* [PATCH v5 0/2] Add WDT driver for Toshiba Visconti ARM SoC
@ 2020-10-05 2:30 Nobuhiro Iwamatsu
2020-10-05 2:30 ` [PATCH v5 1/2] watchdog: bindings: Add binding documentation for Toshiba Visconti watchdog device Nobuhiro Iwamatsu
2020-10-05 2:30 ` [PATCH v5 2/2] watchdog: Add Toshiba Visconti watchdog driver Nobuhiro Iwamatsu
0 siblings, 2 replies; 5+ messages in thread
From: Nobuhiro Iwamatsu @ 2020-10-05 2:30 UTC (permalink / raw)
To: Rob Herring, Wim Van Sebroeck, Guenter Roeck
Cc: punit1.agrawal, yuji2.ishikawa, devicetree, linux-arm-kernel,
linux-watchdog, Nobuhiro Iwamatsu
Hi,
This is the WDT driver for Toshiba's ARM SoC, Visconti[0].
This has not yet been included in Linux kernel, but patches have been posted [1]
and some patches have been applied [2].
Since this is a SoC driver, this cannot work by itself, but I have confirmed that it
works with the patch series sent as [1] with DT setting.
Best regards,
Nobuhiro
[0]: https://toshiba.semicon-storage.com/ap-en/semiconductor/product/image-recognition-processors-visconti.html
[1]: http://lists.infradead.org/pipermail/linux-arm-kernel/2020-September/599678.html
[2]: http://lists.infradead.org/pipermail/linux-arm-kernel/2020-September/600578.html
watchdog: bindings: Add binding documentation for Toshiba Visconti watchdog device
v4 - > v5:
- Add 'additionalProperties: false' property
- Add Reviewed-by: Rob Herring <robh@kernel.org>
v3 - > v4:
- Add timeout-sec property
- Add Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
v2 - > v3:
- no update
v1 - > v2:
- no update
watchdog: Add Toshiba Visconti watchdog driver
v4 - > v5:
- Add devm_add_action_or_reset().
v3 - > v4:
- Remove unnecessary include file.
- Drop unnecessary MODULE_AUTHOR.
- Add Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp>
v2 - > v3:
- Fix unnecessary split lines
- Fix negative value check and handling for visconti_wdt_get_timelef()
v1 - > v2:
- Sort incclude alphabetically.
- Add negative value check and handling for visconti_wdt_get_timelef()
- Use dev_err_probe() with devm_clk_get()
Nobuhiro Iwamatsu (2):
watchdog: bindings: Add binding documentation for Toshiba Visconti
watchdog device
watchdog: Add Toshiba Visconti watchdog driver
.../watchdog/toshiba,visconti-wdt.yaml | 54 +++++
drivers/watchdog/Kconfig | 8 +
drivers/watchdog/Makefile | 1 +
drivers/watchdog/visconti_wdt.c | 195 ++++++++++++++++++
4 files changed, 258 insertions(+)
create mode 100644 Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml
create mode 100644 drivers/watchdog/visconti_wdt.c
--
2.27.0
^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH v5 1/2] watchdog: bindings: Add binding documentation for Toshiba Visconti watchdog device 2020-10-05 2:30 [PATCH v5 0/2] Add WDT driver for Toshiba Visconti ARM SoC Nobuhiro Iwamatsu @ 2020-10-05 2:30 ` Nobuhiro Iwamatsu 2020-10-05 15:33 ` Guenter Roeck 2020-10-05 2:30 ` [PATCH v5 2/2] watchdog: Add Toshiba Visconti watchdog driver Nobuhiro Iwamatsu 1 sibling, 1 reply; 5+ messages in thread From: Nobuhiro Iwamatsu @ 2020-10-05 2:30 UTC (permalink / raw) To: Rob Herring, Wim Van Sebroeck, Guenter Roeck Cc: punit1.agrawal, yuji2.ishikawa, devicetree, linux-arm-kernel, linux-watchdog, Nobuhiro Iwamatsu, Rob Herring Add documentation for the binding of Toshiba Visconti SoC's watchdog. Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp> Reviewed-by: Rob Herring <robh@kernel.org> --- .../watchdog/toshiba,visconti-wdt.yaml | 54 +++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml diff --git a/Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml new file mode 100644 index 000000000000..690e19ce4b87 --- /dev/null +++ b/Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml @@ -0,0 +1,54 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +# Copyright 2020 Toshiba Electronic Devices & Storage Corporation +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/watchdog/toshiba,visconti-wdt.