[PATCH V4 0/3] add UniPhier watchdog support

[PATCH V4 0/3] add UniPhier watchdog support

[Keiji Hayashibara]

This series adds support for watchdog timer implemented on UniPhier LD11 and
LD20 SoCs. This driver supports watchdog and system reset for SoCs.

patch V3
http://www.spinics.net/lists/linux-watchdog/msg11889.html

patch V2
http://www.spinics.net/lists/linux-watchdog/msg11852.html

patch V1
http://www.spinics.net/lists/linux-watchdog/msg11782.html


Changes between V4 and V3
=========================

 * Add own dependencies to Kconfig.

Changes between V3 and V2
=========================

 * Make it possible to take a timeout from devicetree.
 * Sort #include headlers alphabetically.
 * Correct the description of dt-bindings document and this patch comment.
 * Correct the description of license as GPLv2.
 * Correct MODULE_AUTHOR()
 * Remove unnecessary code.

Changes between V2 and V1
=========================
1. Add barrier code in uniphier_watchdog_ping() and __uniphier_watchdog_start().
2. Fix issues according to review comments.

Keiji Hayashibara (3):
  dt-bindings: watchdog: add description for UniPhier WDT controller
  watchdog: uniphier: add UniPhier watchdog driver
  arm64: dts: uniphier: add watchdog node for LD11 and LD20

 .../devicetree/bindings/watchdog/uniphier-wdt.txt  |  20 ++
 Documentation/watchdog/watchdog-parameters.txt     |   6 +
 arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi   |   4 +
 arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi   |   4 +
 drivers/watchdog/Kconfig                           |  12 +
 drivers/watchdog/Makefile                          |   1 +
 drivers/watchdog/uniphier_wdt.c                    | 268 +++++++++++++++++++++
 7 files changed, 315 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
 create mode 100644 drivers/watchdog/uniphier_wdt.c

-- 
2.7.4

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[PATCH V4 1/3] dt-bindings: watchdog: add description for UniPhier WDT controller

[Keiji Hayashibara]

Add uniphier-wdt dt-bindings documentation.

Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>
---
 .../devicetree/bindings/watchdog/uniphier-wdt.txt    | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt

diff --git a/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt b/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
new file mode 100644
index 0000000..bf63375
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
@@ -0,0 +1,20 @@
+UniPhier watchdog timer controller
+
+This UniPhier watchdog timer controller must be under sysctrl node.
+
+Required properties:
+- compatible: should be "socionext,uniphier-wdt"
+
+Example:
+
+	sysctrl@61840000 {
+		compatible = "socionext,uniphier-ld11-sysctrl",
+			     "simple-mfd", "syscon";
+		reg = <0x61840000 0x4000>;
+
+		watchdog {
+			compatible = "socionext,uniphier-wdt";
+		}
+
+		other nodes ...
+	};
-- 
2.7.4

Re: [PATCH V4 1/3] dt-bindings: watchdog: add description for UniPhier WDT controller

[Rob Herring]

On Wed, Jun 14, 2017 at 04:53:43PM +0900, Keiji Hayashibara wrote:
> Add uniphier-wdt dt-bindings documentation.
> 
> Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>
> ---
>  .../devicetree/bindings/watchdog/uniphier-wdt.txt    | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH V4 1/3] dt-bindings: watchdog: add description for UniPhier WDT controller

[Guenter Roeck]

On Wed, Jun 14, 2017 at 04:53:43PM +0900, Keiji Hayashibara wrote:
> Add uniphier-wdt dt-bindings documentation.
> 
> Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  .../devicetree/bindings/watchdog/uniphier-wdt.txt    | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt b/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
> new file mode 100644
> index 0000000..bf63375
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
> @@ -0,0 +1,20 @@
> +UniPhier watchdog timer controller
> +
> +This UniPhier watchdog timer controller must be under sysctrl node.
> +
> +Required properties:
> +- compatible: should be "socionext,uniphier-wdt"
> +
> +Example:
> +
> +	sysctrl@61840000 {
> +		compatible = "socionext,uniphier-ld11-sysctrl",
> +			     "simple-mfd", "syscon";
> +		reg = <0x61840000 0x4000>;
> +
> +		watchdog {
> +			compatible = "socionext,uniphier-wdt";
> +		}
> +
> +		other nodes ...
> +	};
> -- 
> 2.7.4
> 
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[PATCH V4 2/3] watchdog: uniphier: add UniPhier watchdog driver

[Keiji Hayashibara]

Add a watchdog driver for Socionext UniPhier series SoC.
Note that the timeout value for this device must be a power
of 2 because of the specification.

Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>
---
 Documentation/watchdog/watchdog-parameters.txt |   6 +
 drivers/watchdog/Kconfig                       |  12 ++
 drivers/watchdog/Makefile                      |   1 +
 drivers/watchdog/uniphier_wdt.c                | 268 +++++++++++++++++++++++++
 4 files changed, 287 insertions(+)
 create mode 100644 drivers/watchdog/uniphier_wdt.c

diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
index 4f7d86d..6f9d7b4 100644
--- a/Documentation/watchdog/watchdog-parameters.txt
+++ b/Documentation/watchdog/watchdog-parameters.txt
@@ -369,6 +369,12 @@ timeout: Watchdog timeout in seconds. (0<timeout<N, default=60)
 nowayout: Watchdog cannot be stopped once started
 	(default=kernel config parameter)
 -------------------------------------------------
+uniphier_wdt:
+timeout: Watchdog timeout in power of two seconds.
+	(1 <= timeout <= 128, default=64)
+nowayout: Watchdog cannot be stopped once started
+	(default=kernel config parameter)
+-------------------------------------------------
 w83627hf_wdt:
 wdt_io: w83627hf/thf WDT io port (default 0x2E)
 timeout: Watchdog timeout in seconds. 1 <= timeout <= 255, default=60.
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 52a70ee..b83759d 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -744,6 +744,18 @@ config ZX2967_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called zx2967_wdt.
 
+config UNIPHIER_WATCHDOG
+	tristate "UniPhier watchdog support"
+	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on OF && MFD_SYSCON
+	select WATCHDOG_CORE
+	help
+	  Say Y here to include support watchdog timer embedded
+	  into the UniPhier system.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called uniphier_wdt.
+
 # AVR32 Architecture
 
 config AT32AP700X_WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index a2126e2..0928dac 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o
 obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o
 obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
 obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o
+obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
 
