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/*
* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _QUARK_MSG_PORT_H_
#define _QUARK_MSG_PORT_H_
/*
* In the Quark SoC, some chipset commands are accomplished by utilizing
* the internal message network within the host bridge (D0:F0). Accesses
* to this network are accomplished by populating the message control
* register (MCR), Message Control Register eXtension (MCRX) and the
* message data register (MDR).
*/
#define MSG_CTRL_REG 0xd0 /* Message Control Register */
#define MSG_DATA_REG 0xd4 /* Message Data Register */
#define MSG_CTRL_EXT_REG 0xd8 /* Message Control Register EXT */
/* Normal Read/Write OpCodes */
#define MSG_OP_READ 0x10
#define MSG_OP_WRITE 0x11
/* Alternative Read/Write OpCodes */
#define MSG_OP_ALT_READ 0x06
#define MSG_OP_ALT_WRITE 0x07
/* IO Read/Write OpCodes */
#define MSG_OP_IO_READ 0x02
#define MSG_OP_IO_WRITE 0x03
/* All byte enables */
#define MSG_BYTE_ENABLE 0xf0
#ifndef __ASSEMBLY__
/**
* msg_port_setup - set up the message port control register
*
* @op: message bus access opcode
* @port: port number on the message bus
* @reg: register number within a port
*/
void msg_port_setup(int op, int port, int reg);
/**
* msg_port_read - read a message port register using normal opcode
*
* @port: port number on the message bus
* @reg: register number within a port
*
* @return: message port register value
*/
u32 msg_port_read(u8 port, u32 reg);
/**
* msg_port_write - write a message port register using normal opcode
*
* @port: port number on the message bus
* @reg: register number within a port
* @value: register value to write
*/
void msg_port_write(u8 port, u32 reg, u32 value);
/**
* msg_port_alt_read - read a message port register using alternative opcode
*
* @port: port number on the message bus
* @reg: register number within a port
*
* @return: message port register value
*/
u32 msg_port_alt_read(u8 port, u32 reg);
/**
* msg_port_alt_write - write a message port register using alternative opcode
*
* @port: port number on the message bus
* @reg: register number within a port
* @value: register value to write
*/
void msg_port_alt_write(u8 port, u32 reg, u32 value);
/**
* msg_port_io_read - read a message port register using I/O opcode
*
* @port: port number on the message bus
* @reg: register number within a port
*
* @return: message port register value
*/
u32 msg_port_io_read(u8 port, u32 reg);
/**
* msg_port_io_write - write a message port register using I/O opcode
*
* @port: port number on the message bus
* @reg: register number within a port
* @value: register value to write
*/
void msg_port_io_write(u8 port, u32 reg, u32 value);
#endif /* __ASSEMBLY__ */
#endif /* _QUARK_MSG_PORT_H_ */
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