/*      $NetBSD: dlreg.h,v 1.6 2005/12/11 12:23:29 christos Exp $       */
/*
 * Ben Harris, 1997
 *
 * This file is in the Public Domain.
 */
/*
 * dlreg.h -- Definitions for the DL11 and DLV11 serial cards.
 *
 * Style in imitation of dzreg.h.
 */

#ifdef notdef
union w_b
{
        u_short word;
        struct {
                u_char byte_lo;
                u_char byte_hi;
        } bytes;
};

struct DLregs
{
        volatile u_short dl_rcsr; /* Receive Control/Status Register (R/W) */
        volatile u_short dl_rbuf; /* Receive Buffer (R) */
        volatile u_short dl_xcsr; /* Transmit Control/Status Register (R/W) */
        volatile union w_b u_xbuf; /* Transmit Buffer (W) */
#define dl_xbuf u_xbuf.bytes.byte_lo
};

typedef struct DLregs dlregs;
#endif

#define DL_UBA_RCSR     0
#define DL_UBA_RBUF     2
#define DL_UBA_XCSR     4
#define DL_UBA_XBUFL    6

/* RCSR bits */

#define DL_RCSR_RX_DONE         0x0080 /* Receiver Done (R) */
#define DL_RCSR_RXIE            0x0040 /* Receiver Interrupt Enable (R/W) */
#define DL_RCSR_READER_ENABLE   0x0001 /* [paper-tape] Reader Enable (W) */
#define DL_RCSR_BITS            "\20\1READER_ENABLE\7RXIE\10RX_DONE\n"

/* RBUF bits */

#define DL_RBUF_ERR             0x8000 /* Error (R) */
#define DL_RBUF_OVERRUN_ERR     0x4000 /* Overrun Error (R) */
#define DL_RBUF_FRAMING_ERR     0x2000 /* Framing Error (R) */
#define DL_RBUF_PARITY_ERR      0x1000 /* Parity Error (R) */
#define DL_RBUF_DATA_MASK       0x00FF /* Receive Data (R) */
#define DL_RBUF_BITS    "\20\15PARITY_ERR\16FRAMING_ERR\17OVERRUN_ERR\20ERR\n"

/* XCSR bits */

#define DL_XCSR_TX_READY        0x0080 /* Transmitter Ready (R) */
#define DL_XCSR_TXIE            0x0040 /* Transmit Interrupt Enable (R/W) */
#define DL_XCSR_TX_BREAK        0x0001 /* Transmit Break (R/W) */
#define DL_XCSR_BITS            "\20\1TX_BREAK\7TXIE\10TX_READY\n"

/* XBUF is just data byte right justified. */