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dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Received: by mail.gandi.net (Postfix) with ESMTPSA id DBB85FF80B; Tue, 17 Sep 2024 17:00:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1726592458; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=66IEOlMYBjXfr78ZRXNtlQpxX4kJuoX5da9gc4SZg8E=; b=OFFkTlmoSK3zi8DUxKc2Z76fDZtLoOpf7XukNaAFzpovTy1ZBJmiaN10qrYscwrWJANKVa H37DJpMQFlf1C1qpwFiJDYeJYtL8LQ90I0KGxXM8OzpOtb5Vf+uaWio3mz/m9LK0snFmni pVUpLw3Q50X9GAIz2zpxjcLRjUGLRD9TSQCrIq4qQUs3YWv5Smia5512c9WRuveOtmDTX9 xm6KZEUT5FP4wL4Im+Y6JyGXgB8n1MV6N5Fshrp3fZcgHnbBM+3doLbuifVju5CNvHAM0D KC9J0ZPL14hM4M9BzpS67KdTe03zQIdum2uC68LTJjBlWrwBp1NqFSY2/0+jRA== From: Thomas Richard Date: Tue, 17 Sep 2024 19:00:50 +0200 Subject: [PATCH v2 4/5] watchdog: Congatec Board Controller watchdog timer driver Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240503-congatec-board-controller-v2-4-681511a01c8f@bootlin.com> References: <20240503-congatec-board-controller-v2-0-681511a01c8f@bootlin.com> In-Reply-To: <20240503-congatec-board-controller-v2-0-681511a01c8f@bootlin.com> To: Lee Jones , Linus Walleij , Bartosz Golaszewski , Andi Shyti , Wim Van Sebroeck , Guenter Roeck Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-watchdog@vger.kernel.org, thomas.petazzoni@bootlin.com, blake.vermeer@keysight.com, Thomas Richard X-Mailer: b4 0.12.0 X-GND-Sasl: thomas.richard@bootlin.com Add watchdog timer support for the Congatec Board Controller. Signed-off-by: Thomas Richard Acked-by: Guenter Roeck --- drivers/watchdog/Kconfig | 10 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/cgbc_wdt.c | 211 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 222 insertions(+) diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index bae1d97cce89..07b711fc8bb2 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1142,6 +1142,16 @@ config ALIM7101_WDT Most people will say N. +config CGBC_WDT + tristate "Congatec Board Controller Watchdog Timer" + depends on MFD_CGBC + select WATCHDOG_CORE + help + Enables watchdog timer support for the Congatec Board Controller. + + This driver can also be built as a module. If so, the module will be + called cgbc_wdt. + config EBC_C384_WDT tristate "WinSystems EBC-C384 Watchdog Timer" depends on (X86 || COMPILE_TEST) && HAS_IOPORT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index b51030f035a6..5aa66ba91346 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -106,6 +106,7 @@ obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o obj-$(CONFIG_ADVANTECH_EC_WDT) += advantech_ec_wdt.o obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o +obj-$(CONFIG_CGBC_WDT) += cgbc_wdt.o obj-$(CONFIG_EBC_C384_WDT) += ebc-c384_wdt.o obj-$(CONFIG_EXAR_WDT) += exar_wdt.o obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o diff --git a/drivers/watchdog/cgbc_wdt.c b/drivers/watchdog/cgbc_wdt.c new file mode 100644 index 000000000000..702b055ba6f4 --- /dev/null +++ b/drivers/watchdog/cgbc_wdt.c @@ -0,0 +1,211 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Congatec Board Controller watchdog driver + * + * Copyright (C) 2024 Bootlin + * Author: Thomas Richard + */ + +#include +#include +#include +#include +#include +#include + +#include + +#define CGBC_WDT_CMD_TRIGGER 0x27 +#define CGBC_WDT_CMD_INIT 0x28 +#define CGBC_WDT_DISABLE 0x00 + +#define CGBC_WDT_MODE_SINGLE_EVENT 0x02 + +#define CGBC_WDT_MIN_TIMEOUT 1 +#define CGBC_WDT_MAX_TIMEOUT ((U32_MAX >> 8) / 1000) + +#define CGBC_WDT_DEFAULT_TIMEOUT 30 +#define CGBC_WDT_DEFAULT_PRETIMEOUT 0 + +enum action { + ACTION_INT = 0, + ACTION_SMI, + ACTION_RESET, + ACTION_BUTTON, +}; + +static unsigned int timeout; +module_param(timeout, uint, 0); +MODULE_PARM_DESC(timeout, + "Watchdog timeout in seconds. (>=0, default=" + __MODULE_STRING(CGBC_WDT_DEFAULT_TIMEOUT) ")"); + +static unsigned int pretimeout = CGBC_WDT_DEFAULT_PRETIMEOUT; +module_param(pretimeout, uint, 0); +MODULE_PARM_DESC(pretimeout, + "Watchdog pretimeout in