1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  * Copyright 2017 IBM Corp.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * as published by the Free Software Foundation; either version
8  * 2 of the License, or (at your option) any later version.
9  */
10 
11 #ifndef _UAPI_LINUX_ASPEED_LPC_CTRL_H
12 #define _UAPI_LINUX_ASPEED_LPC_CTRL_H
13 
14 #include <linux/ioctl.h>
15 #include <linux/types.h>
16 
17 /* Window types */
18 #define ASPEED_LPC_CTRL_WINDOW_FLASH	1
19 #define ASPEED_LPC_CTRL_WINDOW_MEMORY	2
20 
21 /*
22  * This driver provides a window for the host to access a BMC resource
23  * across the BMC <-> Host LPC bus.
24  *
25  * window_type: The BMC resource that the host will access through the
26  * window. BMC flash and BMC RAM.
27  *
28  * window_id: For each window type there may be multiple windows,
29  * these are referenced by ID.
30  *
31  * flags: Reserved for future use, this field is expected to be
32  * zeroed.
33  *
34  * addr: Address on the host LPC bus that the specified window should
35  * be mapped. This address must be power of two aligned.
36  *
37  * offset: Offset into the BMC window that should be mapped to the
38  * host (at addr). This must be a multiple of size.
39  *
40  * size: The size of the mapping. The smallest possible size is 64K.
41  * This must be power of two aligned.
42  *
43  */
44 
45 struct aspeed_lpc_ctrl_mapping {
46 	__u8	window_type;
47 	__u8	window_id;
48 	__u16	flags;
49 	__u32	addr;
50 	__u32	offset;
51 	__u32	size;
52 };
53 
54 #define __ASPEED_LPC_CTRL_IOCTL_MAGIC	0xb2
55 
56 #define ASPEED_LPC_CTRL_IOCTL_GET_SIZE	_IOWR(__ASPEED_LPC_CTRL_IOCTL_MAGIC, \
57 		0x00, struct aspeed_lpc_ctrl_mapping)
58 
59 #define ASPEED_LPC_CTRL_IOCTL_MAP	_IOW(__ASPEED_LPC_CTRL_IOCTL_MAGIC, \
60 		0x01, struct aspeed_lpc_ctrl_mapping)
61 
62 #endif /* _UAPI_LINUX_ASPEED_LPC_CTRL_H */
63