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 void * __init prom_early_alloc(unsigned long size)
34 ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
38 prom_early_allocated += size;
43 /* The following routines deal with the black magic of fully naming a
46 * Certain well known named nodes are just the simple name string.
48 * Actual devices have an address specifier appended to the base name
49 * string, like this "foo@addr". The "addr" can be in any number of
50 * formats, and the platform plus the type of the node determine the
51 * format and how it is constructed.
53 * For children of the ROOT node, the naming convention is fixed and
54 * determined by whether this is a sun4u or sun4v system.
56 * For children of other nodes, it is bus type specific. So
57 * we walk up the tree until we discover a "device_type" property
58 * we recognize and we go from there.
60 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
62 struct linux_prom_registers *regs;
63 struct property *rprop;
65 rprop = of_find_property(dp, "reg", NULL);
70 sprintf(tmp_buf, "%s@%x,%x",
72 regs->which_io, regs->phys_addr);
75 /* "name@slot,offset" */
76 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
78 struct linux_prom_registers *regs;
79 struct property *prop;
81 prop = of_find_property(dp, "reg", NULL);
86 sprintf(tmp_buf, "%s@%x,%x",
92 /* "name@devnum[,func]" */
93 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
95 struct linux_prom_pci_registers *regs;
96 struct property *prop;
99 prop = of_find_property(dp, "reg", NULL);
104 devfn = (regs->phys_hi >> 8) & 0xff;
106 sprintf(tmp_buf, "%s@%x,%x",
111 sprintf(tmp_buf, "%s@%x",
117 /* "name@addrhi,addrlo" */
118 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
120 struct linux_prom_registers *regs;
121 struct property *prop;
123 prop = of_find_property(dp, "reg", NULL);
129 sprintf(tmp_buf, "%s@%x,%x",
131 regs->which_io, regs->phys_addr);
134 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
136 struct device_node *parent = dp->parent;
138 if (parent != NULL) {
139 if (!strcmp(parent->type, "pci") ||
140 !strcmp(parent->type, "pciex"))
141 return pci_path_component(dp, tmp_buf);
142 if (!strcmp(parent->type, "sbus"))
143 return sbus_path_component(dp, tmp_buf);
144 if (!strcmp(parent->type, "ebus"))
145 return ebus_path_component(dp, tmp_buf);
147 /* "isa" is handled with platform naming */
150 /* Use platform naming convention. */
151 return sparc32_path_component(dp, tmp_buf);
154 char * __init build_path_component(struct device_node *dp)
156 char tmp_buf[64], *n;
159 __build_path_component(dp, tmp_buf);
160 if (tmp_buf[0] == '\0')
161 strcpy(tmp_buf, dp->name);
163 n = prom_early_alloc(strlen(tmp_buf) + 1);
169 struct device_node *of_console_device;
170 EXPORT_SYMBOL(of_console_device);
172 char *of_console_path;
173 EXPORT_SYMBOL(of_console_path);
175 char *of_console_options;
176 EXPORT_SYMBOL(of_console_options);
178 extern void restore_current(void);
180 void __init of_console_init(void)
182 char *msg = "OF stdout device is: %s\n";
183 struct device_node *dp;
189 of_console_path = prom_early_alloc(256);
194 switch (*romvec->pv_stdout) {
208 prom_printf("Invalid PROM_V0 stdout value %u\n",
214 for_each_node_by_type(dp, type) {
219 prom_printf("Cannot find PROM_V0 console node.\n");
222 of_console_device = dp;
224 strcpy(of_console_path, dp->full_name);
225 if (!strcmp(type, "serial")) {
226 strcat(of_console_path,
227 (skip ? ":b" : ":a"));
234 fd = *romvec->pv_v2bootargs.fd_stdout;
236 spin_lock_irqsave(&prom_lock, flags);
237 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
239 spin_unlock_irqrestore(&prom_lock, flags);
242 prom_printf("Cannot resolve stdout node from "
243 "instance %08x.\n", fd);
246 dp = of_find_node_by_phandle(node);
247 type = of_get_property(dp, "device_type", NULL);
250 prom_printf("Console stdout lacks "
251 "device_type property.\n");
255 if (strcmp(type, "display") && strcmp(type, "serial")) {
256 prom_printf("Console device_type is neither display "
261 of_console_device = dp;
263 if (prom_vers == PROM_V2) {
264 strcpy(of_console_path, dp->full_name);
265 switch (*romvec->pv_stdout) {
267 strcat(of_console_path, ":a");
270 strcat(of_console_path, ":b");
276 dp = of_find_node_by_path("/");
277 path = of_get_property(dp, "stdout-path", NULL);
279 prom_printf("No stdout-path in root node.\n");
282 strcpy(of_console_path, path);
287 of_console_options = strrchr(of_console_path, ':');
288 if (of_console_options) {
289 of_console_options++;
290 if (*of_console_options == '\0')
291 of_console_options = NULL;
294 prom_printf(msg, of_console_path);
295 printk(msg, of_console_path);
298 void __init of_fill_in_cpu_data(void)