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: Toshiba Visconti SoCs PIUWDT Watchdog timer + +maintainers: + - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> + +allOf: + - $ref: watchdog.yaml# + +properties: + compatible: + enum: + - toshiba,visconti-wdt + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + timeout-sec: true + +required: + - compatible + - reg + - clocks + +additionalProperties: false + +examples: + - | + soc { + #address-cells = <2>; + #size-cells = <2>; + + wdt_clk: wdt-clk { + compatible = "fixed-clock"; + clock-frequency = <150000000>; + #clock-cells = <0>; + }; + + watchdog@28330000 { + compatible = "toshiba,visconti-wdt"; + reg = <0 0x28330000 0 0x1000>; + clocks = <&wdt_clk>; + timeout-sec = <20>; + }; + }; -- 2.27.0 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v5 1/2] watchdog: bindings: Add binding documentation for Toshiba Visconti watchdog device 2020-10-05 2:30 ` [PATCH v5 1/2] watchdog: bindings: Add binding documentation for Toshiba Visconti watchdog device Nobuhiro Iwamatsu @ 2020-10-05 15:33 ` Guenter Roeck 0 siblings, 0 replies; 5+ messages in thread From: Guenter Roeck @ 2020-10-05 15:33 UTC (permalink / raw) To: Nobuhiro Iwamatsu, Rob Herring, Wim Van Sebroeck Cc: punit1.agrawal, yuji2.ishikawa, devicetree, linux-arm-kernel, linux-watchdog, Rob Herring On 10/4/20 7:30 PM, Nobuhiro Iwamatsu wrote: > Add documentation for the binding of Toshiba Visconti SoC's watchdog. > > Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> > Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp> > Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > .../watchdog/toshiba,visconti-wdt.yaml | 54 +++++++++++++++++++ > 1 file changed, 54 insertions(+) > create mode 100644 Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml > > diff --git a/Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml > new file mode 100644 > index 000000000000..690e19ce4b87 > --- /dev/null > +++ b/Documentation/devicetree/bindings/watchdog/toshiba,visconti-wdt.yaml > @@ -0,0 +1,54 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +# Copyright 2020 Toshiba Electronic Devices & Storage Corporation > +%YAML 1.2 > +--- > +$id: "http://devicetree.org/schemas/watchdog/toshiba,visconti-wdt.yaml#" > +$schema: "http://devicetree.org/meta-schemas/core.yaml#" > + > +title: Toshiba Visconti SoCs PIUWDT Watchdog timer > + > +maintainers: > + - Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> > + > +allOf: > + - $ref: watchdog.yaml# > + > +properties: > + compatible: > + enum: > + - toshiba,visconti-wdt > + > + reg: > + maxItems: 1 > + > + clocks: > + maxItems: 1 > + > + timeout-sec: true > + > +required: > + - compatible > + - reg > + - clocks > + > +additionalProperties: false > + > +examples: > + - | > + soc { > + #address-cells = <2>; > + #size-cells = <2>; > + > + wdt_clk: wdt-clk { > + compatible = "fixed-clock"; > + clock-frequency = <150000000>; > + #clock-cells = <0>; > + }; > + > + watchdog@28330000 { > + compatible = "toshiba,visconti-wdt"; > + reg = <0 0x28330000 0 0x1000>; > + clocks = <&wdt_clk>; > + timeout-sec = <20>; > + }; > + }; > ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v5 2/2] watchdog: Add Toshiba Visconti watchdog driver 2020-10-05 2:30 [PATCH v5 0/2] Add WDT driver for Toshiba Visconti ARM SoC Nobuhiro Iwamatsu 2020-10-05 2:30 ` [PATCH v5 1/2] watchdog: bindings: Add binding documentation for Toshiba Visconti watchdog device Nobuhiro Iwamatsu @ 2020-10-05 2:30 ` Nobuhiro Iwamatsu 2020-10-05 15:33 ` Guenter Roeck 1 sibling, 1 reply; 5+ messages in thread From: Nobuhiro Iwamatsu @ 2020-10-05 2:30 UTC (permalink / raw) To: Rob Herring, Wim Van Sebroeck, Guenter Roeck Cc: punit1.agrawal, yuji2.ishikawa, devicetree, linux-arm-kernel, linux-watchdog, Nobuhiro Iwamatsu Add the watchdog driver for Toshiba Visconti series. Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp> --- drivers/watchdog/Kconfig | 8 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/visconti_wdt.c | 195 ++++++++++++++++++++++++++++++++ 3 files changed, 204 insertions(+) create mode 100644 drivers/watchdog/visconti_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index ab7aad5a1e69..0cb078ce5e9d 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1004,6 +1004,14 @@ config PM8916_WATCHDOG Say Y here to include support watchdog timer embedded into the pm8916 module. +config VISCONTI_WATCHDOG + tristate "Toshiba Visconti series watchdog support" + depends on ARCH_VISCONTI || COMPILE_TEST + select WATCHDOG_CORE + help + Say Y here to include support for the watchdog timer in Toshiba + Visconti SoCs. + # X86 (i386 + ia64 + x86_64) Architecture config ACQUIRE_WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 97bed1d3d97c..a7747e76fd29 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -95,6 +95,7 @@ obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o obj-$(CONFIG_PM8916_WATCHDOG) += pm8916_wdt.o obj-$(CONFIG_ARM_SMC_WATCHDOG) += arm_smc_wdt.o +obj-$(CONFIG_VISCONTI_WATCHDOG) += visconti_wdt.o # X86 (i386 + ia64 + x86_64) Architecture obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o diff --git a/drivers/watchdog/visconti_wdt.c b/drivers/watchdog/visconti_wdt.c new file mode 100644 index 000000000000..83ef55e66ca8 --- /dev/null +++ b/drivers/watchdog/visconti_wdt.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2020 TOSHIBA CORPORATION + * Copyright (c) 2020 Toshiba Electronic Devices & Storage Corporation + * Copyright (c) 2020 Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> + */ + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/watchdog.h> + +#define WDT_CNT 0x00 +#define WDT_MIN 0x04 +#define WDT_MAX 0x08 +#define WDT_CTL 0x0c +#define WDT_CMD 0x10 +#define WDT_CMD_CLEAR 0x4352 +#define WDT_CMD_START_STOP 0x5354 +#define WDT_DIV 0x30 + +#define VISCONTI_WDT_FREQ 2000000 /* 2MHz */ +#define WDT_DEFAULT_TIMEOUT 10U /* in seconds */ + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC( + nowayout, + "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT)")"); + +struct visconti_wdt_priv { + struct watchdog_device wdev; + void __iomem *base; + u32 div; +}; + +static int visconti_wdt_start(struct watchdog_device *wdev) +{ + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); + u32 timeout = wdev->timeout * VISCONTI_WDT_FREQ; + + writel(priv->div, priv->base + WDT_DIV); + writel(0, priv->base + WDT_MIN); + writel(timeout, priv->base + WDT_MAX); + writel(0, priv->base + WDT_CTL); + writel(WDT_CMD_START_STOP, priv->base + WDT_CMD); + + return 0; +} + +static int visconti_wdt_stop(struct watchdog_device *wdev) +{ + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); + + writel(1, priv->base + WDT_CTL); + writel(WDT_CMD_START_STOP, priv->base + WDT_CMD); + + return 0; +} + +static int visconti_wdt_ping(struct watchdog_device *wdd) +{ + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdd); + + writel(WDT_CMD_CLEAR, priv->base + WDT_CMD); + + return 0; +} + +static unsigned int visconti_wdt_get_timeleft(struct watchdog_device *wdev) +{ + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); + u32 timeout = wdev->timeout * VISCONTI_WDT_FREQ; + u32 cnt = readl(priv->base + WDT_CNT); + + if (timeout <= cnt) + return 0; + timeout -= cnt; + + return timeout / VISCONTI_WDT_FREQ; +} + +static