From mboxrd@z Thu Jan 1 00:00:00 1970 From: Abhimanyu Kapur 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> Return-path: 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 Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: Anton Vorontsov Cc: devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, sboyd@codeaurora.org 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); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation