[PATCH v3 0/7] Removal of bcm63xx-wdt

[PATCH v3 0/7] Removal of bcm63xx-wdt

[Florian Fainelli]

This patch series prepares the bcm7038_wdt driver to support its bcm63xx
counter part, updates the MIPS BCM63xx platform code to provide the
necessary information about the "periph" clock, and finally proceeds
with removing the bcm63xx_wdt altogether.

This was only compiled tested as I did not have a readily available
BCM63xx system to test with.

This should also help with adding support for BCM4908 which Rafal is
working on.

Changes in v3:

- added Guenter's and Thomas' tags to patch 6
- added missing initialization of id_table
- use Rafal's latest binding patch

Changes in v2:

- added Guenter's Reviewed-by where given
- update binding patch to pass make dt_bindings_check (Rob)

Florian Fainelli (6):
  dt-bindings: watchdog: Add BCM6345 compatible to BCM7038 binding
  watchdog: bcm7038_wdt: Support platform data configuration
  watchdog: Allow building BCM7038_WDT for BCM63XX
  watchdog: bcm7038_wdt: Add platform device id for bcm63xx-wdt
  MIPS: BCM63XX: Provide platform data to watchdog device
  watchdog: Remove BCM63XX_WDT

Rafał Miłecki (1):
  dt-bindings: watchdog: convert Broadcom's WDT to the json-schema

 .../bindings/watchdog/brcm,bcm7038-wdt.txt    |  19 --
 .../bindings/watchdog/brcm,bcm7038-wdt.yaml   |  42 +++
 arch/mips/bcm63xx/dev-wdt.c                   |   8 +
 drivers/watchdog/Kconfig                      |  15 +-
 drivers/watchdog/Makefile                     |   1 -
 drivers/watchdog/bcm63xx_wdt.c                | 315 ------------------
 drivers/watchdog/bcm7038_wdt.c                |  16 +-
 include/linux/platform_data/bcm7038_wdt.h     |   8 +
 8 files changed, 76 insertions(+), 348 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
 create mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
 delete mode 100644 drivers/watchdog/bcm63xx_wdt.c
 create mode 100644 include/linux/platform_data/bcm7038_wdt.h

-- 
2.25.1

[PATCH v3 1/7] dt-bindings: watchdog: convert Broadcom's WDT to the json-schema

[Florian Fainelli]

From: Rafał Miłecki <rafal@milecki.pl>

This helps validating DTS files.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
 .../bindings/watchdog/brcm,bcm7038-wdt.txt    | 19 ---------
 .../bindings/watchdog/brcm,bcm7038-wdt.yaml   | 40 +++++++++++++++++++
 2 files changed, 40 insertions(+), 19 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
 create mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
deleted file mode 100644
index 84122270be8f..000000000000
--- a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
+++ /dev/null
@@ -1,19 +0,0 @@
-BCM7038 Watchdog timer
-
-Required properties:
-
-- compatible : should be "brcm,bcm7038-wdt"
-- reg : Specifies base physical address and size of the registers.
-
-Optional properties:
-
-- clocks: The clock running the watchdog. If no clock is found the
-	  driver will default to 27000000 Hz.
-
-Example:
-
-watchdog@f040a7e8 {
-	compatible = "brcm,bcm7038-wdt";
-	clocks = <&upg_fixed>;
-	reg = <0xf040a7e8 0x16>;
-};
diff --git a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
new file mode 100644
index 000000000000..69e5a1ef6a1f
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/brcm,bcm63xx-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: BCM7038 watchdog timer
+
+allOf:
+  - $ref: "watchdog.yaml#"
+
+maintainers:
+  - Florian Fainelli <f.fainelli@gmail.com>
+  - Justin Chen <justinpopo6@gmail.com>
+  - Rafał Miłecki <rafal@milecki.pl>
+
+properties:
+  compatible:
+    const: brcm,bcm7038-wdt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: >
+      The clock running the watchdog. If no clock is found the driver will
+      default to 27000000 Hz.
+
+unevaluatedProperties: false
+
+required:
+  - reg
+
+examples:
+  - |
+    watchdog@f040a7e8 {
+      compatible = "brcm,bcm7038-wdt";
+      reg = <0xf040a7e8 0x16>;
+      clocks = <&upg_fixed>;
+    };
-- 
2.25.1

