os/linux-2.6-tag--devboard-R2_10-4/arch/cris/arch-v32/drivers/elphel/circbuf.h

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// FILE NAME  : cxsdma.h
// read/write image and FPN buffers from SDRAM

#include <linux/poll.h>

int          circbuf_all_open  (struct inode *inode,  struct file *filp); // set filesize
int          circbuf_all_release(struct inode *inode, struct file *filp);
loff_t       circbuf_all_lseek (struct file * file,   loff_t offset, int orig);
ssize_t      circbuf_all_write (struct file * file,   const char * buf, size_t count, loff_t *off);
ssize_t      circbuf_all_read  (struct file * file,   char * buf, size_t count, loff_t *off);
int          circbuf_all_mmap  (struct file *file,    struct vm_area_struct *vma);
unsigned int circbuf_all_poll  (struct file *file,    poll_table *wait);
int          circbuf_all_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);



int          circbuf_open  (struct inode *inode, struct file *filp); // set filesize
loff_t       circbuf_lseek (struct file * file, loff_t offset, int orig);
ssize_t      circbuf_write (struct file * file, const char * buf, size_t count, loff_t *off);
ssize_t      circbuf_read  (struct file * file, char * buf, size_t count, loff_t *off);
int          circbuf_mmap  (struct file *file, struct vm_area_struct *vma);
unsigned int circbuf_poll  (struct file *file,    poll_table *wait);

int     jpeghead_open (struct inode *inode, struct file *filp); // set filesize
loff_t  jpeghead_lseek(struct file * file, loff_t offset, int orig);
ssize_t jpeghead_read (struct file * file, char * buf, size_t count, loff_t *off);
ssize_t jpeghead_write(struct file * file, const char * buf, size_t count, loff_t *off);

extern unsigned long  * ccam_dma_buf_ptr;
void init_ccam_dma_buf_ptr(void);
extern wait_queue_head_t circbuf_wait_queue;


#define X313_CHAIN_SIGNATURE  0xffffffff
#define X313_CHAIN_SIGNATURE4 0xffff0000
//#define X313_CHAIN_SIGNATURE4 0xffffffff
#define X313_LENGTH_MASK      0xff000000

#define X313_PADDED_FRAME(x)((((x)+67+CCAM_MMAP_META ) >>2) & 0xfffffff8)
#define X313_BUFFSUB(x,y) (((x)>=(y))? ((x)-(y)) : ((x)+ (CCAM_DMA_SIZE-(y))))
#define X313_BUFFADD(x,y) ((((x) + (y))<=CCAM_DMA_SIZE)? ((x) + (y)) : ((x) - (CCAM_DMA_SIZE-(y))))

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