FreeBSD/Linux Kernel Cross Reference
sys/dev/isa/if_elreg.h

     /*      $OpenBSD: if_elreg.h,v 1.3 2022/01/09 05:42:44 jsg Exp $        */
     /*      $NetBSD: if_elreg.h,v 1.4 1994/10/27 04:17:29 cgd Exp $ */
     
     /*
      * Copyright (c) 1994, Matthew E. Kimmel.  Permission is hereby granted
      * to use, copy, modify and distribute this software provided that both
      * the copyright notice and this permission notice appear in all copies
      * of the software, derivative works or modified versions, and any
      * portions thereof.
     */
    
    /*
     * 3COM Etherlink 3C501 Register Definitions
     */
    
    /*
     * I/O Ports
     */
    #define EL_RXS          0x6     /* Receive status register */
    #define EL_RXC          0x6     /* Receive command register */
    #define EL_TXS          0x7     /* Transmit status register */
    #define EL_TXC          0x7     /* Transmit command register */
    #define EL_GPBL         0x8     /* GP buffer ptr low byte */
    #define EL_GPBH         0x9     /* GP buffer ptr high byte */
    #define EL_RBL          0xa     /* Receive buffer ptr low byte */
    #define EL_RBC          0xa     /* Receive buffer clear */
    #define EL_RBH          0xb     /* Receive buffer ptr high byte */
    #define EL_EAW          0xc     /* Ethernet address window */
    #define EL_AS           0xe     /* Auxiliary status register */
    #define EL_AC           0xe     /* Auxiliary command register */
    #define EL_BUF          0xf     /* Data buffer */
    
    /* Receive status register bits */
    #define EL_RXS_OFLOW    0x01    /* Overflow error */
    #define EL_RXS_FCS      0x02    /* FCS error */
    #define EL_RXS_DRIB     0x04    /* Dribble error */
    #define EL_RXS_SHORT    0x08    /* Short frame */
    #define EL_RXS_NOFLOW   0x10    /* No overflow */
    #define EL_RXS_GOOD     0x20    /* Received good frame */
    #define EL_RXS_STALE    0x80    /* Stale receive status */
    
    /* Receive command register bits */
    #define EL_RXC_DISABLE  0x00    /* Receiver disabled */
    #define EL_RXC_DOFLOW   0x01    /* Detect overflow */
    #define EL_RXC_DFCS     0x02    /* Detect FCS errs */
    #define EL_RXC_DDRIB    0x04    /* Detect dribble errors */
    #define EL_RXC_DSHORT   0x08    /* Detect short frames */
    #define EL_RXC_DNOFLOW  0x10    /* Detect frames w/o overflow ??? */
    #define EL_RXC_AGF      0x20    /* Accept Good Frames */
    #define EL_RXC_PROMISC  0x40    /* Promiscuous mode */
    #define EL_RXC_ABROAD   0x80    /* Accept address, broadcast */
    #define EL_RXC_AMULTI   0xc0    /* Accept address, multicast */
    
    /* Transmit status register bits */
    #define EL_TXS_UFLOW    0x01    /* Underflow */
    #define EL_TXS_COLL     0x02    /* Collision */
    #define EL_TXS_COLL16   0x04    /* Collision 16 */
    #define EL_TXS_READY    0x08    /* Ready for new frame */
    
    /* Transmit command register bits */
    #define EL_TXC_DUFLOW   0x01    /* Detect underflow */
    #define EL_TXC_DCOLL    0x02    /* Detect collisions */
    #define EL_TXC_DCOLL16  0x04    /* Detect collision 16 */
    #define EL_TXC_DSUCCESS 0x08    /* Detect success */
    
    /* Auxiliary status register bits */
    #define EL_AS_RXBUSY    0x01    /* Receive busy */
    #define EL_AS_DMADONE   0x10    /* DMA finished */
    #define EL_AS_TXBUSY    0x80    /* Transmit busy */
    
    /* Auxiliary command register bits */
    #define EL_AC_HOST      0x00    /* System bus can access buffer */
    #define EL_AC_IRQE      0x01    /* IRQ enable */
    #define EL_AC_TXBAD     0x02    /* Transmit frames with bad FCS */
    #define EL_AC_TXFRX     0x04    /* Transmit followed by receive */
    #define EL_AC_RX        0x08    /* Receive */
    #define EL_AC_LB        0x0c    /* Loopback */
    #define EL_AC_DRQ       0x20    /* DMA request */
    #define EL_AC_RIDE      0x40    /* DRQ and IRQ enabled */
    #define EL_AC_RESET     0x80    /* Reset */
    
    /* Packet buffer size */
    #define EL_BUFSIZ       2048

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