 # AVR32 Architecture
 obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/uniphier_wdt.c b/drivers/watchdog/uniphier_wdt.c
new file mode 100644
index 0000000..0ea2339
--- /dev/null
+++ b/drivers/watchdog/uniphier_wdt.c
@@ -0,0 +1,268 @@
+/*
+ * Watchdog driver for the UniPhier watchdog timer
+ *
+ * (c) Copyright 2014 Panasonic Corporation
+ * (c) Copyright 2016 Socionext Inc.
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * 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/bitops.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>
+
+/* WDT timer setting register */
+#define WDTTIMSET			0x3004
+#define   WDTTIMSET_PERIOD_MASK		(0xf << 0)
+#define   WDTTIMSET_PERIOD_1_SEC	(0x3 << 0)
+
+/* WDT reset selection register */
+#define WDTRSTSEL			0x3008
+#define   WDTRSTSEL_RSTSEL_MASK		(0x3 << 0)
+#define   WDTRSTSEL_RSTSEL_BOTH		(0x0 << 0)
+#define   WDTRSTSEL_RSTSEL_IRQ_ONLY	(0x2 << 0)
+
+/* WDT control register */
+#define WDTCTRL				0x300c
+#define   WDTCTRL_STATUS		BIT(8)
+#define   WDTCTRL_CLEAR			BIT(1)
+#define   WDTCTRL_ENABLE		BIT(0)
+
+#define SEC_TO_WDTTIMSET_PRD(sec) \
+		(ilog2(sec) + WDTTIMSET_PERIOD_1_SEC)
+
+#define WDTST_TIMEOUT			1000 /* usec */
+
+#define WDT_DEFAULT_TIMEOUT		64   /* Default is 64 seconds */
+#define WDT_PERIOD_MIN			1
+#define WDT_PERIOD_MAX			128
+
+static unsigned int timeout = 0;
+static bool nowayout = WATCHDOG_NOWAYOUT;
+
+struct uniphier_wdt_dev {
+	struct watchdog_device wdt_dev;
+	struct regmap	*regmap;
+};
+
+/*
+ * UniPhier Watchdog operations
+ */
+static int uniphier_watchdog_ping(struct watchdog_device *w)
+{
+	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
+	unsigned int val;
+	int ret;
+
+	/* Clear counter */
+	ret = regmap_write_bits(wdev->regmap, WDTCTRL,
+				WDTCTRL_CLEAR, WDTCTRL_CLEAR);
+	if (!ret)
+		/*
+		 * As SoC specification, after clear counter,
+		 * it needs to wait until counter status is 1.
+		 */
+		ret = regmap_read_poll_timeout(wdev->regmap, WDTCTRL, val,
+					       (val & WDTCTRL_STATUS),
+					       0, WDTST_TIMEOUT);
+
+	return ret;
+}
+
+static int __uniphier_watchdog_start(struct regmap *regmap, unsigned int sec)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read_poll_timeout(regmap, WDTCTRL, val,
+				       !(val & WDTCTRL_STATUS),
+				       0, WDTST_TIMEOUT);
+	if (ret)
+		return ret;
+
+	/* Setup period */
+	ret = regmap_write(regmap, WDTTIMSET,
+			   SEC_TO_WDTTIMSET_PRD(sec));
+	if (ret)
+		return ret;
+
+	/* Enable and clear watchdog */
+	ret = regmap_write(regmap, WDTCTRL, WDTCTRL_ENABLE | WDTCTRL_CLEAR);
+	if (!ret)
+		/*
+		 * As SoC specification, after clear counter,
+		 * it needs to wait until counter status is 1.
+		 */
+		ret = regmap_read_poll_timeout(regmap, WDTCTRL, val,
+					       (val & WDTCTRL_STATUS),
+					       0, WDTST_TIMEOUT);
+
+	return ret;
+}
+
+static int __uniphier_watchdog_stop(struct regmap *regmap)
+{
+	/* Disable and stop watchdog */
+	return regmap_write_bits(regmap, WDTCTRL, WDTCTRL_ENABLE, 0);
+}
+
+static int __uniphier_watchdog_restart(struct regmap *regmap, unsigned int sec)
+{
+	int ret;
+
+	ret = __uniphier_watchdog_stop(regmap);
+	if (ret)
+		return ret;
+
+	return __uniphier_watchdog_start(regmap, sec);
+}
+
+static int uniphier_watchdog_start(struct watchdog_device *w)
+{
+	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
+	unsigned int tmp_timeout;
+
