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Tue, 20 May 2025 13:02:35 -0700 (PDT) Received: from NB-GIGA003.letovo.school ([5.194.95.139]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b26eaf5a0d0sm8412340a12.14.2025.05.20.13.02.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 May 2025 13:02:35 -0700 (PDT) From: Alexey Charkov Date: Wed, 21 May 2025 00:01:44 +0400 Subject: [PATCH v4 4/4] watchdog: Add support for VIA/WonderMedia SoC watchdog functionality Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250521-vt8500-timer-updates-v4-4-2d4306a16ae4@gmail.com> References: <20250521-vt8500-timer-updates-v4-0-2d4306a16ae4@gmail.com> In-Reply-To: <20250521-vt8500-timer-updates-v4-0-2d4306a16ae4@gmail.com> To: Krzysztof Kozlowski , Daniel Lezcano , Thomas Gleixner , Rob Herring , Conor Dooley , Krzysztof Kozlowski , Wim Van Sebroeck , Guenter Roeck Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-watchdog@vger.kernel.org, Alexey Charkov X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1747771315; l=5323; i=alchark@gmail.com; s=20250416; h=from:subject:message-id; bh=qeLngx3703X+Z3T6OTmsiw5w/nGbO6F+UA6hRWuYz9Q=; b=E9764OMTvoClSJRuZ7a/FQ8x0MgaPIWF+b2u9p2Kz7GTxhjaJrF7IO8KAdCNGK8Pe5jJohMLN ZuEitiKIh3NDdywXAKwsst8un4CHZtcsI0DSGnvdnIblGrV0iZNwYlO X-Developer-Key: i=alchark@gmail.com; a=ed25519; pk=ltKbQzKLTJPiDgPtcHxdo+dzFthCCMtC3V9qf7+0rkc= VIA/WonderMedia SoCs can use their system timer's first channel as a watchdog device which will reset the system if the clocksource counter matches the value given in its match register 0 and if the watchdog function is enabled. Since the watchdog function is tightly coupled to the timer itself, it is implemented as an auxiliary device of the timer device Signed-off-by: Alexey Charkov --- MAINTAINERS | 1 + drivers/watchdog/Kconfig | 15 ++++++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/vt8500-wdt.c | 80 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 97 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 5362095240627f613638197fda275db6edc16cf7..97d1842625dbdf7fdca3556260662dab469ed091 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3447,6 +3447,7 @@ F: drivers/tty/serial/vt8500_serial.c F: drivers/video/fbdev/vt8500lcdfb.* F: drivers/video/fbdev/wm8505fb* F: drivers/video/fbdev/wmt_ge_rops.* +F: drivers/watchdog/vt8500-wdt.c F: include/linux/vt8500-timer.h ARM/ZYNQ ARCHITECTURE diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 0d8d37f712e8cfb4bf8156853baa13c23a57d6d9..8049ae630301a98123f97f6e3ee868bd3bf1534a 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -2003,6 +2003,21 @@ config PIC32_DMT To compile this driver as a loadable module, choose M here. The module will be called pic32-dmt. +config VT8500_WATCHDOG + tristate "VIA/WonderMedia VT8500 watchdog support" + depends on ARCH_VT8500 || COMPILE_TEST + select WATCHDOG_CORE + select AUXILIARY_BUS + help + VIA/WonderMedia SoCs can use their system timer as a hardware + watchdog, as long as the first timer channel is free from other + uses and respective function is enabled in its registers. To + make use of it, say Y here and ensure that the device tree + lists at least two interrupts for the VT8500 timer device. + + To compile this driver as a module, choose M here. + The module will be called vt8500-wdt. + # PARISC Architecture # POWERPC Architecture diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index c9482904bf870a085c7fce2a439ac5089b6e6fee..3072786bf226c357102be3734fe6e701f753d45b 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -101,6 +101,7 @@ obj-$(CONFIG_MSC313E_WATCHDOG) += msc313e_wdt.o obj-$(CONFIG_APPLE_WATCHDOG) += apple_wdt.o obj-$(CONFIG_SUNPLUS_WATCHDOG) += sunplus_wdt.o obj-$(CONFIG_MARVELL_GTI_WDT) += marvell_gti_wdt.o +obj-$(CONFIG_VT8500_WATCHDOG) += vt8500-wdt.o # X86 (i386 + ia64 + x86_64) Architecture obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o diff --git a/drivers/watchdog/vt8500-wdt.c b/drivers/watchdog/vt8500-wdt.c new file mode 100644 index 0000000000000000000000000000000000000000..54fe5ad7695de36f6b3c1d28e955f00bef00e9db --- /dev/null +++ b/drivers/watchdog/vt8500-wdt.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2025 Alexey Charkov +#include +#include +#include +#include +#include +#include +#include + +static int vt8500_watchdog_start(struct watchdog_device *wdd) +{ + struct vt8500_wdt_info *info = watchdog_get_drvdata(wdd); + u64 deadline = info->timer_next(wdd->timeout * VT8500_TIMER_HZ); + + writel((u32)deadline, info->wdt_match); + writel(TIMER_WD_EN, info->wdt_en); + return 0; +} + +static int vt8500_watchdog_stop(struct watchdog_device *wdd) +{ + struct vt8500_wdt_info *info = watchdog_get_drvdata(wdd); + + writel(0, info->wdt_en); + return 0; +} + +static const struct watchdog_ops vt8500_watchdog_ops = { + .start = vt8500_watchdog_start, + .stop = vt8500_watchdog_stop, +}; + +static const struct watchdog_info vt8500_watchdog_info = { + .identity = "VIA VT8500 watchdog", + .options = WDIOF_MAGICCLOSE | + WDIOF_KEEPALIVEPING | + WDIOF_SETTIMEOUT, +}; + +static int vt8500_wdt_probe(struct auxiliary_device *auxdev, + const struct auxiliary_device_id *id) +{ + struct vt8500_wdt_info *info; + struct watchdog_device *wdd; + + wdd = devm_kzalloc(&auxdev->dev, sizeof(*wdd), GFP_KERNEL); + if (!wdd) + return -ENOMEM; + + wdd->info = &vt8500_watchdog_info; + wdd->ops = &vt8500_watchdog_ops; + wdd->max_hw_heartbeat_ms = U32_MAX / (VT8500_TIMER_HZ / 1000); + wdd->parent = &auxdev->dev; + + info = container_of(auxdev, struct vt8500_wdt_info, auxdev); + watchdog_set_drvdata(wdd, info); + + return devm_watchdog_register_device(&auxdev->dev, wdd); +} + +static const struct auxiliary_device_id vt8500_wdt_ids[] = { + { .name = "timer_vt8500.vt8500-wdt" }, + {}, +}; + +MODULE_DEVICE_TABLE(auxiliary, my_auxiliary_id_table); + +static struct auxiliary_driver vt8500_wdt_driver = { + .name = "vt8500-wdt", + .probe = vt8500_wdt_probe, + .id_table = vt8500_wdt_ids, +}; +module_auxiliary_driver(vt8500_wdt_driver); + +MODULE_AUTHOR("Alexey Charkov "); +MODULE_DESCRIPTION("Driver for the VIA VT8500 watchdog timer"); +MODULE_LICENSE("GPL");