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power: reset: Add msm restart support

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

Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>
Tested-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>
This commit is contained in:
Abhimanyu Kapur 2013-07-30 17:05:28 -07:00 committed by Anton Vorontsov
parent 68ace3e188
commit 78be3176c4
4 changed files with 97 additions and 0 deletions
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17
Documentation/devicetree/bindings/power_supply/msm-poweroff.txt Normal file
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@ -0,0 +1,17 @@
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>;
};

6
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

1
drivers/power/reset/Makefile
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@ -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

73
drivers/power/reset/msm-poweroff.c Normal file
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@ -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 <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);