aboutsummaryrefslogtreecommitdiff
path: root/drivers/of/pdt.c
blob: 37b56fd716e6683e97cfcc4c381e7246d86d77ee (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
/* pdt.c: OF PROM device tree support code.
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 *
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com
 *
 *  Adapted for sparc by David S. Miller davem@davemloft.net
 *  Adapted for multiple architectures by Andres Salomon <dilinger@queued.net>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_pdt.h>
#include <asm/prom.h>

static struct of_pdt_ops *of_pdt_prom_ops __initdata;

void __initdata (*of_pdt_build_more)(struct device_node *dp,
		struct device_node ***nextp);

#if defined(CONFIG_SPARC)
unsigned int of_pdt_unique_id __initdata;

#define of_pdt_incr_unique_id(p) do { \
	(p)->unique_id = of_pdt_unique_id++; \
} while (0)

static char * __init of_pdt_build_full_name(struct device_node *dp)
{
	int len, ourlen, plen;
	char *n;

	dp->path_component_name = build_path_component(dp);

	plen = strlen(dp->parent->full_name);
	ourlen = strlen(dp->path_component_name);
	len = ourlen + plen + 2;

	n = prom_early_alloc(len);
	strcpy(n, dp->parent->full_name);
	if (!of_node_is_root(dp->parent)) {
		strcpy(n + plen, "/");
		plen++;
	}
	strcpy(n + plen, dp->path_component_name);

	return n;
}

#else /* CONFIG_SPARC */

static inline void of_pdt_incr_unique_id(void *p) { }
static inline void irq_trans_init(struct device_node *dp) { }

static char * __init of_pdt_build_full_name(struct device_node *dp)
{
	static int failsafe_id = 0; /* for generating unique names on failure */
	char *buf;
	int len;

	if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len))
		goto failsafe;

	buf = prom_early_alloc(len + 1);
	if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len))
		goto failsafe;
	return buf;

 failsafe:
	buf = prom_early_alloc(strlen(dp->parent->full_name) +
			       strlen(dp->name) + 16);
	sprintf(buf, "%s/%s@unknown%i",
		of_node_is_root(dp->parent) ? "" : dp->parent->full_name,
		dp->name, failsafe_id++);
	pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf);
	return buf;
}

#endif /* !CONFIG_SPARC */

static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
					       char *special_name,
					       void *special_val,
					       int special_len)
{
	static struct property *tmp = NULL;
	struct property *p;
	int err;

	if (tmp) {
		p = tmp;
		memset(p, 0, sizeof(*p) + 32);
		tmp = NULL;
	} else {
		p = prom_early_alloc(sizeof(struct property) + 32);
		of_pdt_incr_unique_id(p);
	}

	p->name = (char *) (p + 1);
	if (special_name) {
		strcpy(p->name, special_name);
		p->length = special_len;
		p->value = prom_early_alloc(special_len);
		memcpy(p->value, special_val, special_len);
	} else {
		err = of_pdt_prom_ops->nextprop(node, prev, p->name);
		if (err) {
			tmp = p;
			return NULL;
		}
		p->length = of_pdt_prom_ops->getproplen(node, p->name);
		if (p->length <= 0) {
			p->length = 0;
		} else {
			int len;

			p->value = prom_early_alloc(p->length + 1);
			len = of_pdt_prom_ops->getproperty(node, p->name,
					p->value, p->length);
			if (len <= 0)
				p->length = 0;
			((unsigned char *)p->value)[p->length] = '\0';
		}
	}
	return p;
}

static struct property * __init of_pdt_build_prop_list(phandle node)
{
	struct property *head, *tail;

	head = tail = of_pdt_build_one_prop(node, NULL,
				     ".node", &node, sizeof(node));

	tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
	tail = tail->next;
	while(tail) {
		tail->next = of_pdt_build_one_prop(node, tail->name,
					    NULL, NULL, 0);
		tail = tail->next;
	}

	return head;
}

static char * __init of_pdt_get_one_property(phandle node, const char *name)
{
	char *buf = "<NULL>";
	int len;

	len = of_pdt_prom_ops->getproplen(node, name);
	if (len > 0) {
		buf = prom_early_alloc(len);
		len = of_pdt_prom_ops->getproperty(node, name, buf, len);
	}

	return buf;
}

static struct device_node * __init of_pdt_create_node(phandle node,
						    struct device_node *parent)
{
	struct device_node *dp;

	if (!node)
		return NULL;

	dp = prom_early_alloc(sizeof(*dp));
	of_pdt_incr_unique_id(dp);
	dp->parent = parent;

	kref_init(&dp->kref);

	dp->name = of_pdt_get_one_property(node, "name");
	dp->type = of_pdt_get_one_property(node, "device_type");
	dp->phandle = node;

	dp->properties = of_pdt_build_prop_list(node);

	irq_trans_init(dp);

	return dp;
}

static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
						   phandle node,
						   struct device_node ***nextp)
{
	struct device_node *ret = NULL, *prev_sibling = NULL;
	struct device_node *dp;

	while (1) {
		dp = of_pdt_create_node(node, parent);
		if (!dp)
			break;

		if (prev_sibling)
			prev_sibling->sibling = dp;

		if (!ret)
			ret = dp;
		prev_sibling = dp;

		*(*nextp) = dp;
		*nextp = &dp->allnext;

		dp->full_name = of_pdt_build_full_name(dp);

		dp->child = of_pdt_build_tree(dp,
				of_pdt_prom_ops->getchild(node), nextp);

		if (of_pdt_build_more)
			of_pdt_build_more(dp, nextp);

		node = of_pdt_prom_ops->getsibling(node);
	}

	return ret;
}

static void * __init kernel_tree_alloc(u64 size, u64 align)
{
	return prom_early_alloc(size);
}

void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
{
	struct device_node **nextp;

	BUG_ON(!ops);
	of_pdt_prom_ops = ops;

	of_allnodes = of_pdt_create_node(root_node, NULL);
#if defined(CONFIG_SPARC)
	of_allnodes->path_component_name = "";
#endif
	of_allnodes->full_name = "/";

	nextp = &of_allnodes->allnext;
	of_allnodes->child = of_pdt_build_tree(of_allnodes,
			of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp);

	/* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
	of_alias_scan(kernel_tree_alloc);
}