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
|
/*
* This file is part of the coreboot project.
*
* Copyright 2016 Rockchip Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/io.h>
#include <assert.h>
#include <boardid.h>
#include <console/console.h>
#include <gpio.h>
#include <soc/grf.h>
#include <soc/pwm.h>
#include "pwm_regulator.h"
/*
* Apparently a period of 3333 is determined by EEs to be ideal for our
* board design / resistors / capacitors / regulators but due to
* clock dividers we actually get 3337.
*/
#define PWM_PERIOD 3337
#define PWM_DESIGN_VOLTAGE_MIN_OUTDATED 8000
#define PWM_DESIGN_VOLTAGE_MAX_OUTDATED 15000
/* Later boards (Kevin rev6+, Gru rev2+) use different regulator ranges. */
int kevin6_pwm_design_voltage[][2] = {
[PWM_REGULATOR_GPU] = {7858, 12177},
[PWM_REGULATOR_BIG] = {7987, 13022},
[PWM_REGULATOR_LIT] = {7991, 13037},
[PWM_REGULATOR_CENTERLOG] = {8001, 10497}
};
int pwm_design_voltage[][2] = {
[PWM_REGULATOR_GPU] = {7864, 12177},
[PWM_REGULATOR_BIG] = {8001, 13022},
[PWM_REGULATOR_LIT] = {7977, 13078},
[PWM_REGULATOR_CENTERLOG] = {7994, 10499}
};
int pwm_enum_to_pwm_number[] = {
[PWM_REGULATOR_GPU] = 0,
[PWM_REGULATOR_LIT] = 2,
#if IS_ENABLED(CONFIG_BOARD_GOOGLE_SCARLET)
[PWM_REGULATOR_BIG] = 3,
[PWM_REGULATOR_CENTERLOG] = -1, /* fixed regulator on Scarlet */
#else
[PWM_REGULATOR_BIG] = 1,
[PWM_REGULATOR_CENTERLOG] = 3,
#endif
};
void pwm_regulator_configure(enum pwm_regulator pwm, int millivolt)
{
int duty_ns, voltage_max, voltage_min;
int voltage = millivolt * 10; /* for higer calculation accuracy */
int pwm_number = pwm_enum_to_pwm_number[pwm];
voltage_min = pwm_design_voltage[pwm][0];
voltage_max = pwm_design_voltage[pwm][1];
if ((IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN) && board_id() < 6) ||
(IS_ENABLED(CONFIG_BOARD_GOOGLE_GRU) && board_id() < 2)) {
voltage_min = PWM_DESIGN_VOLTAGE_MIN_OUTDATED;
voltage_max = PWM_DESIGN_VOLTAGE_MAX_OUTDATED;
} else if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN) && board_id() >= 6) {
voltage_min = kevin6_pwm_design_voltage[pwm][0];
voltage_max = kevin6_pwm_design_voltage[pwm][1];
}
assert(voltage <= voltage_max && voltage >= voltage_min);
/*
* Intentionally round down (higher volt) to be safe.
* eg, for the default min & max design voltage:
* period = 3337, volt = 1.1: 1906
* period = 3337, volt = 1.0: 2383
* period = 3337, volt = 0.9: 2860
*/
duty_ns = PWM_PERIOD * (voltage_max - voltage)
/ (voltage_max - voltage_min);
pwm_init(pwm_number, PWM_PERIOD, duty_ns);
switch (pwm_number) {
case 0:
gpio_input(GPIO(4, C, 2)); /* PWM0 remove pull-down */
write32(&rk3399_grf->iomux_pwm_0, IOMUX_PWM_0);
break;
case 1:
gpio_input(GPIO(4, C, 6)); /* PWM1 remove pull-down */
write32(&rk3399_grf->iomux_pwm_1, IOMUX_PWM_1);
break;
case 2:
gpio_input(GPIO(1, C, 3)); /* PWM2 remove pull-down */
write32(&rk3399_pmugrf->iomux_pwm_2, IOMUX_PWM_2);
break;
case 3:
gpio_input(GPIO(0, A, 6)); /* PWM3 remove pull-down */
write32(&rk3399_pmugrf->iomux_pwm_3a, IOMUX_PWM_3_A);
break;
default:
die("incorrect board configuration");
}
}
|
