1 /* $OpenBSD: mpu401.c,v 1.15 2015/03/14 03:38:47 jsg 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/buf.h> 40 41 #include <machine/cpu.h> 42 #include <machine/intr.h> 43 #include <machine/bus.h> 44 45 #include <dev/audio_if.h> 46 #include <dev/midi_if.h> 47 48 #include <dev/isa/isavar.h> 49 50 #include <dev/ic/mpuvar.h> 51 52 #ifdef AUDIO_DEBUG 53 #define DPRINTF(x) if (mpu401debug) printf x 54 #define DPRINTFN(n,x) if (mpu401debug >= (n)) printf x 55 int mpu401debug = 0; 56 #else 57 #define DPRINTF(x) 58 #define DPRINTFN(n,x) 59 #endif 60 61 #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS)) 62 63 int mpu_reset(struct mpu_softc *); 64 static __inline int mpu_waitready(struct mpu_softc *); 65 void mpu_readinput(struct mpu_softc *); 66 67 struct cfdriver mpu_cd = { 68 NULL, "mpu", DV_DULL 69 }; 70 71 struct midi_hw_if mpu_midi_hw_if = { 72 mpu_open, 73 mpu_close, 74 mpu_output, 75 0, /* flush */ 76 mpu_getinfo, 77 0, /* ioctl */ 78 }; 79 80 int 81 mpu_find(v) 82 void *v; 83 { 84 struct mpu_softc *sc = v; 85 86 if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) { 87 DPRINTF(("mpu_find: No status\n")); 88 goto bad; 89 } 90 sc->open = 0; 91 sc->intr = 0; 92 if (mpu_reset(sc) == 0) 93 return 1; 94 bad: 95 return 0; 96 } 97 98 static __inline int 99 mpu_waitready(sc) 100 struct mpu_softc *sc; 101 { 102 int i; 103 104 for(i = 0; i < MPU_MAXWAIT; i++) { 105 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY)) 106 return 0; 107 delay(10); 108 } 109 return 1; 110 } 111 112 int 113 mpu_reset(sc) 114 struct mpu_softc *sc; 115 { 116 bus_space_tag_t iot = sc->iot; 117 bus_space_handle_t ioh = sc->ioh; 118 int i; 119 120 if (mpu_waitready(sc)) { 121 DPRINTF(("mpu_reset: not ready\n")); 122 return EIO; 123 } 124 mtx_enter(&audio_lock); /* Don't let the interrupt get our ACK. */ 125 bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET); 126 for(i = 0; i < 2*MPU_MAXWAIT; i++) { 127 if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) && 128 bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) { 129 mtx_leave(&audio_lock); 130 return 0; 131 } 132 } 133 mtx_leave(&audio_lock); 134 DPRINTF(("mpu_reset: No ACK\n")); 135 return EIO; 136 } 137 138 int 139 mpu_open(v, flags, iintr, ointr, arg) 140 void *v; 141 int flags; 142 void (*iintr)(void *, int); 143 void (*ointr)(void *); 144 void *arg; 145 { 146 struct mpu_softc *sc = v; 147 148 DPRINTF(("mpu_open: sc=%p\n", sc)); 149 150 if (sc->open) 151 return EBUSY; 152 if (mpu_reset(sc) != 0) 153 return EIO; 154 155 bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE); 156 sc->open = 1; 157 sc->intr = iintr; 158 sc->arg = arg; 159 return 0; 160 } 161 162 void 163 mpu_close(v) 164 void *v; 165 { 166 struct mpu_softc *sc = v; 167 168 DPRINTF(("mpu_close: sc=%p\n", sc)); 169 170 sc->open = 0; 171 sc->intr = 0; 172 mpu_reset(sc); /* exit UART mode */ 173 } 174 175 void 176 mpu_readinput(sc) 177 struct mpu_softc *sc; 178 { 179 bus_space_tag_t iot = sc->iot; 180 bus_space_handle_t ioh = sc->ioh; 181 int data; 182 183 while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) { 184 data = bus_space_read_1(iot, ioh, MPU_DATA); 185 DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data)); 186 if (sc->intr) 187 sc->intr(sc->arg, data); 188 } 189 } 190 191 /* 192 * called with audio_lock 193 */ 194 int 195 mpu_output(v, d) 196 void *v; 197 int d; 198 { 199 struct mpu_softc *sc = v; 200 201 DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d)); 202 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) { 203 mpu_readinput(sc); 204 } 205 if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY) 206 delay(10); 207 if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY) 208 return 0; 209 bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d); 210 return 1; 211 } 212 213 void 214 mpu_getinfo(addr, mi) 215 void *addr; 216 struct midi_info *mi; 217 { 218 mi->name = "MPU-401 MIDI UART"; 219 mi->props = 0; 220 } 221 222 int 223 mpu_intr(v) 224 void *v; 225 { 226 struct mpu_softc *sc = v; 227 228 mtx_enter(&audio_lock); 229 if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) { 230 mtx_leave(&audio_lock); 231 DPRINTF(("mpu_intr: no data\n")); 232 return 0; 233 } 234 mpu_readinput(sc); 235 mtx_leave(&audio_lock); 236 return 1; 237 } 238