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/* eth.h -- Simulation of Ethernet MAC header
 
   Copyright (C) 2001 Erez Volk, erez@mailandnews.comopencores.org
   Copyright (C) 2008 Embecosm Limited
 
   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
 
   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 3 of the License, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   more details.
 
   You should have received a copy of the GNU General Public License along
   with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen. */
 
 
#ifndef ETH__H
#define ETH__H
 
#if HAVE_ETH_PHY
#include <netpacket/packet.h>
#endif /* HAVE_ETH_PHY */
 
#if HAVE_NET_ETHERNET_H
# include <net/ethernet.h>
#elif defined(HAVE_SYS_ETHERNET_H)
# include <sys/ethernet.h>
#else /* !HAVE_NET_ETHERNET_H && !HAVE_SYS_ETHERNET_H - */
#include <sys/types.h>
#endif
 
/* Address space required by one Ethernet MAC */
#define ETH_ADDR_SPACE 0x1000
 
/* Relative Register Addresses */
#define ETH_MODER	(4 * 0x00)
#define ETH_INT_SOURCE	(4 * 0x01)
#define ETH_INT_MASK	(4 * 0x02)
#define ETH_IPGT	(4 * 0x03)
#define ETH_IPGR1	(4 * 0x04)
#define ETH_IPGR2	(4 * 0x05)
#define ETH_PACKETLEN	(4 * 0x06)
#define ETH_COLLCONF	(4 * 0x07)
#define ETH_TX_BD_NUM	(4 * 0x08)
#define ETH_CTRLMODER	(4 * 0x09)
#define ETH_MIIMODER	(4 * 0x0A)
#define ETH_MIICOMMAND	(4 * 0x0B)
#define ETH_MIIADDRESS	(4 * 0x0C)
#define ETH_MIITX_DATA	(4 * 0x0D)
#define ETH_MIIRX_DATA	(4 * 0x0E)
#define ETH_MIISTATUS	(4 * 0x0F)
#define ETH_MAC_ADDR0	(4 * 0x10)
#define ETH_MAC_ADDR1	(4 * 0x11)
#define ETH_HASH0	(4 * 0x12)
#define ETH_HASH1	(4 * 0x13)
 
/* Where BD's are stored */
#define ETH_BD_BASE        0x400
#define ETH_BD_COUNT       0x100
#define ETH_BD_SPACE       (4 * ETH_BD_COUNT)
 
/* Where to point DMA to transmit/receive */
#define ETH_DMA_RX_TX      0x800
 
/* Field definitions for MODER */
#define ETH_MODER_DMAEN_OFFSET     17
#define ETH_MODER_RECSMALL_OFFSET  16
#define ETH_MODER_PAD_OFFSET       15
#define ETH_MODER_HUGEN_OFFSET     14
#define ETH_MODER_CRCEN_OFFSET     13
#define ETH_MODER_DLYCRCEN_OFFSET  12
#define ETH_MODER_RST_OFFSET       11
#define ETH_MODER_FULLD_OFFSET     10
#define ETH_MODER_EXDFREN_OFFSET   9
#define ETH_MODER_NOBCKOF_OFFSET   8
#define ETH_MODER_LOOPBCK_OFFSET   7
#define ETH_MODER_IFG_OFFSET	   6
#define ETH_MODER_PRO_OFFSET       5
#define ETH_MODER_IAM_OFFSET       4
#define ETH_MODER_BRO_OFFSET       3
#define ETH_MODER_NOPRE_OFFSET     2
#define ETH_MODER_TXEN_OFFSET      1
#define ETH_MODER_RXEN_OFFSET      0
 
/* Field definitions for INT_SOURCE */
#define ETH_INT_SOURCE_RXC_OFFSET  6
#define ETH_INT_SOURCE_TXC_OFFSET  5
#define ETH_INT_SOURCE_BUSY_OFFSET 4
#define ETH_INT_SOURCE_RXE_OFFSET  3
#define ETH_INT_SOURCE_RXB_OFFSET  2
#define ETH_INT_SOURCE_TXE_OFFSET  1
#define ETH_INT_SOURCE_TXB_OFFSET  0
 
