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Henrik Nordstrom14bc66b2014-06-13 22:55:50 +02001/*
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,
Hans de Goede9dcf68f2015-01-17 16:39:20 +010019 AXP209_IRQ_ENABLE1 = 0x40,
20 AXP209_IRQ_ENABLE2 = 0x41,
21 AXP209_IRQ_ENABLE3 = 0x42,
22 AXP209_IRQ_ENABLE4 = 0x43,
23 AXP209_IRQ_ENABLE5 = 0x44,
Henrik Nordstrom14bc66b2014-06-13 22:55:50 +020024 AXP209_IRQ_STATUS5 = 0x4c,
25 AXP209_SHUTDOWN = 0x32,
Hans de Goede6c727e02014-12-24 19:34:38 +010026 AXP209_GPIO0_CTRL = 0x90,
27 AXP209_GPIO1_CTRL = 0x92,
28 AXP209_GPIO2_CTRL = 0x93,
29 AXP209_GPIO_STATE = 0x94,
30 AXP209_GPIO3_CTRL = 0x95,
Henrik Nordstrom14bc66b2014-06-13 22:55:50 +020031};
32
33#define AXP209_POWER_STATUS_ON_BY_DC (1 << 0)
34
35#define AXP209_IRQ5_PEK_UP (1 << 6)
36#define AXP209_IRQ5_PEK_DOWN (1 << 5)
37
38#define AXP209_POWEROFF (1 << 7)
39
Hans de Goede6c727e02014-12-24 19:34:38 +010040#define AXP209_GPIO_OUTPUT_LOW 0x00 /* Drive pin low */
41#define AXP209_GPIO_OUTPUT_HIGH 0x01 /* Drive pin high */
42#define AXP209_GPIO_INPUT 0x02 /* Float pin */
43
44/* GPIO3 is different from the others */
45#define AXP209_GPIO3_OUTPUT_LOW 0x00 /* Drive pin low, Output mode */
46#define AXP209_GPIO3_OUTPUT_HIGH 0x02 /* Float pin, Output mode */
47#define AXP209_GPIO3_INPUT 0x06 /* Float pin, Input mode */
48
Henrik Nordstrom14bc66b2014-06-13 22:55:50 +020049static int axp209_write(enum axp209_reg reg, u8 val)
50{
51 return i2c_write(0x34, reg, 1, &val, 1);
52}
53
54static int axp209_read(enum axp209_reg reg, u8 *val)
55{
56 return i2c_read(0x34, reg, 1, val, 1);
57}
58
59static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
60{
61 if (mvolt < min)
62 mvolt = min;
63 else if (mvolt > max)
64 mvolt = max;
65
66 return (mvolt - min) / div;
67}
68
69int axp209_set_dcdc2(int mvolt)
70{
71 int rc;
72 u8 cfg, current;
73
74 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
75
76 /* Do we really need to be this gentle? It has built-in voltage slope */
77 while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, &current)) == 0 &&
78 current != cfg) {
79 if (current < cfg)
80 current++;
81 else
82 current--;
83
84 rc = axp209_write(AXP209_DCDC2_VOLTAGE, current);
85 if (rc)
86 break;
87 }
88
89 return rc;
90}
91
92int axp209_set_dcdc3(int mvolt)
93{
94 u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
95
96 return axp209_write(AXP209_DCDC3_VOLTAGE, cfg);
97}
98
99int axp209_set_ldo2(int mvolt)
100{
101 int rc;
102 u8 cfg, reg;
103
104 cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100);
105
106 rc = axp209_read(AXP209_LDO24_VOLTAGE, &reg);
107 if (rc)
108 return rc;
109
110 /* LDO2 configuration is in upper 4 bits */
111 reg = (reg & 0x0f) | (cfg << 4);
112 return axp209_write(AXP209_LDO24_VOLTAGE, reg);
113}
114
115int axp209_set_ldo3(int mvolt)
116{
117 u8 cfg;
118
119 if (mvolt == -1)
120 cfg = 0x80; /* determined by LDO3IN pin */
121 else
122 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
123
