xref: /openbmc/linux/drivers/misc/ibmasm/i2o.h (revision 1a59d1b8)
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)
11 struct 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)
36 struct i2o_message {
37 	struct i2o_header	header;
38 	void			*data;
39 };
40 #pragma pack()
41 
outgoing_message_size(unsigned int data_size)42 static 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 
incoming_data_size(struct i2o_message * i2o_message)60 static inline u32 incoming_data_size(struct i2o_message *i2o_message)
61 {
62 	return (sizeof(u32) * i2o_message->header.message_size);
63 }
64