2 * Procedures for creating, accessing and interpreting the device tree.
4 * Paul Mackerras August 1996.
5 * Copyright (C) 1996-2005 Paul Mackerras.
7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8 * {engebret|bergner}@us.ibm.com
10 * Adapted for sparc32 by David S. Miller davem@davemloft.net
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
18 #include <linux/kernel.h>
19 #include <linux/types.h>
20 #include <linux/string.h>
22 #include <linux/bootmem.h>
23 #include <linux/module.h>
26 #include <asm/oplib.h>
30 static unsigned int prom_early_allocated
;
32 void * __init
prom_early_alloc(unsigned long size
)
36 ret
= __alloc_bootmem(size
, SMP_CACHE_BYTES
, 0UL);
40 prom_early_allocated
+= size
;
45 static int is_root_node(const struct device_node
*dp
)
50 return (dp
->parent
== NULL
);
53 /* The following routines deal with the black magic of fully naming a
56 * Certain well known named nodes are just the simple name string.
58 * Actual devices have an address specifier appended to the base name
59 * string, like this "foo@addr". The "addr" can be in any number of
60 * formats, and the platform plus the type of the node determine the
61 * format and how it is constructed.
63 * For children of the ROOT node, the naming convention is fixed and
64 * determined by whether this is a sun4u or sun4v system.
66 * For children of other nodes, it is bus type specific. So
67 * we walk up the tree until we discover a "device_type" property
68 * we recognize and we go from there.
70 static void __init
sparc32_path_component(struct device_node
*dp
, char *tmp_buf
)
72 struct linux_prom_registers
*regs
;
73 struct property
*rprop
;
75 rprop
= of_find_property(dp
, "reg", NULL
);
80 sprintf(tmp_buf
, "%s@%x,%x",
82 regs
->which_io
, regs
->phys_addr
);
85 /* "name@slot,offset" */
86 static void __init
sbus_path_component(struct device_node
*dp
, char *tmp_buf
)
88 struct linux_prom_registers
*regs
;
89 struct property
*prop
;
91 prop
= of_find_property(dp
, "reg", NULL
);
96 sprintf(tmp_buf
, "%s@%x,%x",
102 /* "name@devnum[,func]" */
103 static void __init
pci_path_component(struct device_node
*dp
, char *tmp_buf
)
105 struct linux_prom_pci_registers
*regs
;
106 struct property
*prop
;
109 prop
= of_find_property(dp
, "reg", NULL
);
114 devfn
= (regs
->phys_hi
>> 8) & 0xff;
116 sprintf(tmp_buf
, "%s@%x,%x",
121 sprintf(tmp_buf
, "%s@%x",
127 /* "name@addrhi,addrlo" */
128 static void __init
ebus_path_component(struct device_node
*dp
, char *tmp_buf
)
130 struct linux_prom_registers
*regs
;
131 struct property
*prop
;
133 prop
= of_find_property(dp
, "reg", NULL
);
139 sprintf(tmp_buf
, "%s@%x,%x",
141 regs
->which_io
, regs
->phys_addr
);
144 static void __init
__build_path_component(struct device_node
*dp
, char *tmp_buf
)
146 struct device_node
*parent
= dp
->parent
;
148 if (parent
!= NULL
) {
149 if (!strcmp(parent
->type
, "pci") ||
150 !strcmp(parent
->type
, "pciex"))
151 return pci_path_component(dp
, tmp_buf
);
152 if (!strcmp(parent
->type
, "sbus"))
153 return sbus_path_component(dp
, tmp_buf
);
154 if (!strcmp(parent
->type
, "ebus"))
155 return ebus_path_component(dp
, tmp_buf
);
157 /* "isa" is handled with platform naming */
160 /* Use platform naming convention. */
161 return sparc32_path_component(dp
, tmp_buf
);
164 static char * __init
build_path_component(struct device_node
*dp
)
166 char tmp_buf
[64], *n
;
169 __build_path_component(dp
, tmp_buf
);
