/*	$OpenBSD: rbus.c,v 1.8 2004/07/09 19:12:40 brad Exp $ */
/*	$NetBSD: rbus.c,v 1.3 1999/11/06 06:20:53 soren Exp $	*/
/*
 * Copyright (c) 1999
 *     HAYAKAWA Koichi.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by HAYAKAWA Koichi.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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.
 */



#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/extent.h>

#include <machine/bus.h>

#include <dev/cardbus/rbus.h>

/* #define RBUS_DEBUG */

#if defined RBUS_DEBUG
#define STATIC
#define DPRINTF(a) printf a
#define DDELAY(x) delay((x)*1000*1000)
#else
#define STATIC static
#define DPRINTF(a)
#endif



static rbus_tag_t rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent,
				    struct extent *ex, bus_addr_t start,
				    bus_addr_t end, bus_addr_t offset,
				    int flags);


int
rbus_space_alloc(rbt, addr, size, mask, align, flags, addrp, bshp)
     rbus_tag_t rbt;
     bus_addr_t addr;
     bus_size_t size;
     bus_addr_t mask, align;
     int flags;
     bus_addr_t *addrp;
     bus_space_handle_t *bshp;
{
  return rbus_space_alloc_subregion(rbt, rbt->rb_start, rbt->rb_end, addr,
				    size, mask, align, flags, addrp, bshp);
}




int
rbus_space_alloc_subregion(rbt, substart, subend, addr, size, mask, align, flags, addrp, bshp)
     rbus_tag_t rbt;
     bus_addr_t addr;
     bus_addr_t substart;
     bus_addr_t subend;
     bus_size_t size;
     bus_addr_t mask, align;
     int flags;
     bus_addr_t *addrp;
     bus_space_handle_t *bshp;
{
  bus_addr_t decodesize = mask + 1;
  bus_addr_t boundary, search_addr;
  int val;
  u_long result;
  int exflags = EX_FAST | EX_NOWAIT | EX_MALLOCOK;

  DPRINTF(("rbus_space_alloc: addr %lx, size %lx, mask %lx, align %lx\n",
	   (u_long)addr, (u_long)size, (u_long)mask, (u_long)align));

  addr += rbt->rb_offset;

  if (mask == 0) {
    /* FULL Decode */
    decodesize = 0;
  }

  if (rbt->rb_flags == RBUS_SPACE_ASK_PARENT) {
    return rbus_space_alloc(rbt->rb_parent, addr, size, mask, align, flags,
			    addrp, bshp);
  } else if (rbt->rb_flags == RBUS_SPACE_SHARE ||
	     rbt->rb_flags == RBUS_SPACE_DEDICATE) {
    /* rbt has its own sh_extent */

    /* sanity check: the subregion [substart, subend] should be
       smaller than the region included in sh_extent */
    if (substart < rbt->rb_ext->ex_start || subend > rbt->rb_ext->ex_end) {
      DPRINTF(("rbus: out of range\n"));
      return 1;
    }

    if (decodesize == align) {
      if(extent_alloc_subregion(rbt->rb_ext, substart, subend, size, align, 0,
				0, exflags, &result)) {
	return 1;
      }
    } else if (decodesize == 0) {
      /* maybe, the register is overflowed. */
      
      if (extent_alloc_subregion(rbt->rb_ext, addr, addr + size, size,
				 1, 0, 0, exflags, &result)) {
	return 1;
      }
    } else {

      boundary = decodesize > align ? decodesize : align;

      search_addr = (substart & ~(boundary - 1)) + addr;

      if (search_addr < substart) {
	search_addr += boundary;
      }

      val = 1;
      for (; search_addr + size <= subend; search_addr += boundary) {
	val = extent_alloc_subregion(rbt->rb_ext,search_addr, search_addr+size,
				size, align, 0, 0, exflags, &result);
        DPRINTF(("rbus: trying [%lx:%lx] %lx\n",
	    (u_long)search_addr,
	    (u_long)search_addr+size, (u_long)align));
	if (val == 0) {
	  break;
	}
      }
      if (val != 0) {
        /* no space found */
        DPRINTF(("rbus: no space found\n"));
	return 1;
      }
    }

    if(md_space_map(rbt->rb_bt, result, size, flags, bshp)) {
      /* map failed */
      extent_free(rbt->rb_ext, result, size, exflags);
      return 1;
    }

    if (addrp != NULL) {
      *addrp = result + rbt->rb_offset;
    }
    return 0;
  } else {
    /* error!! */
    DPRINTF(("rbus: no rbus type\n"));
    return 1;
  }
}





int
rbus_space_free(rbt, bsh, size, addrp)
     rbus_tag_t rbt;
     bus_space_handle_t bsh;
     bus_size_t size;
     bus_addr_t *addrp;
{
  int exflags = EX_FAST | EX_NOWAIT;
  bus_addr_t addr;
  int status = 1;

  if (rbt->rb_flags == RBUS_SPACE_ASK_PARENT) {
    status = rbus_space_free(rbt->rb_parent, bsh, size, &addr);
  } else if (rbt->rb_flags == RBUS_SPACE_SHARE ||
	     rbt->rb_flags == RBUS_SPACE_DEDICATE) {
    md_space_unmap(rbt->rb_bt, bsh, size, &addr);

    extent_free(rbt->rb_ext, addr, size, exflags);

    status = 0;
  } else {
    /* error. INVALID rbustag */
    status = 1;
  }
  if (addrp != NULL) {
    *addrp = addr;
  }
  return status;
}



