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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 struct notifier_block restart_nb;
20 int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart);
21};
22
23/* Global variable needed only for pm_power_off */
24static struct atc260x_pwrc *atc260x_pwrc_data;
25
26static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
27{
28 int ret, deep_sleep = 0;
29 uint reg_mask, reg_val;
30
31 /* S4-Deep Sleep Mode is NOT available for WALL/USB power */
32 if (!restart && !power_supply_is_system_supplied()) {
33 deep_sleep = 1;
34 dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
35 }
36
37 /* Update wakeup sources */
38 reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
39 (restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN
40 : ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
41
42 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
43 ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val);
44 if (ret)
45 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
46
47 /* Update power mode */
48 reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3;
49
50 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask,
51 deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3);
52 if (ret) {
53 dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
54 return ret;
55 }
56
57 /* Trigger poweroff / restart sequence */
58 reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN
59 : ATC2603C_PMU_SYS_CTL1_EN_S1;
60 reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;
61
62 ret = regmap_update_bits(pwrc->regmap,
63 restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,
64 reg_mask, reg_val);
65 if (ret) {
66 dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
67 restart ? 0 : 1, ret);
68 return ret;
69 }
70
71 /* Wait for trigger completion */
72 mdelay(200);
73
74 return 0;
75}
76
77static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
78{
79 int ret, deep_sleep = 0;
80 uint reg_mask, reg_val;
81
82 /* S4-Deep Sleep Mode is NOT available for WALL/USB power */
83 if (!restart && !power_supply_is_system_supplied()) {
84 deep_sleep = 1;
85 dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
86 }
87
88 /* Update wakeup sources */
89 reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
90 (restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN
91 : ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
92
93 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
94 ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val);
95 if (ret)
96 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
97
98 /* Update power mode */
99 reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3;
100
101 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask,
102 deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3);
103 if (ret) {
104 dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
105 return ret;
106 }
107
108 /* Trigger poweroff / restart sequence */
109 reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN
110 : ATC2609A_PMU_SYS_CTL1_EN_S1;
111 reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;
112
113 ret = regmap_update_bits(pwrc->regmap,
114 restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,
115 reg_mask, reg_val);
116 if (ret) {
117 dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
118 restart ? 0 : 1, ret);
119 return ret;
120 }
121
122 /* Wait for trigger completion */
123 mdelay(200);
124
125 return 0;
126}
127
128static int atc2603c_init(const struct atc260x_pwrc *pwrc)
129{
130 int ret;
131
132 /*
133 * Delay transition from S2/S3 to S1 in order to avoid
134 * DDR init failure in Bootloader.
135 */
136 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3,
137 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN,
138 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN);
139 if (ret)
140 dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
141
142 /* Set wakeup sources */
143 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
144 ATC2603C_PMU_SYS_CTL0_WK_ALL,
145 ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN |
146 ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
147 if (ret)
148 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
149
150 return ret;
151}
152
153static int atc2609a_init(const struct atc260x_pwrc *pwrc)
154{
155 int ret;
156
157 /* Set wakeup sources */
158 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
159 ATC2609A_PMU_SYS_CTL0_WK_ALL,
160 ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN |
161 ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
162 if (ret)
163 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
164
165 return ret;
166}
167
168static void atc260x_pwrc_pm_handler(void)
169{
170 atc260x_pwrc_data->do_poweroff(atc260x_pwrc_data, false);
171
172 WARN_ONCE(1, "Unable to power off system\n");
173}
174
175static int atc260x_pwrc_restart_handler(struct notifier_block *nb,
176 unsigned long mode, void *cmd)
177{
178 struct atc260x_pwrc *pwrc = container_of(nb, struct atc260x_pwrc,
179 restart_nb);
180 pwrc->do_poweroff(pwrc, true);
181
182 return NOTIFY_DONE;
183}
184
185static int atc260x_pwrc_probe(struct platform_device *pdev)
186{
187 struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent);
188 struct atc260x_pwrc *priv;
189 int ret;
190
191 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
