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Commit 78be3176 authored by Abhimanyu Kapur's avatar Abhimanyu Kapur Committed by Anton Vorontsov
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power: reset: Add msm restart support 



Add support for restart and poweroff functionality present on MSM chipsets
with the MPM2 ps-hold hardware.

Signed-off-by: default avatarAbhimanyu Kapur <abhimany@codeaurora.org>
Tested-by: default avatarIvan T. Ivanov <iivanov@mm-sol.com>
Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarAnton Vorontsov <anton@enomsg.org>
parent 68ace3e1

Documentation/devicetree/bindings/power_supply/msm-poweroff.txt

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MSM Restart Driver



A power supply hold (ps-hold) bit is set to power the msm chipsets.

Clearing that bit allows 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@fc4ab000 {

		compatible = "qcom,pshold";

		reg = <0xfc4ab000 0x4>;

	};

drivers/power/reset/Kconfig

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@@ -14,6 +14,12 @@ config POWER_RESET_GPIO 
	  If your board needs a GPIO high/low to power down, say Y and

	  create a binding in your devicetree.



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.



config POWER_RESET_QNAP

	bool "QNAP power-off driver"

	depends on OF_GPIO && POWER_RESET && PLAT_ORION

drivers/power/reset/Makefile

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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

drivers/power/reset/msm-poweroff.c

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/* 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 <linux/delay.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/module.h>

#include <linux/reboot.h>



#include <asm/system_misc.h>



static void __iomem *msm_ps_hold;



static void do_msm_restart(enum reboot_mode reboot_mode, const char *cmd)

{

	writel(0, msm_ps_hold);

	mdelay(10000);

}



static void do_msm_poweroff(void)

{

	/* TODO: Add poweroff capability */

	do_msm_restart(REBOOT_HARD, 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);