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dfa76060 DM |
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> | |
066bcaca | 18 | #include <linux/export.h> |
dfa76060 DM |
19 | #include <linux/errno.h> |
20 | #include <linux/mutex.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/of.h> | |
3cfc535c | 23 | #include <linux/of_pdt.h> |
dfa76060 DM |
24 | #include <asm/prom.h> |
25 | #include <asm/oplib.h> | |
e63829de | 26 | #include <asm/leon.h> |
dfa76060 DM |
27 | |
28 | #include "prom.h" | |
29 | ||
ad07aed8 DM |
30 | struct device_node *of_console_device; |
31 | EXPORT_SYMBOL(of_console_device); | |
32 | ||
33 | char *of_console_path; | |
34 | EXPORT_SYMBOL(of_console_path); | |
35 | ||
36 | char *of_console_options; | |
37 | EXPORT_SYMBOL(of_console_options); | |
38 | ||
dfa76060 DM |
39 | int of_getintprop_default(struct device_node *np, const char *name, int def) |
40 | { | |
41 | struct property *prop; | |
42 | int len; | |
43 | ||
44 | prop = of_find_property(np, name, &len); | |
45 | if (!prop || len != 4) | |
46 | return def; | |
47 | ||
48 | return *(int *) prop->value; | |
49 | } | |
50 | EXPORT_SYMBOL(of_getintprop_default); | |
51 | ||
52 | DEFINE_MUTEX(of_set_property_mutex); | |
53 | EXPORT_SYMBOL(of_set_property_mutex); | |
54 | ||
55 | int of_set_property(struct device_node *dp, const char *name, void *val, int len) | |
56 | { | |
57 | struct property **prevp; | |
58 | void *new_val; | |
59 | int err; | |
60 | ||
f0a4cf31 | 61 | new_val = kmemdup(val, len, GFP_KERNEL); |
dfa76060 DM |
62 | if (!new_val) |
63 | return -ENOMEM; | |
64 | ||
dfa76060 DM |
65 | err = -ENODEV; |
66 | ||
1c9d80dd | 67 | mutex_lock(&of_set_property_mutex); |
dfa76060 DM |
68 | write_lock(&devtree_lock); |
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 | ||
6016a363 | 77 | ret = prom_setprop(dp->phandle, name, val, len); |
dfa76060 DM |
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 | write_unlock(&devtree_lock); | |
1c9d80dd | 96 | mutex_unlock(&of_set_property_mutex); |
dfa76060 DM |
97 | |
98 | /* XXX Upate procfs if necessary... */ | |
99 | ||
100 | return err; | |
101 | } | |
102 | EXPORT_SYMBOL(of_set_property); | |
103 | ||
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 | ||
f90c34bd AS |
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 | */ | |
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 | ||
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 | ||
23dc758e DM |
145 | unsigned int prom_early_allocated __initdata; |
146 | ||
f90c34bd AS |
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 | ||
3cfc535c AS |
155 | void __init prom_build_devicetree(void) |
156 | { | |
f90c34bd | 157 | of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops); |
3cfc535c AS |
158 | of_console_init(); |
159 | ||
160 | pr_info("PROM: Built device tree with %u bytes of memory.\n", | |
161 | prom_early_allocated); | |
162 | } |