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ast.c revision 1.21 
      1 /*	$NetBSD: ast.c,v 1.21 1996/03/09 01:03:59 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Charles Hannum.  All rights reserved.
      5  *
      6  * This code is derived from public-domain software written by
      7  * Roland McGrath.
      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 Charles Hannum.
     20  * 4. The name of the author may not be used to endorse or promote products
     21  *    derived from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/param.h>
     36 #include <sys/device.h>
     37 
     38 #include <machine/pio.h>
     39 
     40 #include <dev/isa/isavar.h>
     41 #include <dev/isa/comreg.h>
     42 #include <dev/isa/comvar.h>
     43 
     44 #define	NSLAVES	4
     45 
     46 struct ast_softc {
     47 	struct device sc_dev;
     48 	void *sc_ih;
     49 
     50 	int sc_iobase;
     51 	int sc_alive;			/* mask of slave units attached */
     52 	void *sc_slaves[NSLAVES];	/* com device unit numbers */
     53 };
     54 
     55 int astprobe();
     56 void astattach();
     57 int astintr __P((void *));
     58 
     59 struct cfdriver astcd = {
     60 	NULL, "ast", astprobe, astattach, DV_TTY, sizeof(struct ast_softc)
     61 };
     62 
     63 int
     64 astprobe(parent, self, aux)
     65 	struct device *parent, *self;
     66 	void *aux;
     67 {
     68 	struct isa_attach_args *ia = aux;
     69 
     70 	/*
     71 	 * Do the normal com probe for the first UART and assume
     72 	 * its presence means there is a multiport board there.
     73 	 * XXX Needs more robustness.
     74 	 */
     75 	ia->ia_iosize = NSLAVES * COM_NPORTS;
     76 	return (comprobe1(ia->ia_iobase));
     77 }
     78 
     79 int
     80 astsubmatch(parent, match, aux)
     81 	struct device *parent;
     82 	void *match, *aux;
     83 {
     84 	struct ast_softc *sc = (void *)parent;
     85 	struct cfdata *cf = match;
     86 	struct isa_attach_args *ia = aux;
     87 	struct commulti_attach_args *ca = ia->ia_aux;
     88 
     89 	if (cf->cf_loc[0] != -1 && cf->cf_loc[0] != ca->ca_slave)
     90 		return (0);
     91 	return ((*cf->cf_driver->cd_match)(parent, match, ia));
     92 }
     93 
     94 int
     95 astprint(aux, ast)
     96 	void *aux;
     97 	char *ast;
     98 {
     99 	struct isa_attach_args *ia = aux;
    100 	struct commulti_attach_args *ca = ia->ia_aux;
    101 
    102 	printf(" slave %d", ca->ca_slave);
    103 }
    104 
    105 void
    106 astattach(parent, self, aux)
    107 	struct device *parent, *self;
    108 	void *aux;
    109 {
    110 	struct ast_softc *sc = (void *)self;
    111 	struct isa_attach_args *ia = aux;
    112 	struct commulti_attach_args ca;
    113 	struct isa_attach_args isa;
    114 	int subunit;
    115 
    116 	sc->sc_iobase = ia->ia_iobase;
    117 
    118 	/*
    119 	 * Enable the master interrupt.
    120 	 */
    121 	outb(sc->sc_iobase | 0x1f, 0x80);
    122 
    123 	printf("\n");
    124 
    125 	isa.ia_aux = &ca;
    126 	for (ca.ca_slave = 0; ca.ca_slave < NSLAVES; ca.ca_slave++) {
    127 		struct cfdata *cf;
    128 		isa.ia_iobase = sc->sc_iobase + COM_NPORTS * ca.ca_slave;
    129 		isa.ia_iosize = 0x666;
    130 		isa.ia_irq = IRQUNK;
    131 		isa.ia_drq = DRQUNK;
    132 		isa.ia_msize = 0;
    133 		if ((cf = config_search(astsubmatch, self, &isa)) != 0) {
    134 			subunit = cf->cf_unit;	/* can change if unit == * */
    135 			config_attach(self, cf, &isa, astprint);
    136 			sc->sc_slaves[ca.ca_slave] =
    137 			    cf->cf_driver->cd_devs[subunit];
    138 			sc->sc_alive |= 1 << ca.ca_slave;
    139 		}
    140 	}
    141 
    142 	sc->sc_ih = isa_intr_establish(ia->ia_irq, IST_EDGE, IPL_TTY, astintr,
    143 	    sc);
    144 }
    145 
    146 int
    147 astintr(arg)
    148 	void *arg;
    149 {
    150 	struct ast_softc *sc = arg;
    151 	int iobase = sc->sc_iobase;
    152 	int alive = sc->sc_alive;
    153 	int bits;
    154 
    155 	bits = ~inb(iobase | 0x1f) & alive;
    156 	if (bits == 0)
    157 		return (0);
    158 
    159 	for (;;) {
    160 #define	TRY(n) \
    161 		if (bits & (1 << (n))) \
    162 			comintr(sc->sc_slaves[n]);
    163 		TRY(0);
    164 		TRY(1);
    165 		TRY(2);
    166 		TRY(3);
    167 #undef TRY
    168 		bits = ~inb(iobase | 0x1f) & alive;
    169 		if (bits == 0)
    170 			return (1);
    171  	}
    172 }
    173