FreeBSD/Linux Kernel Cross Reference
sys/dev/sn/if_snreg.h

     /*-
      * Copyright (c) 1996 Gardner Buchanan <gbuchanan@shl.com>
      * 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 Gardner Buchanan.
     * 4. The name of Gardner Buchanan may not be used to endorse or promote
     *    products derived from this software without specific prior written
     *    permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
     *
     *   $FreeBSD: src/sys/dev/sn/if_snreg.h,v 1.4.4.1 2005/01/30 01:00:02 imp Exp $
     */
    
    /*
     * This file contains register information and access macros for
     * the SMC91xxx chipset.
     *
     * Information contained in this file was obtained from the SMC91C92
     * and SMC91C94 manuals from SMC.  You will need one of these in order
     * to make any meaningful changes to this driver.  Information about
     * obtaining one can be found at http://www.smc.com in the components
     * division.
     *
     * This FreeBSD driver is derived in part from the smc9194 Linux driver
     * by Erik Stahlman and is Copyright (C) 1996 by Erik Stahlman.
     * It is also derived in part from the FreeBSD ep (3C509) driver which
     * is Copyright (c) 1993 Herb Peyerl (hpeyerl@novatel.ca) All rights
     * reserved.
     *
     */
    #ifndef _IF_SNREG_H_
    #define _IF_SNREG_H_
    
    /*
     * Wait time for memory to be free.  This probably shouldn't be
     * tuned that much, as waiting for this means nothing else happens
     * in the system
     */
    #define MEMORY_WAIT_TIME        1000
    
    
    /* The SMC91xxx uses 16 I/O ports
     */
    #define SMC_IO_EXTENT   16
    
    
    /*
     * A description of the SMC registers is probably in order here,
     * although for details, the SMC datasheet is invaluable.
     * The data sheet I (GB) am using is "SMC91C92 Single Chip Ethernet
     * Controller With RAM", Rev. 12/0/94.  Constant definitions I give
     * here are loosely based on the mnemonic names given to them in the
     * data sheet, but there are many exceptions.
     *
     * Basically, the chip has 4 banks of registers (0 to 3), which
     * are accessed by writing a number into the BANK_SELECT register
     * (I also use a SMC_SELECT_BANK macro for this).  Registers are
     * either Byte or Word sized.  My constant definitions end in _B
     * or _W as appropriate.
     *
     * The banks are arranged so that for most purposes, bank 2 is all
     * that is needed for normal run time tasks.
     */
    
    /*
     * Bank Select Register.  This also doubles as
     * a chip identification register.  This register
     * is mapped at the same position in all banks.
     */
    #define BANK_SELECT_REG_W       0x0e
    #define BSR_DETECT_MASK         0xff00
    #define BSR_DETECT_VALUE        0x3300
    
    
    /* BANK 0
     */
    
    /* Transmit Control Register controls some aspects of the transmit
     * behavior of the Ethernet Protocol Handler.
    */
   #define TXMIT_CONTROL_REG_W  0x00
   
   #define TCR_ENABLE      0x0001  /* if this is 1, we can transmit */
   #define TCR_LOOP        0x0002  /* Enable internal analogue loopback */
   #define TCR_FORCOL      0x0004  /* Force Collision on next TX */
   #define TCR_PAD_ENABLE  0x0080  /* Pad short packets to 64 bytes */
   #define TCR_NOCRC       0x0100  /* Do not append CRC */
   #define TCR_MON_CSN     0x0400  /* monitors the carrier status */
   #define TCR_FDUPLX      0x0800  /* receive packets sent out */
   #define TCR_STP_SQET    0x1000  /* stop transmitting if Signal quality error */
   #define TCR_EPH_LOOP    0x2000  /* Enable internal digital loopback */
   
   
   /* Status of the last transmitted frame and instantaneous status of
    * the Ethernet Protocol Handler jumbled together.  In auto-release
    * mode this information is simply discarded after each TX.  This info
    * is copied to the status word of in-memory packets after transmit
    * where relevent statuses can be checked.
    */
   #define EPH_STATUS_REG_W 0x02
   