+	tmp_timeout = roundup_pow_of_two(w->timeout);
+
+	return __uniphier_watchdog_start(wdev->regmap, tmp_timeout);
+}
+
+static int uniphier_watchdog_stop(struct watchdog_device *w)
+{
+	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
+
+	return __uniphier_watchdog_stop(wdev->regmap);
+}
+
+static int uniphier_watchdog_set_timeout(struct watchdog_device *w,
+					 unsigned int t)
+{
+	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
+	unsigned int tmp_timeout;
+	int ret;
+
+	tmp_timeout = roundup_pow_of_two(t);
+	if (tmp_timeout == w->timeout)
+		return 0;
+
+	if (watchdog_active(w)) {
+		ret = __uniphier_watchdog_restart(wdev->regmap, tmp_timeout);
+		if (ret)
+			return ret;
+	}
+
+	w->timeout = tmp_timeout;
+
+	return 0;
+}
+
+/*
+ * Kernel Interfaces
+ */
+static const struct watchdog_info uniphier_wdt_info = {
+	.identity	= "uniphier-wdt",
+	.options	= WDIOF_SETTIMEOUT |
+			  WDIOF_KEEPALIVEPING |
+			  WDIOF_MAGICCLOSE |
+			  WDIOF_OVERHEAT,
+};
+
+static const struct watchdog_ops uniphier_wdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= uniphier_watchdog_start,
+	.stop		= uniphier_watchdog_stop,
+	.ping		= uniphier_watchdog_ping,
+	.set_timeout	= uniphier_watchdog_set_timeout,
+};
+
+static int uniphier_wdt_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct uniphier_wdt_dev *wdev;
+	struct regmap *regmap;
+	struct device_node *parent;
+	int ret;
+
+	wdev = devm_kzalloc(dev, sizeof(*wdev), GFP_KERNEL);
+	if (!wdev)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, wdev);
+
+	parent = of_get_parent(dev->of_node); /* parent should be syscon node */
+	regmap = syscon_node_to_regmap(parent);
+	of_node_put(parent);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	wdev->regmap = regmap;
+	wdev->wdt_dev.info = &uniphier_wdt_info;
+	wdev->wdt_dev.ops = &uniphier_wdt_ops;
+	wdev->wdt_dev.max_timeout = WDT_PERIOD_MAX;
+	wdev->wdt_dev.min_timeout = WDT_PERIOD_MIN;
+	wdev->wdt_dev.parent = dev;
+
+	if (watchdog_init_timeout(&wdev->wdt_dev, timeout, dev) < 0) {
+		wdev->wdt_dev.timeout = WDT_DEFAULT_TIMEOUT;
+	}
+	watchdog_set_nowayout(&wdev->wdt_dev, nowayout);
+	watchdog_stop_on_reboot(&wdev->wdt_dev);
+
+	watchdog_set_drvdata(&wdev->wdt_dev, wdev);
+
+	uniphier_watchdog_stop(&wdev->wdt_dev);
+	ret = regmap_write(wdev->regmap, WDTRSTSEL, WDTRSTSEL_RSTSEL_BOTH);
+	if (ret)
+		return ret;
+
+	ret = devm_watchdog_register_device(dev, &wdev->wdt_dev);
+	if (ret)
+		return ret;
+
+	dev_info(dev, "watchdog driver (timeout=%d sec, nowayout=%d)\n",
+		 wdev->wdt_dev.timeout, nowayout);
+
+	return 0;
+}
+
+static const struct of_device_id uniphier_wdt_dt_ids[] = {
+	{ .compatible = "socionext,uniphier-wdt" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, uniphier_wdt_dt_ids);
+
+static struct platform_driver uniphier_wdt_driver = {
+	.probe		= uniphier_wdt_probe,
+	.driver		= {
+		.name		= "uniphier-wdt",
+		.of_match_table	= uniphier_wdt_dt_ids,
+	},
+};
+
+module_platform_driver(uniphier_wdt_driver);
+
+module_param(timeout, uint, 0000);
+MODULE_PARM_DESC(timeout,
+	"Watchdog timeout seconds in power of 2. (0 < timeout < 128, default="
+				__MODULE_STRING(WDT_DEFAULT_TIMEOUT) ")");
+
+module_param(nowayout, bool, 0000);
+MODULE_PARM_DESC(nowayout,
+	"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
+MODULE_DESCRIPTION("UniPhier Watchdog Device Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

