1/*
2 *  cx18 buffer queues
3 *
4 *  Derived from ivtv-queue.h
5 *
6 *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
7 *  Copyright (C) 2008  Andy Walls <awalls@md.metrocast.net>
8 *
9 *  This program is free software; you can redistribute it and/or modify
10 *  it under the terms of the GNU General Public License as published by
11 *  the Free Software Foundation; either version 2 of the License, or
12 *  (at your option) any later version.
13 *
14 *  This program is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this program; if not, write to the Free Software
21 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 *  02111-1307  USA
23 */
24
25#define CX18_DMA_UNMAPPED	((u32) -1)
26
27/* cx18_buffer utility functions */
28
29static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
30	struct cx18_buffer *buf)
31{
32	pci_dma_sync_single_for_cpu(s->cx->pci_dev, buf->dma_handle,
33				s->buf_size, s->dma);
34}
35
36static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
37	struct cx18_buffer *buf)
38{
39	pci_dma_sync_single_for_device(s->cx->pci_dev, buf->dma_handle,
40				s->buf_size, s->dma);
41}
42
43void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
44
45static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,
46					    struct cx18_mdl *mdl)
47{
48	if (list_is_singular(&mdl->buf_list))
49		cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,
50							     struct cx18_buffer,
51							     list));
52	else
53		_cx18_mdl_sync_for_device(s, mdl);
54}
55
56void cx18_buf_swap(struct cx18_buffer *buf);
57void _cx18_mdl_swap(struct cx18_mdl *mdl);
58
59static inline void cx18_mdl_swap(struct cx18_mdl *mdl)
60{
61	if (list_is_singular(&mdl->buf_list))
62		cx18_buf_swap(list_first_entry(&mdl->buf_list,
63					       struct cx18_buffer, list));
64	else
65		_cx18_mdl_swap(mdl);
66}
67
68/* cx18_queue utility functions */
69struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
70				 struct cx18_queue *q, int to_front);
71
72static inline
73struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
74				struct cx18_queue *q)
75{
76	return _cx18_enqueue(s, mdl, q, 0); /* FIFO */
77}
78
79static inline
80struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,
81			     struct cx18_queue *q)
82{
83	return _cx18_enqueue(s, mdl, q, 1); /* LIFO */
84}
85
86void cx18_queue_init(struct cx18_queue *q);
87struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
88struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
89	u32 bytesused);
90void cx18_flush_queues(struct cx18_stream *s);
91
92/* queue MDL reconfiguration helpers */
93void cx18_unload_queues(struct cx18_stream *s);
94void cx18_load_queues(struct cx18_stream *s);
95
96/* cx18_stream utility functions */
97int cx18_stream_alloc(struct cx18_stream *s);
98void cx18_stream_free(struct cx18_stream *s);
99