| Tom Rini | 0634fc0 | 2014-06-05 11:15:29 -0400 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2011-2013 |
| 3 | * Texas Instruments, <www.ti.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <i2c.h> |
| 10 | #include <power/tps65218.h> |
| 11 | |
| 12 | /** |
| 13 | * tps65218_reg_write() - Generic function that can write a TPS65218 PMIC |
| 14 | * register or bit field regardless of protection |
| 15 | * level. |
| 16 | * |
| 17 | * @prot_level: Register password protection. Use |
| 18 | * TPS65218_PROT_LEVEL_NONE, |
| 19 | * TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2 |
| 20 | * @dest_reg: Register address to write. |
| 21 | * @dest_val: Value to write. |
| 22 | * @mask: Bit mask (8 bits) to be applied. Function will only |
| 23 | * change bits that are set in the bit mask. |
| 24 | * |
| 25 | * @return: 0 for success, not 0 on failure, as per the i2c API |
| 26 | */ |
| 27 | int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val, |
| 28 | uchar mask) |
| 29 | { |
| 30 | uchar read_val; |
| 31 | uchar xor_reg; |
| 32 | int ret; |
| 33 | |
| 34 | /* |
| 35 | * If we are affecting only a bit field, read dest_reg and apply the |
| 36 | * mask |
| 37 | */ |
| 38 | if (mask != TPS65218_MASK_ALL_BITS) { |
| 39 | ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1); |
| 40 | if (ret) |
| 41 | return ret; |
| 42 | read_val &= (~mask); |
| 43 | read_val |= (dest_val & mask); |
| 44 | dest_val = read_val; |
| 45 | } |
| 46 | |
| 47 | if (prot_level > 0) { |
| 48 | xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK; |
| 49 | ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1, |
| 50 | &xor_reg, 1); |
| 51 | if (ret) |
| 52 | return ret; |
| 53 | } |
| 54 | |
| 55 | ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| 56 | if (ret) |
| 57 | return ret; |
| 58 | |
| 59 | if (prot_level == TPS65218_PROT_LEVEL_2) { |
| 60 | ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1, |
| 61 | &xor_reg, 1); |
| 62 | if (ret) |
| 63 | return ret; |
| 64 | |
| 65 | ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| 66 | if (ret) |
| 67 | return ret; |
| 68 | } |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * tps65218_voltage_update() - Function to change a voltage level, as this |
| 75 | * is a multi-step process. |
| 76 | * @dc_cntrl_reg: DC voltage control register to change. |
| 77 | * @volt_sel: New value for the voltage register |
| 78 | * @return: 0 for success, not 0 on failure. |
| 79 | */ |
| 80 | int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel) |
| 81 | { |
| 82 | if ((dc_cntrl_reg != TPS65218_DCDC1) && |
| 83 | (dc_cntrl_reg != TPS65218_DCDC2)) |
| 84 | return 1; |
| 85 | |
| 86 | /* set voltage level */ |
| 87 | if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel, |
| 88 | TPS65218_MASK_ALL_BITS)) |
| 89 | return 1; |
| 90 | |
| 91 | /* set GO bit to initiate voltage transition */ |
| 92 | if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW, |
| 93 | TPS65218_DCDC_GO, TPS65218_DCDC_GO)) |
| 94 | return 1; |
| 95 | |
| 96 | return 0; |
| 97 | } |