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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_H11#define IVTV_QUEUE_H12 13#define IVTV_DMA_UNMAPPED ((u32) -1)14#define SLICED_VBI_PIO 015 16/* ivtv_buffer utility functions */17 18static 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 23static 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 31static inline int ivtv_might_use_dma(struct ivtv_stream *s)32{33 return s->dma != DMA_NONE;34}35 36static inline int ivtv_use_dma(struct ivtv_stream *s)37{38 return !ivtv_use_pio(s);39}40 41static 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 48static 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 56int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);57void ivtv_buf_swap(struct ivtv_buffer *buf);58 59/* ivtv_queue utility functions */60void ivtv_queue_init(struct ivtv_queue *q);61void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);62struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);63int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,64 struct ivtv_queue *to, int needed_bytes);65void ivtv_flush_queues(struct ivtv_stream *s);66 67/* ivtv_stream utility functions */68int ivtv_stream_alloc(struct ivtv_stream *s);69void ivtv_stream_free(struct ivtv_stream *s);70 71static 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 79static 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#endif88