1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /* Copyright (c) 2010-2012 Broadcom. All rights reserved. */
8 #include "vchi_common.h"
10 /******************************************************************************
12 *****************************************************************************/
14 #define VCHI_BULK_ROUND_UP(x) ((((unsigned long)(x)) + VCHI_BULK_ALIGN - 1) & ~(VCHI_BULK_ALIGN - 1))
15 #define VCHI_BULK_ROUND_DOWN(x) (((unsigned long)(x)) & ~(VCHI_BULK_ALIGN - 1))
16 #define VCHI_BULK_ALIGN_NBYTES(x) (VCHI_BULK_ALIGNED(x) ? 0 : (VCHI_BULK_ALIGN - ((unsigned long)(x) & (VCHI_BULK_ALIGN - 1))))
19 #define VCHI_BULK_ALIGNED(x) 1
21 #define VCHI_BULK_ALIGNED(x) (((unsigned long)(x) & (VCHI_BULK_ALIGN - 1)) == 0)
28 #define VCHI_VERSION(v_) { v_, v_ }
29 #define VCHI_VERSION_EX(v_, m_) { v_, m_ }
31 // Macros to manipulate 'FOURCC' values
32 #define MAKE_FOURCC(x) ((int32_t)((x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3]))
34 // Opaque service information
35 struct opaque_vchi_service_t;
37 // Descriptor for a held message. Allocated by client, initialised by vchi_msg_hold,
38 // vchi_msg_iter_hold or vchi_msg_iter_hold_next. Fields are for internal VCHI use only.
39 struct vchi_held_msg {
40 struct opaque_vchi_service_t *service;
44 // structure used to provide the information needed to open a server or a client
45 struct service_creation {
46 struct vchi_version version;
48 vchi_callback callback;
52 // Opaque handle for a VCHIQ instance
53 struct vchiq_instance;
55 // Opaque handle for a server or client
58 /******************************************************************************
59 * Global funcs - implementation is specific to which side you are on
61 *****************************************************************************/
63 // Routine used to initialise the vchi on both local + remote connections
64 extern int32_t vchi_initialise(struct vchiq_instance **instance);
66 extern int32_t vchi_connect(struct vchiq_instance *instance);
68 //When this is called, ensure that all services have no data pending.
69 //Bulk transfers can remain 'queued'
70 extern int32_t vchi_disconnect(struct vchiq_instance *instance);
72 /******************************************************************************
74 *****************************************************************************/
75 // Routine to open a named service
76 extern int32_t vchi_service_open(struct vchiq_instance *instance,
77 struct service_creation *setup,
78 struct vchi_service **service);
80 extern int32_t vchi_get_peer_version(struct vchi_service *service,
83 // Routine to close a named service
84 extern int32_t vchi_service_close(struct vchi_service *service);
86 // Routine to increment ref count on a named service
87 extern int32_t vchi_service_use(struct vchi_service *service);
89 // Routine to decrement ref count on a named service
90 extern int32_t vchi_service_release(struct vchi_service *service);
92 /* Routine to send a message from kernel memory across a service */
93 extern int vchi_queue_kernel_message(struct vchi_service *service, void *data,
96 // Routine to receive a msg from a service
97 // Dequeue is equivalent to hold, copy into client buffer, release
98 extern int32_t vchi_msg_dequeue(struct vchi_service *service, void *data,
99 uint32_t max_data_size_to_read,
100 uint32_t *actual_msg_size,
101 enum vchi_flags flags);
103 // Routine to look at a message in place.
104 // The message is dequeued, so the caller is left holding it; the descriptor is
105 // filled in and must be released when the user has finished with the message.
106 extern int32_t vchi_msg_hold(struct vchi_service *service,
107 void **data, // } may be NULL, as info can be
108 uint32_t *msg_size, // } obtained from HELD_MSG_T
109 enum vchi_flags flags,
110 struct vchi_held_msg *message_descriptor);
112 /*******************************************************************************
113 * Global service support API - operations on held messages
114 * and message iterators
115 ******************************************************************************/
117 // Routine to release a held message after it has been processed
118 extern int32_t vchi_held_msg_release(struct vchi_held_msg *message);
120 /******************************************************************************
122 *****************************************************************************/
124 // Routine to prepare interface for a transfer from the other side
125 extern int32_t vchi_bulk_queue_receive(struct vchi_service *service,
128 enum vchi_flags flags,
129 void *transfer_handle);
131 // Routine to queue up data ready for transfer to the other (once they have signalled they are ready)
132 extern int32_t vchi_bulk_queue_transmit(struct vchi_service *service,
133 const void *data_src,
135 enum vchi_flags flags,
136 void *transfer_handle);
138 /******************************************************************************
139 * Configuration plumbing
140 *****************************************************************************/
144 /****************************** End of file **********************************/