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>
17 /* Return the child of node 'node' or zero if no this node has no
21 __prom_getchild(int node)
23 return p1275_cmd ("child", P1275_INOUT(1, 1), node);
27 prom_getchild(int node)
31 if(node == -1) return 0;
32 cnode = __prom_getchild(node);
33 if(cnode == -1) return 0;
38 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.
52 __prom_getsibling(int node)
54 return p1275_cmd ("peer", P1275_INOUT(1, 1), node);
58 prom_getsibling(int node)
62 if(node == -1) return 0;
63 sibnode = __prom_getsibling(node);
64 if(sibnode == -1) return 0;
68 /* Return the length in bytes of property 'prop' at node 'node'.
72 prom_getproplen(int node, char *prop)
74 if((!node) || (!prop)) return -1;
75 return p1275_cmd ("getproplen",
76 P1275_ARG(1,P1275_ARG_IN_STRING)|
81 /* Acquire a property 'prop' at node 'node' and place it in
82 * 'buffer' which has a size of 'bufsize'. If the acquisition
83 * was successful the length will be returned, else -1 is returned.
86 prom_getproperty(int node, char *prop, char *buffer, int bufsize)
90 plen = prom_getproplen(node, prop);
91 if((plen > bufsize) || (plen == 0) || (plen == -1))
94 /* Ok, things seem all right. */
95 return p1275_cmd ("getprop",
96 P1275_ARG(1,P1275_ARG_IN_STRING)|
97 P1275_ARG(2,P1275_ARG_OUT_BUF)|
99 node, prop, buffer, P1275_SIZE(plen));
103 /* Acquire an integer property and return its value. Returns -1
107 prom_getint(int node, char *prop)
111 if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
117 /* Acquire an integer property, upon error return the passed default
122 prom_getintdefault(int node, char *property, int deflt)
126 retval = prom_getint(node, property);
127 if(retval == -1) return deflt;
132 /* Acquire a boolean property, 1=TRUE 0=FALSE. */
134 prom_getbool(int node, char *prop)
138 retval = prom_getproplen(node, prop);
139 if(retval == -1) return 0;
143 /* Acquire a property whose value is a string, returns a null
144 * string on error. The char pointer is the user supplied string
148 prom_getstring(int node, char *prop, char *user_buf, int ubuf_size)
152 len = prom_getproperty(node, prop, user_buf, ubuf_size);
153 if(len != -1) return;
159 /* Does the device at node 'node' have name 'name'?
163 prom_nodematch(int node, char *name)
166 prom_getproperty(node, "name", namebuf, sizeof(namebuf));
167 if(strcmp(namebuf, name) == 0) return 1;
171 /* Search siblings at 'node_start' for a node with name
172 * 'nodename'. Return node if successful, zero if not.
175 prom_searchsiblings(int node_start, 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;
193 /* Gets name in the {name@x,yyyyy|name (if no reg)} form */
195 prom_getname (int node, char *buffer, int len)
198 int pci = 0, ebus = 0, ide = 0;
199 struct linux_prom_registers *reg;
200 struct linux_prom64_registers reg64[PROMREG_MAX];
202 for (sbus = prom_getparent (node); sbus; sbus = prom_getparent (sbus)) {
203 i = prom_getproperty (sbus, "name", buffer, len);
206 if (!strcmp (buffer, "sbus"))
210 if ((pci = prom_getparent (node))) {
211 i = prom_getproperty (pci, "name", buffer, len);
214 if (!strcmp (buffer, "pci"))
219 if ((ebus = prom_getparent (node))) {
220 i = prom_getproperty (ebus, "name", buffer, len);
223 if (!strcmp (buffer, "ebus"))
228 if ((ide = prom_getparent (node))) {
229 i = prom_getproperty (ide, "name", buffer, len);
232 if (!strcmp (buffer, "ide"))
238 i = prom_getproperty (node, "name", buffer, len);
245 i = prom_getproperty (node, "reg", (char *)reg64, sizeof (reg64));
246 if (i <= 0) return 0;
247 if (len < 16) return -1;
248 buffer = strchr (buffer, 0);
250 reg = (struct linux_prom_registers *)reg64;
251 sprintf (buffer, "@%x,%x", reg[0].which_io, (uint)reg[0].phys_addr);
254 reg = (struct linux_prom_registers *)reg64;
255 fn = (reg[0].which_io >> 8) & 0x07;
256 dev = (reg[0].which_io >> 11) & 0x1f;
258 sprintf (buffer, "@%x,%x", dev, fn);
260 sprintf (buffer, "@%x", dev);
262 reg = (struct linux_prom_registers *)reg64;
263 sprintf (buffer, "@%x,%x", reg[0].which_io, reg[0].phys_addr);
265 reg = (struct linux_prom_registers *)reg64;
266 sprintf (buffer, "@%x,%x", reg[0].which_io, reg[0].phys_addr);
267 } else if (i == 4) { /* Happens on 8042's children on Ultra/PCI. */
268 reg = (struct linux_prom_registers *)reg64;
269 sprintf (buffer, "@%x", reg[0].which_io);
271 sprintf (buffer, "@%x,%x",
272 (unsigned int)(reg64[0].phys_addr >> 36),
273 (unsigned int)(reg64[0].phys_addr));
278 /* Return the first property type for node 'node'.
279 * buffer should be at least 32B in length
282 prom_firstprop(int node, char *buffer)
285 if(node == -1) return buffer;
286 p1275_cmd ("nextprop", P1275_ARG(2,P1275_ARG_OUT_32B)|
288 node, (char *) 0x0, buffer);
292 /* Return the property type string after property type 'oprop'
293 * at node 'node' . Returns NULL string if no more
294 * property types for this node.
297 prom_nextprop(int node, char *oprop, char *buffer)
305 if (oprop == buffer) {
309 p1275_cmd ("nextprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
310 P1275_ARG(2,P1275_ARG_OUT_32B)|
312 node, oprop, buffer);
317 prom_finddevice(char *name)
320 return p1275_cmd ("finddevice", P1275_ARG(0,P1275_ARG_IN_STRING)|
325 int prom_node_has_property(int node, char *prop)
331 prom_nextprop(node, buf, buf);
332 if(!strcmp(buf, prop))
338 /* Set property 'pname' at node 'node' to value 'value' which has a length
339 * of 'size' bytes. Return the number of bytes the prom accepted.
342 prom_setprop(int node, char *pname, char *value, int size)
344 if(size == 0) return 0;
345 if((pname == 0) || (value == 0)) return 0;
347 return p1275_cmd ("setprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
348 P1275_ARG(2,P1275_ARG_IN_BUF)|
350 node, pname, value, P1275_SIZE(size));
354 prom_inst2pkg(int inst)
358 node = p1275_cmd ("instance-to-package", P1275_INOUT(1, 1), inst);
359 if (node == -1) return 0;
363 /* Return 'node' assigned to a particular prom 'path'
364 * FIXME: Should work for v0 as well
367 prom_pathtoinode(char *path)
371 inst = prom_devopen (path);
372 if (inst == 0) return 0;
373 node = prom_inst2pkg (inst);
374 prom_devclose (inst);
375 if (node == -1) return 0;