xref: /openbmc/u-boot/arch/arm/mach-sunxi/pmic_bus.c (revision 523849a0)
1 /*
2  * (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
3  *
4  * Sunxi PMIC bus access helpers
5  *
6  * The axp152 & axp209 use an i2c bus, the axp221 uses the p2wi bus and the
7  * axp223 uses the rsb bus, these functions abstract this.
8  *
9  * SPDX-License-Identifier:	GPL-2.0+
10  */
11 
12 #include <common.h>
13 #include <asm/arch/p2wi.h>
14 #include <asm/arch/rsb.h>
15 #include <i2c.h>
16 #include <asm/arch/pmic_bus.h>
17 
18 #define AXP152_I2C_ADDR			0x30
19 
20 #define AXP209_I2C_ADDR			0x34
21 
22 #define AXP221_CHIP_ADDR		0x68
23 #define AXP221_CTRL_ADDR		0x3e
24 #define AXP221_INIT_DATA		0x3e
25 
26 /* AXP818 device and runtime addresses are same as AXP223 */
27 #define AXP223_DEVICE_ADDR		0x3a3
28 #define AXP223_RUNTIME_ADDR		0x2d
29 
30 int pmic_bus_init(void)
31 {
32 	/* This cannot be 0 because it is used in SPL before BSS is ready */
33 	static int needs_init = 1;
34 	__maybe_unused int ret;
35 
36 	if (!needs_init)
37 		return 0;
38 
39 #if defined CONFIG_AXP221_POWER || defined CONFIG_AXP818_POWER
40 # ifdef CONFIG_MACH_SUN6I
41 	p2wi_init();
42 	ret = p2wi_change_to_p2wi_mode(AXP221_CHIP_ADDR, AXP221_CTRL_ADDR,
43 				       AXP221_INIT_DATA);
44 # else
45 	ret = rsb_init();
46 	if (ret)
47 		return ret;
48 
49 	ret = rsb_set_device_address(AXP223_DEVICE_ADDR, AXP223_RUNTIME_ADDR);
50 # endif
51 	if (ret)
52 		return ret;
53 #endif
54 
55 	needs_init = 0;
56 	return 0;
57 }
58 
59 int pmic_bus_read(u8 reg, u8 *data)
60 {
61 #ifdef CONFIG_AXP152_POWER
62 	return i2c_read(AXP152_I2C_ADDR, reg, 1, data, 1);
63 #elif defined CONFIG_AXP209_POWER
64 	return i2c_read(AXP209_I2C_ADDR, reg, 1, data, 1);
65 #elif defined CONFIG_AXP221_POWER || defined CONFIG_AXP818_POWER
66 # ifdef CONFIG_MACH_SUN6I
67 	return p2wi_read(reg, data);
68 # else
69 	return rsb_read(AXP223_RUNTIME_ADDR, reg, data);
70 # endif
71 #endif
72 }
73 
74 int pmic_bus_write(u8 reg, u8 data)
75 {
76 #ifdef CONFIG_AXP152_POWER
77 	return i2c_write(AXP152_I2C_ADDR, reg, 1, &data, 1);
78 #elif defined CONFIG_AXP209_POWER
79 	return i2c_write(AXP209_I2C_ADDR, reg, 1, &data, 1);
80 #elif defined CONFIG_AXP221_POWER || defined CONFIG_AXP818_POWER
81 # ifdef CONFIG_MACH_SUN6I
82 	return p2wi_write(reg, data);
83 # else
84 	return rsb_write(AXP223_RUNTIME_ADDR, reg, data);
85 # endif
86 #endif
87 }
88 
89 int pmic_bus_setbits(u8 reg, u8 bits)
90 {
91 	int ret;
92 	u8 val;
93 
94 	ret = pmic_bus_read(reg, &val);
95 	if (ret)
96 		return ret;
97 
98 	val |= bits;
99 	return pmic_bus_write(reg, val);
100 }
101 
102 int pmic_bus_clrbits(u8 reg, u8 bits)
103 {
104 	int ret;
105 	u8 val;
106 
107 	ret = pmic_bus_read(reg, &val);
108 	if (ret)
109 		return ret;
110 
111 	val &= ~bits;
112 	return pmic_bus_write(reg, val);
113 }
114