pmic_tps65218.c
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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 <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;
}