| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * cx18 buffer queues |
| 3 | * |
| 4 | * Derived from ivtv-queue.h |
| 5 | * |
| 6 | * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> |
| 7 | * Copyright (C) 2008 Andy Walls <awalls@md.metrocast.net> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #define CX18_DMA_UNMAPPED ((u32) -1) |
| 21 | |
| 22 | /* cx18_buffer utility functions */ |
| 23 | |
| 24 | static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s, |
| 25 | struct cx18_buffer *buf) |
| 26 | { |
| 27 | pci_dma_sync_single_for_cpu(s->cx->pci_dev, buf->dma_handle, |
| 28 | s->buf_size, s->dma); |
| 29 | } |
| 30 | |
| 31 | static inline void cx18_buf_sync_for_device(struct cx18_stream *s, |
| 32 | struct cx18_buffer *buf) |
| 33 | { |
| 34 | pci_dma_sync_single_for_device(s->cx->pci_dev, buf->dma_handle, |
| 35 | s->buf_size, s->dma); |
| 36 | } |
| 37 | |
| 38 | void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl); |
| 39 | |
| 40 | static inline void cx18_mdl_sync_for_device(struct cx18_stream *s, |
| 41 | struct cx18_mdl *mdl) |
| 42 | { |
| 43 | if (list_is_singular(&mdl->buf_list)) |
| 44 | cx18_buf_sync_for_device(s, list_first_entry(&mdl->buf_list, |
| 45 | struct cx18_buffer, |
| 46 | list)); |
| 47 | else |
| 48 | _cx18_mdl_sync_for_device(s, mdl); |
| 49 | } |
| 50 | |
| 51 | void cx18_buf_swap(struct cx18_buffer *buf); |
| 52 | void _cx18_mdl_swap(struct cx18_mdl *mdl); |
| 53 | |
| 54 | static inline void cx18_mdl_swap(struct cx18_mdl *mdl) |
| 55 | { |
| 56 | if (list_is_singular(&mdl->buf_list)) |
| 57 | cx18_buf_swap(list_first_entry(&mdl->buf_list, |
| 58 | struct cx18_buffer, list)); |
| 59 | else |
| 60 | _cx18_mdl_swap(mdl); |
| 61 | } |
| 62 | |
| 63 | /* cx18_queue utility functions */ |
| 64 | struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl, |
| 65 | struct cx18_queue *q, int to_front); |
| 66 | |
| 67 | static inline |
| 68 | struct cx18_queue *cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl, |
| 69 | struct cx18_queue *q) |
| 70 | { |
| 71 | return _cx18_enqueue(s, mdl, q, 0); /* FIFO */ |
| 72 | } |
| 73 | |
| 74 | static inline |
| 75 | struct cx18_queue *cx18_push(struct cx18_stream *s, struct cx18_mdl *mdl, |
| 76 | struct cx18_queue *q) |
| 77 | { |
| 78 | return _cx18_enqueue(s, mdl, q, 1); /* LIFO */ |
| 79 | } |
| 80 | |
| 81 | void cx18_queue_init(struct cx18_queue *q); |
| 82 | struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q); |
| 83 | struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id, |
| 84 | u32 bytesused); |
| 85 | void cx18_flush_queues(struct cx18_stream *s); |
| 86 | |
| 87 | /* queue MDL reconfiguration helpers */ |
| 88 | void cx18_unload_queues(struct cx18_stream *s); |
| 89 | void cx18_load_queues(struct cx18_stream *s); |
| 90 | |
| 91 | /* cx18_stream utility functions */ |
| 92 | int cx18_stream_alloc(struct cx18_stream *s); |
| 93 | void cx18_stream_free(struct cx18_stream *s); |