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/*

 * pt.h: Linux device driver for the Gracilis PackeTwin

 * Copyright (C) 1995 Craig Small VK2XLZ (vk2xlz@vk2xlz.ampr.org.)

 *

 * Please read the notice appearing at the top of the file pt.c

 */

#define DMA_BUFF_SIZE 2200

/* Network statistics, with the same names as 'struct enet_statistics'. */

#define netstats enet_statistics

#define ON 1

#define OFF 0

/* Register offset info, specific to the PT

 * E.g., to read the data port on channel A, use

 *  inportb(pichan[dev].base + CHANA + DATA)

 */

#define CHANB   0   /* Base of channel B regs */

#define CHANA   2   /* Base of channel A regs */

/* 8530 ports on each channel */

#define CTL 0

#define DATA    1

#define DMAEN   0x8 /* Offset off DMA Enable register */

/* Timer chip offsets */

#define TMR0    0x4 /* Offset of timer 0 register */

#define TMR1    0x5 /* Offset of timer 1 register */

#define TMR2    0x6 /* Offset of timer 2 register */

#define TMRCMD  0x7 /* Offset of timer command register */

#define INT_REG 0x8

#define TMR1CLR 0x9

#define TMR2CLR 0xa

/* Interrupt register equates */

#define PT_SCC_MSK      0x1

#define PT_TMR1_MSK     0x2

#define PT_TMR2_MSK     0x4

/* Serial/interrupt register equates */

#define PT_DTRA_ON      0x1

#define PT_DTRB_ON      0x2

#define PT_EXTCLKA      0x4

#define PT_EXTCLKB      0x8

#define PT_LOOPA_ON     0x10

#define PT_LOOPB_ON     0x20

#define PT_EI           0x80

/* Timer chip equates */

#define SC0 0x00 /* Select counter 0 */

#define SC1 0x40 /* Select counter 1 */

#define SC2 0x80 /* Select counter 2 */

#define CLATCH  0x00 /* Counter latching operation */

#define MSB 0x20 /* Read/load MSB only */

#define LSB 0x10 /* Read/load LSB only */

#define LSB_MSB 0x30 /* Read/load LSB, then MSB */

#define MODE0   0x00 /* Interrupt on terminal count */

#define MODE1   0x02 /* Programmable one shot */

#define MODE2   0x04 /* Rate generator */

#define MODE3   0x06 /* Square wave rate generator */

#define MODE4   0x08 /* Software triggered strobe */

#define MODE5   0x0a /* Hardware triggered strobe */

#define BCD 0x01 /* BCD counter */

/* DMA controller registers */

#define DMA_STAT    8   /* DMA controller status register */

#define DMA_CMD     8   /* DMA controller command register */

#define DMA_MASK        10  /* DMA controller mask register */

#define DMA_MODE        11  /* DMA controller mode register */

#define DMA_RESETFF 12  /* DMA controller first/last flip flop  */

/* DMA data */

#define DMA_DISABLE (0x04)  /* Disable channel n */

#define DMA_ENABLE  (0x00)  /* Enable channel n */

/* Single transfers, incr. address, auto init, writes, ch. n */

#define DMA_RX_MODE (0x54)

/* Single transfers, incr. address, no auto init, reads, ch. n */

#define DMA_TX_MODE (0x48)

/* Write registers */

#define DMA_CFG         0x08

#define SERIAL_CFG      0x09

#define INT_CFG         0x09    /* shares with serial config */

#define DMA_CLR_FF      0x0a

#define SINGLE 3686400

#define DOUBLE 7372800

#define XTAL   ((long) 6144000L)

#define SIOCGPIPARAM            0x5000  /* get PI parameters */

#define SIOCSPIPARAM            0x5001  /* set */

#define SIOCGPIBAUD             0x5002  /* get only baud rate */

#define SIOCSPIBAUD             0x5003  

#define SIOCGPIDMA              0x5004  /* get only DMA */

#define SIOCSPIDMA              0x5005  

#define SIOCGPIIRQ              0x5006  /* get only IRQ */

#define SIOCSPIIRQ              0x5007  

struct pt_req  {

    int cmd;

    int speed;

    int clockmode;

    int txdelay;

    unsigned char persist;

    int slotime;

    int squeldelay;

    int dmachan;

    int irq;

};

/* SCC Interrupt vectors, if we have set 'status low' */

#define CHBTxIV         0x00

#define CHBEXTIV        0x02

#define CHBRxIV         0x04

#define CHBSRCIV        0x06

#define CHATxIV         0x08

#define CHAEXTIV        0x0a

#define CHARxIV         0x0c

#define CHASRCIV        0x0e

#ifdef __KERNEL__

/* Information that needs to be kept for each channel. */

struct pt_local {

    struct netstats stats; /* %%%dp*/

    long open_time;             /* Useless example local info. */

    unsigned long xtal;

    struct mbuf *rcvbuf;/* Buffer for current rx packet */

    struct mbuf *rxdmabuf1; /* DMA rx buffer */

    struct mbuf *rxdmabuf2; /* DMA rx buffer */

    int bufsiz;         /* Size of rcvbuf */

    char *rcp;          /* Pointer into rcvbuf */

    struct sk_buff_head sndq;  /* Packets awaiting transmission */

    int sndcnt;         /* Number of packets on sndq */

    struct sk_buff *sndbuf;/* Current buffer being transmitted */

    char *txdmabuf;     /* Transmit DMA buffer */

        char *txptr;            /* Used by B port tx */

        int txcnt;

    char tstate;        /* Transmitter state */

#define IDLE    0       /* Transmitter off, no data pending */

#define ACTIVE  1       /* Transmitter on, sending data */

#define UNDERRUN 2      /* Transmitter on, flushing CRC */

#define FLAGOUT 3       /* CRC sent - attempt to start next frame */

#define DEFER 4         /* Receive Active - DEFER Transmit */

#define ST_TXDELAY 5    /* Sending leading flags */

#define CRCOUT 6

    char rstate;        /* Set when !DCD goes to 0 (TRUE) */

/* Normal state is ACTIVE if Receive enabled */

#define RXERROR 2       /* Error -- Aborting current Frame */

#define RXABORT 3       /* ABORT sequence detected */

#define TOOBIG 4        /* too large a frame to store */

    int dev;            /* Device number */

    int base;       /* Base of I/O registers */

    int cardbase;     /* Base address of card */

    int stata;        /* address of Channel A status regs */

    int statb;        /* address of Channel B status regs */

    int speed;        /* Line speed, bps */

    int clockmode;    /* tapr 9600 modem clocking option */

    int txdelay;      /* Transmit Delay 10 ms/cnt */

    unsigned char persist;       /* Persistence (0-255) as a % */

    int slotime;      /* Delay to wait on persistence hit */

    int squeldelay;   /* Delay after XMTR OFF for squelch tail */

    struct iface *iface;    /* Associated interface */

    int dmachan;           /* DMA channel for this port */

    char saved_RR0;     /* The saved version of RR) that we compare with */

    int nrzi;                   /* Do we use NRZI (or NRZ) */

};

#endif