summaryrefslogtreecommitdiffstats
path: root/arch/sparc/prom/tree_32.c
blob: f8860eba32c25840d42dc718899398dbd49946a6 (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
/*
 * tree.c: Basic device tree traversal/scanning for the Linux
 *         prom library.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */

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

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

extern void restore_current(void);

static char promlib_buf[128];

/* Internal version of prom_getchild that does not alter return values. */
static phandle __prom_getchild(phandle node)
{
	unsigned long flags;
	phandle cnode;

	spin_lock_irqsave(&prom_lock, flags);
	cnode = prom_nodeops->no_child(node);
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);

	return cnode;
}

/* Return the child of node 'node' or zero if no this node has no
 * direct descendent.
 */
phandle prom_getchild(phandle node)
{
	phandle cnode;

	if (node == -1)
		return 0;

	cnode = __prom_getchild(node);
	if (cnode == 0 || cnode == -1)
		return 0;

	return cnode;
}
EXPORT_SYMBOL(prom_getchild);

/* Internal version of prom_getsibling that does not alter return values. */
static phandle __prom_getsibling(phandle node)
{
	unsigned long flags;
	phandle cnode;

	spin_lock_irqsave(&prom_lock, flags);
	cnode = prom_nodeops->no_nextnode(node);
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);

	return cnode;
}

/* Return the next sibling of node 'node' or zero if no more siblings
 * at this level of depth in the tree.
 */
phandle prom_getsibling(phandle node)
{
	phandle sibnode;

	if (node == -1)
		return 0;

	sibnode = __prom_getsibling(node);
	if (sibnode == 0 || 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)
{
	int ret;
	unsigned long flags;

	if((!node) || (!prop))
		return -1;
		
	spin_lock_irqsave(&prom_lock, flags);
	ret = prom_nodeops->no_proplen(node, prop);
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);
	return ret;
}
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)
{
	int plen, ret;
	unsigned long flags;

	plen = prom_getproplen(node, prop);
	if((plen > bufsize) || (plen == 0) || (plen == -1))
		return -1;
	/* Ok, things seem all right. */
	spin_lock_irqsave(&prom_lock, flags);
	ret = prom_nodeops->no_getprop(node, prop, buffer);
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);
	return ret;
}
EXPORT_SYMBOL(prom_getproperty);

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


/* Search siblings at 'node_start' for a node with name
 * 'nodename'.  Return node if successful, zero if not.
 */
phandle prom_searchsiblings(phandle node_start, char *nodename)
{

	phandle thisnode;
	int error;

	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);

/* Interal version of nextprop that does not alter return values. */
static char *__prom_nextprop(phandle node, char * oprop)
{
	unsigned long flags;
	char *prop;

	spin_lock_irqsave(&prom_lock, flags);
	prop = prom_nodeops->no_nextprop(node, oprop);
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);

	return prop;
}

/* Return the property type string after property type 'oprop'
 * at node 'node' .  Returns empty string if no more
 * property types for this node.
 */
char *prom_nextprop(phandle node, char *oprop, char *buffer)
{
	if (node == 0 || node == -1)
		return "";

	return __prom_nextprop(node, oprop);
}
EXPORT_SYMBOL(prom_nextprop);

phandle prom_finddevice(char *name)
{
	char nbuf[128];
	char *s = name, *d;
	phandle node = prom_root_node, node2;
	unsigned int which_io, phys_addr;
	struct linux_prom_registers reg[PROMREG_MAX];

	while (*s++) {
		if (!*s) return node; /* path '.../' is legal */
		node = prom_getchild(node);

		for (d = nbuf; *s != 0 && *s != '@' && *s != '/';)
			*d++ = *s++;
		*d = 0;
		
		node = prom_searchsiblings(node, nbuf);
		if (!node)
			return 0;

		if (*s == '@') {
			if (isxdigit(s[1]) && s[2] == ',') {
				which_io = simple_strtoul(s+1, NULL, 16);
				phys_addr = simple_strtoul(s+3, &d, 16);
				if (d != s + 3 && (!*d || *d == '/')
				    && d <= s + 3 + 8) {
					node2 = node;
					while (node2 && node2 != -1) {
						if (prom_getproperty (node2, "reg", (char *)reg, sizeof (reg)) > 0) {
							if (which_io == reg[0].which_io && phys_addr == reg[0].phys_addr) {
								node = node2;
								break;
							}
						}
						node2 = prom_getsibling(node2);
						if (!node2 || node2 == -1)
							break;
						node2 = prom_searchsiblings(prom_getsibling(node2), nbuf);
					}
				}
			}
			while (*s != 0 && *s != '/') s++;
		}
	}
	return node;
}
EXPORT_SYMBOL(prom_finddevice);

/* 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 flags;
	int ret;

	if(size == 0) return 0;
	if((pname == 0) || (value == 0)) return 0;
	spin_lock_irqsave(&prom_lock, flags);
	ret = prom_nodeops->no_setprop(node, pname, value, size);
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);
	return ret;
}
EXPORT_SYMBOL(prom_setprop);

phandle prom_inst2pkg(int inst)
{
	phandle node;
	unsigned long flags;
	
	spin_lock_irqsave(&prom_lock, flags);
	node = (*romvec->pv_v2devops.v2_inst2pkg)(inst);
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);
	if (node == -1) return 0;
	return node;
}