arm-trusted-firmware/include/drivers/nxp/i2c/i2c.h

/*
 * Copyright 2016-2021 NXP
 *
 * SPDX-License-Identifier: BSD-3-Clause
 *
 */


#ifndef I2C_H
#define I2C_H

#include <lib/mmio.h>

#define I2C_TIMEOUT	1000	/* ms */

#define I2C_FD_CONSERV	0x7e
#define I2C_CR_DIS	(1 << 7)
#define I2C_CR_EN	(0 << 7)
#define I2C_CR_MA	(1 << 5)
#define I2C_CR_TX	(1 << 4)
#define I2C_CR_TX_NAK	(1 << 3)
#define I2C_CR_RSTA	(1 << 2)
#define I2C_SR_BB	(1 << 5)
#define I2C_SR_IDLE	(0 << 5)
#define I2C_SR_AL	(1 << 4)
#define I2C_SR_IF	(1 << 1)
#define I2C_SR_RX_NAK	(1 << 0)
#define I2C_SR_RST	(I2C_SR_AL | I2C_SR_IF)

#define I2C_GLITCH_EN	0x8

#define i2c_in(a)	mmio_read_8((uintptr_t)(a))
#define i2c_out(a, v)	mmio_write_8((uintptr_t)(a), (v))

struct ls_i2c {
	unsigned char ad;	/* I2c Bus Address Register */
	unsigned char fd;	/* I2c Bus Frequency Dividor Register */
	unsigned char cr;	/* I2c Bus Control Register */
	unsigned char sr;	/* I2c Bus Status Register */
	unsigned char dr;	/* I2C Bus Data I/O Register */
	unsigned char ic;	/* I2C Bus Interrupt Config Register */
	unsigned char dbg;	/* I2C Bus Debug Register */
};

void i2c_init(uintptr_t nxp_i2c_addr);
int i2c_read(unsigned char chip, int addr, int alen,
	     unsigned char *buf, int len);
int i2c_write(unsigned char chip, int addr, int alen,
	      const unsigned char *buf, int len);
int i2c_probe_chip(unsigned char chip);

#endif /* I2C_H */