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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google, 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <device/i2c.h>
#include <gpio.h>
#include <soc/pinmux.h>
#include "i2c.h"
static struct {
int pinmux_func;
gpio_t sda;
gpio_t scl;
} pins[] = {
[0]{.pinmux_func = PINMUX_GEN1_I2C_SCL_FUNC_I2C1,
.sda = GPIO(C5), .scl = GPIO(C4)},
[1]{.pinmux_func = PINMUX_GEN2_I2C_SCL_FUNC_I2C2,
.sda = GPIO(T6), .scl = GPIO(T5)},
[2]{.pinmux_func = PINMUX_CAM_I2C_SCL_FUNC_I2C3,
.sda = GPIO(BB2), .scl = GPIO(BB1)},
[3]{.pinmux_func = PINMUX_DDC_SCL_FUNC_I2C4,
.sda = GPIO(V5), .scl = GPIO(V4)},
[4]{.pinmux_func = PINMUX_PWR_I2C_SCL_FUNC_I2CPMU,
.sda = GPIO(Z7), .scl = GPIO(Z6)},
};
static void tegra_set_sda(unsigned bus, int high)
{
if (high)
gpio_input_pullup(pins[bus].sda);
else
gpio_output(pins[bus].sda, 0);
}
static void tegra_set_scl(unsigned bus, int high)
{
if (high)
gpio_input_pullup(pins[bus].scl);
else
gpio_output(pins[bus].scl, 0);
}
static int tegra_get_sda(unsigned bus)
{
return gpio_get(pins[bus].sda);
}
static int tegra_get_scl(unsigned bus)
{
return gpio_get(pins[bus].scl);
}
static struct software_i2c_ops tegra_ops = {
.set_sda = tegra_set_sda,
.set_scl = tegra_set_scl,
.get_sda = tegra_get_sda,
.get_scl = tegra_get_scl,
};
void tegra_software_i2c_init(unsigned bus)
{
software_i2c[bus] = &tegra_ops;
/* Initialize bus to idle state. */
tegra_set_sda(bus, 1);
tegra_set_scl(bus, 1);
}
void tegra_software_i2c_disable(unsigned bus)
{
software_i2c[bus] = NULL;
/* Return pins to I2C controller. */
pinmux_set_config(pins[bus].sda >> GPIO_PINMUX_SHIFT,
pins[bus].pinmux_func | PINMUX_INPUT_ENABLE);
pinmux_set_config(pins[bus].scl >> GPIO_PINMUX_SHIFT,
pins[bus].pinmux_func | PINMUX_INPUT_ENABLE);
gpio_set_mode(pins[bus].sda, GPIO_MODE_SPIO);
gpio_set_mode(pins[bus].scl, GPIO_MODE_SPIO);
}
|
