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// 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 void 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);
}
static struct platform_driver atc260x_pwrc_driver = {
.probe = atc260x_pwrc_probe,
.remove_new = 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");
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