LXR linux/drivers/media/pci/ivtv/ivtv-queue.h

   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
  18static inline int ivtv_might_use_pio(struct ivtv_stream *s)
  19{
  20        return s->dma == PCI_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 == PCI_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 != PCI_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                pci_dma_sync_single_for_cpu(s->itv->pdev, 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                pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle,
  52                                s->buf_size + 256, s->dma);
  53}
  54
  55int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
  56void ivtv_buf_swap(struct ivtv_buffer *buf);
  57
  58/* ivtv_queue utility functions */
  59void ivtv_queue_init(struct ivtv_queue *q);
  60void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
  61struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
  62int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
  63                    struct ivtv_queue *to, int needed_bytes);
  64void ivtv_flush_queues(struct ivtv_stream *s);
  65
  66/* ivtv_stream utility functions */
  67int ivtv_stream_alloc(struct ivtv_stream *s);
  68void ivtv_stream_free(struct ivtv_stream *s);
  69
  70static inline void ivtv_stream_sync_for_cpu(struct ivtv_stream *s)
  71{
  72        if (ivtv_use_dma(s))
  73                pci_dma_sync_single_for_cpu(s->itv->pdev, s->sg_handle,
  74                        sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
  75}
  76
  77static inline void ivtv_stream_sync_for_device(struct ivtv_stream *s)
  78{
  79        if (ivtv_use_dma(s))
  80                pci_dma_sync_single_for_device(s->itv->pdev, s->sg_handle,
  81                        sizeof(struct ivtv_sg_element), PCI_DMA_TODEVICE);
  82}
  83
  84#endif
  85