1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2012
4 * Henrik Nordstrom <henrik@henriknordstrom.net>
5 */
6
7 #include <common.h>
8 #include <command.h>
9 #include <asm/arch/pmic_bus.h>
10 #include <axp_pmic.h>
11 #include <linux/delay.h>
12
13 #ifdef CONFIG_AXP_ALDO3_VOLT_SLOPE_08
14 # define AXP209_VRC_SLOPE AXP209_VRC_LDO3_800uV_uS
15 #endif
16 #ifdef CONFIG_AXP_ALDO3_VOLT_SLOPE_16
17 # define AXP209_VRC_SLOPE AXP209_VRC_LDO3_1600uV_uS
18 #endif
19 #if defined CONFIG_AXP_ALDO3_VOLT_SLOPE_NONE || !defined AXP209_VRC_SLOPE
20 # define AXP209_VRC_SLOPE 0x00
21 #endif
22
axp209_mvolt_to_cfg(int mvolt,int min,int max,int div)23 static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
24 {
25 if (mvolt < min)
26 mvolt = min;
27 else if (mvolt > max)
28 mvolt = max;
29
30 return (mvolt - min) / div;
31 }
32
axp_set_dcdc2(unsigned int mvolt)33 int axp_set_dcdc2(unsigned int mvolt)
34 {
35 int rc;
36 u8 cfg, current;
37
38 if (mvolt == 0)
39 return pmic_bus_clrbits(AXP209_OUTPUT_CTRL,
40 AXP209_OUTPUT_CTRL_DCDC2);
41
42 rc = pmic_bus_setbits(AXP209_OUTPUT_CTRL, AXP209_OUTPUT_CTRL_DCDC2);
43 if (rc)
44 return rc;
45
46 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
47
48 /* Do we really need to be this gentle? It has built-in voltage slope */
49 while ((rc = pmic_bus_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 &&
50 current != cfg) {
51 if (current < cfg)
52 current++;
53 else
54 current--;
55
56 rc = pmic_bus_write(AXP209_DCDC2_VOLTAGE, current);
57 if (rc)
58 break;
59 }
60
61 return rc;
62 }
63
axp_set_dcdc3(unsigned int mvolt)64 int axp_set_dcdc3(unsigned int mvolt)
65 {
66 u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
67 int rc;
68
69 if (mvolt == 0)
70 return pmic_bus_clrbits(AXP209_OUTPUT_CTRL,
71 AXP209_OUTPUT_CTRL_DCDC3);
72
73 rc = pmic_bus_write(AXP209_DCDC3_VOLTAGE, cfg);
74 if (rc)
75 return rc;
76
77 return pmic_bus_setbits(AXP209_OUTPUT_CTRL, AXP209_OUTPUT_CTRL_DCDC3);
78 }
79
axp_set_aldo2(unsigned int mvolt)80 int axp_set_aldo2(unsigned int mvolt)
81 {
82 int rc;
83 u8 cfg, reg;
84
85 if (mvolt == 0)
86 return pmic_bus_clrbits(AXP209_OUTPUT_CTRL,
87 AXP209_OUTPUT_CTRL_LDO2);
88
89 cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100);
90
91 rc = pmic_bus_read(AXP209_LDO24_VOLTAGE, ®);
92 if (rc)
93 return rc;
94
95 reg |= AXP209_LDO24_LDO2_SET(reg, cfg);
96 rc = pmic_bus_write(AXP209_LDO24_VOLTAGE, reg);
97 if (rc)
98 return rc;
99
100 return pmic_bus_setbits(AXP209_OUTPUT_CTRL, AXP209_OUTPUT_CTRL_LDO2);
101 }
102
axp_set_aldo3(unsigned int mvolt)103 int axp_set_aldo3(unsigned int mvolt)
104 {
105 u8 cfg;
106 int rc;
107
108 if (mvolt == 0)
109 return pmic_bus_clrbits(AXP209_OUTPUT_CTRL,
110 AXP209_OUTPUT_CTRL_LDO3);
111
112 /*
113 * Some boards have trouble reaching the target voltage without causing
114 * great inrush currents. To prevent this, boards can enable a certain
115 * slope to ramp up voltage. Note, this only works when changing an
116 * already active power rail. When toggling power on, the AXP ramps up
117 * steeply at 0.0167 V/uS.
