651 lines
14 KiB
C
651 lines
14 KiB
C
/*
|
|
* Procedures for creating, accessing and interpreting the device tree.
|
|
*
|
|
* Paul Mackerras August 1996.
|
|
* Copyright (C) 1996-2005 Paul Mackerras.
|
|
*
|
|
* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
|
|
* {engebret|bergner}@us.ibm.com
|
|
*
|
|
* Adapted for sparc64 by David S. Miller davem@davemloft.net
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/oplib.h>
|
|
|
|
static struct device_node *allnodes;
|
|
|
|
int of_device_is_compatible(struct device_node *device, const char *compat)
|
|
{
|
|
const char* cp;
|
|
int cplen, l;
|
|
|
|
cp = (char *) of_get_property(device, "compatible", &cplen);
|
|
if (cp == NULL)
|
|
return 0;
|
|
while (cplen > 0) {
|
|
if (strncmp(cp, compat, strlen(compat)) == 0)
|
|
return 1;
|
|
l = strlen(cp) + 1;
|
|
cp += l;
|
|
cplen -= l;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(of_device_is_compatible);
|
|
|
|
struct device_node *of_get_parent(const struct device_node *node)
|
|
{
|
|
struct device_node *np;
|
|
|
|
if (!node)
|
|
return NULL;
|
|
|
|
np = node->parent;
|
|
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_get_parent);
|
|
|
|
struct device_node *of_get_next_child(const struct device_node *node,
|
|
struct device_node *prev)
|
|
{
|
|
struct device_node *next;
|
|
|
|
next = prev ? prev->sibling : node->child;
|
|
for (; next != 0; next = next->sibling) {
|
|
break;
|
|
}
|
|
|
|
return next;
|
|
}
|
|
EXPORT_SYMBOL(of_get_next_child);
|
|
|
|
struct device_node *of_find_node_by_path(const char *path)
|
|
{
|
|
struct device_node *np = allnodes;
|
|
|
|
for (; np != 0; np = np->allnext) {
|
|
if (np->full_name != 0 && strcmp(np->full_name, path) == 0)
|
|
break;
|
|
}
|
|
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_path);
|
|
|
|
struct device_node *of_find_node_by_phandle(phandle handle)
|
|
{
|
|
struct device_node *np;
|
|
|
|
for (np = allnodes; np != 0; np = np->allnext)
|
|
if (np->node == handle)
|
|
break;
|
|
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_phandle);
|
|
|
|
struct device_node *of_find_node_by_name(struct device_node *from,
|
|
const char *name)
|
|
{
|
|
struct device_node *np;
|
|
|
|
np = from ? from->allnext : allnodes;
|
|
for (; np != NULL; np = np->allnext)
|
|
if (np->name != NULL && strcmp(np->name, name) == 0)
|
|
break;
|
|
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_name);
|
|
|
|
struct device_node *of_find_node_by_type(struct device_node *from,
|
|
const char *type)
|
|
{
|
|
struct device_node *np;
|
|
|
|
np = from ? from->allnext : allnodes;
|
|
for (; np != 0; np = np->allnext)
|
|
if (np->type != 0 && strcmp(np->type, type) == 0)
|
|
break;
|
|
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_node_by_type);
|
|
|
|
struct device_node *of_find_compatible_node(struct device_node *from,
|
|
const char *type, const char *compatible)
|
|
{
|
|
struct device_node *np;
|
|
|
|
np = from ? from->allnext : allnodes;
|
|
for (; np != 0; np = np->allnext) {
|
|
if (type != NULL
|
|
&& !(np->type != 0 && strcmp(np->type, type) == 0))
|
|
continue;
|
|
if (of_device_is_compatible(np, compatible))
|
|
break;
|
|
}
|
|
|
|
return np;
|
|
}
|
|
EXPORT_SYMBOL(of_find_compatible_node);
|
|
|
|
struct property *of_find_property(struct device_node *np, const char *name,
|
|
int *lenp)
|
|
{
|
|
struct property *pp;
|
|
|
|
for (pp = np->properties; pp != 0; pp = pp->next) {
|
|
if (strcmp(pp->name, name) == 0) {
|
|
if (lenp != 0)
|
|
*lenp = pp->length;
|
|
break;
|
|
}
|
|
}
|
|
return pp;
|
|
}
|
|
EXPORT_SYMBOL(of_find_property);
|
|
|
|
/*
|
|
* Find a property with a given name for a given node
|
|
* and return the value.
