1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <assert.h>
4 #include <console/console.h>
5 #include <device/mmio.h>
6 #include <gpio.h>
7 #include <soc/i2c.h>
8
9 #define I2C_FULL_DUTY 100
10 #define I2C_HALF_DUTY 50
11 #define I2C_ADJUSTED_DUTY 45
12 #define I2C_FS_START_CON 0x601
13 struct mtk_i2c mtk_i2c_bus_controller[] = {
14 [0] = {
15 .i2c_regs = (void *)(I2C_BASE + 0x250000),
16 .i2c_dma_regs = (void *)(I2C_DMA_BASE),
17 .mt_i2c_flag = I2C_APDMA_ASYNC,
18 },
19 [1] = {
20 .i2c_regs = (void *)(I2C_BASE + 0x70000),
21 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x80),
22 .mt_i2c_flag = I2C_APDMA_ASYNC,
23 },
24 [2] = {
25 .i2c_regs = (void *)(I2C_BASE + 0x71000),
26 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x100),
27 .mt_i2c_flag = I2C_APDMA_ASYNC,
28 },
29 [3] = {
30 .i2c_regs = (void *)(I2C_BASE),
31 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x280),
32 .mt_i2c_flag = I2C_APDMA_ASYNC,
33 },
34 [4] = {
35 .i2c_regs = (void *)(I2C_BASE + 0x72000),
36 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x300),
37 .mt_i2c_flag = I2C_APDMA_ASYNC,
38 },
39 [5] = {
40 .i2c_regs = (void *)(I2C_BASE + 0x150000),
41 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x480),
42 .mt_i2c_flag = I2C_APDMA_ASYNC,
43 },
44 [6] = {
45 .i2c_regs = (void *)(I2C_BASE + 0x251000),
46 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x500),
47 .mt_i2c_flag = I2C_APDMA_ASYNC,
48 },
49 [7] = {
50 .i2c_regs = (void *)(I2C_BASE + 0x50000),
51 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x580),
52 .mt_i2c_flag = I2C_APDMA_ASYNC,
53 },
54 [8] = {
55 .i2c_regs = (void *)(I2C_BASE + 0x51000),
56 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x700),
57 .mt_i2c_flag = I2C_APDMA_ASYNC,
58 },
59 [9] = {
60 .i2c_regs = (void *)(I2C_BASE + 0x52000),
61 .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x880),
62 .mt_i2c_flag = I2C_APDMA_ASYNC,
63 },
64 };
65
66 _Static_assert(ARRAY_SIZE(mtk_i2c_bus_controller) == I2C_BUS_NUMBER,
67 "Wrong size of mtk_i2c_bus_controller");
68
69 struct pad_func {
70 gpio_t gpio;
71 u8 func;
72 };
73
74 #define PAD_FUNC(name, func) {GPIO(name), PAD_##name##_FUNC_##func}
75
76 static const struct pad_func i2c_funcs[I2C_BUS_NUMBER][2] = {
77 [0] = {
78 PAD_FUNC(SDA0, SDA0),
79 PAD_FUNC(SCL0, SCL0),
80 },
81 [1] = {
82 PAD_FUNC(SDA1, SDA1),
83 PAD_FUNC(SCL1, SCL1),
84 },
85 [2] = {
86 PAD_FUNC(SDA2, SDA2),
87 PAD_FUNC(SCL2, SCL2),
88 },
89 [3] = {
90 PAD_FUNC(SDA3, SDA3),
91 PAD_FUNC(SCL3, SCL3),
92 },
93 [4] = {
94 PAD_FUNC(SDA4, SDA4),
95 PAD_FUNC(SCL4, SCL4),
96 },
97 [5] = {
98 PAD_FUNC(SDA5, SDA5),
99 PAD_FUNC(SCL5, SCL5),
100 },
101 [6] = {
102 PAD_FUNC(SDA6, SDA6),
103 PAD_FUNC(SCL6, SCL6),
104 },
105 [7] = {
