/* $NetBSD: xp.c,v 1.8 2023/01/15 05:08:33 tsutsui Exp $ */

/*-
* Copyright (c) 2016 Izumi Tsutsui.  All rights reserved.
*
* 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 AUTHOR ``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 AUTHOR 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.
*/

/*
* LUNA's Hitachi HD647180 "XP" I/O processor driver
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: xp.c,v 1.8 2023/01/15 05:08:33 tsutsui Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/kmem.h>
#include <sys/mman.h>
#include <sys/errno.h>

#include <uvm/uvm_extern.h>

#include <machine/autoconf.h>
#include <machine/board.h>
#include <machine/xpio.h>

#include <luna68k/dev/xpbusvar.h>

#include "ioconf.h"
#include "xplx/xplxdefs.h"

struct xp_softc {
       device_t        sc_dev;

       vaddr_t         sc_shm_base;
       vsize_t         sc_shm_size;
       vaddr_t         sc_tas;

       bool            sc_isopen;
       int             sc_flags;
};

static int xp_match(device_t, cfdata_t, void *);
static void xp_attach(device_t, device_t, void *);

static dev_type_open(xp_open);
static dev_type_close(xp_close);
static dev_type_read(xp_read);
static dev_type_write(xp_write);
static dev_type_ioctl(xp_ioctl);
static dev_type_mmap(xp_mmap);

const struct cdevsw xp_cdevsw = {
       .d_open     = xp_open,
       .d_close    = xp_close,
       .d_read     = xp_read,
       .d_write    = xp_write,
       .d_ioctl    = xp_ioctl,
       .d_stop     = nostop,
       .d_tty      = notty,
       .d_poll     = nopoll,
       .d_mmap     = xp_mmap,
       .d_kqfilter = nokqfilter,
       .d_discard  = nodiscard,
       .d_flag     = 0
};

CFATTACH_DECL_NEW(xp, sizeof(struct xp_softc),
   xp_match, xp_attach, NULL, NULL);

/* #define XP_DEBUG */

#ifdef XP_DEBUG
#define XP_DEBUG_ALL    0xff
uint32_t xp_debug = 0;
#define DPRINTF(x, y)   if (xp_debug & (x)) printf y
#else
#define DPRINTF(x, y)   /* nothing */
#endif

static bool xp_matched;

static int
xp_match(device_t parent, cfdata_t cf, void *aux)
{
       struct xpbus_attach_args *xa = aux;

       /* only one XP processor */
       if (xp_matched)
               return 0;

       if (strcmp(xa->xa_name, xp_cd.cd_name))
               return 0;

       xp_matched = true;
       return 1;
}

static void
xp_attach(device_t parent, device_t self, void *aux)
{
       struct xp_softc *sc = device_private(self);

       sc->sc_dev = self;

       aprint_normal(": HD647180X I/O processor\n");

       sc->sc_shm_base = XP_SHM_BASE;
       sc->sc_shm_size = XP_SHM_SIZE;
       sc->sc_tas      = XP_TAS_ADDR;
}

static int
xp_open(dev_t dev, int flags, int devtype, struct lwp *l)
{
       struct xp_softc *sc;
       int unit;
       u_int a;

       DPRINTF(XP_DEBUG_ALL, ("%s\n", __func__));

       unit = minor(dev);
       sc = device_lookup_private(&xp_cd, unit);
       if (sc == NULL)
               return ENXIO;
       if (sc->sc_isopen)
               return EBUSY;

       if ((flags & FWRITE) != 0) {
               /* exclusive if write */
               a = xp_acquire(DEVID_XPBUS, XP_ACQ_EXCL);
               if (a == 0)
                       return EBUSY;
               if (a != (1 << DEVID_XPBUS)) {
                       xp_release(DEVID_XPBUS);
                       return EBUSY;
               }
       } else {
               a = xp_acquire(DEVID_XPBUS, 0);
               if (a == 0)
                       return EBUSY;
       }

       sc->sc_isopen = true;
       sc->sc_flags = flags;

       return 0;
}

static int
xp_close(dev_t dev, int flags, int mode, struct lwp *l)
{
       struct xp_softc *sc;
       int unit;

       DPRINTF(XP_DEBUG_ALL, ("%s\n", __func__));

       unit = minor(dev);
       sc = device_lookup_private(&xp_cd, unit);

       xp_release(DEVID_XPBUS);

       sc->sc_isopen = false;

       return 0;
}

static int
xp_ioctl(dev_t dev, u_long cmd, void *addr, int flags, struct lwp *l)
{
       struct xp_softc *sc;
       int unit, error;
       struct xp_download *downld;
       uint8_t *loadbuf;
       size_t loadsize;

       DPRINTF(XP_DEBUG_ALL, ("%s\n", __func__));

       unit = minor(dev);
       sc = device_lookup_private(&xp_cd, unit);

       switch (cmd) {
       case XPIOCDOWNLD:
               if ((sc->sc_flags & FWRITE) == 0) {
                       return EACCES;
               }
               downld = addr;
               loadsize = downld->size;
               if (loadsize == 0 || loadsize > sc->sc_shm_size) {
                       return EINVAL;
               }

               loadbuf = kmem_alloc(loadsize, KM_SLEEP);
               error = copyin(downld->data, loadbuf, loadsize);
               if (error == 0) {
                       xp_set_shm_dirty();
                       xp_cpu_reset_hold();
                       delay(100);
                       memcpy((void *)sc->sc_shm_base, loadbuf, loadsize);
                       delay(100);
                       xp_cpu_reset_release();
               } else {
                       DPRINTF(XP_DEBUG_ALL, ("%s: ioctl failed (err =  %d)\n",
                           __func__, error));
               }

               kmem_free(loadbuf, loadsize);
               return error;

       default:
               return ENOTTY;
       }

       panic("%s: cmd (%ld) is not handled", device_xname(sc->sc_dev), cmd);
}

static paddr_t
xp_mmap(dev_t dev, off_t offset, int prot)
{
       struct xp_softc *sc;
       int unit;
       paddr_t pa;

       pa = -1;

       unit = minor(dev);
       sc = device_lookup_private(&xp_cd, unit);

       if (offset >= 0 &&
           offset < sc->sc_shm_size) {
               pa = m68k_btop(m68k_trunc_page(sc->sc_shm_base) + offset);
       }

       if ((prot & PROT_WRITE) != 0)
               xp_set_shm_dirty();

       return pa;
}

static int
xp_read(dev_t dev, struct uio *uio, int flags)
{

       return ENODEV;
}

static int
xp_write(dev_t dev, struct uio *uio, int flags)
{

       return ENODEV;
}

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