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/*
* (C) Copyright 2011-2013
* Texas Instruments, <www.ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
#include <power/tps65218.h>
/**
* 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))
return 1;
/* set voltage level */
if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
TPS65218_MASK_ALL_BITS))
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;
}
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