/*      $NetBSD: z3rambd.c,v 1.6 2023/12/20 00:40:42 thorpej Exp $ */

/*-
* Copyright (c) 2012 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Radoslaw Kujawa.
*
* 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: z3rambd.c,v 1.6 2023/12/20 00:40:42 thorpej Exp $");

/*
* Z3 RAM virtual block device. Supports ZorRAM, BigRamPlus and FastLane Z3 so
* far.
*/

#include <sys/param.h>
#include <sys/device.h>
#include <sys/socket.h>
#include <sys/systm.h>

#include <machine/cpu.h>

#include <amiga/dev/zbusvar.h>
#include <amiga/dev/z3rambdvar.h>

#include <dev/altmem/altmemvar.h>

static int      z3rambd_match(device_t, cfdata_t , void *);
static void     z3rambd_attach(device_t, device_t, void *);

static int      z3rambd_altmem_print(void *, const char *);

static void     z3rambd_altmem_strategy(void *, struct buf *);
static size_t   z3rambd_altmem_getsize(void *);

static const struct altmem_memops z3rambd_altmem_memops = {
       .getsize = z3rambd_altmem_getsize,
       .strategy = z3rambd_altmem_strategy
};

CFATTACH_DECL_NEW(z3rambd, sizeof(struct z3rambd_softc),
   z3rambd_match, z3rambd_attach, NULL, NULL);

int
z3rambd_match(device_t parent, cfdata_t cf, void *aux)
{
       struct zbus_args *zap;
       zap = aux;

       if (z3rambd_match_id(zap->manid, zap->prodid) > 0)
               return 100;

       return 0;
}

void
z3rambd_attach(device_t parent, device_t self, void *aux)
{
       struct z3rambd_softc *sc;
       struct zbus_args *zap;
       struct altmem_attach_args aaa;

       sc = device_private(self);
       sc->sc_dev = self;
       zap = aux;

       sc->sc_bst.base = (bus_addr_t)zap->va;
       sc->sc_bst.absm = &amiga_bus_stride_1;
       sc->sc_iot = &sc->sc_bst;

       /* XXX: duh, size of the board does not necessarily equal mem size */
       sc->sc_size = zap->size;

       if (zap->prodid == ZORRO_PRODID_ZORRAM)
               aprint_normal(": AmigaKit ZorRAM / Individual Computers BigRamPlus\n");
       else if (zap->prodid == ZORRO_PRODID_3128)
               aprint_normal(": DKB 3128\n");
       else if (zap->prodid == ZORRO_PRODID_FLZ3MEM)
               aprint_normal(": FastLane Z3 memory\n");
       else
               aprint_normal("\n");

       if (bus_space_map(sc->sc_iot, 0, sc->sc_size, 0,
           &sc->sc_ioh)) {
               aprint_error_dev(sc->sc_dev, "can't map the RAM\n");
       }

       sc->sc_va = bus_space_vaddr(sc->sc_iot, sc->sc_ioh);

       aaa.cookie = sc;
       aaa.memops = &z3rambd_altmem_memops;
       config_found(self, &aaa, z3rambd_altmem_print, CFARGS_NONE);
}

static int
z3rambd_altmem_print(void *aux, const char *pnp)
{
       if (pnp)
               aprint_normal("altmem at %s", pnp);

       return UNCONF;
}

/* XXX: should be rewritten using bus_space_read_region? */
static void
z3rambd_altmem_strategy(void *aux, struct buf *bp)
{
       struct z3rambd_softc *sc = aux;
       void *addr;
       size_t off;
       int s;

       bp->b_resid = bp->b_bcount;
       off = bp->b_blkno << DEV_BSHIFT;

       s = splbio();

       addr = (char *)((char*)sc->sc_va + off);
#ifdef Z3RAMBD_DEBUG
       aprint_normal_dev(sc->sc_dev,"stratetgy at %x %x\n", (bus_addr_t) addr,
           (bus_addr_t) kvtop(addr));
#endif /* Z3RAMBD_DEBUG */

       if (bp->b_flags & B_READ)
               memcpy((char *)bp->b_data, addr, bp->b_resid);
       else
               memcpy(addr, (char *)bp->b_data, bp->b_resid);

       splx(s);
}

static size_t
z3rambd_altmem_getsize(void *aux)
{
       struct z3rambd_softc *sc = aux;
       return sc->sc_size;
}