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942a6bdd DM |
1 | /* |
2 | * Procedures for creating, accessing and interpreting the device tree. | |
3 | * | |
4 | * Paul Mackerras August 1996. | |
5 | * Copyright (C) 1996-2005 Paul Mackerras. | |
6 | * | |
7 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. | |
8 | * {engebret|bergner}@us.ibm.com | |
9 | * | |
10 | * Adapted for sparc32 by David S. Miller davem@davemloft.net | |
11 | * | |
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. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/bootmem.h> | |
23 | #include <linux/module.h> | |
24 | ||
25 | #include <asm/prom.h> | |
26 | #include <asm/oplib.h> | |
27 | ||
657f201d | 28 | #include "prom.h" |
fb7cd9d9 | 29 | |
efeac2f8 | 30 | void * __init prom_early_alloc(unsigned long size) |
942a6bdd DM |
31 | { |
32 | void *ret; | |
33 | ||
34 | ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL); | |
35 | if (ret != NULL) | |
36 | memset(ret, 0, size); | |
37 | ||
38 | prom_early_allocated += size; | |
39 | ||
40 | return ret; | |
41 | } | |
42 | ||
942a6bdd DM |
43 | /* The following routines deal with the black magic of fully naming a |
44 | * node. | |
45 | * | |
46 | * Certain well known named nodes are just the simple name string. | |
47 | * | |
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. | |
52 | * | |
53 | * For children of the ROOT node, the naming convention is fixed and | |
54 | * determined by whether this is a sun4u or sun4v system. | |
55 | * | |
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. | |
59 | */ | |
60 | static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf) | |
61 | { | |
62 | struct linux_prom_registers *regs; | |
63 | struct property *rprop; | |
64 | ||
65 | rprop = of_find_property(dp, "reg", NULL); | |
66 | if (!rprop) | |
67 | return; | |
68 | ||
69 | regs = rprop->value; | |
70 | sprintf(tmp_buf, "%s@%x,%x", | |
71 | dp->name, | |
72 | regs->which_io, regs->phys_addr); | |
73 | } | |
74 | ||
75 | /* "name@slot,offset" */ | |
76 | static void __init sbus_path_component(struct device_node *dp, char *tmp_buf) | |
77 | { | |
78 | struct linux_prom_registers *regs; | |
79 | struct property *prop; | |
80 | ||
81 | prop = of_find_property(dp, "reg", NULL); | |
82 | if (!prop) | |
83 | return; | |
84 | ||
85 | regs = prop->value; | |
86 | sprintf(tmp_buf, "%s@%x,%x", | |
87 | dp->name, | |
88 | regs->which_io, | |
89 | regs->phys_addr); | |
90 | } | |
91 | ||
92 | /* "name@devnum[,func]" */ | |
93 | static void __init pci_path_component(struct device_node *dp, char *tmp_buf) | |
94 | { | |
95 | struct linux_prom_pci_registers *regs; | |
96 | struct property *prop; | |
97 | unsigned int devfn; | |
98 | ||
99 | prop = of_find_property(dp, "reg", NULL); | |
100 | if (!prop) | |
101 | return; | |
102 | ||
103 | regs = prop->value; | |
104 | devfn = (regs->phys_hi >> 8) & 0xff; | |
105 | if (devfn & 0x07) { | |
106 | sprintf(tmp_buf, "%s@%x,%x", | |
107 | dp->name, | |
108 | devfn >> 3, | |
109 | devfn & 0x07); | |
110 | } else { | |
111 | sprintf(tmp_buf, "%s@%x", | |
112 | dp->name, | |
113 | devfn >> 3); | |
114 | } | |
115 | } | |
116 | ||
117 | /* "name@addrhi,addrlo" */ | |
118 | static void __init ebus_path_component(struct device_node *dp, char *tmp_buf) | |
119 | { | |
120 | struct linux_prom_registers *regs; | |
121 | struct property *prop; | |
122 | ||
123 | prop = of_find_property(dp, "reg", NULL); | |
124 | if (!prop) | |
125 | return; | |
126 | ||
127 | regs = prop->value; | |
128 | ||
129 | sprintf(tmp_buf, "%s@%x,%x", | |
130 | dp->name, | |
131 | regs->which_io, regs->phys_addr); | |
132 | } | |
133 | ||
134 | static void __init __build_path_component(struct device_node *dp, char *tmp_buf) | |
135 | { | |
136 | struct device_node *parent = dp->parent; | |
137 | ||
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); | |
146 | ||
147 | /* "isa" is handled with platform naming */ | |
148 | } | |
149 | ||
150 | /* Use platform naming convention. */ | |
151 | return sparc32_path_component(dp, tmp_buf); | |
