2 * (C) Copyright 2011-2013
3 * Texas Instruments, <www.ti.com>
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <linux/errno.h>
11 #include <power/pmic.h>
12 #include <power/tps65218.h>
14 int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
19 ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
29 * tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
30 * register or bit field regardless of protection
33 * @prot_level: Register password protection. Use
34 * TPS65218_PROT_LEVEL_NONE,
35 * TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2
36 * @dest_reg: Register address to write.
37 * @dest_val: Value to write.
38 * @mask: Bit mask (8 bits) to be applied. Function will only
39 * change bits that are set in the bit mask.
41 * @return: 0 for success, not 0 on failure, as per the i2c API
43 int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
51 * If we are affecting only a bit field, read dest_reg and apply the
54 if (mask != TPS65218_MASK_ALL_BITS) {
55 ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
59 read_val |= (dest_val & mask);
64 xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
65 ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
71 ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
75 if (prot_level == TPS65218_PROT_LEVEL_2) {
76 ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
81 ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
90 * tps65218_voltage_update() - Function to change a voltage level, as this
91 * is a multi-step process.
92 * @dc_cntrl_reg: DC voltage control register to change.
93 * @volt_sel: New value for the voltage register
94 * @return: 0 for success, not 0 on failure.
96 int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
98 if ((dc_cntrl_reg != TPS65218_DCDC1) &&
99 (dc_cntrl_reg != TPS65218_DCDC2))
102 /* set voltage level */
103 if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
104 TPS65218_MASK_ALL_BITS))
107 /* set GO bit to initiate voltage transition */
108 if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
109 TPS65218_DCDC_GO, TPS65218_DCDC_GO))
116 * tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit.
118 * @return: 0 on success, -EBADE if the sequence was broken
120 int tps65218_toggle_fseal(void)
122 if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
123 0xb1, TPS65218_MASK_ALL_BITS))
126 if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
127 0xfe, TPS65218_MASK_ALL_BITS))
130 if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
131 0xa3, TPS65218_MASK_ALL_BITS))
138 * tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1.
140 * The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be
141 * toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch
142 * its value is locked and can only be reset by powering off the PMIC entirely.
144 * @return: 0 on success, -EBADE if the sequence was broken
146 int tps65218_lock_fseal(void)
150 for (i = 0; i < 3; i++)
151 if (tps65218_toggle_fseal())
157 int power_tps65218_init(unsigned char bus)
159 static const char name[] = "TPS65218_PMIC";
160 struct pmic *p = pmic_alloc();
163 printf("%s: POWER allocation error!\n", __func__);
168 p->interface = PMIC_I2C;
169 p->number_of_regs = TPS65218_PMIC_NUM_OF_REGS;
170 p->hw.i2c.addr = TPS65218_CHIP_PM;
171 p->hw.i2c.tx_num = 1;