summaryrefslogtreecommitdiffstats
path: root/arch/sparc/prom/tree_64.c
blob: 989e7992d6297261b95be58c843343b9450db911 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
// SPDX-License-Identifier: GPL-2.0
/*
 * tree.c: Basic device tree traversal/scanning for the Linux
 *         prom library.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/string.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>

#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/ldc.h>

static phandle prom_node_to_node(const char *type, phandle node)
{
	unsigned long args[5];

	args[0] = (unsigned long) type;
	args[1] = 1;
	args[2] = 1;
	args[3] = (unsigned int) node;
	args[4] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return (phandle) args[4];
}

/* Return the child of node 'node' or zero if no this node has no
 * direct descendent.
 */
inline phandle __prom_getchild(phandle node)
{
	return prom_node_to_node("child", node);
}

phandle prom_getchild(phandle node)
{
	phandle cnode;

	if ((s32)node == -1)
		return 0;
	cnode = __prom_getchild(node);
	if ((s32)cnode == -1)
		return 0;
	return cnode;
}
EXPORT_SYMBOL(prom_getchild);

inline phandle prom_getparent(phandle node)
{
	phandle cnode;

	if ((s32)node == -1)
		return 0;
	cnode = prom_node_to_node("parent", node);
	if ((s32)cnode == -1)
		return 0;
	return cnode;
}

/* Return the next sibling of node 'node' or zero if no more siblings
 * at this level of depth in the tree.
 */
inline phandle __prom_getsibling(phandle node)
{
	return prom_node_to_node(prom_peer_name, node);
}

phandle prom_getsibling(phandle node)
{
	phandle sibnode;

	if ((s32)node == -1)
		return 0;
	sibnode = __prom_getsibling(node);
	if ((s32)sibnode == -1)
		return 0;

	return sibnode;
}
EXPORT_SYMBOL(prom_getsibling);

/* Return the length in bytes of property 'prop' at node 'node'.
 * Return -1 on error.
 */
int prom_getproplen(phandle node, const char *prop)
{
	unsigned long args[6];

	if (!node || !prop)
		return -1;

	args[0] = (unsigned long) "getproplen";
	args[1] = 2;
	args[2] = 1;
	args[3] = (unsigned int) node;
	args[4] = (unsigned long) prop;
	args[5] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return (int) args[5];
}
EXPORT_SYMBOL(prom_getproplen);

/* Acquire a property 'prop' at node 'node' and place it in
 * 'buffer' which has a size of 'bufsize'.  If the acquisition
 * was successful the length will be returned, else -1 is returned.
 */
int prom_getproperty(phandle node, const char *prop,
		     char *buffer, int bufsize)
{
	unsigned long args[8];
	int plen;

	plen = prom_getproplen(node, prop);
	if ((plen > bufsize) || (plen == 0) || (plen == -1))
		return -1;

	args[0] = (unsigned long) prom_getprop_name;
	args[1] = 4;
	args[2] = 1;
	args[3] = (unsigned int) node;
	args[4] = (unsigned long) prop;
	args[5] = (unsigned long) buffer;
	args[6] = bufsize;
	args[7] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return (int) args[7];
}
EXPORT_SYMBOL(prom_getproperty);

/* Acquire an integer property and return its value.  Returns -1
 * on failure.
 */
int prom_getint(phandle node, const char *prop)
{
	int intprop;

	if (prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
		return intprop;

	return -1;
}
EXPORT_SYMBOL(prom_getint);

/* Acquire an integer property, upon error return the passed default
 * integer.
 */

int prom_getintdefault(phandle node, const char *property, int deflt)
{
	int retval;

	retval = prom_getint(node, property);
	if (retval == -1)
		return deflt;

	return retval;
}
EXPORT_SYMBOL(prom_getintdefault);

/* Acquire a boolean property, 1=TRUE 0=FALSE. */
int prom_getbool(phandle node, const char *prop)
{
	int retval;

	retval = prom_getproplen(node, prop);
	if (retval == -1)
		return 0;
	return 1;
}
EXPORT_SYMBOL(prom_getbool);

/* Acquire a property whose value is a string, returns a null
 * string on error.  The char pointer is the user supplied string
 * buffer.
 */
void prom_getstring(phandle node, const char *prop, char *user_buf,
		int ubuf_size)
{
	int len;

	len = prom_getproperty(node, prop, user_buf, ubuf_size);
	if (len != -1)
		return;
	user_buf[0] = 0;
}
EXPORT_SYMBOL(prom_getstring);