192 if (!priv)
193 return -ENOMEM;
194
195 priv->dev = &pdev->dev;
196 priv->regmap = atc260x->regmap;
197 priv->restart_nb.notifier_call = atc260x_pwrc_restart_handler;
198 priv->restart_nb.priority = 192;
199
200 switch (atc260x->ic_type) {
201 case ATC2603C:
202 priv->do_poweroff = atc2603c_do_poweroff;
203 ret = atc2603c_init(priv);
204 break;
205 case ATC2609A:
206 priv->do_poweroff = atc2609a_do_poweroff;
207 ret = atc2609a_init(priv);
208 break;
209 default:
210 dev_err(priv->dev,
211 "Poweroff not supported for ATC260x PMIC type: %u\n",
212 atc260x->ic_type);
213 return -EINVAL;
214 }
215
216 if (ret)
217 return ret;
218
219 platform_set_drvdata(pdev, priv);
220
221 if (!pm_power_off) {
222 atc260x_pwrc_data = priv;
223 pm_power_off = atc260x_pwrc_pm_handler;
224 } else {
225 dev_warn(priv->dev, "Poweroff callback already assigned\n");
226 }
227
228 ret = register_restart_handler(&priv->restart_nb);
229 if (ret)
230 dev_err(priv->dev, "failed to register restart handler: %d\n",
231 ret);
232
233 return ret;
234}
235
236static void atc260x_pwrc_remove(struct platform_device *pdev)
237{
238 struct atc260x_pwrc *priv = platform_get_drvdata(pdev);
239
240 if (atc260x_pwrc_data == priv) {
241 pm_power_off = NULL;
242 atc260x_pwrc_data = NULL;
243 }
244
245 unregister_restart_handler(&priv->restart_nb);
246}
247
248static struct platform_driver atc260x_pwrc_driver = {
249 .probe = atc260x_pwrc_probe,
250 .remove_new = atc260x_pwrc_remove,
251 .driver = {
252 .name = "atc260x-pwrc",
253 },
254};
255
256module_platform_driver(atc260x_pwrc_driver);
257
258MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs");
259MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");
260MODULE_LICENSE("GPL");
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 struct notifier_block restart_nb;
20 int (*do_poweroff)(const struct atc260x_pwrc *pwrc, bool restart);
21};
22
23/* Global variable needed only for pm_power_off */
24static struct atc260x_pwrc *atc260x_pwrc_data;
25
26static int atc2603c_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
27{
28 int ret, deep_sleep = 0;
29 uint reg_mask, reg_val;
30
31 /* S4-Deep Sleep Mode is NOT available for WALL/USB power */
32 if (!restart && !power_supply_is_system_supplied()) {
33 deep_sleep = 1;
34 dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
35 }
36
37 /* Update wakeup sources */
38 reg_val = ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
39 (restart ? ATC2603C_PMU_SYS_CTL0_RESET_WK_EN
40 : ATC2603C_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
41
42 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
43 ATC2603C_PMU_SYS_CTL0_WK_ALL, reg_val);
44 if (ret)
45 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
46
47 /* Update power mode */
48 reg_mask = ATC2603C_PMU_SYS_CTL3_EN_S2 | ATC2603C_PMU_SYS_CTL3_EN_S3;
49
50 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3, reg_mask,
51 deep_sleep ? 0 : ATC2603C_PMU_SYS_CTL3_EN_S3);
52 if (ret) {
53 dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
54 return ret;
55 }
56
57 /* Trigger poweroff / restart sequence */
58 reg_mask = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN
59 : ATC2603C_PMU_SYS_CTL1_EN_S1;
60 reg_val = restart ? ATC2603C_PMU_SYS_CTL0_RESTART_EN : 0;
61
62 ret = regmap_update_bits(pwrc->regmap,
63 restart ? ATC2603C_PMU_SYS_CTL0 : ATC2603C_PMU_SYS_CTL1,
64 reg_mask, reg_val);
65 if (ret) {
66 dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
67 restart ? 0 : 1, ret);
68 return ret;
69 }
70
71 /* Wait for trigger completion */
72 mdelay(200);
73
74 return 0;
75}
76
77static int atc2609a_do_poweroff(const struct atc260x_pwrc *pwrc, bool restart)
78{
79 int ret, deep_sleep = 0;
80 uint reg_mask, reg_val;
81
82 /* S4-Deep Sleep Mode is NOT available for WALL/USB power */
83 if (!restart && !power_supply_is_system_supplied()) {
84 deep_sleep = 1;
85 dev_info(pwrc->dev, "Enabling S4-Deep Sleep Mode");
86 }
87
88 /* Update wakeup sources */
89 reg_val = ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN |
90 (restart ? ATC2609A_PMU_SYS_CTL0_RESET_WK_EN
91 : ATC2609A_PMU_SYS_CTL0_ONOFF_SHORT_WK_EN);
92
93 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
94 ATC2609A_PMU_SYS_CTL0_WK_ALL, reg_val);
95 if (ret)
96 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
97
98 /* Update power mode */
99 reg_mask = ATC2609A_PMU_SYS_CTL3_EN_S2 | ATC2609A_PMU_SYS_CTL3_EN_S3;
100
101 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL3, reg_mask,
102 deep_sleep ? 0 : ATC2609A_PMU_SYS_CTL3_EN_S3);
103 if (ret) {
104 dev_err(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
105 return ret;
106 }
107
108 /* Trigger poweroff / restart sequence */
109 reg_mask = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN
110 : ATC2609A_PMU_SYS_CTL1_EN_S1;
111 reg_val = restart ? ATC2609A_PMU_SYS_CTL0_RESTART_EN : 0;
112
113 ret = regmap_update_bits(pwrc->regmap,
114 restart ? ATC2609A_PMU_SYS_CTL0 : ATC2609A_PMU_SYS_CTL1,
115 reg_mask, reg_val);
116 if (ret) {
117 dev_err(pwrc->dev, "failed to write SYS_CTL%d: %d\n",
118 restart ? 0 : 1, ret);
119 return ret;
120 }
121
122 /* Wait for trigger completion */
123 mdelay(200);
124
125 return 0;
126}
127
128static int atc2603c_init(const struct atc260x_pwrc *pwrc)
129{
130 int ret;
131
132 /*
133 * Delay transition from S2/S3 to S1 in order to avoid
134 * DDR init failure in Bootloader.
