1 /* $OpenBSD: mpu_isa.c,v 1.7 2021/03/07 06:17:04 jsg 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 37 #include <machine/bus.h> 38 39 #include <sys/audioio.h> 40 #include <dev/midi_if.h> 41 42 #include <dev/isa/isavar.h> 43 #include <dev/isa/isadmavar.h> 44 45 #include <dev/ic/mpuvar.h> 46 47 int mpu_isa_match(struct device *, void *, void *); 48 void mpu_isa_attach(struct device *, struct device *, void *); 49 int mpu_test(bus_space_tag_t, int); 50 51 #ifdef AUDIO_DEBUG 52 #define DPRINTF(x) if (mpu_debug) printf x 53 int mpu_debug = 0; 54 #else 55 #define DPRINTF(x) 56 #endif 57 58 #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS)) 59 60 struct mpu_isa_softc { 61 struct device sc_dev; 62 63 struct mpu_softc sc_mpu; 64 }; 65 66 struct cfattach mpu_isa_ca = { 67 sizeof(struct mpu_isa_softc), mpu_isa_match, mpu_isa_attach 68 }; 69 70 int 71 mpu_test(bus_space_tag_t iot, int iobase) /* base port number to try */ 72 { 73 bus_space_handle_t ioh; 74 int i, rc; 75 76 rc = 0; 77 if (bus_space_map(iot, iobase, MPU401_NPORT, 0, &ioh)) { 78 DPRINTF(("mpu_test: can't map: %x/2\n", iobase)); 79 return (0); 80 } 81 82 DPRINTF(("mpu_test: trying: %x\n", iobase)); 83 84 /* 85 * The following code is a shameless copy of mpu401.c 86 * it is here until a redesign of mpu_find() interface 87 */ 88 89 if (MPU_GETSTATUS(iot, ioh) == 0xff) 90 goto done; 91 92 for (i = 0; i < MPU_MAXWAIT; i++) { 93 if (!(MPU_GETSTATUS(iot, ioh) & MPU_OUTPUT_BUSY)) { 94 rc = 1; 95 break; 96 } 97 delay (10); 98 } 99 100 if (rc == 1) { 101 bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET); 102 rc = 0; 103 for (i = 0; i < 2 * MPU_MAXWAIT; i++) 104 if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) && 105 bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) { 106 rc = 1; 107 break; 108 } 109 } 110 done: 111 bus_space_unmap(iot, ioh, MPU401_NPORT); 112 113 return (rc); 114 } 115 116 int 117 mpu_isa_match(struct device *parent, void *match, void *aux) 118 { 119 struct isa_attach_args *ia = aux; 120 121 if (mpu_test(ia->ia_iot, ia->ia_iobase)) { 122 ia->ia_iosize = MPU401_NPORT; 123 return (1); 124 } 125 126 return (0); 127 } 128 129 void 130 mpu_isa_attach(struct device *parent, struct device *self, void *aux) 131 { 132 struct mpu_isa_softc *sc = (struct mpu_isa_softc *)self; 133 struct isa_attach_args *ia = aux; 134 135 sc->sc_mpu.iot = ia->ia_iot; 136 137 if (bus_space_map (ia->ia_iot, ia->ia_iobase, MPU401_NPORT, 138 0, &sc->sc_mpu.ioh)) { 139 printf(": can't map i/o space\n"); 140 return; 141 } 142 143 if (!mpu_find(&sc->sc_mpu)) { 144 printf(": find failed\n"); 145 return; 146 } 147 148 printf(": generic MPU-401 compatible\n"); 149 150 midi_attach_mi(&mpu_midi_hw_if, &sc->sc_mpu, &sc->sc_dev); 151 } 152