1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 buffer queues. 4 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com> 5 Copyright (C) 2004 Chris Kennedy <c@groovy.org> 6 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl> 7 8 */ 9 10 #ifndef IVTV_QUEUE_H 11 #define IVTV_QUEUE_H 12 13 #define IVTV_DMA_UNMAPPED ((u32) -1) 14 #define SLICED_VBI_PIO 0 15 16 /* ivtv_buffer utility functions */ 17 18 static inline int ivtv_might_use_pio(struct ivtv_stream *s) 19 { 20 return s->dma == DMA_NONE || (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI); 21 } 22 23 static inline int ivtv_use_pio(struct ivtv_stream *s) 24 { 25 struct ivtv *itv = s->itv; 26 27 return s->dma == DMA_NONE || 28 (SLICED_VBI_PIO && s->type == IVTV_ENC_STREAM_TYPE_VBI && itv->vbi.sliced_in->service_set); 29 } 30 31 static inline int ivtv_might_use_dma(struct ivtv_stream *s) 32 { 33 return s->dma != DMA_NONE; 34 } 35 36 static inline int ivtv_use_dma(struct ivtv_stream *s) 37 { 38 return !ivtv_use_pio(s); 39 } 40 41 static inline void ivtv_buf_sync_for_cpu(struct ivtv_stream *s, struct ivtv_buffer *buf) 42 { 43 if (ivtv_use_dma(s)) 44 dma_sync_single_for_cpu(&s->itv->pdev->dev, buf->dma_handle, 45 s->buf_size + 256, s->dma); 46 } 47 48 static inline void ivtv_buf_sync_for_device(struct ivtv_stream *s, struct ivtv_buffer *buf) 49 { 50 if (ivtv_use_dma(s)) 51 dma_sync_single_for_device(&s->itv->pdev->dev, 52 buf->dma_handle, s->buf_size + 256, 53 s->dma); 54 } 55 56 int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes); 57 void ivtv_buf_swap(struct ivtv_buffer *buf); 58 59 /* ivtv_queue utility functions */ 60 void ivtv_queue_init(struct ivtv_queue *q); 61 void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q); 62 struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q); 63 int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal, 64 struct ivtv_queue *to, int needed_bytes); 65 void ivtv_flush_queues(struct ivtv_stream *s); 66 67 /* ivtv_stream utility functions */ 68 int ivtv_stream_alloc(struct ivtv_stream *s); 69 void ivtv_stream_free(struct ivtv_stream *s); 70 71 static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s) 72 { 73 if (ivtv_use_dma(s)) 74 dma_sync_single_for_cpu(&s->itv->pdev->dev, s->sg_handle, 75 sizeof(struct ivtv_sg_element), 76 DMA_TO_DEVICE); 77 } 78 79 static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s) 80 { 81 if (ivtv_use_dma(s)) 82 dma_sync_single_for_device(&s->itv->pdev->dev, s->sg_handle, 83 sizeof(struct ivtv_sg_element), 84 DMA_TO_DEVICE); 85 } 86 87 #endif 88