1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2011-2013 4 * Texas Instruments, <www.ti.com> 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 } 109