Re: [PATCH V4 2/3] watchdog: uniphier: add UniPhier watchdog driver

[Guenter Roeck]

On Wed, Jun 14, 2017 at 04:53:44PM +0900, Keiji Hayashibara wrote:
> Add a watchdog driver for Socionext UniPhier series SoC.
> Note that the timeout value for this device must be a power
> of 2 because of the specification.
> 
> Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  Documentation/watchdog/watchdog-parameters.txt |   6 +
>  drivers/watchdog/Kconfig                       |  12 ++
>  drivers/watchdog/Makefile                      |   1 +
>  drivers/watchdog/uniphier_wdt.c                | 268 +++++++++++++++++++++++++
>  4 files changed, 287 insertions(+)
>  create mode 100644 drivers/watchdog/uniphier_wdt.c
> 
> diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt
> index 4f7d86d..6f9d7b4 100644
> --- a/Documentation/watchdog/watchdog-parameters.txt
> +++ b/Documentation/watchdog/watchdog-parameters.txt
> @@ -369,6 +369,12 @@ timeout: Watchdog timeout in seconds. (0<timeout<N, default=60)
>  nowayout: Watchdog cannot be stopped once started
>  	(default=kernel config parameter)
>  -------------------------------------------------
> +uniphier_wdt:
> +timeout: Watchdog timeout in power of two seconds.
> +	(1 <= timeout <= 128, default=64)
> +nowayout: Watchdog cannot be stopped once started
> +	(default=kernel config parameter)
> +-------------------------------------------------
>  w83627hf_wdt:
>  wdt_io: w83627hf/thf WDT io port (default 0x2E)
>  timeout: Watchdog timeout in seconds. 1 <= timeout <= 255, default=60.
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 52a70ee..b83759d 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -744,6 +744,18 @@ config ZX2967_WATCHDOG
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called zx2967_wdt.
>  
> +config UNIPHIER_WATCHDOG
> +	tristate "UniPhier watchdog support"
> +	depends on ARCH_UNIPHIER || COMPILE_TEST
> +	depends on OF && MFD_SYSCON
> +	select WATCHDOG_CORE
> +	help
> +	  Say Y here to include support watchdog timer embedded
> +	  into the UniPhier system.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called uniphier_wdt.
> +
>  # AVR32 Architecture
>  
>  config AT32AP700X_WDT
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index a2126e2..0928dac 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -84,6 +84,7 @@ obj-$(CONFIG_ATLAS7_WATCHDOG) += atlas7_wdt.o
>  obj-$(CONFIG_RENESAS_WDT) += renesas_wdt.o
>  obj-$(CONFIG_ASPEED_WATCHDOG) += aspeed_wdt.o
>  obj-$(CONFIG_ZX2967_WATCHDOG) += zx2967_wdt.o
> +obj-$(CONFIG_UNIPHIER_WATCHDOG) += uniphier_wdt.o
>  
>  # AVR32 Architecture
>  obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
> diff --git a/drivers/watchdog/uniphier_wdt.c b/drivers/watchdog/uniphier_wdt.c
> new file mode 100644
> index 0000000..0ea2339
> --- /dev/null
> +++ b/drivers/watchdog/uniphier_wdt.c
> @@ -0,0 +1,268 @@
> +/*
> + * Watchdog driver for the UniPhier watchdog timer
> + *
> + * (c) Copyright 2014 Panasonic Corporation
> + * (c) Copyright 2016 Socionext Inc.
> + * All rights reserved.
> + *
> + * 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.
> + *
> + * 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/bitops.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>
> +
> +/* WDT timer setting register */
> +#define WDTTIMSET			0x3004
> +#define   WDTTIMSET_PERIOD_MASK		(0xf << 0)
> +#define   WDTTIMSET_PERIOD_1_SEC	(0x3 << 0)
> +
> +/* WDT reset selection register */
> +#define WDTRSTSEL			0x3008
> +#define   WDTRSTSEL_RSTSEL_MASK		(0x3 << 0)
> +#define   WDTRSTSEL_RSTSEL_BOTH		(0x0 << 0)
> +#define   WDTRSTSEL_RSTSEL_IRQ_ONLY	(0x2 << 0)
> +
> +/* WDT control register */
> +#define WDTCTRL				0x300c
> +#define   WDTCTRL_STATUS		BIT(8)
> +#define   WDTCTRL_CLEAR			BIT(1)
> +#define   WDTCTRL_ENABLE		BIT(0)
> +
> +#define SEC_TO_WDTTIMSET_PRD(sec) \
> +		(ilog2(sec) + WDTTIMSET_PERIOD_1_SEC)
> +
> +#define WDTST_TIMEOUT			1000 /* usec */
> +
> +#define WDT_DEFAULT_TIMEOUT		64   /* Default is 64 seconds */
> +#define WDT_PERIOD_MIN			1
> +#define WDT_PERIOD_MAX			128
> +
> +static unsigned int timeout = 0;
> +static bool nowayout = WATCHDOG_NOWAYOUT;
> +
> +struct uniphier_wdt_dev {
> +	struct watchdog_device wdt_dev;
> +	struct regmap	*regmap;
> +};
> +
> +/*
> + * UniPhier Watchdog operations
> + */
> +static int uniphier_watchdog_ping(struct watchdog_device *w)
> +{
> +	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
> +	unsigned int val;
> +	int ret;
> +
> +	/* Clear counter */
> +	ret = regmap_write_bits(wdev->regmap, WDTCTRL,
> +				WDTCTRL_CLEAR, WDTCTRL_CLEAR);
> +	if (!ret)
> +		/*
> +		 * As SoC specification, after clear counter,
> +		 * it needs to wait until counter status is 1.
> +		 */
> +		ret = regmap_read_poll_timeout(wdev->regmap, WDTCTRL, val,
> +					       (val & WDTCTRL_STATUS),
> +					       0, WDTST_TIMEOUT);
> +
> +	return ret;
> +}
> +
> +static int __uniphier_watchdog_start(struct regmap *regmap, unsigned int sec)
> +{
> +	unsigned int val;
> +	int ret;
> +
