| Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| Greg Guyotte | ea6f27c | 2013-08-30 16:28:42 -0400 | [diff] [blame] | 2 | /* |
| 3 | * (C) Copyright 2011-2013 |
| 4 | * Texas Instruments, <www.ti.com> |
| Greg Guyotte | ea6f27c | 2013-08-30 16:28:42 -0400 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <i2c.h> |
| 9 | #include <power/tps65217.h> |
| 10 | |
| 11 | /** |
| 12 | * tps65217_reg_read() - Generic function that can read a TPS65217 register |
| 13 | * @src_reg: Source register address |
| 14 | * @src_val: Address of destination variable |
| 15 | * @return: 0 for success, not 0 on failure. |
| 16 | */ |
| 17 | int tps65217_reg_read(uchar src_reg, uchar *src_val) |
| 18 | { |
| 19 | return i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1); |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * tps65217_reg_write() - Generic function that can write a TPS65217 PMIC |
| 24 | * register or bit field regardless of protection |
| 25 | * level. |
| 26 | * |
| 27 | * @prot_level: Register password protection. Use |
| 28 | * TPS65217_PROT_LEVEL_NONE, |
| 29 | * TPS65217_PROT_LEVEL_1 or TPS65217_PROT_LEVEL_2 |
| 30 | * @dest_reg: Register address to write. |
| 31 | * @dest_val: Value to write. |
| 32 | * @mask: Bit mask (8 bits) to be applied. Function will only |
| 33 | * change bits that are set in the bit mask. |
| 34 | * |
| 35 | * @return: 0 for success, not 0 on failure, as per the i2c API |
| 36 | */ |
| 37 | int tps65217_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val, |
| 38 | uchar mask) |
| 39 | { |
| 40 | uchar read_val; |
| 41 | uchar xor_reg; |
| 42 | int ret; |
| 43 | |
| 44 | /* |
| 45 | * If we are affecting only a bit field, read dest_reg and apply the |
| 46 | * mask |
| 47 | */ |
| 48 | if (mask != TPS65217_MASK_ALL_BITS) { |
| 49 | ret = i2c_read(TPS65217_CHIP_PM, dest_reg, 1, &read_val, 1); |
| 50 | if (ret) |
| 51 | return ret; |
| 52 | read_val &= (~mask); |
| 53 | read_val |= (dest_val & mask); |
| 54 | dest_val = read_val; |
| 55 | } |
| 56 | |
| 57 | if (prot_level > 0) { |
| 58 | xor_reg = dest_reg ^ TPS65217_PASSWORD_UNLOCK; |
| 59 | ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1, |
| 60 | &xor_reg, 1); |
| 61 | if (ret) |
| 62 | return ret; |
| 63 | } |
| 64 | |
| 65 | ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| 66 | if (ret) |
| 67 | return ret; |
| 68 | |
| 69 | if (prot_level == TPS65217_PROT_LEVEL_2) { |
| 70 | ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1, |
| 71 | &xor_reg, 1); |
| 72 | if (ret) |
| 73 | return ret; |
| 74 | |
| 75 | ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| 76 | if (ret) |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * tps65217_voltage_update() - Function to change a voltage level, as this |
| 85 | * is a multi-step process. |
| 86 | * @dc_cntrl_reg: DC voltage control register to change. |
| 87 | * @volt_sel: New value for the voltage register |
| 88 | * @return: 0 for success, not 0 on failure. |
| 89 | */ |
| 90 | int tps65217_voltage_update(uchar dc_cntrl_reg, uchar volt_sel) |
| 91 | { |
| 92 | if ((dc_cntrl_reg != TPS65217_DEFDCDC1) && |
| 93 | (dc_cntrl_reg != TPS65217_DEFDCDC2) && |
| 94 | (dc_cntrl_reg != TPS65217_DEFDCDC3)) |
| 95 | return 1; |
| 96 | |
| 97 | /* set voltage level */ |
| 98 | if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, dc_cntrl_reg, volt_sel, |
| 99 | TPS65217_MASK_ALL_BITS)) |
| 100 | return 1; |
| 101 | |
| 102 | /* set GO bit to initiate voltage transition */ |
| 103 | if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, TPS65217_DEFSLEW, |
| 104 | TPS65217_DCDC_GO, TPS65217_DCDC_GO)) |
| 105 | return 1; |
| 106 | |
| 107 | return 0; |
| 108 | } |