2 * Copyright (c) 2011 The Chromium OS Authors.
3 * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
5 * SPDX-License-Identifier: GPL-2.0+
13 static struct udevice *tps6586x_dev;
16 /* Registers that we access */
17 SUPPLY_CONTROL1 = 0x20,
19 SM1_VOLTAGE_V1 = 0x23,
21 SM0_VOLTAGE_V1 = 0x26,
25 /* Bits in the supply control registers */
27 CTRL_SM1_SUPPLY2 = 0x02,
29 CTRL_SM0_SUPPLY2 = 0x08,
32 #define MAX_I2C_RETRY 3
33 static int tps6586x_read(int reg)
39 for (i = 0; i < MAX_I2C_RETRY; ++i) {
40 if (!dm_i2c_read(tps6586x_dev, reg, &data, 1)) {
45 /* i2c access failed, retry */
50 debug("pmu_read %x=%x\n", reg, retval);
52 debug("%s: failed to read register %#x: %d\n", __func__, reg,
57 static int tps6586x_write(int reg, uchar *data, uint len)
62 for (i = 0; i < MAX_I2C_RETRY; ++i) {
63 if (!dm_i2c_write(tps6586x_dev, reg, data, len)) {
68 /* i2c access failed, retry */
73 debug("pmu_write %x=%x: ", reg, retval);
74 for (i = 0; i < len; i++)
75 debug("%x ", data[i]);
77 debug("%s: failed to write register %#x\n", __func__, reg);
82 * Get current voltage of SM0 and SM1
84 * @param sm0 Place to put SM0 voltage
85 * @param sm1 Place to put SM1 voltage
86 * @return 0 if ok, -1 on error
88 static int read_voltages(int *sm0, int *sm1)
94 * Each vdd has two supply sources, ie, v1 and v2.
95 * The supply control reg1 and reg2 determine the current selection.
97 ctrl1 = tps6586x_read(SUPPLY_CONTROL1);
98 ctrl2 = tps6586x_read(SUPPLY_CONTROL2);
99 if (ctrl1 == -1 || ctrl2 == -1)
102 /* Figure out whether V1 or V2 is selected */
103 is_v2 = (ctrl1 | ctrl2) & CTRL_SM0_SUPPLY2;
104 *sm0 = tps6586x_read(is_v2 ? SM0_VOLTAGE_V2 : SM0_VOLTAGE_V1);
105 *sm1 = tps6586x_read(is_v2 ? SM1_VOLTAGE_V2 : SM1_VOLTAGE_V1);
106 if (*sm0 == -1 || *sm1 == -1)
112 static int set_voltage(int reg, int data, int rate)
117 control_bit = (reg == SM0_VOLTAGE_V1 ? CTRL_SM0_RAMP : CTRL_SM1_RAMP);
120 * Only one supply is needed in u-boot. set both v1 and v2 to
123 * When both v1 and v2 are set to same value, we just need to set
124 * control1 reg to trigger the supply selection.
126 buff[0] = buff[1] = (uchar)data;
129 /* write v1, v2 and rate, then trigger */
130 if (tps6586x_write(reg, buff, 3) ||
131 tps6586x_write(SUPPLY_CONTROL1, &control_bit, 1))
137 static int calculate_next_voltage(int voltage, int target, int step)
139 int diff = voltage < target ? step : -step;
141 if (abs(target - voltage) > step)
149 int tps6586x_set_pwm_mode(int mask)
154 assert(tps6586x_dev);
155 ret = tps6586x_read(PFM_MODE);
160 ret = tps6586x_write(PFM_MODE, &val, 1);
164 debug("%s: Failed to read/write PWM mode reg\n", __func__);
169 int tps6586x_adjust_sm0_sm1(int sm0_target, int sm1_target, int step, int rate,
170 int min_sm0_over_sm1)
175 assert(tps6586x_dev);
177 /* get current voltage settings */
178 if (read_voltages(&sm0, &sm1)) {
179 debug("%s: Cannot read voltage settings\n", __func__);
184 * if vdd_core < vdd_cpu + rel
187 * This condition may happen when system reboots due to kernel crash.
189 if (min_sm0_over_sm1 != -1 && sm0 < sm1 + min_sm0_over_sm1) {
190 debug("%s: SM0 is %d, SM1 is %d, but min_sm0_over_sm1 is %d\n",
191 __func__, sm0, sm1, min_sm0_over_sm1);
196 * Since vdd_core and vdd_cpu may both stand at either greater or less
197 * than their nominal voltage, the adjustment may go either directions.
199 * Make sure vdd_core is always higher than vdd_cpu with certain margin.
200 * So, find out which vdd to adjust first in each step.
202 * case 1: both sm0 and sm1 need to move up
203 * adjust sm0 before sm1
205 * case 2: both sm0 and sm1 need to move down
206 * adjust sm1 before sm0
208 * case 3: sm0 moves down and sm1 moves up
209 * adjusting either one first is fine.
211 * Adjust vdd_core and vdd_cpu one step at a time until they reach
212 * their nominal values.
215 while (!bad && (sm0 != sm0_target || sm1 != sm1_target)) {
216 int adjust_sm0_late = 0; /* flag to adjust vdd_core later */
218 debug("%d-%d %d-%d ", sm0, sm0_target, sm1, sm1_target);
220 if (sm0 != sm0_target) {
222 * if case 1 and case 3, set new sm0 first.
223 * otherwise, hold down until new sm1 is set.
225 sm0 = calculate_next_voltage(sm0, sm0_target, step);
226 if (sm1 < sm1_target)
227 bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
232 if (sm1 != sm1_target) {
233 sm1 = calculate_next_voltage(sm1, sm1_target, step);
234 bad |= set_voltage(SM1_VOLTAGE_V1, sm1, rate);
238 bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
239 debug("%d\n", adjust_sm0_late);
241 debug("%d-%d %d-%d done\n", sm0, sm0_target, sm1, sm1_target);
243 return bad ? -EINVAL : 0;
246 int tps6586x_init(struct udevice *dev)