Commit 3235d130 authored by Cristian Ciocaltea's avatar Cristian Ciocaltea Committed by Sebastian Reichel
Browse files

power: reset: Add poweroff driver for ATC260x PMICs 



This driver provides poweroff and reboot support for a system through
the ATC2603C and ATC2609A chip variants of the Actions Semi ATC260x
family of PMICs.

Signed-off-by: default avatarCristian Ciocaltea <cristian.ciocaltea@gmail.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 2f7cf24f

drivers/power/reset/Kconfig

+7 −1
Original line number Diff line number Diff line
@@ -39,6 +39,13 @@ config POWER_RESET_AT91_SAMA5D2_SHDWC 
	  This driver supports the alternate shutdown controller for some Atmel

	  SAMA5 SoCs. It is present for example on SAMA5D2 SoC.



config POWER_RESET_ATC260X

	tristate "Actions Semi ATC260x PMIC power-off driver"

	depends on MFD_ATC260X

	help

	  This driver provides power-off and restart support for a system

	  through Actions Semi ATC260x series PMICs.



config POWER_RESET_AXXIA

	bool "LSI Axxia reset driver"

	depends on ARCH_AXXIA
@@ -292,4 +299,3 @@ config NVMEM_REBOOT_MODE 
	  action according to the mode.



endif

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ obj-$(CONFIG_POWER_RESET_AS3722) += as3722-poweroff.o 
obj-$(CONFIG_POWER_RESET_AT91_POWEROFF) += at91-poweroff.o

obj-$(CONFIG_POWER_RESET_AT91_RESET) += at91-reset.o

obj-$(CONFIG_POWER_RESET_AT91_SAMA5D2_SHDWC) += at91-sama5d2_shdwc.o

obj-$(CONFIG_POWER_RESET_ATC260X) += atc260x-poweroff.o

obj-$(CONFIG_POWER_RESET_AXXIA) += axxia-reset.o

obj-$(CONFIG_POWER_RESET_BRCMKONA) += brcm-kona-reset.o

obj-$(CONFIG_POWER_RESET_BRCMSTB) += brcmstb-reboot.o

drivers/power/reset/atc260x-poweroff.c

0 → 100644
+262 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * Poweroff & reset driver for Actions Semi ATC260x PMICs

 *

 * Copyright (c) 2020 Cristian Ciocaltea <cristian.ciocaltea@gmail.com>

 */



#include <linux/delay.h>

#include <linux/mfd/atc260x/core.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/reboot.h>

#include <linux/regmap.h>



struct atc260x_pwrc {

	struct device *dev;

	struct regmap *regmap;

	struct notifier_block restart_nb;

	int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart);

};



/* Global variable needed only for pm_power_off */

static struct atc260x_pwrc *atc260x_pwrc_data;



static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)

{

	int ret, deep_sleep = 0;

	uint reg_mask, reg_val;



	/* S4-Deep Sleep Mode is NOT available for WALL/USB power */

	if (!restart && !power_supply_is_system_supplied()) {

		deep_sleep = 1;

		dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");

	}



	/* Update wakeup sources */

	reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |

		  (restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN

			   : ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);



	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,

				 ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val);

	if (ret)

		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);



	/* Update power mode */

	reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3;



	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask,

				 deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3);

	if (ret) {

		dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);

		return ret;

	}



	/* Trigger poweroff / restart sequence */

	reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN

			   : ATC2603C_PMU_SYS_CTL1_EN_S1;

	reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;



	ret = regmap_update_bits(pwrc->regmap,

				 restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,

				 reg_mask, reg_val);

	if (ret) {

		dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",

			restart ? 0 : 1, ret);

		return ret;

	}



	/* Wait for trigger completion */

	mdelay(200);



	return 0;

}



static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)

{

	int ret, deep_sleep = 0;

	uint reg_mask, reg_val;



	/* S4-Deep Sleep Mode is NOT available for WALL/USB power */

	if (!restart && !power_supply_is_system_supplied()) {

		deep_sleep = 1;

		dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");