Re: [PATCH v3 1/7] dt-bindings: watchdog: convert Broadcom's WDT to the json-schema

[Rob Herring]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 1373 bytes --]

On Wed, 03 Nov 2021 16:13:21 -0700, Florian Fainelli wrote:
> From: Rafał Miłecki <rafal@milecki.pl>
> 
> This helps validating DTS files.
> 
> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> ---
>  .../bindings/watchdog/brcm,bcm7038-wdt.txt    | 19 ---------
>  .../bindings/watchdog/brcm,bcm7038-wdt.yaml   | 40 +++++++++++++++++++
>  2 files changed, 40 insertions(+), 19 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
>  create mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
./Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml: $id: relative path/filename doesn't match actual path or filename
	expected: http://devicetree.org/schemas/watchdog/brcm,bcm7038-wdt.yaml#

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/patch/1550624

This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit.

Re: [PATCH v3 1/7] dt-bindings: watchdog: convert Broadcom's WDT to the json-schema

[Guenter Roeck]

On 11/3/21 4:13 PM, Florian Fainelli wrote:
> From: Rafał Miłecki <rafal@milecki.pl>
> 
> This helps validating DTS files.
> 
> Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> ---
>   .../bindings/watchdog/brcm,bcm7038-wdt.txt    | 19 ---------
>   .../bindings/watchdog/brcm,bcm7038-wdt.yaml   | 40 +++++++++++++++++++
>   2 files changed, 40 insertions(+), 19 deletions(-)
>   delete mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
>   create mode 100644 Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
> deleted file mode 100644
> index 84122270be8f..000000000000
> --- a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
> +++ /dev/null
> @@ -1,19 +0,0 @@
> -BCM7038 Watchdog timer
> -
> -Required properties:
> -
> -- compatible : should be "brcm,bcm7038-wdt"
> -- reg : Specifies base physical address and size of the registers.
> -
> -Optional properties:
> -
> -- clocks: The clock running the watchdog. If no clock is found the
> -	  driver will default to 27000000 Hz.
> -
> -Example:
> -
> -watchdog@f040a7e8 {
> -	compatible = "brcm,bcm7038-wdt";
> -	clocks = <&upg_fixed>;
> -	reg = <0xf040a7e8 0x16>;
> -};
> diff --git a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
> new file mode 100644
> index 000000000000..69e5a1ef6a1f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/watchdog/brcm,bcm63xx-wdt.yaml#

Looks like this requires

s/63xx/7038/

Guenter

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: BCM7038 watchdog timer
> +
> +allOf:
> +  - $ref: "watchdog.yaml#"
> +
> +maintainers:
> +  - Florian Fainelli <f.fainelli@gmail.com>
> +  - Justin Chen <justinpopo6@gmail.com>
> +  - Rafał Miłecki <rafal@milecki.pl>
> +
> +properties:
> +  compatible:
> +    const: brcm,bcm7038-wdt
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description: >
> +      The clock running the watchdog. If no clock is found the driver will
> +      default to 27000000 Hz.
> +
> +unevaluatedProperties: false
> +
> +required:
> +  - reg
> +
> +examples:
> +  - |
> +    watchdog@f040a7e8 {
> +      compatible = "brcm,bcm7038-wdt";
> +      reg = <0xf040a7e8 0x16>;
> +      clocks = <&upg_fixed>;
> +    };
> 

[PATCH v3 2/7] dt-bindings: watchdog: Add BCM6345 compatible to BCM7038 binding

[Florian Fainelli]

The BCM7038 watchdog binding is updated to include a "brcm,bcm6345-wdt"
compatible string which is the first instance of a DSL (BCM63xx) SoC
seeing the integration of such a watchdog timer block.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 .../devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml      | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
index 69e5a1ef6a1f..12d64d4c719e 100644
--- a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.yaml
@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/watchdog/brcm,bcm63xx-wdt.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: BCM7038 watchdog timer
+title: BCM63xx and BCM7038 watchdog timer
 
 allOf:
   - $ref: "watchdog.yaml#"
@@ -16,7 +16,9 @@ maintainers:
 
 properties:
   compatible:
-    const: brcm,bcm7038-wdt
+    enum:
+      - brcm,bcm6345-wdt
+      - brcm,bcm7038-wdt
 
   reg:
     maxItems: 1
-- 
2.25.1

[PATCH v3 3/7] watchdog: bcm7038_wdt: Support platform data configuration

[Florian Fainelli]

