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z8530sc.h revision 1.2 
      1 /*	$NetBSD: z8530sc.h,v 1.2 1996/04/10 21:44:44 gwr Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Gordon W. Ross
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This software was developed by the Computer Systems Engineering group
      9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
     10  * contributed to Berkeley.
     11  *
     12  * All advertising materials mentioning features or use of this software
     13  * must display the following acknowledgement:
     14  *	This product includes software developed by the University of
     15  *	California, Lawrence Berkeley Laboratory.
     16  *
     17  * Redistribution and use in source and binary forms, with or without
     18  * modification, are permitted provided that the following conditions
     19  * are met:
     20  * 1. Redistributions of source code must retain the above copyright
     21  *    notice, this list of conditions and the following disclaimer.
     22  * 2. Redistributions in binary form must reproduce the above copyright
     23  *    notice, this list of conditions and the following disclaimer in the
     24  *    documentation and/or other materials provided with the distribution.
     25  * 3. All advertising materials mentioning features or use of this software
     26  *    must display the following acknowledgement:
     27  *	This product includes software developed by the University of
     28  *	California, Berkeley and its contributors.
     29  * 4. Neither the name of the University nor the names of its contributors
     30  *    may be used to endorse or promote products derived from this software
     31  *    without specific prior written permission.
     32  *
     33  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     43  * SUCH DAMAGE.
     44  *
     45  *	@(#)zsvar.h	8.1 (Berkeley) 6/11/93
     46  */
     47 
     48 
     49 /*
     50  * Function vector - per channel
     51  */
     52 struct zsops {
     53 	void	(*zsop_rxint)();	/* receive char available */
     54 	void	(*zsop_stint)();	/* external/status */
     55 	void	(*zsop_txint)();	/* xmit buffer empty */
     56 	void	(*zsop_softint)();	/* process software interrupt */
     57 };
     58 
     59 extern struct zsops zsops_null;
     60 
     61 
     62 /*
     63  * Software state, per zs channel.
     64  */
     65 struct zs_chanstate {
     66 
     67 	/* Pointers to the device registers. */
     68 	volatile u_char	*cs_reg_csr; 	/* ctrl, status, and reg. number. */
     69 	volatile u_char	*cs_reg_data;	/* data or numbered register */
     70 
     71 	int	cs_channel;		/* sub-unit number */
     72 	void *cs_private;	/* sub-driver data pointer */
     73 	struct zsops *cs_ops;
     74 
     75 	int cs_pclk_div16;		/* PCLK / 16 */
     76 	int	cs_defspeed;		/* default baud rate (from PROM) */
     77 
     78 	/*
     79 	 * We must keep a copy of the write registers as they are
     80 	 * mostly write-only and we sometimes need to set and clear
     81 	 * individual bits (e.g., in WR3).  Not all of these are
     82 	 * needed but 16 bytes is cheap and this makes the addressing
     83 	 * simpler.  Unfortunately, we can only write to some registers
     84 	 * when the chip is not actually transmitting, so whenever
     85 	 * we are expecting a `transmit done' interrupt the preg array
     86 	 * is allowed to `get ahead' of the current values.  In a
     87 	 * few places we must change the current value of a register,
     88 	 * rather than (or in addition to) the pending value; for these
     89 	 * cs_creg[] contains the current value.
     90 	 */
     91 	u_char	cs_creg[16];		/* current values */
     92 	u_char	cs_preg[16];		/* pending values */
     93 
     94 	u_char	cs_heldchange;		/* change pending (creg != preg) */
     95 	u_char	cs_rr0;			/* last rr0 processed */
     96 	u_char	cs_rr0_new; 	/* rr0 saved in status interrupt. */
     97 
     98 	char	cs_softreq;		/* need soft interrupt call */
     99 };
    100 
    101 struct zsc_softc {
    102 	struct	device zsc_dev;		/* required first: base device */
    103 	struct	zs_chanstate zsc_cs[2];	/* channel A and B soft state */
    104 };
    105 
    106 struct zsc_attach_args {
    107 	int channel;	/* two serial channels per zsc */
    108 	int hwflags;
    109 };
    110 #define ZS_HWFLAG_CONSOLE 1
    111 
    112