/*
 * static rbus_tag_t
 * rbus_new_body(bus_space_tag_t bt, rbus_tag_t parent,
 *               struct extent *ex, bus_addr_t start, bus_size_t end,
 *               bus_addr_t offset, int flags)
 *
 */
static rbus_tag_t
rbus_new_body(bt, parent, ex, start, end, offset, flags)
     bus_space_tag_t bt;
     rbus_tag_t parent;
     struct extent *ex;
     bus_addr_t start, end, offset;
     int flags;
{
  rbus_tag_t rb;

  /* sanity check */
  if (parent != NULL) {
    if (start < parent->rb_start || end > parent->rb_end) {
      /* out of range: [start, size] should be contained in parent space */
      return 0;
      /* Should I invoke panic? */
    }
  }

  if (NULL == (rb = (rbus_tag_t)malloc(sizeof(struct rbustag), M_DEVBUF,
					 M_NOWAIT))) {
    panic("no memory for rbus instance");
  }
  
  rb->rb_bt = bt;
  rb->rb_parent = parent;
  rb->rb_start = start;
  rb->rb_end = end;
  rb->rb_offset = offset;
  rb->rb_flags = flags;
  rb->rb_ext = ex;

  DPRINTF(("rbus_new_body: [%lx, %lx] type %s name [%s]\n",
	   (u_long)start, (u_long)end,
	   flags == RBUS_SPACE_SHARE ? "share" :
	   flags == RBUS_SPACE_DEDICATE ? "dedicated" :
	   flags == RBUS_SPACE_ASK_PARENT ? "parent" : "invalid",
	   ex != NULL ? ex->ex_name : "noname"));

  return rb;
}



/*
 * rbus_tag_t rbus_new(rbus_tag_t parent, bus_addr_t start, bus_size_t
 *                     size, bus_addr_t offset, int flags)
 *
 *  This function makes a new child rbus instance.
 */
rbus_tag_t
rbus_new(parent, start, size, offset, flags)
     rbus_tag_t parent;
     bus_addr_t start;
     bus_size_t size;
     bus_addr_t offset;
     int flags;
{
  rbus_tag_t rb;
  struct extent *ex = NULL;
  bus_addr_t end = start + size;

  if (flags == RBUS_SPACE_SHARE) {
    ex = parent->rb_ext;
  } else if (flags == RBUS_SPACE_DEDICATE) {
    if (NULL == (ex = extent_create("rbus", start, end, M_DEVBUF, NULL, 0, 
				    EX_NOCOALESCE|EX_NOWAIT))) {
      return NULL;
    }
  } else if (flags == RBUS_SPACE_ASK_PARENT) {
    ex = NULL;
  } else {
    /* Invalid flag */
    return 0;
  }

  rb = rbus_new_body(parent->rb_bt, parent, ex, start, start + size,
		     offset, flags);

  if ((rb == NULL) && (flags == RBUS_SPACE_DEDICATE)) {
    extent_destroy(ex);
  }

  return rb;
}




/*
 * rbus_tag_t rbus_new_root_delegate(bus_space_tag, bus_addr_t,
 *                                   bus_size_t, bus_addr_t offset)
 *
 *  This function makes a root rbus instance.
 */
rbus_tag_t
rbus_new_root_delegate(bt, start, size, offset)
     bus_space_tag_t bt;
     bus_addr_t start;
     bus_size_t size;
     bus_addr_t offset;
{
  rbus_tag_t rb;
  struct extent *ex;

  if (NULL == (ex = extent_create("rbus root", start, start + size, M_DEVBUF,
				  NULL, 0, EX_NOCOALESCE|EX_NOWAIT))) {
    return NULL;
  }
  
  rb = rbus_new_body(bt, NULL, ex, start, start + size, offset,
		     RBUS_SPACE_DEDICATE);

  if (rb == NULL) {
    extent_destroy(ex);
  }

  return rb;
}



/*
 * rbus_tag_t rbus_new_root_share(bus_space_tag, struct extent *,
 *                                 bus_addr_t, bus_size_t, bus_addr_t offset)
 *
 *  This function makes a root rbus instance.
 */
rbus_tag_t
rbus_new_root_share(bt, ex, start, size, offset)
     bus_space_tag_t bt;
     struct extent *ex;
     bus_addr_t start;
     bus_size_t size;
     bus_addr_t offset;
{
  /* sanity check */
  if (start < ex->ex_start || start + size > ex->ex_end) {
    /* out of range: [start, size] should be contained in parent space */
    return 0;
    /* Should I invoke panic? */
  }

  return rbus_new_body(bt, NULL, ex, start, start + size, offset,
		       RBUS_SPACE_SHARE);
}





/*
 * int rbus_delete (rbus_tag_t rb)
 *
 *   This function deletes the rbus structure pointed in the argument.
 */
int
rbus_delete(rb)
     rbus_tag_t rb;
{
  DPRINTF(("rbus_delete called [%s]\n",
	   rb->rb_ext != NULL ? rb->rb_ext->ex_name : "noname"));
  if (rb->rb_flags == RBUS_SPACE_DEDICATE) {
    extent_destroy(rb->rb_ext);
  }

  free(rb, M_DEVBUF);

  return 0;
}