/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * mace.h - definitions for the registers in the Am79C940 MACE * (Medium Access Control for Ethernet) controller. * * Copyright (C) 1996 Paul Mackerras.
*/
#define REG(x) volatileunsignedchar x; char x ## _pad[15]
struct mace {
REG(rcvfifo); /* receive FIFO */
REG(xmtfifo); /* transmit FIFO */
REG(xmtfc); /* transmit frame control */
REG(xmtfs); /* transmit frame status */
REG(xmtrc); /* transmit retry count */
REG(rcvfc); /* receive frame control */
REG(rcvfs); /* receive frame status (4 bytes) */
REG(fifofc); /* FIFO frame count */
REG(ir); /* interrupt register */
REG(imr); /* interrupt mask register */
REG(pr); /* poll register */
REG(biucc); /* bus interface unit config control */
REG(fifocc); /* FIFO configuration control */
REG(maccc); /* medium access control config control */
REG(plscc); /* phys layer signalling config control */
REG(phycc); /* physical configuration control */
REG(chipid_lo); /* chip ID, lsb */
REG(chipid_hi); /* chip ID, msb */
REG(iac); /* internal address config */
REG(reg19);
REG(ladrf); /* logical address filter (8 bytes) */
REG(padr); /* physical address (6 bytes) */
REG(reg22);
REG(reg23);
REG(mpc); /* missed packet count (clears when read) */
REG(reg25);
REG(rntpc); /* runt packet count (clears when read) */
REG(rcvcc); /* recv collision count (clears when read) */
REG(reg28);
REG(utr); /* user test reg */
REG(reg30);
REG(reg31);
};
/* Bits in XMTFC */ #define DRTRY 0x80 /* don't retry transmission after collision */ #define DXMTFCS 0x08 /* don't append FCS to transmitted frame */ #define AUTO_PAD_XMIT 0x01 /* auto-pad short packets on transmission */
/* Bits in XMTFS: only valid when XMTSV is set in PR and XMTFS */ #define XMTSV 0x80 /* transmit status (i.e. XMTFS) valid */ #define UFLO 0x40 /* underflow - xmit fifo ran dry */ #define LCOL 0x20 /* late collision (transmission aborted) */ #define MORE 0x10 /* 2 or more retries needed to xmit frame */ #define ONE 0x08 /* 1 retry needed to xmit frame */ #define DEFER 0x04 /* MACE had to defer xmission (enet busy) */ #define LCAR 0x02 /* loss of carrier (transmission aborted) */ #define RTRY 0x01 /* too many retries (transmission aborted) */
/* Bits in XMTRC: only valid when XMTSV is set in PR (and XMTFS) */ #define EXDEF 0x80 /* had to defer for excessive time */ #define RETRY_MASK 0x0f /* number of retries (0 - 15) */
/* Bits in RCVFC */ #define LLRCV 0x08 /* low latency receive: early DMA request */ #define M_RBAR 0x04 /* sets function of EAM/R pin */ #define AUTO_STRIP_RCV 0x01 /* auto-strip short LLC frames on recv */
/* * Bits in RCVFS. After a frame is received, four bytes of status * are automatically read from this register and appended to the frame * data in memory. These are: * Byte 0 and 1: message byte count and frame status * Byte 2: runt packet count * Byte 3: receive collision count
*/ #define RS_OFLO 0x8000 /* receive FIFO overflowed */ #define RS_CLSN 0x4000 /* received frame suffered (late) collision */ #define RS_FRAMERR 0x2000 /* framing error flag */ #define RS_FCSERR 0x1000 /* frame had FCS error */ #define RS_COUNT 0x0fff /* mask for byte count field */
/* * Bits in IR and IMR. The IR clears itself when read. * Setting a bit in the IMR will disable the corresponding interrupt.
*/ #define JABBER 0x80 /* jabber error - 10baseT xmission too long */ #define BABBLE 0x40 /* babble - xmitter xmitting for too long */ #define CERR 0x20 /* collision err - no SQE test (heartbeat) */ #define RCVCCO 0x10 /* RCVCC overflow */ #define RNTPCO 0x08 /* RNTPC overflow */ #define MPCO 0x04 /* MPC overflow */ #define RCVINT 0x02 /* receive interrupt */ #define XMTINT 0x01 /* transmitter interrupt */
/* Bits in PR */ #define XMTSV 0x80 /* XMTFS valid (same as in XMTFS) */ #define TDTREQ 0x40 /* set when xmit fifo is requesting data */ #define RDTREQ 0x20 /* set when recv fifo requests data xfer */
/* Bits in BIUCC */ #define BSWP 0x40 /* byte swap, i.e. big-endian bus */ #define XMTSP_4 0x00 /* start xmitting when 4 bytes in FIFO */ #define XMTSP_16 0x10 /* start xmitting when 16 bytes in FIFO */ #define XMTSP_64 0x20 /* start xmitting when 64 bytes in FIFO */ #define XMTSP_112 0x30 /* start xmitting when 112 bytes in FIFO */ #define SWRST 0x01 /* software reset */
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