/*      $NetBSD: rbus.c,v 1.29 2012/01/27 18:53:07 para Exp $   */

/*
* Copyright (c) 1999 and 2000
*     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.
*
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rbus.c,v 1.29 2012/01/27 18:53:07 para Exp $");

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

#include <sys/bus.h>

#include <dev/cardbus/rbus.h>

/* #define RBUS_DEBUG */

#if defined RBUS_DEBUG
#define STATIC
#define DPRINTF(a) printf a
#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(rbus_tag_t rbt, bus_addr_t addr, bus_size_t size, bus_addr_t mask, bus_addr_t 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(rbus_tag_t rbt, bus_addr_t substart, bus_addr_t subend, bus_addr_t addr, bus_size_t size, bus_addr_t mask, bus_addr_t 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, 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, 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, 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(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 (status == 0 && 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(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)
{
       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(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,
                   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(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,
           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(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(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;
}

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