/*      $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 ([email protected]) 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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