1/* 2 buffer queues. 3 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com> 4 Copyright (C) 2004 Chris Kennedy <c@groovy.org> 5 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22#ifndef IVTV_QUEUE_H 23#define IVTV_QUEUE_H 24 25#define IVTV_DMA_UNMAPPED ((u32) -1) 26#define SLICED_VBI_PIO 0 27 28/* ivtv_buffer utility functions */ 29 30static inline int ivtv_might_use_pio(struct ivtv_stream *s) 31{ 32 return s->dma == PCI_DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI); 33} 34 35static inline int ivtv_use_pio(struct ivtv_stream *s) 36{ 37 struct ivtv *itv = s->itv; 38 39 return s->dma == PCI_DMA_NONE || 40 (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set); 41} 42 43static inline int ivtv_might_use_dma(struct ivtv_stream *s) 44{ 45 return s->dma != PCI_DMA_NONE; 46} 47 48static inline int ivtv_use_dma(struct ivtv_stream *s) 49{ 50 return !ivtv_use_pio(s); 51} 52 53static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf) 54{ 55 if (ivtv_use_dma(s)) 56 pci_dma_sync_single_for_cpu(s->itv->pdev, buf->dma_handle, 57 s->buf_size + 256, s->dma); 58} 59 60static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf) 61{ 62 if (ivtv_use_dma(s)) 63 pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle, 64 s->buf_size + 256, s->dma); 65} 66 67int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes); 68void ivtv_buf_swap(struct ivtv_buffer *buf); 69 70/* ivtv_queue utility functions */ 71void ivtv_queue_init(struct ivtv_queue *q); 72void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q); 73struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q); 74int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal, 75 struct ivtv_queue *to, int needed_bytes); 76void ivtv_flush_queues(struct ivtv_stream *s); 77 78/* ivtv_stream utility functions */ 79int ivtv_stream_alloc(struct ivtv_stream *s); 80void ivtv_stream_free(struct ivtv_stream *s); 81 82static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s) 83{ 84 if (ivtv_use_dma(s)) 85 pci_dma_sync_single_for_cpu(s->itv->pdev, s->sg_handle, 86 sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE); 87} 88 89static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s) 90{ 91 if (ivtv_use_dma(s)) 92 pci_dma_sync_single_for_device(s->itv->pdev, s->sg_handle, 93 sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE); 94} 95 96#endif 97