1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2011 The Chromium OS Authors.
* (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
*/
#include <common.h>
#include <tps6586x.h>
#include <asm/io.h>
#include <i2c.h>
static struct udevice *tps6586x_dev;
enum {
/* Registers that we access */
SUPPLY_CONTROL1 = 0x20,
SUPPLY_CONTROL2,
SM1_VOLTAGE_V1 = 0x23,
SM1_VOLTAGE_V2,
SM0_VOLTAGE_V1 = 0x26,
SM0_VOLTAGE_V2,
PFM_MODE = 0x47,
/* Bits in the supply control registers */
CTRL_SM1_RAMP = 0x01,
CTRL_SM1_SUPPLY2 = 0x02,
CTRL_SM0_RAMP = 0x04,
CTRL_SM0_SUPPLY2 = 0x08,
};
#define MAX_I2C_RETRY 3
static int tps6586x_read(int reg)
{
int i;
uchar data;
int retval = -1;
for (i = 0; i < MAX_I2C_RETRY; ++i) {
if (!dm_i2c_read(tps6586x_dev, reg, &data, 1)) {
retval = (int)data;
goto exit;
}
/* i2c access failed, retry */
udelay(100);
}
exit:
debug("pmu_read %x=%x\n", reg, retval);
if (retval < 0)
debug("%s: failed to read register %#x: %d\n", __func__, reg,
retval);
return retval;
}
static int tps6586x_write(int reg, uchar *data, uint len)
{
int i;
int retval = -1;
for (i = 0; i < MAX_I2C_RETRY; ++i) {
if (!dm_i2c_write(tps6586x_dev, reg, data, len)) {
retval = 0;
goto exit;
}
/* i2c access failed, retry */
udelay(100);
}
exit:
debug("pmu_write %x=%x: ", reg, retval);
for (i = 0; i < len; i++)
debug("%x ", data[i]);
if (retval)
debug("%s: failed to write register %#x\n", __func__, reg);
return retval;
}
/*
* Get current voltage of SM0 and SM1
*
* @param sm0 Place to put SM0 voltage
* @param sm1 Place to put SM1 voltage
* @return 0 if ok, -1 on error
*/
static int read_voltages(int *sm0, int *sm1)
{
int ctrl1, ctrl2;
int is_v2;
/*
* Each vdd has two supply sources, ie, v1 and v2.
* The supply control reg1 and reg2 determine the current selection.
*/
ctrl1 = tps6586x_read(SUPPLY_CONTROL1);
ctrl2 = tps6586x_read(SUPPLY_CONTROL2);
if (ctrl1 == -1 || ctrl2 == -1)
return -ENOTSUPP;
/* Figure out whether V1 or V2 is selected */
is_v2 = (ctrl1 | ctrl2) & CTRL_SM0_SUPPLY2;
*sm0 = tps6586x_read(is_v2 ? SM0_VOLTAGE_V2 : SM0_VOLTAGE_V1);
*sm1 = tps6586x_read(is_v2 ? SM1_VOLTAGE_V2 : SM1_VOLTAGE_V1);
if (*sm0 == -1 || *sm1 == -1)
return -ENOTSUPP;
return 0;
}
static int set_voltage(int reg, int data, int rate)
{
uchar control_bit;
uchar buff[3];
control_bit = (reg == SM0_VOLTAGE_V1 ? CTRL_SM0_RAMP : CTRL_SM1_RAMP);
/*
* Only one supply is needed in u-boot. set both v1 and v2 to
* same value.
*
* When both v1 and v2 are set to same value, we just need to set
* control1 reg to trigger the supply selection.
*/
buff[0] = buff[1] = (uchar)data;
buff[2] = rate;
/* write v1, v2 and rate, then trigger */
if (tps6586x_write(reg, buff, 3) ||
tps6586x_write(SUPPLY_CONTROL1, &control_bit, 1))
return -ENOTSUPP;
return 0;
}
static int calculate_next_voltage(int voltage, int target, int step)
{
int diff = voltage < target ? step : -step;
if (abs(target - voltage) > step)
voltage += diff;
else
voltage = target;
return voltage;
}
int tps6586x_set_pwm_mode(int mask)
{
uchar val;
int ret;
assert(tps6586x_dev);
ret = tps6586x_read(PFM_MODE);
if (ret != -1) {
val = (uchar)ret;
val |= mask;
ret = tps6586x_write(PFM_MODE, &val, 1);
}
if (ret == -1)
debug("%s: Failed to read/write PWM mode reg\n", __func__);
return ret;
}
int tps6586x_adjust_sm0_sm1(int sm0_target, int sm1_target, int step, int rate,
int min_sm0_over_sm1)
{
int sm0, sm1;
int bad;
assert(tps6586x_dev);
/* get current voltage settings */
if (read_voltages(&sm0, &sm1)) {
debug("%s: Cannot read voltage settings\n", __func__);
return -EINVAL;
}
/*
* if vdd_core < vdd_cpu + rel
* skip
*
* This condition may happen when system reboots due to kernel crash.
*/
if (min_sm0_over_sm1 != -1 && sm0 < sm1 + min_sm0_over_sm1) {
debug("%s: SM0 is %d, SM1 is %d, but min_sm0_over_sm1 is %d\n",
__func__, sm0, sm1, min_sm0_over_sm1);
return -EINVAL;
}
/*
* Since vdd_core and vdd_cpu may both stand at either greater or less
* than their nominal voltage, the adjustment may go either directions.
*
* Make sure vdd_core is always higher than vdd_cpu with certain margin.
* So, find out which vdd to adjust first in each step.
*
* case 1: both sm0 and sm1 need to move up
* adjust sm0 before sm1
*
* case 2: both sm0 and sm1 need to move down
* adjust sm1 before sm0
*
* case 3: sm0 moves down and sm1 moves up
* adjusting either one first is fine.
*
* Adjust vdd_core and vdd_cpu one step at a time until they reach
* their nominal values.
*/
bad = 0;
while (!bad && (sm0 != sm0_target || sm1 != sm1_target)) {
int adjust_sm0_late = 0; /* flag to adjust vdd_core later */
debug("%d-%d %d-%d ", sm0, sm0_target, sm1, sm1_target);
if (sm0 != sm0_target) {
/*
* if case 1 and case 3, set new sm0 first.
* otherwise, hold down until new sm1 is set.
*/
sm0 = calculate_next_voltage(sm0, sm0_target, step);
if (sm1 < sm1_target)
bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
else
adjust_sm0_late = 1;
}
if (sm1 != sm1_target) {
sm1 = calculate_next_voltage(sm1, sm1_target, step);
bad |= set_voltage(SM1_VOLTAGE_V1, sm1, rate);
}
if (adjust_sm0_late)
bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
debug("%d\n", adjust_sm0_late);
}
debug("%d-%d %d-%d done\n", sm0, sm0_target, sm1, sm1_target);
return bad ? -EINVAL : 0;
}
int tps6586x_init(struct udevice *dev)
{
tps6586x_dev = dev;
return 0;
}
|
