/*      $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;
}