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* Copyright (c) 2011 The Chromium OS Authors.
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* (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
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* SPDX-License-Identifier: GPL-2.0+
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static int bus_num; /* I2C bus we are on */
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#define I2C_ADDRESS 0x34 /* chip requires this address */
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static char inited; /* 1 if we have been inited */
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/* Registers that we access */
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SUPPLY_CONTROL1 = 0x20,
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SM1_VOLTAGE_V1 = 0x23,
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SM0_VOLTAGE_V1 = 0x26,
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/* Bits in the supply control registers */
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CTRL_SM1_SUPPLY2 = 0x02,
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CTRL_SM0_SUPPLY2 = 0x08,
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#define MAX_I2C_RETRY 3
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static int tps6586x_read(int reg)
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old_bus_num = i2c_get_bus_num();
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i2c_set_bus_num(bus_num);
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for (i = 0; i < MAX_I2C_RETRY; ++i) {
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if (!i2c_read(I2C_ADDRESS, reg, 1, &data, 1)) {
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/* i2c access failed, retry */
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i2c_set_bus_num(old_bus_num);
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debug("pmu_read %x=%x\n", reg, retval);
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debug("%s: failed to read register %#x: %d\n", __func__, reg,
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static int tps6586x_write(int reg, uchar *data, uint len)
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old_bus_num = i2c_get_bus_num();
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i2c_set_bus_num(bus_num);
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for (i = 0; i < MAX_I2C_RETRY; ++i) {
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if (!i2c_write(I2C_ADDRESS, reg, 1, data, len)) {
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/* i2c access failed, retry */
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i2c_set_bus_num(old_bus_num);
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debug("pmu_write %x=%x: ", reg, retval);
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for (i = 0; i < len; i++)
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debug("%x ", data[i]);
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debug("%s: failed to write register %#x\n", __func__, reg);
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* Get current voltage of SM0 and SM1
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* @param sm0 Place to put SM0 voltage
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* @param sm1 Place to put SM1 voltage
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* @return 0 if ok, -1 on error
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static int read_voltages(int *sm0, int *sm1)
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* Each vdd has two supply sources, ie, v1 and v2.
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* The supply control reg1 and reg2 determine the current selection.
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ctrl1 = tps6586x_read(SUPPLY_CONTROL1);
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ctrl2 = tps6586x_read(SUPPLY_CONTROL2);
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if (ctrl1 == -1 || ctrl2 == -1)
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/* Figure out whether V1 or V2 is selected */
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is_v2 = (ctrl1 | ctrl2) & CTRL_SM0_SUPPLY2;
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*sm0 = tps6586x_read(is_v2 ? SM0_VOLTAGE_V2 : SM0_VOLTAGE_V1);
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*sm1 = tps6586x_read(is_v2 ? SM1_VOLTAGE_V2 : SM1_VOLTAGE_V1);
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if (*sm0 == -1 || *sm1 == -1)
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static int set_voltage(int reg, int data, int rate)
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control_bit = (reg == SM0_VOLTAGE_V1 ? CTRL_SM0_RAMP : CTRL_SM1_RAMP);
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* Only one supply is needed in u-boot. set both v1 and v2 to
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* When both v1 and v2 are set to same value, we just need to set
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* control1 reg to trigger the supply selection.
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buff[0] = buff[1] = (uchar)data;
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/* write v1, v2 and rate, then trigger */
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if (tps6586x_write(reg, buff, 3) ||
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tps6586x_write(SUPPLY_CONTROL1, &control_bit, 1))
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static int calculate_next_voltage(int voltage, int target, int step)
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int diff = voltage < target ? step : -step;
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if (abs(target - voltage) > step)
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int tps6586x_set_pwm_mode(int mask)
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ret = tps6586x_read(PFM_MODE);
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ret = tps6586x_write(PFM_MODE, &val, 1);
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debug("%s: Failed to read/write PWM mode reg\n", __func__);
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int tps6586x_adjust_sm0_sm1(int sm0_target, int sm1_target, int step, int rate,
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int min_sm0_over_sm1)
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/* get current voltage settings */
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if (read_voltages(&sm0, &sm1)) {
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debug("%s: Cannot read voltage settings\n", __func__);
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* if vdd_core < vdd_cpu + rel
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* This condition may happen when system reboots due to kernel crash.
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if (min_sm0_over_sm1 != -1 && sm0 < sm1 + min_sm0_over_sm1) {
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debug("%s: SM0 is %d, SM1 is %d, but min_sm0_over_sm1 is %d\n",
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__func__, sm0, sm1, min_sm0_over_sm1);
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* Since vdd_core and vdd_cpu may both stand at either greater or less
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* than their nominal voltage, the adjustment may go either directions.
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* Make sure vdd_core is always higher than vdd_cpu with certain margin.
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* So, find out which vdd to adjust first in each step.
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* case 1: both sm0 and sm1 need to move up
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* adjust sm0 before sm1
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* case 2: both sm0 and sm1 need to move down
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* adjust sm1 before sm0
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* case 3: sm0 moves down and sm1 moves up
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* adjusting either one first is fine.
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* Adjust vdd_core and vdd_cpu one step at a time until they reach
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* their nominal values.
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while (!bad && (sm0 != sm0_target || sm1 != sm1_target)) {
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int adjust_sm0_late = 0; /* flag to adjust vdd_core later */
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debug("%d-%d %d-%d ", sm0, sm0_target, sm1, sm1_target);
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if (sm0 != sm0_target) {
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* if case 1 and case 3, set new sm0 first.
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* otherwise, hold down until new sm1 is set.
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sm0 = calculate_next_voltage(sm0, sm0_target, step);
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if (sm1 < sm1_target)
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bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
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if (sm1 != sm1_target) {
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sm1 = calculate_next_voltage(sm1, sm1_target, step);
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bad |= set_voltage(SM1_VOLTAGE_V1, sm1, rate);
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bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
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debug("%d\n", adjust_sm0_late);
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debug("%d-%d %d-%d done\n", sm0, sm0_target, sm1, sm1_target);
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int tps6586x_init(int bus)