120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
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* (C) Copyright 2011-2013
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* Texas Instruments, <www.ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <i2c.h>
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#include <asm/errno.h>
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#include <power/pmic.h>
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#include <power/tps65218.h>
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/**
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* tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
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* register or bit field regardless of protection
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* level.
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*
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* @prot_level: Register password protection. Use
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* TPS65218_PROT_LEVEL_NONE,
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* TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2
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* @dest_reg: Register address to write.
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* @dest_val: Value to write.
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* @mask: Bit mask (8 bits) to be applied. Function will only
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* change bits that are set in the bit mask.
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*
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* @return: 0 for success, not 0 on failure, as per the i2c API
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*/
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int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
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uchar mask)
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{
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uchar read_val;
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uchar xor_reg;
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int ret;
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/*
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* If we are affecting only a bit field, read dest_reg and apply the
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* mask
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*/
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if (mask != TPS65218_MASK_ALL_BITS) {
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ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
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if (ret)
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return ret;
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read_val &= (~mask);
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read_val |= (dest_val & mask);
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dest_val = read_val;
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}
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if (prot_level > 0) {
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xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
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ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
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&xor_reg, 1);
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if (ret)
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return ret;
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}
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ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
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if (ret)
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return ret;
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if (prot_level == TPS65218_PROT_LEVEL_2) {
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ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
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&xor_reg, 1);
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if (ret)
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return ret;
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ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* tps65218_voltage_update() - Function to change a voltage level, as this
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* is a multi-step process.
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* @dc_cntrl_reg: DC voltage control register to change.
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* @volt_sel: New value for the voltage register
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* @return: 0 for success, not 0 on failure.
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*/
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int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
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{
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if ((dc_cntrl_reg != TPS65218_DCDC1) &&
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(dc_cntrl_reg != TPS65218_DCDC2))
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return 1;
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/* set voltage level */
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if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
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TPS65218_MASK_ALL_BITS))
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return 1;
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/* set GO bit to initiate voltage transition */
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if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
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TPS65218_DCDC_GO, TPS65218_DCDC_GO))
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return 1;
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return 0;
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}
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int power_tps65218_init(unsigned char bus)
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{
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static const char name[] = "TPS65218_PMIC";
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struct pmic *p = pmic_alloc();
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if (!p) {
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printf("%s: POWER allocation error!\n", __func__);
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return -ENOMEM;
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}
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p->name = name;
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p->interface = PMIC_I2C;
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p->number_of_regs = TPS65218_PMIC_NUM_OF_REGS;
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p->hw.i2c.addr = TPS65218_CHIP_PM;
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p->hw.i2c.tx_num = 1;
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p->bus = bus;
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return 0;
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}
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