   #define EPHSR_TX_SUC    0x0001  /* Transmit was successful */
   #define EPHSR_SNGLCOL   0x0002  /* Single collision occurred */
   #define EPHSR_MULCOL    0x0004  /* Multiple Collisions occurred */
   #define EPHSR_LTX_MULT  0x0008  /* Transmit was a multicast */
   #define EPHSR_16COL     0x0010  /* 16 Collisions occurred, TX disabled */
   #define EPHSR_SQET      0x0020  /* SQE Test failed, TX disabled */
   #define EPHSR_LTX_BRD   0x0040  /* Transmit was a broadcast */
   #define EPHSR_DEFR      0x0080  /* TX deferred due to carrier det. */
   #define EPHSR_LATCOL    0x0200  /* Late collision detected, TX disabled */
   #define EPHSR_LOST_CAR  0x0400  /* Lost carrier sense, TX disabled */
   #define EPHSR_EXC_DEF   0x0800  /* Excessive deferrals in TX >2 MAXETHER
                                    * times */
   #define EPHSR_CTR_ROL   0x1000  /* Some ECR Counter(s) rolled over */
   #define EPHSR_RX_OVRN   0x2000  /* Receiver overrun, packets dropped */
   #define EPHSR_LINK_OK   0x4000  /* Link integrity is OK */
   #define EPHSR_TXUNRN    0x8000  /* Transmit underrun */
   
   
   /* Receiver Control Register controls some aspects of the receive
    * behavior of the Ethernet Protocol Handler.
    */
   #define RECV_CONTROL_REG_W 0x04
   
   #define RCR_RX_ABORT    0x0001  /* Received huge packet */
   #define RCR_PROMISC     0x0002  /* enable promiscuous mode */
   #define RCR_ALMUL       0x0004  /* receive all multicast packets */
   #define RCR_ENABLE      0x0100  /* IFF this is set, we can recieve packets */
   #define RCR_STRIP_CRC   0x0200  /* strips CRC */
   #define RCR_GAIN_BITS   0x0c00  /* PLL Gain control (for testing) */
   #define RCR_FILT_CAR    0x4000  /* Enable 12 bit carrier filter */
   #define RCR_SOFTRESET   0x8000  /* Resets the EPH logic */
   
   
   /* TX Statistics counters
    */
   #define COUNTER_REG_W   0x06
   
   #define ECR_COLN_MASK   0x000f  /* Vanilla collisions */
   #define ECR_MCOLN_MASK  0x00f0  /* Multiple collisions */
   #define ECR_DTX_MASK    0x0f00  /* Deferred transmits */
   #define ECR_EXDTX_MASK  0xf000  /* Excessively deferred transmits */
   
   /* Memory Information
    */
   #define MEM_INFO_REG_W  0x08
   
   #define MIR_FREE_MASK   0xff00  /* Free memory pages available */
   #define MIR_TOTAL_MASK  0x00ff  /* Total memory pages available */
   
   /* Memory Configuration
    */
   #define MEM_CFG_REG_W   0x0a
   
   #define MCR_TXRSV_MASK  0x001f  /* Count of pages reserved for transmit */
   
   
   /* Bank 0, Register 0x0c is unised in the SMC91C92
    */
   
   
   /* BANK 1
    */
   
   /* Adapter configuration
    */
   #define CONFIG_REG_W    0x00
   
   #define CR_INT_SEL0     0x0002  /* Interrupt selector */
   #define CR_INT_SEL1     0x0004  /* Interrupt selector */
   #define CR_DIS_LINK     0x0040  /* Disable 10BaseT Link Test */
   #define CR_16BIT        0x0080  /* Bus width */
   #define CR_AUI_SELECT   0x0100  /* Use external (AUI) Transceiver */
   #define CR_SET_SQLCH    0x0200  /* Squelch level */
   #define CR_FULL_STEP    0x0400  /* AUI signalling mode */
   #define CR_NOW_WAIT_ST  0x1000  /* Disable bus wait states */
   
   /* The contents of this port are used by the adapter
    * to decode its I/O address.  We use it as a varification
    * that the adapter is detected properly when probing.
    */
   #define BASE_ADDR_REG_W 0x02    /* The select IO Base addr. */
   
   /* These registers hold the Ethernet MAC address.
    */
   #define IAR_ADDR0_REG_W 0x04    /* My Ethernet address */
   #define IAR_ADDR1_REG_W 0x06    /* My Ethernet address */
   #define IAR_ADDR2_REG_W 0x08    /* My Ethernet address */
   
   /* General purpose register used for talking to the EEPROM.
    */
   #define GENERAL_REG_W   0x0a
   
