| Hou Zhiqiang | 4394ad1 | 2016-12-09 16:08:58 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 Freescale Semiconductor, Inc. |
| 3 | * Hou Zhiqiang <Zhiqiang.Hou@freescale.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <errno.h> |
| 10 | #include <i2c.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 | |
| 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 | |
| 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 | } |