/* $Id: tree.c,v 1.10 1998/01/10 22:39:00 ecd Exp $
* tree.c: Basic device tree traversal/scanning for the Linux
* prom library.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/string.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
/* Return the child of node 'node' or zero if no this node has no
* direct descendent.
*/
__inline__ int
__prom_getchild(int node)
{
return p1275_cmd ("child", P1275_INOUT(1, 1), node);
}
__inline__ int
prom_getchild(int node)
{
int cnode;
if(node == -1) return 0;
cnode = __prom_getchild(node);
if(cnode == -1) return 0;
return (int)cnode;
}
__inline__ int
prom_getparent(int node)
{
int cnode;
if(node == -1) return 0;
cnode = p1275_cmd ("parent", P1275_INOUT(1, 1), node);
if(cnode == -1) return 0;
return (int)cnode;
}
/* Return the next sibling of node 'node' or zero if no more siblings
* at this level of depth in the tree.
*/
__inline__ int
__prom_getsibling(int node)
{
return p1275_cmd ("peer", P1275_INOUT(1, 1), node);
}
__inline__ int
prom_getsibling(int node)
{
int sibnode;
if(node == -1) return 0;
sibnode = __prom_getsibling(node);
if(sibnode == -1) return 0;
return sibnode;
}
/* Return the length in bytes of property 'prop' at node 'node'.
* Return -1 on error.
*/
__inline__ int
prom_getproplen(int node, const char *prop)
{
if((!node) || (!prop)) return -1;
return p1275_cmd ("getproplen",
P1275_ARG(1,P1275_ARG_IN_STRING)|
P1275_INOUT(2, 1),
node, prop);
}
/* 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.
*/
__inline__ int
prom_getproperty(int node, const char *prop, char *buffer, int bufsize)
{
int plen;
plen = prom_getproplen(node, prop);
if ((plen > bufsize) || (plen == 0) || (plen == -1)) {
return -1;
} else {
/* Ok, things seem all right. */
return p1275_cmd(prom_getprop_name,
P1275_ARG(1,P1275_ARG_IN_STRING)|
P1275_ARG(2,P1275_ARG_OUT_BUF)|
P1275_INOUT(4, 1),
node, prop, buffer, P1275_SIZE(plen));
}
}
/* Acquire an integer property and return its value. Returns -1
* on failure.
*/
__inline__ int
prom_getint(int node, const char *prop)
{
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, const 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, const 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, const 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, const char *name)
{
char namebuf[128];
prom_getproperty(node, "name", namebuf, sizeof(namebuf));
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, const char *nodename)
{
int thisnode, error;
char promlib_buf[128];
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 {name@x,yyyyy|name (if no reg)} form */
int
prom_getname (int node, char *buffer, int len)
{
int i, sbus = 0;
int pci = 0, ebus = 0, ide = 0;
struct linux_prom_registers *reg;
struct linux_prom64_registers reg64[PROMREG_MAX];
for (sbus = prom_getparent (node); sbus; sbus = prom_getparent (sbus)) {
i = prom_getproperty (sbus, "name", buffer, len);
if (i > 0) {
buffer [i] = 0;
if (!strcmp (buffer, "sbus"))
goto getit;
}
}
if ((pci = prom_getparent (node))) {
i = prom_getproperty (pci, "name", buffer, len);
if (i > 0) {
buffer [i] = 0;
if (!strcmp (buffer, "pci"))
goto getit;
}
pci = 0;
}
if ((ebus = prom_getparent (node))) {
i = prom_getproperty (ebus, "name", buffer, len);
