summaryrefslogtreecommitdiffstats
path: root/kernel/arch/sparc/prom/tree_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/arch/sparc/prom/tree_32.c')
-rw-r--r--kernel/arch/sparc/prom/tree_32.c309
1 files changed, 309 insertions, 0 deletions
diff --git a/kernel/arch/sparc/prom/tree_32.c b/kernel/arch/sparc/prom/tree_32.c
new file mode 100644
index 000000000..f30e8d038
--- /dev/null
+++ b/kernel/arch/sparc/prom/tree_32.c
@@ -0,0 +1,309 @@
+/*
+ * tree.c: Basic device tree traversal/scanning for the Linux
+ * prom library.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/ctype.h>
+#include <linux/module.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. */
+static phandle __prom_getchild(phandle node)
+{
+ unsigned long flags;
+ phandle 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.
+ */
+phandle prom_getchild(phandle node)
+{
+ phandle cnode;
+
+ if ((s32)node == -1)
+ return 0;
+
+ cnode = __prom_getchild(node);
+ if (cnode == 0 || (s32)cnode == -1)
+ return 0;
+
+ return cnode;
+}
+EXPORT_SYMBOL(prom_getchild);
+
+/* Internal version of prom_getsibling that does not alter return values. */
+static phandle __prom_getsibling(phandle node)
+{
+ unsigned long flags;
+ phandle 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.
+ */
+phandle prom_getsibling(phandle node)
+{
+ phandle sibnode;
+
+ if ((s32)node == -1)
+ return 0;
+
+ sibnode = __prom_getsibling(node);
+ if (sibnode == 0 || (s32)sibnode == -1)
+ return 0;
+
+ return sibnode;
+}
+EXPORT_SYMBOL(prom_getsibling);
+
+/* Return the length in bytes of property 'prop' at node 'node'.
+ * Return -1 on error.
+ */
+int prom_getproplen(phandle node, const 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;
+}
+EXPORT_SYMBOL(prom_getproplen);
+
+/* 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(phandle node, const 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;
+}
+EXPORT_SYMBOL(prom_getproperty);
+
+/* Acquire an integer property and return its value. Returns -1
+ * on failure.
+ */
+int prom_getint(phandle node, char *prop)
+{
+ static int intprop;
+
+ if(prom_getproperty(node, prop, (char *) &intprop, sizeof(int)) != -1)
+ return intprop;
+
+ return -1;
+}
+EXPORT_SYMBOL(prom_getint);
+
+/* Acquire an integer property, upon error return the passed default
+ * integer.
+ */
+int prom_getintdefault(phandle node, char *property, int deflt)
+{
+ int retval;
+
+ retval = prom_getint(node, property);
+ if(retval == -1) return deflt;
+
+ return retval;
+}
+EXPORT_SYMBOL(prom_getintdefault);
+
+/* Acquire a boolean property, 1=TRUE 0=FALSE. */
+int prom_getbool(phandle node, char *prop)
+{
+ int retval;
+
+ retval = prom_getproplen(node, prop);
+ if(retval == -1) return 0;
+ return 1;
+}
+EXPORT_SYMBOL(prom_getbool);
+
+/* 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(phandle 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;
+}
+EXPORT_SYMBOL(prom_getstring);
+
+
+/* Search siblings at 'node_start' for a node with name
+ * 'nodename'. Return node if successful, zero if not.
+ */
+phandle prom_searchsiblings(phandle node_start, char *nodename)
+{
+
+ phandle thisnode;
+ int 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;
+}
+EXPORT_SYMBOL(prom_searchsiblings);
+
+/* Interal version of nextprop that does not alter return values. */
+static char *__prom_nextprop(phandle 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 property type string after property type 'oprop'
+ * at node 'node' . Returns empty string if no more
+ * property types for this node.
+ */
+char *prom_nextprop(phandle node, char *oprop, char *buffer)
+{
+ if (node == 0 || (s32)node == -1)
+ return "";
+
+ return __prom_nextprop(node, oprop);
+}
+EXPORT_SYMBOL(prom_nextprop);
+
+phandle prom_finddevice(char *name)
+{
+ char nbuf[128];
+ char *s = name, *d;
+ phandle 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 && (s32)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 || (s32)node2 == -1)
+ break;
+ node2 = prom_searchsiblings(prom_getsibling(node2), nbuf);
+ }
+ }
+ }
+ while (*s != 0 && *s != '/') s++;
+ }
+ }
+ return node;
+}
+EXPORT_SYMBOL(prom_finddevice);
+
+/* 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(phandle node, const char *pname, char *value, int size)
+{
+ unsigned long flags;
+ int ret;
+
+ if (size == 0)
+ return 0;
+ if ((pname == NULL) || (value == NULL))
+ 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;
+}
+EXPORT_SYMBOL(prom_setprop);
+
+phandle prom_inst2pkg(int inst)
+{
+ phandle 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 ((s32)node == -1)
+ return 0;
+ return node;
+}