> +	ret = regmap_read_poll_timeout(regmap, WDTCTRL, val,
> +				       !(val & WDTCTRL_STATUS),
> +				       0, WDTST_TIMEOUT);
> +	if (ret)
> +		return ret;
> +
> +	/* Setup period */
> +	ret = regmap_write(regmap, WDTTIMSET,
> +			   SEC_TO_WDTTIMSET_PRD(sec));
> +	if (ret)
> +		return ret;
> +
> +	/* Enable and clear watchdog */
> +	ret = regmap_write(regmap, WDTCTRL, WDTCTRL_ENABLE | WDTCTRL_CLEAR);
> +	if (!ret)
> +		/*
> +		 * As SoC specification, after clear counter,
> +		 * it needs to wait until counter status is 1.
> +		 */
> +		ret = regmap_read_poll_timeout(regmap, WDTCTRL, val,
> +					       (val & WDTCTRL_STATUS),
> +					       0, WDTST_TIMEOUT);
> +
> +	return ret;
> +}
> +
> +static int __uniphier_watchdog_stop(struct regmap *regmap)
> +{
> +	/* Disable and stop watchdog */
> +	return regmap_write_bits(regmap, WDTCTRL, WDTCTRL_ENABLE, 0);
> +}
> +
> +static int __uniphier_watchdog_restart(struct regmap *regmap, unsigned int sec)
> +{
> +	int ret;
> +
> +	ret = __uniphier_watchdog_stop(regmap);
> +	if (ret)
> +		return ret;
> +
> +	return __uniphier_watchdog_start(regmap, sec);
> +}
> +
> +static int uniphier_watchdog_start(struct watchdog_device *w)
> +{
> +	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
> +	unsigned int tmp_timeout;
> +
> +	tmp_timeout = roundup_pow_of_two(w->timeout);
> +
> +	return __uniphier_watchdog_start(wdev->regmap, tmp_timeout);
> +}
> +
> +static int uniphier_watchdog_stop(struct watchdog_device *w)
> +{
> +	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
> +
> +	return __uniphier_watchdog_stop(wdev->regmap);
> +}
> +
> +static int uniphier_watchdog_set_timeout(struct watchdog_device *w,
> +					 unsigned int t)
> +{
> +	struct uniphier_wdt_dev *wdev = watchdog_get_drvdata(w);
> +	unsigned int tmp_timeout;
> +	int ret;
> +
> +	tmp_timeout = roundup_pow_of_two(t);
> +	if (tmp_timeout == w->timeout)
> +		return 0;
> +
> +	if (watchdog_active(w)) {
> +		ret = __uniphier_watchdog_restart(wdev->regmap, tmp_timeout);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	w->timeout = tmp_timeout;
> +
> +	return 0;
> +}
> +
> +/*
> + * Kernel Interfaces
> + */
> +static const struct watchdog_info uniphier_wdt_info = {
> +	.identity	= "uniphier-wdt",
> +	.options	= WDIOF_SETTIMEOUT |
> +			  WDIOF_KEEPALIVEPING |
> +			  WDIOF_MAGICCLOSE |
> +			  WDIOF_OVERHEAT,
> +};
> +
> +static const struct watchdog_ops uniphier_wdt_ops = {
> +	.owner		= THIS_MODULE,
> +	.start		= uniphier_watchdog_start,
> +	.stop		= uniphier_watchdog_stop,
> +	.ping		= uniphier_watchdog_ping,
> +	.set_timeout	= uniphier_watchdog_set_timeout,
> +};
> +
> +static int uniphier_wdt_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct uniphier_wdt_dev *wdev;
> +	struct regmap *regmap;
> +	struct device_node *parent;
> +	int ret;
> +
> +	wdev = devm_kzalloc(dev, sizeof(*wdev), GFP_KERNEL);
> +	if (!wdev)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, wdev);
> +
> +	parent = of_get_parent(dev->of_node); /* parent should be syscon node */
> +	regmap = syscon_node_to_regmap(parent);
> +	of_node_put(parent);
> +	if (IS_ERR(regmap))
> +		return PTR_ERR(regmap);
> +
> +	wdev->regmap = regmap;
> +	wdev->wdt_dev.info = &uniphier_wdt_info;
> +	wdev->wdt_dev.ops = &uniphier_wdt_ops;
> +	wdev->wdt_dev.max_timeout = WDT_PERIOD_MAX;
> +	wdev->wdt_dev.min_timeout = WDT_PERIOD_MIN;
> +	wdev->wdt_dev.parent = dev;
> +
> +	if (watchdog_init_timeout(&wdev->wdt_dev, timeout, dev) < 0) {
> +		wdev->wdt_dev.timeout = WDT_DEFAULT_TIMEOUT;
> +	}
> +	watchdog_set_nowayout(&wdev->wdt_dev, nowayout);
> +	watchdog_stop_on_reboot(&wdev->wdt_dev);
> +
> +	watchdog_set_drvdata(&wdev->wdt_dev, wdev);
> +
> +	uniphier_watchdog_stop(&wdev->wdt_dev);
> +	ret = regmap_write(wdev->regmap, WDTRSTSEL, WDTRSTSEL_RSTSEL_BOTH);
> +	if (ret)
> +		return ret;
> +
> +	ret = devm_watchdog_register_device(dev, &wdev->wdt_dev);
> +	if (ret)
> +		return ret;
> +
> +	dev_info(dev, "watchdog driver (timeout=%d sec, nowayout=%d)\n",
> +		 wdev->wdt_dev.timeout, nowayout);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id uniphier_wdt_dt_ids[] = {
> +	{ .compatible = "socionext,uniphier-wdt" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, uniphier_wdt_dt_ids);
> +
> +static struct platform_driver uniphier_wdt_driver = {
> +	.probe		= uniphier_wdt_probe,
> +	.driver		= {
> +		.name		= "uniphier-wdt",
> +		.of_match_table	= uniphier_wdt_dt_ids,
> +	},
> +};
> +
> +module_platform_driver(uniphier_wdt_driver);
> +
> +module_param(timeout, uint, 0000);
> +MODULE_PARM_DESC(timeout,
> +	"Watchdog timeout seconds in power of 2. (0 < timeout < 128, default="
> +				__MODULE_STRING(WDT_DEFAULT_TIMEOUT) ")");
> +
> +module_param(nowayout, bool, 0000);
> +MODULE_PARM_DESC(nowayout,
> +	"Watchdog cannot be stopped once started (default="
> +				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> +
> +MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
> +MODULE_DESCRIPTION("UniPhier Watchdog Device Driver");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.7.4
> 

[PATCH V4 3/3] arm64: dts: uniphier: add watchdog node for LD11 and LD20

[Keiji Hayashibara]

Add nodes of watchdog timer for UniPhier LD11 and LD20 SoC.
The watchdog timer is included in sysctrl.

Signed-off-by: Keiji Hayashibara <hayashibara.keiji-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>
---
 arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi | 4 ++++
 arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi b/arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi
index da881f5..5fee3e3 100644
--- a/arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi
+++ b/arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi
@@ -393,6 +393,10 @@
 				compatible = "socionext,uniphier-ld11-reset";
 				#reset-cells = <1>;
 			};
+
+			watchdog {
+				compatible = "socionext,uniphier-wdt";
+			};
 		};
 	};
 };
diff --git a/arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi b/arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi
index a6b3a70..d4d82c8 100644
--- a/arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi
+++ b/arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi
@@ -417,6 +417,10 @@
 				compatible = "socionext,uniphier-ld20-reset";
 				#reset-cells = <1>;
 			};
+
+			watchdog {
+				compatible = "socionext,uniphier-wdt";
+			};
 		};
 	};
 };
-- 
2.7.4

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Re: [PATCH V4 3/3] arm64: dts: uniphier: add watchdog node for LD11 and LD20

[Masahiro Yamada]

2017-06-14 16:53 GMT+09:00 Keiji Hayashibara <hayashibara.keiji@socionext.com>:
> Add nodes of watchdog timer for UniPhier LD11 and LD20 SoC.
> The watchdog timer is included in sysctrl.
>
> Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>

Applied to linux-uniphier. Thanks!

-- 
Best Regards
Masahiro Yamada

RE: [PATCH V4 0/3] add UniPhier watchdog support

[Keiji Hayashibara]

Hi Guenter,

Let me confirm if I got it.

I guess that this series finished the review.
Could you tell me the current state of this series?

----------
Best Regards,
Keiji Hayashibara


> -----Original Message-----
> From: Keiji Hayashibara [mailto:hayashibara.keiji-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org]
> Sent: Wednesday, June 14, 2017 4:54 PM
> Subject: [PATCH V4 0/3] add UniPhier watchdog support
> 
> This series adds support for watchdog timer implemented on UniPhier LD11 and
> LD20 SoCs. This driver supports watchdog and system reset for SoCs.
> 
> patch V3
> http://www.spinics.net/lists/linux-watchdog/msg11889.html
> 
> patch V2
> http://www.spinics.net/lists/linux-watchdog/msg11852.html
> 
> patch V1
> http://www.spinics.net/lists/linux-watchdog/msg11782.html
> 
> 
> Changes between V4 and V3
> =========================
> 
>  * Add own dependencies to Kconfig.
> 
> Changes between V3 and V2
> =========================
> 
>  * Make it possible to take a timeout from devicetree.
>  * Sort #include headlers alphabetically.
>  * Correct the description of dt-bindings document and this patch comment.
>  * Correct the description of license as GPLv2.
>  * Correct MODULE_AUTHOR()
>  * Remove unnecessary code.
> 
> Changes between V2 and V1
> =========================
> 1. Add barrier code in uniphier_watchdog_ping() and __uniphier_watchdog_start().
> 2. Fix issues according to review comments.
> 
> Keiji Hayashibara (3):
>   dt-bindings: watchdog: add description for UniPhier WDT controller
>   watchdog: uniphier: add UniPhier watchdog driver
>   arm64: dts: uniphier: add watchdog node for LD11 and LD20
> 
>  .../devicetree/bindings/watchdog/uniphier-wdt.txt  |  20 ++
>  Documentation/watchdog/watchdog-parameters.txt     |   6 +
>  arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi   |   4 +
>  arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi   |   4 +
>  drivers/watchdog/Kconfig                           |  12 +
>  drivers/watchdog/Makefile                          |   1 +
>  drivers/watchdog/uniphier_wdt.c                    | 268 +++++++++++++++++++++
>  7 files changed, 315 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/uniphier-wdt.txt
>  create mode 100644 drivers/watchdog/uniphier_wdt.c
> 
> --
> 2.7.4



