Annotation of sys/dev/isa/ast.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ast.c,v 1.18 2002/03/14 01:26:56 millert Exp $ */
! 2: /* $NetBSD: ast.c,v 1.28 1996/05/12 23:51:45 mycroft Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
! 6: * Copyright (c) 1995 Charles Hannum. All rights reserved.
! 7: *
! 8: * This code is derived from public-domain software written by
! 9: * Roland McGrath.
! 10: *
! 11: * Redistribution and use in source and binary forms, with or without
! 12: * modification, are permitted provided that the following conditions
! 13: * are met:
! 14: * 1. Redistributions of source code must retain the above copyright
! 15: * notice, this list of conditions and the following disclaimer.
! 16: * 2. Redistributions in binary form must reproduce the above copyright
! 17: * notice, this list of conditions and the following disclaimer in the
! 18: * documentation and/or other materials provided with the distribution.
! 19: * 3. All advertising materials mentioning features or use of this software
! 20: * must display the following acknowledgement:
! 21: * This product includes software developed by Charles Hannum.
! 22: * 4. The name of the author may not be used to endorse or promote products
! 23: * derived from this software without specific prior written permission.
! 24: *
! 25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 35: */
! 36:
! 37: #include <sys/param.h>
! 38: #include <sys/systm.h>
! 39: #include <sys/device.h>
! 40: #include <sys/termios.h>
! 41:
! 42: #include <machine/bus.h>
! 43: #include <machine/intr.h>
! 44:
! 45: #include <dev/isa/isavar.h>
! 46: #include <dev/ic/comreg.h>
! 47: #include <dev/ic/comvar.h>
! 48:
! 49: #define NSLAVES 4
! 50:
! 51: struct ast_softc {
! 52: struct device sc_dev;
! 53: void *sc_ih;
! 54:
! 55: bus_space_tag_t sc_iot;
! 56: int sc_iobase;
! 57:
! 58: int sc_alive; /* mask of slave units attached */
! 59: void *sc_slaves[NSLAVES]; /* com device unit numbers */
! 60: bus_space_handle_t sc_slaveioh[NSLAVES];
! 61: };
! 62:
! 63: int astprobe(struct device *, void *, void *);
! 64: void astattach(struct device *, struct device *, void *);
! 65: int astintr(void *);
! 66: int astprint(void *, const char *);
! 67:
! 68: struct cfattach ast_ca = {
! 69: sizeof(struct ast_softc), astprobe, astattach
! 70: };
! 71:
! 72: struct cfdriver ast_cd = {
! 73: NULL, "ast", DV_TTY
! 74: };
! 75:
! 76: int
! 77: astprobe(parent, self, aux)
! 78: struct device *parent;
! 79: void *self;
! 80: void *aux;
! 81: {
! 82: struct isa_attach_args *ia = aux;
! 83: int iobase = ia->ia_iobase;
! 84: bus_space_tag_t iot = ia->ia_iot;
! 85: bus_space_handle_t ioh;
! 86: int i, rv = 1;
! 87:
! 88: /*
! 89: * Do the normal com probe for the first UART and assume
! 90: * its presence, and the ability to map the other UARTS,
! 91: * means there is a multiport board there.
! 92: * XXX Needs more robustness.
! 93: */
! 94:
! 95: /* if the first port is in use as console, then it. */
! 96: if (iobase == comconsaddr && !comconsattached)
! 97: goto checkmappings;
! 98:
! 99: if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
! 100: rv = 0;
! 101: goto out;
! 102: }
! 103: rv = comprobe1(iot, ioh);
! 104: bus_space_unmap(iot, ioh, COM_NPORTS);
! 105: if (rv == 0)
! 106: goto out;
! 107:
! 108: checkmappings:
! 109: for (i = 1; i < NSLAVES; i++) {
! 110: iobase += COM_NPORTS;
! 111:
! 112: if (iobase == comconsaddr && !comconsattached)
! 113: continue;
! 114:
! 115: if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
! 116: rv = 0;
! 117: goto out;
! 118: }
! 119: bus_space_unmap(iot, ioh, COM_NPORTS);
! 120: }
! 121:
! 122: out:
! 123: if (rv)
! 124: ia->ia_iosize = NSLAVES * COM_NPORTS;
! 125: return (rv);
! 126: }
! 127:
! 128: int
! 129: astprint(aux, pnp)
! 130: void *aux;
! 131: const char *pnp;
! 132: {
! 133: struct commulti_attach_args *ca = aux;
! 134:
! 135: if (pnp)
! 136: printf("com at %s", pnp);
! 137: printf(" slave %d", ca->ca_slave);
! 138: return (UNCONF);
! 139: }
! 140:
! 141: void
! 142: astattach(parent, self, aux)
! 143: struct device *parent, *self;
! 144: void *aux;
! 145: {
! 146: struct ast_softc *sc = (void *)self;
! 147: struct isa_attach_args *ia = aux;
! 148: struct commulti_attach_args ca;
! 149: int i;
! 150:
! 151: sc->sc_iot = ia->ia_iot;
! 152: sc->sc_iobase = ia->ia_iobase;
! 153:
! 154: for (i = 0; i < NSLAVES; i++)
! 155: if (bus_space_map(sc->sc_iot, sc->sc_iobase + i * COM_NPORTS,
! 156: COM_NPORTS, 0, &sc->sc_slaveioh[i]))
! 157: panic("astattach: couldn't map slave %d", i);
! 158:
! 159: /*
! 160: * Enable the master interrupt.
! 161: */
! 162: bus_space_write_1(sc->sc_iot, sc->sc_slaveioh[3], 7, 0x80);
! 163:
! 164: printf("\n");
! 165:
! 166: for (i = 0; i < NSLAVES; i++) {
! 167: ca.ca_slave = i;
! 168: ca.ca_iot = sc->sc_iot;
! 169: ca.ca_ioh = sc->sc_slaveioh[i];
! 170: ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
! 171: ca.ca_noien = 1;
! 172:
! 173: sc->sc_slaves[i] = config_found(self, &ca, astprint);
! 174: if (sc->sc_slaves[i] != NULL)
! 175: sc->sc_alive |= 1 << i;
! 176: }
! 177:
! 178: sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
! 179: IPL_TTY, astintr, sc, sc->sc_dev.dv_xname);
! 180: }
! 181:
! 182: int
! 183: astintr(arg)
! 184: void *arg;
! 185: {
! 186: struct ast_softc *sc = arg;
! 187: bus_space_tag_t iot = sc->sc_iot;
! 188: int alive = sc->sc_alive;
! 189: int bits;
! 190:
! 191: bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
! 192: if (bits == 0)
! 193: return (0);
! 194:
! 195: for (;;) {
! 196: #define TRY(n) \
! 197: if (bits & (1 << (n))) \
! 198: comintr(sc->sc_slaves[n]);
! 199: TRY(0);
! 200: TRY(1);
! 201: TRY(2);
! 202: TRY(3);
! 203: #undef TRY
! 204: bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
! 205: if (bits == 0)
! 206: return (1);
! 207: }
! 208: }
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