/* $OpenBSD: mpu401.c,v 1.11 2008/06/26 05:42:16 ray Exp $ */ /* $NetBSD: mpu401.c,v 1.3 1998/11/25 22:17:06 augustss Exp $ */ /* * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Lennart Augustsson (augustss@netbsd.org). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/errno.h> #include <sys/ioctl.h> #include <sys/syslog.h> #include <sys/device.h> #include <sys/proc.h> #include <sys/buf.h> #include <machine/cpu.h> #include <machine/intr.h> #include <machine/bus.h> #include <dev/midi_if.h> #include <dev/isa/isavar.h> #include <dev/isa/isadmavar.h> #include <dev/ic/mpuvar.h> #ifndef splaudio #define splaudio() splbio() /* XXX found in audio_if.h normally */ #endif #ifdef AUDIO_DEBUG #define DPRINTF(x) if (mpu401debug) printf x #define DPRINTFN(n,x) if (mpu401debug >= (n)) printf x int mpu401debug = 0; #else #define DPRINTF(x) #define DPRINTFN(n,x) #endif #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS)) int mpu_reset(struct mpu_softc *); static __inline int mpu_waitready(struct mpu_softc *); void mpu_readinput(struct mpu_softc *); struct cfdriver mpu_cd = { NULL, "mpu", DV_DULL }; struct midi_hw_if mpu_midi_hw_if = { mpu_open, mpu_close, mpu_output, 0, /* flush */ mpu_getinfo, 0, /* ioctl */ }; int mpu_find(v) void *v; { struct mpu_softc *sc = v; if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) { DPRINTF(("mpu_find: No status\n")); goto bad; } sc->open = 0; sc->intr = 0; if (mpu_reset(sc) == 0) return 1; bad: return 0; } static __inline int mpu_waitready(sc) struct mpu_softc *sc; { int i; for(i = 0; i < MPU_MAXWAIT; i++) { if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY)) return 0; delay(10); } return 1; } int mpu_reset(sc) struct mpu_softc *sc; { bus_space_tag_t iot = sc->iot; bus_space_handle_t ioh = sc->ioh; int i; int s; if (mpu_waitready(sc)) { DPRINTF(("mpu_reset: not ready\n")); return EIO; } s = splaudio(); /* Don't let the interrupt get our ACK. */ bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET); for(i = 0; i < 2*MPU_MAXWAIT; i++) { if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) && bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) { splx(s); return 0; } } splx(s); DPRINTF(("mpu_reset: No ACK\n")); return EIO; } int mpu_open(v, flags, iintr, ointr, arg) void *v; int flags; void (*iintr)(void *, int); void (*ointr)(void *); void *arg; { struct mpu_softc *sc = v; DPRINTF(("mpu_open: sc=%p\n", sc)); if (sc->open) return EBUSY; if (mpu_reset(sc) != 0) return EIO; bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE); sc->open = 1; sc->intr = iintr; sc->arg = arg; return 0; } void mpu_close(v) void *v; { struct mpu_softc *sc = v; DPRINTF(("mpu_close: sc=%p\n", sc)); sc->open = 0; sc->intr = 0; mpu_reset(sc); /* exit UART mode */ } void mpu_readinput(sc) struct mpu_softc *sc; { bus_space_tag_t iot = sc->iot; bus_space_handle_t ioh = sc->ioh; int data; while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) { data = bus_space_read_1(iot, ioh, MPU_DATA); DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data)); if (sc->intr) sc->intr(sc->arg, data); } } int mpu_output(v, d) void *v; int d; { struct mpu_softc *sc = v; int s; DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d)); if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) { s = splaudio(); mpu_readinput(sc); splx(s); } if (mpu_waitready(sc)) { DPRINTF(("mpu_output: not ready\n")); return EIO; } bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d); return 0; } void mpu_getinfo(addr, mi) void *addr; struct midi_info *mi; { mi->name = "MPU-401 MIDI UART"; mi->props = 0; } int mpu_intr(v) void *v; { struct mpu_softc *sc = v; if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) { DPRINTF(("mpu_intr: no data\n")); return 0; } mpu_readinput(sc); return 1; }