The BCM7038 watchdog driver needs to be able to obtain a specific clock
name on BCM63xx platforms which is the "periph" clock ticking at 50MHz.
make it possible to specify the clock name to obtain via platform data.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/watchdog/bcm7038_wdt.c            | 8 +++++++-
 include/linux/platform_data/bcm7038_wdt.h | 8 ++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/platform_data/bcm7038_wdt.h

diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
index acaaa0005d5b..506cd7ef9c77 100644
--- a/drivers/watchdog/bcm7038_wdt.c
+++ b/drivers/watchdog/bcm7038_wdt.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/platform_data/bcm7038_wdt.h>
 #include <linux/pm.h>
 #include <linux/watchdog.h>
 
@@ -133,8 +134,10 @@ static void bcm7038_clk_disable_unprepare(void *data)
 
 static int bcm7038_wdt_probe(struct platform_device *pdev)
 {
+	struct bcm7038_wdt_platform_data *pdata = pdev->dev.platform_data;
 	struct device *dev = &pdev->dev;
 	struct bcm7038_watchdog *wdt;
+	const char *clk_name = NULL;
 	int err;
 
 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
@@ -147,7 +150,10 @@ static int bcm7038_wdt_probe(struct platform_device *pdev)
 	if (IS_ERR(wdt->base))
 		return PTR_ERR(wdt->base);
 
-	wdt->clk = devm_clk_get(dev, NULL);
+	if (pdata && pdata->clk_name)
+		clk_name = pdata->clk_name;
+
+	wdt->clk = devm_clk_get(dev, clk_name);
 	/* If unable to get clock, use default frequency */
 	if (!IS_ERR(wdt->clk)) {
 		err = clk_prepare_enable(wdt->clk);
diff --git a/include/linux/platform_data/bcm7038_wdt.h b/include/linux/platform_data/bcm7038_wdt.h
new file mode 100644
index 000000000000..e18cfd9ec8f9
--- /dev/null
+++ b/include/linux/platform_data/bcm7038_wdt.h
@@ -0,0 +1,8 @@
+#ifndef __BCM7038_WDT_PDATA_H
+#define __BCM7038_WDT_PDATA_H
+
+struct bcm7038_wdt_platform_data {
+	const char *clk_name;
+};
+
+#endif /* __BCM7038_WDT_PDATA_H */
-- 
2.25.1

[PATCH v3 4/7] watchdog: Allow building BCM7038_WDT for BCM63XX

[Florian Fainelli]

CONFIG_BCM63XX denotes the legacy MIPS-based DSL SoCs which utilize the
same piece of hardware as a watchdog, make it possible to select that
driver for those platforms.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/watchdog/Kconfig | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index bf59faeb3de1..24a775dd2bf1 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1756,12 +1756,13 @@ config BCM7038_WDT
 	tristate "BCM7038 Watchdog"
 	select WATCHDOG_CORE
 	depends on HAS_IOMEM
-	depends on ARCH_BRCMSTB || BMIPS_GENERIC || COMPILE_TEST
+	depends on ARCH_BRCMSTB || BMIPS_GENERIC || BCM63XX || COMPILE_TEST
 	help
 	 Watchdog driver for the built-in hardware in Broadcom 7038 and
 	 later SoCs used in set-top boxes.  BCM7038 was made public
 	 during the 2004 CES, and since then, many Broadcom chips use this
-	 watchdog block, including some cable modem chips.
+	 watchdog block, including some cable modem chips and DSL (63xx)
+	 chips.
 
 config IMGPDC_WDT
 	tristate "Imagination Technologies PDC Watchdog Timer"
-- 
2.25.1

[PATCH v3 5/7] watchdog: bcm7038_wdt: Add platform device id for bcm63xx-wdt

[Florian Fainelli]

In order to phase out bcm63xx_wdt and use bcm7038_wdt instead, introduce
a platform_device_id table that allows both names to be matched.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/watchdog/bcm7038_wdt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
index 506cd7ef9c77..a8a0e8485125 100644
--- a/drivers/watchdog/bcm7038_wdt.c
+++ b/drivers/watchdog/bcm7038_wdt.c
@@ -223,8 +223,16 @@ static const struct of_device_id bcm7038_wdt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, bcm7038_wdt_match);
 
