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 */