i82586var.h

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*  $NetBSD: i82586var.h,v 1.15 2001/01/22 22:28:45 bjh21 Exp $  */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Paul Kranenburg and Charles M. Hannum.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*-
 * Copyright (c) 1992, 1993, University of Vermont and State
 *  Agricultural College.
 * Copyright (c) 1992, 1993, Garrett A. Wollman.
 *
 * Portions:
 * Copyright (c) 1994, 1995, Rafal K. Boni
 * Copyright (c) 1990, 1991, William F. Jolitz
 * Copyright (c) 1990, The Regents of the University of California
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the University of Vermont
 *  and State Agricultural College and Garrett A. Wollman, by William F.
 *  Jolitz, and by the University of California, Berkeley, Lawrence
 *  Berkeley Laboratory, and its contributors.
 * 4. Neither the names of the Universities nor the names of the authors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR AUTHORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Intel 82586 Ethernet chip
 * Register, bit, and structure definitions.
 *
 * Original StarLAN driver written by Garrett Wollman with reference to the
 * Clarkson Packet Driver code for this chip written by Russ Nelson and others.
 *
 * BPF support code taken from hpdev/if_le.c, supplied with tcpdump.
 *
 * 3C507 support is loosely based on code donated to NetBSD by Rafal Boni.
 *
 * Majorly cleaned up and 3C507 code merged by Charles Hannum.
 *
 * Converted to SUN ie driver by Charles D. Cranor,
 *    October 1994, January 1995.
 * This sun version based on i386 version 1.30.
 */

#ifndef I82586_DEBUG
#define I82586_DEBUG 0
#endif

/* Debug elements */
#define IED_RINT       0x01
#define IED_TINT       0x02
#define IED_RNR        0x04
#define IED_CNA        0x08
#define IED_READFRAME  0x10
#define IED_ENQ        0x20
#define IED_XMIT       0x40
#define IED_ALL        0x7f

#define B_PER_F        3    /* recv buffers per frame */
#define  IE_RBUF_SIZE  256  /* size of each receive buffer;
                               MUST BE POWER OF TWO */
#define  NTXBUF        2    /* number of transmit commands */
#define  IE_TBUF_SIZE  ETHER_MAX_LEN  /* length of transmit buffer */

#define IE_MAXMCAST  (IE_TBUF_SIZE/6)/* must fit in transmit buffer */


#define INTR_ENTER  0    /* intr hook called on ISR entry */
#define INTR_EXIT   1    /* intr hook called on ISR exit */
#define INTR_LOOP   2    /* intr hook called on ISR loop */
#define INTR_ACK    3    /* intr hook called on ie_ack */

#define CHIP_PROBE  0    /* reset called from chip probe */
#define CARD_RESET  1    /* reset called from card reset */

#if I82586_DEBUG
#define I82586_INTS_REQ   0
#define I82586_INTS_IN    1
#define I82586_INTS_LOOPS 2
#define I82586_INTS_OUT   3
#define I82586_RX_INT     4
#define I82586_RX_DROP    5
#define I82586_RX_ERR     6
#define I82586_RX_OK      7
#define I82586_RX_START   8
#define I82586_START_TX   9
#define I82586_TX_START   10
#define I82586_TX_INT     11
#define I82586_TX_REQ     12
#define I82586_TX_EVT     13
#define I82586_TX_EMIT    14
#define I82586_TX_BAD     15
#define I82586_TX_ACTIVE  16
#define I82586_TRACE_CNT  17

#define I82586_TRACE_FLOW (10000)
#endif

/*
 * Ethernet status, per interface.
 *
 * The chip uses two types of pointers: 16 bit and 24 bit
 *   24 bit pointers cover the board's memory.
 *   16 bit pointers are offsets from the ISCP's `ie_base'
 *
 * The board's memory is represented by the bus handle `bh'. The MI
 * i82586 driver deals exclusively with offsets relative to the
 * board memory bus handle. The `ie_softc' fields below that are marked
 * `MD' are in the domain of the front-end driver; they opaque to the
 * MI driver part.
 *
 * The front-end is required to manage the SCP and ISCP structures. i.e.
 * allocate room for them on the board's memory, and arrange to point the
 * chip at the SCB stucture, the offset of which is passed to the MI
 * driver in `sc_scb'.
 *
 * The following functions provide the glue necessary to deal with
 * host and bus idiosyncracies:
 *
 *  hwreset    - board reset
 *  hwinit    - board initialization
 *  chan_attn  - get chip to look at prepared commands
 *  intrhook  - board dependent interrupt processing
 *
 *  All of the following shared-memory access function use an offset
 *  relative to the bus handle to indicate the shared memory location.
 *  The bus_{read/write}N function take or return offset into the
 *  shared memory in the host's byte-order.
 *
 *  memcopyin  - copy device memory: board to KVA
 *  memcopyout  - copy device memory: KVA to board
 *  bus_read16  - read a 16-bit i82586 pointer
        `offset' argument will be 16-bit aligned
 *  bus_write16  - write a 16-bit i82586 pointer
        `offset' argument will be 16-bit aligned
 *  bus_write24  - write a 24-bit i82586 pointer
        `offset' argument will be 32-bit aligned
 *  bus_barrier  - perform a bus barrier operation, forcing
        all outstanding reads/writes to complete
 *
 */

struct ie_softc {
  struct arpcom arpcom;

