1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Poweroff & reset driver for Actions Semi ATC260x PMICs
4 *
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_EN
36 : ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
37
38 ret = regmap_update_bits(map: pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
39 ATC2603C_PMU_SYS_CTL0_WK_ALL, val: 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(map: pwrc->regmap, ATC2603C_PMU_SYS_CTL3, mask: reg_mask,
47 val: 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_EN
55 : ATC2603C_PMU_SYS_CTL1_EN_S1;
56 reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;
57
58 ret = regmap_update_bits(map: pwrc->regmap,
59 reg: restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,
60 mask: reg_mask, val: 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_EN
87 : ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
88
89 ret = regmap_update_bits(map: pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
90 ATC2609A_PMU_SYS_CTL0_WK_ALL, val: 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(map: pwrc->regmap, ATC2609A_PMU_SYS_CTL3, mask: reg_mask,
98 val: 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_EN
106 : ATC2609A_PMU_SYS_CTL1_EN_S1;
107 reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;
108
109 ret = regmap_update_bits(map: pwrc->regmap,
110 reg: restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,
111 mask: reg_mask, val: 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 avoid
130 * DDR init failure in Bootloader.
131 */
132 ret = regmap_update_bits(map: 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(map: 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(map: 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(dev: pdev->dev.parent);
186 struct atc260x_pwrc *priv;
187 int ret;
188
189 priv = devm_kzalloc(dev: &pdev->dev, size: 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(pwrc: priv);
200 break;
201 case ATC2609A:
202 priv->do_poweroff = atc2609a_do_poweroff;
203 ret = atc2609a_init(pwrc: 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(dev: priv->dev,
216 mode: SYS_OFF_MODE_POWER_OFF,
217 SYS_OFF_PRIO_DEFAULT,
218 callback: atc260x_pwrc_pm_handler,
219 cb_data: 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(dev: priv->dev,
225 mode: SYS_OFF_MODE_RESTART,
226 SYS_OFF_PRIO_HIGH,
227 callback: atc260x_pwrc_restart_handler,
228 cb_data: 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

source code of linux/drivers/power/reset/atc260x-poweroff.c