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 
20 #define CX18_DMA_UNMAPPED	((u32) -1)
21 
22 /* cx18_buffer utility functions */
23 
24 static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
25 	struct cx18_buffer *buf)
26 {
27 	pci_dma_sync_single_for_cpu(s->cx->pci_dev, buf->dma_handle,
28 				s->buf_size, s->dma);
29 }
30 
31 static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
32 	struct cx18_buffer *buf)
33 {
34 	pci_dma_sync_single_for_device(s->cx->pci_dev, buf->dma_handle,
35 				s->buf_size, s->dma);
36 }
37 
38 void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl);
39 
40 static inline void cx18_mdl_sync_for_device(struct cx18_stream *s,
41 					    struct cx18_mdl *mdl)
42 {
43 	if (list_is_singular(&mdl->buf_list))
44 		cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list,
45 							     struct cx18_buffer,
46 							     list));
47 	else
48 		_cx18_mdl_sync_for_device(s, mdl);
49 }
50 
51 void cx18_buf_swap(struct cx18_buffer *buf);
52 void _cx18_mdl_swap(struct cx18_mdl *mdl);
53 
54 static inline void cx18_mdl_swap(struct cx18_mdl *mdl)
55 {
56 	if (list_is_singular(&mdl->buf_list))
57 		cx18_buf_swap(list_first_entry(&mdl->buf_list,
58 					       struct cx18_buffer, list));
59 	else
60 		_cx18_mdl_swap(mdl);
61 }
62 
63 /* cx18_queue utility functions */
64 struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
65 				 struct cx18_queue *q, int to_front);
66 
67 static inline
68 struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
69 				struct cx18_queue *q)
70 {
71 	return _cx18_enqueue(s, mdl, q, 0); /* FIFO */
72 }
73 
74 static inline
75 struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl,
76 			     struct cx18_queue *q)
77 {
78 	return _cx18_enqueue(s, mdl, q, 1); /* LIFO */
79 }
80 
81 void cx18_queue_init(struct cx18_queue *q);
82 struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q);
83 struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
84 	u32 bytesused);
85 void cx18_flush_queues(struct cx18_stream *s);
86 
87 /* queue MDL reconfiguration helpers */
88 void cx18_unload_queues(struct cx18_stream *s);
89 void cx18_load_queues(struct cx18_stream *s);
90 
91 /* cx18_stream utility functions */
92 int cx18_stream_alloc(struct cx18_stream *s);
93 void cx18_stream_free(struct cx18_stream *s);
94