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/memblock.h>
25 #include <asm/oplib.h>
27 #include <asm/leon_amba.h>
31 void * __init prom_early_alloc(unsigned long size)
35 ret = memblock_alloc_from(size, SMP_CACHE_BYTES, 0UL);
39 prom_early_allocated += size;
44 /* The following routines deal with the black magic of fully naming a
47 * Certain well known named nodes are just the simple name string.
49 * Actual devices have an address specifier appended to the base name
50 * string, like this "foo@addr". The "addr" can be in any number of
51 * formats, and the platform plus the type of the node determine the
52 * format and how it is constructed.
54 * For children of the ROOT node, the naming convention is fixed and
55 * determined by whether this is a sun4u or sun4v system.
57 * For children of other nodes, it is bus type specific. So
58 * we walk up the tree until we discover a "device_type" property
59 * we recognize and we go from there.
61 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
63 const char *name = of_get_property(dp, "name", NULL);
64 struct linux_prom_registers *regs;
65 struct property *rprop;
67 rprop = of_find_property(dp, "reg", NULL);
72 sprintf(tmp_buf, "%s@%x,%x",
74 regs->which_io, regs->phys_addr);
77 /* "name@slot,offset" */
78 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
80 const char *name = of_get_property(dp, "name", NULL);
81 struct linux_prom_registers *regs;
82 struct property *prop;
84 prop = of_find_property(dp, "reg", NULL);
89 sprintf(tmp_buf, "%s@%x,%x",
95 /* "name@devnum[,func]" */
96 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
98 const char *name = of_get_property(dp, "name", NULL);
99 struct linux_prom_pci_registers *regs;
100 struct property *prop;
103 prop = of_find_property(dp, "reg", NULL);
108 devfn = (regs->phys_hi >> 8) & 0xff;
110 sprintf(tmp_buf, "%s@%x,%x",
115 sprintf(tmp_buf, "%s@%x",
121 /* "name@addrhi,addrlo" */
122 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
124 const char *name = of_get_property(dp, "name", NULL);
125 struct linux_prom_registers *regs;
126 struct property *prop;
128 prop = of_find_property(dp, "reg", NULL);
134 sprintf(tmp_buf, "%s@%x,%x",
136 regs->which_io, regs->phys_addr);
139 /* "name:vendor:device@irq,addrlo" */
140 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
142 const char *name = of_get_property(dp, "name", NULL);
143 struct amba_prom_registers *regs;
144 unsigned int *intr, *device, *vendor, reg0;
145 struct property *prop;
148 /* In order to get a unique ID in the device tree (multiple AMBA devices
149 * may have the same name) the node number is printed
151 prop = of_find_property(dp, "reg", NULL);
153 reg0 = (unsigned int)dp->phandle;
156 reg0 = regs->phys_addr;
159 /* Not all cores have Interrupt */
160 prop = of_find_property(dp, "interrupts", NULL);
162 intr = &interrupt; /* IRQ0 does not exist */
166 prop = of_find_property(dp, "vendor", NULL);
169 vendor = prop->value;
170 prop = of_find_property(dp, "device", NULL);
173 device = prop->value;
175 sprintf(tmp_buf, "%s:%d:%d@%x,%x",
176 name, *vendor, *device,
180 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
182 struct device_node *parent = dp->parent;
184 if (parent != NULL) {
185 if (of_node_is_type(parent, "pci") ||
186 of_node_is_type(parent, "pciex"))
187 return pci_path_component(dp, tmp_buf);
188 if (of_node_is_type(parent, "sbus"))
189 return sbus_path_component(dp, tmp_buf);
190 if (of_node_is_type(parent, "ebus"))
191 return ebus_path_component(dp, tmp_buf);
192 if (of_node_is_type(parent, "ambapp"))
193 return ambapp_path_component(dp, tmp_buf);
195 /* "isa" is handled with platform naming */
198 /* Use platform naming convention. */
199 return sparc32_path_component(dp, tmp_buf);
202 char * __init build_path_component(struct device_node *dp)
204 const char *name = of_get_property(dp, "name", NULL);
205 char tmp_buf[64], *n;
208 __build_path_component(dp, tmp_buf);
209 if (tmp_buf[0] == '\0')
210 strcpy(tmp_buf, name);
212 n = prom_early_alloc(strlen(tmp_buf) + 1);
218 extern void restore_current(void);
220 void __init of_console_init(void)
222 char *msg = "OF stdout device is: %s\n";
223 struct device_node *dp;
229 of_console_path = prom_early_alloc(256);
234 switch (*romvec->pv_stdout) {
248 prom_printf("Invalid PROM_V0 stdout value %u\n",
254 for_each_node_by_type(dp, type) {
259 prom_printf("Cannot find PROM_V0 console node.\n");
262 of_console_device = dp;
264 sprintf(of_console_path, "%pOF", dp);
265 if (!strcmp(type, "serial")) {
266 strcat(of_console_path,
267 (skip ? ":b" : ":a"));
274 fd = *romvec->pv_v2bootargs.fd_stdout;
276 spin_lock_irqsave(&prom_lock, flags);
277 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
279 spin_unlock_irqrestore(&prom_lock, flags);
282 prom_printf("Cannot resolve stdout node from "
283 "instance %08x.\n", fd);
286 dp = of_find_node_by_phandle(node);
288 if (!of_node_is_type(dp, "display") &&
289 !of_node_is_type(dp, "serial")) {
290 prom_printf("Console device_type is neither display "
295 of_console_device = dp;
297 if (prom_vers == PROM_V2) {
298 sprintf(of_console_path, "%pOF", dp);
299 switch (*romvec->pv_stdout) {
301 strcat(of_console_path, ":a");
304 strcat(of_console_path, ":b");
310 dp = of_find_node_by_path("/");
311 path = of_get_property(dp, "stdout-path", NULL);
313 prom_printf("No stdout-path in root node.\n");
316 strcpy(of_console_path, path);
321 of_console_options = strrchr(of_console_path, ':');
322 if (of_console_options) {
323 of_console_options++;
324 if (*of_console_options == '\0')
325 of_console_options = NULL;
328 printk(msg, of_console_path);
331 void __init of_fill_in_cpu_data(void)
335 void __init irq_trans_init(struct device_node *dp)