Icenowy Zheng | 7508bef | 2018-07-21 20:41:12 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. |
| 3 | * Copyright (c) 2018, Icenowy Zheng <icenowy@aosc.io> |
| 4 | * |
| 5 | * SPDX-License-Identifier: BSD-3-Clause |
| 6 | */ |
| 7 | |
Icenowy Zheng | bd57eb5 | 2018-07-22 21:52:50 +0800 | [diff] [blame] | 8 | #include <arch_helpers.h> |
Icenowy Zheng | 7508bef | 2018-07-21 20:41:12 +0800 | [diff] [blame] | 9 | #include <debug.h> |
Icenowy Zheng | 8d76982 | 2018-07-22 21:30:14 +0800 | [diff] [blame] | 10 | #include <delay_timer.h> |
| 11 | #include <errno.h> |
| 12 | #include <mmio.h> |
| 13 | #include <mentor/mi2cv.h> |
| 14 | #include <string.h> |
| 15 | #include <sunxi_mmap.h> |
| 16 | |
| 17 | #define AXP805_ADDR 0x36 |
| 18 | #define AXP805_ID 0x03 |
| 19 | |
| 20 | enum pmic_type { |
| 21 | NO_PMIC, |
| 22 | AXP805, |
| 23 | }; |
| 24 | |
| 25 | enum pmic_type pmic; |
| 26 | |
| 27 | static int sunxi_init_r_i2c(void) |
| 28 | { |
| 29 | uint32_t reg; |
| 30 | |
| 31 | /* get currently configured function for pins PL0 and PL1 */ |
| 32 | reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x00); |
| 33 | if ((reg & 0xff) == 0x33) { |
| 34 | NOTICE("PMIC: already configured for TWI\n"); |
| 35 | } |
| 36 | |
| 37 | /* switch pins PL0 and PL1 to I2C */ |
| 38 | mmio_write_32(SUNXI_R_PIO_BASE + 0x00, (reg & ~0xff) | 0x33); |
| 39 | |
| 40 | /* level 2 drive strength */ |
| 41 | reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x14); |
| 42 | mmio_write_32(SUNXI_R_PIO_BASE + 0x14, (reg & ~0x0f) | 0xa); |
| 43 | |
| 44 | /* set both ports to pull-up */ |
| 45 | reg = mmio_read_32(SUNXI_R_PIO_BASE + 0x1c); |
| 46 | mmio_write_32(SUNXI_R_PIO_BASE + 0x1c, (reg & ~0x0f) | 0x5); |
| 47 | |
| 48 | /* assert & de-assert reset of R_I2C */ |
| 49 | reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c); |
| 50 | mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, 0); |
| 51 | reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c); |
| 52 | mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, reg | 0x00010000); |
| 53 | |
| 54 | /* un-gate R_I2C clock */ |
| 55 | reg = mmio_read_32(SUNXI_R_PRCM_BASE + 0x19c); |
| 56 | mmio_write_32(SUNXI_R_PRCM_BASE + 0x19c, reg | 0x00000001); |
| 57 | |
| 58 | /* call mi2cv driver */ |
| 59 | i2c_init((void *)SUNXI_R_I2C_BASE); |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | int axp_i2c_read(uint8_t chip, uint8_t reg, uint8_t *val) |
| 65 | { |
| 66 | int ret; |
| 67 | |
| 68 | ret = i2c_write(chip, 0, 0, ®, 1); |
| 69 | if (ret) |
| 70 | return ret; |
| 71 | |
| 72 | return i2c_read(chip, 0, 0, val, 1); |
| 73 | } |
| 74 | |
| 75 | int axp_i2c_write(uint8_t chip, uint8_t reg, uint8_t val) |
| 76 | { |
| 77 | return i2c_write(chip, reg, 1, &val, 1); |
| 78 | } |
| 79 | |
| 80 | static int axp805_probe(void) |
| 81 | { |
| 82 | int ret; |
| 83 | uint8_t val; |
| 84 | |
| 85 | ret = axp_i2c_write(AXP805_ADDR, 0xff, 0x0); |
| 86 | if (ret) { |
| 87 | ERROR("PMIC: Cannot put AXP805 to master mode.\n"); |
| 88 | return -EPERM; |
| 89 | } |
| 90 | |
| 91 | ret = axp_i2c_read(AXP805_ADDR, AXP805_ID, &val); |
| 92 | |
| 93 | if (!ret && ((val & 0xcf) == 0x40)) |
| 94 | NOTICE("PMIC: AXP805 detected\n"); |
| 95 | else if (ret) { |
| 96 | ERROR("PMIC: Cannot communicate with AXP805.\n"); |
| 97 | return -EPERM; |
| 98 | } else { |
| 99 | ERROR("PMIC: Non-AXP805 chip attached at AXP805's address.\n"); |
| 100 | return -EINVAL; |
| 101 | } |
| 102 | |
| 103 | return 0; |
| 104 | } |
Icenowy Zheng | 7508bef | 2018-07-21 20:41:12 +0800 | [diff] [blame] | 105 | |
| 106 | int sunxi_pmic_setup(void) |
| 107 | { |
Icenowy Zheng | 8d76982 | 2018-07-22 21:30:14 +0800 | [diff] [blame] | 108 | int ret; |
| 109 | |
| 110 | sunxi_init_r_i2c(); |
| 111 | |
| 112 | NOTICE("PMIC: Probing AXP805\n"); |
| 113 | pmic = AXP805; |
| 114 | |
| 115 | ret = axp805_probe(); |
| 116 | if (ret) |
| 117 | pmic = NO_PMIC; |
| 118 | else |
| 119 | pmic = AXP805; |
Icenowy Zheng | 7508bef | 2018-07-21 20:41:12 +0800 | [diff] [blame] | 120 | |
| 121 | return 0; |
| 122 | } |
Icenowy Zheng | bd57eb5 | 2018-07-22 21:52:50 +0800 | [diff] [blame] | 123 | |
| 124 | void __dead2 sunxi_power_down(void) |
| 125 | { |
| 126 | uint8_t val; |
| 127 | |
| 128 | switch (pmic) { |
| 129 | case AXP805: |
| 130 | val = 0x26; /* Default value for REG 32H */ |
| 131 | axp_i2c_read(AXP805_ADDR, 0x32, &val); |
| 132 | val |= 0x80; |
| 133 | axp_i2c_write(AXP805_ADDR, 0x32, val); |
| 134 | break; |
| 135 | default: |
| 136 | break; |
| 137 | } |
| 138 | |
| 139 | udelay(1000); |
| 140 | ERROR("PSCI: Cannot communicate with PMIC, halting\n"); |
| 141 | wfi(); |
| 142 | panic(); |
| 143 | } |