|
|
*/
|
|
void *of_get_property(struct device_node *np, const char *name, int *lenp)
|
|
{
|
|
struct property *pp = of_find_property(np,name,lenp);
|
|
return pp ? pp->value : NULL;
|
|
}
|
|
EXPORT_SYMBOL(of_get_property);
|
|
|
|
int of_getintprop_default(struct device_node *np, const char *name, int def)
|
|
{
|
|
struct property *prop;
|
|
int len;
|
|
|
|
prop = of_find_property(np, name, &len);
|
|
if (!prop || len != 4)
|
|
return def;
|
|
|
|
return *(int *) prop->value;
|
|
}
|
|
EXPORT_SYMBOL(of_getintprop_default);
|
|
|
|
static unsigned int prom_early_allocated;
|
|
|
|
static void * __init prom_early_alloc(unsigned long size)
|
|
{
|
|
void *ret;
|
|
|
|
ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
|
|
if (ret != NULL)
|
|
memset(ret, 0, size);
|
|
|
|
prom_early_allocated += size;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int is_root_node(const struct device_node *dp)
|
|
{
|
|
if (!dp)
|
|
return 0;
|
|
|
|
return (dp->parent == NULL);
|
|
}
|
|
|
|
/* The following routines deal with the black magic of fully naming a
|
|
* node.
|
|
*
|
|
* Certain well known named nodes are just the simple name string.
|
|
*
|
|
* Actual devices have an address specifier appended to the base name
|
|
* string, like this "foo@addr". The "addr" can be in any number of
|
|
* formats, and the platform plus the type of the node determine the
|
|
* format and how it is constructed.
|
|
*
|
|
* For children of the ROOT node, the naming convention is fixed and
|
|
* determined by whether this is a sun4u or sun4v system.
|
|
*
|
|
* For children of other nodes, it is bus type specific. So
|
|
* we walk up the tree until we discover a "device_type" property
|
|
* we recognize and we go from there.
|
|
*
|
|
* As an example, the boot device on my workstation has a full path:
|
|
*
|
|
* /pci@1e,600000/ide@d/disk@0,0:c
|
|
*/
|
|
static void __init sun4v_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct linux_prom64_registers *regs;
|
|
struct property *rprop;
|
|
u32 high_bits, low_bits, type;
|
|
|
|
rprop = of_find_property(dp, "reg", NULL);
|
|
if (!rprop)
|
|
return;
|
|
|
|
regs = rprop->value;
|
|
if (!is_root_node(dp->parent)) {
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name,
|
|
(unsigned int) (regs->phys_addr >> 32UL),
|
|
(unsigned int) (regs->phys_addr & 0xffffffffUL));
|
|
return;
|
|
}
|
|
|
|
type = regs->phys_addr >> 60UL;
|
|
high_bits = (regs->phys_addr >> 32UL) & 0x0fffffffUL;
|
|
low_bits = (regs->phys_addr & 0xffffffffUL);
|
|
|
|
if (type == 0 || type == 8) {
|
|
const char *prefix = (type == 0) ? "m" : "i";
|
|
|
|
if (low_bits)
|
|
sprintf(tmp_buf, "%s@%s%x,%x",
|
|
dp->name, prefix,
|
|
high_bits, low_bits);
|
|
else
|
|
sprintf(tmp_buf, "%s@%s%x",
|
|
dp->name,
|
|
prefix,
|
|
high_bits);
|
|
} else if (type == 12) {
|
|
sprintf(tmp_buf, "%s@%x",
|
|
dp->name, high_bits);
|
|
}
|
|
}
|
|
|
|
static void __init sun4u_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct linux_prom64_registers *regs;
|
|
struct property *prop;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
if (!is_root_node(dp->parent)) {
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name,
|
|
(unsigned int) (regs->phys_addr >> 32UL),
|
|
(unsigned int) (regs->phys_addr & 0xffffffffUL));
|
|
return;
|
|
}
|
|
|
|
prop = of_find_property(dp, "upa-portid", NULL);
|
|
if (!prop)
|
|
prop = of_find_property(dp, "portid", NULL);
|
|
if (prop) {
|
|
unsigned long mask = 0xffffffffUL;
|
|
|
|
if (tlb_type >= cheetah)
|
|
mask = 0x7fffff;
|
|
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name,
|
|
*(u32 *)prop->value,
|
|
(unsigned int) (regs->phys_addr & mask));
|
|
}
|
|
}
|
|
|
|
/* "name@slot,offset" */
|
|
static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct linux_prom_registers *regs;
|
|
