at91_usart.h

AT91RM9200的定时器驱动(linux2.4内核）

/*
 *  AT91RM9200 USART driver for use for high speed packet sending/receiving
 *
 *		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.
 */

#ifndef AT91_USART
#define AT91_USART

#include "pmla.h"  /* poor man's logic analyzer */

struct usart_packet
  {
  unsigned int us_pr;  /* Transmit/Receive Pointer Register copy */
  unsigned int us_cr;  /* Transmit/Receive Counter Register copy */
};
#define AT91_USART_SPEED 3686400  /* in bits per second */
#define AT91_USART_MAX_PACKET_SZ (AT91_USART_SPEED / 10)  /* in bytes per second */
/* the number of pages we need to que per read/write */
#define AT91_USART_MAX_PAGES ((((PAGE_SIZE * 2) - 2 + AT91_USART_MAX_PACKET_SZ) / PAGE_SIZE) + 2)
/* Calculation of time-out duration: (US_RTOR Value) * (Bit Period) */
#define AT91_USART_RX_TIMEOUT (5 * 10)  /* 5 bytes @ 10 bits/byte */
struct usart_frame
  {
  struct usart_packet packet[AT91_USART_MAX_PAGES];
  struct usart_packet *p_head;
  struct usart_packet *p_tail_int;
  wait_queue_head_t waitque;  /* wait que for read/write to complete */
  struct kiobuf *kiobuf;  /* 1 kiobuf for each receive/xmit */
  spinlock_t lock1;  /* some spinlocks for saving/restoring interrupt levels */
  };
struct usart_local
  {
  AT91PS_USART pUsart;  /* base address of USART */
  int irq;  /* interrupt number for this USART */
  AT91PS_TC pTc;  /* base address of PERFTEST */
  int irq2;  /* interrupt number for this PERFTEST */
  struct usart_frame rx;
  int rx_cntr;  /* count how many char's actually received before timeout */
  struct usart_frame tx;
//  spinlock_t lock1;  /* some spinlocks for saving/restoring interrupt levels */
  PMLA pmla;  /* software logic analyzer */
    ulong time1;  /* time stamp1 */
    ulong time2;  /* time stamp1 */
    ulong elapsed_time1;  /* time stamp1 */
    ulong jitter_time1;  /* time stamp1 */
};
#endif