From: Michael Walle <michael@walle.cc>
To: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org,
linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: "Linus Walleij" <linus.walleij@linaro.org>,
"Bartosz Golaszewski" <bgolaszewski@baylibre.com>,
"Rob Herring" <robh+dt@kernel.org>,
"Jean Delvare" <jdelvare@suse.com>,
"Guenter Roeck" <linux@roeck-us.net>,
"Lee Jones" <lee.jones@linaro.org>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Wim Van Sebroeck" <wim@linux-watchdog.org>,
"Shawn Guo" <shawnguo@kernel.org>, "Li Yang" <leoyang.li@nxp.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Jason Cooper" <jason@lakedaemon.net>,
"Marc Zyngier" <maz@kernel.org>,
"Michael Walle" <michael@walle.cc>
Subject: [PATCH 08/18] watchdog: add support for sl28cpld watchdog
Date: Tue, 17 Mar 2020 21:50:07 +0100 [thread overview]
Message-ID: <20200317205017.28280-9-michael@walle.cc> (raw)
In-Reply-To: <20200317205017.28280-1-michael@walle.cc>
This adds support for the watchdog of the sl28cpld board management
controller. This is part of a multi-function device driver.
Signed-off-by: Michael Walle <michael@walle.cc>
---
drivers/watchdog/Kconfig | 11 ++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/sl28cpld_wdt.c | 238 ++++++++++++++++++++++++++++++++
3 files changed, 250 insertions(+)
create mode 100644 drivers/watchdog/sl28cpld_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 9ea2b43d4b01..c78b90ccc8cf 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -340,6 +340,17 @@ config MLX_WDT
To compile this driver as a module, choose M here: the
module will be called mlx-wdt.
+config SL28CPLD_WATCHDOG
+ tristate "Kontron sl28 watchdog"
+ depends on MFD_SL28CPLD
+ select WATCHDOG_CORE
+ help
+ Say Y here to include support for the watchdog timer
+ on the Kontron sl28 CPLD.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sl28cpld_wdt.
+
# ALPHA Architecture
# ARM Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 2ee352bf3372..060e2f895fe8 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -223,3 +223,4 @@ obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o
obj-$(CONFIG_MENZ069_WATCHDOG) += menz69_wdt.o
obj-$(CONFIG_RAVE_SP_WATCHDOG) += rave-sp-wdt.o
obj-$(CONFIG_STPMIC1_WATCHDOG) += stpmic1_wdt.o
+obj-$(CONFIG_SL28CPLD_WATCHDOG) += sl28cpld_wdt.o
diff --git a/drivers/watchdog/sl28cpld_wdt.c b/drivers/watchdog/sl28cpld_wdt.c
new file mode 100644
index 000000000000..5927b7ad0be4
--- /dev/null
+++ b/drivers/watchdog/sl28cpld_wdt.c
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SMARC-sAL28 Watchdog driver.
+ *
+ * Copyright 2019 Kontron Europe GmbH
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+
+/*
+ * Watchdog timer block registers.
+ */
+#define SL28CPLD_WDT_CTRL 0
+#define WDT_CTRL_EN BIT(0)
+#define WDT_CTRL_LOCK BIT(2)
+#define SL28CPLD_WDT_TIMEOUT 1
+#define SL28CPLD_WDT_KICK 2
+#define WDT_KICK_VALUE 0x6b
+#define SL28CPLD_WDT_COUNT 3
+
+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) ")");
+
+static int timeout;
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds");
+
+struct sl28cpld_wdt {
+ struct watchdog_device wdd;
+ struct regmap *regmap;
+ u32 offset;
+};
+
+static int sl28cpld_wdt_ping(struct watchdog_device *wdd)
+{
+ struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ return regmap_write(wdt->regmap, wdt->offset + SL28CPLD_WDT_KICK,
