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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Poweroff & reset driver for Actions Semi ATC260x PMICs4 *5 * Copyright (c) 2020 Cristian Ciocaltea <cristian.ciocaltea@gmail.com>6 */7 8#include <linux/delay.h>9#include <linux/mfd/atc260x/core.h>10#include <linux/module.h>11#include <linux/platform_device.h>12#include <linux/power_supply.h>13#include <linux/reboot.h>14#include <linux/regmap.h>15 16struct atc260x_pwrc {17 struct device *dev;18 struct regmap *regmap;19 int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart);20};21 22static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)23{24 int ret, deep_sleep = 0;25 uint reg_mask, reg_val;26 27 /* S4-Deep Sleep Mode is NOT available for WALL/USB power */28 if (!restart && !power_supply_is_system_supplied()) {29 deep_sleep = 1;30 dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");31 }32 33 /* Update wakeup sources */34 reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |35 (restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN36 : ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);37 38 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,39 ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val);40 if (ret)41 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);42 43 /* Update power mode */44 reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3;45 46 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask,47 deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3);48 if (ret) {49 dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);50 return ret;51 }52 53 /* Trigger poweroff / restart sequence */54 reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN55 : ATC2603C_PMU_SYS_CTL1_EN_S1;56 reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;57 58 ret = regmap_update_bits(pwrc->regmap,59 restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,60 reg_mask, reg_val);61 if (ret) {62 dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",63 restart ? 0 : 1, ret);64 return ret;65 }66 67 /* Wait for trigger completion */68 mdelay(200);69 70 return 0;71}72 73static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)74{75 int ret, deep_sleep = 0;76 uint reg_mask, reg_val;77 78 /* S4-Deep Sleep Mode is NOT available for WALL/USB power */79 if (!restart && !power_supply_is_system_supplied()) {80 deep_sleep = 1;81 dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");82 }83 84 /* Update wakeup sources */85 reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |86 (restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN87 : ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);88 89 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,90 ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val);91 if (ret)92 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);93 94 /* Update power mode */95 reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3;96 97 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask,98 deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3);99 if (ret) {100 dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);101 return ret;102 }103 104 /* Trigger poweroff / restart sequence */105 reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN106 : ATC2609A_PMU_SYS_CTL1_EN_S1;107 reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;108 109 ret = regmap_update_bits(pwrc->regmap,110 restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,111 reg_mask, reg_val);112 if (ret) {113 dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",114 restart ? 0 : 1, ret);115 return ret;116 }117 118 /* Wait for trigger completion */119 mdelay(200);120 121 return 0;122}123 124static int atc2603c_init(const struct atc260x_pwrc *pwrc)125{126 int ret;127 128 /*129 * Delay transition from S2/S3 to S1 in order to avoid130 * DDR init failure in Bootloader.131 */132 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3,133 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN,134 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN);135 if (ret)136 dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);137 138 /* Set wakeup sources */139 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,140 ATC2603C_PMU_SYS_CTL0_WK_ALL,141 ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN |142 ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);143 if (ret)144 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);145 146 return ret;147}148 149static int atc2609a_init(const struct atc260x_pwrc *pwrc)150{151 int ret;152 153 /* Set wakeup sources */154 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,155 ATC2609A_PMU_SYS_CTL0_WK_ALL,156 ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN |157 ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);158 if (ret)159 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);160 161 return ret;162}163 164static int atc260x_pwrc_pm_handler(struct sys_off_data *data)165{166 struct atc260x_pwrc *pwrc = data->cb_data;167 168 pwrc->do_poweroff(pwrc, false);169 170 WARN_ONCE(1, "Unable to power off system\n");171 172 return NOTIFY_DONE;173}174 175static int atc260x_pwrc_restart_handler(struct sys_off_data *data)176{177 struct atc260x_pwrc *pwrc = data->cb_data;178 pwrc->do_poweroff(pwrc, true);179 180 return NOTIFY_DONE;181}182 183static int atc260x_pwrc_probe(struct platform_device *pdev)184{185 struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent);186 struct atc260x_pwrc *priv;187 int ret;188 189 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);190 if (!priv)191 return -ENOMEM;192 193 priv->dev = &pdev->dev;194 priv->regmap = atc260x->regmap;195 196 switch (atc260x->ic_type) {197 case ATC2603C:198 priv->do_poweroff = atc2603c_do_poweroff;199 ret = atc2603c_init(priv);200 break;201 case ATC2609A:202 priv->do_poweroff = atc2609a_do_poweroff;203 ret = atc2609a_init(priv);204 break;205 default:206 dev_err(priv->dev,207 "Poweroff not supported for ATC260x PMIC type: %u\n",208 atc260x->ic_type);209 return -EINVAL;210 }211 212 if (ret)213 return ret;214 215 ret = devm_register_sys_off_handler(priv->dev,216 SYS_OFF_MODE_POWER_OFF,217 SYS_OFF_PRIO_DEFAULT,218 atc260x_pwrc_pm_handler,219 priv);220 if (ret)221 dev_err(priv->dev, "failed to register power-off handler: %d\n",222 ret);223 224 ret = devm_register_sys_off_handler(priv->dev,225 SYS_OFF_MODE_RESTART,226 SYS_OFF_PRIO_HIGH,227 atc260x_pwrc_restart_handler,228 priv);229 if (ret)230 dev_err(priv->dev, "failed to register restart handler: %d\n",231 ret);232 233 return ret;234}235 236static struct platform_driver atc260x_pwrc_driver = {237 .probe = atc260x_pwrc_probe,238 .driver = {239 .name = "atc260x-pwrc",240 },241};242 243module_platform_driver(atc260x_pwrc_driver);244 245MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs");246MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");247MODULE_LICENSE("GPL");248