From patchwork Thu Mar 5 15:49:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Belloni X-Patchwork-Id: 5947141 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 0FABE9F318 for ; Thu, 5 Mar 2015 15:55:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 103942038C for ; Thu, 5 Mar 2015 15:55:23 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 213BF2038A for ; Thu, 5 Mar 2015 15:55:21 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YTY4z-0001W7-Bh; Thu, 05 Mar 2015 15:52:53 +0000 Received: from down.free-electrons.com ([37.187.137.238] helo=mail.free-electrons.com) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YTY32-00005V-7q for linux-arm-kernel@lists.infradead.org; Thu, 05 Mar 2015 15:50:54 +0000 Received: by mail.free-electrons.com (Postfix, from userid 106) id 401353BE; Thu, 5 Mar 2015 16:50:35 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from localhost (128-79-216-6.hfc.dyn.abo.bbox.fr [128.79.216.6]) by mail.free-electrons.com (Postfix) with ESMTPSA id DF4DF3B3; Thu, 5 Mar 2015 16:50:04 +0100 (CET) From: Alexandre Belloni To: Nicolas Ferre , Daniel Lezcano Subject: [PATCH v4 4/9] power: reset: Add AT91RM9200 reset driver Date: Thu, 5 Mar 2015 16:49:49 +0100 Message-Id: <1425570594-13124-5-git-send-email-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1425570594-13124-1-git-send-email-alexandre.belloni@free-electrons.com> References: <1425570594-13124-1-git-send-email-alexandre.belloni@free-electrons.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150305_075052_644605_A9B4AFEE X-CRM114-Status: GOOD ( 15.36 ) X-Spam-Score: 1.0 (+) Cc: Boris Brezillon , linux-watchdog@vger.kernel.org, linux-pm@vger.kernel.org, Dmitry Eremin-Solenikov , Jean-Christophe Plagniol-Villard , Sebastian Reichel , linux-kernel@vger.kernel.org, Wim Van Sebroeck , Alexandre Belloni , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Lee Jones , Guenter Roeck X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP AT91RM9200 uses the watchdog from the system timer to reset. Signed-off-by: Alexandre Belloni --- drivers/power/reset/Kconfig | 7 ++++ drivers/power/reset/Makefile | 1 + drivers/power/reset/at91rm9200-reset.c | 72 ++++++++++++++++++++++++++++++++++ 3 files changed, 80 insertions(+) create mode 100644 drivers/power/reset/at91rm9200-reset.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 27f6646731b0..8d79e45ae754 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -30,6 +30,13 @@ config POWER_RESET_AT91_RESET This driver supports restart for Atmel AT91SAM9 and SAMA5 SoCs +config POWER_RESET_AT91RM9200_RESET + bool "Atmel AT91RM9200 reset driver" + depends on ARCH_AT91 && MFD_SYSCON + default SOC_AT91RM9200 + help + This driver supports restart for Atmel AT91RM9200. + config POWER_RESET_AXXIA bool "LSI Axxia reset driver" depends on ARCH_AXXIA diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 11de15bae52e..96e972bbb922 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -1,6 +1,7 @@ obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o +obj-$(CONFIG_POWER_RESET_AT91RM9200_RESET) += at91rm9200-reset.o obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o diff --git a/drivers/power/reset/at91rm9200-reset.c b/drivers/power/reset/at91rm9200-reset.c new file mode 100644 index 000000000000..b739ac82b9c9 --- /dev/null +++ b/drivers/power/reset/at91rm9200-reset.c @@ -0,0 +1,72 @@ +/* + * Atmel AT91 RM9200 SoCs reset code + * + * Copyright (C) 2015 Atmel Corporation. + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static struct regmap *regmap_st; + +static int at91rm9200_restart(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + /* + * Perform a hardware reset with the use of the Watchdog timer. + */ + regmap_write(regmap_st, AT91_ST_WDMR, + AT91_ST_RSTEN | AT91_ST_EXTEN | 1); + regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST); + + mdelay(2000); + + pr_emerg("Unable to restart system\n"); + return NOTIFY_DONE; +} + +static struct notifier_block at91rm9200_restart_nb = { + .notifier_call = at91rm9200_restart, + .priority = 192, +}; + +static int at91rm9200_reset_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + + regmap_st = syscon_node_to_regmap(np); + if (!regmap_st) + return -ENODEV; + + return register_restart_handler(&at91rm9200_restart_nb); +} + +static const struct of_device_id at91rm9200_reset_of_match[] = { + { .compatible = "atmel,at91rm9200-st" }, + { /* sentinel */ } +}; + +static struct platform_driver at91rm9200_reset_driver = { + .probe = at91rm9200_reset_probe, + .driver = { + .name = "at91rm9200-reset", + .of_match_table = at91rm9200_reset_of_match, + }, +}; +module_platform_driver(at91rm9200_reset_driver); + +MODULE_ALIAS("platform:at91rm9200-reset"); +MODULE_AUTHOR("Alexandre Belloni "); +MODULE_DESCRIPTION("Atmel at91rm9200 System Timer Reset driver"); +MODULE_LICENSE("GPL v2");