  /*
   * For RTEMS we run the tx and rx handlers under a task due to the 
   * network semaphore stuff.
   */

  rtems_id intr_task;
  rtems_id tx_task;

  void  *sc_iobase;  /* (MD) KVA of base of 24 bit addr space */
  void  *sc_maddr;   /* (MD) KVA of base of chip's RAM
                            (16bit addr space) */
  u_int sc_msize;    /* (MD) how much RAM we have/use */

  /* Bus glue */
  void (*hwreset) (struct ie_softc *, int);
  void (*hwinit) (struct ie_softc *);
  void (*chan_attn) (struct ie_softc *, int);
  int  (*intrhook) (struct ie_softc *, int where);

  void (*memcopyin) (struct ie_softc *, void *, int, size_t);
  void (*memcopyout) (struct ie_softc *, const void *,
                      int, size_t);
  u_int16_t (*ie_bus_read16) (struct ie_softc *, int offset);
  void  (*ie_bus_write16) (struct ie_softc *, int offset,
                           u_int16_t value);
  void  (*ie_bus_write24) (struct ie_softc *, int offset,
                           int addr);
  void  (*ie_bus_barrier) (struct ie_softc *, int offset, 
                           int length, int flags);

  /* Media management */
  int  (*sc_mediachange) (struct ie_softc *);
  /* card dependent media change */
  void (*sc_mediastatus) (struct ie_softc *, struct ifmediareq *);
  /* card dependent media status */

  /*
   * Offsets (relative to bus handle) of the i82586 SYSTEM structures.
   */
  int  scp;    /* Offset to the SCP (set by front-end) */
  int  iscp;   /* Offset to the ISCP (set by front-end) */
  int  scb;    /* Offset to SCB (set by front-end) */

  /*
   * Offset and size of a block of board memory where the buffers
   * are to be allocated from (initialized by front-end).
   */
  int  buf_area;            /* Start of descriptors and buffers */
  int  buf_area_sz;         /* Size of above */

  /*
   * The buffers & descriptors (recv and xmit)
   */
  int  rframes;           /* Offset to `nrxbuf' frame descriptors */
  int  rbds;              /* Offset to `nrxbuf' buffer descriptors */
  int  rbufs;             /* Offset to `nrxbuf' receive buffers */
#define IE_RBUF_ADDR(sc, i)  (sc->rbufs + ((i) * IE_RBUF_SIZE))
  int  rfhead, rftail;
  int  rbhead, rbtail;
  int  nframes;           /* number of frames in use */
  int  nrxbuf;            /* number of recv buffs in use */
  int  rnr_expect;        /* XXX - expect a RCVR not ready interrupt */

  int  nop_cmds;          /* Offset to NTXBUF no-op commands */
  int  xmit_cmds;         /* Offset to NTXBUF transmit commands */
  int  xbds;              /* Offset to NTXBUF buffer descriptors */
  int  xbufs;             /* Offset to NTXBUF transmit buffers */
#define IE_XBUF_ADDR(sc, i)  (sc->xbufs + ((i) * IE_TBUF_SIZE))

  int  xchead, xctail;
  int  xmit_busy;
  int  do_xmitnopchain;   /* Controls use of xmit NOP chains */
  int  xmit_req;

  /* Multicast addresses */
  char *mcast_addrs;      /* Current MC filter addresses */
  int  mcast_addrs_size;  /* Current size of MC buffer */
  int  mcast_count;       /* Current # of addrs in buffer */
  int  want_mcsetup;      /* run mcsetup at next opportunity */

  int  promisc;           /* are we in promisc mode? */
  int  async_cmd_inprogress;  /* we didn't wait for 586 to accept
                                 a command */

#if I82586_DEBUG
#define I82586_TRACE(s, e, d) \
do { rtems_interrupt_level level; rtems_interrupt_disable (level); \
     (s)->trace_flow[(s)->trace_flow_in++] = (e); \
     (s)->trace_flow[(s)->trace_flow_in++] = (unsigned int)(d); \
     if ((s)->trace_flow_in >= I82586_TRACE_FLOW) { \
       (s)->trace_flow_in = 0; \
       (s)->trace_flow_wrap = 1; \
     } \
     rtems_interrupt_enable (level); \
   } while (0)

  int          sc_debug;
  unsigned int trace_flow[I82586_TRACE_FLOW * 2];
  unsigned int trace_flow_wrap;  
#endif
  unsigned int trace_flow_in;  
};

/* Exported functions */
rtems_isr i82586_intr (rtems_vector_number , void *);
int       i82586_proberam (struct ie_softc *);
int       i82586_attach (struct rtems_bsdnet_ifconfig *config, int attaching);

/* Shortcut macros to optional (driver uses default if unspecified) callbacks */
#define xIE_BUS_BARRIER(sc, offset, length, flags)        \
do {                         \
  if ((sc)->ie_bus_barrier)             \
    ((sc)->ie_bus_barrier)((sc), (offset), (length), (flags));\
  else                   \
    bus_space_barrier((sc)->bt, (sc)->bh, (offset), (length), \
                      (flags)); \
} while (0)

#define IE_BUS_BARRIER(sc, offset, length, flags)