124 return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
125}
126
127int axp209_set_ldo4(int mvolt)
128{
129 int rc;
130 static const int vindex[] = {
131 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
132 2700, 2800, 3000, 3100, 3200, 3300
133 };
134 u8 cfg, reg;
135
136 /* Translate mvolt to register cfg value, requested <= selected */
137 for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--);
138
139 rc = axp209_read(AXP209_LDO24_VOLTAGE, &reg);
140 if (rc)
141 return rc;
142
143 /* LDO4 configuration is in lower 4 bits */
144 reg = (reg & 0xf0) | (cfg << 0);
145 return axp209_write(AXP209_LDO24_VOLTAGE, reg);
146}
147
148int axp209_init(void)
149{
150 u8 ver;
Hans de Goede9dcf68f2015-01-17 16:39:20 +0100151 int i, rc;
Henrik Nordstrom14bc66b2014-06-13 22:55:50 +0200152
153 rc = axp209_read(AXP209_CHIP_VERSION, &ver);
154 if (rc)
155 return rc;
156
157 /* Low 4 bits is chip version */
158 ver &= 0x0f;
159
160 if (ver != 0x1)
161 return -1;
162
Hans de Goede9dcf68f2015-01-17 16:39:20 +0100163 /* Mask all interrupts */
164 for (i = AXP209_IRQ_ENABLE1; i <= AXP209_IRQ_ENABLE5; i++) {
165 rc = axp209_write(i, 0);
166 if (rc)
167 return rc;
168 }
169
Henrik Nordstrom14bc66b2014-06-13 22:55:50 +0200170 return 0;
171}
172
173int axp209_poweron_by_dc(void)
174{
175 u8 v;
176
177 if (axp209_read(AXP209_POWER_STATUS, &v))
178 return 0;
179
180 return (v & AXP209_POWER_STATUS_ON_BY_DC);
181}
182
183int axp209_power_button(void)
184{
185 u8 v;
186
187 if (axp209_read(AXP209_IRQ_STATUS5, &v))
188 return 0;
189
190 axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN);
191
192 return v & AXP209_IRQ5_PEK_DOWN;
193}
Hans de Goede6c727e02014-12-24 19:34:38 +0100194
195static u8 axp209_get_gpio_ctrl_reg(unsigned int pin)
196{
197 switch (pin) {
198 case 0: return AXP209_GPIO0_CTRL;
199 case 1: return AXP209_GPIO1_CTRL;
200 case 2: return AXP209_GPIO2_CTRL;
201 case 3: return AXP209_GPIO3_CTRL;
202 }
203 return 0;
204}
205
206int axp_gpio_direction_input(unsigned int pin)
207{
208 u8 reg = axp209_get_gpio_ctrl_reg(pin);
209 /* GPIO3 is "special" */
210 u8 val = (pin == 3) ? AXP209_GPIO3_INPUT : AXP209_GPIO_INPUT;
211
212 return axp209_write(reg, val);
213}
214
215int axp_gpio_direction_output(unsigned int pin, unsigned int val)
216{
217 u8 reg = axp209_get_gpio_ctrl_reg(pin);
218
219 if (val) {
220 val = (pin == 3) ? AXP209_GPIO3_OUTPUT_HIGH :
221 AXP209_GPIO_OUTPUT_HIGH;
222 } else {
223 val = (pin == 3) ? AXP209_GPIO3_OUTPUT_LOW :
224 AXP209_GPIO_OUTPUT_LOW;
225 }
226
227 return axp209_write(reg, val);
228}
229
230int axp_gpio_get_value(unsigned int pin)
231{
232 u8 val, mask;
233 int rc;
234
235 if (pin == 3) {
236 rc = axp209_read(AXP209_GPIO3_CTRL, &val);
237 mask = 1;
238 } else {
239 rc = axp209_read(AXP209_GPIO_STATE, &val);
240 mask = 1 << (pin + 4);
241 }
242 if (rc)
243 return rc;
244
245 return (val & mask) ? 1 : 0;
246}
247
248int axp_gpio_set_value(unsigned int pin, unsigned int val)
249{
250 return axp_gpio_direction_output(pin, val);
251}