NetBSD-5.0.2/sys/dev/cardbus/rbus.c
/* $NetBSD: rbus.c,v 1.25 2007/10/19 11:59:39 ad 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.
* 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rbus.c,v 1.25 2007/10/19 11:59:39 ad 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(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, 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(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 (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(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;
}