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 30 static 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 35 static 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 43 static inline int ivtv_might_use_dma(struct ivtv_stream *s) 44 { 45 return s->dma != PCI_DMA_NONE; 46 } 47 48 static inline int ivtv_use_dma(struct ivtv_stream *s) 49 { 50 return !ivtv_use_pio(s); 51 } 52 53 static 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 60 static 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 67 int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes); 68 void ivtv_buf_swap(struct ivtv_buffer *buf); 69 70 /* ivtv_queue utility functions */ 71 void ivtv_queue_init(struct ivtv_queue *q); 72 void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q); 73 struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q); 74 int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal, 75 struct ivtv_queue *to, int needed_bytes); 76 void ivtv_flush_queues(struct ivtv_stream *s); 77 78 /* ivtv_stream utility functions */ 79 int ivtv_stream_alloc(struct ivtv_stream *s); 80 void ivtv_stream_free(struct ivtv_stream *s); 81 82 static 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 89 static 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