i23c_pad_ctrl.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/acpimmio.h>
#include <amdblocks/i2c.h>
#include <console/console.h>
#include <types.h>
#include "i23c_pad_def.h"
 
void fch_i23c_pad_init(unsigned int bus,
                       enum i2c_speed speed,
                       const struct i2c_pad_control *ctrl)
{
        uint32_t pad_ctrl;
 
        pad_ctrl = misc_read32(MISC_I23C_PAD_CTRL(bus));
 
        pad_ctrl &= ~I23C_PAD_CTRL_MODE_I3C_I2C_MASK;
        pad_ctrl |= I23C_PAD_CTRL_MODE_I2C;
 
        switch (ctrl->rx_level) {
        case I2C_PAD_RX_NO_CHANGE:
                /* Default is enabled and thresholds for 1.8V operation */
                break;
        case I2C_PAD_RX_OFF:
                pad_ctrl &= ~I23C_PAD_CTRL_RX_SEL_MASK;
                pad_ctrl |= I23C_PAD_CTRL_RX_SEL_OFF;
                pad_ctrl &= ~I23C_PAD_CTRL_MODE_1_8V_1_1V_MASK;
                pad_ctrl |= I23C_PAD_CTRL_MODE_1_8V;
                break;
        case I2C_PAD_RX_1_8V:
                pad_ctrl &= ~I23C_PAD_CTRL_RX_SEL_MASK;
                pad_ctrl |= I23C_PAD_CTRL_RX_SEL_ON;
                pad_ctrl &= ~I23C_PAD_CTRL_MODE_1_8V_1_1V_MASK;
                pad_ctrl |= I23C_PAD_CTRL_MODE_1_8V;
                break;
        case I2C_PAD_RX_1_1V:
                pad_ctrl &= ~I23C_PAD_CTRL_RX_SEL_MASK;
                pad_ctrl |= I23C_PAD_CTRL_RX_SEL_ON;
                pad_ctrl &= ~I23C_PAD_CTRL_MODE_1_8V_1_1V_MASK;
                pad_ctrl |= I23C_PAD_CTRL_MODE_1_1V;
                break;
        default:
                printk(BIOS_WARNING, "Invalid I2C/I3C pad RX level for bus %u\n", bus);
                break;
        }
 
        misc_write32(MISC_I23C_PAD_CTRL(bus), pad_ctrl);
}