diff options
Diffstat (limited to 'src/soc/mediatek/mt8192/i2c.c')
-rw-r--r-- | src/soc/mediatek/mt8192/i2c.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8192/i2c.c b/src/soc/mediatek/mt8192/i2c.c new file mode 100644 index 0000000000..e38cbb617d --- /dev/null +++ b/src/soc/mediatek/mt8192/i2c.c @@ -0,0 +1,157 @@ +/* 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); +} |