/* Does the device at node 'node' have name 'name'?
 * YES = 1   NO = 0
 */
int prom_nodematch(phandle node, const char *name)
{
	char namebuf[128];
	prom_getproperty(node, "name", namebuf, sizeof(namebuf));
	if (strcmp(namebuf, name) == 0)
		return 1;
	return 0;
}

/* Search siblings at 'node_start' for a node with name
 * 'nodename'.  Return node if successful, zero if not.
 */
phandle prom_searchsiblings(phandle node_start, const char *nodename)
{
	phandle thisnode;
	int error;
	char promlib_buf[128];

	for(thisnode = node_start; thisnode;
	    thisnode=prom_getsibling(thisnode)) {
		error = prom_getproperty(thisnode, "name", promlib_buf,
					 sizeof(promlib_buf));
		/* Should this ever happen? */
		if(error == -1) continue;
		if(strcmp(nodename, promlib_buf)==0) return thisnode;
	}

	return 0;
}
EXPORT_SYMBOL(prom_searchsiblings);

static const char *prom_nextprop_name = "nextprop";

/* Return the first property type for node 'node'.
 * buffer should be at least 32B in length
 */
char *prom_firstprop(phandle node, char *buffer)
{
	unsigned long args[7];

	*buffer = 0;
	if ((s32)node == -1)
		return buffer;

	args[0] = (unsigned long) prom_nextprop_name;
	args[1] = 3;
	args[2] = 1;
	args[3] = (unsigned int) node;
	args[4] = 0;
	args[5] = (unsigned long) buffer;
	args[6] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return buffer;
}
EXPORT_SYMBOL(prom_firstprop);

/* Return the property type string after property type 'oprop'
 * at node 'node' .  Returns NULL string if no more
 * property types for this node.
 */
char *prom_nextprop(phandle node, const char *oprop, char *buffer)
{
	unsigned long args[7];
	char buf[32];

	if ((s32)node == -1) {
		*buffer = 0;
		return buffer;
	}
	if (oprop == buffer) {
		strcpy (buf, oprop);
		oprop = buf;
	}

	args[0] = (unsigned long) prom_nextprop_name;
	args[1] = 3;
	args[2] = 1;
	args[3] = (unsigned int) node;
	args[4] = (unsigned long) oprop;
	args[5] = (unsigned long) buffer;
	args[6] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return buffer;
}
EXPORT_SYMBOL(prom_nextprop);

phandle prom_finddevice(const char *name)
{
	unsigned long args[5];

	if (!name)
		return 0;
	args[0] = (unsigned long) "finddevice";
	args[1] = 1;
	args[2] = 1;
	args[3] = (unsigned long) name;
	args[4] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return (int) args[4];
}
EXPORT_SYMBOL(prom_finddevice);

int prom_node_has_property(phandle node, const char *prop)
{
	char buf [32];
        
	*buf = 0;
	do {
		prom_nextprop(node, buf, buf);
		if (!strcmp(buf, prop))
			return 1;
	} while (*buf);
	return 0;
}
EXPORT_SYMBOL(prom_node_has_property);

/* Set property 'pname' at node 'node' to value 'value' which has a length
 * of 'size' bytes.  Return the number of bytes the prom accepted.
 */
int
prom_setprop(phandle node, const char *pname, char *value, int size)
{
	unsigned long args[8];

	if (size == 0)
		return 0;
	if ((pname == 0) || (value == 0))
		return 0;
	
#ifdef CONFIG_SUN_LDOMS
	if (ldom_domaining_enabled) {
		ldom_set_var(pname, value);
		return 0;
	}
#endif
	args[0] = (unsigned long) "setprop";
	args[1] = 4;
	args[2] = 1;
	args[3] = (unsigned int) node;
	args[4] = (unsigned long) pname;
	args[5] = (unsigned long) value;
	args[6] = size;
	args[7] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return (int) args[7];
}
EXPORT_SYMBOL(prom_setprop);

inline phandle prom_inst2pkg(int inst)
{
	unsigned long args[5];
	phandle node;
	
	args[0] = (unsigned long) "instance-to-package";
	args[1] = 1;
	args[2] = 1;
	args[3] = (unsigned int) inst;
	args[4] = (unsigned long) -1;

	p1275_cmd_direct(args);

	node = (int) args[4];
	if ((s32)node == -1)
		return 0;
	return node;
}

int prom_ihandle2path(int handle, char *buffer, int bufsize)
{
	unsigned long args[7];

	args[0] = (unsigned long) "instance-to-path";
	args[1] = 3;
	args[2] = 1;
	args[3] = (unsigned int) handle;
	args[4] = (unsigned long) buffer;
	args[5] = bufsize;
	args[6] = (unsigned long) -1;

	p1275_cmd_direct(args);

	return (int) args[6];
}
OpenPOWER on IntegriCloud