1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * IBM ASM Service Processor Device Driver
 4 *
 5 * Copyright (C) IBM Corporation, 2004
 6 *
 7 * Author: Max Asböck <amax@us.ibm.com>
 8 */
 9
10#pragma pack(1)
11struct i2o_header {
12	u8	version;
13	u8	message_flags;
14	u16	message_size;
15	u8	target;
16	u8	initiator_and_target;
17	u8	initiator;
18	u8	function;
19	u32	initiator_context;
20};
21#pragma pack()
22
23#define I2O_HEADER_TEMPLATE \
24      { .version              = 0x01, \
25	.message_flags        = 0x00, \
26	.function             = 0xFF, \
27	.initiator            = 0x00, \
28	.initiator_and_target = 0x40, \
29	.target               = 0x00, \
30	.initiator_context    = 0x0 }
31
32#define I2O_MESSAGE_SIZE	0x1000
33#define I2O_COMMAND_SIZE	(I2O_MESSAGE_SIZE - sizeof(struct i2o_header))
34
35#pragma pack(1)
36struct i2o_message {
37	struct i2o_header	header;
38	void			*data;
39};
40#pragma pack()
41
42static inline unsigned short outgoing_message_size(unsigned int data_size)
43{
44	unsigned int size;
45	unsigned short i2o_size;
46
47	if (data_size > I2O_COMMAND_SIZE)
48		data_size = I2O_COMMAND_SIZE;
49
50	size = sizeof(struct i2o_header) + data_size;
51
52	i2o_size = size / sizeof(u32);
53
54	if (size % sizeof(u32))
55	       i2o_size++;
56
57	return i2o_size;
58}
59
60static inline u32 incoming_data_size(struct i2o_message *i2o_message)
61{
62	return (sizeof(u32) * i2o_message->header.message_size);
63}