at91_spi.h

AT91RM9200的SPI驱动（LINUX2.4内核）

/*
 *  AT91RM9200 SPI 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_SPI
#define AT91_SPI

#define AT91_SPI_MAJOR 60	/* in the local range, experimental */
#define AT91C_SPI_DEFAULT_BUAD 1200000  /* default baud rate */
#define AT91C_SPI_DELAY_BEFORE_SCK 16

struct spi_packet {
	unsigned int us_pr;	/* Transmit/Receive Pointer Register copy */
	unsigned int us_cr;	/* Transmit/Receive Counter Register copy */
};

#define AT91_SPI_MAX_PACKET_SZ 10000	/* in bytes per write */

/* the number of pages we need to queue per write */
#define AT91_SPI_MAX_PAGES ((((PAGE_SIZE * 2) - 2 + AT91_SPI_MAX_PACKET_SZ) / PAGE_SIZE) + 2)

struct spi_frame
  {
  struct spi_packet packet[AT91_SPI_MAX_PAGES];
  struct spi_packet *p_head;
  struct spi_packet *p_tail_int;
  wait_queue_head_t waitqueue;	/* wait queue for read/write to complete */
  struct kiobuf *kiobuf;		/* 1 kiobuf for each receive/xmit */
  spinlock_t lock1;		/* some spinlocks for saving/restoring interrupt levels */
  };

/* the following frame is queued for transmission every 120 Hz.  Every "otherN"
 introduces a 960 Hz delay.  This causes ECG + BP to output at a 480 Hz rate */
struct spi_ana_out_frame  /* one 120 Hz packet to spi devices */
  {
  unsigned int ecg1;  /* PCS1 */
  unsigned int other1;  /* PCS3 */
  unsigned int bp1;  /* PCS1 */
  unsigned int other2;  /* PCS3 */
  unsigned int ecg2;  /* PCS1 */
  unsigned int other3;  /* PCS3 */
  unsigned int bp2;  /* PCS1 */
  unsigned int other4;  /* PCS3 */
  unsigned int ecg3;  /* PCS1 */
  unsigned int other5;  /* PCS3 */
  unsigned int bp3;  /* PCS1 */
  unsigned int other6;  /* PCS3 */
  unsigned int ecg4;  /* PCS1 */
  unsigned int other7;  /* PCS3 */
  unsigned int bp4;  /* PCS1 */
#define AT91_SPI_OTHER_MAX 50 /* the max number of spi values to other than ana out devices */
  unsigned int other[AT91_SPI_OTHER_MAX];
  };

struct spi_local
  {
  int flags;  /* flags as follows: */
#define AT91_SPI_IOCTL_MODE 1  /* we're in the ioctl mode of usart */
#define AT91_SPI_DO_READ 2  /* flag to do the read of SPI */
  AT91PS_SPI pSpi;		/* base address of SPI */
  int irq;			/* interrupt number for this SPI */
  struct spi_frame tx;
    int other_send_cnt;  /* how many bytes to send of other, used as flag also */
    int other_pcs;  /* what PCS to use for this one */
  struct spi_ana_out_frame spi_ao_packet;
  };
extern struct spi_local at92_spi_priv;  /* so combined usart/spi driver can get to us */

#endif