118 */
119 rc = pmic_bus_read(AXP209_VRC_DCDC2_LDO3, &cfg);
120 cfg = AXP209_VRC_LDO3_SLOPE_SET(cfg, AXP209_VRC_SLOPE);
121 rc |= pmic_bus_write(AXP209_VRC_DCDC2_LDO3, cfg);
122
123 if (rc)
124 return rc;
125
126 #ifdef CONFIG_AXP_ALDO3_INRUSH_QUIRK
127 /*
128 * On some boards, LDO3 has a too big capacitor installed. When
129 * turning on LDO3, this causes the AXP209 to shutdown on
130 * voltages over 1.9 volt. As a workaround, we enable LDO3
131 * first with the lowest possible voltage. If this still causes
132 * high inrush currents, the voltage slope should be increased.
133 */
134 rc = pmic_bus_read(AXP209_OUTPUT_CTRL, &cfg);
135 if (rc)
136 return rc;
137
138 if (!(cfg & AXP209_OUTPUT_CTRL_LDO3)) {
139 rc = pmic_bus_write(AXP209_LDO3_VOLTAGE, 0x0); /* 0.7 Volt */
140 mdelay(1);
141 rc |= pmic_bus_setbits(AXP209_OUTPUT_CTRL,
142 AXP209_OUTPUT_CTRL_LDO3);
143
144 if (rc)
145 return rc;
146 }
147 #endif
148
149 if (mvolt == -1) {
150 cfg = AXP209_LDO3_VOLTAGE_FROM_LDO3IN;
151 } else {
152 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
153 cfg = AXP209_LDO3_VOLTAGE_SET(cfg);
154 }
155
156 rc = pmic_bus_write(AXP209_LDO3_VOLTAGE, cfg);
157 if (rc)
158 return rc;
159
160 return pmic_bus_setbits(AXP209_OUTPUT_CTRL, AXP209_OUTPUT_CTRL_LDO3);
161 }
162
axp_set_aldo4(unsigned int mvolt)163 int axp_set_aldo4(unsigned int mvolt)
164 {
165 int rc;
166 static const unsigned int vindex[] = {
167 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
168 2700, 2800, 3000, 3100, 3200, 3300
169 };
170 u8 cfg, reg;
171
172 if (mvolt == 0)
173 return pmic_bus_clrbits(AXP209_OUTPUT_CTRL,
174 AXP209_OUTPUT_CTRL_LDO4);
175
176 /* Translate mvolt to register cfg value, requested <= selected */
177 for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--);
178
179 rc = pmic_bus_read(AXP209_LDO24_VOLTAGE, ®);
180 if (rc)
181 return rc;
182
183 reg |= AXP209_LDO24_LDO4_SET(reg, cfg);
184 rc = pmic_bus_write(AXP209_LDO24_VOLTAGE, reg);
185 if (rc)
186 return rc;
187
188 return pmic_bus_setbits(AXP209_OUTPUT_CTRL, AXP209_OUTPUT_CTRL_LDO4);
189 }
190
axp_init(void)191 int axp_init(void)
192 {
193 u8 ver;
194 int i, rc;
195
196 rc = pmic_bus_init();
197 if (rc)
198 return rc;
199
200 rc = pmic_bus_read(AXP209_CHIP_VERSION, &ver);
201 if (rc)
202 return rc;
203
204 if ((ver & AXP209_CHIP_VERSION_MASK) != 0x1)
205 return -EINVAL;
206
207 /* Mask all interrupts */
208 for (i = AXP209_IRQ_ENABLE1; i <= AXP209_IRQ_ENABLE5; i++) {
209 rc = pmic_bus_write(i, 0);
210 if (rc)
211 return rc;
212 }
213
214 /*
215 * Turn off LDOIO regulators / tri-state GPIO pins, when rebooting
216 * from android these are sometimes on.
217 */
218 rc = pmic_bus_write(AXP_GPIO0_CTRL, AXP_GPIO_CTRL_INPUT);
219 if (rc)
220 return rc;
221
222 rc = pmic_bus_write(AXP_GPIO1_CTRL, AXP_GPIO_CTRL_INPUT);
223 if (rc)
224 return rc;
225
226 rc = pmic_bus_write(AXP_GPIO2_CTRL, AXP_GPIO_CTRL_INPUT);
227 if (rc)
228 return rc;
229
230 return 0;
231 }
232
do_poweroff(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])233 int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
234 {
235 pmic_bus_write(AXP209_SHUTDOWN, AXP209_POWEROFF);
236
237 /* infinite loop during shutdown */
238 while (1) {}
239
240 /* not reached */
241 return 0;
242 }
243