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