1*4394ad12SHou Zhiqiang /*
2*4394ad12SHou Zhiqiang * Copyright 2016 Freescale Semiconductor, Inc.
3*4394ad12SHou Zhiqiang * Hou Zhiqiang <Zhiqiang.Hou@freescale.com>
4*4394ad12SHou Zhiqiang *
5*4394ad12SHou Zhiqiang * SPDX-License-Identifier: GPL-2.0+
6*4394ad12SHou Zhiqiang */
7*4394ad12SHou Zhiqiang
8*4394ad12SHou Zhiqiang #include <common.h>
9*4394ad12SHou Zhiqiang #include <errno.h>
10*4394ad12SHou Zhiqiang #include <i2c.h>
11*4394ad12SHou Zhiqiang #include <power/pmic.h>
12*4394ad12SHou Zhiqiang #include <power/mc34vr500_pmic.h>
13*4394ad12SHou Zhiqiang
14*4394ad12SHou Zhiqiang static uint8_t swxvolt_addr[4] = { MC34VR500_SW1VOLT,
15*4394ad12SHou Zhiqiang MC34VR500_SW2VOLT,
16*4394ad12SHou Zhiqiang MC34VR500_SW3VOLT,
17*4394ad12SHou Zhiqiang MC34VR500_SW4VOLT };
18*4394ad12SHou Zhiqiang
19*4394ad12SHou Zhiqiang static uint8_t swx_set_point_base[4] = { 13, 9, 9, 9 };
20*4394ad12SHou Zhiqiang
mc34vr500_get_sw_volt(uint8_t sw)21*4394ad12SHou Zhiqiang int mc34vr500_get_sw_volt(uint8_t sw)
22*4394ad12SHou Zhiqiang {
23*4394ad12SHou Zhiqiang struct pmic *p;
24*4394ad12SHou Zhiqiang u32 swxvolt;
25*4394ad12SHou Zhiqiang uint8_t spb;
26*4394ad12SHou Zhiqiang int sw_volt;
27*4394ad12SHou Zhiqiang int ret;
28*4394ad12SHou Zhiqiang
29*4394ad12SHou Zhiqiang debug("%s: Get SW%u volt from swxvolt_addr = 0x%x\n",
30*4394ad12SHou Zhiqiang __func__, sw + 1, swxvolt_addr[sw]);
31*4394ad12SHou Zhiqiang if (sw > SW4) {
32*4394ad12SHou Zhiqiang printf("%s: Unsupported SW(sw%d)\n", __func__, sw + 1);
33*4394ad12SHou Zhiqiang return -EINVAL;
34*4394ad12SHou Zhiqiang }
35*4394ad12SHou Zhiqiang
36*4394ad12SHou Zhiqiang p = pmic_get("MC34VR500");
37*4394ad12SHou Zhiqiang if (!p) {
38*4394ad12SHou Zhiqiang printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
39*4394ad12SHou Zhiqiang return -ENODEV;
40*4394ad12SHou Zhiqiang }
41*4394ad12SHou Zhiqiang
42*4394ad12SHou Zhiqiang ret = pmic_probe(p);
43*4394ad12SHou Zhiqiang if (ret)
44*4394ad12SHou Zhiqiang return ret;
45*4394ad12SHou Zhiqiang
46*4394ad12SHou Zhiqiang ret = pmic_reg_read(p, swxvolt_addr[sw], &swxvolt);
47*4394ad12SHou Zhiqiang if (ret) {
48*4394ad12SHou Zhiqiang printf("%s: Failed to get SW%u volt\n", __func__, sw + 1);
49*4394ad12SHou Zhiqiang return ret;
50*4394ad12SHou Zhiqiang }
51*4394ad12SHou Zhiqiang
52*4394ad12SHou Zhiqiang debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
53*4394ad12SHou Zhiqiang spb = swx_set_point_base[sw];
54*4394ad12SHou Zhiqiang /* The base of SW volt is 625mV and increase by step 25mV */
55*4394ad12SHou Zhiqiang sw_volt = 625 + (swxvolt - spb) * 25;
56*4394ad12SHou Zhiqiang
57*4394ad12SHou Zhiqiang debug("%s: SW%u volt = %dmV\n", __func__, sw + 1, sw_volt);
58*4394ad12SHou Zhiqiang return sw_volt;
59*4394ad12SHou Zhiqiang }
60*4394ad12SHou Zhiqiang
mc34vr500_set_sw_volt(uint8_t sw,int sw_volt)61*4394ad12SHou Zhiqiang int mc34vr500_set_sw_volt(uint8_t sw, int sw_volt)
62*4394ad12SHou Zhiqiang {
63*4394ad12SHou Zhiqiang struct pmic *p;
64*4394ad12SHou Zhiqiang u32 swxvolt;
65*4394ad12SHou Zhiqiang uint8_t spb;
66*4394ad12SHou Zhiqiang int ret;
67*4394ad12SHou Zhiqiang
68*4394ad12SHou Zhiqiang debug("%s: Set SW%u volt to %dmV\n", __func__, sw + 1, sw_volt);
69*4394ad12SHou Zhiqiang /* The least SW volt is 625mV, and only 4 SW outputs */
70*4394ad12SHou Zhiqiang if (sw > SW4 || sw_volt < 625)
71*4394ad12SHou Zhiqiang return -EINVAL;
72*4394ad12SHou Zhiqiang
73*4394ad12SHou Zhiqiang p = pmic_get("MC34VR500");
74*4394ad12SHou Zhiqiang if (!p) {
75*4394ad12SHou Zhiqiang printf("%s: Did NOT find PMIC MC34VR500\n", __func__);
76*4394ad12SHou Zhiqiang return -ENODEV;
77*4394ad12SHou Zhiqiang }
78*4394ad12SHou Zhiqiang
79*4394ad12SHou Zhiqiang ret = pmic_probe(p);
80*4394ad12SHou Zhiqiang if (ret)
81*4394ad12SHou Zhiqiang return ret;
82*4394ad12SHou Zhiqiang
83*4394ad12SHou Zhiqiang spb = swx_set_point_base[sw];
84*4394ad12SHou Zhiqiang /* The base of SW volt is 625mV and increase by step 25mV */
85*4394ad12SHou Zhiqiang swxvolt = (sw_volt - 625) / 25 + spb;
86*4394ad12SHou Zhiqiang debug("%s: SW%d step point swxvolt = %u\n", __func__, sw + 1, swxvolt);
87*4394ad12SHou Zhiqiang if (swxvolt > 63)
88*4394ad12SHou Zhiqiang return -EINVAL;
89*4394ad12SHou Zhiqiang
90*4394ad12SHou Zhiqiang ret = pmic_reg_write(p, swxvolt_addr[sw], swxvolt);
91*4394ad12SHou Zhiqiang if (ret)
92*4394ad12SHou Zhiqiang return ret;
93*4394ad12SHou Zhiqiang
94*4394ad12SHou Zhiqiang return 0;
95*4394ad12SHou Zhiqiang }
96