+++ /dev/null
-/*
- * tree.c: Basic device tree traversal/scanning for the Linux
- * prom library.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- */
-
-#define PROMLIB_INTERNAL
-
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/ctype.h>
-
-#include <asm/openprom.h>
-#include <asm/oplib.h>
-
-extern void restore_current(void);
-
-static char promlib_buf[128];
-
-/* Internal version of prom_getchild that does not alter return values. */
-int __prom_getchild(int node)
-{
- unsigned long flags;
- int cnode;
-
- spin_lock_irqsave(&prom_lock, flags);
- cnode = prom_nodeops->no_child(node);
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
-
- return cnode;
-}
-
-/* Return the child of node 'node' or zero if no this node has no
- * direct descendent.
- */
-int prom_getchild(int node)
-{
- int cnode;
-
- if (node == -1)
- return 0;
-
- cnode = __prom_getchild(node);
- if (cnode == 0 || cnode == -1)
- return 0;
-
- return cnode;
-}
-
-/* Internal version of prom_getsibling that does not alter return values. */
-int __prom_getsibling(int node)
-{
- unsigned long flags;
- int cnode;
-
- spin_lock_irqsave(&prom_lock, flags);
- cnode = prom_nodeops->no_nextnode(node);
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
-
- return cnode;
-}
-
-/* Return the next sibling of node 'node' or zero if no more siblings
- * at this level of depth in the tree.
- */
-int prom_getsibling(int node)
-{
- int sibnode;
-
- if (node == -1)
- return 0;
-
- sibnode = __prom_getsibling(node);
- if (sibnode == 0 || sibnode == -1)
- return 0;
-
- return sibnode;
-}
-
-/* Return the length in bytes of property 'prop' at node 'node'.
- * Return -1 on error.
- */
-int prom_getproplen(int node, char *prop)
-{
- int ret;
- unsigned long flags;
-
- if((!node) || (!prop))
- return -1;
-
- spin_lock_irqsave(&prom_lock, flags);
- ret = prom_nodeops->no_proplen(node, prop);
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
- return ret;
-}
-
-/* Acquire a property 'prop' at node 'node' and place it in
- * 'buffer' which has a size of 'bufsize'. If the acquisition
- * was successful the length will be returned, else -1 is returned.
- */
-int prom_getproperty(int node, char *prop, char *buffer, int bufsize)
-{
- int plen, ret;
- unsigned long flags;
-
- plen = prom_getproplen(node, prop);
- if((plen > bufsize) || (plen == 0) || (plen == -1))
- return -1;
- /* Ok, things seem all right. */
- spin_lock_irqsave(&prom_lock, flags);
- ret = prom_nodeops->no_getprop(node, prop, buffer);
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
- return ret;
-}
-
-/* Acquire an integer property and return its value. Returns -1
- * on failure.
- */
-int prom_getint(int node, char *prop)
-{
- static int intprop;
-
- if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
- return intprop;
-
- return -1;
-}
-
-/* Acquire an integer property, upon error return the passed default
- * integer.
- */
-int prom_getintdefault(int node, char *property, int deflt)
-{
- int retval;
-
- retval = prom_getint(node, property);
- if(retval == -1) return deflt;
-
- return retval;
-}
-
-/* Acquire a boolean property, 1=TRUE 0=FALSE. */
-int prom_getbool(int node, char *prop)
-{
- int retval;
-
- retval = prom_getproplen(node, prop);
- if(retval == -1) return 0;
- return 1;
-}
-
-/* Acquire a property whose value is a string, returns a null
- * string on error. The char pointer is the user supplied string
- * buffer.
- */
-void prom_getstring(int node, char *prop, char *user_buf, int ubuf_size)
-{
- int len;
-
- len = prom_getproperty(node, prop, user_buf, ubuf_size);
- if(len != -1) return;
- user_buf[0] = 0;
- return;
-}
-
-
-/* Does the device at node 'node' have name 'name'?
- * YES = 1 NO = 0
- */
-int prom_nodematch(int node, char *name)
-{
- int error;
-
- static char namebuf[128];
- error = prom_getproperty(node, "name", namebuf, sizeof(namebuf));
- if (error == -1) return 0;
- if(strcmp(namebuf, name) == 0) return 1;
- return 0;
-}
-
-/* Search siblings at 'node_start' for a node with name
- * 'nodename'. Return node if successful, zero if not.
