1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Procedures for creating, accessing and interpreting the device tree. |
4 | * |
5 | * Paul Mackerras August 1996. |
6 | * Copyright (C) 1996-2005 Paul Mackerras. |
7 | * |
8 | * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. |
9 | * {engebret|bergner}@us.ibm.com |
10 | * |
11 | * Adapted for sparc32 by David S. Miller davem@davemloft.net |
12 | */ |
13 | |
14 | #include <linux/kernel.h> |
15 | #include <linux/types.h> |
16 | #include <linux/string.h> |
17 | #include <linux/mm.h> |
18 | #include <linux/memblock.h> |
19 | |
20 | #include <asm/prom.h> |
21 | #include <asm/oplib.h> |
22 | #include <asm/leon.h> |
23 | #include <asm/leon_amba.h> |
24 | |
25 | #include "prom.h" |
26 | |
27 | void * __init prom_early_alloc(unsigned long size) |
28 | { |
29 | void *ret; |
30 | |
31 | ret = memblock_alloc(size, SMP_CACHE_BYTES); |
32 | if (!ret) |
33 | panic(fmt: "%s: Failed to allocate %lu bytes\n" , __func__, size); |
34 | |
35 | prom_early_allocated += size; |
36 | |
37 | return ret; |
38 | } |
39 | |
40 | /* The following routines deal with the black magic of fully naming a |
41 | * node. |
42 | * |
43 | * Certain well known named nodes are just the simple name string. |
44 | * |
45 | * Actual devices have an address specifier appended to the base name |
46 | * string, like this "foo@addr". The "addr" can be in any number of |
47 | * formats, and the platform plus the type of the node determine the |
48 | * format and how it is constructed. |
49 | * |
50 | * For children of the ROOT node, the naming convention is fixed and |
51 | * determined by whether this is a sun4u or sun4v system. |
52 | * |
53 | * For children of other nodes, it is bus type specific. So |
54 | * we walk up the tree until we discover a "device_type" property |
55 | * we recognize and we go from there. |
56 | */ |
57 | static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf) |
58 | { |
59 | const char *name = of_get_property(node: dp, name: "name" , NULL); |
60 | struct linux_prom_registers *regs; |
61 | struct property *rprop; |
62 | |
63 | rprop = of_find_property(np: dp, name: "reg" , NULL); |
64 | if (!rprop) |
65 | return; |
66 | |
67 | regs = rprop->value; |
68 | sprintf(buf: tmp_buf, fmt: "%s@%x,%x" , |
69 | name, |
70 | regs->which_io, regs->phys_addr); |
71 | } |
72 | |
73 | /* "name@slot,offset" */ |
74 | static void __init sbus_path_component(struct device_node *dp, char *tmp_buf) |
75 | { |
76 | const char *name = of_get_property(node: dp, name: "name" , NULL); |
77 | struct linux_prom_registers *regs; |
78 | struct property *prop; |
79 | |
80 | prop = of_find_property(np: dp, name: "reg" , NULL); |
81 | if (!prop) |
82 | return; |
83 | |
84 | regs = prop->value; |
85 | sprintf(buf: tmp_buf, fmt: "%s@%x,%x" , |
86 | name, |
87 | regs->which_io, |
88 | regs->phys_addr); |
89 | } |
90 | |
91 | /* "name@devnum[,func]" */ |
92 | static void __init pci_path_component(struct device_node *dp, char *tmp_buf) |
93 | { |
94 | const char *name = of_get_property(node: dp, name: "name" , NULL); |
95 | struct linux_prom_pci_registers *regs; |
96 | struct property *prop; |
97 | unsigned int devfn; |
98 | |
99 | prop = of_find_property(np: dp, name: "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(buf: tmp_buf, fmt: "%s@%x,%x" , |
107 | name, |
108 | devfn >> 3, |
109 | devfn & 0x07); |
110 | } else { |
111 | sprintf(buf: tmp_buf, fmt: "%s@%x" , |
112 | 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 | const char *name = of_get_property(node: dp, name: "name" , NULL); |
121 | struct linux_prom_registers *regs; |
122 | struct property *prop; |
123 | |
124 | prop = of_find_property(np: dp, name: "reg" , NULL); |
125 | if (!prop) |
126 | return; |
127 | |
128 | regs = prop->value; |
129 | |
