/* SPDX-License-Identifier: GPL-2.0 */

  /* $Id: scc.h,v 1.29 1997/04/02 14:56:45 jreuter Exp jreuter $ */

  #ifndef	_SCC_H
  #define	_SCC_H

  #include <uapi/linux/scc.h>

  
  enum {TX_OFF, TX_ON};	/* command for scc_key_trx() */
  
  /* Vector masks in RR2B */
  
  #define VECTOR_MASK	0x06
  #define TXINT		0x00
  #define EXINT		0x02
  #define RXINT		0x04
  #define SPINT		0x06
  
  #ifdef CONFIG_SCC_DELAY
  #define Inb(port)	inb_p(port)
  #define Outb(port, val)	outb_p(val, port)
  #else
  #define Inb(port)	inb(port)
  #define Outb(port, val)	outb(val, port)
  #endif
  
  /* SCC channel control structure for KISS */
  
  struct scc_kiss {
  	unsigned char txdelay;		/* Transmit Delay 10 ms/cnt */
  	unsigned char persist;		/* Persistence (0-255) as a % */
  	unsigned char slottime;		/* Delay to wait on persistence hit */
  	unsigned char tailtime;		/* Delay after last byte written */
  	unsigned char fulldup;		/* Full Duplex mode 0=CSMA 1=DUP 2=ALWAYS KEYED */
  	unsigned char waittime;		/* Waittime before any transmit attempt */
  	unsigned int  maxkeyup;		/* Maximum time to transmit (seconds) */
  	unsigned int  mintime;		/* Minimal offtime after MAXKEYUP timeout (seconds) */
  	unsigned int  idletime;		/* Maximum idle time in ALWAYS KEYED mode (seconds) */
  	unsigned int  maxdefer;		/* Timer for CSMA channel busy limit */
  	unsigned char tx_inhibit;	/* Transmit is not allowed when set */	
  	unsigned char group;		/* Group ID for AX.25 TX interlocking */
  	unsigned char mode;		/* 'normal' or 'hwctrl' mode (unused) */
  	unsigned char softdcd;		/* Use DPLL instead of DCD pin for carrier detect */
  };
  
  
  /* SCC channel structure */
  
  struct scc_channel {
  	int init;			/* channel exists? */
  
  	struct net_device *dev;		/* link to device control structure */
  	struct net_device_stats dev_stat;/* device statistics */
  
  	char brand;			/* manufacturer of the board */
  	long clock;			/* used clock */
  
  	io_port ctrl;			/* I/O address of CONTROL register */
  	io_port	data;			/* I/O address of DATA register */
  	io_port special;		/* I/O address of special function port */
  	int irq;			/* Number of Interrupt */
  
  	char option;
  	char enhanced;			/* Enhanced SCC support */
  
  	unsigned char wreg[16]; 	/* Copy of last written value in WRx */
  	unsigned char status;		/* Copy of R0 at last external interrupt */
  	unsigned char dcd;		/* DCD status */
  
          struct scc_kiss kiss;		/* control structure for KISS params */
          struct scc_stat stat;		/* statistical information */
          struct scc_modem modem; 	/* modem information */
  
          struct sk_buff_head tx_queue;	/* next tx buffer */
          struct sk_buff *rx_buff;	/* pointer to frame currently received */
          struct sk_buff *tx_buff;	/* pointer to frame currently transmitted */
  
  	/* Timer */
  	struct timer_list tx_t;		/* tx timer for this channel */
  	struct timer_list tx_wdog;	/* tx watchdogs */
  	
  	/* Channel lock */
  	spinlock_t	lock;		/* Channel guard lock */
  };

  #endif /* defined(_SCC_H) */