/*      $NetBSD: dev_disk.c,v 1.5 2011/07/17 20:54:48 joerg Exp $ */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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.
*/

/*
* This module implements a "raw device" interface suitable for
* use by the stand-alone I/O library UFS file-system code, and
* possibly for direct access (i.e. boot from tape).
*
* The implementation is deceptively simple because it uses the
* drivers provided by the Sun PROM monitor.  Note that only the
* PROM driver used to load the boot program is available here.
*/

#include <sys/types.h>
#include <machine/mon.h>
#include <stand.h>

#include "libsa.h"
#include "dvma.h"
#include "saio.h"
#include "dev_disk.h"

#define RETRY_COUNT 5

int disk_opencount;
struct saioreq disk_ioreq;

int
disk_open(struct open_file *f, ...)
{
       struct bootparam *bp;
       struct saioreq *si;
       int error;

#ifdef DEBUG_PROM
       char *devname;          /* Device part of file name (or NULL). */
       va_list ap;

       va_start(ap, f);
       devname = va_arg(ap, char *);
       if (debug)
               printf("disk_open: %s\n", devname);
       va_end(ap);
#endif

       si = &disk_ioreq;
       if (disk_opencount == 0) {
               /*
                * Setup our part of the saioreq.
                * (determines what gets opened)
                */
               bp = *romVectorPtr->bootParam;
               si->si_boottab = bp->bootDevice;
               si->si_ctlr = bp->ctlrNum;
               si->si_unit = bp->unitNum;
               si->si_boff = bp->partNum;
               if ((error = prom_iopen(si)) != 0)
                       return (error);
       }
       disk_opencount++;

       f->f_devdata = si;
       return 0;
}

int
disk_close(struct open_file *f)
{
       struct saioreq *si;

#ifdef DEBUG_PROM
       if (debug)
               printf("disk_close: ocnt=%d\n", disk_opencount);
#endif

       si = f->f_devdata;
       f->f_devdata = NULL;
       if (disk_opencount <= 0)
               return 0;
       if (--disk_opencount == 0)
               prom_iclose(si);
       return 0;
}

int
disk_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf,
   size_t *rsize)
{
       struct saioreq *si;
       struct boottab *ops;
       char *dmabuf;
       int retry, si_flag, xcnt;

       si = devdata;
       ops = si->si_boottab;

#ifdef DEBUG_PROM
       if (debug > 1)
               printf("disk_strategy: size=%d dblk=%d\n", size, dblk);
#endif

       dmabuf = dvma_mapin(buf, size);
       si_flag = (flag == F_READ) ? SAIO_F_READ : SAIO_F_WRITE;

       /*
        * The PROM strategy will occasionally return -1 and expect
        * us to try again.  From [email protected]
        */
       retry = RETRY_COUNT;
       do {
               si->si_bn = dblk;
               si->si_ma = dmabuf;
               si->si_cc = size;
               xcnt = (*ops->b_strategy)(si, si_flag);
       } while ((xcnt <= 0) && (--retry > 0));

       dvma_mapout(dmabuf, size);

#ifdef DEBUG_PROM
       if (debug > 1)
               printf("disk_strategy: xcnt = %x retries=%d\n",
                  xcnt, RETRY_COUNT - retry);
#endif

       if (xcnt <= 0)
               return (EIO);

       *rsize = xcnt;
       return (0);
}

int
disk_ioctl(struct open_file *f, u_long cmd, void *data)
{
       return EIO;
}