   /* Control register used for talking to the EEPROM and
    * setting some EPH functions.
    */
   #define CONTROL_REG_W    0x0c
   #define CTR_STORE        0x0001 /* Store something to EEPROM */
   #define CTR_RELOAD       0x0002 /* Read EEPROM into registers */
   #define CTR_EEPROM_SEL   0x0004 /* Select registers for Reload/Store */
   #define CTR_TE_ENABLE    0x0020 /* Enable TX Error detection via EPH_INT */
   #define CTR_CR_ENABLE    0x0040 /* Enable Counter Rollover via EPH_INT */
   #define CTR_LE_ENABLE    0x0080 /* Enable Link Error detection via EPH_INT */
   #define CTR_AUTO_RELEASE 0x0800 /* Enable auto release mode for TX */
   #define CTR_POWERDOWN    0x2000 /* Enter powerdown mode */
   #define CTR_RCV_BAD      0x4000 /* Enable receipt of frames with bad CRC */
   
   
   /* BANK 2
    */
   
   /* Memory Management Unit Control Register
    * Controls allocation of memory to receive and
    * transmit functions.
    */
   #define MMU_CMD_REG_W   0x00
   #define MMUCR_BUSY      0x0001  /* MMU busy performing a release */
   
   /* MMU Commands:
    */
   #define MMUCR_NOP       0x0000  /* Do nothing */
   #define MMUCR_ALLOC     0x0020  /* Or with number of 256 byte packets - 1 */
   #define MMUCR_RESET     0x0040  /* Reset MMU State */
   #define MMUCR_REMOVE    0x0060  /* Dequeue (but not free) current RX packet */
   #define MMUCR_RELEASE   0x0080  /* Dequeue and free the current RX packet */
   #define MMUCR_FREEPKT   0x00a0  /* Release packet in PNR register */
   #define MMUCR_ENQUEUE   0x00c0  /* Enqueue the packet for transmit */
   #define MMUCR_RESETTX   0x00e0  /* Reset transmit queues */
   
   /* Packet Number at TX Area
    */
   #define PACKET_NUM_REG_B   0x02
   
   /* Packet number resulting from MMUCR_ALLOC
    */
   #define ALLOC_RESULT_REG_B 0x03
   #define ARR_FAILED      0x80
   
   /* Transmit and receive queue heads
    */
   #define FIFO_PORTS_REG_W 0x04
   #define FIFO_REMPTY     0x8000
   #define FIFO_TEMPTY     0x0080
   #define FIFO_RX_MASK    0x7f00
   #define FIFO_TX_MASK    0x007f
   
   /* The address within the packet for reading/writing.  The
    * PTR_RCV bit is tricky.  When PTR_RCV==1, the packet number
    * to be read is found in the FIFO_PORTS_REG_W, FIFO_RX_MASK.
    * When PTR_RCV==0, the packet number to be written is found
    * in the PACKET_NUM_REG_B.
    */
   #define POINTER_REG_W   0x06
   #define PTR_READ        0x2000  /* Intended access mode */
   #define PTR_AUTOINC     0x4000  /* Do auto inc after read/write */
   #define PTR_RCV         0x8000  /* FIFO_RX is packet, otherwise PNR is packet */
   
   /* Data I/O register to be used in conjunction with
    * The pointer register to read and write data from the
    * card.  The same register can be used for byte and word
    * ops.
    */
   #define DATA_REG_W      0x08
   #define DATA_REG_B      0x08
   #define DATA_1_REG_B    0x08
   #define DATA_2_REG_B    0x0a
   
   /* Sense interrupt status (READ)
    */
   #define INTR_STAT_REG_B 0x0c
   
   /* Acknowledge interrupt sources (WRITE)
    */
   #define INTR_ACK_REG_B  0x0c
   
   /* Interrupt mask.  Bit set indicates interrupt allowed.
    */
   #define INTR_MASK_REG_B 0x0d
   
   /* Interrupts
    */
   #define IM_RCV_INT      0x01    /* A packet has been received */
   #define IM_TX_INT       0x02    /* Packet TX complete */
   #define IM_TX_EMPTY_INT 0x04    /* No packets left to TX  */
   #define IM_ALLOC_INT    0x08    /* Memory allocation completed */
   #define IM_RX_OVRN_INT  0x10    /* Receiver was overrun */
   #define IM_EPH_INT      0x20    /* Misc. EPH conditions (see CONTROL_REG_W) */
   #define IM_ERCV_INT     0x40    /* not on SMC9192 */
   
   /* BANK 3
    */
   
   /* Multicast subscriptions.
    * The multicast handling in the SMC90Cxx is quite complicated.  A table
    * of multicast address subscriptions is provided and a clever way of
    * speeding the search of that table by hashing is implemented in the
    * hardware.  I have ignored this and simply subscribed to all multicasts
    * and let the kernel deal with the results.
    */
   #define MULTICAST1_REG_W 0x00
   #define MULTICAST2_REG_W 0x02
   #define MULTICAST3_REG_W 0x04
   #define MULTICAST4_REG_W 0x06
   
