arch/sparc/prom/tree_32.c

   1 /*
   2  * tree.c: Basic device tree traversal/scanning for the Linux
   3  *         prom library.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  */
   7
   8 #include <linux/string.h>
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/ctype.h>
  13 #include <linux/module.h>
  14
  15 #include <asm/openprom.h>
  16 #include <asm/oplib.h>
  17
  18 extern void restore_current(void);
  19
  20 static char promlib_buf[128];
  21
  22 /* Internal version of prom_getchild that does not alter return values. */
  23 int __prom_getchild(int node)
  24 {
  25         unsigned long flags;
  26         int cnode;
  27
  28         spin_lock_irqsave(&prom_lock, flags);
  29         cnode = prom_nodeops->no_child(node);
  30         restore_current();
  31         spin_unlock_irqrestore(&prom_lock, flags);
  32
  33         return cnode;
  34 }
  35
  36 /* Return the child of node 'node' or zero if no this node has no
  37  * direct descendent.
  38  */
  39 int prom_getchild(int node)
  40 {
  41         int cnode;
  42
  43         if (node == -1)
  44                 return 0;
  45
  46         cnode = __prom_getchild(node);
  47         if (cnode == 0 || cnode == -1)
  48                 return 0;
  49
  50         return cnode;
  51 }
  52 EXPORT_SYMBOL(prom_getchild);
  53
  54 /* Internal version of prom_getsibling that does not alter return values. */
  55 int __prom_getsibling(int node)
  56 {
  57         unsigned long flags;
  58         int cnode;
  59
  60         spin_lock_irqsave(&prom_lock, flags);
  61         cnode = prom_nodeops->no_nextnode(node);
  62         restore_current();
  63         spin_unlock_irqrestore(&prom_lock, flags);
  64
  65         return cnode;
  66 }
  67
  68 /* Return the next sibling of node 'node' or zero if no more siblings
  69  * at this level of depth in the tree.
  70  */
  71 int prom_getsibling(int node)
  72 {
  73         int sibnode;
  74
  75         if (node == -1)
  76                 return 0;
  77
  78         sibnode = __prom_getsibling(node);
  79         if (sibnode == 0 || sibnode == -1)
  80                 return 0;
  81
  82         return sibnode;
  83 }
  84 EXPORT_SYMBOL(prom_getsibling);
  85
  86 /* Return the length in bytes of property 'prop' at node 'node'.
  87  * Return -1 on error.
  88  */
  89 int prom_getproplen(int node, const char *prop)
  90 {
  91         int ret;
  92         unsigned long flags;
  93
  94         if((!node) || (!prop))
  95                 return -1;
  96
  97         spin_lock_irqsave(&prom_lock, flags);
  98         ret = prom_nodeops->no_proplen(node, prop);
  99         restore_current();
 100         spin_unlock_irqrestore(&prom_lock, flags);
 101         return ret;
 102 }
 103 EXPORT_SYMBOL(prom_getproplen);
 104
 105 /* Acquire a property 'prop' at node 'node' and place it in
 106  * 'buffer' which has a size of 'bufsize'.  If the acquisition
 107  * was successful the length will be returned, else -1 is returned.
 108  */
 109 int prom_getproperty(int node, const char *prop, char *buffer, int bufsize)
 110 {
 111         int plen, ret;
 112         unsigned long flags;
 113
 114         plen = prom_getproplen(node, prop);
 115         if((plen > bufsize) || (plen == 0) || (plen == -1))
 116                 return -1;
 117         /* Ok, things seem all right. */
 118         spin_lock_irqsave(&prom_lock, flags);
 119         ret = prom_nodeops->no_getprop(node, prop, buffer);
 120         restore_current();
 121         spin_unlock_irqrestore(&prom_lock, flags);
 122         return ret;
 123 }
 124 EXPORT_SYMBOL(prom_getproperty);
 125
 126 /* Acquire an integer property and return its value.  Returns -1
 127  * on failure.
 128  */
 129 int prom_getint(int node, char *prop)
 130 {
 131         static int intprop;
 132
 133         if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
 134                 return intprop;
 135
 136         return -1;
 137 }
 138 EXPORT_SYMBOL(prom_getint);
 139
 140 /* Acquire an integer property, upon error return the passed default
 141  * integer.
 142  */
 143 int prom_getintdefault(int node, char *property, int deflt)
 144 {
 145         int retval;
 146
 147         retval = prom_getint(node, property);
 148         if(retval == -1) return deflt;
 149
 150         return retval;
 151 }
 152 EXPORT_SYMBOL(prom_getintdefault);
 153
 154 /* Acquire a boolean property, 1=TRUE 0=FALSE. */
 155 int prom_getbool(int node, char *prop)
 156 {
 157         int retval;
 158
 159         retval = prom_getproplen(node, prop);
 160         if(retval == -1) return 0;
 161         return 1;
 162 }
 163 EXPORT_SYMBOL(prom_getbool);
 164
 165 /* Acquire a property whose value is a string, returns a null
 166  * string on error.  The char pointer is the user supplied string
 167  * buffer.
 168  */
 169 void prom_getstring(int node, char *prop, char *user_buf, int ubuf_size)
 170 {
 171         int len;
 172
 173         len = prom_getproperty(node, prop, user_buf, ubuf_size);
 174         if(len != -1) return;
 175         user_buf[0] = 0;
 176 }
 177 EXPORT_SYMBOL(prom_getstring);
 178
 179
 180 /* Does the device at node 'node' have name 'name'?
 181  * YES = 1   NO = 0
 182  */
 183 int prom_nodematch(int node, char *name)
 184 {
 185         int error;
 186
 187         static char namebuf[128];
 188         error = prom_getproperty(node, "name", namebuf, sizeof(namebuf));
 189         if (error == -1) return 0;
 190         if(strcmp(namebuf, name) == 0) return 1;
 191         return 0;
 192 }
 193
 194 /* Search siblings at 'node_start' for a node with name
 195  * 'nodename'.  Return node if successful, zero if not.
 196  */
 197 int prom_searchsiblings(int node_start, char *nodename)
 198 {
 199
 200         int thisnode, error;
 201
 202         for(thisnode = node_start; thisnode;
 203             thisnode=prom_getsibling(thisnode)) {
 204                 error = prom_getproperty(thisnode, "name", promlib_buf,
 205                                          sizeof(promlib_buf));
 206                 /* Should this ever happen? */
 207                 if(error == -1) continue;
 208                 if(strcmp(nodename, promlib_buf)==0) return thisnode;
 209         }
 210
 211         return 0;
 212 }
 213 EXPORT_SYMBOL(prom_searchsiblings);
 214
 215 /* Interal version of nextprop that does not alter return values. */
 216 char * __prom_nextprop(int node, char * oprop)
 217 {
 218         unsigned long flags;
 219         char *prop;
 220
 221         spin_lock_irqsave(&prom_lock, flags);
 222         prop = prom_nodeops->no_nextprop(node, oprop);
 223         restore_current();
 224         spin_unlock_irqrestore(&prom_lock, flags);
 225
 226         return prop;
 227 }
 228
 229 /* Return the first property name for node 'node'. */
 230 /* buffer is unused argument, but as v9 uses it, we need to have the same interface */
 231 char * prom_firstprop(int node, char *bufer)
 232 {
 233         if (node == 0 || node == -1)
 234                 return "";
 235
 236         return __prom_nextprop(node, "");
 237 }
 238 EXPORT_SYMBOL(prom_firstprop);
 239
 240 /* Return the property type string after property type 'oprop'
 241  * at node 'node' .  Returns empty string if no more
 242  * property types for this node.
