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