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[35.228.58.138]) by smtp.gmail.com with ESMTPSA id q20-20020a056512211400b0050bea32beeasm206734lfr.216.2024.01.17.02.24.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jan 2024 02:24:55 -0800 (PST) From: Lukasz Majczak To: Gwendal Grignou , Lee Jones , Benson Leung , Wim Van Sebroeck , Tzung-Bi Shih , Radoslaw Biernacki Cc: linux-kernel@vger.kernel.org, chrome-platform@lists.linux.dev, linux-watchdog@vger.kernel.org, Lukasz Majczak Subject: [PATCH] drivers: watchdog: Add ChromeOS EC watchdog Date: Wed, 17 Jan 2024 10:24:49 +0000 Message-ID: <20240117102450.4080839-1-lma@chromium.org> X-Mailer: git-send-email 2.43.0.381.gb435a96ce8-goog Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This adds EC-based watchdog support for ChromeOS based devices equipped with embedded controller (EC). Signed-off-by: Lukasz Majczak --- MAINTAINERS | 6 + drivers/mfd/cros_ec_dev.c | 9 + drivers/watchdog/Kconfig | 15 + drivers/watchdog/Makefile | 3 + drivers/watchdog/cros_ec_wdt.c | 303 ++++++++++++++++++ .../linux/platform_data/cros_ec_commands.h | 78 ++--- 6 files changed, 370 insertions(+), 44 deletions(-) create mode 100644 drivers/watchdog/cros_ec_wdt.c diff --git a/MAINTAINERS b/MAINTAINERS index 391bbb855cbe..55cd626a525f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4952,6 +4952,12 @@ R: Sami Kyöstilä S: Maintained F: drivers/platform/chrome/cros_hps_i2c.c +CHROMEOS EC WATCHDOG +M: Lukasz Majczak +L: chrome-platform@lists.linux.dev +S: Maintained +F: drivers/watchdog/cros_ec_wdt.c + CHRONTEL CH7322 CEC DRIVER M: Joe Tessler L: linux-media@vger.kernel.org diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c index 79d393b602bf..60fe831cf30a 100644 --- a/drivers/mfd/cros_ec_dev.c +++ b/drivers/mfd/cros_ec_dev.c @@ -91,6 +91,10 @@ static const struct mfd_cell cros_usbpd_notify_cells[] = { { .name = "cros-usbpd-notify", }, }; +static const struct mfd_cell cros_ec_wdt_cells[] = { + { .name = "cros-ec-wdt-drv", } +}; + static const struct cros_feature_to_cells cros_subdevices[] = { { .id = EC_FEATURE_CEC, @@ -107,6 +111,11 @@ static const struct cros_feature_to_cells cros_subdevices[] = { .mfd_cells = cros_usbpd_charger_cells, .num_cells = ARRAY_SIZE(cros_usbpd_charger_cells), }, + { + .id = EC_FEATURE_HANG_DETECT, + .mfd_cells = cros_ec_wdt_cells, + .num_cells = ARRAY_SIZE(cros_ec_wdt_cells), + }, }; static const struct mfd_cell cros_ec_platform_cells[] = { diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 7d22051b15a2..1da4be661be8 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -2251,4 +2251,19 @@ config KEEMBAY_WATCHDOG To compile this driver as a module, choose M here: the module will be called keembay_wdt. +# +# ChromeOS EC-based Watchdog +# + +config CROS_EC_WATCHDOG + tristate "ChromeOS EC-based watchdog driver" + select WATCHDOG_CORE + depends on CROS_EC + help + This is the watchdog driver for ChromeOS devices equipped with EC. + The EC watchdog - when enabled - expects to be kicked within a given + time (default set to 30 seconds) otherwise it will simple reboot + the AP. Priori to that it can also send an event (configurable timeout) + about upcoming reboot. + endif # WATCHDOG diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 7cbc34514ec1..8295c209ddb0 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -234,3 +234,6 @@ 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 + +# Cros EC watchdog +obj-$(CONFIG_CROS_EC_WATCHDOG) += cros_ec_wdt.o diff --git a/drivers/watchdog/cros_ec_wdt.c b/drivers/watchdog/cros_ec_wdt.c new file mode 100644 index 000000000000..b461c0613269 --- /dev/null +++ b/drivers/watchdog/cros_ec_wdt.c @@ -0,0 +1,303 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CROS_EC_WATCHDOG_DEFAULT_TIME 30 /* seconds */ + +#define DEV_NAME "cros-ec-wdt-dev" +#define DRV_NAME "cros-ec-wdt-drv" + +static int cros_ec_wdt_ping(struct watchdog_device *wdd); +static int cros_ec_wdt_start(struct watchdog_device *wdd); +static int cros_ec_wdt_stop(struct watchdog_device *wdd); +static int cros_ec_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t); + +struct cros_ec_wdt_data { + bool start_on_resume; + bool keepalive_on; + struct cros_ec_device *cros_ec; + struct watchdog_device *wdd; +}; +static struct cros_ec_wdt_data wd_data; + +static const struct watchdog_info cros_ec_wdt_ident = { + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, + .firmware_version = 0, + .identity = DRV_NAME, +}; + +static const struct watchdog_ops cros_ec_wdt_ops = { + .owner = THIS_MODULE, + .ping = cros_ec_wdt_ping, + .start = cros_ec_wdt_start, + .stop = cros_ec_wdt_stop, + .set_timeout = cros_ec_wdt_set_timeout, +}; + +static struct watchdog_device cros_ec_wdd = { + .info = &cros_ec_wdt_ident, + .ops = &cros_ec_wdt_ops, + .timeout = CROS_EC_WATCHDOG_DEFAULT_TIME, + .bootstatus = EC_HANG_DETECT_AP_BOOT_NORMAL +}; + +static int cros_ec_wdt_send_hang_detect(struct cros_ec_wdt_data *wd_data, + uint16_t command, + uint16_t reboot_timeout_sec, + uint32_t *status) +{ + int ret; + + struct { + struct cros_ec_command msg; + union { + struct ec_params_hang_detect req; + struct ec_response_hang_detect resp; + }; + } __packed buf = { + .msg = { + .version = 0, + .command = EC_CMD_HANG_DETECT, + .insize = (command == EC_HANG_DETECT_CMD_GET_STATUS) ? + sizeof(struct ec_response_hang_detect) : + 0, + .outsize = sizeof(struct ec_params_hang_detect), + }, + .req = { + .command = command, + .reboot_timeout_sec = reboot_timeout_sec, + } + }; + + ret = cros_ec_cmd_xfer_status(wd_data->cros_ec, &buf.msg); + if (ret < 0) { + dev_warn(wd_data->wdd->parent, + "cros_ec_cmd_xfer_status failed(%d) command (%04x) reboot_timeout_sec(%ds)", + ret, command, reboot_timeout_sec); + return ret; + } + + if (status && (command == EC_HANG_DETECT_CMD_GET_STATUS)) { + *status = buf.resp.status; + dev_info(wd_data->wdd->parent, "EC Watchdog boot status (%d)", + buf.resp.status); + } + + return 0; +} + +static int cros_ec_wdt_ping(struct watchdog_device *wdd) +{ + struct cros_ec_wdt_data *wd_data = watchdog_get_drvdata(wdd); + int ret; + + ret = cros_ec_wdt_send_hang_detect(wd_data, EC_HANG_DETECT_CMD_RELOAD, + 0, NULL); + if (ret < 0) + dev_err(wdd->parent, "%s failed (%d)", __func__, ret); + else + wd_data->keepalive_on = true; + + return ret; +} + +static int cros_ec_wdt_start(struct watchdog_device *wdd) +{ + struct cros_ec_wdt_data *wd_data = watchdog_get_drvdata(wdd); + int ret = 0; + + /* Prepare watchdog on EC side */ + ret = cros_ec_wdt_send_hang_detect(wd_data, + EC_HANG_DETECT_CMD_SET_TIMEOUT, + wdd->timeout, + NULL); + if (ret < 0) + dev_err(wdd->parent, "%s failed (%d)", __func__, ret); + + return ret; +} + +static int cros_ec_wdt_stop(struct watchdog_device *wdd) +{ + struct cros_ec_wdt_data *wd_data = watchdog_get_drvdata(wdd); + int ret = 0; + + if (wd_data->keepalive_on) { + wd_data->keepalive_on = false; + ret = cros_ec_wdt_send_hang_detect(wd_data, EC_HANG_DETECT_CMD_CANCEL, + 0, NULL); + if (ret < 0) + dev_err(wdd->parent, "%s failed (%d)", __func__, ret); + } + + return ret; +} + +static int cros_ec_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t) +{ + struct cros_ec_wdt_data *wd_data = watchdog_get_drvdata(wdd); + int ret; + + if (t < EC_HANG_DETECT_MIN_TIMEOUT) { + dev_err(wdd->parent, + "%s