106 PAD_FUNC(SDA7, SDA7),
107 PAD_FUNC(SCL7, SCL7),
108 },
109 [8] = {
110 PAD_FUNC(SDA8, SDA8),
111 PAD_FUNC(SCL8, SCL8),
112 },
113 [9] = {
114 PAD_FUNC(SDA9, SDA9),
115 PAD_FUNC(SCL9, SCL9),
116 },
117 };
118
mtk_i2c_set_gpio_pinmux(uint8_t bus)119 static void mtk_i2c_set_gpio_pinmux(uint8_t bus)
120 {
121 assert(bus < I2C_BUS_NUMBER);
122
123 const struct pad_func *ptr = i2c_funcs[bus];
124 for (size_t i = 0; i < 2; i++) {
125 gpio_set_mode(ptr[i].gpio, ptr[i].func);
126 gpio_set_pull(ptr[i].gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP);
127 }
128 }
129
mtk_i2c_speed_init_soc(uint8_t bus)130 static void mtk_i2c_speed_init_soc(uint8_t bus)
131 {
132 uint8_t step_div;
133 const uint8_t clock_div = 5;
134 const uint8_t sample_div = 1;
135 uint32_t i2c_freq;
136 uint32_t tar_speed = 400;
137 uint32_t tar_speed_high;
138 uint32_t tar_speed_low;
139
140 assert(bus < I2C_BUS_NUMBER);
141
142 /* Adjust ratio of high/low level */
143 tar_speed_high = tar_speed * I2C_HALF_DUTY / I2C_ADJUSTED_DUTY;
144
145 /* Calculate i2c frequency */
146 step_div = DIV_ROUND_UP(I2C_CLK_HZ,
147 (tar_speed_high * KHz * sample_div * 2) * clock_div);
148 i2c_freq = I2C_CLK_HZ / (step_div * sample_div * 2 * clock_div);
149 assert(sample_div < 8 && step_div < 64 &&
150 i2c_freq <= tar_speed_high * KHz &&
151 i2c_freq >= (tar_speed_high - 20) * KHz);
152
153 /* Init i2c bus timing register */
154 write32(&mtk_i2c_bus_controller[bus].i2c_regs->timing,
155 (sample_div - 1) << 8 | (step_div - 1));
156
157 /* Adjust ratio of high/low level */
158 tar_speed_low = tar_speed * I2C_HALF_DUTY /
159 (I2C_FULL_DUTY - I2C_ADJUSTED_DUTY);
160
161 /* Calculate i2c frequency */
162 step_div = DIV_ROUND_UP(I2C_CLK_HZ,
163 (tar_speed_low * KHz * sample_div * 2) * clock_div);
164 i2c_freq = I2C_CLK_HZ / (step_div * sample_div * 2 * clock_div);
165 assert(sample_div < 8 && step_div < 64 &&
166 i2c_freq <= tar_speed_low * KHz &&
167 i2c_freq >= (tar_speed_low - 20) * KHz);
168 write32(&mtk_i2c_bus_controller[bus].i2c_regs->ltiming,
169 (sample_div - 1) << 6 | (step_div - 1));
170
171 /* Init i2c bus clock_div register */
172 write32(&mtk_i2c_bus_controller[bus].i2c_regs->clock_div,
173 clock_div - 1);
174
175 /* Adjust tSU,STA/tHD,STA/tSU,STO */
176 write32(&mtk_i2c_bus_controller[bus].i2c_regs->ext_conf, I2C_FS_START_CON);
177 }
178
mtk_i2c_bus_init(uint8_t bus)179 void mtk_i2c_bus_init(uint8_t bus)
180 {
181 mtk_i2c_speed_init_soc(bus);
182 mtk_i2c_set_gpio_pinmux(bus);
183 }
184
mtk_i2c_dump_more_info(struct mt_i2c_regs * regs)185 void mtk_i2c_dump_more_info(struct mt_i2c_regs *regs)
186 {
187 printk(BIOS_DEBUG, "LTIMING %x\nCLK_DIV %x\n",
188 read32(®s->ltiming),
189 read32(®s->clock_div));
190 }
191