/* Field definitions for INT_MASK */
#define ETH_INT_MASK_RXC_M_OFFSET  6
#define ETH_INT_MASK_TXC_M_OFFSET  5
#define ETH_INT_MASK_BUSY_M_OFFSET 4
#define ETH_INT_MASK_RXE_M_OFFSET  3
#define ETH_INT_MASK_RXB_M_OFFSET  2
#define ETH_INT_MASK_TXE_M_OFFSET  1
#define ETH_INT_MASK_TXB_M_OFFSET  0
 
/* Field definitions for PACKETLEN */
#define ETH_PACKETLEN_MINFL_OFFSET 16
#define ETH_PACKETLEN_MINFL_WIDTH  16
#define ETH_PACKETLEN_MAXFL_OFFSET 0
#define ETH_PACKETLEN_MAXFL_WIDTH  16
 
/* Field definitions for COLLCONF */
#define ETH_COLLCONF_MAXRET_OFFSET 16
#define ETH_COLLCONF_MAXRET_WIDTH  4
#define ETH_COLLCONF_COLLVALID_OFFSET 0
#define ETH_COLLCONF_COLLVALID_WIDTH  6
 
/* Field definitions for CTRLMODER */
#define ETH_CMODER_TXFLOW_OFFSET   2
#define ETH_CMODER_RXFLOW_OFFSET   1
#define ETH_CMODER_PASSALL_OFFSET  0
 
/* Field definitions for MIIMODER */
#define ETH_MIIMODER_MRST_OFFSET   9
#define ETH_MIIMODER_NOPRE_OFFSET  8
#define ETH_MIIMODER_CLKDIV_OFFSET 0
#define ETH_MIIMODER_CLKDIV_WIDTH  8
 
/* Field definitions for MIICOMMAND */
#define ETH_MIICOMM_WCDATA_OFFSET  2
#define ETH_MIICOMM_RSTAT_OFFSET   1
#define ETH_MIICOMM_SCANS_OFFSET   0
 
/* Field definitions for MIIADDRESS */
#define ETH_MIIADDR_RGAD_OFFSET	   8
#define ETH_MIIADDR_RGAD_WIDTH     5
#define ETH_MIIADDR_FIAD_OFFSET    0
#define ETH_MIIADDR_FIAD_WIDTH     5
 
/* Field definitions for MIISTATUS */
#define ETH_MIISTAT_NVALID_OFFSET  1
#define ETH_MIISTAT_BUSY_OFFSET    1
#define ETH_MIISTAT_FAIL_OFFSET    0
 
/* Field definitions for TX buffer descriptors */
#define ETH_TX_BD_LENGTH_OFFSET        16
#define ETH_TX_BD_LENGTH_WIDTH         16
#define ETH_TX_BD_READY_OFFSET         15
#define ETH_TX_BD_IRQ_OFFSET           14
#define ETH_TX_BD_WRAP_OFFSET          13
#define ETH_TX_BD_PAD_OFFSET           12
#define ETH_TX_BD_CRC_OFFSET           11
#define ETH_TX_BD_LAST_OFFSET          10
#define ETH_TX_BD_PAUSE_OFFSET         9
#define ETH_TX_BD_UNDERRUN_OFFSET      8
#define ETH_TX_BD_RETRY_OFFSET         4
#define ETH_TX_BD_RETRY_WIDTH          4
#define ETH_TX_BD_RETRANSMIT_OFFSET    3
#define ETH_TX_BD_COLLISION_OFFSET     2
#define ETH_TX_BD_DEFER_OFFSET         1
#define ETH_TX_BD_NO_CARRIER_OFFSET    0
 
 
/* Field definitions for RX buffer descriptors */
#define ETH_RX_BD_LENGTH_OFFSET        16
#define ETH_RX_BD_LENGTH_WIDTH         16
#define ETH_RX_BD_READY_OFFSET         15
#define ETH_RX_BD_IRQ_OFFSET           14
#define ETH_RX_BD_WRAP_OFFSET          13
#define ETH_RX_BD_MISS_OFFSET	       7
#define ETH_RX_BD_UVERRUN_OFFSET       6
#define ETH_RX_BD_INVALID_OFFSET       5
#define ETH_RX_BD_DRIBBLE_OFFSET       4
#define ETH_RX_BD_TOOBIG_OFFSET	       3
#define ETH_RX_BD_TOOSHORT_OFFSET      2
#define ETH_RX_BD_CRC_OFFSET           1
#define ETH_RX_BD_COLLISION_OFFSET     0
 
