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
|
/*
* Copyright (c) 2015 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <power/pmic.h>
#include <power/regulator.h>
#include <power/tps65090.h>
static int tps65090_fet_probe(struct udevice *dev)
{
struct dm_regulator_uclass_platdata *uc_pdata;
uc_pdata = dev_get_uclass_platdata(dev);
uc_pdata->type = REGULATOR_TYPE_OTHER;
uc_pdata->mode_count = 0;
return 0;
}
static bool tps65090_fet_get_enable(struct udevice *dev)
{
struct udevice *pmic = dev_get_parent(dev);
int ret, fet_id;
fet_id = dev->driver_data;
debug("%s: fet_id=%d\n", __func__, fet_id);
ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
if (ret < 0)
return ret;
return ret & FET_CTRL_ENFET;
}
/**
* Set the power state for a FET
*
* @param pmic pmic structure for the tps65090
* @param fet_id FET number to set (1..MAX_FET_NUM)
* @param set 1 to power on FET, 0 to power off
* @return -EIO if we got a comms error, -EAGAIN if the FET failed to
* change state. If all is ok, returns 0.
*/
static int tps65090_fet_set(struct udevice *pmic, int fet_id, bool set)
{
int retry;
u32 value;
int ret;
value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
if (set)
value |= FET_CTRL_ENFET;
if (pmic_reg_write(pmic, REG_FET_BASE + fet_id, value))
return -EIO;
/* Try reading until we get a result */
for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
if (ret < 0)
return ret;
/* Check that the FET went into the expected state */
debug("%s: flags=%x\n", __func__, ret);
if (!!(ret & FET_CTRL_PGFET) == set)
return 0;
/* If we got a timeout, there is no point in waiting longer */
if (ret & FET_CTRL_TOFET)
break;
mdelay(1);
}
debug("FET %d: Power good should have set to %d but reg=%#02x\n",
fet_id, set, ret);
return -EAGAIN;
}
static int tps65090_fet_set_enable(struct udevice *dev, bool enable)
{
struct udevice *pmic = dev_get_parent(dev);
int ret, fet_id;
ulong start;
int loops;
fet_id = dev->driver_data;
debug("%s: fet_id=%d, enable=%d\n", __func__, fet_id, enable);
start = get_timer(0);
for (loops = 0;; loops++) {
ret = tps65090_fet_set(pmic, fet_id, enable);
if (!ret)
break;
if (get_timer(start) > 100)
break;
/* Turn it off and try again until we time out */
tps65090_fet_set(pmic, fet_id, false);
}
if (ret)
debug("%s: FET%d failed to power on: time=%lums, loops=%d\n",
__func__, fet_id, get_timer(start), loops);
else if (loops)
debug("%s: FET%d powered on after %lums, loops=%d\n",
__func__, fet_id, get_timer(start), loops);
/*
* Unfortunately there are some conditions where the power-good bit
* will be 0, but the FET still comes up. One such case occurs with
* the LCD backlight on snow. We'll just return 0 here and assume
* that the FET will eventually come up.
*/
if (ret == -EAGAIN)
ret = 0;
return ret;
}
static const struct dm_regulator_ops tps65090_fet_ops = {
.get_enable = tps65090_fet_get_enable,
.set_enable = tps65090_fet_set_enable,
};
U_BOOT_DRIVER(tps65090_fet) = {
.name = TPS65090_FET_DRIVER,
.id = UCLASS_REGULATOR,
.ops = &tps65090_fet_ops,
.probe = tps65090_fet_probe,
};
|
