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bh=iTNc2fs+paG8g8wv0IEPzpme3SvoqEVu94xwCji+MGA=; b=IN1QfZM5KYGPlTrsGi0UKBAcUrtYm2KmQZc7Ds+5dc2GAjGU8uQcDG1RL7SMshvMOjyAS1 F7Yp8ULLRPXDOV5JyhTtZBQXQ8HwBvBkBG1fIdYyvpyq6kDhVDXEbdAScfI0gsyhcOmZn7 MAxsS75KwcNCONTDszdmZ+StZnL000E= From: Michael Walle 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 Subject: [PATCH v2 08/16] watchdog: add support for sl28cpld watchdog Date: Thu, 2 Apr 2020 22:36:48 +0200 Message-Id: <20200402203656.27047-9-michael@walle.cc> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200402203656.27047-1-michael@walle.cc> References: <20200402203656.27047-1-michael@walle.cc> MIME-Version: 1.0 X-Spamd-Bar: ++++++ X-Spam-Level: ****** X-Rspamd-Server: web X-Spam-Status: Yes, score=6.40 X-Spam-Score: 6.40 X-Rspamd-Queue-Id: 83A9123E2E X-Spamd-Result: default: False [6.40 / 15.00]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_MISSING_CHARSET(2.50)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; TAGGED_RCPT(0.00)[dt]; MIME_GOOD(-0.10)[text/plain]; BROKEN_CONTENT_TYPE(1.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[]; RCPT_COUNT_TWELVE(0.00)[24]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM(-0.00)[-0.169]; RCVD_COUNT_ZERO(0.00)[0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:31334, ipnet:2a02:810c:8000::/33, country:DE]; FREEMAIL_CC(0.00)[linaro.org,baylibre.com,kernel.org,suse.com,roeck-us.net,gmail.com,pengutronix.de,linux-watchdog.org,nxp.com,linutronix.de,lakedaemon.net,linuxfoundation.org,walle.cc]; SUSPICIOUS_RECIPS(1.50)[] X-Spam: Yes X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200402_133718_678258_A05C8FC9 X-CRM114-Status: GOOD ( 19.83 ) X-Spam-Score: -2.5 (--) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-2.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [2a01:4f8:151:8464:0:0:1:2 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marc Zyngier , Jean Delvare , Jason Cooper , Greg Kroah-Hartman , Shawn Guo , Linus Walleij , Li Yang , Bartosz Golaszewski , Michael Walle , Rob Herring , Thierry Reding , Mark Brown , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Thomas Gleixner , Wim Van Sebroeck , Lee Jones , Guenter Roeck Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 --- drivers/watchdog/Kconfig | 11 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/sl28cpld_wdt.c | 242 ++++++++++++++++++++++++++++++++ 3 files changed, 254 insertions(+) create mode 100644 drivers/watchdog/sl28cpld_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 0663c604bd64..6c53c1d0f348 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 6de2e4ceef19..b9ecdf2d7347 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -224,3 +224,4 @@ 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..79a7e36217a6 --- /dev/null +++ b/drivers/watchdog/sl28cpld_wdt.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sl28cpld watchdog driver. + * + * Copyright 2019 Kontron Europe GmbH + */ + +#include +#include +#include +#include +#include +#include + +/* + * Watchdog timer block registers. + */ +#define WDT_CTRL 0x00 +#define WDT_CTRL_EN BIT(0) +#define WDT_CTRL_LOCK BIT(2) +#define WDT_CTRL_ASSERT_SYS_RESET BIT(6) +#define WDT_CTRL_ASSERT_WDT_TIMEOUT BIT(7) +#define WDT_TIMEOUT 0x01 +#define WDT_KICK 0x02 +#define WDT_KICK_VALUE 0x6b +#define WDT_COUNT 0x03 + +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; + bool assert_wdt_timeout; +}; + +static int sl28cpld_wdt_ping(struct watchdog_device *wdd) +{ + struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd); + + return regmap_write(wdt->regmap, wdt->offset + 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 | WDT_CTRL_ASSERT_SYS_RESET; + if (wdt->assert_wdt_timeout) + val |= WDT_CTRL_ASSERT_WDT_TIMEOUT; + if (nowayout) + val |= WDT_CTRL_LOCK; + + return regmap_update_bits(wdt->regmap, wdt->offset + 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 + 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 + 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 + 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 + 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 + 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; + + if (!pdev->dev.parent) + return -ENODEV; + + wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL); + if (!wdt) + return -ENOMEM; + + 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; + + if (device_property_read_bool(&pdev->dev, + "kontron,assert-wdt-timeout-pin")) + wdt->assert_wdt_timeout = true; + + /* 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 + WDT_TIMEOUT, + &val); + if (ret < 0) + return ret; + wdd->timeout = val; + } + + watchdog_stop_on_reboot(wdd); + ret = devm_watchdog_register_device(&pdev->dev, 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 const struct of_device_id sl28cpld_wdt_of_match[] = { + { .compatible = "kontron,sl28cpld-wdt" }, + {}, +}; +MODULE_DEVICE_TABLE(of, sl28cpld_wdt_of_match); + +static const struct platform_device_id sl28cpld_wdt_id_table[] = { + { "sl28cpld-wdt" }, + {}, +}; +MODULE_DEVICE_TABLE(platform, sl28cpld_wdt_id_table); + +static struct platform_driver sl28cpld_wdt_driver = { + .probe = sl28cpld_wdt_probe, + .id_table = sl28cpld_wdt_id_table, + .driver = { + .name = KBUILD_MODNAME, + .of_match_table = sl28cpld_wdt_of_match, + }, +}; +module_platform_driver(sl28cpld_wdt_driver); + +MODULE_DESCRIPTION("sl28cpld Watchdog Driver"); +MODULE_AUTHOR("Michael Walle "); +MODULE_LICENSE("GPL");