/* SPDX-License-Identifier: GPL-2.0-only */ #include <assert.h> #include <device/mmio.h> #include <soc/i2c.h> #include <soc/gpio.h> #define I2C_FULL_DUTY 100 #define I2C_HALF_DUTY 50 #define I2C_ADJUSTED_DUTY 45 #define I2C_FS_START_CON 0x601 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, }, }; _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(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_soc(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_soc(bus); 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(®s->ltiming), read32(®s->clock_div)); }