> Reset due to Timeout */
+#define IMX2_WDT_WICR 0x06/*Interrupt Control Register*/
+#define IMX2_WDT_WICR_WIE (1 << 15) /* -> Interrupt Enable */
+#define IMX2_WDT_WICR_WTIS (1 << 14) /* -> Interrupt Status */
+#define IMX2_WDT_WICR_WICT (0xFF) /* Watchdog Interrupt Timeout */
Unnecessary ( )
+
#define IMX2_WDT_WMCR 0x08/* Misc Register */
#define IMX2_WDT_MAX_TIME 128
#define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
+#define WDOG_SEC_TO_PRECOUNT(s)((s) * 2) /* set WDOG pre timeout
count*/
struct imx2_wdt_device {
struct clk *clk;
@@ -80,7 +87,8 @@ MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds
(default="
static const struct watchdog_info imx2_wdt_info = {
.identity = "imx2+ watchdog",
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE
+ | WDIOF_PRETIMEOUT,
};
static int imx2_restart_handler(struct notifier_block *this, unsigned long
mode,
@@ -207,12 +215,49 @@ static inline void imx2_wdt_ping_if_active(struct
watchdog_device *wdog)
}
}
+static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog,
+ unsigned int new_timeout)
+{
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+ u32 val;
+
+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
+ /* set the new pre-timeout value in the WSR */
+ val &= ~IMX2_WDT_WICR_WICT;
+ val |= WDOG_SEC_TO_PRECOUNT(new_timeout);
Looking into this, I think we need more information in the first patch.
Specifically, we need a value for max_pretimeout and validate it
(new_timeout must be smaller than 128 to avoid overflows, independent
of the maximum timeout).
I think it's enough, since there is "t >= wdd->timeout" in
watchdog_pretimeout_invalid() of the first patch and wdd->timeout is never
bigger than wdd->max_timeout which setting in imx2_wdt.c as 128.
We are dealing with infrastructure code here. This happens to work for your
driver,
but that doesn't mean it will work for other drivers.
Anyway, I recalled that there is another patchset pending to add pretimeout
support into the watchdog code. I'll have to dig that out and consolidate the
two.
Guenter
+
+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val | IMX2_WDT_WICR_WIE);
+
+ wdog->pretimeout = new_timeout;
+
+ return 0;
+}
+
+static irqreturn_t imx2_wdt_isr(int irq, void *dev_id)
+{
+ struct platform_device *pdev = dev_id;
+ struct watchdog_device *wdog = platform_get_drvdata(pdev);
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+ u32 val;
+
+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
+ if (val & IMX2_WDT_WICR_WTIS) {
+ /*clear interrupt status bit*/
+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val);
+ panic("pre-timeout:%d, %d Seconds remained\n", wdog->pretimeout,
"seconds" - no capital 'S'.
+ wdog->timeout - wdog->pretimeout);
+ }
+
+ return IRQ_HANDLED;
+}
+
static const struct watchdog_ops imx2_wdt_ops = {
.owner = THIS_MODULE,
.start = imx2_wdt_start,
.stop = imx2_wdt_stop,
.ping = imx2_wdt_ping,
.set_timeout = imx2_wdt_set_timeout,
+ .set_pretimeout = imx2_wdt_set_pretimeout,
};
static const struct regmap_config imx2_wdt_regmap_config = {
@@ -229,6 +274,7 @@ static int __init imx2_wdt_probe(struct platform_device
*pdev)
struct resource *res;
void __iomem *base;
int ret;
+ int irq;
u32 val;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
@@ -294,6 +340,16 @@ static int __init imx2_wdt_probe(struct platform_device
*pdev)
goto disable_clk;
}
+ irq = platform_get_irq(pdev, 0);
+ if (irq > 0) {
+ ret = devm_request_irq(&pdev->dev, irq, imx2_wdt_isr, 0,
+
Re: [PATCH v2 2/2] watchdog: imx2_wdt: add set_pretimeout interface
On Mon, Nov 02, 2015 at 11:48:29PM -0800, Guenter Roeck wrote:
> On 11/02/2015 10:11 PM, Robin Gong wrote:
> >Enable set_pretimeout interface and trigger the pretimeout interrupt before
> >watchdog timeout event happen.
