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[60.250.196.139]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-724beeb83d4sm2812530b3a.40.2024.11.20.22.41.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Nov 2024 22:41:20 -0800 (PST) From: Ming Yu X-Google-Original-From: Ming Yu To: tmyu0@nuvoton.com, lee@kernel.org, linus.walleij@linaro.org, brgl@bgdev.pl, andi.shyti@kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wim@linux-watchdog.org, linux@roeck-us.net, jdelvare@suse.com, alexandre.belloni@bootlin.com Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-rtc@vger.kernel.org Subject: [PATCH v2 5/7] watchdog: Add Nuvoton NCT6694 WDT support Date: Thu, 21 Nov 2024 14:40:44 +0800 Message-Id: <20241121064046.3724726-6-tmyu0@nuvoton.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241121064046.3724726-1-tmyu0@nuvoton.com> References: <20241121064046.3724726-1-tmyu0@nuvoton.com> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This driver supports Watchdog timer functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu --- MAINTAINERS | 1 + drivers/watchdog/Kconfig | 11 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/nct6694_wdt.c | 277 +++++++++++++++++++++++++++++++++ 4 files changed, 290 insertions(+) create mode 100644 drivers/watchdog/nct6694_wdt.c diff --git a/MAINTAINERS b/MAINTAINERS index eb5d46825e71..496fe7d5a23f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16549,6 +16549,7 @@ F: drivers/gpio/gpio-nct6694.c F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c F: drivers/net/can/nct6694_canfd.c +F: drivers/watchdog/nct6694_wdt.c F: include/linux/mfd/nct6694.h NVIDIA (rivafb and nvidiafb) FRAMEBUFFER DRIVER diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 2333476a42c0..851c1f17712d 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -739,6 +739,17 @@ config MAX77620_WATCHDOG MAX77620 chips. To compile this driver as a module, choose M here: the module will be called max77620_wdt. +config NCT6694_WATCHDOG + tristate "Nuvoton NCT6694 watchdog support" + depends on MFD_NCT6694 + select WATCHDOG_CORE + help + If you say yes to this option, support will be included for Nuvoton + NCT6694, a USB device to watchdog timer. + + This driver can also be built as a module. If so, the module will + be called nct6694_wdt. + config IMX2_WDT tristate "IMX2+ Watchdog" depends on ARCH_MXC || ARCH_LAYERSCAPE || COMPILE_TEST diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 386d88d89fe5..8355893b4435 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -232,6 +232,7 @@ obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o obj-$(CONFIG_MAX77620_WATCHDOG) += max77620_wdt.o +obj-$(CONFIG_NCT6694_WATCHDOG) += nct6694_wdt.o obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o diff --git a/drivers/watchdog/nct6694_wdt.c b/drivers/watchdog/nct6694_wdt.c new file mode 100644 index 000000000000..7d2c8d5c6fa3 --- /dev/null +++ b/drivers/watchdog/nct6694_wdt.c @@ -0,0 +1,277 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 WDT driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define DRVNAME "nct6694-wdt" + +#define NCT6694_DEFAULT_TIMEOUT 10 +#define NCT6694_DEFAULT_PRETIMEOUT 0 + +/* Host interface */ +#define NCT6694_WDT_MOD 0x07 + +/* Message Channel*/ +/* Command 00h */ +#define NCT6694_WDT_CMD0_LEN 0x0F +#define NCT6694_WDT_CMD0_OFFSET(idx) (idx ? 0x0100 : 0x0000) /* OFFSET = SEL|CMD */ + +/* Command 01h */ +#define NCT6694_WDT_CMD1_LEN 0x08 +#define NCT6694_WDT_CMD1_OFFSET(idx) (idx ? 0x0101 : 0x0001) /* OFFSET = SEL|CMD */ + +static unsigned int timeout = NCT6694_DEFAULT_TIMEOUT; +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds"); + +static unsigned int pretimeout = NCT6694_DEFAULT_PRETIMEOUT; +module_param(pretimeout, int, 0); +MODULE_PARM_DESC(pretimeout, "Watchdog pre-timeout 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) ")"); + +enum { + NCT6694_ACTION_NONE = 0, + NCT6694_ACTION_SIRQ, + NCT6694_ACTION_GPO, +}; + +struct __packed nct6694_wdt_cmd0 { + __le32 pretimeout; + __le32 timeout; + u8 owner; + u8 scratch; + u8 control; + u8 status; + __le32 countdown; +}; + +struct __packed nct6694_wdt_cmd1 { + u32 wdt_cmd; + u32 reserved; +}; + +struct nct6694_wdt_data { + struct watchdog_device wdev; + struct device *dev; + struct nct6694 *nct6694; + struct mutex lock; + unsigned char *xmit_buf; + unsigned int wdev_idx; +}; + +static int nct6694_wdt_setting(struct watchdog_device *wdev, + u32 timeout_val, u8 timeout_act, + u32 pretimeout_val, u8 pretimeout_act) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694_wdt_cmd0 *buf = (struct nct6694_wdt_cmd0 *)data->xmit_buf; + struct nct6694 *nct6694 = data->nct6694; + unsigned int timeout_fmt, pretimeout_fmt; + + guard(mutex)(&data->lock); + + if (pretimeout_val == 