| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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| 2 | /* |
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| 3 | * cx18 buffer queues |
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| 4 | * |
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| 5 | * Derived from ivtv-queue.h |
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| 6 | * |
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| 7 | * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> |
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| 8 | * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net> |
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| 9 | */ |
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| 10 | |
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| 11 | #define CX18_DMA_UNMAPPED ((u32) -1) |
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| 12 | |
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| 13 | /* cx18_buffer utility functions */ |
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| 14 | |
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| 15 | static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s, |
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| 16 | struct cx18_buffer *buf) |
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| 17 | { |
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| 18 | dma_sync_single_for_cpu(dev: &s->cx->pci_dev->dev, addr: buf->dma_handle, |
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| 19 | size: s->buf_size, dir: s->dma); |
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| 20 | } |
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| 21 | |
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| 22 | static inline void cx18_buf_sync_for_device(struct cx18_stream *s, |
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| 23 | struct cx18_buffer *buf) |
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| 24 | { |
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| 25 | dma_sync_single_for_device(dev: &s->cx->pci_dev->dev, addr: buf->dma_handle, |
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| 26 | size: s->buf_size, dir: s->dma); |
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| 27 | } |
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| 28 | |
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| 29 | void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl); |
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| 30 | |
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| 31 | static inline void cx18_mdl_sync_for_device(struct cx18_stream *s, |
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| 32 | struct cx18_mdl *mdl) |
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| 33 | { |
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| 34 | if (list_is_singular(head: &mdl->buf_list)) |
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| 35 | cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list, |
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| 36 | struct cx18_buffer, |
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| 37 | list)); |
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| 38 | else |
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| 39 | _cx18_mdl_sync_for_device(s, mdl); |
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| 40 | } |
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| 41 | |
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| 42 | void cx18_buf_swap(struct cx18_buffer *buf); |
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| 43 | void _cx18_mdl_swap(struct cx18_mdl *mdl); |
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| 44 | |
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| 45 | static inline void cx18_mdl_swap(struct cx18_mdl *mdl) |
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| 46 | { |
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| 47 | if (list_is_singular(head: &mdl->buf_list)) |
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| 48 | cx18_buf_swap(list_first_entry(&mdl->buf_list, |
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| 49 | struct cx18_buffer, list)); |
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| 50 | else |
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| 51 | _cx18_mdl_swap(mdl); |
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| 52 | } |
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| 53 | |
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| 54 | /* cx18_queue utility functions */ |
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| 55 | struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl, |
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| 56 | struct cx18_queue *q, int to_front); |
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| 57 | |
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| 58 | static inline |
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| 59 | struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl, |
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| 60 | struct cx18_queue *q) |
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| 61 | { |
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| 62 | return _cx18_enqueue(s, mdl, q, to_front: 0); /* FIFO */ |
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| 63 | } |
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| 64 | |
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| 65 | static inline |
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| 66 | struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl, |
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| 67 | struct cx18_queue *q) |
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| 68 | { |
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| 69 | return _cx18_enqueue(s, mdl, q, to_front: 1); /* LIFO */ |
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| 70 | } |
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| 71 | |
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| 72 | void cx18_queue_init(struct cx18_queue *q); |
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| 73 | struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q); |
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| 74 | struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id, |
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| 75 | u32 bytesused); |
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| 76 | void cx18_flush_queues(struct cx18_stream *s); |
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| 77 | |
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| 78 | /* queue MDL reconfiguration helpers */ |
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| 79 | void cx18_unload_queues(struct cx18_stream *s); |
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| 80 | void cx18_load_queues(struct cx18_stream *s); |
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| 81 | |
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| 82 | /* cx18_stream utility functions */ |
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| 83 | int cx18_stream_alloc(struct cx18_stream *s); |
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| 84 | void cx18_stream_free(struct cx18_stream *s); |
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| 85 | |
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