struct property *prop;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name,
|
|
regs->which_io,
|
|
regs->phys_addr);
|
|
}
|
|
|
|
/* "name@devnum[,func]" */
|
|
static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct linux_prom_pci_registers *regs;
|
|
struct property *prop;
|
|
unsigned int devfn;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
devfn = (regs->phys_hi >> 8) & 0xff;
|
|
if (devfn & 0x07) {
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name,
|
|
devfn >> 3,
|
|
devfn & 0x07);
|
|
} else {
|
|
sprintf(tmp_buf, "%s@%x",
|
|
dp->name,
|
|
devfn >> 3);
|
|
}
|
|
}
|
|
|
|
/* "name@UPA_PORTID,offset" */
|
|
static void __init upa_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct linux_prom64_registers *regs;
|
|
struct property *prop;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
|
|
prop = of_find_property(dp, "upa-portid", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name,
|
|
*(u32 *) prop->value,
|
|
(unsigned int) (regs->phys_addr & 0xffffffffUL));
|
|
}
|
|
|
|
/* "name@reg" */
|
|
static void __init vdev_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct property *prop;
|
|
u32 *regs;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
|
|
sprintf(tmp_buf, "%s@%x", dp->name, *regs);
|
|
}
|
|
|
|
/* "name@addrhi,addrlo" */
|
|
static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct linux_prom64_registers *regs;
|
|
struct property *prop;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name,
|
|
(unsigned int) (regs->phys_addr >> 32UL),
|
|
(unsigned int) (regs->phys_addr & 0xffffffffUL));
|
|
}
|
|
|
|
/* "name@bus,addr" */
|
|
static void __init i2c_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct property *prop;
|
|
u32 *regs;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
|
|
/* This actually isn't right... should look at the #address-cells
|
|
* property of the i2c bus node etc. etc.
|
|
*/
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name, regs[0], regs[1]);
|
|
}
|
|
|
|
/* "name@reg0[,reg1]" */
|
|
static void __init usb_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct property *prop;
|
|
u32 *regs;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
|
|
if (prop->length == sizeof(u32) || regs[1] == 1) {
|
|
sprintf(tmp_buf, "%s@%x",
|
|
dp->name, regs[0]);
|
|
} else {
|
|
sprintf(tmp_buf, "%s@%x,%x",
|
|
dp->name, regs[0], regs[1]);
|
|
}
|
|
}
|
|
|
|
/* "name@reg0reg1[,reg2reg3]" */
|
|
static void __init ieee1394_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct property *prop;
|
|
u32 *regs;
|
|
|
|
prop = of_find_property(dp, "reg", NULL);
|
|
if (!prop)
|
|
return;
|
|
|
|
regs = prop->value;
|
|
|
|
if (regs[2] || regs[3]) {
|
|
sprintf(tmp_buf, "%s@%08x%08x,%04x%08x",
|
|
dp->name, regs[0], regs[1], regs[2], regs[3]);
|
|
} else {
|
|
sprintf(tmp_buf, "%s@%08x%08x",
|
|
dp->name, regs[0], regs[1]);
|
|
}
|
|
}
|
|
|
|
static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
|
|
{
|
|
struct device_node *parent = dp->parent;
|
|
|
|
if (parent != NULL) {
|
|
if (!strcmp(parent->type, "pci") ||
|
|
!strcmp(parent->type, "pciex"))
|
|
return pci_path_component(dp, tmp_buf);
|
|
if (!strcmp(parent->type, "sbus"))
|
|
return sbus_path_component(dp, tmp_buf);
|
|
if (!strcmp(parent->type, "upa"))
|
|
return upa_path_component(dp, tmp_buf);
|
|
if (!strcmp(parent->type, "ebus"))
|
|
return ebus_path_component(dp, tmp_buf);
|
|
if (!strcmp(parent->name, "usb") ||
|
|
!strcmp(parent->name, "hub"))
|
|
return usb_path_component(dp, tmp_buf);
|
|
if (!strcmp(parent->type, "i2c"))
|
|
return i2c_path_component(dp, tmp_buf);
|
|
if (!strcmp(parent->type, "firewire"))
|
|
return ieee1394_path_component(dp, tmp_buf);
|
|
if (!strcmp(parent->type, "virtual-devices"))
|
|
return vdev_path_component(dp, tmp_buf);
|
|
|
|
/* "isa" is handled with platform naming */
