| /* 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) |
| 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, |
| }, |
| }; |
| |
| #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(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(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 < I2C_BUS_NUMBER); |
| |
| /* 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(bus); |
| mtk_i2c_set_gpio_pinmux(bus); |
| } |