Annotation of sys/dev/isa/mpu401.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mpu401.c,v 1.10 2006/04/07 22:41:33 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: * 3. All advertising materials mentioning features or use of this software
! 20: * must display the following acknowledgement:
! 21: * This product includes software developed by the NetBSD
! 22: * Foundation, Inc. and its contributors.
! 23: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 24: * contributors may be used to endorse or promote products derived
! 25: * from this software without specific prior written permission.
! 26: *
! 27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 37: * POSSIBILITY OF SUCH DAMAGE.
! 38: */
! 39:
! 40: #include <sys/param.h>
! 41: #include <sys/systm.h>
! 42: #include <sys/errno.h>
! 43: #include <sys/ioctl.h>
! 44: #include <sys/syslog.h>
! 45: #include <sys/device.h>
! 46: #include <sys/proc.h>
! 47: #include <sys/buf.h>
! 48:
! 49: #include <machine/cpu.h>
! 50: #include <machine/intr.h>
! 51: #include <machine/bus.h>
! 52:
! 53: #include <dev/midi_if.h>
! 54:
! 55: #include <dev/isa/isavar.h>
! 56: #include <dev/isa/isadmavar.h>
! 57:
! 58: #include <dev/ic/mpuvar.h>
! 59:
! 60: #ifndef splaudio
! 61: #define splaudio() splbio() /* XXX found in audio_if.h normally */
! 62: #endif
! 63:
! 64: #ifdef AUDIO_DEBUG
! 65: #define DPRINTF(x) if (mpu401debug) printf x
! 66: #define DPRINTFN(n,x) if (mpu401debug >= (n)) printf x
! 67: int mpu401debug = 0;
! 68: #else
! 69: #define DPRINTF(x)
! 70: #define DPRINTFN(n,x)
! 71: #endif
! 72:
! 73: #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))
! 74:
! 75: int mpu_reset(struct mpu_softc *);
! 76: static __inline int mpu_waitready(struct mpu_softc *);
! 77: void mpu_readinput(struct mpu_softc *);
! 78:
! 79: struct cfdriver mpu_cd = {
! 80: NULL, "mpu", DV_DULL
! 81: };
! 82:
! 83: struct midi_hw_if mpu_midi_hw_if = {
! 84: mpu_open,
! 85: mpu_close,
! 86: mpu_output,
! 87: 0, /* flush */
! 88: mpu_getinfo,
! 89: 0, /* ioctl */
! 90: };
! 91:
! 92: int
! 93: mpu_find(v)
! 94: void *v;
! 95: {
! 96: struct mpu_softc *sc = v;
! 97:
! 98: if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) {
! 99: DPRINTF(("mpu_find: No status\n"));
! 100: goto bad;
! 101: }
! 102: sc->open = 0;
! 103: sc->intr = 0;
! 104: if (mpu_reset(sc) == 0)
! 105: return 1;
! 106: bad:
! 107: return 0;
! 108: }
! 109:
! 110: static __inline int
! 111: mpu_waitready(sc)
! 112: struct mpu_softc *sc;
! 113: {
! 114: int i;
! 115:
! 116: for(i = 0; i < MPU_MAXWAIT; i++) {
! 117: if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY))
! 118: return 0;
! 119: delay(10);
! 120: }
! 121: return 1;
! 122: }
! 123:
! 124: int
! 125: mpu_reset(sc)
! 126: struct mpu_softc *sc;
! 127: {
! 128: bus_space_tag_t iot = sc->iot;
! 129: bus_space_handle_t ioh = sc->ioh;
! 130: int i;
! 131: int s;
! 132:
! 133: if (mpu_waitready(sc)) {
! 134: DPRINTF(("mpu_reset: not ready\n"));
! 135: return EIO;
! 136: }
! 137: s = splaudio(); /* Don't let the interrupt get our ACK. */
! 138: bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET);
! 139: for(i = 0; i < 2*MPU_MAXWAIT; i++) {
! 140: if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) &&
! 141: bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) {
! 142: splx(s);
! 143: return 0;
! 144: }
! 145: }
! 146: splx(s);
! 147: DPRINTF(("mpu_reset: No ACK\n"));
! 148: return EIO;
! 149: }
! 150:
! 151: int
! 152: mpu_open(v, flags, iintr, ointr, arg)
! 153: void *v;
! 154: int flags;
! 155: void (*iintr)(void *, int);
! 156: void (*ointr)(void *);
! 157: void *arg;
! 158: {
! 159: struct mpu_softc *sc = v;
! 160:
! 161: DPRINTF(("mpu_open: sc=%p\n", sc));
! 162:
! 163: if (sc->open)
! 164: return EBUSY;
! 165: if (mpu_reset(sc) != 0)
! 166: return EIO;
! 167:
! 168: bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE);
! 169: sc->open = 1;
! 170: sc->intr = iintr;
! 171: sc->arg = arg;
! 172: return 0;
! 173: }
! 174:
! 175: void
! 176: mpu_close(v)
! 177: void *v;
! 178: {
! 179: struct mpu_softc *sc = v;
! 180:
! 181: DPRINTF(("mpu_close: sc=%p\n", sc));
! 182:
! 183: sc->open = 0;
! 184: sc->intr = 0;
! 185: mpu_reset(sc); /* exit UART mode */
! 186: }
! 187:
! 188: void
! 189: mpu_readinput(sc)
! 190: struct mpu_softc *sc;
! 191: {
! 192: bus_space_tag_t iot = sc->iot;
! 193: bus_space_handle_t ioh = sc->ioh;
! 194: int data;
! 195:
! 196: while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) {
! 197: data = bus_space_read_1(iot, ioh, MPU_DATA);
! 198: DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data));
! 199: if (sc->intr)
! 200: sc->intr(sc->arg, data);
! 201: }
! 202: }
! 203:
! 204: int
! 205: mpu_output(v, d)
! 206: void *v;
! 207: int d;
! 208: {
! 209: struct mpu_softc *sc = v;
! 210: int s;
! 211:
! 212: DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d));
! 213: if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) {
! 214: s = splaudio();
! 215: mpu_readinput(sc);
! 216: splx(s);
! 217: }
! 218: if (mpu_waitready(sc)) {
! 219: DPRINTF(("mpu_output: not ready\n"));
! 220: return EIO;
! 221: }
! 222: bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d);
! 223: return 0;
! 224: }
! 225:
! 226: void
! 227: mpu_getinfo(addr, mi)
! 228: void *addr;
! 229: struct midi_info *mi;
! 230: {
! 231: mi->name = "MPU-401 MIDI UART";
! 232: mi->props = 0;
! 233: }
! 234:
! 235: int
! 236: mpu_intr(v)
! 237: void *v;
! 238: {
! 239: struct mpu_softc *sc = v;
! 240:
! 241: if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) {
! 242: DPRINTF(("mpu_intr: no data\n"));
! 243: return 0;
! 244: }
! 245: mpu_readinput(sc);
! 246: return 1;
! 247: }
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