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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <device/mmio.h>
#include <soc/pll.h>
#include <soc/i2c.h>
#include <soc/gpio.h>
#define I2C_CLK_HZ (UNIVPLL_HZ / 20)
struct mtk_i2c mtk_i2c_bus_controller[] = {
[0] = {
.i2c_regs = (void *)(I2C_BASE + 0x250000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[1] = {
.i2c_regs = (void *)(I2C_BASE + 0x70000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x80),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[2] = {
.i2c_regs = (void *)(I2C_BASE + 0x71000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x100),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[3] = {
.i2c_regs = (void *)(I2C_BASE),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x280),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[4] = {
.i2c_regs = (void *)(I2C_BASE + 0x72000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x300),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[5] = {
.i2c_regs = (void *)(I2C_BASE + 0x150000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x480),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[6] = {
.i2c_regs = (void *)(I2C_BASE + 0x251000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x500),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[7] = {
.i2c_regs = (void *)(I2C_BASE + 0x50000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x580),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[8] = {
.i2c_regs = (void *)(I2C_BASE + 0x51000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x700),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
[9] = {
.i2c_regs = (void *)(I2C_BASE + 0x52000),
.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x880),
.mt_i2c_flag = I2C_APDMA_ASYNC,
},
};
#define I2C_BUS_NUMBER ARRAY_SIZE(mtk_i2c_bus_controller)
struct pad_func {
gpio_t gpio;
u8 func;
};
#define PAD_FUNC(name, func) {GPIO(name), PAD_##name##_FUNC_##func}
static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
[0] = {
PAD_FUNC(SDA0, SDA0),
PAD_FUNC(SCL0, SCL0),
},
[1] = {
PAD_FUNC(SDA1, SDA1),
PAD_FUNC(SCL1, SCL1),
},
[2] = {
PAD_FUNC(SDA2, SDA2),
PAD_FUNC(SCL2, SCL2),
},
[3] = {
PAD_FUNC(SDA3, SDA3),
PAD_FUNC(SCL3, SCL3),
},
[4] = {
PAD_FUNC(SDA4, SDA4),
PAD_FUNC(SCL4, SCL4),
},
[5] = {
PAD_FUNC(SDA5, SDA5),
PAD_FUNC(SCL5, SCL5),
},
[6] = {
PAD_FUNC(SDA6, SDA6),
PAD_FUNC(SCL6, SCL6),
},
[7] = {
PAD_FUNC(SDA7, SDA7),
PAD_FUNC(SCL7, SCL7),
},
[8] = {
PAD_FUNC(SDA8, SDA8),
PAD_FUNC(SCL8, SCL8),
},
[9] = {
PAD_FUNC(SDA9, SDA9),
PAD_FUNC(SCL9, SCL9),
},
};
static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
{
assert(bus < I2C_BUS_NUMBER);
const struct pad_func *ptr = i2c_funcs[bus];
for (size_t i = 0; i < 2; i++) {
gpio_set_mode(ptr[i].gpio, ptr[i].func);
gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP);
}
}
static void mtk_i2c_speed_init(uint8_t bus)
{
uint8_t step_div;
const uint8_t clock_div = 5;
const uint8_t sample_div = 1;
uint32_t i2c_freq;
assert(bus < I2C_BUS_NUMBER);
/* Calculate i2c frequency */
step_div = DIV_ROUND_UP(I2C_CLK_HZ,
(400 * KHz * sample_div * 2) * clock_div);
i2c_freq = I2C_CLK_HZ / (step_div * sample_div * 2 * clock_div);
assert(sample_div < 8 && step_div < 64 && i2c_freq <= 400 * KHz &&
i2c_freq >= 380 * KHz);
/* Init i2c bus timing register */
write32(&mtk_i2c_bus_controller[bus].i2c_regs->timing,
(sample_div - 1) << 8 | (step_div - 1));
write32(&mtk_i2c_bus_controller[bus].i2c_regs->ltiming,
(sample_div - 1) << 6 | (step_div - 1));
/* Init i2c bus clock_div register */
write32(&mtk_i2c_bus_controller[bus].i2c_regs->clock_div,
clock_div - 1);
}
void mtk_i2c_bus_init(uint8_t bus)
{
mtk_i2c_speed_init(bus);
mtk_i2c_set_gpio_pinmux(bus);
}
|
