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/*
* This file is part of the coreboot project.
*
* Copyright 2015 MediaTek Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef SOC_MEDIATEK_MT8173_I2C_H
#define SOC_MEDIATEK_MT8173_I2C_H
#include <stddef.h>
/* I2C Configuration */
enum {
I2C_HS_DEFAULT_VALUE = 0x0102,
};
enum i2c_modes {
I2C_WRITE_MODE = 0,
I2C_READ_MODE = 1,
I2C_WRITE_READ_MODE = 2,
};
enum {
I2C_DMA_CON_TX = 0x0,
I2C_DMA_CON_RX = 0x1,
I2C_DMA_START_EN = 0x1,
I2C_DMA_INT_FLAG_NONE = 0x0,
I2C_DMA_CLR_FLAG = 0x0,
I2C_DMA_FLUSH_FLAG = 0x1,
};
/* I2C DMA Registers */
struct mt8173_i2c_dma_regs {
uint32_t dma_int_flag;
uint32_t dma_int_en;
uint32_t dma_en;
uint32_t dma_rst;
uint32_t reserved1;
uint32_t dma_flush;
uint32_t dma_con;
uint32_t dma_tx_mem_addr;
uint32_t dma_rx_mem_addr;
uint32_t dma_tx_len;
uint32_t dma_rx_len;
};
check_member(mt8173_i2c_dma_regs, dma_tx_len, 0x24);
/* I2C Register */
struct mt8173_i2c_regs {
uint32_t data_port;
uint32_t slave_addr;
uint32_t intr_mask;
uint32_t intr_stat;
uint32_t control;
uint32_t transfer_len;
uint32_t transac_len;
uint32_t delay_len;
uint32_t timing;
uint32_t start;
uint32_t ext_conf;
uint32_t reserved1;
uint32_t fifo_stat;
uint32_t fifo_thresh;
uint32_t fifo_addr_clr;
uint32_t reserved2;
uint32_t io_config;
uint32_t debug;
uint32_t hs;
uint32_t reserved3;
uint32_t softreset;
uint32_t dcm;
uint32_t reserved4[3];
uint32_t debug_stat;
uint32_t debug_ctrl;
uint32_t transfer_aux_len;
};
check_member(mt8173_i2c_regs, debug_stat, 0x64);
struct mtk_i2c {
struct mt8173_i2c_regs *i2c_regs;
struct mt8173_i2c_dma_regs *i2c_dma_regs;
};
enum {
I2C_TRANS_LEN_MASK = (0xff),
I2C_TRANS_AUX_LEN_MASK = (0x1f << 8),
I2C_CONTROL_MASK = (0x3f << 1)
};
/* Register mask */
enum {
I2C_HS_NACKERR = (1 << 2),
I2C_ACKERR = (1 << 1),
I2C_TRANSAC_COMP = (1 << 0),
};
/* i2c control bits */
enum {
ACK_ERR_DET_EN = (1 << 5),
DIR_CHG = (1 << 4),
CLK_EXT = (1 << 3),
DMA_EN = (1 << 2),
REPEATED_START_FLAG = (1 << 1),
STOP_FLAG = (0 << 1)
};
/* I2C Status Code */
enum {
I2C_OK = 0x0000,
I2C_SET_SPEED_FAIL_OVER_SPEED = 0xA001,
I2C_TRANSFER_INVALID_LENGTH = 0xA002,
I2C_TRANSFER_FAIL_HS_NACKERR = 0xA003,
I2C_TRANSFER_FAIL_ACKERR = 0xA004,
I2C_TRANSFER_FAIL_TIMEOUT = 0xA005,
I2C_TRANSFER_INVALID_ARGUMENT = 0xA006
};
void mtk_i2c_bus_init(uint8_t bus);
#endif /* SOC_MEDIATEK_MT8173_I2C_H */