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 } 98