1 /* pdt.c: OF PROM device tree support 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 * Adapted for multiple architectures by Andres Salomon <dilinger@queued.net> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/errno.h> 21 #include <linux/mutex.h> 22 #include <linux/slab.h> 23 #include <linux/of.h> 24 #include <linux/of_pdt.h> 25 26 static struct of_pdt_ops *of_pdt_prom_ops __initdata; 27 28 void __initdata (*of_pdt_build_more)(struct device_node *dp); 29 30 #if defined(CONFIG_SPARC) 31 unsigned int of_pdt_unique_id __initdata; 32 33 #define of_pdt_incr_unique_id(p) do { \ 34 (p)->unique_id = of_pdt_unique_id++; \ 35 } while (0) 36 37 static char * __init of_pdt_build_full_name(struct device_node *dp) 38 { 39 int len, ourlen, plen; 40 char *n; 41 42 dp->path_component_name = build_path_component(dp); 43 44 plen = strlen(dp->parent->full_name); 45 ourlen = strlen(dp->path_component_name); 46 len = ourlen + plen + 2; 47 48 n = prom_early_alloc(len); 49 strcpy(n, dp->parent->full_name); 50 if (!of_node_is_root(dp->parent)) { 51 strcpy(n + plen, "/"); 52 plen++; 53 } 54 strcpy(n + plen, dp->path_component_name); 55 56 return n; 57 } 58 59 #else /* CONFIG_SPARC */ 60 61 static inline void of_pdt_incr_unique_id(void *p) { } 62 static inline void irq_trans_init(struct device_node *dp) { } 63 64 static char * __init of_pdt_build_full_name(struct device_node *dp) 65 { 66 static int failsafe_id = 0; /* for generating unique names on failure */ 67 char *buf; 68 int len; 69 70 if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len)) 71 goto failsafe; 72 73 buf = prom_early_alloc(len + 1); 74 if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len)) 75 goto failsafe; 76 return buf; 77 78 failsafe: 79 buf = prom_early_alloc(strlen(dp->parent->full_name) + 80 strlen(dp->name) + 16); 81 sprintf(buf, "%s/%s@unknown%i", 82 of_node_is_root(dp->parent) ? "" : dp->parent->full_name, 83 dp->name, failsafe_id++); 84 pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf); 85 return buf; 86 } 87 88 #endif /* !CONFIG_SPARC */ 89 90 static struct property * __init of_pdt_build_one_prop(phandle node, char *prev, 91 char *special_name, 92 void *special_val, 93 int special_len) 94 { 95 static struct property *tmp = NULL; 96 struct property *p; 97 int err; 98 99 if (tmp) { 100 p = tmp; 101 memset(p, 0, sizeof(*p) + 32); 102 tmp = NULL; 103 } else { 104 p = prom_early_alloc(sizeof(struct property) + 32); 105 of_pdt_incr_unique_id(p); 106 } 107 108 p->name = (char *) (p + 1); 109 if (special_name) { 110 strcpy(p->name, special_name); 111 p->length = special_len; 112 p->value = prom_early_alloc(special_len); 113 memcpy(p->value, special_val, special_len); 114 } else { 115 err = of_pdt_prom_ops->nextprop(node, prev, p->name); 116 if (err) { 117 tmp = p; 118 return NULL; 119 } 120 p->length = of_pdt_prom_ops->getproplen(node, p->name); 121 if (p->length <= 0) { 122 p->length = 0; 123 } else { 124 int len; 125 126 p->value = prom_early_alloc(p->length + 1); 127 len = of_pdt_prom_ops->getproperty(node, p->name, 128 p->value, p->length); 129 if (len <= 0) 130 p->length = 0; 131 ((unsigned char *)p->value)[p->length] = '\0'; 132 } 133 } 134 return p; 135 } 136 137 static struct property * __init of_pdt_build_prop_list(phandle node) 138 { 139 struct property *head, *tail; 140 141 head = tail = of_pdt_build_one_prop(node, NULL, 142 ".node", &node, sizeof(node)); 143 144 tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0); 145 tail = tail->next; 146 while(tail) { 147 tail->next = of_pdt_build_one_prop(node, tail->name, 148 NULL, NULL, 0); 149 tail = tail->next; 150 } 151 152 return head; 153 } 154 155 static char * __init of_pdt_get_one_property(phandle node, const char *name) 156 { 157 char *buf = "<NULL>"; 158 int len; 159 160 len = of_pdt_prom_ops->getproplen(node, name); 161 if (len > 0) { 162 buf = prom_early_alloc(len); 163 len = of_pdt_prom_ops->getproperty(node, name, buf, len); 164 } 165 166 return buf; 167 } 168 169 static struct device_node * __init of_pdt_create_node(phandle node, 170 struct device_node *parent) 171 { 172 struct device_node *dp; 173 174 if (!node) 175 return NULL; 176 177 dp = prom_early_alloc(sizeof(*dp)); 178 of_node_init(dp); 179 of_pdt_incr_unique_id(dp); 180 dp->parent = parent; 181 182 dp->name = of_pdt_get_one_property(node, "name"); 183 dp->type = of_pdt_get_one_property(node, "device_type"); 184 dp->phandle = node; 185 186 dp->properties = of_pdt_build_prop_list(node); 187 188 irq_trans_init(dp); 189 190 return dp; 191 } 192 193 static struct device_node * __init of_pdt_build_tree(struct device_node *parent, 194 phandle node) 195 { 196 struct device_node *ret = NULL, *prev_sibling = NULL; 197 struct device_node *dp; 198 199 while (1) { 200 dp = of_pdt_create_node(node, parent); 201 if (!dp) 202 break; 203 204 if (prev_sibling) 205 prev_sibling->sibling = dp; 206 207 if (!ret) 208 ret = dp; 209 prev_sibling = dp; 210 211 dp->full_name = of_pdt_build_full_name(dp); 212 213 dp->child = of_pdt_build_tree(dp, of_pdt_prom_ops->getchild(node)); 214 215 if (of_pdt_build_more) 216 of_pdt_build_more(dp); 217 218 node = of_pdt_prom_ops->getsibling(node); 219 } 220 221 return ret; 222 } 223 224 static void * __init kernel_tree_alloc(u64 size, u64 align) 225 { 226 return prom_early_alloc(size); 227 } 228 229 void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) 230 { 231 BUG_ON(!ops); 232 of_pdt_prom_ops = ops; 233 234 of_root = of_pdt_create_node(root_node, NULL); 235 #if defined(CONFIG_SPARC) 236 of_root->path_component_name = ""; 237 #endif 238 of_root->full_name = "/"; 239 240 of_root->child = of_pdt_build_tree(of_root, 241 of_pdt_prom_ops->getchild(of_root->phandle)); 242 243 /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ 244 of_alias_scan(kernel_tree_alloc); 245 } 246