1 /*
2  * (C) Copyright 2011-2013
3  * Texas Instruments, <www.ti.com>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <common.h>
9 #include <i2c.h>
10 #include <asm/errno.h>
11 #include <power/pmic.h>
12 #include <power/tps65218.h>
13 
14 /**
15  *  tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
16  *			   register or bit field regardless of protection
17  *			   level.
18  *
19  *  @prot_level:	   Register password protection.  Use
20  *			   TPS65218_PROT_LEVEL_NONE,
21  *			   TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2
22  *  @dest_reg:		   Register address to write.
23  *  @dest_val:		   Value to write.
24  *  @mask:		   Bit mask (8 bits) to be applied.  Function will only
25  *			   change bits that are set in the bit mask.
26  *
27  *  @return:		   0 for success, not 0 on failure, as per the i2c API
28  */
29 int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
30 		       uchar mask)
31 {
32 	uchar read_val;
33 	uchar xor_reg;
34 	int ret;
35 
36 	/*
37 	 * If we are affecting only a bit field, read dest_reg and apply the
38 	 * mask
39 	 */
40 	if (mask != TPS65218_MASK_ALL_BITS) {
41 		ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
42 		if (ret)
43 			return ret;
44 		read_val &= (~mask);
45 		read_val |= (dest_val & mask);
46 		dest_val = read_val;
47 	}
48 
49 	if (prot_level > 0) {
50 		xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
51 		ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
52 				&xor_reg, 1);
53 		if (ret)
54 			return ret;
55 	}
56 
57 	ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
58 	if (ret)
59 		return ret;
60 
61 	if (prot_level == TPS65218_PROT_LEVEL_2) {
62 		ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
63 				&xor_reg, 1);
64 		if (ret)
65 			return ret;
66 
67 		ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
68 		if (ret)
69 			return ret;
70 	}
71 
72 	return 0;
73 }
74 
75 /**
76  * tps65218_voltage_update() - Function to change a voltage level, as this
77  *			       is a multi-step process.
78  * @dc_cntrl_reg:	       DC voltage control register to change.
79  * @volt_sel:		       New value for the voltage register
80  * @return:		       0 for success, not 0 on failure.
81  */
82 int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
83 {
84 	if ((dc_cntrl_reg != TPS65218_DCDC1) &&
85 	    (dc_cntrl_reg != TPS65218_DCDC2))
86 		return 1;
87 
88 	/* set voltage level */
89 	if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
90 			       TPS65218_MASK_ALL_BITS))
91 		return 1;
92 
93 	/* set GO bit to initiate voltage transition */
94 	if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
95 			       TPS65218_DCDC_GO, TPS65218_DCDC_GO))
96 		return 1;
97 
98 	return 0;
99 }
100 
101 int power_tps65218_init(unsigned char bus)
102 {
103 	static const char name[] = "TPS65218_PMIC";
104 	struct pmic *p = pmic_alloc();
105 
106 	if (!p) {
107 		printf("%s: POWER allocation error!\n", __func__);
108 		return -ENOMEM;
109 	}
110 
111 	p->name = name;
112 	p->interface = PMIC_I2C;
113 	p->number_of_regs = TPS65218_PMIC_NUM_OF_REGS;
114 	p->hw.i2c.addr = TPS65218_CHIP_PM;
115 	p->hw.i2c.tx_num = 1;
116 	p->bus = bus;
117 
118 	return 0;
119 }
120