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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2011-2013
- * Texas Instruments, <www.ti.com>
- */
- #include <common.h>
- #include <i2c.h>
- #include <linux/errno.h>
- #include <power/pmic.h>
- #include <power/tps65218.h>
- #if !CONFIG_IS_ENABLED(DM_I2C)
- 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;
- }
- #else
- struct udevice *tps65218_dev __attribute__((section(".data"))) = NULL;
- int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
- {
- uchar read_val;
- int ret;
- if (!tps65218_dev)
- return -ENODEV;
- ret = dm_i2c_read(tps65218_dev, dest_reg, &read_val, 1);
- if (ret)
- return ret;
- *dest_val = read_val;
- return 0;
- }
- int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
- uchar mask)
- {
- uchar read_val;
- uchar xor_reg;
- int ret;
- if (!tps65218_dev)
- return -ENODEV;
- /*
- * If we are affecting only a bit field, read dest_reg and apply the
- * mask
- */
- if (mask != TPS65218_MASK_ALL_BITS) {
- ret = dm_i2c_read(tps65218_dev, dest_reg, &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 = dm_i2c_write(tps65218_dev, TPS65218_PASSWORD, &xor_reg,
- 1);
- if (ret)
- return ret;
- }
- ret = dm_i2c_write(tps65218_dev, dest_reg, &dest_val, 1);
- if (ret)
- return ret;
- if (prot_level == TPS65218_PROT_LEVEL_2) {
- ret = dm_i2c_write(tps65218_dev, TPS65218_PASSWORD, &xor_reg,
- 1);
- if (ret)
- return ret;
- ret = dm_i2c_write(tps65218_dev, dest_reg, &dest_val, 1);
- if (ret)
- return ret;
- }
- return 0;
- }
- #endif
- /**
- * 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;
- }
- #if !CONFIG_IS_ENABLED(DM_I2C)
- 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;
- }
- #else
- int power_tps65218_init(unsigned char bus)
- {
- struct udevice *dev = NULL;
- int rc;
- rc = i2c_get_chip_for_busnum(bus, TPS65218_CHIP_PM, 1, &dev);
- if (rc)
- return rc;
- tps65218_dev = dev;
- return 0;
- }
- #endif
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