Commit f0745f36 authored by Lee Jones's avatar Lee Jones Committed by Sebastian Reichel
Browse files

power: reset: Add restart functionality for STiH41x platforms 



This driver adds the restart functionality for STiH415 and STiH416
platforms from STMicroelectronics.  This driver registers an
arm_pm_restart function to reset the platform.

Signed-off-by: default avatarChristophe Kerello <christophe.kerello@st.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarSebastian Reichel <sre@kernel.org>
parent 661a8886

drivers/power/reset/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -82,6 +82,12 @@ config POWER_RESET_SUN6I 
	help

	  Reboot support for the Allwinner A31 SoCs.



config POWER_RESET_ST

	bool "ST restart power-off driver"

	depends on POWER_RESET && ARCH_STI

	help

	  Power off and reset support for STMicroelectronics boards.



config POWER_RESET_VEXPRESS

	bool "ARM Versatile Express power-off and reset driver"

	depends on ARM || ARM64

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o 
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o

obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o

obj-$(CONFIG_POWER_RESET_SUN6I) += sun6i-reboot.o

obj-$(CONFIG_POWER_RESET_ST) += st-poweroff.o

obj-$(CONFIG_POWER_RESET_VEXPRESS) += vexpress-poweroff.o

obj-$(CONFIG_POWER_RESET_XGENE) += xgene-reboot.o

obj-$(CONFIG_POWER_RESET_KEYSTONE) += keystone-reset.o

drivers/power/reset/st-poweroff.c

0 → 100644
+151 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2014 STMicroelectronics

 *

 * Power off Restart driver, used in STMicroelectronics devices.

 *

 * Author: Christophe Kerello <christophe.kerello@st.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2, as

 * published by the Free Software Foundation.

 */



#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/mfd/syscon.h>

#include <linux/regmap.h>



#include <asm/system_misc.h>



struct reset_syscfg {

	struct regmap *regmap;

	/* syscfg used for reset */

	unsigned int offset_rst;

	unsigned int mask_rst;

	/* syscfg used for unmask the reset */

	unsigned int offset_rst_msk;

	unsigned int mask_rst_msk;

};



/* STiH415 */

#define STIH415_SYSCFG_11	0x2c

#define STIH415_SYSCFG_15	0x3c



static struct reset_syscfg stih415_reset = {

	.offset_rst = STIH415_SYSCFG_11,

	.mask_rst = BIT(0),

	.offset_rst_msk = STIH415_SYSCFG_15,

	.mask_rst_msk = BIT(0)

};



/* STiH416 */

#define STIH416_SYSCFG_500	0x7d0

#define STIH416_SYSCFG_504	0x7e0



static struct reset_syscfg stih416_reset = {

	.offset_rst = STIH416_SYSCFG_500,

	.mask_rst = BIT(0),

	.offset_rst_msk = STIH416_SYSCFG_504,

	.mask_rst_msk = BIT(0)

};



/* STiH407 */

#define STIH407_SYSCFG_4000	0x0

#define STIH407_SYSCFG_4008	0x20



static struct reset_syscfg stih407_reset = {

	.offset_rst = STIH407_SYSCFG_4000,

	.mask_rst = BIT(0),

	.offset_rst_msk = STIH407_SYSCFG_4008,

	.mask_rst_msk = BIT(0)

};



/* STiD127 */

#define STID127_SYSCFG_700	0x0

#define STID127_SYSCFG_773	0x124



static struct reset_syscfg stid127_reset = {

	.offset_rst = STID127_SYSCFG_773,

	.mask_rst = BIT(0),

	.offset_rst_msk = STID127_SYSCFG_700,

	.mask_rst_msk = BIT(8)

};



static struct reset_syscfg *st_restart_syscfg;



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

{

	/* reset syscfg updated */

	regmap_update_bits(st_restart_syscfg->regmap,

			   st_restart_syscfg->offset_rst,

			   st_restart_syscfg->mask_rst,

			   0);



	/* unmask the reset */

	regmap_update_bits(st_restart_syscfg->regmap,

			   st_restart_syscfg->offset_rst_msk,

			   st_restart_syscfg->mask_rst_msk,

			   0);

}



static struct of_device_id st_reset_of_match[] = {

	{

		.compatible = "st,stih415-restart",

		.data = (void *)&stih415_reset,

	}, {

		.compatible = "st,stih416-restart",

		.data = (void *)&stih416_reset,

	}, {

		.compatible = "st,stih407-restart",

		.data = (void *)&stih407_reset,

	}, {

		.compatible = "st,stid127-restart",

		.data = (void *)&stid127_reset,

	},

	{}

};



static int st_reset_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;

	const struct of_device_id *match;

	struct device *dev = &pdev->dev;



	match = of_match_device(st_reset_of_match, dev);

	if (!match)

		return -ENODEV;



	st_restart_syscfg = (struct reset_syscfg *)match->data;



	st_restart_syscfg->regmap =

		syscon_regmap_lookup_by_phandle(np, "st,syscfg");

	if (IS_ERR(st_restart_syscfg->regmap)) {

		dev_err(dev, "No syscfg phandle specified\n");

		return PTR_ERR(st_restart_syscfg->regmap);

	}



	arm_pm_restart = st_restart;



	return 0;

}



static struct platform_driver st_reset_driver = {

	.probe = st_reset_probe,

	.driver = {

		.name = "st_reset",

		.of_match_table = st_reset_of_match,

	},

};



static int __init st_reset_init(void)

{

	return platform_driver_register(&st_reset_driver);

}



device_initcall(st_reset_init);



MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>");

MODULE_DESCRIPTION("STMicroelectronics Power off Restart driver");

MODULE_LICENSE("GPL v2");

CRA Git | Maintained and supported by SUSTech CRA and CCSE