1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright 2016 Freescale Semiconductor, Inc.
3*4882a593Smuzhiyun * Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <errno.h>
10*4882a593Smuzhiyun #include <i2c.h>
11*4882a593Smuzhiyun #include <power/pmic.h>
12*4882a593Smuzhiyun #include <power/mc34vr500_pmic.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun static uint8_t swxvolt_addr[4] = { MC34VR500_SW1VOLT,
15*4882a593Smuzhiyun MC34VR500_SW2VOLT,
16*4882a593Smuzhiyun MC34VR500_SW3VOLT,
17*4882a593Smuzhiyun MC34VR500_SW4VOLT };
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static uint8_t swx_set_point_base[4] = { 13, 9, 9, 9 };
20*4882a593Smuzhiyun
mc34vr500_get_sw_volt(uint8_t sw)21*4882a593Smuzhiyun int mc34vr500_get_sw_volt(uint8_t sw)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun struct pmic *p;
24*4882a593Smuzhiyun u32 swxvolt;
25*4882a593Smuzhiyun uint8_t spb;
26*4882a593Smuzhiyun int sw_volt;
27*4882a593Smuzhiyun int ret;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun debug("%s: Get SW%u volt from swxvolt_addr = 0x%x\n",
30*4882a593Smuzhiyun __func__, sw + 1, swxvolt_addr[sw]);
31*4882a593Smuzhiyun if (sw > SW4) {
32*4882a593Smuzhiyun printf("%s: Unsupported SW(sw%d)\n", __func__, sw + 1);
33*4882a593Smuzhiyun return -EINVAL;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun p = pmic_get("MC34VR500");
37*4882a593Smuzhiyun if (!p) {
38*4882a593Smuzhiyun printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
39*4882a593Smuzhiyun return -ENODEV;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun ret = pmic_probe(p);
43*4882a593Smuzhiyun if (ret)
44*4882a593Smuzhiyun return ret;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun ret = pmic_reg_read(p, swxvolt_addr[sw], &swxvolt);
47*4882a593Smuzhiyun if (ret) {
48*4882a593Smuzhiyun printf("%s: Failed to get SW%u volt\n", __func__, sw + 1);
49*4882a593Smuzhiyun return ret;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
53*4882a593Smuzhiyun spb = swx_set_point_base[sw];
54*4882a593Smuzhiyun /* The base of SW volt is 625mV and increase by step 25mV */
55*4882a593Smuzhiyun sw_volt = 625 + (swxvolt - spb) * 25;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun debug("%s: SW%u volt = %dmV\n", __func__, sw + 1, sw_volt);
58*4882a593Smuzhiyun return sw_volt;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
mc34vr500_set_sw_volt(uint8_t sw,int sw_volt)61*4882a593Smuzhiyun int mc34vr500_set_sw_volt(uint8_t sw, int sw_volt)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun struct pmic *p;
64*4882a593Smuzhiyun u32 swxvolt;
65*4882a593Smuzhiyun uint8_t spb;
66*4882a593Smuzhiyun int ret;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun debug("%s: Set SW%u volt to %dmV\n", __func__, sw + 1, sw_volt);
69*4882a593Smuzhiyun /* The least SW volt is 625mV, and only 4 SW outputs */
70*4882a593Smuzhiyun if (sw > SW4 || sw_volt < 625)
71*4882a593Smuzhiyun return -EINVAL;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun p = pmic_get("MC34VR500");
74*4882a593Smuzhiyun if (!p) {
75*4882a593Smuzhiyun printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
76*4882a593Smuzhiyun return -ENODEV;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun ret = pmic_probe(p);
80*4882a593Smuzhiyun if (ret)
81*4882a593Smuzhiyun return ret;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun spb = swx_set_point_base[sw];
84*4882a593Smuzhiyun /* The base of SW volt is 625mV and increase by step 25mV */
85*4882a593Smuzhiyun swxvolt = (sw_volt - 625) / 25 + spb;
86*4882a593Smuzhiyun debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
87*4882a593Smuzhiyun if (swxvolt > 63)
88*4882a593Smuzhiyun return -EINVAL;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun ret = pmic_reg_write(p, swxvolt_addr[sw], swxvolt);
91*4882a593Smuzhiyun if (ret)
92*4882a593Smuzhiyun return ret;
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun return 0;
95*4882a593Smuzhiyun }
96