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
  18 static 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
  23 static 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
  31 static inline int ivtv_might_use_dma(struct ivtv_stream *s)
  32 {
  33         return s->dma != PCI_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                 pci_dma_sync_single_for_cpu(s->itv->pdev, 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                 pci_dma_sync_single_for_device(s->itv->pdev, buf->dma_handle,
  52                                 s->buf_size + 256, s->dma);
  53 }
  54
  55 int ivtv_buf_copy_from_user(struct ivtv_stream *s, struct ivtv_buffer *buf, const char __user *src, int copybytes);
  56 void ivtv_buf_swap(struct ivtv_buffer *buf);
  57
  58 /* ivtv_queue utility functions */
  59 void ivtv_queue_init(struct ivtv_queue *q);
  60 void ivtv_enqueue(struct ivtv_stream *s, struct ivtv_buffer *buf, struct ivtv_queue *q);
  61 struct ivtv_buffer *ivtv_dequeue(struct ivtv_stream *s, struct ivtv_queue *q);
  62 int ivtv_queue_move(struct ivtv_stream *s, struct ivtv_queue *from, struct ivtv_queue *steal,
  63                     struct ivtv_queue *to, int needed_bytes);
  64 void ivtv_flush_queues(struct ivtv_stream *s);
  65
  66 /* ivtv_stream utility functions */
  67 int ivtv_stream_alloc(struct ivtv_stream *s);
  68 void ivtv_stream_free(struct ivtv_stream *s);
  69
  70 static 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
  77 static 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