xref: /openbmc/u-boot/drivers/power/axp152.c (revision 54c57ae0)
1 /*
2  * (C) Copyright 2012
3  * Henrik Nordstrom <henrik@henriknordstrom.net>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 #include <common.h>
8 #include <command.h>
9 #include <asm/arch/pmic_bus.h>
10 #include <axp_pmic.h>
11 
12 static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
13 {
14 	if (mvolt < min)
15 		mvolt = min;
16 	else if (mvolt > max)
17 		mvolt = max;
18 
19 	return (mvolt - min) / div;
20 }
21 
22 int axp_set_dcdc2(unsigned int mvolt)
23 {
24 	int rc;
25 	u8 current, target;
26 
27 	target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);
28 
29 	/* Do we really need to be this gentle? It has built-in voltage slope */
30 	while ((rc = pmic_bus_read(AXP152_DCDC2_VOLTAGE, &current)) == 0 &&
31 	       current != target) {
32 		if (current < target)
33 			current++;
34 		else
35 			current--;
36 		rc = pmic_bus_write(AXP152_DCDC2_VOLTAGE, current);
37 		if (rc)
38 			break;
39 	}
40 	return rc;
41 }
42 
43 int axp_set_dcdc3(unsigned int mvolt)
44 {
45 	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 50);
46 
47 	return pmic_bus_write(AXP152_DCDC3_VOLTAGE, target);
48 }
49 
50 int axp_set_dcdc4(unsigned int mvolt)
51 {
52 	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
53 
54 	return pmic_bus_write(AXP152_DCDC4_VOLTAGE, target);
55 }
56 
57 int axp_set_aldo2(unsigned int mvolt)
58 {
59 	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);
60 
61 	return pmic_bus_write(AXP152_LDO2_VOLTAGE, target);
62 }
63 
64 int axp_init(void)
65 {
66 	u8 ver;
67 	int rc;
68 
69 	rc = pmic_bus_init();
70 	if (rc)
71 		return rc;
72 
73 	rc = pmic_bus_read(AXP152_CHIP_VERSION, &ver);
74 	if (rc)
75 		return rc;
76 
77 	if (ver != 0x05)
78 		return -EINVAL;
79 
80 	return 0;
81 }
82 
83 int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
84 {
85 	pmic_bus_write(AXP152_SHUTDOWN, AXP152_POWEROFF);
86 
87 	/* infinite loop during shutdown */
88 	while (1) {}
89 
90 	/* not reached */
91 	return 0;
92 }
93