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