+ WDT_KICK_VALUE);
+}
+
+static int sl28cpld_wdt_start(struct watchdog_device *wdd)
+{
+ struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);
+ unsigned int val;
+
+ val = WDT_CTRL_EN;
+ if (nowayout)
+ val |= WDT_CTRL_LOCK;
+
+ return regmap_update_bits(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL,
+ val, val);
+}
+
+static int sl28cpld_wdt_stop(struct watchdog_device *wdd)
+{
+ struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ return regmap_update_bits(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL,
+ WDT_CTRL_EN, 0);
+}
+
+static unsigned int sl28cpld_wdt_status(struct watchdog_device *wdd)
+{
+ struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);
+ unsigned int status;
+ int ret;
+
+ ret = regmap_read(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL,
+ &status);
+ if (ret < 0)
+ return 0;
+
+ /* is the watchdog timer running? */
+ return (status & WDT_CTRL_EN) << WDOG_ACTIVE;
+}
+
+static unsigned int sl28cpld_wdt_get_timeleft(struct watchdog_device *wdd)
+{
+ struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(wdt->regmap, wdt->offset + SL28CPLD_WDT_COUNT, &val);
+ if (ret < 0)
+ return 0;
+
+ return val;
+}
+
+static int sl28cpld_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ int ret;
+ struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);
+
+ ret = regmap_write(wdt->regmap, wdt->offset + SL28CPLD_WDT_TIMEOUT,
+ timeout);
+ if (ret == 0)
+ wdd->timeout = timeout;
+
+ return ret;
+}
+
+static const struct watchdog_info sl28cpld_wdt_info = {
+ .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
+ .identity = "SMARC-sAL28 CPLD watchdog",
+};
+
+static struct watchdog_ops sl28cpld_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = sl28cpld_wdt_start,
+ .stop = sl28cpld_wdt_stop,
+ .status = sl28cpld_wdt_status,
+ .ping = sl28cpld_wdt_ping,
+ .set_timeout = sl28cpld_wdt_set_timeout,
+ .get_timeleft = sl28cpld_wdt_get_timeleft,
+};
+
+static int sl28cpld_wdt_locked(struct sl28cpld_wdt *wdt)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(wdt->regmap, wdt->offset + SL28CPLD_WDT_CTRL, &val);
+ if (ret < 0)
+ return ret;
+
+ return val & WDT_CTRL_LOCK;
+}
+
+static int sl28cpld_wdt_probe(struct platform_device *pdev)
+{
+ struct sl28cpld_wdt *wdt;
+ struct watchdog_device *wdd;
+ struct resource *res;
+ unsigned int val;
+ int ret;
+
+ wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
+ if (!wdt)
+ return -ENOMEM;
+
+ if (!pdev->dev.parent)
+ return -ENODEV;
+
+ wdt->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!wdt->regmap)
+ return -ENODEV;
+
+ res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+ if (res == NULL)
+ return -EINVAL;
+ wdt->offset = res->start;
+
+ /* initialize struct watchdog_device */
+ wdd = &wdt->wdd;
+ wdd->parent = &pdev->dev;
+ wdd->info = &sl28cpld_wdt_info;
+ wdd->ops = &sl28cpld_wdt_ops;
+ wdd->min_timeout = 1;
+ wdd->max_timeout = 255;
+
+ watchdog_set_drvdata(wdd, wdt);
+
+ /* if the watchdog is locked, we set nowayout to true */
+ ret = sl28cpld_wdt_locked(wdt);
+ if (ret < 0)
+ return ret;
+ if (ret)
+ nowayout = true;
+ watchdog_set_nowayout(wdd, nowayout);
+
+ /*
+ * Initial timeout value, can either be set by kernel parameter or by
+ * the device tree. If both are not given the current value is used.
