1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2015 Google, Inc
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <errno.h>
9 #include <power/pmic.h>
10 #include <power/regulator.h>
11 #include <power/tps65090.h>
12
tps65090_fet_probe(struct udevice * dev)13 static int tps65090_fet_probe(struct udevice *dev)
14 {
15 struct dm_regulator_uclass_platdata *uc_pdata;
16
17 uc_pdata = dev_get_uclass_platdata(dev);
18
19 uc_pdata->type = REGULATOR_TYPE_OTHER;
20 uc_pdata->mode_count = 0;
21
22 return 0;
23 }
24
tps65090_fet_get_enable(struct udevice * dev)25 static int tps65090_fet_get_enable(struct udevice *dev)
26 {
27 struct udevice *pmic = dev_get_parent(dev);
28 int ret, fet_id;
29
30 fet_id = dev->driver_data;
31 debug("%s: fet_id=%d\n", __func__, fet_id);
32
33 ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
34 if (ret < 0)
35 return ret;
36
37 return ret & FET_CTRL_ENFET;
38 }
39
40 /**
41 * Set the power state for a FET
42 *
43 * @param pmic pmic structure for the tps65090
44 * @param fet_id FET number to set (1..MAX_FET_NUM)
45 * @param set 1 to power on FET, 0 to power off
46 * @return -EIO if we got a comms error, -EAGAIN if the FET failed to
47 * change state. If all is ok, returns 0.
48 */
tps65090_fet_set(struct udevice * pmic,int fet_id,bool set)49 static int tps65090_fet_set(struct udevice *pmic, int fet_id, bool set)
50 {
51 int retry;
52 u32 value;
53 int ret;
54
55 value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
56 if (set)
57 value |= FET_CTRL_ENFET;
58
59 if (pmic_reg_write(pmic, REG_FET_BASE + fet_id, value))
60 return -EIO;
61
62 /* Try reading until we get a result */
63 for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
64 ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
65 if (ret < 0)
66 return ret;
67
68 /* Check that the FET went into the expected state */
69 debug("%s: flags=%x\n", __func__, ret);
70 if (!!(ret & FET_CTRL_PGFET) == set)
71 return 0;
72
73 /* If we got a timeout, there is no point in waiting longer */
74 if (ret & FET_CTRL_TOFET)
75 break;
76
77 mdelay(1);
78 }
79
80 debug("FET %d: Power good should have set to %d but reg=%#02x\n",
81 fet_id, set, ret);
82 return -EAGAIN;
83 }
84
tps65090_fet_set_enable(struct udevice * dev,bool enable)85 static int tps65090_fet_set_enable(struct udevice *dev, bool enable)
86 {
87 struct udevice *pmic = dev_get_parent(dev);
88 int ret, fet_id;
89 ulong start;
90 int loops;
91
92 fet_id = dev->driver_data;
93 debug("%s: fet_id=%d, enable=%d\n", __func__, fet_id, enable);
94
95 start = get_timer(0);
96 for (loops = 0;; loops++) {
97 ret = tps65090_fet_set(pmic, fet_id, enable);
98 if (!ret)
99 break;
100
101 if (get_timer(start) > 100)
102 break;
103
104 /* Turn it off and try again until we time out */
105 tps65090_fet_set(pmic, fet_id, false);
106 }
107
108 if (ret)
109 debug("%s: FET%d failed to power on: time=%lums, loops=%d\n",
110 __func__, fet_id, get_timer(start), loops);
111 else if (loops)
112 debug("%s: FET%d powered on after %lums, loops=%d\n",
113 __func__, fet_id, get_timer(start), loops);
114
115 /*
116 * Unfortunately there are some conditions where the power-good bit
117 * will be 0, but the FET still comes up. One such case occurs with
118 * the LCD backlight on snow. We'll just return 0 here and assume
119 * that the FET will eventually come up.
120 */
121 if (ret == -EAGAIN)
122 ret = 0;
123
124 return ret;
125 }
126
127 static const struct dm_regulator_ops tps65090_fet_ops = {
128 .get_enable = tps65090_fet_get_enable,
129 .set_enable = tps65090_fet_set_enable,
130 };
131
132 U_BOOT_DRIVER(tps65090_fet) = {
133 .name = TPS65090_FET_DRIVER,
134 .id = UCLASS_REGULATOR,
135 .ops = &tps65090_fet_ops,
136 .probe = tps65090_fet_probe,
137 };
138