// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2011-2013 * Texas Instruments, <www.ti.com> */ #include <common.h> #include <i2c.h> #include <linux/errno.h> #include <power/pmic.h> #include <power/tps65218.h> int tps65218_reg_read(uchar dest_reg, uchar *dest_val) { uchar read_val; int ret; ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1); if (ret) return ret; *dest_val = read_val; return 0; } /** * tps65218_reg_write() - Generic function that can write a TPS65218 PMIC * register or bit field regardless of protection * level. * * @prot_level: Register password protection. Use * TPS65218_PROT_LEVEL_NONE, * TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2 * @dest_reg: Register address to write. * @dest_val: Value to write. * @mask: Bit mask (8 bits) to be applied. Function will only * change bits that are set in the bit mask. * * @return: 0 for success, not 0 on failure, as per the i2c API */ int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val, uchar mask) { uchar read_val; uchar xor_reg; int ret; /* * If we are affecting only a bit field, read dest_reg and apply the * mask */ if (mask != TPS65218_MASK_ALL_BITS) { ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1); if (ret) return ret; read_val &= (~mask); read_val |= (dest_val & mask); dest_val = read_val; } if (prot_level > 0) { xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK; ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1, &xor_reg, 1); if (ret) return ret; } ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1); if (ret) return ret; if (prot_level == TPS65218_PROT_LEVEL_2) { ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1, &xor_reg, 1); if (ret) return ret; ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1); if (ret) return ret; } return 0; } /** * tps65218_voltage_update() - Function to change a voltage level, as this * is a multi-step process. * @dc_cntrl_reg: DC voltage control register to change. * @volt_sel: New value for the voltage register * @return: 0 for success, not 0 on failure. */ int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel) { if ((dc_cntrl_reg != TPS65218_DCDC1) && (dc_cntrl_reg != TPS65218_DCDC2) && (dc_cntrl_reg != TPS65218_DCDC3)) return 1; /* set voltage level */ if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel, TPS65218_DCDC_VSEL_MASK)) return 1; /* set GO bit to initiate voltage transition */ if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW, TPS65218_DCDC_GO, TPS65218_DCDC_GO)) return 1; return 0; } /** * tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit. * * @return: 0 on success, -EBADE if the sequence was broken */ int tps65218_toggle_fseal(void) { if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD, 0xb1, TPS65218_MASK_ALL_BITS)) return -EBADE; if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD, 0xfe, TPS65218_MASK_ALL_BITS)) return -EBADE; if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD, 0xa3, TPS65218_MASK_ALL_BITS)) return -EBADE; return 0; } /** * tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1. * * The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be * toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch * its value is locked and can only be reset by powering off the PMIC entirely. * * @return: 0 on success, -EBADE if the sequence was broken */ int tps65218_lock_fseal(void) { int i; for (i = 0; i < 3; i++) if (tps65218_toggle_fseal()) return -EBADE; return 0; } int power_tps65218_init(unsigned char bus) { static const char name[] = "TPS65218_PMIC"; struct pmic *p = pmic_alloc(); if (!p) { printf("%s: POWER allocation error!\n", __func__); return -ENOMEM; } p->name = name; p->interface = PMIC_I2C; p->number_of_regs = TPS65218_PMIC_NUM_OF_REGS; p->hw.i2c.addr = TPS65218_CHIP_PM; p->hw.i2c.tx_num = 1; p->bus = bus; return 0; }