|
|
}
|
|
|
|
/* Use platform naming convention. */
|
|
if (tlb_type == hypervisor)
|
|
return sun4v_path_component(dp, tmp_buf);
|
|
else
|
|
return sun4u_path_component(dp, tmp_buf);
|
|
}
|
|
|
|
static char * __init build_path_component(struct device_node *dp)
|
|
{
|
|
char tmp_buf[64], *n;
|
|
|
|
tmp_buf[0] = '\0';
|
|
__build_path_component(dp, tmp_buf);
|
|
if (tmp_buf[0] == '\0')
|
|
strcpy(tmp_buf, dp->name);
|
|
|
|
n = prom_early_alloc(strlen(tmp_buf) + 1);
|
|
strcpy(n, tmp_buf);
|
|
|
|
return n;
|
|
}
|
|
|
|
static char * __init build_full_name(struct device_node *dp)
|
|
{
|
|
int len, ourlen, plen;
|
|
char *n;
|
|
|
|
plen = strlen(dp->parent->full_name);
|
|
ourlen = strlen(dp->path_component_name);
|
|
len = ourlen + plen + 2;
|
|
|
|
n = prom_early_alloc(len);
|
|
strcpy(n, dp->parent->full_name);
|
|
if (!is_root_node(dp->parent)) {
|
|
strcpy(n + plen, "/");
|
|
plen++;
|
|
}
|
|
strcpy(n + plen, dp->path_component_name);
|
|
|
|
return n;
|
|
}
|
|
|
|
static struct property * __init build_one_prop(phandle node, char *prev)
|
|
{
|
|
static struct property *tmp = NULL;
|
|
struct property *p;
|
|
|
|
if (tmp) {
|
|
p = tmp;
|
|
memset(p, 0, sizeof(*p) + 32);
|
|
tmp = NULL;
|
|
} else
|
|
p = prom_early_alloc(sizeof(struct property) + 32);
|
|
|
|
p->name = (char *) (p + 1);
|
|
if (prev == NULL) {
|
|
prom_firstprop(node, p->name);
|
|
} else {
|
|
prom_nextprop(node, prev, p->name);
|
|
}
|
|
if (strlen(p->name) == 0) {
|
|
tmp = p;
|
|
return NULL;
|
|
}
|
|
p->length = prom_getproplen(node, p->name);
|
|
if (p->length <= 0) {
|
|
p->length = 0;
|
|
} else {
|
|
p->value = prom_early_alloc(p->length);
|
|
prom_getproperty(node, p->name, p->value, p->length);
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static struct property * __init build_prop_list(phandle node)
|
|
{
|
|
struct property *head, *tail;
|
|
|
|
head = tail = build_one_prop(node, NULL);
|
|
while(tail) {
|
|
tail->next = build_one_prop(node, tail->name);
|
|
tail = tail->next;
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
static char * __init get_one_property(phandle node, const char *name)
|
|
{
|
|
char *buf = "<NULL>";
|
|
int len;
|
|
|
|
len = prom_getproplen(node, name);
|
|
if (len > 0) {
|
|
buf = prom_early_alloc(len);
|
|
prom_getproperty(node, name, buf, len);
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
static struct device_node * __init create_node(phandle node)
|
|
{
|
|
struct device_node *dp;
|
|
|
|
if (!node)
|
|
return NULL;
|
|
|
|
dp = prom_early_alloc(sizeof(*dp));
|
|
|
|
kref_init(&dp->kref);
|
|
|
|
dp->name = get_one_property(node, "name");
|
|
dp->type = get_one_property(node, "device_type");
|
|
dp->node = node;
|
|
|
|
/* Build interrupts later... */
|
|
|
|
dp->properties = build_prop_list(node);
|
|
|
|
return dp;
|
|
}
|
|
|
|
static struct device_node * __init build_tree(struct device_node *parent, phandle node, struct device_node ***nextp)
|
|
{
|
|
struct device_node *dp;
|
|
|
|
dp = create_node(node);
|
|
if (dp) {
|
|
*(*nextp) = dp;
|
|
*nextp = &dp->allnext;
|
|
|
|
dp->parent = parent;
|
|
dp->path_component_name = build_path_component(dp);
|
|
dp->full_name = build_full_name(dp);
|
|
|
|
dp->child = build_tree(dp, prom_getchild(node), nextp);
|
|
|
|
dp->sibling = build_tree(parent, prom_getsibling(node), nextp);
|
|
}
|
|
|
|
return dp;
|
|
}
|
|
|
|
void __init prom_build_devicetree(void)
|
|
{
|
|
struct device_node **nextp;
|
|
|
|
allnodes = create_node(prom_root_node);
|
|
allnodes->path_component_name = "";
|
|
allnodes->full_name = "/";
|
|
|
|
nextp = &allnodes->allnext;
|
|
allnodes->child = build_tree(allnodes,
|
|
prom_getchild(allnodes->node),
|
|
&nextp);
|
|
printk("PROM: Built device tree with %u bytes of memory.\n",
|
|
prom_early_allocated);
|
|
}
|