170 if (tmp_buf
[0] == '\0')
171 strcpy(tmp_buf
, dp
->name
);
173 n
= prom_early_alloc(strlen(tmp_buf
) + 1);
179 static char * __init
build_full_name(struct device_node
*dp
)
181 int len
, ourlen
, plen
;
184 plen
= strlen(dp
->parent
->full_name
);
185 ourlen
= strlen(dp
->path_component_name
);
186 len
= ourlen
+ plen
+ 2;
188 n
= prom_early_alloc(len
);
189 strcpy(n
, dp
->parent
->full_name
);
190 if (!is_root_node(dp
->parent
)) {
191 strcpy(n
+ plen
, "/");
194 strcpy(n
+ plen
, dp
->path_component_name
);
199 static struct device_node
* __init
build_tree(struct device_node
*parent
, phandle node
, struct device_node
***nextp
)
201 struct device_node
*dp
;
203 dp
= create_node(node
, parent
);
206 *nextp
= &dp
->allnext
;
209 dp
->path_component_name
= build_path_component(dp
);
210 dp
->full_name
= build_full_name(dp
);
212 dp
->child
= build_tree(dp
, prom_getchild(node
), nextp
);
214 dp
->sibling
= build_tree(parent
, prom_getsibling(node
), nextp
);
220 struct device_node
*of_console_device
;
221 EXPORT_SYMBOL(of_console_device
);
223 char *of_console_path
;
224 EXPORT_SYMBOL(of_console_path
);
226 char *of_console_options
;
227 EXPORT_SYMBOL(of_console_options
);
229 extern void restore_current(void);
231 static void __init
of_console_init(void)
233 char *msg
= "OF stdout device is: %s\n";
234 struct device_node
*dp
;
240 of_console_path
= prom_early_alloc(256);
245 switch (*romvec
->pv_stdout
) {
259 prom_printf("Invalid PROM_V0 stdout value %u\n",
265 for_each_node_by_type(dp
, type
) {
270 prom_printf("Cannot find PROM_V0 console node.\n");
273 of_console_device
= dp
;
275 strcpy(of_console_path
, dp
->full_name
);
276 if (!strcmp(type
, "serial")) {
277 strcat(of_console_path
,
278 (skip
? ":b" : ":a"));
285 fd
= *romvec
->pv_v2bootargs
.fd_stdout
;
287 spin_lock_irqsave(&prom_lock
, flags
);
288 node
= (*romvec
->pv_v2devops
.v2_inst2pkg
)(fd
);
290 spin_unlock_irqrestore(&prom_lock
, flags
);
293 prom_printf("Cannot resolve stdout node from "
294 "instance %08x.\n", fd
);
297 dp
= of_find_node_by_phandle(node
);
298 type
= of_get_property(dp
, "device_type", NULL
);
301 prom_printf("Console stdout lacks "
302 "device_type property.\n");
306 if (strcmp(type
, "display") && strcmp(type
, "serial")) {
307 prom_printf("Console device_type is neither display "
312 of_console_device
= dp
;
314 if (prom_vers
== PROM_V2
) {
315 strcpy(of_console_path
, dp
->full_name
);
316 switch (*romvec
->pv_stdout
) {
318 strcat(of_console_path
, ":a");
321 strcat(of_console_path
, ":b");
327 dp
= of_find_node_by_path("/");
328 path
= of_get_property(dp
, "stdout-path", NULL
);
330 prom_printf("No stdout-path in root node.\n");
333 strcpy(of_console_path
, path
);
338 of_console_options
= strrchr(of_console_path
, ':');
339 if (of_console_options
) {
340 of_console_options
++;
341 if (*of_console_options
== '\0')
342 of_console_options
= NULL
;
345 prom_printf(msg
, of_console_path
);
346 printk(msg
, of_console_path
);
349 void __init
prom_build_devicetree(void)
351 struct device_node
**nextp
;
353 allnodes
= create_node(prom_root_node
, NULL
);
354 allnodes
->path_component_name
= "";
355 allnodes
->full_name
= "/";
357 nextp
= &allnodes
->allnext
;
358 allnodes
->child
= build_tree(allnodes
,
359 prom_getchild(allnodes
->node
),
363 printk("PROM: Built device tree with %u bytes of memory.\n",
364 prom_early_allocated
);
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