From patchwork Mon Jul 29 22:28:26 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abhimanyu Kapur X-Patchwork-Id: 2835167 Return-Path: X-Original-To: patchwork-linux-arm-msm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 2DAD7C0319 for ; Mon, 29 Jul 2013 22:28:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2665520352 for ; Mon, 29 Jul 2013 22:28:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1F84F2034F for ; Mon, 29 Jul 2013 22:28:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755090Ab3G2W2f (ORCPT ); Mon, 29 Jul 2013 18:28:35 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:47934 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754183Ab3G2W2e (ORCPT ); Mon, 29 Jul 2013 18:28:34 -0400 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id F194713EC78; Mon, 29 Jul 2013 22:28:33 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id E208D13EF88; Mon, 29 Jul 2013 22:28:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-8.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from codeaurora.org (i-global252.qualcomm.com [199.106.103.252]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: abhimany@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 8B3F113EC78; Mon, 29 Jul 2013 22:28:32 +0000 (UTC) From: Abhimanyu Kapur To: Anton Vorontsov Cc: devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, sboyd@codeaurora.org Subject: [PATCH] drivers: power: reset: add msm restart support Date: Mon, 29 Jul 2013 15:28:26 -0700 Message-Id: <1375136906-22501-1-git-send-email-abhimany@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add support for restart and poweroff functionality present on MSM chipsets with the MPM2 ps-hold hardware. Signed-off-by: Abhimanyu Kapur --- .../bindings/power_supply/msm-poweroff.txt | 17 +++++ drivers/power/reset/Kconfig | 6 ++ drivers/power/reset/Makefile | 1 + drivers/power/reset/msm-poweroff.c | 73 ++++++++++++++++++++++ 4 files changed, 97 insertions(+) create mode 100644 Documentation/devicetree/bindings/power_supply/msm-poweroff.txt create mode 100644 drivers/power/reset/msm-poweroff.c diff --git a/Documentation/devicetree/bindings/power_supply/msm-poweroff.txt b/Documentation/devicetree/bindings/power_supply/msm-poweroff.txt new file mode 100644 index 0000000..de08480 --- /dev/null +++ b/Documentation/devicetree/bindings/power_supply/msm-poweroff.txt @@ -0,0 +1,17 @@ +MSM Poweroff Driver + +A power supply hold (ps-hold) bit is set to power the msm chipsets. +Clearing that bit enables us to restart/poweroff. The difference +between poweroff and restart is determined by unique power manager IC +settings. + +Required Properties: +-compatible: "qcom,pshold" +-reg: Specifies the physical address of the ps-hold register + +Example: + + restart@800820 { + compatible = "qcom,pshold"; + reg = <0x00800820 0x4>; + }; diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 349e9ae..fa6178f 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -37,3 +37,9 @@ config POWER_RESET_VEXPRESS help Power off and reset support for the ARM Ltd. Versatile Express boards. + +config POWER_RESET_MSM + bool "Qualcomm MSM power-off driver" + depends on POWER_RESET && ARCH_MSM + help + Power off and restart support for Qualcomm boards. diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 372807f..b82288e 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o +obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o diff --git a/drivers/power/reset/msm-poweroff.c b/drivers/power/reset/msm-poweroff.c new file mode 100644 index 0000000..0d33d18 --- /dev/null +++ b/drivers/power/reset/msm-poweroff.c @@ -0,0 +1,73 @@ +/* Copyright (c) 2013, The Linux Foundation. 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 version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +static void __iomem *msm_ps_hold; + +static void do_msm_restart(char mode, const char *cmd) +{ + writel(0, msm_ps_hold); + mdelay(10000); +} + +static void do_msm_poweroff(void) +{ + /* TODO: Add poweroff capability */ + + do_msm_restart('p', NULL); +} + +static int msm_restart_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *mem; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + msm_ps_hold = devm_ioremap_resource(dev, mem); + if (IS_ERR(msm_ps_hold)) + return PTR_ERR(msm_ps_hold); + + pm_power_off = do_msm_poweroff; + arm_pm_restart = do_msm_restart; + return 0; +} + +static const struct of_device_id of_msm_restart_match[] = { + { .compatible = "qcom,pshold", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, of_msm_restart_match); + +static struct platform_driver msm_restart_driver = { + .probe = msm_restart_probe, + .driver = { + .name = "msm-restart", + .of_match_table = of_match_ptr(of_msm_restart_match), + }, +}; + +static int __init msm_restart_init(void) +{ + return platform_driver_register(&msm_restart_driver); +} +device_initcall(msm_restart_init);