152 | } | |
153 | ||
6524036a | 154 | char * __init build_path_component(struct device_node *dp) |
942a6bdd DM |
155 | { |
156 | char tmp_buf[64], *n; | |
157 | ||
158 | tmp_buf[0] = '\0'; | |
159 | __build_path_component(dp, tmp_buf); | |
160 | if (tmp_buf[0] == '\0') | |
161 | strcpy(tmp_buf, dp->name); | |
162 | ||
163 | n = prom_early_alloc(strlen(tmp_buf) + 1); | |
164 | strcpy(n, tmp_buf); | |
165 | ||
166 | return n; | |
167 | } | |
168 | ||
c73fcc84 DM |
169 | extern void restore_current(void); |
170 | ||
23dc758e | 171 | void __init of_console_init(void) |
c73fcc84 DM |
172 | { |
173 | char *msg = "OF stdout device is: %s\n"; | |
174 | struct device_node *dp; | |
175 | unsigned long flags; | |
176 | const char *type; | |
177 | phandle node; | |
f623f388 | 178 | int skip, tmp, fd; |
c73fcc84 DM |
179 | |
180 | of_console_path = prom_early_alloc(256); | |
181 | ||
182 | switch (prom_vers) { | |
183 | case PROM_V0: | |
c73fcc84 DM |
184 | skip = 0; |
185 | switch (*romvec->pv_stdout) { | |
186 | case PROMDEV_SCREEN: | |
187 | type = "display"; | |
188 | break; | |
189 | ||
190 | case PROMDEV_TTYB: | |
191 | skip = 1; | |
192 | /* FALLTHRU */ | |
193 | ||
194 | case PROMDEV_TTYA: | |
195 | type = "serial"; | |
196 | break; | |
197 | ||
198 | default: | |
199 | prom_printf("Invalid PROM_V0 stdout value %u\n", | |
200 | *romvec->pv_stdout); | |
201 | prom_halt(); | |
202 | } | |
203 | ||
f623f388 | 204 | tmp = skip; |
c73fcc84 | 205 | for_each_node_by_type(dp, type) { |
f623f388 | 206 | if (!tmp--) |
c73fcc84 DM |
207 | break; |
208 | } | |
209 | if (!dp) { | |
210 | prom_printf("Cannot find PROM_V0 console node.\n"); | |
211 | prom_halt(); | |
212 | } | |
213 | of_console_device = dp; | |
214 | ||
215 | strcpy(of_console_path, dp->full_name); | |
216 | if (!strcmp(type, "serial")) { | |
217 | strcat(of_console_path, | |
218 | (skip ? ":b" : ":a")); | |
219 | } | |
220 | break; | |
221 | ||
222 | default: | |
223 | case PROM_V2: | |
224 | case PROM_V3: | |
225 | fd = *romvec->pv_v2bootargs.fd_stdout; | |
226 | ||
227 | spin_lock_irqsave(&prom_lock, flags); | |
228 | node = (*romvec->pv_v2devops.v2_inst2pkg)(fd); | |
229 | restore_current(); | |
230 | spin_unlock_irqrestore(&prom_lock, flags); | |
231 | ||
232 | if (!node) { | |
233 | prom_printf("Cannot resolve stdout node from " | |
234 | "instance %08x.\n", fd); | |
235 | prom_halt(); | |
236 | } | |
237 | dp = of_find_node_by_phandle(node); | |
238 | type = of_get_property(dp, "device_type", NULL); | |
239 | ||
240 | if (!type) { | |
241 | prom_printf("Console stdout lacks " | |
242 | "device_type property.\n"); | |
243 | prom_halt(); | |
244 | } | |
245 | ||
246 | if (strcmp(type, "display") && strcmp(type, "serial")) { | |
247 | prom_printf("Console device_type is neither display " | |
248 | "nor serial.\n"); | |
249 | prom_halt(); | |
250 | } | |
251 | ||
252 | of_console_device = dp; | |
253 | ||
254 | if (prom_vers == PROM_V2) { | |
255 | strcpy(of_console_path, dp->full_name); | |
256 | switch (*romvec->pv_stdout) { | |
257 | case PROMDEV_TTYA: | |
258 | strcat(of_console_path, ":a"); | |
259 | break; | |
260 | case PROMDEV_TTYB: | |
261 | strcat(of_console_path, ":b"); | |
262 | break; | |
263 | } | |
264 | } else { | |
265 | const char *path; | |
266 | ||
267 | dp = of_find_node_by_path("/"); | |
268 | path = of_get_property(dp, "stdout-path", NULL); | |
269 | if (!path) { | |
270 | prom_printf("No stdout-path in root node.\n"); | |
271 | prom_halt(); | |
272 | } | |
273 | strcpy(of_console_path, path); | |
274 | } | |
275 | break; | |
276 | } | |
277 | ||
278 | of_console_options = strrchr(of_console_path, ':'); | |
279 | if (of_console_options) { | |
280 | of_console_options++; | |
281 | if (*of_console_options == '\0') | |
282 | of_console_options = NULL; | |
283 | } | |
284 | ||
285 | prom_printf(msg, of_console_path); | |
286 | printk(msg, of_console_path); | |
287 | } | |
288 | ||
23dc758e | 289 | void __init of_fill_in_cpu_data(void) |
942a6bdd | 290 | { |
942a6bdd | 291 | } |