drivers/net/ethernet/apple/mace.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * mace.h - definitions for the registers in the Am79C940 MACE
   4  * (Medium Access Control for Ethernet) controller.
   5  *
   6  * Copyright (C) 1996 Paul Mackerras.
   7  */
   8
   9 #define REG(x)  volatile unsigned char x; char x ## _pad[15]
  10
  11 struct mace {
  12         REG(rcvfifo);           /* receive FIFO */
  13         REG(xmtfifo);           /* transmit FIFO */
  14         REG(xmtfc);             /* transmit frame control */
  15         REG(xmtfs);             /* transmit frame status */
  16         REG(xmtrc);             /* transmit retry count */
  17         REG(rcvfc);             /* receive frame control */
  18         REG(rcvfs);             /* receive frame status (4 bytes) */
  19         REG(fifofc);            /* FIFO frame count */
  20         REG(ir);                /* interrupt register */
  21         REG(imr);               /* interrupt mask register */
  22         REG(pr);                /* poll register */
  23         REG(biucc);             /* bus interface unit config control */
  24         REG(fifocc);            /* FIFO configuration control */
  25         REG(maccc);             /* medium access control config control */
  26         REG(plscc);             /* phys layer signalling config control */
  27         REG(phycc);             /* physical configuration control */
  28         REG(chipid_lo);         /* chip ID, lsb */
  29         REG(chipid_hi);         /* chip ID, msb */
  30         REG(iac);               /* internal address config */
  31         REG(reg19);
  32         REG(ladrf);             /* logical address filter (8 bytes) */
  33         REG(padr);              /* physical address (6 bytes) */
  34         REG(reg22);
  35         REG(reg23);
  36         REG(mpc);               /* missed packet count (clears when read) */
  37         REG(reg25);
  38         REG(rntpc);             /* runt packet count (clears when read) */
  39         REG(rcvcc);             /* recv collision count (clears when read) */
  40         REG(reg28);
  41         REG(utr);               /* user test reg */
  42         REG(reg30);
  43         REG(reg31);
  44 };
  45
  46 /* Bits in XMTFC */
  47 #define DRTRY           0x80    /* don't retry transmission after collision */
  48 #define DXMTFCS         0x08    /* don't append FCS to transmitted frame */
  49 #define AUTO_PAD_XMIT   0x01    /* auto-pad short packets on transmission */
  50
  51 /* Bits in XMTFS: only valid when XMTSV is set in PR and XMTFS */
  52 #define XMTSV           0x80    /* transmit status (i.e. XMTFS) valid */
  53 #define UFLO            0x40    /* underflow - xmit fifo ran dry */
  54 #define LCOL            0x20    /* late collision (transmission aborted) */
  55 #define MORE            0x10    /* 2 or more retries needed to xmit frame */
  56 #define ONE             0x08    /* 1 retry needed to xmit frame */
  57 #define DEFER           0x04    /* MACE had to defer xmission (enet busy) */
  58 #define LCAR            0x02    /* loss of carrier (transmission aborted) */
  59 #define RTRY            0x01    /* too many retries (transmission aborted) */
  60
  61 /* Bits in XMTRC: only valid when XMTSV is set in PR (and XMTFS) */
  62 #define EXDEF           0x80    /* had to defer for excessive time */
  63 #define RETRY_MASK      0x0f    /* number of retries (0 - 15) */
  64
  65 /* Bits in RCVFC */
  66 #define LLRCV           0x08    /* low latency receive: early DMA request */
  67 #define M_RBAR          0x04    /* sets function of EAM/R pin */
  68 #define AUTO_STRIP_RCV  0x01    /* auto-strip short LLC frames on recv */
  69
  70 /*
  71  * Bits in RCVFS.  After a frame is received, four bytes of status
  72  * are automatically read from this register and appended to the frame
  73  * data in memory.  These are:
  74  * Byte 0 and 1: message byte count and frame status
  75  * Byte 2: runt packet count
  76  * Byte 3: receive collision count
  77  */
  78 #define RS_OFLO         0x8000  /* receive FIFO overflowed */
  79 #define RS_CLSN         0x4000  /* received frame suffered (late) collision */
  80 #define RS_FRAMERR      0x2000  /* framing error flag */
  81 #define RS_FCSERR       0x1000  /* frame had FCS error */
  82 #define RS_COUNT        0x0fff  /* mask for byte count field */
  83
  84 /* Bits (fields) in FIFOFC */
  85 #define RCVFC_SH        4       /* receive frame count in FIFO */
  86 #define RCVFC_MASK      0x0f
  87 #define XMTFC_SH        0       /* transmit frame count in FIFO */
  88 #define XMTFC_MASK      0x0f
  89
  90 /*
  91  * Bits in IR and IMR.  The IR clears itself when read.
  92  * Setting a bit in the IMR will disable the corresponding interrupt.
