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com_isa.c revision 1.11 
      1 /*	$NetBSD: com_isa.c,v 1.11 1998/06/09 07:24:58 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993, 1994, 1995, 1996
      5  *	Charles M. Hannum.  All rights reserved.
      6  * Copyright (c) 1991 The Regents of the University of California.
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	@(#)com.c	7.5 (Berkeley) 5/16/91
     38  */
     39 
     40 #include <sys/param.h>
     41 #include <sys/systm.h>
     42 #include <sys/ioctl.h>
     43 #include <sys/select.h>
     44 #include <sys/tty.h>
     45 #include <sys/proc.h>
     46 #include <sys/user.h>
     47 #include <sys/conf.h>
     48 #include <sys/file.h>
     49 #include <sys/uio.h>
     50 #include <sys/kernel.h>
     51 #include <sys/syslog.h>
     52 #include <sys/types.h>
     53 #include <sys/device.h>
     54 
     55 #include <machine/intr.h>
     56 #include <machine/bus.h>
     57 
     58 #include <dev/ic/comreg.h>
     59 #include <dev/ic/comvar.h>
     60 
     61 #include <dev/isa/isavar.h>
     62 
     63 struct com_isa_softc {
     64 	struct	com_softc sc_com;	/* real "com" softc */
     65 
     66 	/* ISA-specific goo. */
     67 	void	*sc_ih;			/* interrupt handler */
     68 };
     69 
     70 int com_isa_probe __P((struct device *, struct cfdata *, void *));
     71 void com_isa_attach __P((struct device *, struct device *, void *));
     72 void com_isa_cleanup __P((void *));
     73 
     74 struct cfattach com_isa_ca = {
     75 	sizeof(struct com_isa_softc), com_isa_probe, com_isa_attach
     76 };
     77 
     78 int
     79 com_isa_probe(parent, match, aux)
     80 	struct device *parent;
     81 	struct cfdata *match;
     82 	void *aux;
     83 {
     84 	bus_space_tag_t iot;
     85 	bus_space_handle_t ioh;
     86 	int iobase;
     87 	int rv = 1;
     88 	struct isa_attach_args *ia = aux;
     89 
     90 	/* Disallow wildcarded i/o address. */
     91 	if (ia->ia_iobase == ISACF_PORT_DEFAULT)
     92 		return (0);
     93 
     94 	iot = ia->ia_iot;
     95 	iobase = ia->ia_iobase;
     96 
     97 	/* if it's in use as console, it's there. */
     98 	if (!com_is_console(iot, iobase, 0)) {
     99 		if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
    100 			return 0;
    101 		}
    102 		rv = comprobe1(iot, ioh, iobase);
    103 		bus_space_unmap(iot, ioh, COM_NPORTS);
    104 	}
    105 
    106 	if (rv) {
    107 		ia->ia_iosize = COM_NPORTS;
    108 		ia->ia_msize = 0;
    109 	}
    110 	return (rv);
    111 }
    112 
    113 void
    114 com_isa_attach(parent, self, aux)
    115 	struct device *parent, *self;
    116 	void *aux;
    117 {
    118 	struct com_isa_softc *isc = (void *)self;
    119 	struct com_softc *sc = &isc->sc_com;
    120 	int iobase, irq;
    121 	bus_space_tag_t iot;
    122 	struct isa_attach_args *ia = aux;
    123 
    124 	/*
    125 	 * We're living on an isa.
    126 	 */
    127 	iobase = sc->sc_iobase = ia->ia_iobase;
    128 	iot = sc->sc_iot = ia->ia_iot;
    129 	if (!com_is_console(iot, iobase, &sc->sc_ioh) &&
    130 	    bus_space_map(iot, iobase, COM_NPORTS, 0, &sc->sc_ioh)) {
    131 		printf(": can't map i/o space\n");
    132 		return;
    133 	}
    134 
    135 	sc->sc_frequency = COM_FREQ;
    136 	irq = ia->ia_irq;
    137 
    138 	com_attach_subr(sc);
    139 
    140 	if (irq != IRQUNK) {
    141 		isc->sc_ih = isa_intr_establish(ia->ia_ic, irq,
    142 		    IST_EDGE, IPL_SERIAL, comintr, sc);
    143 	}
    144 
    145 	/*
    146 	 * Shutdown hook for buggy BIOSs that don't recognize the UART
    147 	 * without a disabled FIFO.
    148 	 */
    149 	if (shutdownhook_establish(com_isa_cleanup, sc) == NULL)
    150 		panic("com_isa_attach: could not establish shutdown hook");
    151 }
    152 
    153 void
    154 com_isa_cleanup(arg)
    155 	void *arg;
    156 {
    157 	struct com_softc *sc = arg;
    158 
    159 	if (ISSET(sc->sc_hwflags, COM_HW_FIFO))
    160 		bus_space_write_1(sc->sc_iot, sc->sc_ioh, com_fifo, 0);
    161 }
    162