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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
175 lines
4.2 KiB
C
175 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#include <common.h>
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#include <i2c.h>
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#include <linux/errno.h>
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#include <power/pmic.h>
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#include <power/tps65218.h>
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int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
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{
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uchar read_val;
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int ret;
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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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*dest_val = read_val;
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return 0;
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}
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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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(dc_cntrl_reg != TPS65218_DCDC3))
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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_DCDC_VSEL_MASK))
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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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/**
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* tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit.
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*
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* @return: 0 on success, -EBADE if the sequence was broken
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*/
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int tps65218_toggle_fseal(void)
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{
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if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
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0xb1, TPS65218_MASK_ALL_BITS))
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return -EBADE;
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if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
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0xfe, TPS65218_MASK_ALL_BITS))
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return -EBADE;
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if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
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0xa3, TPS65218_MASK_ALL_BITS))
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return -EBADE;
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return 0;
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}
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/**
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* tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1.
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*
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* The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be
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* toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch
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* its value is locked and can only be reset by powering off the PMIC entirely.
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*
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* @return: 0 on success, -EBADE if the sequence was broken
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*/
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int tps65218_lock_fseal(void)
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{
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int i;
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for (i = 0; i < 3; i++)
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if (tps65218_toggle_fseal())
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return -EBADE;
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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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