diff options
Diffstat (limited to 'drivers/staging/dt3155v4l/dt3155-bufs.h')
| -rw-r--r-- | drivers/staging/dt3155v4l/dt3155-bufs.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/staging/dt3155v4l/dt3155-bufs.h b/drivers/staging/dt3155v4l/dt3155-bufs.h new file mode 100644 index 000000000000..db6d387231b2 --- /dev/null +++ b/drivers/staging/dt3155v4l/dt3155-bufs.h @@ -0,0 +1,88 @@ +/*************************************************************************** + * Copyright (C) 2006-2010 by Marin Mitov * + * mitov@issp.bas.bg * + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + * This program is distributed in the hope that it will be useful, * + * but WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * + * GNU General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * + ***************************************************************************/ + +#ifndef _DT3155_BUFS_H_ +#define _DT3155_BUFS_H_ + +#include <linux/pci.h> + +/* 4 chunks of 4MB, 9 buffers each = 36 buffers (> VIDEO_MAX_FRAME) */ +#define DT3155_CHUNK_NUM 4 + +/* DT3155_CHUNK_SIZE should be 4M (2^22) or less, but more than image size */ +#define DT3155_CHUNK_SIZE (1U << 22) +#define DT3155_CHUNK_FLAGS (GFP_KERNEL | GFP_DMA32 | __GFP_COLD | __GFP_NOWARN) + +/* DT3155_BUF_SIZE = 108 * PAGE_SIZE, so each buf is PAGE_SIZE alligned */ +#define DT3155_BUF_SIZE (768 * 576) + +/** + * struct dt3155_buf - image buffer structure + * + * @cpu: virtual kernel address of the buffer + * @dma: dma (bus) address of the buffer + * @next: pointer to the next buffer in the fifo + * @tv: time value when the image has been acquired + */ +struct dt3155_buf { + void *cpu; + dma_addr_t dma; + struct dt3155_buf *next; + struct timeval tv; +}; + +/** + * struct dt3155_fifo - fifo structure + * + * @head: pointer to the head of the fifo + * @tail: pionter to the tail of the fifo + * @lock: spin_lock to protect the fifo + */ +struct dt3155_fifo { + struct dt3155_buf *head; + struct dt3155_buf *tail; + spinlock_t lock; +}; + +struct dt3155_buf * __must_check +dt3155_init_chunks_buf(void); +void +dt3155_free_chunks_buf(struct dt3155_buf *buf); + +struct dt3155_fifo * __must_check +dt3155_init_fifo(void); +#define dt3155_free_fifo(x) kfree(x) + +struct dt3155_buf * __must_check +dt3155_get_buf(struct dt3155_fifo *fifo); +void +dt3155_put_buf(struct dt3155_buf *buf, struct dt3155_fifo *fifo); + +struct dt3155_fifo * __must_check +dt3155_init_chunks_fifo(void); +void +dt3155_free_chunks_fifo(struct dt3155_fifo *chunks); + +struct dt3155_fifo * __must_check +dt3155_init_ibufs_fifo(struct dt3155_fifo *chunks, int buf_size); +void +dt3155_free_ibufs_fifo(struct dt3155_fifo *fifo); + +#endif /* _DT3155_BUFS_H_ */ |