+static const struct platform_device_id bcm7038_wdt_devtype[] = {
+	{ .name = "bcm7038-wdt" },
+	{ .name = "bcm63xx-wdt" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(platform, bcm7038_wdt_devtype);
+
 static struct platform_driver bcm7038_wdt_driver = {
 	.probe		= bcm7038_wdt_probe,
+	.id_table	= bcm7038_wdt_devtype,
 	.driver		= {
 		.name		= "bcm7038-wdt",
 		.of_match_table	= bcm7038_wdt_match,
-- 
2.25.1

[PATCH v3 6/7] MIPS: BCM63XX: Provide platform data to watchdog device

[Florian Fainelli]

In order to utilize the bcm7038_wdt.c driver which needs to know the
clock name to obtain, pass it via platform data using the
bcm7038_wdt_platform_data structure.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 arch/mips/bcm63xx/dev-wdt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/mips/bcm63xx/dev-wdt.c b/arch/mips/bcm63xx/dev-wdt.c
index 2a2346a99bcb..42130914a3c2 100644
--- a/arch/mips/bcm63xx/dev-wdt.c
+++ b/arch/mips/bcm63xx/dev-wdt.c
@@ -9,6 +9,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
+#include <linux/platform_data/bcm7038_wdt.h>
 #include <bcm63xx_cpu.h>
 
 static struct resource wdt_resources[] = {
@@ -19,11 +20,18 @@ static struct resource wdt_resources[] = {
 	},
 };
 
+static struct bcm7038_wdt_platform_data bcm63xx_wdt_pdata = {
+	.clk_name	= "periph",
+};
+
 static struct platform_device bcm63xx_wdt_device = {
 	.name		= "bcm63xx-wdt",
 	.id		= -1,
 	.num_resources	= ARRAY_SIZE(wdt_resources),
 	.resource	= wdt_resources,
+	.dev		= {
+		.platform_data = &bcm63xx_wdt_pdata,
+	},
 };
 
 int __init bcm63xx_wdt_register(void)
-- 
2.25.1

[PATCH v3 7/7] watchdog: Remove BCM63XX_WDT

[Florian Fainelli]

Now that we can utilize the BCM7038_WDT driver, remove that one which
was not converted to the watchdog APIs. There are a couple of notable
differences with how the bcm7038_wdt driver proceeds:

- bcm63xx_wdt would register with the ad-hoc BCM63xx hardware timer API,
  but this would only be used in order to catch the interrupt *before* a
  SoC reset and make the kernel "die"

- bcm6xx_wdt would register a software timer and kick it every second in
  order to pet the watchdog, thus offering a two step watchdog process.
  This is not something that is brought over to the bcm7038_wdt as it is
  deemed unnecessary. If user-space cannot pet the watchdog, but a
  kernel timer can, the system is still in a bad shape anyway.

bcm7038_wdt is simpler in its behavior and behaves as a standard
watchdog driver and is not making use of any specific platform APIs,
therefore making it more maintainable and extensible.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/watchdog/Kconfig       |  10 --
 drivers/watchdog/Makefile      |   1 -
 drivers/watchdog/bcm63xx_wdt.c | 315 ---------------------------------
 3 files changed, 326 deletions(-)
 delete mode 100644 drivers/watchdog/bcm63xx_wdt.c

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 24a775dd2bf1..acebf9caf6d1 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1709,16 +1709,6 @@ config OCTEON_WDT
 	  from the first interrupt, it is then only poked when the
 	  device is written.
 
