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>
13 #include <linux/module.h>
15 #include <asm/openprom.h>
16 #include <asm/oplib.h>
19 /* Return the child of node 'node' or zero if no this node has no
22 inline int __prom_getchild(int node)
24 return p1275_cmd ("child", P1275_INOUT(1, 1), node);
27 inline int prom_getchild(int node)
31 if(node == -1) return 0;
32 cnode = __prom_getchild(node);
33 if(cnode == -1) return 0;
36 EXPORT_SYMBOL(prom_getchild);
38 inline int prom_getparent(int node)
42 if(node == -1) return 0;
43 cnode = p1275_cmd ("parent", P1275_INOUT(1, 1), node);
44 if(cnode == -1) return 0;
48 /* Return the next sibling of node 'node' or zero if no more siblings
49 * at this level of depth in the tree.
51 inline int __prom_getsibling(int node)
53 return p1275_cmd(prom_peer_name, P1275_INOUT(1, 1), node);
56 inline int prom_getsibling(int node)
62 sibnode = __prom_getsibling(node);
68 EXPORT_SYMBOL(prom_getsibling);
70 /* Return the length in bytes of property 'prop' at node 'node'.
73 inline int prom_getproplen(int node, const char *prop)
75 if((!node) || (!prop)) return -1;
76 return p1275_cmd ("getproplen",
77 P1275_ARG(1,P1275_ARG_IN_STRING)|
81 EXPORT_SYMBOL(prom_getproplen);
83 /* Acquire a property 'prop' at node 'node' and place it in
84 * 'buffer' which has a size of 'bufsize'. If the acquisition
85 * was successful the length will be returned, else -1 is returned.
87 inline int prom_getproperty(int node, const char *prop,
88 char *buffer, int bufsize)
92 plen = prom_getproplen(node, prop);
93 if ((plen > bufsize) || (plen == 0) || (plen == -1)) {
96 /* Ok, things seem all right. */
97 return p1275_cmd(prom_getprop_name,
98 P1275_ARG(1,P1275_ARG_IN_STRING)|
99 P1275_ARG(2,P1275_ARG_OUT_BUF)|
101 node, prop, buffer, P1275_SIZE(plen));
104 EXPORT_SYMBOL(prom_getproperty);
106 /* Acquire an integer property and return its value. Returns -1
109 inline int prom_getint(int node, const char *prop)
113 if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
118 EXPORT_SYMBOL(prom_getint);
120 /* Acquire an integer property, upon error return the passed default
124 int prom_getintdefault(int node, const char *property, int deflt)
128 retval = prom_getint(node, property);
129 if(retval == -1) return deflt;
133 EXPORT_SYMBOL(prom_getintdefault);
135 /* Acquire a boolean property, 1=TRUE 0=FALSE. */
136 int prom_getbool(int node, const char *prop)
140 retval = prom_getproplen(node, prop);
141 if(retval == -1) return 0;
144 EXPORT_SYMBOL(prom_getbool);
146 /* Acquire a property whose value is a string, returns a null
147 * string on error. The char pointer is the user supplied string
150 void prom_getstring(int node, const char *prop, char *user_buf, int ubuf_size)
154 len = prom_getproperty(node, prop, user_buf, ubuf_size);
155 if(len != -1) return;
159 EXPORT_SYMBOL(prom_getstring);
161 /* Does the device at node 'node' have name 'name'?
164 int prom_nodematch(int node, const char *name)
167 prom_getproperty(node, "name", namebuf, sizeof(namebuf));
168 if(strcmp(namebuf, name) == 0) return 1;
172 /* Search siblings at 'node_start' for a node with name
173 * 'nodename'. Return node if successful, zero if not.
175 int prom_searchsiblings(int node_start, const char *nodename)
179 char promlib_buf[128];
181 for(thisnode = node_start; thisnode;
182 thisnode=prom_getsibling(thisnode)) {
183 error = prom_getproperty(thisnode, "name", promlib_buf,
184 sizeof(promlib_buf));
185 /* Should this ever happen? */
186 if(error == -1) continue;
187 if(strcmp(nodename, promlib_buf)==0) return thisnode;
192 EXPORT_SYMBOL(prom_searchsiblings);
194 /* Return the first property type for node 'node'.
195 * buffer should be at least 32B in length
197 inline char *prom_firstprop(int node, char *buffer)
200 if(node == -1) return buffer;
201 p1275_cmd ("nextprop", P1275_ARG(2,P1275_ARG_OUT_32B)|
203 node, (char *) 0x0, buffer);
206 EXPORT_SYMBOL(prom_firstprop);
208 /* Return the property type string after property type 'oprop'
209 * at node 'node' . Returns NULL string if no more
210 * property types for this node.
212 inline char *prom_nextprop(int node, const char *oprop, char *buffer)
220 if (oprop == buffer) {
224 p1275_cmd ("nextprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
225 P1275_ARG(2,P1275_ARG_OUT_32B)|
227 node, oprop, buffer);
230 EXPORT_SYMBOL(prom_nextprop);
233 prom_finddevice(const char *name)
237 return p1275_cmd(prom_finddev_name,
238 P1275_ARG(0,P1275_ARG_IN_STRING)|
242 EXPORT_SYMBOL(prom_finddevice);
244 int prom_node_has_property(int node, const char *prop)
250 prom_nextprop(node, buf, buf);
251 if(!strcmp(buf, prop))
256 EXPORT_SYMBOL(prom_node_has_property);
258 /* Set property 'pname' at node 'node' to value 'value' which has a length
259 * of 'size' bytes. Return the number of bytes the prom accepted.
262 prom_setprop(int node, const char *pname, char *value, int size)
266 if ((pname == 0) || (value == 0))
269 #ifdef CONFIG_SUN_LDOMS
270 if (ldom_domaining_enabled) {
271 ldom_set_var(pname, value);
275 return p1275_cmd ("setprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
276 P1275_ARG(2,P1275_ARG_IN_BUF)|
278 node, pname, value, P1275_SIZE(size));
280 EXPORT_SYMBOL(prom_setprop);
282 inline int prom_inst2pkg(int inst)
286 node = p1275_cmd ("instance-to-package", P1275_INOUT(1, 1), inst);
287 if (node == -1) return 0;
291 /* Return 'node' assigned to a particular prom 'path'
292 * FIXME: Should work for v0 as well
295 prom_pathtoinode(const char *path)
299 inst = prom_devopen (path);
300 if (inst == 0) return 0;
301 node = prom_inst2pkg (inst);
302 prom_devclose (inst);
303 if (node == -1) return 0;
307 int prom_ihandle2path(int handle, char *buffer, int bufsize)
309 return p1275_cmd("instance-to-path",
310 P1275_ARG(1,P1275_ARG_OUT_BUF)|
312 handle, buffer, P1275_SIZE(bufsize));