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
|
/*
* 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 <boardid.h>
#include <delay.h>
#include <device/device.h>
#include <device/i2c.h>
#include <gpio.h>
#include <soc/clock.h>
#include <soc/display.h>
#include <soc/emmc.h>
#include <soc/grf.h>
#include <soc/i2c.h>
static void configure_emmc(void)
{
/* Host controller does not support programmable clock generator.
* If we don't do this setting, when we use phy to control the
* emmc clock(when clock exceed 50MHz), it will get wrong clock.
*
* Refer to TRM V0.3 Part 1 Chapter 15 PAGE 782 for this register.
* Please search "_CON11[7:0]" to locate register description.
*/
write32(&rk3399_grf->emmccore_con[11], RK_CLRSETBITS(0xff, 0));
rkclk_configure_emmc();
enable_emmc_clk();
}
static void configure_sdmmc(void)
{
gpio_output(GPIO(4, D, 5), 1); /* SDMMC_PWR_EN */
gpio_output(GPIO(2, A, 2), 1); /* SDMMC_SDIO_PWR_EN */
/* SDMMC_DET_L is different on Kevin board revision 0. */
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_KEVIN) && (board_id() == 0))
gpio_input(GPIO(4, D, 2));
else
gpio_input(GPIO(4, D, 0));
gpio_output(GPIO(2, D, 4), 0); /* Keep the max voltage */
/*
* The SD card on this board is connected to port SDMMC0, which is
* multiplexed with GPIO4B pins 0..5.
*
* Disable all pullups on these pins. For pullup configuration
* register layout stacks banks 2 through 4 together, hence [2] means
* group 4, [1] means bank B. This register is described on page 342
* of section 1 of the TRM.
*
* Each GPIO pin's pull config takes two bits, writing zero to the
* field disables pull ups/downs, as described on page 342 of rk3399
* TRM Version 0.3 Part 1.
*/
write32(&rk3399_grf->gpio2_p[2][1], RK_CLRSETBITS(0xfff, 0));
/*
* Set all outputs' drive strength to 8 mA. Group 4 bank B driver
* strength requires three bits per pin. Value of 2 written in that
* three bit field means '8 mA', as deduced from the kernel code.
*
* Thus the six pins involved in SDMMC interface require 18 bits to
* configure drive strength, but each 32 bit register provides only 16
* bits for this setting, this covers 5 pins fully and one bit from
* the 6th pin. Two more bits spill over to the next register. This is
* described on page 378 of rk3399 TRM Version 0.3 Part 1.
*/
write32(&rk3399_grf->gpio4b_e01,
RK_CLRSETBITS(0xffff,
(2 << 0) | (2 << 3) |
(2 << 6) | (2 << 9) | (2 << 12)));
write32(&rk3399_grf->gpio4b_e2, RK_CLRSETBITS(3, 1));
/* And now set the multiplexor to enable SDMMC0. */
write32(&rk3399_grf->iomux_sdmmc, IOMUX_SDMMC);
}
static void configure_display(void)
{
/* set pinmux for edp HPD*/
gpio_input_pulldown(GPIO(4, C, 7));
write32(&rk3399_grf->iomux_edp_hotplug, IOMUX_EDP_HOTPLUG);
gpio_output(GPIO(4, D, 3), 1); /* CPU3_EDP_VDDEN for P3.3V_DISP */
}
static void mainboard_init(device_t dev)
{
configure_sdmmc();
configure_emmc();
configure_display();
}
static void enable_backlight_booster(void)
{
const struct {
uint8_t reg;
uint8_t value;
} i2c_writes[] = {
{1, 0x84},
{1, 0x85},
{0, 0x26}
};
int i;
const int booster_i2c_port = 0;
uint8_t i2c_buf[2];
struct i2c_seg i2c_command = { .read = 0, .chip = 0x2c,
.buf = i2c_buf, .len = sizeof(i2c_buf)
};
/*
* This function is called on Gru right after BL_EN is asserted. It
* takes time for the switcher chip to come online, let's wait a bit
* to let the voltage settle, so that the chip can be accessed.
*/
udelay(1000);
/* Select pinmux for i2c0, which is the display backlight booster. */
write32(&rk3399_pmugrf->iomux_i2c0_sda, IOMUX_I2C0_SDA);
write32(&rk3399_pmugrf->iomux_i2c0_scl, IOMUX_I2C0_SCL);
i2c_init(0, 100*KHz);
for (i = 0; i < ARRAY_SIZE(i2c_writes); i++) {
i2c_buf[0] = i2c_writes[i].reg;
i2c_buf[1] = i2c_writes[i].value;
i2c_transfer(booster_i2c_port, &i2c_command, 1);
}
}
void mainboard_power_on_backlight(void)
{
gpio_output(GPIO(1, C, 1), 1); /* BL_EN */
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_GRU))
enable_backlight_booster();
}
static void mainboard_enable(device_t dev)
{
dev->ops->init = &mainboard_init;
}
struct chip_operations mainboard_ops = {
.name = CONFIG_MAINBOARD_PART_NUMBER,
.enable_dev = mainboard_enable,
};
|