135 */
136 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL3,
137 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN,
138 ATC2603C_PMU_SYS_CTL3_S2S3TOS1_TIMER_EN);
139 if (ret)
140 dev_warn(pwrc->dev, "failed to write SYS_CTL3: %d\n", ret);
141
142 /* Set wakeup sources */
143 ret = regmap_update_bits(pwrc->regmap, ATC2603C_PMU_SYS_CTL0,
144 ATC2603C_PMU_SYS_CTL0_WK_ALL,
145 ATC2603C_PMU_SYS_CTL0_HDSW_WK_EN |
146 ATC2603C_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
147 if (ret)
148 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
149
150 return ret;
151}
152
153static int atc2609a_init(const struct atc260x_pwrc *pwrc)
154{
155 int ret;
156
157 /* Set wakeup sources */
158 ret = regmap_update_bits(pwrc->regmap, ATC2609A_PMU_SYS_CTL0,
159 ATC2609A_PMU_SYS_CTL0_WK_ALL,
160 ATC2609A_PMU_SYS_CTL0_HDSW_WK_EN |
161 ATC2609A_PMU_SYS_CTL0_ONOFF_LONG_WK_EN);
162 if (ret)
163 dev_warn(pwrc->dev, "failed to write SYS_CTL0: %d\n", ret);
164
165 return ret;
166}
167
168static void atc260x_pwrc_pm_handler(void)
169{
170 atc260x_pwrc_data->do_poweroff(atc260x_pwrc_data, false);
171
172 WARN_ONCE(1, "Unable to power off system\n");
173}
174
175static int atc260x_pwrc_restart_handler(struct notifier_block *nb,
176 unsigned long mode, void *cmd)
177{
178 struct atc260x_pwrc *pwrc = container_of(nb, struct atc260x_pwrc,
179 restart_nb);
180 pwrc->do_poweroff(pwrc, true);
181
182 return NOTIFY_DONE;
183}
184
185static int atc260x_pwrc_probe(struct platform_device *pdev)
186{
187 struct atc260x *atc260x = dev_get_drvdata(pdev->dev.parent);
188 struct atc260x_pwrc *priv;
189 int ret;
190
191 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
192 if (!priv)
193 return -ENOMEM;
194
195 priv->dev = &pdev->dev;
196 priv->regmap = atc260x->regmap;
197 priv->restart_nb.notifier_call = atc260x_pwrc_restart_handler;
198 priv->restart_nb.priority = 192;
199
200 switch (atc260x->ic_type) {
201 case ATC2603C:
202 priv->do_poweroff = atc2603c_do_poweroff;
203 ret = atc2603c_init(priv);
204 break;
205 case ATC2609A:
206 priv->do_poweroff = atc2609a_do_poweroff;
207 ret = atc2609a_init(priv);
208 break;
209 default:
210 dev_err(priv->dev,
211 "Poweroff not supported for ATC260x PMIC type: %u\n",
212 atc260x->ic_type);
213 return -EINVAL;
214 }
215
216 if (ret)
217 return ret;
218
219 platform_set_drvdata(pdev, priv);
220
221 if (!pm_power_off) {
222 atc260x_pwrc_data = priv;
223 pm_power_off = atc260x_pwrc_pm_handler;
224 } else {
225 dev_warn(priv->dev, "Poweroff callback already assigned\n");
226 }
227
228 ret = register_restart_handler(&priv->restart_nb);
229 if (ret)
230 dev_err(priv->dev, "failed to register restart handler: %d\n",
231 ret);
232
233 return ret;
234}
235
236static int atc260x_pwrc_remove(struct platform_device *pdev)
237{
238 struct atc260x_pwrc *priv = platform_get_drvdata(pdev);
239
240 if (atc260x_pwrc_data == priv) {
241 pm_power_off = NULL;
242 atc260x_pwrc_data = NULL;
243 }
244
245 unregister_restart_handler(&priv->restart_nb);
246
247 return 0;
248}
249
250static struct platform_driver atc260x_pwrc_driver = {
251 .probe = atc260x_pwrc_probe,
252 .remove = atc260x_pwrc_remove,
253 .driver = {
254 .name = "atc260x-pwrc",
255 },
256};
257
258module_platform_driver(atc260x_pwrc_driver);
259
260MODULE_DESCRIPTION("Poweroff & reset driver for ATC260x PMICs");
261MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");
262MODULE_LICENSE("GPL");