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 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 54 int 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 } 101 EXPORT_SYMBOL(of_set_property); 102 103 int 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 } 116 EXPORT_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 */ 124 static 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 } 134 135 static 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 } 143 144 unsigned int prom_early_allocated __initdata; 145 146 static 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 }; 153 154 void __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 } 162