From patchwork Tue Jan 12 11:31:59 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Yan X-Patchwork-Id: 8016461 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 0BC489F2F4 for ; Tue, 12 Jan 2016 11:34:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E12352038E for ; Tue, 12 Jan 2016 11:34:41 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BFB8D20120 for ; Tue, 12 Jan 2016 11:34:40 +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 1aIxC6-000644-65; Tue, 12 Jan 2016 11:32:58 +0000 Received: from regular1.263xmail.com ([211.150.99.133]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aIxBz-0005qU-32; Tue, 12 Jan 2016 11:32:55 +0000 Received: from andy.yan?rock-chips.com (unknown [192.168.167.233]) by regular1.263xmail.com (Postfix) with SMTP id 5D92585A1; Tue, 12 Jan 2016 19:32:23 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 Received: from mae.263xmail.com (unknown [115.29.238.69]) by smtp.263.net (Postfix) with ESMTP id 84C89408; Tue, 12 Jan 2016 19:32:24 +0800 (CST) Received: from yxj?rock-chips.com (localhost [127.0.0.1]) by mae.263xmail.com (Postfix) with SMTP id 2ED6A27EC02; Tue, 12 Jan 2016 19:32:24 +0800 (CST) X-MAE-MAIL_UID: 005694e44801bda2@maes@d4c4948a46d6e4c7 X-MAE-ID: 223.6.254.61 X-RL-SENDER: andy.yan@rock-chips.com X-LOGIN-NAME: andy.yan@rock-chips.com X-SENDER-IP: 121.15.173.1 X-SENDER: yxj@rock-chips.com From: Andy Yan To: heiko@sntech.de, arnd@arndb.de, john.stultz@linaro.org Subject: [PATCH v2 2/4] power: reset: add reboot mode driver Date: Tue, 12 Jan 2016 19:31:59 +0800 Message-Id: <1452598319-8324-1-git-send-email-andy.yan@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1452598029-8222-1-git-send-email-andy.yan@rock-chips.com> References: <1452598029-8222-1-git-send-email-andy.yan@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160112_033253_362134_6F1C949F X-CRM114-Status: GOOD ( 19.14 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, geert+renesas@glider.be, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, alexandre.belloni@free-electrons.com, lorenzo.pieralisi@arm.com, f.fainelli@gmail.com, linux@arm.linux.org.uk, dbaryshkov@gmail.com, cernekee@gmail.com, linux-rockchip@lists.infradead.org, linux@roeck-us.net, devicetree@vger.kernel.org, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, robh+dt@kernel.org, maxime.ripard@free-electrons.com, linux-arm-kernel@lists.infradead.org, moritz.fischer@ettus.com, linux-pm@vger.kernel.org, sre@kernel.org, galak@codeaurora.org, olof@lixom.net, Andy Yan , jun.nie@linaro.org, dwmw2@infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This driver parse the reboot commands like "reboot loader" and "reboot recovery" to get a boot mode described in the device tree , then call the write interfae to store the boot mode in some persistent storage like special register or ram, which can be read by the bootloader after system reboot, then the bootloader can take different action according to the mode stored. This is commonly used on Android based devices, which in order to reboot the device into fastboot or recovery mode. Signed-off-by: Andy Yan Reviewed-by: Matthias Brugger --- Changes in v2: - move to dir drivers/power/reset/ - make syscon-reboot-mode a generic driver Changes in v1: - fix the embarrassed compile warning - correct the maskrom magic number - check for the normal reboot drivers/power/reset/Kconfig | 16 +++++ drivers/power/reset/Makefile | 2 + drivers/power/reset/reboot-mode.c | 100 +++++++++++++++++++++++++++++++ drivers/power/reset/reboot-mode.h | 6 ++ drivers/power/reset/syscon-reboot-mode.c | 62 +++++++++++++++++++ 5 files changed, 186 insertions(+) create mode 100644 drivers/power/reset/reboot-mode.c create mode 100644 drivers/power/reset/reboot-mode.h create mode 100644 drivers/power/reset/syscon-reboot-mode.