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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
29struct device_node *of_console_device;
30EXPORT_SYMBOL(of_console_device);
31
32char *of_console_path;
33EXPORT_SYMBOL(of_console_path);
34
35char *of_console_options;
36EXPORT_SYMBOL(of_console_options);
37
38int 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}
49EXPORT_SYMBOL(of_getintprop_default);
50
51DEFINE_MUTEX(of_set_property_mutex);
52EXPORT_SYMBOL(of_set_property_mutex);
53
54int of_set_property(struct device_node *dp, const char *name, void *val, int len)
55{
56 struct property **prevp;
57 void *new_val;
58 int err;
59
60 new_val = kmemdup(val, len, GFP_KERNEL);
61 if (!new_val)
62 return -ENOMEM;
63
64 err = -ENODEV;
65
66 mutex_lock(&of_set_property_mutex);
67 write_lock(&devtree_lock);
68 prevp = &dp->properties;
69 while (*prevp) {
70 struct property *prop = *prevp;
71
72 if (!strcasecmp(prop->name, name)) {
73 void *old_val = prop->value;
74 int ret;
75
76 ret = prom_setprop(dp->phandle, name, val, len);
77
78 err = -EINVAL;
79 if (ret >= 0) {
80 prop->value = new_val;
81 prop->length = len;
82
83 if (OF_IS_DYNAMIC(prop))
84 kfree(old_val);
85
86 OF_MARK_DYNAMIC(prop);
87
88 err = 0;
89 }
90 break;
91 }
92 prevp = &(*prevp)->next;
93 }
94 write_unlock(&devtree_lock);
95 mutex_unlock(&of_set_property_mutex);
96
97 /* XXX Upate procfs if necessary... */
98
99 return err;
100}
101EXPORT_SYMBOL(of_set_property);
102
103int of_find_in_proplist(const char *list, const char *match, int len)
104{
105 while (len > 0) {
106 int l;
107
108 if (!strcmp(list, match))
109 return 1;
110 l = strlen(list) + 1;
111 list += l;
112 len -= l;
113 }
114 return 0;
115}
116EXPORT_SYMBOL(of_find_in_proplist);
117
118/*
119 * SPARC32 and SPARC64's prom_nextprop() do things differently
120 * here, despite sharing the same interface. SPARC32 doesn't fill in 'buf',
121 * returning NULL on an error. SPARC64 fills in 'buf', but sets it to an
122 * empty string upon error.
123 */
124static int __init handle_nextprop_quirks(char *buf, const char *name)
125{
126 if (!name || strlen(name) == 0)
127 return -1;
128
129#ifdef CONFIG_SPARC32
130 strcpy(buf, name);
131#endif
132 return 0;
133}
134
135static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
136{
137 const char *name;
138
139 buf[0] = '\0';
140 name = prom_nextprop(node, prev, buf);
141 return handle_nextprop_quirks(buf, name);
142}
143
144unsigned int prom_early_allocated __initdata;
145
146static struct of_pdt_ops prom_sparc_ops __initdata = {
147 .nextprop = prom_common_nextprop,
148 .getproplen = prom_getproplen,
149 .getproperty = prom_getproperty,
150 .getchild = prom_getchild,
151 .getsibling = prom_getsibling,
152};
153
154void __init prom_build_devicetree(void)
155{
156 of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
157 of_console_init();
158
159 pr_info("PROM: Built device tree with %u bytes of memory.\n",
160 prom_early_allocated);
161}
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
25struct device_node *of_console_device;
26EXPORT_SYMBOL(of_console_device);
27
28char *of_console_path;
29EXPORT_SYMBOL(of_console_path);
30
31char *of_console_options;
32EXPORT_SYMBOL(of_console_options);
33
34int 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}
45EXPORT_SYMBOL(of_getintprop_default);
46
47DEFINE_MUTEX(of_set_property_mutex);
48EXPORT_SYMBOL(of_set_property_mutex);
49
50int 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}
98EXPORT_SYMBOL(of_set_property);
99
100int 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}
113EXPORT_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 */
121static 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
132static 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
141unsigned int prom_early_allocated __initdata;
142
143static 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
151void __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}