src/soc/mediatek/mt8195/i2c.c


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

/* SPDX-License-Identifier: GPL-2.0-only OR MIT */

#include <assert.h>
#include <console/console.h>
#include <device/mmio.h>
#include <device/i2c_simple.h>
#include <soc/i2c.h>
#include <soc/gpio.h>

struct mtk_i2c mtk_i2c_bus_controller[] = {
	[0] = {
		.i2c_regs = (void *)(I2C_BASE),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
	[1] = {
		.i2c_regs = (void *)(I2C_BASE + 0x1000),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x180),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
	[2] = {
		.i2c_regs = (void *)(I2C_BASE + 0x2000),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x300),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
	[3] = {
		.i2c_regs = (void *)(I2C_BASE + 0x3000),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x400),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
	[4] = {
		.i2c_regs = (void *)(I2C_BASE + 0x4000),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x480),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
	[5] = {
		.i2c_regs = (void *)(I2C_BASE - 0x100000),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x500),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
	[6] = {
		.i2c_regs = (void *)(I2C_BASE - 0xFF000),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x580),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
	[7] = {
		.i2c_regs = (void *)(I2C_BASE - 0xFE000),
		.i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x600),
		.mt_i2c_flag = I2C_APDMA_ASYNC,
	},
};

_Static_assert(ARRAY_SIZE(mtk_i2c_bus_controller) == I2C_BUS_NUMBER,
	       "Wrong size of 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(HDMIRX_SCL, SCL5),
		PAD_FUNC(HDMIRX_SDA, SDA5),
	},
	[6] = {
		PAD_FUNC(HDMITX_SCL, SCL6),
		PAD_FUNC(HDMITX_SDA, SDA6),
	},
	[7] = {
		PAD_FUNC(HDMIRX_HTPLG, SCL7),
		PAD_FUNC(HDMIRX_PWR5V, SDA7),
	},

};

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);
		if (bus <= I2C4)
			gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP);
	}
}

void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
{
	mtk_i2c_speed_init(bus, speed);
	mtk_i2c_set_gpio_pinmux(bus);
}

void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
{
	printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
	       read32(&regs->ltiming),
	       read32(&regs->clock_div));
}

void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
{
	write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
	write32(&regs->timing, bus_ctrl->ac_timing.htiming);
	write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
	write32(&regs->hs, bus_ctrl->ac_timing.hs);
	write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
}