  93  */
  94 #define JABBER          0x80    /* jabber error - 10baseT xmission too long */
  95 #define BABBLE          0x40    /* babble - xmitter xmitting for too long */
  96 #define CERR            0x20    /* collision err - no SQE test (heartbeat) */
  97 #define RCVCCO          0x10    /* RCVCC overflow */
  98 #define RNTPCO          0x08    /* RNTPC overflow */
  99 #define MPCO            0x04    /* MPC overflow */
 100 #define RCVINT          0x02    /* receive interrupt */
 101 #define XMTINT          0x01    /* transmitter interrupt */
 102
 103 /* Bits in PR */
 104 #define XMTSV           0x80    /* XMTFS valid (same as in XMTFS) */
 105 #define TDTREQ          0x40    /* set when xmit fifo is requesting data */
 106 #define RDTREQ          0x20    /* set when recv fifo requests data xfer */
 107
 108 /* Bits in BIUCC */
 109 #define BSWP            0x40    /* byte swap, i.e. big-endian bus */
 110 #define XMTSP_4         0x00    /* start xmitting when 4 bytes in FIFO */
 111 #define XMTSP_16        0x10    /* start xmitting when 16 bytes in FIFO */
 112 #define XMTSP_64        0x20    /* start xmitting when 64 bytes in FIFO */
 113 #define XMTSP_112       0x30    /* start xmitting when 112 bytes in FIFO */
 114 #define SWRST           0x01    /* software reset */
 115
 116 /* Bits in FIFOCC */
 117 #define XMTFW_8         0x00    /* xmit fifo watermark = 8 words free */
 118 #define XMTFW_16        0x40    /*  16 words free */
 119 #define XMTFW_32        0x80    /*  32 words free */
 120 #define RCVFW_16        0x00    /* recv fifo watermark = 16 bytes avail */
 121 #define RCVFW_32        0x10    /*  32 bytes avail */
 122 #define RCVFW_64        0x20    /*  64 bytes avail */
 123 #define XMTFWU          0x08    /* xmit fifo watermark update enable */
 124 #define RCVFWU          0x04    /* recv fifo watermark update enable */
 125 #define XMTBRST         0x02    /* enable transmit burst mode */
 126 #define RCVBRST         0x01    /* enable receive burst mode */
 127
 128 /* Bits in MACCC */
 129 #define PROM            0x80    /* promiscuous mode */
 130 #define DXMT2PD         0x40    /* disable xmit two-part deferral algorithm */
 131 #define EMBA            0x20    /* enable modified backoff algorithm */
 132 #define DRCVPA          0x08    /* disable receiving physical address */
 133 #define DRCVBC          0x04    /* disable receiving broadcasts */
 134 #define ENXMT           0x02    /* enable transmitter */
 135 #define ENRCV           0x01    /* enable receiver */
 136
 137 /* Bits in PLSCC */
 138 #define XMTSEL          0x08    /* select DO+/DO- state when idle */
 139 #define PORTSEL_AUI     0x00    /* select AUI port */
 140 #define PORTSEL_10T     0x02    /* select 10Base-T port */
 141 #define PORTSEL_DAI     0x04    /* select DAI port */
 142 #define PORTSEL_GPSI    0x06    /* select GPSI port */
 143 #define ENPLSIO         0x01    /* enable optional PLS I/O pins */
 144
 145 /* Bits in PHYCC */
 146 #define LNKFL           0x80    /* reports 10Base-T link failure */
 147 #define DLNKTST         0x40    /* disable 10Base-T link test */
 148 #define REVPOL          0x20    /* 10Base-T receiver polarity reversed */
 149 #define DAPC            0x10    /* disable auto receiver polarity correction */
 150 #define LRT             0x08    /* low receive threshold for long links */
 151 #define ASEL            0x04    /* auto-select AUI or 10Base-T port */
 152 #define RWAKE           0x02    /* remote wake function */
 153 #define AWAKE           0x01    /* auto wake function */
 154
 155 /* Bits in IAC */
 156 #define ADDRCHG         0x80    /* request address change */
 157 #define PHYADDR         0x04    /* access physical address */
 158 #define LOGADDR         0x02    /* access multicast filter */
 159
 160 /* Bits in UTR */
 161 #define RTRE            0x80    /* reserved test register enable. DON'T SET. */
 162 #define RTRD            0x40    /* reserved test register disable.  Sticky */
 163 #define RPAC            0x20    /* accept runt packets */
 164 #define FCOLL           0x10    /* force collision */
 165 #define RCVFCSE         0x08    /* receive FCS enable */
 166 #define LOOP_NONE       0x00    /* no loopback */
 167 #define LOOP_EXT        0x02    /* external loopback */
 168 #define LOOP_INT        0x04    /* internal loopback, excludes MENDEC */
 169 #define LOOP_MENDEC     0x06    /* internal loopback, includes MENDEC */