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