forked from rrcarlosr/Jetpack
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
|
/*
|
||
|
|
* (C) Copyright 2011-2013
|
||
|
|
* Texas Instruments, <www.ti.com>
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: GPL-2.0+
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <common.h>
|
||
|
|
#include <i2c.h>
|
||
|
|
#include <power/tps65217.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tps65217_reg_read() - Generic function that can read a TPS65217 register
|
||
|
|
* @src_reg: Source register address
|
||
|
|
* @src_val: Address of destination variable
|
||
|
|
* @return: 0 for success, not 0 on failure.
|
||
|
|
*/
|
||
|
|
int tps65217_reg_read(uchar src_reg, uchar *src_val)
|
||
|
|
{
|
||
|
|
return i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tps65217_reg_write() - Generic function that can write a TPS65217 PMIC
|
||
|
|
* register or bit field regardless of protection
|
||
|
|
* level.
|
||
|
|
*
|
||
|
|
* @prot_level: Register password protection. Use
|
||
|
|
* TPS65217_PROT_LEVEL_NONE,
|
||
|
|
* TPS65217_PROT_LEVEL_1 or TPS65217_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 tps65217_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 != TPS65217_MASK_ALL_BITS) {
|
||
|
|
ret = i2c_read(TPS65217_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 ^ TPS65217_PASSWORD_UNLOCK;
|
||
|
|
ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
|
||
|
|
&xor_reg, 1);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (prot_level == TPS65217_PROT_LEVEL_2) {
|
||
|
|
ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
|
||
|
|
&xor_reg, 1);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* tps65217_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 tps65217_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
|
||
|
|
{
|
||
|
|
if ((dc_cntrl_reg != TPS65217_DEFDCDC1) &&
|
||
|
|
(dc_cntrl_reg != TPS65217_DEFDCDC2) &&
|
||
|
|
(dc_cntrl_reg != TPS65217_DEFDCDC3))
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
/* set voltage level */
|
||
|
|
if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
|
||
|
|
TPS65217_MASK_ALL_BITS))
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
/* set GO bit to initiate voltage transition */
|
||
|
|
if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, TPS65217_DEFSLEW,
|
||
|
|
TPS65217_DCDC_GO, TPS65217_DCDC_GO))
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|