+ */
+ watchdog_init_timeout(wdd, timeout, &pdev->dev);
+ if (wdd->timeout) {
+ sl28cpld_wdt_set_timeout(wdd, wdd->timeout);
+ } else {
+ ret = regmap_read(wdt->regmap,
+ wdt->offset + SL28CPLD_WDT_TIMEOUT, &val);
+ if (ret < 0)
+ return ret;
+ wdd->timeout = val;
+ }
+
+ ret = watchdog_register_device(wdd);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to register watchdog device\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, wdt);
+
+ dev_info(&pdev->dev, "CPLD watchdog: initial timeout %d sec%s\n",
+ wdd->timeout, nowayout ? ", nowayout" : "");
+
+ return 0;
+}
+
+static int sl28cpld_wdt_remove(struct platform_device *pdev)
+{
+ struct sl28cpld_wdt *wdt = platform_get_drvdata(pdev);
+
+ watchdog_unregister_device(&wdt->wdd);
+
+ return 0;
+}
+
+static void sl28cpld_wdt_shutdown(struct platform_device *pdev)
+{
+ struct sl28cpld_wdt *wdt = platform_get_drvdata(pdev);
+
+ sl28cpld_wdt_stop(&wdt->wdd);
+}
+
+static struct platform_driver sl28cpld_wdt_driver = {
+ .probe = sl28cpld_wdt_probe,
+ .remove = sl28cpld_wdt_remove,
+ .shutdown = sl28cpld_wdt_shutdown,
+ .driver = {
+ .name = "sl28cpld-wdt",
+ },
+};
+module_platform_driver(sl28cpld_wdt_driver);
+
+MODULE_DESCRIPTION("sl28cpld Watchdog Driver");
+MODULE_LICENSE("GPL");
--
2.20.1
next prev parent reply other threads:[~2020-03-17 20:51 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-17 20:49 [PATCH 00/18] Add support for Kontron sl28cpld Michael Walle
2020-03-17 20:50 ` [PATCH 01/18] include/linux/ioport.h: add helper to define REG resource constructs Michael Walle
2020-03-17 20:50 ` [PATCH 02/18] mfd: mfd-core: Don't overwrite the dma_mask of the child device Michael Walle
2020-03-17 20:50 ` [PATCH 03/18] mfd: mfd-core: match device tree node against reg property Michael Walle
2020-03-17 20:50 ` [PATCH 04/18] dt-bindings: mfd: Add bindings for sl28cpld Michael Walle
2020-03-30 22:35 ` Rob Herring
2020-03-31 7:40 ` Michael Walle
2020-03-17 20:50 ` [PATCH 05/18] mfd: Add support for Kontron sl28cpld management controller Michael Walle
2020-03-18 3:28 ` Guenter Roeck
2020-03-18 16:38 ` Michael Walle
2020-03-17 20:50 ` [PATCH 06/18] irqchip: add sl28cpld interrupt controller support Michael Walle
2020-03-18 16:53 ` Guenter Roeck
2020-03-18 17:06 ` Michael Walle
2020-03-18 20:35 ` Guenter Roeck
2020-03-17 20:50 ` [PATCH 07/18] dt-bindings: watchdog: Add bindings for sl28cpld watchdog Michael Walle
2020-03-17 20:50 ` Michael Walle [this message]
2020-03-18 3:17 ` [PATCH 08/18] watchdog: add support " Guenter Roeck
2020-03-17 20:50 ` [PATCH 09/18] dt-bindings: pwm: Add bindings for sl28cpld PWM controller Michael Walle
2020-03-17 20:50 ` [PATCH 10/18] pwm: add support " Michael Walle
2020-03-17 20:50 ` [PATCH 11/18] dt-bindings: gpio: Add bindings for sl28cpld GPIO controller Michael Walle
2020-03-17 20:50 ` [PATCH 12/18] gpio: add support for the " Michael Walle
2020-03-18 9:14 ` Bartosz Golaszewski
2020-03-18 12:45 ` Michael Walle
2020-03-25 11:50 ` Bartosz Golaszewski
2020-03-26 20:05 ` Michael Walle
2020-03-27 10:20 ` Linus Walleij
2020-03-27 15:28 ` Michael Walle
2020-03-27 19:01 ` Linus Walleij
2020-03-30 11:21 ` Bartosz Golaszewski
2020-03-30 11:48 ` Michael Walle
2020-03-28 12:04 ` Michael Walle
2020-03-28 17:20 ` Michael Walle
2020-03-17 20:50 ` [PATCH 13/18] dt-bindings: hwmon: Add bindings for sl28cpld hardware monitoring Michael Walle
2020-03-17 20:50 ` [PATCH 14/18] hwmon: add support for the sl28cpld hardware monitoring controller Michael Walle
2020-03-18 3:27 ` Guenter Roeck
2020-03-18 16:32 ` Michael Walle
2020-03-17 20:50 ` [PATCH 15/18] arm64: dts: freescale: sl28: enable sl28cpld Michael Walle
2020-03-17 20:50 ` [PATCH 16/18] arm64: dts: freescale: sl28: map GPIOs to input events Michael Walle
2020-03-17 20:50 ` [PATCH 17/18] arm64: dts: freescale: sl28: enable LED support Michael Walle
2020-03-17 20:50 ` [PATCH 18/18] arm64: dts: freescale: sl28: enable fan support Michael Walle
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