| Andre Przywara | 107d1ae | 2023-07-30 01:11:01 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* |
| 3 | * AXP313(a) driver |
| 4 | * |
| 5 | * (C) Copyright 2023 Arm Ltd. |
| 6 | * |
| 7 | * Based on axp305.c |
| 8 | * (C) Copyright 2020 Jernej Skrabec <jernej.skrabec@siol.net> |
| 9 | * (C) Copyright 2014 Hans de Goede <hdegoede@redhat.com> |
| 10 | * (C) Copyright 2013 Oliver Schinagl <oliver@schinagl.nl> |
| 11 | */ |
| 12 | |
| 13 | #include <common.h> |
| 14 | #include <command.h> |
| 15 | #include <errno.h> |
| 16 | #include <asm/arch/pmic_bus.h> |
| 17 | #include <axp_pmic.h> |
| 18 | |
| 19 | enum axp313_reg { |
| 20 | AXP313_CHIP_VERSION = 0x03, |
| 21 | AXP313_OUTPUT_CTRL = 0x10, |
| 22 | AXP313_DCDC1_CTRL = 0x13, |
| 23 | AXP313_SHUTDOWN = 0x1a, |
| 24 | }; |
| 25 | |
| 26 | #define AXP313_CHIP_VERSION_MASK 0xcf |
| 27 | #define AXP313_CHIP_VERSION_AXP1530 0x48 |
| 28 | #define AXP313_CHIP_VERSION_AXP313A 0x4b |
| 29 | #define AXP313_CHIP_VERSION_AXP313B 0x4c |
| 30 | |
| 31 | #define AXP313_DCDC_SPLIT_OFFSET 71 |
| 32 | #define AXP313_DCDC_SPLIT_MVOLT 1200 |
| 33 | |
| 34 | #define AXP313_POWEROFF BIT(7) |
| 35 | |
| 36 | static u8 mvolt_to_cfg(int mvolt, int min, int max, int div) |
| 37 | { |
| 38 | if (mvolt < min) |
| 39 | mvolt = min; |
| 40 | else if (mvolt > max) |
| 41 | mvolt = max; |
| 42 | |
| 43 | return (mvolt - min) / div; |
| 44 | } |
| 45 | |
| 46 | static int axp_set_dcdc(int dcdc_num, unsigned int mvolt) |
| 47 | { |
| 48 | int ret; |
| 49 | u8 cfg, enable_mask = 1U << (dcdc_num - 1); |
| 50 | int volt_reg = AXP313_DCDC1_CTRL + dcdc_num - 1; |
| 51 | int max_mV; |
| 52 | |
| 53 | switch (dcdc_num) { |
| 54 | case 1: |
| 55 | case 2: |
| 56 | max_mV = 1540; |
| 57 | break; |
| 58 | case 3: |
| 59 | /* |
| 60 | * The manual defines a different split point, but tests |
| 61 | * show that it's the same 1200mV as for DCDC1/2. |
| 62 | */ |
| 63 | max_mV = 1840; |
| 64 | break; |
| 65 | default: |
| 66 | return -EINVAL; |
| 67 | } |
| 68 | |
| 69 | if (mvolt > AXP313_DCDC_SPLIT_MVOLT) |
| 70 | cfg = AXP313_DCDC_SPLIT_OFFSET + mvolt_to_cfg(mvolt, |
| 71 | AXP313_DCDC_SPLIT_MVOLT + 20, max_mV, 20); |
| 72 | else |
| 73 | cfg = mvolt_to_cfg(mvolt, 500, AXP313_DCDC_SPLIT_MVOLT, 10); |
| 74 | |
| 75 | if (mvolt == 0) |
| 76 | return pmic_bus_clrbits(AXP313_OUTPUT_CTRL, enable_mask); |
| 77 | |
| 78 | debug("DCDC%d: writing 0x%x to reg 0x%x\n", dcdc_num, cfg, volt_reg); |
| 79 | ret = pmic_bus_write(volt_reg, cfg); |
| 80 | if (ret) |
| 81 | return ret; |
| 82 | |
| 83 | return pmic_bus_setbits(AXP313_OUTPUT_CTRL, enable_mask); |
| 84 | } |
| 85 | |
| 86 | int axp_set_dcdc2(unsigned int mvolt) |
| 87 | { |
| 88 | return axp_set_dcdc(2, mvolt); |
| 89 | } |
| 90 | |
| 91 | int axp_set_dcdc3(unsigned int mvolt) |
| 92 | { |
| 93 | return axp_set_dcdc(3, mvolt); |
| 94 | } |
| 95 | |
| 96 | int axp_init(void) |
| 97 | { |
| 98 | u8 axp_chip_id; |
| 99 | int ret; |
| 100 | |
| 101 | ret = pmic_bus_init(); |
| 102 | if (ret) |
| 103 | return ret; |
| 104 | |
| 105 | ret = pmic_bus_read(AXP313_CHIP_VERSION, &axp_chip_id); |
| 106 | if (ret) |
| 107 | return ret; |
| 108 | |
| 109 | axp_chip_id &= AXP313_CHIP_VERSION_MASK; |
| 110 | switch (axp_chip_id) { |
| 111 | case AXP313_CHIP_VERSION_AXP1530: |
| 112 | case AXP313_CHIP_VERSION_AXP313A: |
| 113 | case AXP313_CHIP_VERSION_AXP313B: |
| 114 | break; |
| 115 | default: |
| 116 | debug("unknown PMIC: 0x%x\n", axp_chip_id); |
| 117 | return -EINVAL; |
| 118 | } |
| 119 | |
| 120 | return ret; |
| 121 | } |
| 122 | |
| 123 | #if !CONFIG_IS_ENABLED(ARM_PSCI_FW) && !IS_ENABLED(CONFIG_SYSRESET_CMD_POWEROFF) |
| 124 | int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) |
| 125 | { |
| 126 | pmic_bus_write(AXP313_SHUTDOWN, AXP313_POWEROFF); |
| 127 | |
| 128 | /* infinite loop during shutdown */ |
| 129 | while (1) {} |
| 130 | |
| 131 | /* not reached */ |
| 132 | return 0; |
| 133 | } |
| 134 | #endif |