drivers/staging/dt3155v4l/dt3155-bufs.h

   1 /***************************************************************************
   2  *   Copyright (C) 2006-2010 by Marin Mitov                                *
   3  *   mitov@issp.bas.bg                                                     *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 #ifndef _DT3155_BUFS_H_
  22 #define _DT3155_BUFS_H_
  23
  24 #include <linux/pci.h>
  25
  26 /* 4 chunks of 4MB, 9 buffers each = 36 buffers (> VIDEO_MAX_FRAME) */
  27 #define DT3155_CHUNK_NUM 4
  28
  29 /* DT3155_CHUNK_SIZE should be 4M (2^22) or less, but more than image size */
  30 #define DT3155_CHUNK_SIZE (1U << 22)
  31 #define DT3155_CHUNK_FLAGS (GFP_KERNEL | GFP_DMA32 | __GFP_COLD | __GFP_NOWARN)
  32
  33 /* DT3155_BUF_SIZE = 108 * PAGE_SIZE, so each buf is PAGE_SIZE alligned  */
  34 #define DT3155_BUF_SIZE (768 * 576)
  35
  36 /**
  37  * struct dt3155_buf - image buffer structure
  38  *
  39  * @cpu:        virtual kernel address of the buffer
  40  * @dma:        dma (bus) address of the buffer
  41  * @next:       pointer to the next buffer in the fifo
  42  * @tv:         time value when the image has been acquired
  43  */
  44 struct dt3155_buf {
  45         void *cpu;
  46         dma_addr_t dma;
  47         struct dt3155_buf *next;
  48         struct timeval tv;
  49 };
  50
  51 /**
  52  * struct dt3155_fifo - fifo structure
  53  *
  54  * @head:       pointer to the head of the fifo
  55  * @tail:       pionter to the tail of the fifo
  56  * @lock:       spin_lock to protect the fifo
  57  */
  58 struct dt3155_fifo {
  59         struct dt3155_buf *head;
  60         struct dt3155_buf *tail;
  61         spinlock_t lock;
  62 };
  63
  64 struct dt3155_buf * __must_check
  65 dt3155_init_chunks_buf(void);
  66 void
  67 dt3155_free_chunks_buf(struct dt3155_buf *buf);
  68
  69 struct dt3155_fifo * __must_check
  70 dt3155_init_fifo(void);
  71 #define dt3155_free_fifo(x) kfree(x)
  72
  73 struct dt3155_buf * __must_check
  74 dt3155_get_buf(struct dt3155_fifo *fifo);
  75 void
  76 dt3155_put_buf(struct dt3155_buf *buf, struct dt3155_fifo *fifo);
  77
  78 struct dt3155_fifo * __must_check
  79 dt3155_init_chunks_fifo(void);
  80 void
  81 dt3155_free_chunks_fifo(struct dt3155_fifo *chunks);
  82
  83 struct dt3155_fifo * __must_check
  84 dt3155_init_ibufs_fifo(struct dt3155_fifo *chunks, int buf_size);
  85 void
  86 dt3155_free_ibufs_fifo(struct dt3155_fifo *fifo);
  87
  88 #endif /*  _DT3155_BUFS_H_  */