263 lines
6.8 KiB
C
263 lines
6.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Poweroff & reset driver for Actions Semi ATC260x PMICs
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*
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* Copyright (c) 2020 Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
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*/
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#include <linux/delay.h>
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#include <linux/mfd/atc260x/core.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/reboot.h>
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#include <linux/regmap.h>
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struct atc260x_pwrc {
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struct device *dev;
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struct regmap *regmap;
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struct notifier_block restart_nb;
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int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart);
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};
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/* Global variable needed only for pm_power_off */
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static struct atc260x_pwrc *atc260x_pwrc_data;
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static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
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{
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int ret, deep_sleep = 0;
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uint reg_mask, reg_val;
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/* S4-Deep Sleep Mode is NOT available for WALL/USB power */
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if (!restart && !power_supply_is_system_supplied()) {
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deep_sleep = 1;
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dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
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}
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/* Update wakeup sources */
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reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
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(restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN
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: ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
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ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val);
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if (ret)
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
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/* Update power mode */
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reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3;
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask,
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deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3);
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if (ret) {
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dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
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return ret;
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}
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/* Trigger poweroff / restart sequence */
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reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN
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: ATC2603C_PMU_SYS_CTL1_EN_S1;
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reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;
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ret = regmap_update_bits(pwrc->regmap,
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restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,
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reg_mask, reg_val);
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if (ret) {
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dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
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restart ? 0 : 1, ret);
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return ret;
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}
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/* Wait for trigger completion */
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mdelay(200);
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return 0;
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}
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static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
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{
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int ret, deep_sleep = 0;
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uint reg_mask, reg_val;
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/* S4-Deep Sleep Mode is NOT available for WALL/USB power */
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if (!restart && !power_supply_is_system_supplied()) {
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deep_sleep = 1;
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dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
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}
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/* Update wakeup sources */
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reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
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(restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN
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: ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
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ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
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ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val);
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if (ret)
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
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/* Update power mode */
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reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3;
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ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask,
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deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3);
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if (ret) {
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dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
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return ret;
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}
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/* Trigger poweroff / restart sequence */
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reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN
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: ATC2609A_PMU_SYS_CTL1_EN_S1;
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reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;
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ret = regmap_update_bits(pwrc->regmap,
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restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,
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reg_mask, reg_val);
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if (ret) {
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dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
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restart ? 0 : 1, ret);
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return ret;
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}
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/* Wait for trigger completion */
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mdelay(200);
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return 0;
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}
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static int atc2603c_init(const struct atc260x_pwrc *pwrc)
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{
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int ret;
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/*
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* Delay transition from S2/S3 to S1 in order to avoid
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* DDR init failure in Bootloader.
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*/
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3,
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ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN,
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ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN);
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if (ret)
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dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
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/* Set wakeup sources */
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ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
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ATC2603C_PMU_SYS_CTL0_WK_ALL,
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ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN |
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ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
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if (ret)
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
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return ret;
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}
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static int atc2609a_init(const struct atc260x_pwrc *pwrc)
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{
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int ret;
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/* Set wakeup sources */
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ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
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ATC2609A_PMU_SYS_CTL0_WK_ALL,
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ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN |
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ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
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if (ret)
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dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
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return ret;
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}
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static void atc260x_pwrc_pm_handler(void)
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{
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atc260x_pwrc_data->do_poweroff(atc260x_pwrc_data, false);
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WARN_ONCE(1, "Unable to power off system\n");
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}
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static int atc260x_pwrc_restart_handler(struct notifier_block *nb,
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unsigned long mode, void *cmd)
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{
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struct atc260x_pwrc *pwrc = container_of(nb, struct atc260x_pwrc,
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restart_nb);
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pwrc->do_poweroff(pwrc, true);
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return NOTIFY_DONE;
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}
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static int atc260x_pwrc_probe(struct platform_device *pdev)
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{
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struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent);
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struct atc260x_pwrc *priv;
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int ret;
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = &pdev->dev;
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priv->regmap = atc260x->regmap;
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priv->restart_nb.notifier_call = atc260x_pwrc_restart_handler;
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priv->restart_nb.priority = 192;
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switch (atc260x->ic_type) {
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case ATC2603C:
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priv->do_poweroff = atc2603c_do_poweroff;
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ret = atc2603c_init(priv);
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break;
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case ATC2609A:
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priv->do_poweroff = atc2609a_do_poweroff;
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ret = atc2609a_init(priv);
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break;
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default:
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dev_err(priv->dev,
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"Poweroff not supported for ATC260x PMIC type: %u\n",
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atc260x->ic_type);
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return -EINVAL;
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}
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if (ret)
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return ret;
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platform_set_drvdata(pdev, priv);
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if (!pm_power_off) {
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atc260x_pwrc_data = priv;
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pm_power_off = atc260x_pwrc_pm_handler;
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} else {
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dev_warn(priv->dev, "Poweroff callback already assigned\n");
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}
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ret = register_restart_handler(&priv->restart_nb);
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if (ret)
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dev_err(priv->dev, "failed to register restart handler: %d\n",
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ret);
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return ret;
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}
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static int atc260x_pwrc_remove(struct platform_device *pdev)
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{
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struct atc260x_pwrc *priv = platform_get_drvdata(pdev);
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if (atc260x_pwrc_data == priv) {
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pm_power_off = NULL;
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atc260x_pwrc_data = NULL;
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}
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unregister_restart_handler(&priv->restart_nb);
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return 0;
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}
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static struct platform_driver atc260x_pwrc_driver = {
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.probe = atc260x_pwrc_probe,
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.remove = atc260x_pwrc_remove,
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.driver = {
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.name = "atc260x-pwrc",
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},
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};
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module_platform_driver(atc260x_pwrc_driver);
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MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs");
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MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");
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MODULE_LICENSE("GPL");
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