	}



	/* Update wakeup sources */

	reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |

		  (restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN

			   : ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);



	ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,

				 ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val);

	if (ret)

		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);



	/* Update power mode */

	reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3;



	ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask,

				 deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3);

	if (ret) {

		dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);

		return ret;

	}



	/* Trigger poweroff / restart sequence */

	reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN

			   : ATC2609A_PMU_SYS_CTL1_EN_S1;

	reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;



	ret = regmap_update_bits(pwrc->regmap,

				 restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,

				 reg_mask, reg_val);

	if (ret) {

		dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",

			restart ? 0 : 1, ret);

		return ret;

	}



	/* Wait for trigger completion */

	mdelay(200);



	return 0;

}



static int atc2603c_init(const struct atc260x_pwrc *pwrc)

{

	int ret;



	/*

	 * Delay transition from S2/S3 to S1 in order to avoid

	 * DDR init failure in Bootloader.

	 */

	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3,

				 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN,

				 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN);

	if (ret)

		dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);



	/* Set wakeup sources */

	ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,

				 ATC2603C_PMU_SYS_CTL0_WK_ALL,

				 ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN |

				 ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);

	if (ret)

		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);



	return ret;

}



static int atc2609a_init(const struct atc260x_pwrc *pwrc)

{

	int ret;



	/* Set wakeup sources */

	ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,

				 ATC2609A_PMU_SYS_CTL0_WK_ALL,

				 ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN |

				 ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);

	if (ret)

		dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);



	return ret;

}



static void atc260x_pwrc_pm_handler(void)

{

	atc260x_pwrc_data->do_poweroff(atc260x_pwrc_data, false);



	WARN_ONCE(1, "Unable to power off system\n");

}



static int atc260x_pwrc_restart_handler(struct notifier_block *nb,

					unsigned long mode, void *cmd)

{

	struct atc260x_pwrc *pwrc = container_of(nb, struct atc260x_pwrc,

						 restart_nb);

	pwrc->do_poweroff(pwrc, true);



	return NOTIFY_DONE;

}



static int atc260x_pwrc_probe(struct platform_device *pdev)

{

	struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent);

	struct atc260x_pwrc *priv;

	int ret;



	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return -ENOMEM;



	priv->dev = &pdev->dev;

	priv->regmap = atc260x->regmap;

	priv->restart_nb.notifier_call = atc260x_pwrc_restart_handler;

	priv->restart_nb.priority = 192;



	switch (atc260x->ic_type) {

	case ATC2603C:

		priv->do_poweroff = atc2603c_do_poweroff;

		ret = atc2603c_init(priv);

		break;

	case ATC2609A:

		priv->do_poweroff = atc2609a_do_poweroff;

		ret = atc2609a_init(priv);

		break;

	default:

		dev_err(priv->dev,

			"Poweroff not supported for ATC260x PMIC type: %u\n",

			atc260x->ic_type);

		return -EINVAL;

	}



	if (ret)

		return ret;



	platform_set_drvdata(pdev, priv);



	if (!pm_power_off) {

		atc260x_pwrc_data = priv;

		pm_power_off = atc260x_pwrc_pm_handler;

	} else {

		dev_warn(priv->dev, "Poweroff callback already assigned\n");

	}



	ret = register_restart_handler(&priv->restart_nb);

	if (ret)

		dev_err(priv->dev, "failed to register restart handler: %d\n",

			ret);



	return ret;

}



static int atc260x_pwrc_remove(struct platform_device *pdev)

{

	struct atc260x_pwrc *priv = platform_get_drvdata(pdev);



	if (atc260x_pwrc_data == priv) {

		pm_power_off = NULL;

		atc260x_pwrc_data = NULL;

	}



	unregister_restart_handler(&priv->restart_nb);



	return 0;

}



static struct platform_driver atc260x_pwrc_driver = {

	.probe = atc260x_pwrc_probe,

	.remove = atc260x_pwrc_remove,

	.driver = {

		.name = "atc260x-pwrc",

	},

};



module_platform_driver(atc260x_pwrc_driver);



MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs");

MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");

MODULE_LICENSE("GPL");