tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: 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>
authored by
Abhimanyu Kapur
and committed by
Anton Vorontsov
78be3176
68ace3e1
+97
+17
Documentation/devicetree/bindings/power_supply/msm-poweroff.txt
+17
Documentation/devicetree/bindings/power_supply/msm-poweroff.txt
···
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MSM Restart Driver
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A power supply hold (ps-hold) bit is set to power the msm chipsets.
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Clearing that bit allows us to restart/poweroff. The difference
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between poweroff and restart is determined by unique power manager IC
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settings.
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Required Properties:
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-compatible: "qcom,pshold"
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-reg: Specifies the physical address of the ps-hold register
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Example:
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restart@fc4ab000 {
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compatible = "qcom,pshold";
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reg = <0xfc4ab000 0x4>;
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};
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drivers/power/reset/Kconfig
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drivers/power/reset/Kconfig
···
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If your board needs a GPIO high/low to power down, say Y and
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create a binding in your devicetree.
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config POWER_RESET_MSM
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bool "Qualcomm MSM power-off driver"
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depends on POWER_RESET && ARCH_MSM
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help
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Power off and restart support for Qualcomm boards.
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config POWER_RESET_QNAP
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bool "QNAP power-off driver"
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depends on OF_GPIO && POWER_RESET && PLAT_ORION
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drivers/power/reset/Makefile
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drivers/power/reset/Makefile
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drivers/power/reset/msm-poweroff.c
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drivers/power/reset/msm-poweroff.c
···
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/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <asm/system_misc.h>
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static void __iomem *msm_ps_hold;
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static void do_msm_restart(enum reboot_mode reboot_mode, const char *cmd)
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{
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writel(0, msm_ps_hold);
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mdelay(10000);
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}
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static void do_msm_poweroff(void)
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{
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/* TODO: Add poweroff capability */
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do_msm_restart(REBOOT_HARD, NULL);
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}
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static int msm_restart_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *mem;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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msm_ps_hold = devm_ioremap_resource(dev, mem);
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if (IS_ERR(msm_ps_hold))
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return PTR_ERR(msm_ps_hold);
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pm_power_off = do_msm_poweroff;
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arm_pm_restart = do_msm_restart;
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return 0;
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}
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static const struct of_device_id of_msm_restart_match[] = {
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{ .compatible = "qcom,pshold", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_msm_restart_match);
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static struct platform_driver msm_restart_driver = {
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.probe = msm_restart_probe,
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.driver = {
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.name = "msm-restart",
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.of_match_table = of_match_ptr(of_msm_restart_match),
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},
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};
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static int __init msm_restart_init(void)
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{
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return platform_driver_register(&msm_restart_driver);
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}
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device_initcall(msm_restart_init);