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/* $OpenBSD: mpu401.c,v 1.1 1999/01/02 00:02:42 niklas 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 <vm/vm.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/isa/mpu401var.h>
#define splaudio() splbio() /* XXX found in audio_if.h normally */
#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 MPU401_NPORT 2
#define MPU_DATA 0
#define MPU_COMMAND 1
#define MPU_RESET 0xff
#define MPU_UART_MODE 0x3f
#define MPU_ACK 0xfe
#define MPU_STATUS 1
#define MPU_OUTPUT_BUSY 0x40
#define MPU_INPUT_EMPTY 0x80
#define MPU_MAXWAIT 10000 /* usec/10 to wait */
#define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))
int mpu401_reset(struct mpu401_softc *);
static __inline int mpu401_waitready(struct mpu401_softc *);
void mpu401_readinput(struct mpu401_softc *);
int
mpu401_find(sc)
struct mpu401_softc *sc;
{
if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) {
DPRINTF(("mpu401_find: No status\n"));
goto bad;
}
sc->open = 0;
sc->intr = 0;
if (mpu401_reset(sc) == 0)
return 1;
bad:
return 0;
}
static __inline int
mpu401_waitready(sc)
struct mpu401_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
mpu401_reset(sc)
struct mpu401_softc *sc;
{
bus_space_tag_t iot = sc->iot;
bus_space_handle_t ioh = sc->ioh;
int i;
int s;
if (mpu401_waitready(sc)) {
DPRINTF(("mpu401_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(("mpu401_reset: No ACK\n"));
return EIO;
}
int
mpu401_open(sc, flags, iintr, ointr, arg)
struct mpu401_softc *sc;
int flags;
void (*iintr)__P((void *, int));
void (*ointr)__P((void *));
void *arg;
{
DPRINTF(("mpu401_open: sc=%p\n", sc));
if (sc->open)
return EBUSY;
if (mpu401_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
mpu401_close(sc)
struct mpu401_softc *sc;
{
DPRINTF(("mpu401_close: sc=%p\n", sc));
sc->open = 0;
sc->intr = 0;
mpu401_reset(sc); /* exit UART mode */
}
void
mpu401_readinput(sc)
struct mpu401_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, ("mpu401_rea: sc=%p 0x%02x\n", sc, data));
if (sc->intr)
sc->intr(sc->arg, data);
}
}
int
mpu401_output(sc, d)
struct mpu401_softc *sc;
int d;
{
int s;
DPRINTFN(3, ("mpu401_output: sc=%p 0x%02x\n", sc, d));
if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) {
s = splaudio();
mpu401_readinput(sc);
splx(s);
}
if (mpu401_waitready(sc)) {
DPRINTF(("mpu401_output: not ready\n"));
return EIO;
}
bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d);
return 0;
}
void
mpu401_intr(sc)
struct mpu401_softc *sc;
{
if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) {
DPRINTF(("mpu401_intr: no data\n"));
return;
}
mpu401_readinput(sc);
}
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