seconds. (>=0, default=" + __MODULE_STRING(CGBC_WDT_DEFAULT_PRETIMEOUT) ")"); + +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 cgbc_wdt_data { + struct cgbc_device_data *cgbc; + struct watchdog_device wdd; +}; + +struct cgbc_wdt_cmd_cfg { + u8 cmd; + u8 mode; + u8 action; + u8 timeout1[3]; + u8 timeout2[3]; + u8 reserved[3]; + u8 delay[3]; +} __packed; + +static_assert(sizeof(struct cgbc_wdt_cmd_cfg) == 15); + +static int cgbc_wdt_start(struct watchdog_device *wdd) +{ + struct cgbc_wdt_data *wdt_data = watchdog_get_drvdata(wdd); + struct cgbc_device_data *cgbc = wdt_data->cgbc; + unsigned int timeout1 = (wdd->timeout - wdd->pretimeout) * 1000; + unsigned int timeout2 = wdd->pretimeout * 1000; + u8 action; + + struct cgbc_wdt_cmd_cfg cmd_start = { + .cmd = CGBC_WDT_CMD_INIT, + .mode = CGBC_WDT_MODE_SINGLE_EVENT, + .timeout1[0] = (u8)timeout1, + .timeout1[1] = (u8)(timeout1 >> 8), + .timeout1[2] = (u8)(timeout1 >> 16), + .timeout2[0] = (u8)timeout2, + .timeout2[1] = (u8)(timeout2 >> 8), + .timeout2[2] = (u8)(timeout2 >> 16), + }; + + if (wdd->pretimeout) { + action = 2; + action |= ACTION_SMI << 2; + action |= ACTION_RESET << 4; + } else { + action = 1; + action |= ACTION_RESET << 2; + } + + cmd_start.action = action; + + return cgbc_command(cgbc, &cmd_start, sizeof(cmd_start), NULL, 0, NULL); +} + +static int cgbc_wdt_stop(struct watchdog_device *wdd) +{ + struct cgbc_wdt_data *wdt_data = watchdog_get_drvdata(wdd); + struct cgbc_device_data *cgbc = wdt_data->cgbc; + struct cgbc_wdt_cmd_cfg cmd_stop = { + .cmd = CGBC_WDT_CMD_INIT, + .mode = CGBC_WDT_DISABLE, + }; + + return cgbc_command(cgbc, &cmd_stop, sizeof(cmd_stop), NULL, 0, NULL); +} + +static int cgbc_wdt_keepalive(struct watchdog_device *wdd) +{ + struct cgbc_wdt_data *wdt_data = watchdog_get_drvdata(wdd); + struct cgbc_device_data *cgbc = wdt_data->cgbc; + u8 cmd_ping = CGBC_WDT_CMD_TRIGGER; + + return cgbc_command(cgbc, &cmd_ping, sizeof(cmd_ping), NULL, 0, NULL); +} + +static int cgbc_wdt_set_pretimeout(struct watchdog_device *wdd, + unsigned int pretimeout) +{ + wdd->pretimeout = pretimeout; + + if (watchdog_active(wdd)) + return cgbc_wdt_start(wdd); + + return 0; +} + +static int cgbc_wdt_set_timeout(struct watchdog_device *wdd, + unsigned int timeout) +{ + if (timeout < wdd->pretimeout) + wdd->pretimeout = 0; + + wdd->timeout = timeout; + + if (watchdog_active(wdd)) + return cgbc_wdt_start(wdd); + + return 0; +} + +static const struct watchdog_info cgbc_wdt_info = { + .identity = "CGBC Watchdog", + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE | WDIOF_PRETIMEOUT +}; + +static const struct watchdog_ops cgbc_wdt_ops = { + .owner = THIS_MODULE, + .start = cgbc_wdt_start, + .stop = cgbc_wdt_stop, + .ping = cgbc_wdt_keepalive, + .set_timeout = cgbc_wdt_set_timeout, + .set_pretimeout = cgbc_wdt_set_pretimeout, +}; + +static int cgbc_wdt_probe(struct platform_device *pdev) +{ + struct cgbc_device_data *cgbc = dev_get_drvdata(pdev->dev.parent); + struct device *dev = &pdev->dev; + struct cgbc_wdt_data *wdt_data; + struct watchdog_device *wdd; + + wdt_data = devm_kzalloc(dev, sizeof(*wdt_data), GFP_KERNEL); + if (!wdt_data) + return -ENOMEM; + + wdt_data->cgbc = cgbc; + wdd = &wdt_data->wdd; + wdd->parent = dev; + + wdd->info = &cgbc_wdt_info; + wdd->ops = &cgbc_wdt_ops; + wdd->max_timeout = CGBC_WDT_MAX_TIMEOUT; + wdd->min_timeout = CGBC_WDT_MIN_TIMEOUT; + + watchdog_set_drvdata(wdd, wdt_data); + watchdog_set_nowayout(wdd, nowayout); + + wdd->timeout = CGBC_WDT_DEFAULT_TIMEOUT; + watchdog_init_timeout(wdd, timeout, dev); + cgbc_wdt_set_pretimeout(wdd, pretimeout); + + platform_set_drvdata(pdev, wdt_data); + watchdog_stop_on_reboot(wdd); + watchdog_stop_on_unregister(wdd); + + return devm_watchdog_register_device(dev, wdd); +} + +static struct platform_driver cgbc_wdt_driver = { + .driver = { + .name = "cgbc-wdt", + }, + .probe = cgbc_wdt_probe, +}; + +module_platform_driver(cgbc_wdt_driver); + +MODULE_DESCRIPTION("Congatec Board Controller Watchdog Driver"); +MODULE_AUTHOR("Thomas Richard "); +MODULE_LICENSE("GPL");