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 29 static 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 36 static 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 43 void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl); 44 45 static 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 56 void cx18_buf_swap(struct cx18_buffer *buf); 57 void _cx18_mdl_swap(struct cx18_mdl *mdl); 58 59 static 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 */ 69 struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl, 70 struct cx18_queue *q, int to_front); 71 72 static inline 73 struct 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 79 static inline 80 struct 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 86 void cx18_queue_init(struct cx18_queue *q); 87 struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q); 88 struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id, 89 u32 bytesused); 90 void cx18_flush_queues(struct cx18_stream *s); 91 92 /* queue MDL reconfiguration helpers */ 93 void cx18_unload_queues(struct cx18_stream *s); 94 void cx18_load_queues(struct cx18_stream *s); 95 96 /* cx18_stream utility functions */ 97 int cx18_stream_alloc(struct cx18_stream *s); 98 void cx18_stream_free(struct cx18_stream *s); 99