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/* 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)
#define I2C_FULL_DUTY 100
#define I2C_HALF_DUTY 50
#define I2C_ADJUSTED_DUTY 50
#define I2C_FS_START_CON 0x0
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,
},
};
#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(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);
}
}
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;
uint32_t tar_speed = 400;
uint32_t tar_speed_high;
uint32_t tar_speed_low;
assert(bus < I2C_BUS_NUMBER);
/* Adjust ratio of high/low level */
tar_speed_high = tar_speed * I2C_HALF_DUTY / I2C_ADJUSTED_DUTY;
/* Calculate i2c frequency */
step_div = DIV_ROUND_UP(I2C_CLK_HZ,
(tar_speed_high * 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 <= tar_speed_high * KHz &&
i2c_freq >= (tar_speed_high - 20) * KHz);
/* Init i2c bus timing register */
write32(&mtk_i2c_bus_controller[bus].i2c_regs->timing,
(sample_div - 1) << 8 | (step_div - 1));
/* Adjust ratio of high/low level */
tar_speed_low = tar_speed * I2C_HALF_DUTY /
(I2C_FULL_DUTY - I2C_ADJUSTED_DUTY);
/* Calculate i2c frequency */
step_div = DIV_ROUND_UP(I2C_CLK_HZ,
(tar_speed_low * 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 <= tar_speed_low * KHz &&
i2c_freq >= (tar_speed_low - 20) * KHz);
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);
/* Adjust tSU,STA/tHD,STA/tSU,STO */
write32(&mtk_i2c_bus_controller[bus].i2c_regs->ext_conf, I2C_FS_START_CON);
}
void mtk_i2c_bus_init(uint8_t bus)
{
mtk_i2c_speed_init(bus);
mtk_i2c_set_gpio_pinmux(bus);
}
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