1 /* $OpenBSD: mpu401.c,v 1.11 2008/06/26 05:42:16 ray Exp $ */ 2 /* $NetBSD: mpu401.c,v 1.3 1998/11/25 22:17:06 augustss Exp $ */ 3 4 /* 5 * Copyright (c) 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Lennart Augustsson (augustss@netbsd.org). 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/errno.h> 36 #include <sys/ioctl.h> 37 #include <sys/syslog.h> 38 #include <sys/device.h> 39 #include <sys/proc.h> 40 #include <sys/buf.h> 41 42 #include <machine/cpu.h> 43 #include <machine/intr.h> 44 #include <machine/bus.h> 45 46 #include <dev/midi_if.h> 47 48 #include <dev/isa/isavar.h> 49 #include <dev/isa/isadmavar.h> 50 51 #include <dev/ic/mpuvar.h> 52 53 #ifndef splaudio 54 #define splaudio() splbio() /* XXX found in audio_if.h normally */ 55 #endif 56 57 #ifdef AUDIO_DEBUG 58 #define DPRINTF(x) if (mpu401debug) printf x 59 #define DPRINTFN(n,x) if (mpu401debug >= (n)) printf x 60 int mpu401debug = 0; 61 #else 62 #define DPRINTF(x) 63 #define DPRINTFN(n,x) 64 #endif 65 66 #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS)) 67 68 int mpu_reset(struct mpu_softc *); 69 static __inline int mpu_waitready(struct mpu_softc *); 70 void mpu_readinput(struct mpu_softc *); 71 72 struct cfdriver mpu_cd = { 73 NULL, "mpu", DV_DULL 74 }; 75 76 struct midi_hw_if mpu_midi_hw_if = { 77 mpu_open, 78 mpu_close, 79 mpu_output, 80 0, /* flush */ 81 mpu_getinfo, 82 0, /* ioctl */ 83 }; 84 85 int 86 mpu_find(v) 87 void *v; 88 { 89 struct mpu_softc *sc = v; 90 91 if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) { 92 DPRINTF(("mpu_find: No status\n")); 93 goto bad; 94 } 95 sc->open = 0; 96 sc->intr = 0; 97 if (mpu_reset(sc) == 0) 98 return 1; 99 bad: 100 return 0; 101 } 102 103 static __inline int 104 mpu_waitready(sc) 105 struct mpu_softc *sc; 106 { 107 int i; 108 109 for(i = 0; i < MPU_MAXWAIT; i++) { 110 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY)) 111 return 0; 112 delay(10); 113 } 114 return 1; 115 } 116 117 int 118 mpu_reset(sc) 119 struct mpu_softc *sc; 120 { 121 bus_space_tag_t iot = sc->iot; 122 bus_space_handle_t ioh = sc->ioh; 123 int i; 124 int s; 125 126 if (mpu_waitready(sc)) { 127 DPRINTF(("mpu_reset: not ready\n")); 128 return EIO; 129 } 130 s = splaudio(); /* Don't let the interrupt get our ACK. */ 131 bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET); 132 for(i = 0; i < 2*MPU_MAXWAIT; i++) { 133 if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) && 134 bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) { 135 splx(s); 136 return 0; 137 } 138 } 139 splx(s); 140 DPRINTF(("mpu_reset: No ACK\n")); 141 return EIO; 142 } 143 144 int 145 mpu_open(v, flags, iintr, ointr, arg) 146 void *v; 147 int flags; 148 void (*iintr)(void *, int); 149 void (*ointr)(void *); 150 void *arg; 151 { 152 struct mpu_softc *sc = v; 153 154 DPRINTF(("mpu_open: sc=%p\n", sc)); 155 156 if (sc->open) 157 return EBUSY; 158 if (mpu_reset(sc) != 0) 159 return EIO; 160 161 bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE); 162 sc->open = 1; 163 sc->intr = iintr; 164 sc->arg = arg; 165 return 0; 166 } 167 168 void 169 mpu_close(v) 170 void *v; 171 { 172 struct mpu_softc *sc = v; 173 174 DPRINTF(("mpu_close: sc=%p\n", sc)); 175 176 sc->open = 0; 177 sc->intr = 0; 178 mpu_reset(sc); /* exit UART mode */ 179 } 180 181 void 182 mpu_readinput(sc) 183 struct mpu_softc *sc; 184 { 185 bus_space_tag_t iot = sc->iot; 186 bus_space_handle_t ioh = sc->ioh; 187 int data; 188 189 while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) { 190 data = bus_space_read_1(iot, ioh, MPU_DATA); 191 DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data)); 192 if (sc->intr) 193 sc->intr(sc->arg, data); 194 } 195 } 196 197 int 198 mpu_output(v, d) 199 void *v; 200 int d; 201 { 202 struct mpu_softc *sc = v; 203 int s; 204 205 DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d)); 206 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) { 207 s = splaudio(); 208 mpu_readinput(sc); 209 splx(s); 210 } 211 if (mpu_waitready(sc)) { 212 DPRINTF(("mpu_output: not ready\n")); 213 return EIO; 214 } 215 bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d); 216 return 0; 217 } 218 219 void 220 mpu_getinfo(addr, mi) 221 void *addr; 222 struct midi_info *mi; 223 { 224 mi->name = "MPU-401 MIDI UART"; 225 mi->props = 0; 226 } 227 228 int 229 mpu_intr(v) 230 void *v; 231 { 232 struct mpu_softc *sc = v; 233 234 if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) { 235 DPRINTF(("mpu_intr: no data\n")); 236 return 0; 237 } 238 mpu_readinput(sc); 239 return 1; 240 } 241