i2c.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
/*
 * This file is created based on MT8186 Functional Specification
 * Chapter number: 5.10
 */
 
#include <assert.h>
#include <console/console.h>
#include <device/mmio.h>
#include <device/i2c_simple.h>
#include <soc/i2c.h>
#include <soc/gpio.h>
 
struct mtk_i2c mtk_i2c_bus_controller[] = {
        [0] = {
                .i2c_regs = (void *)(I2C0_BASE),
                .i2c_dma_regs = (void *)(I2C0_DMA_BASE),
        },
        [1] = {
                .i2c_regs = (void *)(I2C1_BASE),
                .i2c_dma_regs = (void *)(I2C1_DMA_BASE),
        },
        [2] = {
                .i2c_regs = (void *)(I2C2_BASE),
                .i2c_dma_regs = (void *)(I2C2_DMA_BASE),
        },
        [3] = {
                .i2c_regs = (void *)(I2C3_BASE),
                .i2c_dma_regs = (void *)(I2C3_DMA_BASE),
        },
        [4] = {
                .i2c_regs = (void *)(I2C4_BASE),
                .i2c_dma_regs = (void *)(I2C4_DMA_BASE),
        },
        [5] = {
                .i2c_regs = (void *)(I2C5_BASE),
                .i2c_dma_regs = (void *)(I2C5_DMA_BASE),
        },
        [6] = {
                .i2c_regs = (void *)(I2C6_BASE),
                .i2c_dma_regs = (void *)(I2C6_DMA_BASE),
        },
        [7] = {
                .i2c_regs = (void *)(I2C7_BASE),
                .i2c_dma_regs = (void *)(I2C7_DMA_BASE),
        },
        [8] = {
                .i2c_regs = (void *)(I2C8_BASE),
                .i2c_dma_regs = (void *)(I2C8_DMA_BASE),
        },
        [9] = {
                .i2c_regs = (void *)(I2C9_BASE),
                .i2c_dma_regs = (void *)(I2C9_DMA_BASE),
        },
};
 
_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);
        }
}
 
void mtk_i2c_bus_init(uint8_t bus, uint32_t speed)
{
        mtk_i2c_speed_init(bus, speed);
        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(&regs->ltiming),
               read32(&regs->clock_div));
}
 
void mtk_i2c_config_timing(struct mt_i2c_regs *regs, struct mtk_i2c *bus_ctrl)
{
        write32(&regs->clock_div, bus_ctrl->ac_timing.inter_clk_div);
        write32(&regs->timing, bus_ctrl->ac_timing.htiming);
        write32(&regs->ltiming, bus_ctrl->ac_timing.ltiming);
        write32(&regs->hs, bus_ctrl->ac_timing.hs);
        write32(&regs->ext_conf, bus_ctrl->ac_timing.ext);
}