/* $NetBSD: fdt_openfirm.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $ */
/*-
* Copyright (c) 2015 Jared D. McNeill <
[email protected]>
* 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: fdt_openfirm.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $");
#include <sys/param.h>
#include <libfdt.h>
#include <dev/fdt/fdtvar.h>
int
OF_peer(int phandle)
{
const void *fdt_data = fdtbus_get_data();
int off, depth;
if (fdt_data == NULL) {
return -1;
}
if (phandle == 0) {
return fdtbus_offset2phandle(0);
}
off = fdtbus_phandle2offset(phandle);
if (off < 0) {
return 0;
}
depth = 1;
for (off = fdt_next_node(fdt_data, off, &depth);
off >= 0 && depth >= 0;
off = fdt_next_node(fdt_data, off, &depth)) {
if (depth == 1) {
return fdtbus_offset2phandle(off);
}
}
return 0;
}
int
OF_child(int phandle)
{
const void *fdt_data = fdtbus_get_data();
int off, depth;
if (fdt_data == NULL) {
return -1;
}
off = fdtbus_phandle2offset(phandle);
if (off < 0) {
return 0;
}
depth = 0;
for (off = fdt_next_node(fdt_data, off, &depth);
off >= 0 && depth > 0;
off = fdt_next_node(fdt_data, off, &depth)) {
if (depth == 1) {
return fdtbus_offset2phandle(off);
}
}
return 0;
}
int
OF_parent(int phandle)
{
const void *fdt_data = fdtbus_get_data();
int off;
if (fdt_data == NULL) {
return -1;
}
off = fdtbus_phandle2offset(phandle);
if (off < 0) {
return -1;
}
off = fdt_parent_offset(fdt_data, off);
if (off < 0) {
return -1;
}
return fdtbus_offset2phandle(off);
}
int
OF_nextprop(int phandle, const char *prop, void *nextprop)
{
const void *fdt_data = fdtbus_get_data();
const char *name;
const void *val;
int off, len;
if (fdt_data == NULL) {
return -1;
}
off = fdtbus_phandle2offset(phandle);
if (off < 0) {
return -1;
}
if (*prop == '\0') {
name = "name";
} else {
off = fdt_first_property_offset(fdt_data, off);
if (off < 0) {
return 0;
}
if (strcmp(prop, "name") != 0) {
while (off >= 0) {
val = fdt_getprop_by_offset(fdt_data, off,
&name, &len);
if (val == NULL) {
return -1;
}
off = fdt_next_property_offset(fdt_data, off);
if (off < 0) {
return 0;
}
if (strcmp(name, prop) == 0)
break;
}
}
val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
if (val == NULL) {
return -1;
}
}
strlcpy(nextprop, name, 33);
return 1;
}
int
OF_getprop(int phandle, const char *prop, void *buf, int buflen)
{
const void *fdt_data = fdtbus_get_data();
const char *name;
const void *val;
int off, len;
if (fdt_data == NULL) {
return -1;
}
off = fdtbus_phandle2offset(phandle);
if (off < 0) {
return -1;
}
if (strcmp(prop, "name") == 0) {
val = fdt_get_name(fdt_data, off, &len);
if (val) {
const char *p = strchr(val, '@');
if (p) {
len = (uintptr_t)p - (uintptr_t)val + 1;
} else {
len += 1;
}
}
if (val == NULL || len > buflen) {
return -1;
}
char *s = buf;
memcpy(buf, val, len - 1);
s[len - 1] = '\0';
} else {
off = fdt_first_property_offset(fdt_data, off);
if (off < 0) {
return -1;
}
while (off >= 0) {
val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
if (val == NULL) {
return -1;
}
if (strcmp(name, prop) == 0) {
break;
}
off = fdt_next_property_offset(fdt_data, off);
if (off < 0) {
return -1;
}
}
if (val == NULL || len > buflen) {
return -1;
}
memcpy(buf, val, len);
}
return len;
}
int
OF_getproplen(int phandle, const char *prop)
{
const void *fdt_data = fdtbus_get_data();
const char *name;
const void *val;
int off, len;
if (fdt_data == NULL) {
return -1;
}
off = fdtbus_phandle2offset(phandle);
if (off < 0) {
return -1;
}
if (strcmp(prop, "name") == 0) {
val = fdt_get_name(fdt_data, off, &len);
if (val) {
const char *p = strchr(val, '@');
if (p) {
len = (uintptr_t)p - (uintptr_t)val + 1;
} else {
len += 1;
}
}
} else {
off = fdt_first_property_offset(fdt_data, off);
if (off < 0) {
return -1;
}
while (off >= 0) {
val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
if (val == NULL) {
return -1;
}
if (strcmp(name, prop) == 0) {
break;
}
off = fdt_next_property_offset(fdt_data, off);
if (off < 0) {
return -1;
}
}
}
if (val == NULL) {
return -1;
}
return len;
}
int
OF_setprop(int phandle, const char *prop, const void *buf, int buflen)
{
return -1;
}
int
OF_finddevice(const char *name)
{
const void *fdt_data = fdtbus_get_data();
int off;
if (fdt_data == NULL) {
return -1;
}
off = fdt_path_offset(fdt_data, name);
if (off < 0) {
return -1;
}
return fdtbus_offset2phandle(off);
}
int
OF_package_to_path(int phandle, char *buf, int buflen)
{
const void *fdt_data = fdtbus_get_data();
int off;
if (fdt_data == NULL) {
return -1;
}
off = fdtbus_phandle2offset(phandle);
if (off < 0) {
return -1;
}
if (fdt_get_path(fdt_data, off, buf, buflen) != 0)
return -1;
return strlen(buf);
}