/*
 * Ethernet protocol definitions
 */
#ifdef HAVE_NET_ETHERNET_H
#elif defined(HAVE_SYS_ETHERNET_H)
#ifndef ETHER_ADDR_LEN
#define ETHER_ADDR_LEN ETHERADDRL
#endif
#ifndef ETHER_HDR_LEN
#define ETHER_HDR_LEN sizeof(struct ether_header)
#endif
#else /* !HAVE_NET_ETHERNET_H && !HAVE_SYS_ETHERNET_H - */
#ifdef __CYGWIN__
/* define some missing cygwin defines.
 *
 * NOTE! there is no nonblocking socket option implemented in cygwin.dll
 *       so defining MSG_DONTWAIT is just (temporary) workaround !!!
 */
#define MSG_DONTWAIT  0x40
#define ETH_HLEN      14
#endif /* __CYGWIN__ */
 
#define ETH_ALEN    6
 
struct ether_addr
{
  u_int8_t ether_addr_octet[ETH_ALEN];
};
 
struct ether_header
{
  u_int8_t ether_dhost[ETH_ALEN];	/* destination eth addr */
  u_int8_t ether_shost[ETH_ALEN];	/* source ether addr    */
  u_int16_t ether_type;		/* packet type ID field */
};
 
/* Ethernet protocol ID's */
#define	ETHERTYPE_PUP		0x0200	/* Xerox PUP */
#define	ETHERTYPE_IP		0x0800	/* IP */
#define	ETHERTYPE_ARP		0x0806	/* Address resolution */
#define	ETHERTYPE_REVARP	0x8035	/* Reverse ARP */
 
#define	ETHER_ADDR_LEN	ETH_ALEN	/* size of ethernet addr */
#define	ETHER_TYPE_LEN	2	/* bytes in type field */
#define	ETHER_CRC_LEN	4	/* bytes in CRC field */
#define	ETHER_HDR_LEN	ETH_HLEN	/* total octets in header */
#define	ETHER_MIN_LEN	(ETH_ZLEN + ETHER_CRC_LEN)	/* min packet length */
#define	ETHER_MAX_LEN	(ETH_FRAME_LEN + ETHER_CRC_LEN)	/* max packet length */
 
/* make sure ethenet length is valid */
#define	ETHER_IS_VALID_LEN(foo)	\
	((foo) >= ETHER_MIN_LEN && (foo) <= ETHER_MAX_LEN)
 
/*
 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
 * by an ETHER type (as given above) and then the (variable-length) header.
 */
#define	ETHERTYPE_TRAIL		0x1000	/* Trailer packet */
#define	ETHERTYPE_NTRAILER	16
 
#define	ETHERMTU	ETH_DATA_LEN
#define	ETHERMIN	(ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
 
#endif /* HAVE_NET_ETHERNET_H */
 
/*
 * Implementatino of Ethernet MAC Registers and State
 */
#define ETH_TXSTATE_IDLE	0
#define ETH_TXSTATE_WAIT4BD	10
#define ETH_TXSTATE_READFIFO	20
#define ETH_TXSTATE_TRANSMIT	30
 
#define ETH_RXSTATE_IDLE	0
#define ETH_RXSTATE_WAIT4BD	10
#define ETH_RXSTATE_RECV	20
#define ETH_RXSTATE_WRITEFIFO	30
 
#define ETH_RTX_FILE    0
#define ETH_RTX_SOCK    1
#define ETH_RTX_VAPI	2
 
#define ETH_MAXPL   0x10000
 
enum
{ ETH_VAPI_DATA = 0,
  ETH_VAPI_CTRL,
  ETH_NUM_VAPI_IDS
};
 
 
/* Prototypes for external use */
extern void  reg_ethernet_sec ();
 
#endif /* ETH__H */