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 } 110