-config BCM63XX_WDT
-	tristate "Broadcom BCM63xx hardware watchdog"
-	depends on BCM63XX
-	help
-	  Watchdog driver for the built in watchdog hardware in Broadcom
-	  BCM63xx SoC.
-
-	  To compile this driver as a loadable module, choose M here.
-	  The module will be called bcm63xx_wdt.
-
 config BCM2835_WDT
 	tristate "Broadcom BCM2835 hardware watchdog"
 	depends on ARCH_BCM2835 || (OF && COMPILE_TEST)
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 1bd2d6f37c53..9811c4b1cd16 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -154,7 +154,6 @@ obj-$(CONFIG_XILINX_WATCHDOG) += of_xilinx_wdt.o
 # MIPS Architecture
 obj-$(CONFIG_ATH79_WDT) += ath79_wdt.o
 obj-$(CONFIG_BCM47XX_WDT) += bcm47xx_wdt.o
-obj-$(CONFIG_BCM63XX_WDT) += bcm63xx_wdt.o
 obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
 obj-$(CONFIG_INDYDOG) += indydog.o
 obj-$(CONFIG_JZ4740_WDT) += jz4740_wdt.o
diff --git a/drivers/watchdog/bcm63xx_wdt.c b/drivers/watchdog/bcm63xx_wdt.c
deleted file mode 100644
index 7cdb25363ea0..000000000000
--- a/drivers/watchdog/bcm63xx_wdt.c
+++ /dev/null
@@ -1,315 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- *  Broadcom BCM63xx SoC watchdog driver
- *
- *  Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
- *  Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
- *
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/uaccess.h>
-#include <linux/watchdog.h>
-#include <linux/timer.h>
-#include <linux/jiffies.h>
-#include <linux/interrupt.h>
-#include <linux/ptrace.h>
-#include <linux/resource.h>
-#include <linux/platform_device.h>
-
-#include <bcm63xx_cpu.h>
-#include <bcm63xx_io.h>
-#include <bcm63xx_regs.h>
-#include <bcm63xx_timer.h>
-
-#define PFX KBUILD_MODNAME
-
-#define WDT_HZ		50000000 /* Fclk */
-#define WDT_DEFAULT_TIME	30      /* seconds */
-#define WDT_MAX_TIME		256     /* seconds */
-
-static struct {
-	void __iomem *regs;
-	struct timer_list timer;
-	unsigned long inuse;
-	atomic_t ticks;
-} bcm63xx_wdt_device;
-
-static int expect_close;
-
-static int wdt_time = WDT_DEFAULT_TIME;
-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) ")");
-
-/* HW functions */
-static void bcm63xx_wdt_hw_start(void)
-{
-	bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
-	bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
-	bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
-}
-
-static void bcm63xx_wdt_hw_stop(void)
-{
-	bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
-	bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
-}
-
-static void bcm63xx_wdt_isr(void *data)
-{
-	struct pt_regs *regs = get_irq_regs();
-
-	die(PFX " fire", regs);
-}
-
-static void bcm63xx_timer_tick(struct timer_list *unused)
-{
-	if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
-		bcm63xx_wdt_hw_start();
-		mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
-	} else
-		pr_crit("watchdog will restart system\n");
-}
-
-static void bcm63xx_wdt_pet(void)
-{
-	atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
-}
-
-static void bcm63xx_wdt_start(void)
-{
-	bcm63xx_wdt_pet();
-	bcm63xx_timer_tick(0);
-}
-
-static void bcm63xx_wdt_pause(void)
-{
-	del_timer_sync(&bcm63xx_wdt_device.timer);
-	bcm63xx_wdt_hw_stop();
-}
-
-static int bcm63xx_wdt_settimeout(int new_time)
-{
-	if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
-		return -EINVAL;
-
-	wdt_time = new_time;
-
-	return 0;
-}
-
-static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
-{
-	if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
-		return -EBUSY;
-
-	bcm63xx_wdt_start();
-	return stream_open(inode, file);
-}
-
-static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
-{
-	if (expect_close == 42)
-		bcm63xx_wdt_pause();
-	else {
-		pr_crit("Unexpected close, not stopping watchdog!\n");
-		bcm63xx_wdt_start();
-	}
-	clear_bit(0, &bcm63xx_wdt_device.inuse);
-	expect_close = 0;
-	return 0;
-}
-
-static ssize_t bcm63xx_wdt_write(struct file *file, const char *data,
