1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* prom_common.c: OF device tree support common code.
3 *
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
6 *
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
9 *
10 * Adapted for sparc by David S. Miller davem@davemloft.net
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/export.h>
15 #include <linux/errno.h>
16 #include <linux/mutex.h>
17 #include <linux/slab.h>
18 #include <linux/of.h>
19 #include <linux/of_pdt.h>
20 #include <asm/prom.h>
21 #include <asm/oplib.h>
22
23 #include "prom.h"
24
25 struct device_node *of_console_device;
26 EXPORT_SYMBOL(of_console_device);
27
28 char *of_console_path;
29 EXPORT_SYMBOL(of_console_path);
30
31 char *of_console_options;
32 EXPORT_SYMBOL(of_console_options);
33
34 int of_getintprop_default(struct device_node *np, const char *name, int def)
35 {
36 struct property *prop;
37 int len;
38
39 prop = of_find_property(np, name, &len);
40 if (!prop || len != 4)
41 return def;
42
43 return *(int *) prop->value;
44 }
45 EXPORT_SYMBOL(of_getintprop_default);
46
47 DEFINE_MUTEX(of_set_property_mutex);
48 EXPORT_SYMBOL(of_set_property_mutex);
49
50 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
51 {
52 struct property **prevp;
53 unsigned long flags;
54 void *new_val;
55 int err;
56
57 new_val = kmemdup(val, len, GFP_KERNEL);
58 if (!new_val)
59 return -ENOMEM;
60
61 err = -ENODEV;
62
63 mutex_lock(&of_set_property_mutex);
64 raw_spin_lock_irqsave(&devtree_lock, flags);
65 prevp = &dp->properties;
66 while (*prevp) {
67 struct property *prop = *prevp;
68
69 if (!strcasecmp(prop->name, name)) {
70 void *old_val = prop->value;
71 int ret;
72
73 ret = prom_setprop(dp->phandle, name, val, len);
74
75 err = -EINVAL;
76 if (ret >= 0) {
77 prop->value = new_val;
78 prop->length = len;
79
80 if (OF_IS_DYNAMIC(prop))
81 kfree(old_val);
82
83 OF_MARK_DYNAMIC(prop);
84
85 err = 0;
86 }
87 break;
88 }
89 prevp = &(*prevp)->next;
90 }
91 raw_spin_unlock_irqrestore(&devtree_lock, flags);
92 mutex_unlock(&of_set_property_mutex);
93
94 /* XXX Upate procfs if necessary... */
95
96 return err;
97 }
98 EXPORT_SYMBOL(of_set_property);
99
100 int of_find_in_proplist(const char *list, const char *match, int len)
101 {
102 while (len > 0) {
103 int l;
104
105 if (!strcmp(list, match))
106 return 1;
107 l = strlen(list) + 1;
108 list += l;
109 len -= l;
110 }
111 return 0;
112 }
113 EXPORT_SYMBOL(of_find_in_proplist);
114
115 /*
116 * SPARC32 and SPARC64's prom_nextprop() do things differently
117 * here, despite sharing the same interface. SPARC32 doesn't fill in 'buf',
118 * returning NULL on an error. SPARC64 fills in 'buf', but sets it to an
119 * empty string upon error.
120 */
121 static int __init handle_nextprop_quirks(char *buf, const char *name)
122 {
123 if (!name || strlen(name) == 0)
124 return -1;
125
126 #ifdef CONFIG_SPARC32
127 strcpy(buf, name);
128 #endif
129 return 0;
130 }
131
132 static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
133 {
134 const char *name;
135
136 buf[0] = '\0';
137 name = prom_nextprop(node, prev, buf);
138 return handle_nextprop_quirks(buf, name);
139 }
140
141 unsigned int prom_early_allocated __initdata;
142
143 static struct of_pdt_ops prom_sparc_ops __initdata = {
144 .nextprop = prom_common_nextprop,
145 .getproplen = prom_getproplen,
146 .getproperty = prom_getproperty,
147 .getchild = prom_getchild,
148 .getsibling = prom_getsibling,
149 };
150
151 void __init prom_build_devicetree(void)
152 {
153 of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
154 of_console_init();
155
156 pr_info("PROM: Built device tree with %u bytes of memory.\n",
157 prom_early_allocated);
158 }
159
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