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/* $NetBSD: mpu.c,v 1.19 2012/01/21 16:49:26 chs Exp $ */
/*
* Copyright (c) 1998, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson (augustss@NetBSD.org) and by Andrew Doran.
*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mpu.c,v 1.19 2012/01/21 16:49:26 chs Exp $");
#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 <sys/cpu.h>
#include <sys/intr.h>
#include <sys/bus.h>
#include <dev/midi_if.h>
#include <dev/ic/mpuvar.h>
#ifdef AUDIO_DEBUG
#define DPRINTF(x) if (mpudebug) printf x
#define DPRINTFN(n,x) if (mpudebug >= (n)) printf x
int mpudebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif
#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))
static int mpu_reset(struct mpu_softc *);
static inline int mpu_waitready(struct mpu_softc *);
static void mpu_readinput(struct mpu_softc *);
static int mpu_open(void *, int,
void (*iintr)(void *, int),
void (*ointr)(void *), void *arg);
static void mpu_close(void *);
static int mpu_output(void *, int);
static void mpu_getinfo(void *, struct midi_info *);
static void mpu_get_locks(void *, kmutex_t **, kmutex_t **);
const struct midi_hw_if mpu_midi_hw_if = {
mpu_open,
mpu_close,
mpu_output,
mpu_getinfo,
0, /* ioctl */
mpu_get_locks,
};
int
mpu_find(struct mpu_softc *sc)
{
if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) {
DPRINTF(("%s: No status\n", __func__));
goto bad;
}
sc->open = 0;
sc->intr = 0;
if (mpu_reset(sc) == 0)
return 1;
bad:
return 0;
}
void
mpu_attach(struct mpu_softc *sc)
{
if (sc->lock == NULL) {
panic("mpu_attach: no lock");
}
midi_attach_mi(&mpu_midi_hw_if, sc, sc->sc_dev);
}
static inline int
mpu_waitready(struct mpu_softc *sc)
{
int i;
KASSERT(sc->lock == NULL || mutex_owned(sc->lock));
for (i = 0; i < MPU_MAXWAIT; i++) {
if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY))
return 0;
delay(10);
}
return 1;
}
static int
mpu_reset(struct mpu_softc *sc)
{
bus_space_tag_t iot = sc->iot;
bus_space_handle_t ioh = sc->ioh;
int i;
KASSERT(sc->lock == NULL || mutex_owned(sc->lock));
if (mpu_waitready(sc)) {
DPRINTF(("%s: not ready\n", __func__));
return EIO;
}
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) {
return 0;
}
}
DPRINTF(("%s: No ACK\n", __func__));
return EIO;
}
static int
mpu_open(void *addr, int flags, void (*iintr)(void *, int),
void (*ointr)(void *), void *arg)
{
struct mpu_softc *sc = addr;
DPRINTF(("%s: sc=%p\n", __func__, sc));
KASSERT(mutex_owned(sc->lock));
if (sc->open)
return EBUSY;
#ifndef AUDIO_NO_POWER_CTL
if (sc->powerctl)
sc->powerctl(sc->powerarg, 1);
#endif
if (mpu_reset(sc) != 0) {
#ifndef AUDIO_NO_POWER_CTL
if (sc->powerctl)
sc->powerctl(sc->powerarg, 0);
#endif
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;
}
static void
mpu_close(void *addr)
{
struct mpu_softc *sc = addr;
DPRINTF(("%s: sc=%p\n", __func__, sc));
KASSERT(mutex_owned(sc->lock));
sc->open = 0;
sc->intr = 0;
mpu_reset(sc); /* exit UART mode */
#ifndef AUDIO_NO_POWER_CTL
if (sc->powerctl)
sc->powerctl(sc->powerarg, 0);
#endif
}
static void
mpu_readinput(struct mpu_softc *sc)
{
bus_space_tag_t iot = sc->iot;
bus_space_handle_t ioh = sc->ioh;
int data;
KASSERT(mutex_owned(sc->lock));
while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) {
data = bus_space_read_1(iot, ioh, MPU_DATA);
DPRINTFN(3, ("%s: sc=%p 0x%02x\n", __func__, sc, data));
if (sc->intr)
sc->intr(sc->arg, data);
}
}
static int
mpu_output(void *addr, int d)
{
struct mpu_softc *sc = addr;
KASSERT(mutex_owned(sc->lock));
DPRINTFN(3, ("%s: sc=%p 0x%02x\n", __func__, sc, d));
if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) {
mpu_readinput(sc);
}
if (mpu_waitready(sc)) {
DPRINTF(("%s:: not ready\n", __func__));
return EIO;
}
bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d);
return 0;
}
static void
mpu_getinfo(void *addr, struct midi_info *mi)
{
struct mpu_softc *sc = addr;
KASSERT(mutex_owned(sc->lock));
mi->name = sc->model;
mi->props = 0;
}
static void
mpu_get_locks(void *addr, kmutex_t **intr, kmutex_t **proc)
{
struct mpu_softc *sc = addr;
*intr = sc->lock;
*proc = NULL;
}
int
mpu_intr(void *addr)
{
struct mpu_softc *sc = addr;
KASSERT(mutex_owned(sc->lock));
if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) {
DPRINTF(("%s: no data\n", __func__));
return 0;
} else {
mpu_readinput(sc);
return 1;
}
}
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