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 1131cf7..2e6d873 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -173,5 +173,21 @@ config POWER_RESET_ZX help Reboot support for ZTE SoCs. +config REBOOT_MODE + tristate + depends on OF + help + This driver will help to pass the system reboot mode + to bootloader + +config SYSCON_REBOOT_MODE + bool "Generic SYSCON regmap reboot mode driver" + select REBOOT_MODE + help + Say y here will enable reboot mode driver. This will + get reboot mode arguments and store it in SYSCON mapped + register, then the bootloader can read it to take different + action according to the mode. + endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 096fa67..a63865b 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -20,3 +20,5 @@ obj-$(CONFIG_POWER_RESET_SYSCON) += syscon-reboot.o obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o +obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o +obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c new file mode 100644 index 0000000..92b7b4d --- /dev/null +++ b/drivers/power/reset/reboot-mode.c @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd + * + * 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 +#include "reboot-mode.h" + +struct mode_info { + const char *mode; + int magic; + struct list_head list; +}; + +struct reboot_mode_driver { + struct list_head head; + int (*write)(int magic); + struct notifier_block reboot_notifier; +}; + +static int get_reboot_mode_magic(struct reboot_mode_driver *reboot, + const char *cmd) +{ + const char *normal = "normal"; + int magic = 0; + struct mode_info *info; + + if (!cmd) + cmd = normal; + + list_for_each_entry(info, &reboot->head, list) { + if (!strcmp(info->mode, cmd)) { + magic = info->magic; + break; + } + } + + return magic; +} + +static int reboot_mode_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct reboot_mode_driver *reboot; + int magic; + + reboot = container_of(this, struct reboot_mode_driver, reboot_notifier); + magic = get_reboot_mode_magic(reboot, cmd); + if (magic) + reboot->write(magic); + + return NOTIFY_DONE; +} + +int reboot_mode_register(struct device *dev, int (*write)(int)) +{ + struct reboot_mode_driver *reboot; + struct mode_info *info; + struct device_node *child; + int ret; + + reboot = devm_kzalloc(dev, sizeof(*reboot), GFP_KERNEL); + if (!reboot) + return -ENOMEM; + + reboot->write = write; + INIT_LIST_HEAD(&reboot->head); + for_each_child_of_node(dev->of_node, child) { + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + info->mode = of_get_property(child, "linux,mode", NULL); + if (of_property_read_u32(child, "loader,magic", &info->magic)) { + dev_err(dev, "reboot mode %s without magic number\n", + info->mode); + devm_kfree(dev, info); + continue; + } + list_add_tail(&info->list, &reboot->head); + } + reboot->reboot_notifier.notifier_call = reboot_mode_notify; + ret = register_reboot_notifier(&reboot->reboot_notifier); + if (ret) + dev_err(dev, "can't register reboot notifier\n"); + + return ret; +} +EXPORT_SYMBOL_GPL(reboot_mode_register); + +MODULE_AUTHOR("Andy Yan +#include +#include +#include +#include +#include +#include +#include +#include +#include "reboot-mode.h" + +static struct regmap *map; +static u32 offset; + +static int syscon_reboot_mode_write(int magic) +{ + regmap_write(map, offset, magic); + + return 0; +} + +static int syscon_reboot_mode_probe(struct platform_device *pdev) +{ + int ret; + + map = syscon_node_to_regmap(pdev->dev.parent->of_node); + if (IS_ERR(map)) + return PTR_ERR(map); + if (of_property_read_u32(pdev->dev.of_node, "offset", &offset)) + return -EINVAL; + ret = reboot_mode_register(&pdev->dev, syscon_reboot_mode_write); + if (ret) + dev_err(&pdev->dev, "can't register reboot mode\n"); + + return ret; +} + +static const struct of_device_id syscon_reboot_mode_of_match[] = { + { .compatible = "syscon-reboot-mode" }, + {} +}; + +static struct platform_driver syscon_reboot_mode_driver = { + .probe = syscon_reboot_mode_probe, + .driver = { + .name = "syscon-reboot-mode", + .of_match_table = syscon_reboot_mode_of_match, + }, +}; +module_platform_driver(syscon_reboot_mode_driver); + +MODULE_AUTHOR("Andy Yan