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 
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 
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 
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 
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
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
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