Annotation of sys/dev/isa/mpu_isa.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mpu_isa.c,v 1.3 2003/01/29 20:35:13 mickey Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2002 Sergey Smitienko. All rights reserved.
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: * 3. The name of the author may not be used to endorse or promote products
! 15: * derived from this software without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 18: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 19: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 20: * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
! 21: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
! 22: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
! 23: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
! 25: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 26: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
! 27: * OF THE POSSIBILITY OF SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <sys/param.h>
! 31: #include <sys/systm.h>
! 32: #include <sys/errno.h>
! 33: #include <sys/ioctl.h>
! 34: #include <sys/syslog.h>
! 35: #include <sys/device.h>
! 36: #include <sys/proc.h>
! 37:
! 38: #include <machine/bus.h>
! 39:
! 40: #include <sys/audioio.h>
! 41: #include <dev/audio_if.h>
! 42: #include <dev/midi_if.h>
! 43:
! 44: #include <dev/isa/isavar.h>
! 45: #include <dev/isa/isadmavar.h>
! 46:
! 47: #include <dev/ic/mpuvar.h>
! 48:
! 49: int mpu_isa_match(struct device *, void *, void *);
! 50: void mpu_isa_attach(struct device *, struct device *, void *);
! 51: int mpu_test(bus_space_tag_t, int);
! 52:
! 53: #ifdef AUDIO_DEBUG
! 54: #define DPRINTF(x) if (mpu_debug) printf x
! 55: int mpu_debug = 0;
! 56: #else
! 57: #define DPRINTF(x)
! 58: #endif
! 59:
! 60: #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))
! 61:
! 62: struct mpu_isa_softc {
! 63: struct device sc_dev;
! 64:
! 65: struct mpu_softc sc_mpu;
! 66: };
! 67:
! 68: struct cfattach mpu_isa_ca = {
! 69: sizeof(struct mpu_isa_softc), mpu_isa_match, mpu_isa_attach
! 70: };
! 71:
! 72: int
! 73: mpu_test (iot, iobase)
! 74: bus_space_tag_t iot;
! 75: int iobase; /* base port number to try */
! 76: {
! 77: bus_space_handle_t ioh;
! 78: int i, rc;
! 79:
! 80: rc = 0;
! 81: if (bus_space_map(iot, iobase, MPU401_NPORT, 0, &ioh)) {
! 82: DPRINTF(("mpu_test: can`t map: %x/2\n", iobase));
! 83: return (0);
! 84: }
! 85:
! 86: DPRINTF(("mpu_test: trying: %x\n", iobase));
! 87:
! 88: /*
! 89: * The following code is a shameless copy of mpu401.c
! 90: * it is here until a redesign of mpu_find() interface
! 91: */
! 92:
! 93: if (MPU_GETSTATUS(iot, ioh) == 0xff)
! 94: goto done;
! 95:
! 96: for (i = 0; i < MPU_MAXWAIT; i++) {
! 97: if (!(MPU_GETSTATUS(iot, ioh) & MPU_OUTPUT_BUSY)) {
! 98: rc = 1;
! 99: break;
! 100: }
! 101: delay (10);
! 102: }
! 103:
! 104: if (rc == 1) {
! 105: bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET);
! 106: rc = 0;
! 107: for (i = 0; i < 2 * MPU_MAXWAIT; i++)
! 108: if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) &&
! 109: bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) {
! 110: rc = 1;
! 111: break;
! 112: }
! 113: }
! 114: done:
! 115: bus_space_unmap(iot, ioh, MPU401_NPORT);
! 116:
! 117: return (rc);
! 118: }
! 119:
! 120: int
! 121: mpu_isa_match(parent, match, aux)
! 122: struct device *parent;
! 123: void *match, *aux;
! 124: {
! 125: struct isa_attach_args *ia = aux;
! 126:
! 127: if (mpu_test(ia->ia_iot, ia->ia_iobase)) {
! 128: ia->ia_iosize = MPU401_NPORT;
! 129: return (1);
! 130: }
! 131:
! 132: return (0);
! 133: }
! 134:
! 135: void
! 136: mpu_isa_attach(parent, self, aux)
! 137: struct device *parent, *self;
! 138: void *aux;
! 139: {
! 140: struct mpu_isa_softc *sc = (struct mpu_isa_softc *)self;
! 141: struct isa_attach_args *ia = aux;
! 142:
! 143: sc->sc_mpu.iot = ia->ia_iot;
! 144:
! 145: if (bus_space_map (ia->ia_iot, ia->ia_iobase, MPU401_NPORT,
! 146: 0, &sc->sc_mpu.ioh)) {
! 147: printf(": can`t map i/o space\n");
! 148: return;
! 149: }
! 150:
! 151: if (!mpu_find(&sc->sc_mpu)) {
! 152: printf(": find failed\n");
! 153: return;
! 154: }
! 155:
! 156: printf(": generic MPU-401 compatible\n");
! 157:
! 158: midi_attach_mi(&mpu_midi_hw_if, &sc->sc_mpu, &sc->sc_dev);
! 159: }
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