From patchwork Wed Mar 30 02:20:43 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Yan X-Patchwork-Id: 8692541 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 3C158C0553 for ; Wed, 30 Mar 2016 02:21:34 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0C4E820357 for ; Wed, 30 Mar 2016 02:21:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A4C39201ED for ; Wed, 30 Mar 2016 02:21:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754152AbcC3CVa (ORCPT ); Tue, 29 Mar 2016 22:21:30 -0400 Received: from regular1.263xmail.com ([211.150.99.138]:44286 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753697AbcC3CV3 (ORCPT ); Tue, 29 Mar 2016 22:21:29 -0400 Received: from andy.yan?rock-chips.com (unknown [192.168.167.12]) by regular1.263xmail.com (Postfix) with SMTP id 9F00779D8; Wed, 30 Mar 2016 10:21:22 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 X-KSVirus-check: 0 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id B3AD5432; Wed, 30 Mar 2016 10:21:18 +0800 (CST) X-RL-SENDER: andy.yan@rock-chips.com X-FST-TO: robh+dt@kernel.org X-SENDER-IP: 121.15.173.1 X-LOGIN-NAME: andy.yan@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-SENDER: yxj@rock-chips.com X-DNS-TYPE: 0 Received: from localhost.localdomain (unknown [121.15.173.1]) by smtp.263.net (Postfix) whith ESMTP id 2122E3BXS9; Wed, 30 Mar 2016 10:21:21 +0800 (CST) From: Andy Yan To: robh+dt@kernel.org, sre@kernel.org, heiko@sntech.de, john.stultz@linaro.org, arnd@arndb.de Cc: galak@codeaurora.org, ijc+devicetree@hellion.org.uk, catalin.marinas@arm.com, olof@lixom.net, alexandre.belloni@free-electrons.com, dbaryshkov@gmail.com, jun.nie@linaro.org, pawel.moll@arm.com, will.deacon@arm.com, linux-rockchip@lists.infradead.org, matthias.bgg@gmail.com, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, f.fainelli@gmail.com, linux@arm.linux.org.uk, mbrugger@suse.com, linux-arm-kernel@lists.infradead.org, lorenzo.pieralisi@arm.com, moritz.fischer@ettus.com, linux-kernel@vger.kernel.org, wxt@rock-chips.com, dwmw2@infradead.org, mark.rutland@arm.com, k.kozlowski@samsung.com, Andy Yan Subject: [PATCH v7 2/4] power: reset: add reboot mode driver Date: Wed, 30 Mar 2016 10:20:43 +0800 Message-Id: <1459304443-9811-1-git-send-email-andy.yan@rock-chips.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1459304304-9713-1-git-send-email-andy.yan@rock-chips.com> References: <1459304304-9713-1-git-send-email-andy.yan@rock-chips.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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 parses the reboot commands like "reboot bootloader" 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 place like special register or sram, 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, in order to reboot the device into fastboot or recovery mode. Reviewed-by: Matthias Brugger Reviewed-by: Moritz Fischer Tested-by: John Stultz Acked-by: John Stultz Signed-off-by: Andy Yan --- Changes in v7: - address some suggestions from Krzysztof, make syscon-reboot-mode driver data self-contained. Changes in v6: None Changes in v5: - use two blank space under help in Kconfig - use unsigned int instead of int for member magic in struct mode_info Changes in v4: - make this driver depends on OF to avoid kbuild test error Changes in v3: - scan multi properities - add mask value for some platform which only use some bits of the register to store boot mode magic value 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 | 13 ++++ drivers/power/reset/Makefile | 2 + drivers/power/reset/reboot-mode.c | 115 +++++++++++++++++++++++++++++++ drivers/power/reset/reboot-mode.h | 6 ++ drivers/power/reset/syscon-reboot-mode.c | 86 +++++++++++++++++++++++ 5 files changed, 222 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..cf50630 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -173,5 +173,18 @@ config POWER_RESET_ZX help Reboot support for ZTE SoCs. +config REBOOT_MODE + tristate + +config SYSCON_REBOOT_MODE + bool "Generic SYSCON regmap reboot mode driver" + depends on OF + 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..ae6f931 --- /dev/null +++ b/drivers/power/reset/reboot-mode.c @@ -0,0 +1,115 @@ +/* + * 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" + +#define PREFIX "mode-" + +struct mode_info { + const char *mode; + unsigned int magic; + struct list_head list; +}; + +struct reboot_mode_driver { + struct device *dev; + struct list_head head; + int (*write)(struct device *dev, 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(reboot->dev, magic); + + return NOTIFY_DONE; +} + +int reboot_mode_register(struct device *dev, int (*write)(struct device *, int)) +{ + struct reboot_mode_driver *reboot; + struct mode_info *info; + struct property *prop; + struct device_node *np; + size_t len = strlen(PREFIX); + int ret; + + reboot = devm_kzalloc(dev, sizeof(*reboot), GFP_KERNEL); + if (!reboot) + return -ENOMEM; + + reboot->dev = dev; + reboot->write = write; + INIT_LIST_HEAD(&reboot->head); + + np = of_node_get(dev->of_node); + for_each_property_of_node(np, prop) { + if (len > strlen(prop->name) || strncmp(prop->name, PREFIX, len)) + continue; + + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->mode = kstrdup_const(prop->name + len, GFP_KERNEL); + if (of_property_read_u32(np, prop->name, &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); + } + of_node_put(np); + + 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 "reboot-mode.h" + +struct syscon_reboot_mode { + struct device *dev; + struct regmap *map; + u32 offset; + u32 mask; +}; + +static int syscon_reboot_mode_write(struct device *dev, int magic) +{ + struct syscon_reboot_mode *syscon_rbm = dev_get_drvdata(dev); + int ret; + + ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, + syscon_rbm->mask, magic); + if (ret < 0) + dev_err(dev, "update reboot mode bits failed\n"); + + return ret; +} + +static int syscon_reboot_mode_probe(struct platform_device *pdev) +{ + int ret; + struct syscon_reboot_mode *syscon_rbm; + + syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); + if (!syscon_rbm) + return -ENOMEM; + + syscon_rbm->dev = &pdev->dev; + syscon_rbm->mask = 0xffffffff; + + syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); + if (IS_ERR(syscon_rbm->map)) + return PTR_ERR(syscon_rbm->map); + + if (of_property_read_u32(pdev->dev.of_node, "offset", &syscon_rbm->offset)) + return -EINVAL; + + of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); + + dev_set_drvdata(&pdev->dev, syscon_rbm); + + 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