 243  */
 244 char * prom_nextprop(int node, char *oprop, char *buffer)
 245 {
 246         if (node == 0 || node == -1)
 247                 return "";
 248
 249         return __prom_nextprop(node, oprop);
 250 }
 251 EXPORT_SYMBOL(prom_nextprop);
 252
 253 int prom_finddevice(char *name)
 254 {
 255         char nbuf[128];
 256         char *s = name, *d;
 257         int node = prom_root_node, node2;
 258         unsigned int which_io, phys_addr;
 259         struct linux_prom_registers reg[PROMREG_MAX];
 260
 261         while (*s++) {
 262                 if (!*s) return node; /* path '.../' is legal */
 263                 node = prom_getchild(node);
 264
 265                 for (d = nbuf; *s != 0 && *s != '@' && *s != '/';)
 266                         *d++ = *s++;
 267                 *d = 0;
 268
 269                 node = prom_searchsiblings(node, nbuf);
 270                 if (!node)
 271                         return 0;
 272
 273                 if (*s == '@') {
 274                         if (isxdigit(s[1]) && s[2] == ',') {
 275                                 which_io = simple_strtoul(s+1, NULL, 16);
 276                                 phys_addr = simple_strtoul(s+3, &d, 16);
 277                                 if (d != s + 3 && (!*d || *d == '/')
 278                                     && d <= s + 3 + 8) {
 279                                         node2 = node;
 280                                         while (node2 && node2 != -1) {
 281                                                 if (prom_getproperty (node2, "reg", (char *)reg, sizeof (reg)) > 0) {
 282                                                         if (which_io == reg[0].which_io && phys_addr == reg[0].phys_addr) {
 283                                                                 node = node2;
 284                                                                 break;
 285                                                         }
 286                                                 }
 287                                                 node2 = prom_getsibling(node2);
 288                                                 if (!node2 || node2 == -1)
 289                                                         break;
 290                                                 node2 = prom_searchsiblings(prom_getsibling(node2), nbuf);
 291                                         }
 292                                 }
 293                         }
 294                         while (*s != 0 && *s != '/') s++;
 295                 }
 296         }
 297         return node;
 298 }
 299 EXPORT_SYMBOL(prom_finddevice);
 300
 301 int prom_node_has_property(int node, char *prop)
 302 {
 303         char *current_property = "";
 304
 305         do {
 306                 current_property = prom_nextprop(node, current_property, NULL);
 307                 if(!strcmp(current_property, prop))
 308                    return 1;
 309         } while (*current_property);
 310         return 0;
 311 }
 312 EXPORT_SYMBOL(prom_node_has_property);
 313
 314 /* Set property 'pname' at node 'node' to value 'value' which has a length
 315  * of 'size' bytes.  Return the number of bytes the prom accepted.
 316  */
 317 int prom_setprop(int node, const char *pname, char *value, int size)
 318 {
 319         unsigned long flags;
 320         int ret;
 321
 322         if(size == 0) return 0;
 323         if((pname == 0) || (value == 0)) return 0;
 324         spin_lock_irqsave(&prom_lock, flags);
 325         ret = prom_nodeops->no_setprop(node, pname, value, size);
 326         restore_current();
 327         spin_unlock_irqrestore(&prom_lock, flags);
 328         return ret;
 329 }
 330 EXPORT_SYMBOL(prom_setprop);
 331
 332 int prom_inst2pkg(int inst)
 333 {
 334         int node;
 335         unsigned long flags;
 336
 337         spin_lock_irqsave(&prom_lock, flags);
 338         node = (*romvec->pv_v2devops.v2_inst2pkg)(inst);
 339         restore_current();
 340         spin_unlock_irqrestore(&prom_lock, flags);
 341         if (node == -1) return 0;
 342         return node;
 343 }
 344
 345 /* Return 'node' assigned to a particular prom 'path'
 346  * FIXME: Should work for v0 as well
 347  */
 348 int prom_pathtoinode(char *path)
 349 {
 350         int node, inst;
 351
 352         inst = prom_devopen (path);
 353         if (inst == -1) return 0;
 354         node = prom_inst2pkg (inst);
 355         prom_devclose (inst);
 356         if (node == -1) return 0;
 357         return node;
 358 }