> >
> >Signed-off-by: Robin Gong
> >---
> > drivers/watchdog/imx2_wdt.c | 58
> > -
> > 1 file changed, 57 insertions(+), 1 deletion(-)
> >
> >diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
> >index 0bb1a1d..bd42857 100644
> >--- a/drivers/watchdog/imx2_wdt.c
> >+++ b/drivers/watchdog/imx2_wdt.c
> >@@ -24,6 +24,7 @@
> > #include
> > #include
> > #include
> >+#include
> > #include
> > #include
> > #include
> >@@ -52,12 +53,18 @@
> > #define IMX2_WDT_WRSR 0x04/* Reset Status
> > Register */
> > #define IMX2_WDT_WRSR_TOUT (1 << 1)/* -> Reset due to Timeout */
> >
> >+#define IMX2_WDT_WICR 0x06/*Interrupt Control
> >Register*/
> >+#define IMX2_WDT_WICR_WIE (1 << 15) /* -> Interrupt Enable */
> >+#define IMX2_WDT_WICR_WTIS (1 << 14) /* -> Interrupt Status */
> >+#define IMX2_WDT_WICR_WICT (0xFF) /* Watchdog Interrupt Timeout */
>
> Unnecessary ( )
>
> >+
> > #define IMX2_WDT_WMCR 0x08/* Misc Register */
> >
> > #define IMX2_WDT_MAX_TIME 128
> > #define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
> >
> > #define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
> >+#define WDOG_SEC_TO_PRECOUNT(s) ((s) * 2) /* set WDOG pre timeout
> >count*/
> >
> > struct imx2_wdt_device {
> > struct clk *clk;
> >@@ -80,7 +87,8 @@ MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds
> >(default="
> >
> > static const struct watchdog_info imx2_wdt_info = {
> > .identity = "imx2+ watchdog",
> >-.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
> >+.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE
> >+ | WDIOF_PRETIMEOUT,
> > };
> >
> > static int imx2_restart_handler(struct notifier_block *this, unsigned long
> > mode,
> >@@ -207,12 +215,49 @@ static inline void imx2_wdt_ping_if_active(struct
> >watchdog_device *wdog)
> > }
> > }
> >
> >+static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog,
> >+ unsigned int new_timeout)
> >+{
> >+struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
> >+u32 val;
> >+
> >+regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
> >+/* set the new pre-timeout value in the WSR */
> >+val &= ~IMX2_WDT_WICR_WICT;
> >+val |= WDOG_SEC_TO_PRECOUNT(new_timeout);
>
> Looking into this, I think we need more information in the first patch.
> Specifically, we need a value for max_pretimeout and validate it
> (new_timeout must be smaller than 128 to avoid overflows, independent
> of the maximum timeout).
>
I think it's enough, since there is "t >= wdd->timeout" in
watchdog_pretimeout_invalid() of the first patch and wdd->timeout is never
bigger than wdd->max_timeout which setting in imx2_wdt.c as 128.
> >+
> >+regmap_write(wdev->regmap, IMX2_WDT_WICR, val | IMX2_WDT_WICR_WIE);
> >+
> >+wdog->pretimeout = new_timeout;
> >+
> >+return 0;
> >+}
> >+
> >+static irqreturn_t imx2_wdt_isr(int irq, void *dev_id)
> >+{
> >+struct platform_device *pdev = dev_id;
> >+struct watchdog_device *wdog = platform_get_drvdata(pdev);
> >+struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
> >+u32 val;
> >+
> >+regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
> >+if (val & IMX2_WDT_WICR_WTIS) {
> >+/*clear interrupt status bit*/
> >+regmap_write(wdev->regmap, IMX2_WDT_WICR, val);
> >+panic("pre-timeout:%d, %d Seconds remained\n", wdog->pretimeout,
>
> "seconds" - no capital 'S'.
>
> >+ wdog->timeout - wdog->pretimeout);
> >+}
> >+
> >+return IRQ_HANDLED;
> >+}
> >+
> > static const struct watchdog_ops imx2_wdt_ops = {
> > .owner = THIS_MODULE,
> > .start = imx2_wdt_start,
> > .stop = imx2_wdt_stop,
> > .ping = imx2_wdt_ping,
> > .set_timeout = imx2_wdt_set_timeout,
> >+.set_pretimeout = imx2_wdt_set_pretimeout,
> > };
> >
> > static const struct regmap_config imx2_wdt_regmap_config = {
> >@@ -229,6 +274,7 @@ static int __init imx2_wdt_probe(struct platform_device
> >*pdev)
> > struct resource *res;
> > void __iomem *base;
> > int ret;
> >+int irq;
> > u32 val;
> >
> > wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
> >@@ -294,6 +340,16 @@ static int __init imx2_wdt_probe(struct platform_device
> >*pdev)
> > goto disable_clk;
> > }
> >
> >+irq = platform_get_irq(pdev, 0);
> >+if (irq > 0) {
> >+ret = devm_request_irq(&pdev->dev, irq, imx2_wdt_isr, 0,
> >+ dev_name(&pdev->dev), pdev);
> >+if (ret) {
> >+
Re: [PATCH v2 2/2] watchdog: imx2_wdt: add set_pretimeout interface
On 11/02/2015 10:11 PM, Robin Gong wrote:
Enable set_pretimeout interface and trigger the pretimeout interrupt before
watchdog timeout event happen.
