Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932826AbaGQMc7 (ORCPT ); Thu, 17 Jul 2014 08:32:59 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.139]:11227 "EHLO mail1.bemta5.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756598AbaGQMc4 (ORCPT ); Thu, 17 Jul 2014 08:32:56 -0400 X-Greylist: delayed 413 seconds by postgrey-1.27 at vger.kernel.org; Thu, 17 Jul 2014 08:32:55 EDT X-Env-Sender: Andreas.Werner@men.de X-Msg-Ref: server-12.tower-180.messagelabs.com!1405599981!34589525!1 X-Originating-IP: [80.255.6.145] X-StarScan-Received: X-StarScan-Version: 6.11.3; banners=-,-,- X-VirusChecked: Checked X-PGP-Universal: processed; by keys.men.de on Thu, 17 Jul 2014 14:26:22 +0200 Date: Thu, 17 Jul 2014 15:18:31 +0200 From: Andreas Werner To: CC: , , , , , , Subject: [PATCH v3 2/3] drivers/watchdog/menf21bmc_wdt: introduce MEN 14F021P00 BMC Watchdog driver Message-ID: <5cfec77647c86edae480ce7654af472106162ff2.1405602280.git.andreas.werner@men.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) X-Originating-IP: [192.1.1.171] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Added driver to support the 14F021P00 BMC Watchdog. The BMC is a Board Management Controller including watchdog functionality. This driver use the I2C interface to the BMC using the menf21bmc MFD Core driver. Signed-off-by: Andreas Werner --- drivers/watchdog/Kconfig | 7 ++ drivers/watchdog/Makefile | 1 + drivers/watchdog/menf21bmc_wdt.c | 206 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 214 insertions(+) create mode 100644 drivers/watchdog/menf21bmc_wdt.c diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 76dd541..f96431d 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -95,6 +95,13 @@ config GPIO_WATCHDOG If you say yes here you get support for watchdog device controlled through GPIO-line. +config MENF21BMC_WATCHDOG + tristate "MEN 14F021P00 BMC Watchdog" + depends on MFD_MENF21BMC + select WATCHDOG_CORE + help + Say Y here to include support for the MEN 14F021P00 BMC Watchdog. + config WM831X_WATCHDOG tristate "WM831x watchdog" depends on MFD_WM831X diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 468c320..de17014 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -178,3 +178,4 @@ obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o +obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o diff --git a/drivers/watchdog/menf21bmc_wdt.c b/drivers/watchdog/menf21bmc_wdt.c new file mode 100644 index 0000000..b46ee92 --- /dev/null +++ b/drivers/watchdog/menf21bmc_wdt.c @@ -0,0 +1,206 @@ +/* + * MEN 14F021P00 Board Management Controller (BMC) Watchdog Driver. + * + * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH + * Author: Andreas Werner + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include +#include +#include +#include +#include +#include + +#define DEVNAME "menf21bmc_wdt" + +#define BMC_CMD_WD_ON 0x11 +#define BMC_CMD_WD_OFF 0x12 +#define BMC_CMD_WD_TRIG 0x13 +#define BMC_CMD_WD_TIME 0x14 +#define BMC_CMD_WD_STATE 0x17 +#define BMC_WD_OFF_VAL 0x69 +#define BMC_CMD_RST_RSN 0x92 + +#define BMC_WD_TIMEOUT_MIN 1 /* in sec */ +#define BMC_WD_TIMEOUT_MAX 6553 /* in sec */ + +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 menf21bmc_wdt { + struct watchdog_device wdt; + struct i2c_client *i2c_client; +}; + +static int menf21bmc_wdt_set_bootstatus(struct menf21bmc_wdt *data) +{ + int rst_rsn; + + rst_rsn = i2c_smbus_read_byte_data(data->i2c_client, BMC_CMD_RST_RSN); + if (rst_rsn < 0) + return rst_rsn; + + if (rst_rsn == 0x02) + data->wdt.bootstatus |= WDIOF_CARDRESET; + else if (rst_rsn == 0x05) + data->wdt.bootstatus |= WDIOF_EXTERN1; + else if (rst_rsn == 0x06) + data->wdt.bootstatus |= WDIOF_EXTERN2; + else if (rst_rsn == 0x0A) + data->wdt.bootstatus |= WDIOF_POWERUNDER; + + return 0; +} + +static int menf21bmc_wdt_start(struct watchdog_device *wdt) +{ + struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); + + return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_ON); +} + +static int menf21bmc_wdt_stop(struct watchdog_device *wdt) +{ + struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); + + return i2c_smbus_write_byte_data(drv_data->i2c_client, + BMC_CMD_WD_OFF, BMC_WD_OFF_VAL); +} + +static int +menf21bmc_wdt_settimeout(struct watchdog_device *wdt, unsigned int timeout) +{ + int ret; + struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); + + /* + * BMC Watchdog does have a resolution of 100ms. + * Watchdog API defines the timeout in seconds, so we have to + * multiply the value. + */ + ret = i2c_smbus_write_word_data(drv_data->i2c_client, + BMC_CMD_WD_TIME, timeout * 10); + if (ret < 0) + return ret; + + wdt->timeout = timeout; + + return 0; +} + +static int menf21bmc_wdt_ping(struct watchdog_device *wdt) +{ + struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); + + return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_TRIG); +} + +static const struct watchdog_info menf21bmc_wdt_info = { + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .identity = DEVNAME, +}; + +static const struct watchdog_ops menf21bmc_wdt_ops = { + .owner = THIS_MODULE, + .start = menf21bmc_wdt_start, + .stop = menf21bmc_wdt_stop, + .ping = menf21bmc_wdt_ping, + .set_timeout = menf21bmc_wdt_settimeout, +}; + +static int menf21bmc_wdt_probe(struct platform_device *pdev) +{ + int ret, bmc_timeout; + struct menf21bmc_wdt *drv_data; + struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent); + + drv_data = devm_kzalloc(&pdev->dev, + sizeof(struct menf21bmc_wdt), GFP_KERNEL); + if (!drv_data) + return -ENOMEM; + + drv_data->wdt.ops = &menf21bmc_wdt_ops; + drv_data->wdt.info = &menf21bmc_wdt_info; + drv_data->wdt.min_timeout = BMC_WD_TIMEOUT_MIN; + drv_data->wdt.max_timeout = BMC_WD_TIMEOUT_MAX; + drv_data->i2c_client = i2c_client; + + /* + * Get the current wdt timeout value from the BMC because + * the BMC will save the value set before if the system restarts. + */ + bmc_timeout = i2c_smbus_read_word_data(drv_data->i2c_client, + BMC_CMD_WD_TIME); + if (bmc_timeout < 0) { + dev_err(&pdev->dev, "failed to get current WDT timeout\n"); + return bmc_timeout; + } + + watchdog_init_timeout(&drv_data->wdt, bmc_timeout / 10, &pdev->dev); + watchdog_set_nowayout(&drv_data->wdt, nowayout); + watchdog_set_drvdata(&drv_data->wdt, drv_data); + platform_set_drvdata(pdev, drv_data); + + ret = menf21bmc_wdt_set_bootstatus(drv_data); + if (ret < 0) { + dev_err(&pdev->dev, "failed to set Watchdog bootstatus\n"); + return ret; + } + + ret = watchdog_register_device(&drv_data->wdt); + if (ret) { + dev_err(&pdev->dev, "failed to register Watchdog device\n"); + return ret; + } + + dev_info(&pdev->dev, "MEN 14F021P00 BMC Watchdog device enabled\n"); + + return 0; +} + +static int menf21bmc_wdt_remove(struct platform_device *pdev) +{ + struct menf21bmc_wdt *drv_data = platform_get_drvdata(pdev); + + dev_warn(&pdev->dev, + "Unregister MEN 14F021P00 BMC Watchdog device, board may reset\n"); + + watchdog_unregister_device(&drv_data->wdt); + + return 0; +} + +static void menf21bmc_wdt_shutdown(struct platform_device *pdev) +{ + struct menf21bmc_wdt *drv_data = platform_get_drvdata(pdev); + + i2c_smbus_write_word_data(drv_data->i2c_client, + BMC_CMD_WD_OFF, BMC_WD_OFF_VAL); +} + +static struct platform_driver menf21bmc_wdt = { + .driver = { + .owner = THIS_MODULE, + .name = DEVNAME, + }, + .probe = menf21bmc_wdt_probe, + .remove = menf21bmc_wdt_remove, + .shutdown = menf21bmc_wdt_shutdown, +}; + +module_platform_driver(menf21bmc_wdt); + +MODULE_DESCRIPTION("MEN 14F021P00 BMC Watchdog driver"); +MODULE_AUTHOR("Andreas Werner "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:menf21bmc_wdt"); -- 2.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/