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1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
2 | /* | |
3 | * Copyright 2019 Google Inc | |
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 | * Provides a simple driver to control the ASPEED P2A interface which allows | |
11 | * the host to read and write to various regions of the BMC's memory. | |
12 | */ | |
13 | ||
14 | #ifndef _UAPI_LINUX_ASPEED_P2A_CTRL_H | |
15 | #define _UAPI_LINUX_ASPEED_P2A_CTRL_H | |
16 | ||
17 | #include <linux/ioctl.h> | |
18 | #include <linux/types.h> | |
19 | ||
20 | #define ASPEED_P2A_CTRL_READ_ONLY 0 | |
21 | #define ASPEED_P2A_CTRL_READWRITE 1 | |
22 | ||
23 | /* | |
24 | * This driver provides a mechanism for enabling or disabling the read-write | |
25 | * property of specific windows into the ASPEED BMC's memory. | |
26 | * | |
27 | * A user can map a region of the BMC's memory as read-only or read-write, with | |
28 | * the caveat that once any region is mapped, all regions are unlocked for | |
29 | * reading. | |
30 | */ | |
31 | ||
32 | /* | |
33 | * Unlock a region of BMC physical memory for access from the host. | |
34 | * | |
35 | * Also used to read back the optional memory-region configuration for the | |
36 | * driver. | |
37 | */ | |
38 | struct aspeed_p2a_ctrl_mapping { | |
39 | __u64 addr; | |
40 | __u32 length; | |
41 | __u32 flags; | |
42 | }; | |
43 | ||
44 | #define __ASPEED_P2A_CTRL_IOCTL_MAGIC 0xb3 | |
45 | ||
46 | /* | |
47 | * This IOCTL is meant to configure a region or regions of memory given a | |
48 | * starting address and length to be readable by the host, or | |
49 | * readable-writeable. | |
50 | */ | |
51 | #define ASPEED_P2A_CTRL_IOCTL_SET_WINDOW _IOW(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \ | |
52 | 0x00, struct aspeed_p2a_ctrl_mapping) | |
53 | ||
54 | /* | |
55 | * This IOCTL is meant to read back to the user the base address and length of | |
56 | * the memory-region specified to the driver for use with mmap. | |
57 | */ | |
58 | #define ASPEED_P2A_CTRL_IOCTL_GET_MEMORY_CONFIG \ | |
59 | _IOWR(__ASPEED_P2A_CTRL_IOCTL_MAGIC, \ | |
60 | 0x01, struct aspeed_p2a_ctrl_mapping) | |
61 | ||
62 | #endif /* _UAPI_LINUX_ASPEED_P2A_CTRL_H */ |