-				size_t len, loff_t *ppos)
-{
-	if (len) {
-		if (!nowayout) {
-			size_t i;
-
-			/* In case it was set long ago */
-			expect_close = 0;
-
-			for (i = 0; i != len; i++) {
-				char c;
-				if (get_user(c, data + i))
-					return -EFAULT;
-				if (c == 'V')
-					expect_close = 42;
-			}
-		}
-		bcm63xx_wdt_pet();
-	}
-	return len;
-}
-
-static struct watchdog_info bcm63xx_wdt_info = {
-	.identity       = PFX,
-	.options        = WDIOF_SETTIMEOUT |
-				WDIOF_KEEPALIVEPING |
-				WDIOF_MAGICCLOSE,
-};
-
-
-static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
-				unsigned long arg)
-{
-	void __user *argp = (void __user *)arg;
-	int __user *p = argp;
-	int new_value, retval = -EINVAL;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user(argp, &bcm63xx_wdt_info,
-			sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0;
-
-	case WDIOC_GETSTATUS:
-	case WDIOC_GETBOOTSTATUS:
-		return put_user(0, p);
-
-	case WDIOC_SETOPTIONS:
-		if (get_user(new_value, p))
-			return -EFAULT;
-
-		if (new_value & WDIOS_DISABLECARD) {
-			bcm63xx_wdt_pause();
-			retval = 0;
-		}
-		if (new_value & WDIOS_ENABLECARD) {
-			bcm63xx_wdt_start();
-			retval = 0;
-		}
-
-		return retval;
-
-	case WDIOC_KEEPALIVE:
-		bcm63xx_wdt_pet();
-		return 0;
-
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_value, p))
-			return -EFAULT;
-
-		if (bcm63xx_wdt_settimeout(new_value))
-			return -EINVAL;
-
-		bcm63xx_wdt_pet();
-
-	case WDIOC_GETTIMEOUT:
-		return put_user(wdt_time, p);
-
-	default:
-		return -ENOTTY;
-
-	}
-}
-
-static const struct file_operations bcm63xx_wdt_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.write		= bcm63xx_wdt_write,
-	.unlocked_ioctl	= bcm63xx_wdt_ioctl,
-	.compat_ioctl	= compat_ptr_ioctl,
-	.open		= bcm63xx_wdt_open,
-	.release	= bcm63xx_wdt_release,
-};
-
-static struct miscdevice bcm63xx_wdt_miscdev = {
-	.minor	= WATCHDOG_MINOR,
-	.name	= "watchdog",
-	.fops	= &bcm63xx_wdt_fops,
-};
-
-
-static int bcm63xx_wdt_probe(struct platform_device *pdev)
-{
-	int ret;
-	struct resource *r;
-
-	timer_setup(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0);
-
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		dev_err(&pdev->dev, "failed to get resources\n");
-		return -ENODEV;
-	}
-
-	bcm63xx_wdt_device.regs = devm_ioremap(&pdev->dev, r->start,
-							resource_size(r));
-	if (!bcm63xx_wdt_device.regs) {
-		dev_err(&pdev->dev, "failed to remap I/O resources\n");
-		return -ENXIO;
-	}
-
-	ret = bcm63xx_timer_register(TIMER_WDT_ID, bcm63xx_wdt_isr, NULL);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to register wdt timer isr\n");
-		return ret;
-	}
-
-	if (bcm63xx_wdt_settimeout(wdt_time)) {
-		bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
-		dev_info(&pdev->dev,
-			": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
-			wdt_time);
-	}
-
-	ret = misc_register(&bcm63xx_wdt_miscdev);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to register watchdog device\n");
-		goto unregister_timer;
-	}
-
-	dev_info(&pdev->dev, " started, timer margin: %d sec\n",
-						WDT_DEFAULT_TIME);
-
-	return 0;
-
-unregister_timer:
-	bcm63xx_timer_unregister(TIMER_WDT_ID);
-	return ret;
-}
-
-static int bcm63xx_wdt_remove(struct platform_device *pdev)
-{
-	if (!nowayout)
-		bcm63xx_wdt_pause();
-
-	misc_deregister(&bcm63xx_wdt_miscdev);
-	bcm63xx_timer_unregister(TIMER_WDT_ID);
-	return 0;
-}
-
-static void bcm63xx_wdt_shutdown(struct platform_device *pdev)
-{
-	bcm63xx_wdt_pause();
-}
-
-static struct platform_driver bcm63xx_wdt_driver = {
-	.probe	= bcm63xx_wdt_probe,
-	.remove = bcm63xx_wdt_remove,
-	.shutdown = bcm63xx_wdt_shutdown,
-	.driver = {
-		.name = "bcm63xx-wdt",
-	}
-};
-
-module_platform_driver(bcm63xx_wdt_driver);
-
-MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
-MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
-MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:bcm63xx-wdt");
-- 
2.25.1