failed, requested timeout is lower than min(%d < %d)", + __func__, t, EC_HANG_DETECT_MIN_TIMEOUT); + return -EINVAL; + } + + ret = cros_ec_wdt_send_hang_detect(wd_data, + EC_HANG_DETECT_CMD_SET_TIMEOUT, + t, NULL); + if (ret < 0) + dev_err(wdd->parent, "%s failed (%d)", __func__, ret); + else + wdd->timeout = t; + + return ret; +} + +static int cros_ec_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + /* We need to get a reference to cros_ec_devices + * (provides communication layer) which is a parent of + * the cros-ec-dev (our parent) + */ + struct cros_ec_device *cros_ec = dev_get_drvdata(dev->parent->parent); + int ret = 0; + uint32_t bootstatus; + + if (!cros_ec) { + ret = -ENODEV; + dev_err_probe(dev, ret, "There is no coresponding EC device!"); + return ret; + } + + cros_ec_wdd.parent = &pdev->dev; + wd_data.cros_ec = cros_ec; + wd_data.wdd = &cros_ec_wdd; + wd_data.start_on_resume = false; + wd_data.keepalive_on = false; + wd_data.wdd->timeout = CROS_EC_WATCHDOG_DEFAULT_TIME; + + watchdog_stop_on_reboot(&cros_ec_wdd); + watchdog_stop_on_unregister(&cros_ec_wdd); + watchdog_set_drvdata(&cros_ec_wdd, &wd_data); + platform_set_drvdata(pdev, &wd_data); + + /* Get current AP boot status */ + ret = cros_ec_wdt_send_hang_detect(&wd_data, EC_HANG_DETECT_CMD_GET_STATUS, 0, + &bootstatus); + if (ret < 0) { + dev_err_probe(dev, ret, "Couldn't get AP boot status from EC"); + return ret; + } + + /* + * If bootstatus is not EC_HANG_DETECT_AP_BOOT_NORMAL + * it mens EC has rebooted the AP due to watchdog timeout. + * Lets translate it to watchdog core status code. + */ + if (bootstatus != EC_HANG_DETECT_AP_BOOT_NORMAL) + wd_data.wdd->bootstatus = WDIOF_CARDRESET; + + ret = watchdog_register_device(&cros_ec_wdd); + if (ret < 0) + dev_err_probe(dev, ret, "Couldn't get AP boot status from EC"); + + return ret; +} + +static int cros_ec_wdt_remove(struct platform_device *pdev) +{ + struct cros_ec_wdt_data *wd_data = platform_get_drvdata(pdev); + + watchdog_unregister_device(wd_data->wdd); + + return 0; +} + +static void cros_ec_wdt_shutdown(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_wdt_data *wd_data = platform_get_drvdata(pdev); + int ret; + + /* + * Clean only bootstatus flag. + * EC wdt is are already stopped by watchdog framework. + */ + ret = cros_ec_wdt_send_hang_detect(wd_data, + EC_HANG_DETECT_CMD_CLEAR_STATUS, 0, NULL); + if (ret < 0) + dev_err(dev, "%s failed (%d)", __func__, ret); + + watchdog_unregister_device(wd_data->wdd); +} + +static int __maybe_unused cros_ec_wdt_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct device *dev = &pdev->dev; + struct cros_ec_wdt_data *wd_data = platform_get_drvdata(pdev); + int ret; + + if (watchdog_active(wd_data->wdd)) { + ret = cros_ec_wdt_send_hang_detect(wd_data, + EC_HANG_DETECT_CMD_CANCEL, 0, NULL); + if (ret < 0) + dev_err(dev, "%s failed (%d)", __func__, ret); + wd_data->start_on_resume = true; + } + + return 0; +} + +static int __maybe_unused cros_ec_wdt_resume(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct cros_ec_wdt_data *wd_data = platform_get_drvdata(pdev); + int ret; + + /* start_on_resume is only set if watchdog was active + * when device was going to sleep + */ + if (wd_data->start_on_resume) { + /* On resume we just need to setup a EC watchdog the same way as + * in cros_ec_wdt_start(). When userspace resumes from suspend + * the watchdog app should just start petting the watchdog again. + */ + ret = cros_ec_wdt_start(wd_data->wdd); + if (ret < 0) + dev_err(dev, "%s failed (%d)", __func__, ret); + + wd_data->start_on_resume = false; + } + + return 0; +} + +static struct platform_driver