| Greg Guyotte | ea6f27c | 2013-08-30 16:28:42 -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/tps65217.h> |
| 11 | |
| 12 | /** |
| 13 | * tps65217_reg_read() - Generic function that can read a TPS65217 register |
| 14 | * @src_reg: Source register address |
| 15 | * @src_val: Address of destination variable |
| 16 | * @return: 0 for success, not 0 on failure. |
| 17 | */ |
| 18 | int tps65217_reg_read(uchar src_reg, uchar *src_val) |
| 19 | { |
| 20 | return i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1); |
| 21 | } |
| 22 | |
| 23 | /** |
| 24 | * tps65217_reg_write() - Generic function that can write a TPS65217 PMIC |
| 25 | * register or bit field regardless of protection |
| 26 | * level. |
| 27 | * |
| 28 | * @prot_level: Register password protection. Use |
| 29 | * TPS65217_PROT_LEVEL_NONE, |
| 30 | * TPS65217_PROT_LEVEL_1 or TPS65217_PROT_LEVEL_2 |
| 31 | * @dest_reg: Register address to write. |
| 32 | * @dest_val: Value to write. |
| 33 | * @mask: Bit mask (8 bits) to be applied. Function will only |
| 34 | * change bits that are set in the bit mask. |
| 35 | * |
| 36 | * @return: 0 for success, not 0 on failure, as per the i2c API |
| 37 | */ |
| 38 | int tps65217_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val, |
| 39 | uchar mask) |
| 40 | { |
| 41 | uchar read_val; |
| 42 | uchar xor_reg; |
| 43 | int ret; |
| 44 | |
| 45 | /* |
| 46 | * If we are affecting only a bit field, read dest_reg and apply the |
| 47 | * mask |
| 48 | */ |
| 49 | if (mask != TPS65217_MASK_ALL_BITS) { |
| 50 | ret = i2c_read(TPS65217_CHIP_PM, dest_reg, 1, &read_val, 1); |
| 51 | if (ret) |
| 52 | return ret; |
| 53 | read_val &= (~mask); |
| 54 | read_val |= (dest_val & mask); |
| 55 | dest_val = read_val; |
| 56 | } |
| 57 | |
| 58 | if (prot_level > 0) { |
| 59 | xor_reg = dest_reg ^ TPS65217_PASSWORD_UNLOCK; |
| 60 | ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1, |
| 61 | &xor_reg, 1); |
| 62 | if (ret) |
| 63 | return ret; |
| 64 | } |
| 65 | |
| 66 | ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| 67 | if (ret) |
| 68 | return ret; |
| 69 | |
| 70 | if (prot_level == TPS65217_PROT_LEVEL_2) { |
| 71 | ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1, |
| 72 | &xor_reg, 1); |
| 73 | if (ret) |
| 74 | return ret; |
| 75 | |
| 76 | ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1); |
| 77 | if (ret) |
| 78 | return ret; |
| 79 | } |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * tps65217_voltage_update() - Function to change a voltage level, as this |
| 86 | * is a multi-step process. |
| 87 | * @dc_cntrl_reg: DC voltage control register to change. |
| 88 | * @volt_sel: New value for the voltage register |
| 89 | * @return: 0 for success, not 0 on failure. |
| 90 | */ |
| 91 | int tps65217_voltage_update(uchar dc_cntrl_reg, uchar volt_sel) |
| 92 | { |
| 93 | if ((dc_cntrl_reg != TPS65217_DEFDCDC1) && |
| 94 | (dc_cntrl_reg != TPS65217_DEFDCDC2) && |
| 95 | (dc_cntrl_reg != TPS65217_DEFDCDC3)) |
| 96 | return 1; |
| 97 | |
| 98 | /* set voltage level */ |
| 99 | if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, dc_cntrl_reg, volt_sel, |
| 100 | TPS65217_MASK_ALL_BITS)) |
| 101 | return 1; |
| 102 | |
| 103 | /* set GO bit to initiate voltage transition */ |
| 104 | if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, TPS65217_DEFSLEW, |
| 105 | TPS65217_DCDC_GO, TPS65217_DCDC_GO)) |
| 106 | return 1; |
| 107 | |
| 108 | return 0; |
| 109 | } |