1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * cx18 buffer queues
4 *
5 * Derived from ivtv-queue.h
6 *
7 * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
8 * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net>
9 */
10
11 #define CX18_DMA_UNMAPPED ((u32) -1)
12
13 /* cx18_buffer utility functions */
14
cx18_buf_sync_for_cpu(struct cx18_stream * s,struct cx18_buffer * buf)15 static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
16 struct cx18_buffer *buf)
17 {
18 pci_dma_sync_single_for_cpu(s->cx->pci_dev, buf->dma_handle,
19 s->buf_size, s->dma);
20 }
21
cx18_buf_sync_for_device(struct cx18_stream * s,struct cx18_buffer * buf)22 static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
23 struct cx18_buffer *buf)
24 {
25 pci_dma_sync_single_for_device(s->cx->pci_dev, buf->dma_handle,
26 s->buf_size, s->dma);
27 }
28
29 void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
30
cx18_mdl_sync_for_device(struct cx18_stream * s,struct cx18_mdl * mdl)31 static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,
32 struct cx18_mdl *mdl)
33 {
34 if (list_is_singular(&mdl->buf_list))
35 cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,
36 struct cx18_buffer,
37 list));
38 else
39 _cx18_mdl_sync_for_device(s, mdl);
40 }
41
42 void cx18_buf_swap(struct cx18_buffer *buf);
43 void _cx18_mdl_swap(struct cx18_mdl *mdl);
44
cx18_mdl_swap(struct cx18_mdl * mdl)45 static inline void cx18_mdl_swap(struct cx18_mdl *mdl)
46 {
47 if (list_is_singular(&mdl->buf_list))
48 cx18_buf_swap(list_first_entry(&mdl->buf_list,
49 struct cx18_buffer, list));
50 else
51 _cx18_mdl_swap(mdl);
52 }
53
54 /* cx18_queue utility functions */
55 struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
56 struct cx18_queue *q, int to_front);
57
58 static inline
cx18_enqueue(struct cx18_stream * s,struct cx18_mdl * mdl,struct cx18_queue * q)59 struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
60 struct cx18_queue *q)
61 {
62 return _cx18_enqueue(s, mdl, q, 0); /* FIFO */
63 }
64
65 static inline
cx18_push(struct cx18_stream * s,struct cx18_mdl * mdl,struct cx18_queue * q)66 struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,
67 struct cx18_queue *q)
68 {
69 return _cx18_enqueue(s, mdl, q, 1); /* LIFO */
70 }
71
72 void cx18_queue_init(struct cx18_queue *q);
73 struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
74 struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
75 u32 bytesused);
76 void cx18_flush_queues(struct cx18_stream *s);
77
78 /* queue MDL reconfiguration helpers */
79 void cx18_unload_queues(struct cx18_stream *s);
80 void cx18_load_queues(struct cx18_stream *s);
81
82 /* cx18_stream utility functions */
83 int cx18_stream_alloc(struct cx18_stream *s);
84 void cx18_stream_free(struct cx18_stream *s);
85