cros_ec_wdt_driver = { + .probe = cros_ec_wdt_probe, + .remove = cros_ec_wdt_remove, + .shutdown = cros_ec_wdt_shutdown, + .suspend = pm_ptr(cros_ec_wdt_suspend), + .resume = pm_ptr(cros_ec_wdt_resume), + .driver = { + .name = DRV_NAME, + }, +}; + +module_platform_driver(cros_ec_wdt_driver); + +MODULE_ALIAS("platform:" DRV_NAME); +MODULE_DESCRIPTION("Cros EC Watchdog Device Driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h index 7dae17b62a4d..35a7a2d32819 100644 --- a/include/linux/platform_data/cros_ec_commands.h +++ b/include/linux/platform_data/cros_ec_commands.h @@ -3961,60 +3961,50 @@ struct ec_response_i2c_passthru { } __ec_align1; /*****************************************************************************/ -/* Power button hang detect */ - +/* AP hang detect */ #define EC_CMD_HANG_DETECT 0x009F -/* Reasons to start hang detection timer */ -/* Power button pressed */ -#define EC_HANG_START_ON_POWER_PRESS BIT(0) - -/* Lid closed */ -#define EC_HANG_START_ON_LID_CLOSE BIT(1) - - /* Lid opened */ -#define EC_HANG_START_ON_LID_OPEN BIT(2) - -/* Start of AP S3->S0 transition (booting or resuming from suspend) */ -#define EC_HANG_START_ON_RESUME BIT(3) - -/* Reasons to cancel hang detection */ +#define EC_HANG_DETECT_MIN_TIMEOUT 5 -/* Power button released */ -#define EC_HANG_STOP_ON_POWER_RELEASE BIT(8) +/* EC hang detect commands */ +enum ec_hang_detect_cmds { + /* Reload AP hang detect timer. */ + EC_HANG_DETECT_CMD_RELOAD = 0x0, -/* Any host command from AP received */ -#define EC_HANG_STOP_ON_HOST_COMMAND BIT(9) + /* Stop AP hang detect timer. */ + EC_HANG_DETECT_CMD_CANCEL = 0x1, -/* Stop on end of AP S0->S3 transition (suspending or shutting down) */ -#define EC_HANG_STOP_ON_SUSPEND BIT(10) + /* Configure watchdog with given reboot timeout and + * cancel currently running AP hand detect timer. + */ + EC_HANG_DETECT_CMD_SET_TIMEOUT = 0x2, -/* - * If this flag is set, all the other fields are ignored, and the hang detect - * timer is started. This provides the AP a way to start the hang timer - * without reconfiguring any of the other hang detect settings. Note that - * you must previously have configured the timeouts. - */ -#define EC_HANG_START_NOW BIT(30) + /* Get last hang status - whether the AP boot was clear or not */ + EC_HANG_DETECT_CMD_GET_STATUS = 0x3, -/* - * If this flag is set, all the other fields are ignored (including - * EC_HANG_START_NOW). This provides the AP a way to stop the hang timer - * without reconfiguring any of the other hang detect settings. - */ -#define EC_HANG_STOP_NOW BIT(31) + /* Clear last hang status. Called when AP is rebooting/shutting down + * gracefully. + */ + EC_HANG_DETECT_CMD_CLEAR_STATUS = 0x4 +}; struct ec_params_hang_detect { - /* Flags; see EC_HANG_* */ - uint32_t flags; - - /* Timeout in msec before generating host event, if enabled */ - uint16_t host_event_timeout_msec; - - /* Timeout in msec before generating warm reboot, if enabled */ - uint16_t warm_reboot_timeout_msec; -} __ec_align4; + uint16_t command; /* enum ec_hang_detect_cmds */ + /* Timeout in seconds before generating reboot */ + uint16_t reboot_timeout_sec; +} __ec_align2; +/* Status codes that describe whether AP has boot normally or the hang has been + * detected and EC has reset AP + */ +enum ec_hang_detect_status { + EC_HANG_DETECT_AP_BOOT_NORMAL = 0x0, + EC_HANG_DETECT_AP_BOOT_EC_WDT = 0x1, + EC_HANG_DETECT_AP_BOOT_COUNT, +}; +struct ec_response_hang_detect { + uint8_t status; /* enum ec_hang_detect_status */ +} __ec_align1; /*****************************************************************************/ /* Commands for battery charging */