   /* These registers do not exist on SMC9192, or at least
    * are not documented in the SMC91C92 data sheet.
    * The REVISION_REG_W register does however seem to work.
    */
   #define MGMT_REG_W      0x08
   #define REVISION_REG_W  0x0a    /* (hi: chip id low: rev #) */
   #define ERCV_REG_W      0x0c
   
   /* These are constants expected to be found in the
    * chip id register.
    */
   #define CHIP_9190       3
   #define CHIP_9194       4
   #define CHIP_9195       5
   #define CHIP_91100      7
   #define CHIP_91100FD    8
   
   /* When packets are stuffed into the card or sucked out of the card
    * they are set up more or less as follows:
    *
    * Addr msbyte   lsbyte
    * 00   SSSSSSSS SSSSSSSS - STATUS-WORD 16 bit TX or RX status
    * 02   RRRRR             - RESERVED (unused)
    * 02        CCC CCCCCCCC - BYTE COUNT (RX: always even, TX: bit 0 ignored)
    * 04   DDDDDDDD DDDDDDDD - DESTINATION ADDRESS
    * 06   DDDDDDDD DDDDDDDD        (48 bit Ethernet MAC Address)
    * 08   DDDDDDDD DDDDDDDD
    * 0A   SSSSSSSS SSSSSSSS - SOURCE ADDRESS
    * 0C   SSSSSSSS SSSSSSSS        (48 bit Ethernet MAC Address)
    * 0E   SSSSSSSS SSSSSSSS
    * 10   PPPPPPPP PPPPPPPP
    * ..   PPPPPPPP PPPPPPPP
    * C-2  CCCCCCCC          - CONTROL BYTE
    * C-2           PPPPPPPP - Last data byte (If odd length)
    *
    * The STATUS_WORD is derived from the EPH_STATUS_REG_W register
    * during transmit and is composed of another set of bits described
    * below during receive.
    */
   
   
   /* Receive status bits.  These values are found in the status word
    * field of a received packet.  For receive packets I use the RS_ODDFRAME
    * to detect whether a frame has an extra byte on it.  The CTLB_ODD
    * bit of the control byte tells the same thing.
    */
   #define RS_MULTICAST    0x0001  /* Packet is multicast */
   #define RS_HASH_MASK    0x007e  /* Mask of multicast hash value */
   #define RS_TOOSHORT     0x0400  /* Frame was a runt, <64 bytes */
   #define RS_TOOLONG      0x0800  /* Frame was giant, >1518 */
   #define RS_ODDFRAME     0x1000  /* Frame is odd lengthed */
   #define RS_BADCRC       0x2000  /* Frame had CRC error */
   #define RS_ALGNERR      0x8000  /* Frame had alignment error */
   #define RS_ERRORS       (RS_ALGNERR | RS_BADCRC | RS_TOOLONG | RS_TOOSHORT)
   
   #define RLEN_MASK       0x07ff  /* Significant length bits in RX length */
   
   /* The control byte has the following significant bits.
    * For transmit, the CTLB_ODD bit specifies whether an extra byte
    * is present in the frame.  Bit 0 of the byte count field is
    * ignored.  I just pad every frame to even length and forget about
    * it.
    */
   #define CTLB_CRC        0x10    /* Add CRC for this packet (TX only) */
   #define CTLB_ODD        0x20    /* The packet length is ODD */
   
   
   /*
    * I define some macros to make it easier to do somewhat common
    * or slightly complicated, repeated tasks.
    */
   
   /* Select a register bank, 0 to 3
    */
   #define SMC_SELECT_BANK(sc, x)  { CSR_WRITE_2(sc, BANK_SELECT_REG_W, (x)); }
   
   /* Define a small delay for the reset
    */
   #define SMC_DELAY(sc) { CSR_READ_2(sc, RECV_CONTROL_REG_W); \
                           CSR_READ_2(sc, RECV_CONTROL_REG_W); \
                           CSR_READ_2(sc, RECV_CONTROL_REG_W); }
   
   /* Define flags
    */
   
   #define SN_FLAGS_PCCARD         0x0001  /* PCMCIA (PC-card) */
   #define SN_FLAGS_XJBT10         0x0002  /* Megahertz XJ-BT10 (PCMCIA) */
   
   #endif  /* _IF_SNREG_H_ */

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