| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <assert.h> |
| #include <console/console.h> |
| #include <device/mmio.h> |
| #include <soc/i2c.h> |
| #include <soc/gpio.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)); |
| } |