325 lines
6.2 KiB
C
325 lines
6.2 KiB
C
/* $NetBSD: fdt_openfirm.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $ */
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/*-
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* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: fdt_openfirm.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $");
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#include <sys/param.h>
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#include <libfdt.h>
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#include <dev/fdt/fdtvar.h>
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int
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OF_peer(int phandle)
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{
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const void *fdt_data = fdtbus_get_data();
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int off, depth;
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if (fdt_data == NULL) {
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return -1;
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}
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if (phandle == 0) {
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return fdtbus_offset2phandle(0);
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}
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off = fdtbus_phandle2offset(phandle);
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if (off < 0) {
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return 0;
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}
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depth = 1;
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for (off = fdt_next_node(fdt_data, off, &depth);
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off >= 0 && depth >= 0;
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off = fdt_next_node(fdt_data, off, &depth)) {
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if (depth == 1) {
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return fdtbus_offset2phandle(off);
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}
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}
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return 0;
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}
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int
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OF_child(int phandle)
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{
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const void *fdt_data = fdtbus_get_data();
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int off, depth;
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if (fdt_data == NULL) {
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return -1;
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}
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off = fdtbus_phandle2offset(phandle);
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if (off < 0) {
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return 0;
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}
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depth = 0;
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for (off = fdt_next_node(fdt_data, off, &depth);
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off >= 0 && depth > 0;
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off = fdt_next_node(fdt_data, off, &depth)) {
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if (depth == 1) {
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return fdtbus_offset2phandle(off);
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}
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}
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return 0;
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}
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int
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OF_parent(int phandle)
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{
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const void *fdt_data = fdtbus_get_data();
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int off;
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if (fdt_data == NULL) {
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return -1;
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}
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off = fdtbus_phandle2offset(phandle);
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if (off < 0) {
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return -1;
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}
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off = fdt_parent_offset(fdt_data, off);
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if (off < 0) {
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return -1;
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}
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return fdtbus_offset2phandle(off);
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}
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int
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OF_nextprop(int phandle, const char *prop, void *nextprop)
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{
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const void *fdt_data = fdtbus_get_data();
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const char *name;
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const void *val;
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int off, len;
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if (fdt_data == NULL) {
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return -1;
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}
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off = fdtbus_phandle2offset(phandle);
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if (off < 0) {
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return -1;
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}
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if (*prop == '\0') {
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name = "name";
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} else {
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off = fdt_first_property_offset(fdt_data, off);
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if (off < 0) {
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return 0;
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}
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if (strcmp(prop, "name") != 0) {
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while (off >= 0) {
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val = fdt_getprop_by_offset(fdt_data, off,
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&name, &len);
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if (val == NULL) {
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return -1;
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}
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off = fdt_next_property_offset(fdt_data, off);
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if (off < 0) {
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return 0;
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}
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if (strcmp(name, prop) == 0)
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break;
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}
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}
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val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
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if (val == NULL) {
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return -1;
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}
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}
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strlcpy(nextprop, name, 33);
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return 1;
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}
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int
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OF_getprop(int phandle, const char *prop, void *buf, int buflen)
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{
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const void *fdt_data = fdtbus_get_data();
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const char *name;
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const void *val;
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int off, len;
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if (fdt_data == NULL) {
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return -1;
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}
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off = fdtbus_phandle2offset(phandle);
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if (off < 0) {
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return -1;
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}
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if (strcmp(prop, "name") == 0) {
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val = fdt_get_name(fdt_data, off, &len);
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if (val) {
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const char *p = strchr(val, '@');
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if (p) {
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len = (uintptr_t)p - (uintptr_t)val + 1;
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} else {
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len += 1;
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}
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}
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if (val == NULL || len > buflen) {
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return -1;
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}
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char *s = buf;
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memcpy(buf, val, len - 1);
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s[len - 1] = '\0';
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} else {
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off = fdt_first_property_offset(fdt_data, off);
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if (off < 0) {
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return -1;
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}
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while (off >= 0) {
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val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
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if (val == NULL) {
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return -1;
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}
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if (strcmp(name, prop) == 0) {
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break;
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}
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off = fdt_next_property_offset(fdt_data, off);
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if (off < 0) {
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return -1;
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}
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}
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if (val == NULL || len > buflen) {
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return -1;
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}
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memcpy(buf, val, len);
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}
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return len;
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}
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int
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OF_getproplen(int phandle, const char *prop)
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{
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const void *fdt_data = fdtbus_get_data();
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const char *name;
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const void *val;
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int off, len;
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if (fdt_data == NULL) {
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return -1;
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}
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off = fdtbus_phandle2offset(phandle);
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if (off < 0) {
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return -1;
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}
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if (strcmp(prop, "name") == 0) {
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val = fdt_get_name(fdt_data, off, &len);
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if (val) {
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const char *p = strchr(val, '@');
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if (p) {
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len = (uintptr_t)p - (uintptr_t)val + 1;
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} else {
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len += 1;
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}
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}
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} else {
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off = fdt_first_property_offset(fdt_data, off);
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if (off < 0) {
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return -1;
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}
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while (off >= 0) {
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val = fdt_getprop_by_offset(fdt_data, off, &name, &len);
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if (val == NULL) {
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return -1;
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}
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if (strcmp(name, prop) == 0) {
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break;
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}
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off = fdt_next_property_offset(fdt_data, off);
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if (off < 0) {
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return -1;
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}
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}
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}
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if (val == NULL) {
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return -1;
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}
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return len;
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}
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int
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OF_setprop(int phandle, const char *prop, const void *buf, int buflen)
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{
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return -1;
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}
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int
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OF_finddevice(const char *name)
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{
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const void *fdt_data = fdtbus_get_data();
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int off;
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if (fdt_data == NULL) {
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return -1;
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}
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off = fdt_path_offset(fdt_data, name);
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if (off < 0) {
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return -1;
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}
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return fdtbus_offset2phandle(off);
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}
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int
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OF_package_to_path(int phandle, char *buf, int buflen)
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{
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const void *fdt_data = fdtbus_get_data();
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int off;
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if (fdt_data == NULL) {
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return -1;
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}
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off = fdtbus_phandle2offset(phandle);
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if (off < 0) {
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return -1;
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}
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if (fdt_get_path(fdt_data, off, buf, buflen) != 0)
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return -1;
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return strlen(buf);
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}
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