int visconti_wdt_set_timeout(struct watchdog_device *wdev, unsigned int timeout) +{ + u32 val; + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); + + wdev->timeout = timeout; + val = wdev->timeout * VISCONTI_WDT_FREQ; + + /* Clear counter before setting timeout because WDT expires */ + writel(WDT_CMD_CLEAR, priv->base + WDT_CMD); + writel(val, priv->base + WDT_MAX); + + return 0; +} + +static const struct watchdog_info visconti_wdt_info = { + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, + .identity = "Visconti Watchdog", +}; + +static const struct watchdog_ops visconti_wdt_ops = { + .owner = THIS_MODULE, + .start = visconti_wdt_start, + .stop = visconti_wdt_stop, + .ping = visconti_wdt_ping, + .get_timeleft = visconti_wdt_get_timeleft, + .set_timeout = visconti_wdt_set_timeout, +}; + +static void visconti_clk_disable_unprepare(void *data) +{ + clk_disable_unprepare(data); +} + +static int visconti_wdt_probe(struct platform_device *pdev) +{ + struct watchdog_device *wdev; + struct visconti_wdt_priv *priv; + struct device *dev = &pdev->dev; + struct clk *clk; + int ret; + unsigned long clk_freq; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->base)) + return PTR_ERR(priv->base); + + clk = devm_clk_get(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), "Could not get clock\n"); + + ret = clk_prepare_enable(clk); + if (ret) { + dev_err(dev, "Could not enable clock\n"); + return ret; + } + + ret = devm_add_action_or_reset(dev, visconti_clk_disable_unprepare, clk); + if (ret) + return ret; + + clk_freq = clk_get_rate(clk); + if (!clk_freq) + return -EINVAL; + + priv->div = clk_freq / VISCONTI_WDT_FREQ; + + /* Initialize struct watchdog_device. */ + wdev = &priv->wdev; + wdev->info = &visconti_wdt_info; + wdev->ops = &visconti_wdt_ops; + wdev->parent = dev; + wdev->min_timeout = 1; + wdev->max_timeout = 0xffffffff / VISCONTI_WDT_FREQ; + wdev->timeout = min(wdev->max_timeout, WDT_DEFAULT_TIMEOUT); + + watchdog_set_drvdata(wdev, priv); + watchdog_set_nowayout(wdev, nowayout); + watchdog_stop_on_unregister(wdev); + + /* This overrides the default timeout only if DT configuration was found */ + ret = watchdog_init_timeout(wdev, 0, dev); + if (ret) + dev_warn(dev, "Specified timeout value invalid, using default\n"); + + return devm_watchdog_register_device(dev, wdev); +} + +static const struct of_device_id visconti_wdt_of_match[] = { + { .compatible = "toshiba,visconti-wdt", }, + {} +}; +MODULE_DEVICE_TABLE(of, visconti_wdt_of_match); + +static struct platform_driver visconti_wdt_driver = { + .driver = { + .name = "visconti_wdt", + .of_match_table = visconti_wdt_of_match, + }, + .probe = visconti_wdt_probe, +}; +module_platform_driver(visconti_wdt_driver); + +MODULE_DESCRIPTION("TOSHIBA Visconti Watchdog Driver"); +MODULE_AUTHOR("Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp"); +MODULE_LICENSE("GPL v2"); -- 2.27.0 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v5 2/2] watchdog: Add Toshiba Visconti watchdog driver 2020-10-05 2:30 ` [PATCH v5 2/2] watchdog: Add Toshiba Visconti watchdog driver Nobuhiro Iwamatsu @ 2020-10-05 15:33 ` Guenter Roeck 0 siblings, 0 replies; 5+ messages in thread From: Guenter Roeck @ 2020-10-05 15:33 UTC (permalink / raw) To: Nobuhiro Iwamatsu, Rob Herring, Wim Van Sebroeck Cc: punit1.agrawal, yuji2.ishikawa, devicetree, linux-arm-kernel, linux-watchdog On 10/4/20 7:30 PM, Nobuhiro Iwamatsu wrote: > Add the watchdog driver for Toshiba Visconti series. > > Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> > Reviewed-by: Punit Agrawal <punit1.agrawal@toshiba.co.jp> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > drivers/watchdog/Kconfig | 8 ++ > drivers/watchdog/Makefile | 1 + > drivers/watchdog/visconti_wdt.c | 195 ++++++++++++++++++++++++++++++++ > 3 files changed, 204 insertions(+) > create mode 100644 drivers/watchdog/visconti_wdt.c > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig > index ab7aad5a1e69..0cb078ce5e9d 100644 > --- a/drivers/watchdog/Kconfig > +++ b/drivers/watchdog/Kconfig > @@ -1004,6 +1004,14 @@ config PM8916_WATCHDOG > Say Y here to include support watchdog timer embedded into the > pm8916 module. > > +config VISCONTI_WATCHDOG > + tristate "Toshiba Visconti series watchdog support" > + depends on ARCH_VISCONTI || COMPILE_TEST > + select WATCHDOG_CORE > + help > + Say Y here to include support for the watchdog timer in Toshiba > + Visconti SoCs. > + > # X86 (i386 + ia64 + x86_64) Architecture > > config ACQUIRE_WDT > diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile > index 97bed1d3d97c..a7747e76fd29 100644 > --- a/drivers/watchdog/Makefile > +++ b/drivers/watchdog/Makefile > @@ -95,6 +95,7 @@ obj-$(CONFIG_RTD119X_WATCHDOG) += rtd119x_wdt.o > obj-$(CONFIG_SPRD_WATCHDOG) += sprd_wdt.o > obj-$(CONFIG_PM8916_WATCHDOG) += pm8916_wdt.o > obj-$(CONFIG_ARM_SMC_WATCHDOG) += arm_smc_wdt.o > +obj-$(CONFIG_VISCONTI_WATCHDOG) += visconti_wdt.o > > # X86 (i386 + ia64 + x86_64) Architecture > obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o > diff --git a/drivers/watchdog/visconti_wdt.c b/drivers/watchdog/visconti_wdt.c > new file mode 100644 > index 000000000000..83ef55e66ca8 > --- /dev/null > +++ b/drivers/watchdog/visconti_wdt.c > @@ -0,0 +1,195 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2020 TOSHIBA CORPORATION > + * Copyright (c) 2020 Toshiba Electronic Devices & Storage Corporation > + * Copyright (c) 2020 Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> > + */ > + > +#include <linux/clk.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/watchdog.h> > + > +#define WDT_CNT 0x00 > +#define WDT_MIN 0x04 > +#define WDT_MAX 0x08 > +#define WDT_CTL 0x0c > +#define WDT_CMD 0x10 > +#define WDT_CMD_CLEAR 0x4352 > +#define WDT_CMD_START_STOP 0x5354 > +#define WDT_DIV 0x30 > + > +#define VISCONTI_WDT_FREQ 2000000 /* 2MHz */ > +#define WDT_DEFAULT_TIMEOUT 10U /* in seconds */ > + > +static bool nowayout = WATCHDOG_NOWAYOUT; > +module_param(nowayout, bool, 0); > +MODULE_PARM_DESC( > + nowayout, > + "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT)")"); > + > +struct visconti_wdt_priv { > + struct watchdog_device wdev; > + void __iomem *base; > + u32 div; > +}; > + > +static int visconti_wdt_start(struct watchdog_device *wdev) > +{ > + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); > + u32 timeout = wdev->timeout * VISCONTI_WDT_FREQ; > + > + writel(priv->div, priv->base + WDT_DIV); > + writel(0, priv->base + WDT_MIN); > + writel(timeout, priv->base + WDT_MAX); > + writel(0, priv->base + WDT_CTL); > + writel(WDT_CMD_START_STOP, priv->base + WDT_CMD); > + > + return 0; > +} > + > +static int visconti_wdt_stop(struct watchdog_device *wdev) > +{ > + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); > + > + writel(1, priv->base + WDT_CTL); > + writel(WDT_CMD_START_STOP, priv->base + WDT_CMD); > + > + return 0; > +} > + > +static int visconti_wdt_ping(struct watchdog_device *wdd) > +{ > + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdd); > + > + writel(WDT_CMD_CLEAR, priv->base + WDT_CMD); > + > + return 0; > +} > + > +static unsigned int visconti_wdt_get_timeleft(struct watchdog_device *wdev) > +{ > + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); > + u32 timeout = wdev->timeout * VISCONTI_WDT_FREQ; > + u32 cnt = readl(priv->base + WDT_CNT); > + > + if (timeout <= cnt) > + return 0; > + timeout -= cnt; > + > + return timeout / VISCONTI_WDT_FREQ; > +} > + > +static int visconti_wdt_set_timeout(struct