1 files changed, 364 insertions, 0 deletions
diff --git a/arch/sparc/prom/tree.c b/arch/sparc/prom/tree.c
new file mode 100644
index 00000000000..2bf03ee8cde
--- /dev/null
+++ b/arch/sparc/prom/tree.c
@@ -0,0 +1,364 @@
+/* $Id: tree.c,v 1.26 2000/08/26 02:38:03 anton Exp $
+ * 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;
+}
+
+/* Gets name in the form prom v2+ uses it (name@x,yyyyy or name (if no reg)) */
+int prom_getname (int node, char *buffer, int len)
+{
+	int i;
+	struct linux_prom_registers reg[PROMREG_MAX];
+	
+	i = prom_getproperty (node, "name", buffer, len);
+	if (i <= 0) return -1;
+	buffer [i] = 0;
+	len -= i;
+	i = prom_getproperty (node, "reg", (char *)reg, sizeof (reg));
+	if (i <= 0) return 0;
+	if (len < 11) return -1;
+	buffer = strchr (buffer, 0);
+	sprintf (buffer, "@%x,%x", reg[0].which_io, (uint)reg[0].phys_addr);
+	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;
+}