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/***************************************************************************
* 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_ */
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