xref: /linux/drivers/platform/goldfish/goldfish_pipe_qemu.h (revision 3eb66e91a25497065c5322b1268cbc3953642227)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * IMPORTANT: The following constants must match the ones used and defined in
4  * external/qemu/include/hw/misc/goldfish_pipe.h
5  */
6 
7 #ifndef GOLDFISH_PIPE_QEMU_H
8 #define GOLDFISH_PIPE_QEMU_H
9 
10 /* List of bitflags returned in status of CMD_POLL command */
11 enum PipePollFlags {
12 	PIPE_POLL_IN	= 1 << 0,
13 	PIPE_POLL_OUT	= 1 << 1,
14 	PIPE_POLL_HUP	= 1 << 2
15 };
16 
17 /* Possible status values used to signal errors */
18 enum PipeErrors {
19 	PIPE_ERROR_INVAL	= -1,
20 	PIPE_ERROR_AGAIN	= -2,
21 	PIPE_ERROR_NOMEM	= -3,
22 	PIPE_ERROR_IO		= -4
23 };
24 
25 /* Bit-flags used to signal events from the emulator */
26 enum PipeWakeFlags {
27 	/* emulator closed pipe */
28 	PIPE_WAKE_CLOSED		= 1 << 0,
29 
30 	/* pipe can now be read from */
31 	PIPE_WAKE_READ			= 1 << 1,
32 
33 	/* pipe can now be written to */
34 	PIPE_WAKE_WRITE			= 1 << 2,
35 
36 	/* unlock this pipe's DMA buffer */
37 	PIPE_WAKE_UNLOCK_DMA		= 1 << 3,
38 
39 	/* unlock DMA buffer of the pipe shared to this pipe */
40 	PIPE_WAKE_UNLOCK_DMA_SHARED	= 1 << 4,
41 };
42 
43 /* Possible pipe closing reasons */
44 enum PipeCloseReason {
45 	/* guest sent a close command */
46 	PIPE_CLOSE_GRACEFUL		= 0,
47 
48 	/* guest rebooted, we're closing the pipes */
49 	PIPE_CLOSE_REBOOT		= 1,
50 
51 	/* close old pipes on snapshot load */
52 	PIPE_CLOSE_LOAD_SNAPSHOT	= 2,
53 
54 	/* some unrecoverable error on the pipe */
55 	PIPE_CLOSE_ERROR		= 3,
56 };
57 
58 /* Bit flags for the 'flags' field */
59 enum PipeFlagsBits {
60 	BIT_CLOSED_ON_HOST = 0,  /* pipe closed by host */
61 	BIT_WAKE_ON_WRITE  = 1,  /* want to be woken on writes */
62 	BIT_WAKE_ON_READ   = 2,  /* want to be woken on reads */
63 };
64 
65 enum PipeRegs {
66 	PIPE_REG_CMD = 0,
67 
68 	PIPE_REG_SIGNAL_BUFFER_HIGH = 4,
69 	PIPE_REG_SIGNAL_BUFFER = 8,
70 	PIPE_REG_SIGNAL_BUFFER_COUNT = 12,
71 
72 	PIPE_REG_OPEN_BUFFER_HIGH = 20,
73 	PIPE_REG_OPEN_BUFFER = 24,
74 
75 	PIPE_REG_VERSION = 36,
76 
77 	PIPE_REG_GET_SIGNALLED = 48,
78 };
79 
80 enum PipeCmdCode {
81 	/* to be used by the pipe device itself */
82 	PIPE_CMD_OPEN		= 1,
83 
84 	PIPE_CMD_CLOSE,
85 	PIPE_CMD_POLL,
86 	PIPE_CMD_WRITE,
87 	PIPE_CMD_WAKE_ON_WRITE,
88 	PIPE_CMD_READ,
89 	PIPE_CMD_WAKE_ON_READ,
90 
91 	/*
92 	 * TODO(zyy): implement a deferred read/write execution to allow
93 	 * parallel processing of pipe operations on the host.
94 	 */
95 	PIPE_CMD_WAKE_ON_DONE_IO,
96 };
97 
98 #endif /* GOLDFISH_PIPE_QEMU_H */
99