0) + pretimeout_act = NCT6694_ACTION_NONE; + + timeout_fmt = (timeout_val * 1000) | (timeout_act << 24); + pretimeout_fmt = (pretimeout_val * 1000) | (pretimeout_act << 24); + + memset(buf, 0, NCT6694_WDT_CMD0_LEN); + buf->timeout = cpu_to_le32(timeout_fmt); + buf->pretimeout = cpu_to_le32(pretimeout_fmt); + + return nct6694_write_msg(nct6694, NCT6694_WDT_MOD, + NCT6694_WDT_CMD0_OFFSET(data->wdev_idx), + NCT6694_WDT_CMD0_LEN, buf); +} + +static int nct6694_wdt_start(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + int ret; + + ret = nct6694_wdt_setting(wdev, wdev->timeout, NCT6694_ACTION_GPO, + wdev->pretimeout, NCT6694_ACTION_GPO); + if (ret) + return ret; + + dev_info(data->dev, "Setting WDT(%d): timeout = %d, pretimeout = %d\n", + data->wdev_idx, wdev->timeout, wdev->pretimeout); + + return ret; +} + +static int nct6694_wdt_stop(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694_wdt_cmd1 *buf = (struct nct6694_wdt_cmd1 *)data->xmit_buf; + struct nct6694 *nct6694 = data->nct6694; + + guard(mutex)(&data->lock); + + memcpy(buf, "WDTC", 4); + buf->reserved = 0; + + return nct6694_write_msg(nct6694, NCT6694_WDT_MOD, + NCT6694_WDT_CMD1_OFFSET(data->wdev_idx), + NCT6694_WDT_CMD1_LEN, buf); +} + +static int nct6694_wdt_ping(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694_wdt_cmd1 *buf = (struct nct6694_wdt_cmd1 *)data->xmit_buf; + struct nct6694 *nct6694 = data->nct6694; + + guard(mutex)(&data->lock); + memcpy(buf, "WDTS", 4); + buf->reserved = 0; + + return nct6694_write_msg(nct6694, NCT6694_WDT_MOD, + NCT6694_WDT_CMD1_OFFSET(data->wdev_idx), + NCT6694_WDT_CMD1_LEN, buf); +} + +static int nct6694_wdt_set_timeout(struct watchdog_device *wdev, + unsigned int timeout) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + int ret; + + if (timeout < wdev->pretimeout) { + dev_warn(data->dev, "pretimeout < timeout. Setting to zero\n"); + wdev->pretimeout = 0; + } + + ret = nct6694_wdt_setting(wdev, timeout, NCT6694_ACTION_GPO, + wdev->pretimeout, NCT6694_ACTION_GPO); + if (ret) + return ret; + + wdev->timeout = timeout; + + return ret; +} + +static int nct6694_wdt_set_pretimeout(struct watchdog_device *wdev, + unsigned int pretimeout) +{ + int ret; + + ret = nct6694_wdt_setting(wdev, wdev->timeout, NCT6694_ACTION_GPO, + pretimeout, NCT6694_ACTION_GPO); + if (ret) + return ret; + + wdev->pretimeout = pretimeout; + + return ret; +} + +static unsigned int nct6694_wdt_get_time(struct watchdog_device *wdev) +{ + struct nct6694_wdt_data *data = watchdog_get_drvdata(wdev); + struct nct6694_wdt_cmd0 *buf = (struct nct6694_wdt_cmd0 *)data->xmit_buf; + struct nct6694 *nct6694 = data->nct6694; + unsigned int timeleft_ms; + int ret; + + guard(mutex)(&data->lock); + + ret = nct6694_read_msg(nct6694, NCT6694_WDT_MOD, + NCT6694_WDT_CMD0_OFFSET(data->wdev_idx), + NCT6694_WDT_CMD0_LEN, buf); + if (ret) + return ret; + + timeleft_ms = le32_to_cpu(buf->countdown); + + return timeleft_ms / 1000; +} + +static const struct watchdog_info nct6694_wdt_info = { + .options = WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE | + WDIOF_PRETIMEOUT, + .identity = DRVNAME, +}; + +static const struct watchdog_ops nct6694_wdt_ops = { + .owner = THIS_MODULE, + .start = nct6694_wdt_start, + .stop = nct6694_wdt_stop, + .set_timeout = nct6694_wdt_set_timeout, + .set_pretimeout = nct6694_wdt_set_pretimeout, + .get_timeleft = nct6694_wdt_get_time, + .ping = nct6694_wdt_ping, +}; + +static int nct6694_wdt_probe(struct platform_device *pdev) +{ + const struct mfd_cell *cell = mfd_get_cell(pdev); + struct device *dev = &pdev->dev; + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + struct nct6694_wdt_data *data; + struct watchdog_device *wdev; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->xmit_buf = devm_kcalloc(dev, NCT6694_MAX_PACKET_SZ, + sizeof(unsigned char), GFP_KERNEL); + if (!data->xmit_buf) + return -ENOMEM; + + data->dev = dev; + data->nct6694 = nct6694; + data->wdev_idx = cell->id; + + wdev = &data->wdev; + wdev->info = &nct6694_wdt_info; + wdev->ops = &nct6694_wdt_ops; + wdev->timeout = timeout; + wdev->pretimeout = pretimeout; + wdev->min_timeout = 1; + wdev->max_timeout = 255; + + mutex_init(&data->lock); + + platform_set_drvdata(pdev, data); + + /* Register watchdog timer device to WDT framework */ + watchdog_set_drvdata(&data->wdev, data); + watchdog_init_timeout(&data->wdev, timeout, dev); + watchdog_set_nowayout(&data->wdev, nowayout); + watchdog_stop_on_reboot(&data->wdev); + + return devm_watchdog_register_device(dev, &data->wdev); +} + +static struct platform_driver nct6694_wdt_driver = { + .driver = { + .name = DRVNAME, + }, + .probe = nct6694_wdt_probe, +}; + +module_platform_driver(nct6694_wdt_driver); + +MODULE_DESCRIPTION("USB-WDT driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL");