/*      $NetBSD: bmd.c,v 1.28 2024/01/07 07:58:33 isaki Exp $   */

/*
* Copyright (c) 2002 Tetsuya Isaki. 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.
*/

/*
* Nereid bank memory disk
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bmd.c,v 1.28 2024/01/07 07:58:33 isaki Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/proc.h>

#include <machine/bus.h>
#include <machine/cpu.h>

#include <arch/x68k/dev/intiovar.h>

#include "ioconf.h"

#define BMD_ADDR1       (0xece3f0)
#define BMD_ADDR2       (0xecebf0)

#define BMD_PAGESIZE    (0x10000)       /* 64KB */
#define BMD_BSIZE       (512)
#define BLKS_PER_PAGE   (BMD_PAGESIZE / BMD_BSIZE)

#define BMD_PAGE        (0)
#define BMD_CTRL        (1)
#define BMD_CTRL_ENABLE (0x80)  /* DIP8: 1=Enable, 0=Disable */
#define BMD_CTRL_MEMORY (0x40)  /*       1=16M available, 0=4M available */
#define BMD_CTRL_WINDOW (0x20)  /* DIP6: 1=0xee0000, 0=0xef0000 */


#define BMD_UNIT(dev)   (minor(dev) / 8)

#ifdef BMD_DEBUG
#define DPRINTF(x)      printf x
#else
#define DPRINTF(x)      /* nothing */
#endif

struct bmd_softc {
       struct disk sc_dkdev;
       bus_space_tag_t    sc_iot;
       bus_space_handle_t sc_ioh;
       bus_space_handle_t sc_bank;

       int sc_maxpage;
       int sc_window;

       int sc_flags;
#define BMD_OPENBLK     (0x01)
#define BMD_OPENCHR     (0x02)
#define BMD_OPEN        (BMD_OPENBLK | BMD_OPENCHR)
};

static int  bmd_match(device_t, cfdata_t, void *);
static void bmd_attach(device_t, device_t, void *);
static int  bmd_getdisklabel(struct bmd_softc *, dev_t);

CFATTACH_DECL_NEW(bmd, sizeof(struct bmd_softc),
       bmd_match, bmd_attach, NULL, NULL);

dev_type_open(bmdopen);
dev_type_close(bmdclose);
dev_type_read(bmdread);
dev_type_write(bmdwrite);
dev_type_ioctl(bmdioctl);
dev_type_strategy(bmdstrategy);
dev_type_dump(bmddump);
dev_type_size(bmdsize);

const struct bdevsw bmd_bdevsw = {
       .d_open = bmdopen,
       .d_close = bmdclose,
       .d_strategy = bmdstrategy,
       .d_ioctl = bmdioctl,
       .d_dump = bmddump,
       .d_psize = bmdsize,
       .d_discard = nodiscard,
       .d_flag = D_DISK
};

const struct cdevsw bmd_cdevsw = {
       .d_open = bmdopen,
       .d_close = bmdclose,
       .d_read = bmdread,
       .d_write = bmdwrite,
       .d_ioctl = bmdioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = nopoll,
       .d_mmap = nommap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = D_DISK
};

struct dkdriver bmddkdriver = {
       .d_strategy = bmdstrategy
};

static int
bmd_match(device_t parent, cfdata_t cf, void *aux)
{
       struct intio_attach_args *ia = aux;
       bus_space_tag_t iot = ia->ia_bst;
       bus_space_handle_t ioh;
       int window;
       int r;

       if (ia->ia_addr == INTIOCF_ADDR_DEFAULT)
               ia->ia_addr = BMD_ADDR1;

       /* fixed parameter */
       if (ia->ia_addr != BMD_ADDR1 && ia->ia_addr != BMD_ADDR2)
               return (0);

       /* Check CTRL addr */
       if (badaddr((void *)IIOV(ia->ia_addr)))
               return (0);

       ia->ia_size = 2;
       if (bus_space_map(iot, ia->ia_addr, ia->ia_size, 0, &ioh))
               return (0);

       /* Check window addr */
       r = bus_space_read_1(iot, ioh, BMD_CTRL);
       bus_space_unmap(iot, ioh, ia->ia_size);

       if ((r & BMD_CTRL_WINDOW))
               window = 0xef0000;
       else
               window = 0xee0000;
       if (badaddr((void *)IIOV(window)))
               return (0);

       return (1);
}

static void
bmd_attach(device_t parent, device_t self, void *aux)
{
       struct bmd_softc *sc = device_private(self);
       struct intio_attach_args *ia = aux;
       bus_space_tag_t iot = ia->ia_bst;
       bus_space_handle_t ioh;
       u_int8_t r;

       aprint_normal(": Nereid Bank Memory Disk\n");

       /* Map I/O space */
       ia->ia_size = 2;
       if (bus_space_map(iot, ia->ia_addr, ia->ia_size, 0, &ioh)) {
               aprint_error_dev(self, "can't map I/O space\n");
               return;
       }

       sc->sc_iot = iot;
       sc->sc_ioh = ioh;

       /* read control register */
       r = bus_space_read_1(sc->sc_iot, sc->sc_ioh, BMD_CTRL);

       /* check enable-bit */
       if ((r & BMD_CTRL_ENABLE) == 0) {
               aprint_error_dev(self, "disabled by DIP-SW 8\n");
               return;
       }

       if ((r & BMD_CTRL_MEMORY))
               sc->sc_maxpage = 256;
       else
               sc->sc_maxpage = 64;

       if ((r & BMD_CTRL_WINDOW))
               sc->sc_window = 0xef0000;
       else
               sc->sc_window = 0xee0000;

       /* Map bank area */
       if (bus_space_map(iot, sc->sc_window, BMD_PAGESIZE, 0, &sc->sc_bank)) {
               aprint_error_dev(self, "can't map bank area: 0x%x\n",
                       sc->sc_window);
               return;
       }

       aprint_normal_dev(self, "%d MB, 0x%x(64KB) x %d pages\n",
               (sc->sc_maxpage / 16), sc->sc_window, sc->sc_maxpage);

       disk_init(&sc->sc_dkdev, device_xname(self), &bmddkdriver);
       disk_attach(&sc->sc_dkdev);
}

int
bmdopen(dev_t dev, int oflags, int devtype, struct lwp *l)
{
       struct bmd_softc *sc;

       DPRINTF(("%s%d\n", __func__, BMD_UNIT(dev)));

       sc = device_lookup_private(&bmd_cd, BMD_UNIT(dev));
       if (sc == NULL)
               return ENXIO;

       switch (devtype) {
       case S_IFCHR:
               sc->sc_flags |= BMD_OPENCHR;
               break;
       case S_IFBLK:
               sc->sc_flags |= BMD_OPENBLK;
               break;
       }

       bmd_getdisklabel(sc, dev);

       return (0);
}

int
bmdclose(dev_t dev, int fflag, int devtype, struct lwp *l)
{
       struct bmd_softc *sc = device_lookup_private(&bmd_cd, BMD_UNIT(dev));

       DPRINTF(("%s%d\n", __func__, BMD_UNIT(dev)));

       switch (devtype) {
       case S_IFCHR:
               sc->sc_flags &= ~BMD_OPENCHR;
               break;
       case S_IFBLK:
               sc->sc_flags &= ~BMD_OPENBLK;
               break;
       }

       return (0);
}

void
bmdstrategy(struct buf *bp)
{
       int unit = BMD_UNIT(bp->b_dev);
       struct bmd_softc *sc;
       int offset, disksize, resid;
       int page, pg_offset, pg_resid;
       void *data;

       if (unit >= bmd_cd.cd_ndevs) {
               bp->b_error = ENXIO;
               goto done;
       }

       sc = device_lookup_private(&bmd_cd, BMD_UNIT(bp->b_dev));
       if (sc == NULL) {
               bp->b_error = ENXIO;
               goto done;
       }

       DPRINTF(("bmdstrategy: %s blkno %" PRIx64 " bcount %d:",
               (bp->b_flags & B_READ) ? "read " : "write",
               bp->b_blkno, bp->b_bcount));

       bp->b_resid = bp->b_bcount;
       offset = (bp->b_blkno << DEV_BSHIFT);
       disksize = sc->sc_maxpage * BMD_PAGESIZE;
       if (offset >= disksize) {
               /* EOF if read, EIO if write */
               if (bp->b_flags & B_READ)
                       goto done;
               bp->b_error = EIO;
               goto done;
       }

       resid = bp->b_resid;
       if (resid > disksize - offset)
               resid = disksize - offset;

       data = bp->b_data;
       do {
               page = offset / BMD_PAGESIZE;
               pg_offset = offset % BMD_PAGESIZE;

               /* length */
               pg_resid = MIN(resid, BMD_PAGESIZE - pg_offset);

               /* switch bank page */
               bus_space_write_1(sc->sc_iot, sc->sc_ioh, BMD_PAGE, page);

               /* XXX we should use DMA transfer? */
               if ((bp->b_flags & B_READ)) {
                       bus_space_read_region_1(sc->sc_iot, sc->sc_bank,
                               pg_offset, data, pg_resid);
               } else {
                       bus_space_write_region_1(sc->sc_iot, sc->sc_bank,
                               pg_offset, data, pg_resid);
               }

               data = (char *)data + pg_resid;
               offset += pg_resid;
               resid -= pg_resid;
               bp->b_resid -= pg_resid;
       } while (resid > 0);

       DPRINTF(("\n"));

done:
       biodone(bp);
}

int
bmdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
       struct bmd_softc *sc;
       struct disklabel dl;
       int error;

       DPRINTF(("%s%d %ld\n", __func__, BMD_UNIT(dev), cmd));

       sc = device_lookup_private(&bmd_cd, BMD_UNIT(dev));

       if (sc == NULL)
               return ENXIO;

       error = disk_ioctl(&sc->sc_dkdev, dev, cmd, data, flag, l);
       if (error != EPASSTHROUGH)
               return error;

       switch (cmd) {
       case DIOCWDINFO:
               if ((flag & FWRITE) == 0)
                       return EBADF;

               error = setdisklabel(&dl, (struct disklabel *)data, 0, NULL);
               if (error)
                       return error;
               error = writedisklabel(dev, bmdstrategy, &dl, NULL);
               return error;

       default:
               return EINVAL;
       }
       return 0;
}

int
bmddump(dev_t dev, daddr_t blkno, void *va, size_t size)
{

       DPRINTF(("%s%d ", __func__, BMD_UNIT(dev)));
       return ENODEV;
}

int
bmdsize(dev_t dev)
{
       struct bmd_softc *sc;

       DPRINTF(("%s%d ", __func__, BMD_UNIT(dev)));

       sc = device_lookup_private(&bmd_cd, BMD_UNIT(dev));
       if (sc == NULL)
               return 0;

       return (sc->sc_maxpage * BMD_PAGESIZE) >> DEV_BSHIFT;
}

int
bmdread(dev_t dev, struct uio *uio, int ioflag)
{
       return physio(bmdstrategy, NULL, dev, B_READ, minphys, uio);
}

int
bmdwrite(dev_t dev, struct uio *uio, int ioflag)
{
       return physio(bmdstrategy, NULL, dev, B_WRITE, minphys, uio);
}

static int
bmd_getdisklabel(struct bmd_softc *sc, dev_t dev)
{
       struct disklabel *lp;
       int part;

       part = DISKPART(dev);
       lp = sc->sc_dkdev.dk_label;
       memset(lp, 0, sizeof(struct disklabel));

       lp->d_secsize     = BMD_BSIZE;
       lp->d_nsectors    = BLKS_PER_PAGE;
       lp->d_ntracks     = sc->sc_maxpage;
       lp->d_ncylinders  = 1;
       lp->d_secpercyl   = lp->d_nsectors * lp->d_ntracks;
       lp->d_secperunit  = lp->d_secpercyl * lp->d_ncylinders;

       lp->d_type        = DKTYPE_LD;
       lp->d_rpm         = 300;        /* dummy */
       lp->d_interleave  = 1;  /* dummy? */

       lp->d_npartitions = part + 1;
       lp->d_bbsize = 8192;
       lp->d_sbsize = 8192;    /* ? */

       lp->d_magic       = DISKMAGIC;
       lp->d_magic2      = DISKMAGIC;
       lp->d_checksum    = dkcksum(lp);

       lp->d_partitions[part].p_size   = lp->d_secperunit;
       lp->d_partitions[part].p_fstype = FS_BSDFFS;
       lp->d_partitions[part].p_fsize  = 1024;
       lp->d_partitions[part].p_frag   = 8;

       return (0);
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.