- */
-int prom_searchsiblings(int node_start, char *nodename)
-{
-
- int thisnode, error;
-
- for(thisnode = node_start; thisnode;
- thisnode=prom_getsibling(thisnode)) {
- error = prom_getproperty(thisnode, "name", promlib_buf,
- sizeof(promlib_buf));
- /* Should this ever happen? */
- if(error == -1) continue;
- if(strcmp(nodename, promlib_buf)==0) return thisnode;
- }
-
- return 0;
-}
-
-/* Interal version of nextprop that does not alter return values. */
-char * __prom_nextprop(int node, char * oprop)
-{
- unsigned long flags;
- char *prop;
-
- spin_lock_irqsave(&prom_lock, flags);
- prop = prom_nodeops->no_nextprop(node, oprop);
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
-
- return prop;
-}
-
-/* Return the first property name for node 'node'. */
-/* buffer is unused argument, but as v9 uses it, we need to have the same interface */
-char * prom_firstprop(int node, char *bufer)
-{
- if (node == 0 || node == -1)
- return "";
-
- return __prom_nextprop(node, "");
-}
-
-/* Return the property type string after property type 'oprop'
- * at node 'node' . Returns empty string if no more
- * property types for this node.
- */
-char * prom_nextprop(int node, char *oprop, char *buffer)
-{
- if (node == 0 || node == -1)
- return "";
-
- return __prom_nextprop(node, oprop);
-}
-
-int prom_finddevice(char *name)
-{
- char nbuf[128];
- char *s = name, *d;
- int node = prom_root_node, node2;
- unsigned int which_io, phys_addr;
- struct linux_prom_registers reg[PROMREG_MAX];
-
- while (*s++) {
- if (!*s) return node; /* path '.../' is legal */
- node = prom_getchild(node);
-
- for (d = nbuf; *s != 0 && *s != '@' && *s != '/';)
- *d++ = *s++;
- *d = 0;
-
- node = prom_searchsiblings(node, nbuf);
- if (!node)
- return 0;
-
- if (*s == '@') {
- if (isxdigit(s[1]) && s[2] == ',') {
- which_io = simple_strtoul(s+1, NULL, 16);
- phys_addr = simple_strtoul(s+3, &d, 16);
- if (d != s + 3 && (!*d || *d == '/')
- && d <= s + 3 + 8) {
- node2 = node;
- while (node2 && node2 != -1) {
- if (prom_getproperty (node2, "reg", (char *)reg, sizeof (reg)) > 0) {
- if (which_io == reg[0].which_io && phys_addr == reg[0].phys_addr) {
- node = node2;
- break;
- }
- }
- node2 = prom_getsibling(node2);
- if (!node2 || node2 == -1)
- break;
- node2 = prom_searchsiblings(prom_getsibling(node2), nbuf);
- }
- }
- }
- while (*s != 0 && *s != '/') s++;
- }
- }
- return node;
-}
-
-int prom_node_has_property(int node, char *prop)
-{
- char *current_property = "";
-
- do {
- current_property = prom_nextprop(node, current_property, NULL);
- if(!strcmp(current_property, prop))
- return 1;
- } while (*current_property);
- return 0;
-}
-
-/* Set property 'pname' at node 'node' to value 'value' which has a length
- * of 'size' bytes. Return the number of bytes the prom accepted.
- */
-int prom_setprop(int node, char *pname, char *value, int size)
-{
- unsigned long flags;
- int ret;
-
- if(size == 0) return 0;
- if((pname == 0) || (value == 0)) return 0;
- spin_lock_irqsave(&prom_lock, flags);
- ret = prom_nodeops->no_setprop(node, pname, value, size);
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
- return ret;
-}
-
-int prom_inst2pkg(int inst)
-{
- int node;
- unsigned long flags;
-
- spin_lock_irqsave(&prom_lock, flags);
- node = (*romvec->pv_v2devops.v2_inst2pkg)(inst);
- restore_current();
- spin_unlock_irqrestore(&prom_lock, flags);
- if (node == -1) return 0;
- return node;
-}
-
-/* Return 'node' assigned to a particular prom 'path'
- * FIXME: Should work for v0 as well
- */
-int prom_pathtoinode(char *path)
-{
- int node, inst;
-
- inst = prom_devopen (path);
- if (inst == -1) return 0;
- node = prom_inst2pkg (inst);
- prom_devclose (inst);
- if (node == -1) return 0;
- return node;
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff