1 /* $Id: tree.c,v 1.10 1998/01/10 22:39:00 ecd Exp $
2 * tree.c: Basic device tree traversal/scanning for the Linux
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 #include <linux/string.h>
10 #include <linux/types.h>
11 #include <linux/kernel.h>
12 #include <linux/sched.h>
14 #include <asm/openprom.h>
15 #include <asm/oplib.h>
18 /* Return the child of node 'node' or zero if no this node has no
22 __prom_getchild(int node)
24 return p1275_cmd ("child", P1275_INOUT(1, 1), node);
28 prom_getchild(int node)
32 if(node == -1) return 0;
33 cnode = __prom_getchild(node);
34 if(cnode == -1) return 0;
39 prom_getparent(int node)
43 if(node == -1) return 0;
44 cnode = p1275_cmd ("parent", P1275_INOUT(1, 1), node);
45 if(cnode == -1) return 0;
49 /* Return the next sibling of node 'node' or zero if no more siblings
50 * at this level of depth in the tree.
53 __prom_getsibling(int node)
55 return p1275_cmd(prom_peer_name, P1275_INOUT(1, 1), node);
59 prom_getsibling(int node)
65 sibnode = __prom_getsibling(node);
72 /* Return the length in bytes of property 'prop' at node 'node'.
76 prom_getproplen(int node, const char *prop)
78 if((!node) || (!prop)) return -1;
79 return p1275_cmd ("getproplen",
80 P1275_ARG(1,P1275_ARG_IN_STRING)|
85 /* Acquire a property 'prop' at node 'node' and place it in
86 * 'buffer' which has a size of 'bufsize'. If the acquisition
87 * was successful the length will be returned, else -1 is returned.
90 prom_getproperty(int node, const char *prop, char *buffer, int bufsize)
94 plen = prom_getproplen(node, prop);
95 if ((plen > bufsize) || (plen == 0) || (plen == -1)) {
98 /* Ok, things seem all right. */
99 return p1275_cmd(prom_getprop_name,
100 P1275_ARG(1,P1275_ARG_IN_STRING)|
101 P1275_ARG(2,P1275_ARG_OUT_BUF)|
103 node, prop, buffer, P1275_SIZE(plen));
107 /* Acquire an integer property and return its value. Returns -1
111 prom_getint(int node, const char *prop)
115 if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
121 /* Acquire an integer property, upon error return the passed default
126 prom_getintdefault(int node, const char *property, int deflt)
130 retval = prom_getint(node, property);
131 if(retval == -1) return deflt;
136 /* Acquire a boolean property, 1=TRUE 0=FALSE. */
138 prom_getbool(int node, const char *prop)
142 retval = prom_getproplen(node, prop);
143 if(retval == -1) return 0;
147 /* Acquire a property whose value is a string, returns a null
148 * string on error. The char pointer is the user supplied string
152 prom_getstring(int node, const char *prop, char *user_buf, int ubuf_size)
156 len = prom_getproperty(node, prop, user_buf, ubuf_size);
157 if(len != -1) return;
163 /* Does the device at node 'node' have name 'name'?
167 prom_nodematch(int node, const char *name)
170 prom_getproperty(node, "name", namebuf, sizeof(namebuf));
171 if(strcmp(namebuf, name) == 0) return 1;
175 /* Search siblings at 'node_start' for a node with name
176 * 'nodename'. Return node if successful, zero if not.
179 prom_searchsiblings(int node_start, const char *nodename)
183 char promlib_buf[128];
185 for(thisnode = node_start; thisnode;
186 thisnode=prom_getsibling(thisnode)) {
187 error = prom_getproperty(thisnode, "name", promlib_buf,
188 sizeof(promlib_buf));
189 /* Should this ever happen? */
190 if(error == -1) continue;
191 if(strcmp(nodename, promlib_buf)==0) return thisnode;
197 /* Return the first property type for node 'node'.
198 * buffer should be at least 32B in length
201 prom_firstprop(int node, char *buffer)
204 if(node == -1) return buffer;
205 p1275_cmd ("nextprop", P1275_ARG(2,P1275_ARG_OUT_32B)|
207 node, (char *) 0x0, buffer);
211 /* Return the property type string after property type 'oprop'
212 * at node 'node' . Returns NULL string if no more
213 * property types for this node.
216 prom_nextprop(int node, const char *oprop, char *buffer)
224 if (oprop == buffer) {
228 p1275_cmd ("nextprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
229 P1275_ARG(2,P1275_ARG_OUT_32B)|
231 node, oprop, buffer);
236 prom_finddevice(const char *name)
240 return p1275_cmd(prom_finddev_name,
241 P1275_ARG(0,P1275_ARG_IN_STRING)|
246 int prom_node_has_property(int node, const char *prop)
252 prom_nextprop(node, buf, buf);
253 if(!strcmp(buf, prop))
259 /* Set property 'pname' at node 'node' to value 'value' which has a length
260 * of 'size' bytes. Return the number of bytes the prom accepted.
263 prom_setprop(int node, const char *pname, char *value, int size)
267 if ((pname == 0) || (value == 0))
270 #ifdef CONFIG_SUN_LDOMS
271 if (ldom_domaining_enabled) {
272 ldom_set_var(pname, value);
276 return p1275_cmd ("setprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
277 P1275_ARG(2,P1275_ARG_IN_BUF)|
279 node, pname, value, P1275_SIZE(size));
283 prom_inst2pkg(int inst)
287 node = p1275_cmd ("instance-to-package", P1275_INOUT(1, 1), inst);
288 if (node == -1) return 0;
292 /* Return 'node' assigned to a particular prom 'path'
293 * FIXME: Should work for v0 as well
296 prom_pathtoinode(const char *path)
300 inst = prom_devopen (path);
301 if (inst == 0) return 0;
302 node = prom_inst2pkg (inst);
303 prom_devclose (inst);
304 if (node == -1) return 0;
308 int prom_ihandle2path(int handle, char *buffer, int bufsize)
310 return p1275_cmd("instance-to-path",
311 P1275_ARG(1,P1275_ARG_OUT_BUF)|
313 handle, buffer, P1275_SIZE(bufsize));