1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * AXP305 driver
4 *
5 * (C) Copyright 2020 Jernej Skrabec <jernej.skrabec@siol.net>
6 *
7 * Based on axp221.c
8 * (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com>
9 * (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl>
10 */
11
12 #include <common.h>
13 #include <command.h>
14 #include <errno.h>
15 #include <asm/arch/pmic_bus.h>
16 #include <axp_pmic.h>
17
18 #define AXP305_DCDC4_1600MV_OFFSET 46
19
axp305_mvolt_to_cfg(int mvolt,int min,int max,int div)20 static u8 axp305_mvolt_to_cfg(int mvolt, int min, int max, int div)
21 {
22 if (mvolt < min)
23 mvolt = min;
24 else if (mvolt > max)
25 mvolt = max;
26
27 return (mvolt - min) / div;
28 }
29
axp_set_dcdc4(unsigned int mvolt)30 int axp_set_dcdc4(unsigned int mvolt)
31 {
32 int ret;
33 u8 cfg;
34
35 if (mvolt >= 1600)
36 cfg = AXP305_DCDC4_1600MV_OFFSET +
37 axp305_mvolt_to_cfg(mvolt, 1600, 3300, 100);
38 else
39 cfg = axp305_mvolt_to_cfg(mvolt, 600, 1500, 20);
40
41 if (mvolt == 0)
42 return pmic_bus_clrbits(AXP305_OUTPUT_CTRL1,
43 AXP305_OUTPUT_CTRL1_DCDCD_EN);
44
45 ret = pmic_bus_write(AXP305_DCDCD_VOLTAGE, cfg);
46 if (ret)
47 return ret;
48
49 return pmic_bus_setbits(AXP305_OUTPUT_CTRL1,
50 AXP305_OUTPUT_CTRL1_DCDCD_EN);
51 }
52
axp_init(void)53 int axp_init(void)
54 {
55 u8 axp_chip_id;
56 int ret;
57
58 ret = pmic_bus_init();
59 if (ret)
60 return ret;
61
62 ret = pmic_bus_read(AXP305_CHIP_VERSION, &axp_chip_id);
63 if (ret)
64 return ret;
65
66 if ((axp_chip_id & AXP305_CHIP_VERSION_MASK) != 0x40)
67 return -ENODEV;
68
69 return ret;
70 }
71
72 #ifndef CONFIG_PSCI_RESET
do_poweroff(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])73 int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
74 {
75 pmic_bus_write(AXP305_SHUTDOWN, AXP305_POWEROFF);
76
77 /* infinite loop during shutdown */
78 while (1) {}
79
80 /* not reached */
81 return 0;
82 }
83 #endif
84