if (i > 0) {
buffer[i] = 0;
if (!strcmp (buffer, "ebus"))
goto getit;
}
ebus = 0;
}
if ((ide = prom_getparent (node))) {
i = prom_getproperty (ide, "name", buffer, len);
if (i > 0) {
buffer [i] = 0;
if (!strcmp (buffer, "ide"))
goto getit;
}
ide = 0;
}
getit:
i = prom_getproperty (node, "name", buffer, len);
if (i <= 0) {
buffer [0] = 0;
return -1;
}
buffer [i] = 0;
len -= i;
i = prom_getproperty (node, "reg", (char *)reg64, sizeof (reg64));
if (i <= 0) return 0;
if (len < 16) return -1;
buffer = strchr (buffer, 0);
if (sbus) {
reg = (struct linux_prom_registers *)reg64;
sprintf (buffer, "@%x,%x", reg[0].which_io, (uint)reg[0].phys_addr);
} else if (pci) {
int dev, fn;
reg = (struct linux_prom_registers *)reg64;
fn = (reg[0].which_io >> 8) & 0x07;
dev = (reg[0].which_io >> 11) & 0x1f;
if (fn)
sprintf (buffer, "@%x,%x", dev, fn);
else
sprintf (buffer, "@%x", dev);
} else if (ebus) {
reg = (struct linux_prom_registers *)reg64;
sprintf (buffer, "@%x,%x", reg[0].which_io, reg[0].phys_addr);
} else if (ide) {
reg = (struct linux_prom_registers *)reg64;
sprintf (buffer, "@%x,%x", reg[0].which_io, reg[0].phys_addr);
} else if (i == 4) { /* Happens on 8042's children on Ultra/PCI. */
reg = (struct linux_prom_registers *)reg64;
sprintf (buffer, "@%x", reg[0].which_io);
} else {
sprintf (buffer, "@%x,%x",
(unsigned int)(reg64[0].phys_addr >> 36),
(unsigned int)(reg64[0].phys_addr));
}
return 0;
}
/* Return the first property type for node 'node'.
* buffer should be at least 32B in length
*/
__inline__ char *
prom_firstprop(int node, char *buffer)
{
*buffer = 0;
if(node == -1) return buffer;
p1275_cmd ("nextprop", P1275_ARG(2,P1275_ARG_OUT_32B)|
P1275_INOUT(3, 0),
node, (char *) 0x0, buffer);
return buffer;
}
/* Return the property type string after property type 'oprop'
* at node 'node' . Returns NULL string if no more
* property types for this node.
*/
__inline__ char *
prom_nextprop(int node, const char *oprop, char *buffer)
{
char buf[32];
if(node == -1) {
*buffer = 0;
return buffer;
}
if (oprop == buffer) {
strcpy (buf, oprop);
oprop = buf;
}
p1275_cmd ("nextprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
P1275_ARG(2,P1275_ARG_OUT_32B)|
P1275_INOUT(3, 0),
node, oprop, buffer);
return buffer;
}
int
prom_finddevice(const char *name)
{
if (!name)
return 0;
return p1275_cmd(prom_finddev_name,
P1275_ARG(0,P1275_ARG_IN_STRING)|
P1275_INOUT(1, 1),
name);
}
int prom_node_has_property(int node, const char *prop)
{
char buf [32];
*buf = 0;
do {
prom_nextprop(node, buf, buf);
if(!strcmp(buf, prop))
return 1;
} while (*buf);
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, const char *pname, char *value, int size)
{
if(size == 0) return 0;
if((pname == 0) || (value == 0)) return 0;
return p1275_cmd ("setprop", P1275_ARG(1,P1275_ARG_IN_STRING)|
P1275_ARG(2,P1275_ARG_IN_BUF)|
P1275_INOUT(4, 1),
node, pname, value, P1275_SIZE(size));
}
__inline__ int
prom_inst2pkg(int inst)
{
int node;
node = p1275_cmd ("instance-to-package", P1275_INOUT(1, 1), inst);
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(const char *path)
{
int node, inst;
inst = prom_devopen (path);
if (inst == 0) return 0;
node = prom_inst2pkg (inst);
prom_devclose (inst);
if (node == -1) return 0;
return node;
}