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Re: [PATCH V4 0/3] add UniPhier watchdog support

[Masahiro Yamada]

2017-07-05 19:06 GMT+09:00 Keiji Hayashibara <hayashibara.keiji@socionext.com>:
> Hi Guenter,
>
> Let me confirm if I got it.
>
> I guess that this series finished the review.
> Could you tell me the current state of this series?


I will pick up 3/3.  (It should have been sent to ARM-SoC ML, though.)

I had sent my PRs for v4.13 before Rob acked the DT binding.
Please look forward to v4.14.

-- 
Best Regards
Masahiro Yamada

Re: [PATCH V4 0/3] add UniPhier watchdog support

[Guenter Roeck]

On 07/05/2017 03:26 AM, Masahiro Yamada wrote:
> 2017-07-05 19:06 GMT+09:00 Keiji Hayashibara <hayashibara.keiji@socionext.com>:
>> Hi Guenter,
>>
>> Let me confirm if I got it.
>>
>> I guess that this series finished the review.
>> Could you tell me the current state of this series?
> 
> 
> I will pick up 3/3.  (It should have been sent to ARM-SoC ML, though.)
> 
> I had sent my PRs for v4.13 before Rob acked the DT binding.
> Please look forward to v4.14.
> 

1/3 and 2/3 are in -next, so they should be be included in Wim's pull request
for 4.13.

Guenter

RE: [PATCH V4 0/3] add UniPhier watchdog support

[Keiji Hayashibara]

Hi Guenter and Yamada-san,

I am grateful for your support.
Thank you.

----------
Best Regards,
Keiji Hayashibara


> From: Guenter Roeck [mailto:linux@roeck-us.net]
> Sent: Thursday, July 06, 2017 12:26 AM
> Subject: Re: [PATCH V4 0/3] add UniPhier watchdog support
> 
> On 07/05/2017 03:26 AM, Masahiro Yamada wrote:
> > 2017-07-05 19:06 GMT+09:00 Keiji Hayashibara <hayashibara.keiji@socionext.com>:
> >> Hi Guenter,
> >>
> >> Let me confirm if I got it.
> >>
> >> I guess that this series finished the review.
> >> Could you tell me the current state of this series?
> >
> >
> > I will pick up 3/3.  (It should have been sent to ARM-SoC ML, though.)
> >
> > I had sent my PRs for v4.13 before Rob acked the DT binding.
> > Please look forward to v4.14.
> >
> 
> 1/3 and 2/3 are in -next, so they should be be included in Wim's pull request
> for 4.13.
> 
> Guenter

Re: [PATCH V4 0/3] add UniPhier watchdog support

[Wim Van Sebroeck]

Hi All,

> On 07/05/2017 03:26 AM, Masahiro Yamada wrote:
> >2017-07-05 19:06 GMT+09:00 Keiji Hayashibara 
> ><hayashibara.keiji-uWyLwvC0a2jby3iVrkZq2A@public.gmane.org>:
> >>Hi Guenter,
> >>
> >>Let me confirm if I got it.
> >>
> >>I guess that this series finished the review.
> >>Could you tell me the current state of this series?
> >
> >
> >I will pick up 3/3.  (It should have been sent to ARM-SoC ML, though.)
> >
> >I had sent my PRs for v4.13 before Rob acked the DT binding.
> >Please look forward to v4.14.
> >
> 
> 1/3 and 2/3 are in -next, so they should be be included in Wim's pull 
> request
> for 4.13.

That's correct.

Kind regards,
Wim.

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