/*      $NetBSD: ld_mlx.c,v 1.24 2025/04/13 02:34:03 rin Exp $  */

/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* 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.
*/

/*
* Mylex DAC960 front-end for ld(4) driver.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ld_mlx.c,v 1.24 2025/04/13 02:34:03 rin Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/endian.h>
#include <sys/dkio.h>
#include <sys/disk.h>
#include <sys/module.h>
#include <machine/vmparam.h>
#include <sys/bus.h>

#include <dev/ldvar.h>

#include <dev/ic/mlxreg.h>
#include <dev/ic/mlxio.h>
#include <dev/ic/mlxvar.h>

#include "ioconf.h"

struct ld_mlx_softc {
       struct  ld_softc sc_ld;
       int     sc_hwunit;
};

static void     ld_mlx_attach(device_t, device_t, void *);
static int      ld_mlx_detach(device_t, int);
static int      ld_mlx_dobio(struct ld_mlx_softc *, void *, int, int, int,
                            struct buf *);
static int      ld_mlx_dump(struct ld_softc *, void *, daddr_t, int);
static void     ld_mlx_handler(struct mlx_ccb *);
static int      ld_mlx_match(device_t, cfdata_t, void *);
static int      ld_mlx_start(struct ld_softc *, struct buf *);

CFATTACH_DECL_NEW(ld_mlx, sizeof(struct ld_mlx_softc),
   ld_mlx_match, ld_mlx_attach, ld_mlx_detach, NULL);

static int
ld_mlx_match(device_t parent, cfdata_t match, void *aux)
{

       return (1);
}

static void
ld_mlx_attach(device_t parent, device_t self, void *aux)
{
       struct mlx_attach_args *mlxa = aux;
       struct ld_mlx_softc *sc = device_private(self);
       struct ld_softc *ld = &sc->sc_ld;
       struct mlx_softc *mlx = device_private(parent);
       struct mlx_sysdrive *ms = &mlx->mlx_sysdrive[mlxa->mlxa_unit];
       const char *statestr;

       ld->sc_dv = self;

       sc->sc_hwunit = mlxa->mlxa_unit;
       ld->sc_maxxfer = MLX_MAX_XFER;
       ld->sc_secsize = MLX_SECTOR_SIZE;
       ld->sc_maxqueuecnt = 1;
       ld->sc_start = ld_mlx_start;
       ld->sc_dump = ld_mlx_dump;
       ld->sc_secperunit = ms->ms_size;

       /*
        * Report on current status, and attach to the ld driver proper.
        */
       switch (ms->ms_state) {
       case MLX_SYSD_ONLINE:
               statestr = "online";
               ld->sc_flags = LDF_ENABLED;
               break;

       case MLX_SYSD_CRITICAL:
               statestr = "critical";
               ld->sc_flags = LDF_ENABLED;
               break;

       case MLX_SYSD_OFFLINE:
               statestr = "offline";
               break;

       default:
               statestr = "state unknown";
               break;
       }

       if (ms->ms_raidlevel == MLX_SYS_DRV_JBOD)
               aprint_normal(": JBOD, %s\n", statestr);
       else
               aprint_normal(": RAID%d, %s\n", ms->ms_raidlevel, statestr);

       ldattach(ld, BUFQ_DISK_DEFAULT_STRAT);
}

static int
ld_mlx_detach(device_t dv, int flags)
{
       struct ld_mlx_softc *sc = device_private(dv);
       struct ld_softc *ld = &sc->sc_ld;
       struct mlx_softc *mlx = device_private(device_parent(dv));
       int rv;

       if ((rv = ldbegindetach(ld, flags)) != 0)
               return (rv);
       ldenddetach(ld);
       mlx_flush(mlx, 1);

       return (0);
}

static int
ld_mlx_dobio(struct ld_mlx_softc *sc, void *data, int datasize, int blkno,
            int dowrite, struct buf *bp)
{
       struct mlx_ccb *mc;
       struct mlx_softc *mlx;
       int s, rv;
       bus_addr_t sgphys;

       mlx = device_private(device_parent(sc->sc_ld.sc_dv));

       if ((rv = mlx_ccb_alloc(mlx, &mc, bp == NULL)) != 0)
               return (rv);

       /* Map the data transfer. */
       rv = mlx_ccb_map(mlx, mc, data, datasize,
           dowrite ? MC_XFER_OUT : MC_XFER_IN);
       if (rv != 0) {
               mlx_ccb_free(mlx, mc);
               return (rv);
       }