Signed-off-by: Robin Gong
---
drivers/watchdog/imx2_wdt.c | 58 -
1 file changed, 57 insertions(+), 1 deletion(-)
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 0bb1a1d..bd42857 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -24,6 +24,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -52,12 +53,18 @@
#define IMX2_WDT_WRSR 0x04/* Reset Status Register */
#define IMX2_WDT_WRSR_TOUT(1 << 1) /* -> Reset due to Timeout */
+#define IMX2_WDT_WICR 0x06/*Interrupt Control Register*/
+#define IMX2_WDT_WICR_WIE (1 << 15) /* -> Interrupt Enable */
+#define IMX2_WDT_WICR_WTIS (1 << 14) /* -> Interrupt Status */
+#define IMX2_WDT_WICR_WICT (0xFF) /* Watchdog Interrupt Timeout */
Unnecessary ( )
+
#define IMX2_WDT_WMCR 0x08/* Misc Register */
#define IMX2_WDT_MAX_TIME 128
#define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
+#define WDOG_SEC_TO_PRECOUNT(s)((s) * 2) /* set WDOG pre timeout
count*/
struct imx2_wdt_device {
struct clk *clk;
@@ -80,7 +87,8 @@ MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds
(default="
static const struct watchdog_info imx2_wdt_info = {
.identity = "imx2+ watchdog",
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE
+ | WDIOF_PRETIMEOUT,
};
static int imx2_restart_handler(struct notifier_block *this, unsigned long
mode,
@@ -207,12 +215,49 @@ static inline void imx2_wdt_ping_if_active(struct
watchdog_device *wdog)
}
}
+static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog,
+ unsigned int new_timeout)
+{
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+ u32 val;
+
+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
+ /* set the new pre-timeout value in the WSR */
+ val &= ~IMX2_WDT_WICR_WICT;
+ val |= WDOG_SEC_TO_PRECOUNT(new_timeout);
Looking into this, I think we need more information in the first patch.
Specifically, we need a value for max_pretimeout and validate it
(new_timeout must be smaller than 128 to avoid overflows, independent
of the maximum timeout).
+
+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val | IMX2_WDT_WICR_WIE);
+
+ wdog->pretimeout = new_timeout;
+
+ return 0;
+}
+
+static irqreturn_t imx2_wdt_isr(int irq, void *dev_id)
+{
+ struct platform_device *pdev = dev_id;
+ struct watchdog_device *wdog = platform_get_drvdata(pdev);
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+ u32 val;
+
+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
+ if (val & IMX2_WDT_WICR_WTIS) {
+ /*clear interrupt status bit*/
+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val);
+ panic("pre-timeout:%d, %d Seconds remained\n", wdog->pretimeout,
"seconds" - no capital 'S'.
+ wdog->timeout - wdog->pretimeout);
+ }
+
+ return IRQ_HANDLED;
+}
+
static const struct watchdog_ops imx2_wdt_ops = {
.owner = THIS_MODULE,
.start = imx2_wdt_start,
.stop = imx2_wdt_stop,
.ping = imx2_wdt_ping,
.set_timeout = imx2_wdt_set_timeout,
+ .set_pretimeout = imx2_wdt_set_pretimeout,
};
static const struct regmap_config imx2_wdt_regmap_config = {
@@ -229,6 +274,7 @@ static int __init imx2_wdt_probe(struct platform_device
*pdev)
struct resource *res;
void __iomem *base;
int ret;
+ int irq;
u32 val;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
@@ -294,6 +340,16 @@ static int __init imx2_wdt_probe(struct platform_device
*pdev)
goto disable_clk;
}
+ irq = platform_get_irq(pdev, 0);
+ if (irq > 0) {
+ ret = devm_request_irq(&pdev->dev, irq, imx2_wdt_isr, 0,
+ dev_name(&pdev->dev), pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get irq %d\n", irq);
+ goto disable_clk;
+ }
+ }
+
wdev->restart_handler.notifier_call = imx2_restart_handler;
wdev->restart_handler.priority = 128;
ret = register_restart_handler(&wdev->restart_handler);
--
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[PATCH v2 2/2] watchdog: imx2_wdt: add set_pretimeout interface
Enable set_pretimeout interface and trigger the pretimeout interrupt before
watchdog timeout event happen.
