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/*
* Am7990, Local Area Network Controller for Ethernet (LANCE)
*
* Copyright (c) 1994, Paul Richards. This software may be used,
* modified, copied, distributed, and sold, in both source and binary
* form provided that the above copyright and these terms are retained.
* Under no circumstances is the author responsible for the proper
* functioning of this software, nor does the author assume any
* responsibility for damages incurred with its use.
*
*/
/*
* The LANCE has four Control and Status Registers(CSRs) which are accessed
* through two bus addressable ports, the address port (RAP) and the data
* port (RDP).
*
*/
#define CSR0 0
#define CSR1 1
#define CSR2 2
#define CSR3 3
#define CSR88 88
#define CSR89 89
/* Control and Status Register Masks */
/* CSR0 */
#define ERR 0x8000
#define BABL 0x4000
#define CERR 0x2000
#define MISS 0x1000
#define MERR 0x0800
#define RINT 0x0400
#define TINT 0x0200
#define IDON 0x0100
#define INTR 0x0080
#define INEA 0x0040
#define RXON 0x0020
#define TXON 0x0010
#define TDMD 0x0008
#define STOP 0x0004
#define STRT 0x0002
#define INIT 0x0001
/*
* CSR3
*
* Bits 3-15 are reserved.
*
*/
#define BSWP 0x0004
#define ACON 0x0002
#define BCON 0x0001
/* Initialisation block */
struct init_block {
u_short mode; /* Mode register */
u_char padr[6]; /* Ethernet address */
u_char ladrf[8]; /* Logical address filter (multicast) */
u_short rdra; /* Low order pointer to receive ring */
u_short rlen; /* High order pointer and no. rings */
u_short tdra; /* Low order pointer to transmit ring */
u_short tlen; /* High order pointer and no rings */
};
/* Initialisation Block Mode Register Masks */
#define PROM 0x8000 /* Promiscuous Mode */
#define DRCVBC 0x4000 /* Disable Receive Broadcast */
#define DRCVPA 0x2000 /* Disable Receive Physical Address */
#define DLNKTST 0x1000 /* Disable Link Status */
#define DAPC 0x0800 /* Disable Automatic Polarity Correction */
#define MENDECL 0x0400 /* MENDEC Loopback Mode */
#define LRT 0x0200 /* Low Receive Threshold (T-MAU mode only) */
#define TSEL 0x0200 /* Transmit Mode Select (AUI mode only) */
#define PORTSEL 0x0180 /* Port Select bits */
#define INTL 0x0040 /* Internal Loopback */
#define DRTY 0x0020 /* Disable Retry */
#define FCOLL 0x0010 /* Force Collision */
#define DXMTFCS 0x0008 /* Disable transmit CRC (FCS) */
#define LOOP 0x0004 /* Loopback Enabl */
#define DTX 0x0002 /* Disable the transmitter */
#define DRX 0x0001 /* Disable the receiver */
/*
* Message Descriptor Structure
*
* Each transmit or receive descriptor ring entry (RDRE's and TDRE's)
* is composed of 4, 16-bit, message descriptors. They contain the following
* information.
*
* 1. The address of the actual message data buffer in user (host) memory.
* 2. The length of that message buffer.
* 3. The status information for that particular buffer. The eight most
* significant bits of md1 are collectively termed the STATUS of the
* descriptor.
*
* Descriptor md0 contains LADR 0-15, the low order 16 bits of the 24-bit
* address of the actual data buffer. Bits 0-7 of descriptor md1 contain
* HADR, the high order 8-bits of the 24-bit data buffer address. Bits 8-15
* of md1 contain the status flags of the buffer. Descriptor md2 contains the
* buffer byte count in bits 0-11 as a two's complement number and must have
* 1's written to bits 12-15. For the receive entry md3 has the Message Byte
* Count in bits 0-11, this is the length of the received message and is valid
* only when ERR is cleared and ENP is set. For the transmit entry it contains
* more status information.
*
*/
struct mds {
u_short md0;
u_short md1;
short md2;
u_short md3;
};
/* Receive STATUS flags for md1 */
#define OWN 0x8000 /* Owner bit, 0=host, 1=Lance */
#define MDERR 0x4000 /* Error */
#define FRAM 0x2000 /* Framing error error */
#define OFLO 0x1000 /* Silo overflow */
#define CRC 0x0800 /* CRC error */
#define RBUFF 0x0400 /* Buffer error */
#define STP 0x0200 /* Start of packet */
#define ENP 0x0100 /* End of packet */
#define HADR 0x00FF /* High order address bits */
/* Receive STATUS flags for md2 */
#define BCNT 0x0FFF /* Size of data buffer as 2's comp. no. */
/* Receive STATUS flags for md3 */
#define MCNT 0x0FFF /* Total size of data for received packet */
/* Transmit STATUS flags for md1 */
#define ADD_FCS 0x2000 /* Controls generation of FCS */
#define MORE 0x1000 /* Indicates more than one retry was needed */
#define ONE 0x0800 /* Exactly one retry was needed */
#define DEF 0x0400 /* Packet transmit deferred -- channel busy */
/*
* Transmit status flags for md2
*
* Same as for receive descriptor.
*
* BCNT 0x0FFF Size of data buffer as 2's complement number.
*
*/
/* Transmit status flags for md3 */
#define TBUFF 0x8000 /* Buffer error */
#define UFLO 0x4000 /* Silo underflow */
#define LCOL 0x1000 /* Late collision */
#define LCAR 0x0800 /* Loss of carrier */
#define RTRY 0x0400 /* Tried 16 times */
#define TDR 0x03FF /* Time domain reflectometry */
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