       /* Build the command. */
       sgphys = mlx->mlx_sgls_paddr + (MLX_SGL_SIZE * mc->mc_ident);
       datasize /= MLX_SECTOR_SIZE;

       if (mlx->mlx_ci.ci_iftype <= 2)
               mlx_make_type1(mc,
                   dowrite ? MLX_CMD_WRITESG_OLD : MLX_CMD_READSG_OLD,
                   datasize & 0xff, blkno, sc->sc_hwunit, sgphys,
                   mc->mc_nsgent);
       else
               mlx_make_type5(mc,
                   dowrite ? MLX_CMD_WRITESG : MLX_CMD_READSG,
                   datasize & 0xff,
                   (sc->sc_hwunit << 3) | ((datasize >> 8) & 0x07),
                   blkno, sgphys, mc->mc_nsgent);

       if (bp == NULL) {
               s = splbio();
               rv = mlx_ccb_poll(mlx, mc, 10000);
               mlx_ccb_unmap(mlx, mc);
               mlx_ccb_free(mlx, mc);
               splx(s);
       } else {
               mc->mc_mx.mx_handler = ld_mlx_handler;
               mc->mc_mx.mx_context = bp;
               mc->mc_mx.mx_dv = sc->sc_ld.sc_dv;
               mlx_ccb_enqueue(mlx, mc);
               rv = 0;
       }

       return (rv);
}

static int
ld_mlx_start(struct ld_softc *ld, struct buf *bp)
{

       return (ld_mlx_dobio((struct ld_mlx_softc *)ld, bp->b_data,
           bp->b_bcount, bp->b_rawblkno, (bp->b_flags & B_READ) == 0, bp));
}

static void
ld_mlx_handler(struct mlx_ccb *mc)
{
       struct buf *bp;
       struct mlx_context *mx;
       struct ld_mlx_softc *sc;
       struct mlx_softc *mlx;

       mx = &mc->mc_mx;
       bp = mx->mx_context;
       sc = device_private(mx->mx_dv);
       mlx = device_private(device_parent(sc->sc_ld.sc_dv));

       if (mc->mc_status != MLX_STATUS_OK) {
               bp->b_error = EIO;
               bp->b_resid = bp->b_bcount;

               if (mc->mc_status == MLX_STATUS_RDWROFFLINE)
                       printf("%s: drive offline\n",
                           device_xname(sc->sc_ld.sc_dv));
               else
                       printf("%s: I/O error - %s\n",
                           device_xname(sc->sc_ld.sc_dv),
                           mlx_ccb_diagnose(mc));
       } else
               bp->b_resid = 0;

       mlx_ccb_unmap(mlx, mc);
       mlx_ccb_free(mlx, mc);
       lddone(&sc->sc_ld, bp);
}

static int
ld_mlx_dump(struct ld_softc *ld, void *data, daddr_t blkno, int blkcnt)
{

       /* ld_mlx_dobio() takes only an 'int' as a disk address */
       if (blkno + blkcnt - 1 > INT_MAX)
               return (EIO);

       return (ld_mlx_dobio((struct ld_mlx_softc *)ld, data,
           blkcnt * ld->sc_secsize, blkno, 1, NULL));
}

MODULE(MODULE_CLASS_DRIVER, ld_mlx, "ld");

#ifdef _MODULE
/*
* XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd"
* XXX it will be defined in the common-code module
*/
#undef  CFDRIVER_DECL
#define CFDRIVER_DECL(name, class, attr)
#include "ioconf.c"
#endif

static int
ld_mlx_modcmd(modcmd_t cmd, void *opaque)
{
#ifdef _MODULE
       /*
        * We ignore the cfdriver_vec[] that ioconf provides, since
        * the cfdrivers are attached already.
        */
       static struct cfdriver * const no_cfdriver_vec[] = { NULL };
#endif
       int error = 0;

#ifdef _MODULE
       switch (cmd) {
       case MODULE_CMD_INIT:
               error = config_init_component(no_cfdriver_vec,
                   cfattach_ioconf_ld_mlx, cfdata_ioconf_ld_mlx);
               break;
       case MODULE_CMD_FINI:
               error = config_fini_component(no_cfdriver_vec,
                   cfattach_ioconf_ld_mlx, cfdata_ioconf_ld_mlx);
               break;
       default:
               error = ENOTTY;
               break;
       }
#endif

       return error;
}

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