Signed-off-by: Robin Gong
---
drivers/watchdog/imx2_wdt.c | 58 -
1 file changed, 57 insertions(+), 1 deletion(-)
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 0bb1a1d..bd42857 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -24,6 +24,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -52,12 +53,18 @@
#define IMX2_WDT_WRSR 0x04/* Reset Status Register */
#define IMX2_WDT_WRSR_TOUT (1 << 1)/* -> Reset due to Timeout */
+#define IMX2_WDT_WICR 0x06/*Interrupt Control Register*/
+#define IMX2_WDT_WICR_WIE (1 << 15) /* -> Interrupt Enable */
+#define IMX2_WDT_WICR_WTIS (1 << 14) /* -> Interrupt Status */
+#define IMX2_WDT_WICR_WICT (0xFF) /* Watchdog Interrupt Timeout */
+
#define IMX2_WDT_WMCR 0x08/* Misc Register */
#define IMX2_WDT_MAX_TIME 128
#define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
+#define WDOG_SEC_TO_PRECOUNT(s)((s) * 2) /* set WDOG pre timeout
count*/
struct imx2_wdt_device {
struct clk *clk;
@@ -80,7 +87,8 @@ MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds
(default="
static const struct watchdog_info imx2_wdt_info = {
.identity = "imx2+ watchdog",
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE
+ | WDIOF_PRETIMEOUT,
};
static int imx2_restart_handler(struct notifier_block *this, unsigned long
mode,
@@ -207,12 +215,49 @@ static inline void imx2_wdt_ping_if_active(struct
watchdog_device *wdog)
}
}
+static int imx2_wdt_set_pretimeout(struct watchdog_device *wdog,
+ unsigned int new_timeout)
+{
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+ u32 val;
+
+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
+ /* set the new pre-timeout value in the WSR */
+ val &= ~IMX2_WDT_WICR_WICT;
+ val |= WDOG_SEC_TO_PRECOUNT(new_timeout);
+
+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val | IMX2_WDT_WICR_WIE);
+
+ wdog->pretimeout = new_timeout;
+
+ return 0;
+}
+
+static irqreturn_t imx2_wdt_isr(int irq, void *dev_id)
+{
+ struct platform_device *pdev = dev_id;
+ struct watchdog_device *wdog = platform_get_drvdata(pdev);
+ struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
+ u32 val;
+
+ regmap_read(wdev->regmap, IMX2_WDT_WICR, &val);
+ if (val & IMX2_WDT_WICR_WTIS) {
+ /*clear interrupt status bit*/
+ regmap_write(wdev->regmap, IMX2_WDT_WICR, val);
+ panic("pre-timeout:%d, %d Seconds remained\n", wdog->pretimeout,
+ wdog->timeout - wdog->pretimeout);
+ }
+
+ return IRQ_HANDLED;
+}
+
static const struct watchdog_ops imx2_wdt_ops = {
.owner = THIS_MODULE,
.start = imx2_wdt_start,
.stop = imx2_wdt_stop,
.ping = imx2_wdt_ping,
.set_timeout = imx2_wdt_set_timeout,
+ .set_pretimeout = imx2_wdt_set_pretimeout,
};
static const struct regmap_config imx2_wdt_regmap_config = {
@@ -229,6 +274,7 @@ static int __init imx2_wdt_probe(struct platform_device
*pdev)
struct resource *res;
void __iomem *base;
int ret;
+ int irq;
u32 val;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
@@ -294,6 +340,16 @@ static int __init imx2_wdt_probe(struct platform_device
*pdev)
goto disable_clk;
}
+ irq = platform_get_irq(pdev, 0);
+ if (irq > 0) {
+ ret = devm_request_irq(&pdev->dev, irq, imx2_wdt_isr, 0,
+ dev_name(&pdev->dev), pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get irq %d\n", irq);
+ goto disable_clk;
+ }
+ }
+
wdev->restart_handler.notifier_call = imx2_restart_handler;
wdev->restart_handler.priority = 128;
ret = register_restart_handler(&wdev->restart_handler);
--
1.9.1
--
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