From patchwork Fri Jan 18 11:40:13 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Baltieri X-Patchwork-Id: 14112 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 0A80D23F02 for ; Fri, 18 Jan 2013 11:41:29 +0000 (UTC) Received: from mail-vc0-f174.google.com (mail-vc0-f174.google.com [209.85.220.174]) by fiordland.canonical.com (Postfix) with ESMTP id A44EEA181AC for ; Fri, 18 Jan 2013 11:41:28 +0000 (UTC) Received: by mail-vc0-f174.google.com with SMTP id n11so1592378vch.33 for ; Fri, 18 Jan 2013 03:41:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:x-forwarded-to:x-forwarded-for:delivered-to:x-received :received-spf:x-received:from:to:cc:subject:date:message-id:x-mailer :in-reply-to:references:x-gm-message-state; bh=QzsCdFZrND0k40YhHuJMiD0Cg7Vm3GLxiprK07OLgn8=; b=dQq3kNctb/z8tSAKeajezGKDKqzWDANFAXVi97CR7SUZEZW6LflpkIhi8nBfBau1h/ RPGOIGdRlCB36nbCtfLvzCMtpj2omOZ4wEJodp2OVLqLKjA0IF2138m2pdCFOroMMaDx bnyBxFTKBOlZlAwzDgKBtqGcx+f3UTZA+RW+Vb8hHlC737Qvg3uRkljtW3RDP1r4hvrX qaTVu/L+VG2Nvixnyy2UtdQvtSZviZCfzeEg8ZWzDjdEQmVseLLEXwifXXJEb4W8N6lz wJS/j7OcQQOdR3dhPfog9bGUX3Dj3Mko4QmfUO9FAkOKoKGEd887Pt2CMBIDRDNBWP5S Ln2g== X-Received: by 10.52.97.7 with SMTP id dw7mr8095688vdb.38.1358509288170; Fri, 18 Jan 2013 03:41:28 -0800 (PST) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.58.145.101 with SMTP id st5csp79381veb; Fri, 18 Jan 2013 03:41:27 -0800 (PST) X-Received: by 10.180.107.130 with SMTP id hc2mr3118828wib.12.1358509286222; Fri, 18 Jan 2013 03:41:26 -0800 (PST) Received: from mail-ee0-f44.google.com (mail-ee0-f44.google.com [74.125.83.44]) by mx.google.com with ESMTPS id x3si7987662eep.204.2013.01.18.03.41.25 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 18 Jan 2013 03:41:26 -0800 (PST) Received-SPF: neutral (google.com: 74.125.83.44 is neither permitted nor denied by best guess record for domain of fabio.baltieri@linaro.org) client-ip=74.125.83.44; Authentication-Results: mx.google.com; spf=neutral (google.com: 74.125.83.44 is neither permitted nor denied by best guess record for domain of fabio.baltieri@linaro.org) smtp.mail=fabio.baltieri@linaro.org Received: by mail-ee0-f44.google.com with SMTP id l10so1685466eei.17 for ; Fri, 18 Jan 2013 03:41:25 -0800 (PST) X-Received: by 10.14.221.9 with SMTP id q9mr25583645eep.3.1358509285674; Fri, 18 Jan 2013 03:41:25 -0800 (PST) Received: from localhost ([2a01:2029:1:1653:8e70:5aff:feac:ad8]) by mx.google.com with ESMTPS id q44sm6962715eep.5.2013.01.18.03.41.19 (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Fri, 18 Jan 2013 03:41:24 -0800 (PST) From: Fabio Baltieri To: linux-watchdog@vger.kernel.org, Samuel Ortiz , Wim Van Sebroeck Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Linus Walleij , Lee Jones , Srinidhi Kasagar , Fabio Baltieri Subject: [PATCH 3/4] watchdog: add support for ux500_wdt watchdog Date: Fri, 18 Jan 2013 12:40:13 +0100 Message-Id: <1358509214-22407-4-git-send-email-fabio.baltieri@linaro.org> X-Mailer: git-send-email 1.7.12.1 In-Reply-To: <1358509214-22407-1-git-send-email-fabio.baltieri@linaro.org> References: <1358509214-22407-1-git-send-email-fabio.baltieri@linaro.org> X-Gm-Message-State: ALoCoQmyumCu7btl6gXdslSE+h3obqEWJwcGcWGnu6j1+VOBhMA2hHtcUig6wKXkcqz0cIwLgiNe This patch adds support for the ux500_wdt watchdog that is found in ST-Ericsson Ux500 platform. The driver is based on PRCMU APIs. Acked-by: Lee Jones Signed-off-by: Fabio Baltieri --- drivers/watchdog/Kconfig | 12 +++ drivers/watchdog/Makefile | 1 + drivers/watchdog/ux500_wdt.c | 171 ++++++++++++++++++++++++++++++++ include/linux/platform_data/ux500_wdt.h | 19 ++++ 4 files changed, 203 insertions(+) create mode 100644 drivers/watchdog/ux500_wdt.c create mode 100644 include/linux/platform_data/ux500_wdt.h diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 7f809fd..26e1fdb 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -364,6 +364,18 @@ config IMX2_WDT To compile this driver as a module, choose M here: the module will be called imx2_wdt. +config UX500_WATCHDOG + tristate "ST-Ericsson Ux500 watchdog" + depends on MFD_DB8500_PRCMU + select WATCHDOG_CORE + default y + help + Say Y here to include Watchdog timer support for the watchdog + existing in the prcmu of ST-Ericsson Ux500 series platforms. + + To compile this driver as a module, choose M here: the + module will be called ux500_wdt. + # AVR32 Architecture config AT32AP700X_WDT diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index 97bbdb3a..bec86ee 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -52,6 +52,7 @@ obj-$(CONFIG_STMP3XXX_WATCHDOG) += stmp3xxx_wdt.o obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o +obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o # AVR32 Architecture obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o diff --git a/drivers/watchdog/ux500_wdt.c b/drivers/watchdog/ux500_wdt.c new file mode 100644 index 0000000..dd608db --- /dev/null +++ b/drivers/watchdog/ux500_wdt.c @@ -0,0 +1,171 @@ +/* + * Copyright (C) ST-Ericsson SA 2011-2013 + * + * License Terms: GNU General Public License v2 + * + * Author: Mathieu Poirier for ST-Ericsson + * Author: Jonas Aaberg for ST-Ericsson + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define WATCHDOG_TIMEOUT 600 /* 10 minutes */ + +#define WATCHDOG_MIN 0 +#define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */ +#define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */ + +static int timeout = WATCHDOG_TIMEOUT; +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, + "Watchdog timeout in seconds. default=" + __MODULE_STRING(WATCHDOG_TIMEOUT) "."); + +static int nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, int, 0); +MODULE_PARM_DESC(nowayout, + "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +static int ux500_wdt_start(struct watchdog_device *wdd) +{ + return prcmu_enable_a9wdog(PRCMU_WDOG_ALL); +} + +static int ux500_wdt_stop(struct watchdog_device *wdd) +{ + return prcmu_disable_a9wdog(PRCMU_WDOG_ALL); +} + +static int ux500_wdt_keepalive(struct watchdog_device *wdd) +{ + return prcmu_kick_a9wdog(PRCMU_WDOG_ALL); +} + +static int ux500_wdt_set_timeout(struct watchdog_device *wdd, + unsigned int timeout) +{ + ux500_wdt_stop(wdd); + prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); + ux500_wdt_start(wdd); + + return 0; +} + +static const struct watchdog_info ux500_wdt_info = { + .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, + .identity = "Ux500 WDT", + .firmware_version = 1, +}; + +static const struct watchdog_ops ux500_wdt_ops = { + .owner = THIS_MODULE, + .start = ux500_wdt_start, + .stop = ux500_wdt_stop, + .ping = ux500_wdt_keepalive, + .set_timeout = ux500_wdt_set_timeout, +}; + +static struct watchdog_device ux500_wdt = { + .info = &ux500_wdt_info, + .ops = &ux500_wdt_ops, + .min_timeout = WATCHDOG_MIN, + .max_timeout = WATCHDOG_MAX32, +}; + +static int ux500_wdt_probe(struct platform_device *pdev) +{ + int ret; + struct ux500_wdt_data *pdata = pdev->dev.platform_data; + + if (pdata) { + if (pdata->timeout > 0) + timeout = pdata->timeout; + if (pdata->has_28_bits_resolution) + ux500_wdt.max_timeout = WATCHDOG_MAX28; + } + + watchdog_set_nowayout(&ux500_wdt, nowayout); + + /* disable auto off on sleep */ + prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); + + /* set HW initial value */ + prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); + + ret = watchdog_register_device(&ux500_wdt); + if (ret) + return ret; + + dev_info(&pdev->dev, "initialized\n"); + + return 0; +} + +static int ux500_wdt_remove(struct platform_device *dev) +{ + watchdog_unregister_device(&ux500_wdt); + + return 0; +} + +#ifdef CONFIG_PM +static int ux500_wdt_suspend(struct platform_device *pdev, + pm_message_t state) +{ + if (watchdog_active(&ux500_wdt)) { + ux500_wdt_stop(&ux500_wdt); + prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true); + + prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); + ux500_wdt_start(&ux500_wdt); + } + return 0; +} + +static int ux500_wdt_resume(struct platform_device *pdev) +{ + if (watchdog_active(&ux500_wdt)) { + ux500_wdt_stop(&ux500_wdt); + prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false); + + prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000); + ux500_wdt_start(&ux500_wdt); + } + return 0; +} +#else +#define ux500_wdt_suspend NULL +#define ux500_wdt_resume NULL +#endif + +static struct platform_driver ux500_wdt_driver = { + .probe = ux500_wdt_probe, + .remove = ux500_wdt_remove, + .suspend = ux500_wdt_suspend, + .resume = ux500_wdt_resume, + .driver = { + .owner = THIS_MODULE, + .name = "ux500_wdt", + }, +}; + +module_platform_driver(ux500_wdt_driver); + +MODULE_AUTHOR("Jonas Aaberg "); +MODULE_DESCRIPTION("Ux500 Watchdog Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); +MODULE_ALIAS("platform:ux500_wdt"); diff --git a/include/linux/platform_data/ux500_wdt.h b/include/linux/platform_data/ux500_wdt.h new file mode 100644 index 0000000..aa2dfe7 --- /dev/null +++ b/include/linux/platform_data/ux500_wdt.h @@ -0,0 +1,19 @@ +/* + * Copyright (C) ST Ericsson SA 2011 + * + * License Terms: GNU General Public License v2 + * + * STE Ux500 Watchdog platform data + */ +#ifndef __UX500_WDT_H +#define __UX500_WDT_H + +/** + * struct ux500_wdt_data + */ +struct ux500_wdt_data { + int timeout; + bool has_28_bits_resolution; +}; + +#endif /* __UX500_WDT_H */