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gerrit.cesnet.cz / github / trini / u-boot / 88b326a31e4b7c2b6550980944b9b72f40c1bda0 / . / drivers / power / axp209.c
blob: 9798e5bf7c621ebdba0c27b10f92e43796347609 [file] [log] [blame]
Henrik Nordstrom14bc66b2014-06-13 22:55:50 +0200[diff] [blame]1/*
2 * (C) Copyright 2012
3 * Henrik Nordstrom <henrik@henriknordstrom.net>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <i2c.h>
10#include <axp209.h>
11
12enum axp209_reg {
13 AXP209_POWER_STATUS = 0x00,
14 AXP209_CHIP_VERSION = 0x03,
15 AXP209_DCDC2_VOLTAGE = 0x23,
16 AXP209_DCDC3_VOLTAGE = 0x27,
17 AXP209_LDO24_VOLTAGE = 0x28,
18 AXP209_LDO3_VOLTAGE = 0x29,
19 AXP209_IRQ_STATUS5 = 0x4c,
20 AXP209_SHUTDOWN = 0x32,
21};
22
23#define AXP209_POWER_STATUS_ON_BY_DC (1 << 0)
24
25#define AXP209_IRQ5_PEK_UP (1 << 6)
26#define AXP209_IRQ5_PEK_DOWN (1 << 5)
27
28#define AXP209_POWEROFF (1 << 7)
29
30static int axp209_write(enum axp209_reg reg, u8 val)
31{
32 return i2c_write(0x34, reg, 1, &val, 1);
33}
34
35static int axp209_read(enum axp209_reg reg, u8 *val)
36{
37 return i2c_read(0x34, reg, 1, val, 1);
38}
39
40static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
41{
42 if (mvolt < min)
43 mvolt = min;
44 else if (mvolt > max)
45 mvolt = max;
46
47 return (mvolt - min) / div;
48}
49
50int axp209_set_dcdc2(int mvolt)
51{
52 int rc;
53 u8 cfg, current;
54
55 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
56
57 /* Do we really need to be this gentle? It has built-in voltage slope */
58 while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, &current)) == 0 &&
59 current != cfg) {
60 if (current < cfg)
61 current++;
62 else
63 current--;
64
65 rc = axp209_write(AXP209_DCDC2_VOLTAGE, current);
66 if (rc)
67 break;
68 }
69
70 return rc;
71}
72
73int axp209_set_dcdc3(int mvolt)
74{
75 u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
76
77 return axp209_write(AXP209_DCDC3_VOLTAGE, cfg);
78}
79
80int axp209_set_ldo2(int mvolt)
81{
82 int rc;
83 u8 cfg, reg;
84
85 cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100);
86
87 rc = axp209_read(AXP209_LDO24_VOLTAGE, &reg);
88 if (rc)
89 return rc;
90
91 /* LDO2 configuration is in upper 4 bits */
92 reg = (reg & 0x0f) | (cfg << 4);
93 return axp209_write(AXP209_LDO24_VOLTAGE, reg);
94}
95
96int axp209_set_ldo3(int mvolt)
97{
98 u8 cfg;
99
100 if (mvolt == -1)
101 cfg = 0x80; /* determined by LDO3IN pin */
102 else
103 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
104
105 return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
106}
107
108int axp209_set_ldo4(int mvolt)
109{
110 int rc;
111 static const int vindex[] = {
112 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
113 2700, 2800, 3000, 3100, 3200, 3300
114 };
115 u8 cfg, reg;
116
117 /* Translate mvolt to register cfg value, requested <= selected */
118 for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--);
119
120 rc = axp209_read(AXP209_LDO24_VOLTAGE, &reg);
121 if (rc)
122 return rc;
123
124 /* LDO4 configuration is in lower 4 bits */
125 reg = (reg & 0xf0) | (cfg << 0);
126 return axp209_write(AXP209_LDO24_VOLTAGE, reg);
127}
128
129int axp209_init(void)
130{
131 u8 ver;
132 int rc;
133
134 rc = axp209_read(AXP209_CHIP_VERSION, &ver);
135 if (rc)
136 return rc;
137
138 /* Low 4 bits is chip version */
139 ver &= 0x0f;
140
141 if (ver != 0x1)
142 return -1;
143
144 return 0;
145}
146
147int axp209_poweron_by_dc(void)
148{
149 u8 v;
150
151 if (axp209_read(AXP209_POWER_STATUS, &v))
152 return 0;
153
154 return (v & AXP209_POWER_STATUS_ON_BY_DC);
155}
156
157int axp209_power_button(void)
158{
159 u8 v;
160
161 if (axp209_read(AXP209_IRQ_STATUS5, &v))
162 return 0;
163
164 axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN);
165
166 return v & AXP209_IRQ5_PEK_DOWN;
167}