1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
|
// 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 int 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);
return 0;
}
static struct platform_driver atc260x_pwrc_driver = {
.probe = atc260x_pwrc_probe,
.remove = 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");
|