watchdog_device *wdev, unsigned int timeout) > +{ > + u32 val; > + struct visconti_wdt_priv *priv = watchdog_get_drvdata(wdev); > + > + wdev->timeout = timeout; > + val = wdev->timeout * VISCONTI_WDT_FREQ; > + > + /* Clear counter before setting timeout because WDT expires */ > + writel(WDT_CMD_CLEAR, priv->base + WDT_CMD); > + writel(val, priv->base + WDT_MAX); > + > + return 0; > +} > + > +static const struct watchdog_info visconti_wdt_info = { > + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING, > + .identity = "Visconti Watchdog", > +}; > + > +static const struct watchdog_ops visconti_wdt_ops = { > + .owner = THIS_MODULE, > + .start = visconti_wdt_start, > + .stop = visconti_wdt_stop, > + .ping = visconti_wdt_ping, > + .get_timeleft = visconti_wdt_get_timeleft, > + .set_timeout = visconti_wdt_set_timeout, > +}; > + > +static void visconti_clk_disable_unprepare(void *data) > +{ > + clk_disable_unprepare(data); > +} > + > +static int visconti_wdt_probe(struct platform_device *pdev) > +{ > + struct watchdog_device *wdev; > + struct visconti_wdt_priv *priv; > + struct device *dev = &pdev->dev; > + struct clk *clk; > + int ret; > + unsigned long clk_freq; > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + > + priv->base = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(priv->base)) > + return PTR_ERR(priv->base); > + > + clk = devm_clk_get(dev, NULL); > + if (IS_ERR(clk)) > + return dev_err_probe(dev, PTR_ERR(clk), "Could not get clock\n"); > + > + ret = clk_prepare_enable(clk); > + if (ret) { > + dev_err(dev, "Could not enable clock\n"); > + return ret; > + } > + > + ret = devm_add_action_or_reset(dev, visconti_clk_disable_unprepare, clk); > + if (ret) > + return ret; > + > + clk_freq = clk_get_rate(clk); > + if (!clk_freq) > + return -EINVAL; > + > + priv->div = clk_freq / VISCONTI_WDT_FREQ; > + > + /* Initialize struct watchdog_device. */ > + wdev = &priv->wdev; > + wdev->info = &visconti_wdt_info; > + wdev->ops = &visconti_wdt_ops; > + wdev->parent = dev; > + wdev->min_timeout = 1; > + wdev->max_timeout = 0xffffffff / VISCONTI_WDT_FREQ; > + wdev->timeout = min(wdev->max_timeout, WDT_DEFAULT_TIMEOUT); > + > + watchdog_set_drvdata(wdev, priv); > + watchdog_set_nowayout(wdev, nowayout); > + watchdog_stop_on_unregister(wdev); > + > + /* This overrides the default timeout only if DT configuration was found */ > + ret = watchdog_init_timeout(wdev, 0, dev); > + if (ret) > + dev_warn(dev, "Specified timeout value invalid, using default\n"); > + > + return devm_watchdog_register_device(dev, wdev); > +} > + > +static const struct of_device_id visconti_wdt_of_match[] = { > + { .compatible = "toshiba,visconti-wdt", }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, visconti_wdt_of_match); > + > +static struct platform_driver visconti_wdt_driver = { > + .driver = { > + .name = "visconti_wdt", > + .of_match_table = visconti_wdt_of_match, > + }, > + .probe = visconti_wdt_probe, > +}; > +module_platform_driver(visconti_wdt_driver); > + > +MODULE_DESCRIPTION("TOSHIBA Visconti Watchdog Driver"); > +MODULE_AUTHOR("Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp"); > +MODULE_LICENSE("GPL v2"); > ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-10-05 15:35 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-10-05 2:30 [PATCH v5 0/2] Add WDT driver for Toshiba Visconti ARM SoC Nobuhiro Iwamatsu 2020-10-05 2:30 ` [PATCH v5 1/2] watchdog: bindings: Add binding documentation for Toshiba Visconti watchdog device Nobuhiro Iwamatsu 2020-10-05 15:33 ` Guenter Roeck 2020-10-05 2:30 ` [PATCH v5 2/2] watchdog: Add Toshiba Visconti watchdog driver Nobuhiro Iwamatsu 2020-10-05 15:33 ` Guenter Roeck
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