1 /* prom_common.c: OF device tree support common code.
2 *
3 * Paul Mackerras August 1996.
4 * Copyright (C) 1996-2005 Paul Mackerras.
5 *
6 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
7 * {engebret|bergner}@us.ibm.com
8 *
9 * Adapted for sparc by David S. Miller davem@davemloft.net
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/export.h>
19 #include <linux/errno.h>
20 #include <linux/mutex.h>
21 #include <linux/slab.h>
22 #include <linux/of.h>
23 #include <linux/of_pdt.h>
24 #include <asm/prom.h>
25 #include <asm/oplib.h>
26
27 #include "prom.h"
28
29 struct device_node *of_console_device;
30 EXPORT_SYMBOL(of_console_device);
31
32 char *of_console_path;
33 EXPORT_SYMBOL(of_console_path);
34
35 char *of_console_options;
36 EXPORT_SYMBOL(of_console_options);
37
of_getintprop_default(struct device_node * np,const char * name,int def)38 int of_getintprop_default(struct device_node *np, const char *name, int def)
39 {
40 struct property *prop;
41 int len;
42
43 prop = of_find_property(np, name, &len);
44 if (!prop || len != 4)
45 return def;
46
47 return *(int *) prop->value;
48 }
49 EXPORT_SYMBOL(of_getintprop_default);
50
51 DEFINE_MUTEX(of_set_property_mutex);
52 EXPORT_SYMBOL(of_set_property_mutex);
53
of_set_property(struct device_node * dp,const char * name,void * val,int len)54 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
55 {
56 struct property **prevp;
57 unsigned long flags;
58 void *new_val;
59 int err;
60
61 new_val = kmemdup(val, len, GFP_KERNEL);
62 if (!new_val)
63 return -ENOMEM;
64
65 err = -ENODEV;
66
67 mutex_lock(&of_set_property_mutex);
68 raw_spin_lock_irqsave(&devtree_lock, flags);
69 prevp = &dp->properties;
70 while (*prevp) {
71 struct property *prop = *prevp;
72
73 if (!strcasecmp(prop->name, name)) {
74 void *old_val = prop->value;
75 int ret;
76
77 ret = prom_setprop(dp->phandle, name, val, len);
78
79 err = -EINVAL;
80 if (ret >= 0) {
81 prop->value = new_val;
82 prop->length = len;
83
84 if (OF_IS_DYNAMIC(prop))
85 kfree(old_val);
86
87 OF_MARK_DYNAMIC(prop);
88
89 err = 0;
90 }
91 break;
92 }
93 prevp = &(*prevp)->next;
94 }
95 raw_spin_unlock_irqrestore(&devtree_lock, flags);
96 mutex_unlock(&of_set_property_mutex);
97
98 /* XXX Upate procfs if necessary... */
99
100 return err;
101 }
102 EXPORT_SYMBOL(of_set_property);
103
of_find_in_proplist(const char * list,const char * match,int len)104 int of_find_in_proplist(const char *list, const char *match, int len)
105 {
106 while (len > 0) {
107 int l;
108
109 if (!strcmp(list, match))
110 return 1;
111 l = strlen(list) + 1;
112 list += l;
113 len -= l;
114 }
115 return 0;
116 }
117 EXPORT_SYMBOL(of_find_in_proplist);
118
119 /*
120 * SPARC32 and SPARC64's prom_nextprop() do things differently
121 * here, despite sharing the same interface. SPARC32 doesn't fill in 'buf',
122 * returning NULL on an error. SPARC64 fills in 'buf', but sets it to an
123 * empty string upon error.
124 */
handle_nextprop_quirks(char * buf,const char * name)125 static int __init handle_nextprop_quirks(char *buf, const char *name)
126 {
127 if (!name || strlen(name) == 0)
128 return -1;
129
130 #ifdef CONFIG_SPARC32
131 strcpy(buf, name);
132 #endif
133 return 0;
134 }
135
prom_common_nextprop(phandle node,char * prev,char * buf)136 static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
137 {
138 const char *name;
139
140 buf[0] = '\0';
141 name = prom_nextprop(node, prev, buf);
142 return handle_nextprop_quirks(buf, name);
143 }
144
145 unsigned int prom_early_allocated __initdata;
146
147 static struct of_pdt_ops prom_sparc_ops __initdata = {
148 .nextprop = prom_common_nextprop,
149 .getproplen = prom_getproplen,
150 .getproperty = prom_getproperty,
151 .getchild = prom_getchild,
152 .getsibling = prom_getsibling,
153 };
154
prom_build_devicetree(void)155 void __init prom_build_devicetree(void)
156 {
157 of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
158 of_console_init();
159
160 pr_info("PROM: Built device tree with %u bytes of memory.\n",
161 prom_early_allocated);
162 }
163