/* SPDX-License-Identifier: GPL-2.0-only */ #include <assert.h> #include <console/console.h> #include <device/mmio.h> #include <gpio.h> #include <soc/i2c.h> struct mtk_i2c mtk_i2c_bus_controller[] = { /* i2c0 setting */ { .i2c_regs = (void *)(I2C_BASE + 0x2000), .i2c_dma_regs = (void *)(I2C_DMA_BASE), }, /* i2c1 setting */ { .i2c_regs = (void *)(I2C_BASE + 0xc000), .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x400), }, /* i2c2 setting */ { .i2c_regs = (void *)(I2C_BASE + 0x4000), .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x200), }, /* i2c3 setting */ { .i2c_regs = (void *)(I2C_BASE + 0xa000), .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x380), }, /* i2c4 setting */ { .i2c_regs = (void *)(I2C_BASE + 0x3000), .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x80), }, /* i2c5 setting */ { .i2c_regs = (void *)(I2C_BASE + 0x11000), .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x480), }, /* i2c6 setting */ { .i2c_regs = (void *)(I2C_BASE), .i2c_dma_regs = (void *)(I2C_DMA_BASE + 0x580), }, }; _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] = { { PAD_FUNC(SDA0, SDA0), PAD_FUNC(SCL0, SCL0), }, { PAD_FUNC(SDA1, SDA1), PAD_FUNC(SCL1, SCL1), }, { PAD_FUNC(SDA2, SDA2), PAD_FUNC(SCL2, SCL2), }, { PAD_FUNC(SDA3, SDA3), PAD_FUNC(SCL3, SCL3), }, { PAD_FUNC(SDA4, SDA4), PAD_FUNC(SCL4, SCL4), }, { PAD_FUNC(SDA5, SDA5), PAD_FUNC(SCL5, SCL5), }, { PAD_FUNC(SDA6, SDA6), PAD_FUNC(SCL6, SCL6), }, }; 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; assert(bus < ARRAY_SIZE(mtk_i2c_bus_controller)); /* 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_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)); }