130 | sprintf(buf: tmp_buf, fmt: "%s@%x,%x" , |
131 | name, |
132 | regs->which_io, regs->phys_addr); |
133 | } |
134 | |
135 | /* "name@irq,addrlo" */ |
136 | static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf) |
137 | { |
138 | const char *name = of_get_property(node: dp, name: "name" , NULL); |
139 | struct amba_prom_registers *regs; |
140 | unsigned int *intr; |
141 | unsigned int reg0; |
142 | struct property *prop; |
143 | int interrupt = 0; |
144 | |
145 | /* In order to get a unique ID in the device tree (multiple AMBA devices |
146 | * may have the same name) the node number is printed |
147 | */ |
148 | prop = of_find_property(np: dp, name: "reg" , NULL); |
149 | if (!prop) { |
150 | reg0 = (unsigned int)dp->phandle; |
151 | } else { |
152 | regs = prop->value; |
153 | reg0 = regs->phys_addr; |
154 | } |
155 | |
156 | /* Not all cores have Interrupt */ |
157 | prop = of_find_property(np: dp, name: "interrupts" , NULL); |
158 | if (!prop) |
159 | intr = &interrupt; /* IRQ0 does not exist */ |
160 | else |
161 | intr = prop->value; |
162 | |
163 | sprintf(buf: tmp_buf, fmt: "%s@%x,%x" , name, *intr, reg0); |
164 | } |
165 | |
166 | static void __init __build_path_component(struct device_node *dp, char *tmp_buf) |
167 | { |
168 | struct device_node *parent = dp->parent; |
169 | |
170 | if (parent != NULL) { |
171 | if (of_node_is_type(np: parent, type: "pci" ) || |
172 | of_node_is_type(np: parent, type: "pciex" )) |
173 | return pci_path_component(dp, tmp_buf); |
174 | if (of_node_is_type(np: parent, type: "sbus" )) |
175 | return sbus_path_component(dp, tmp_buf); |
176 | if (of_node_is_type(np: parent, type: "ebus" )) |
177 | return ebus_path_component(dp, tmp_buf); |
178 | if (of_node_is_type(np: parent, type: "ambapp" )) |
179 | return ambapp_path_component(dp, tmp_buf); |
180 | |
181 | /* "isa" is handled with platform naming */ |
182 | } |
183 | |
184 | /* Use platform naming convention. */ |
185 | return sparc32_path_component(dp, tmp_buf); |
186 | } |
187 | |
188 | char * __init build_path_component(struct device_node *dp) |
189 | { |
190 | const char *name = of_get_property(node: dp, name: "name" , NULL); |
191 | char tmp_buf[64], *n; |
192 | |
193 | tmp_buf[0] = '\0'; |
194 | __build_path_component(dp, tmp_buf); |
195 | if (tmp_buf[0] == '\0') |
196 | strcpy(p: tmp_buf, q: name); |
197 | |
198 | n = prom_early_alloc(strlen(tmp_buf) + 1); |
199 | strcpy(p: n, q: tmp_buf); |
200 | |
201 | return n; |
202 | } |
203 | |
204 | extern void restore_current(void); |
205 | |
206 | void __init of_console_init(void) |
207 | { |
208 | char *msg = "OF stdout device is: %s\n" ; |
209 | struct device_node *dp; |
210 | unsigned long flags; |
211 | const char *type; |
212 | phandle node; |
213 | int skip, tmp, fd; |
214 | |
215 | of_console_path = prom_early_alloc(256); |
216 | |
217 | switch (prom_vers) { |
218 | case PROM_V0: |
219 | skip = 0; |
220 | switch (*romvec->pv_stdout) { |
221 | case PROMDEV_SCREEN: |
222 | type = "display" ; |
223 | break; |
224 | |
225 | case PROMDEV_TTYB: |
226 | skip = 1; |
227 | fallthrough; |
228 | |
229 | case PROMDEV_TTYA: |
230 | type = "serial" ; |
231 | break; |
232 | |
233 | default: |
234 | prom_printf("Invalid PROM_V0 stdout value %u\n" , |
235 | *romvec->pv_stdout); |
236 | prom_halt(); |
237 | } |
238 | |
239 | tmp = skip; |
240 | for_each_node_by_type(dp, type) { |
241 | if (!tmp--) |
242 | break; |
243 | } |
244 | if (!dp) { |
245 | prom_printf("Cannot find PROM_V0 console node.\n" ); |
246 | prom_halt(); |
247 | } |
248 | of_console_device = dp; |
249 | |
250 | sprintf(buf: of_console_path, fmt: "%pOF" , dp); |
251 | if (!strcmp(type, "serial" )) { |
252 | strcat(p: of_console_path, |
253 | q: (skip ? ":b" : ":a" )); |
254 | } |
255 | break; |
256 | |
257 | default: |
258 | case PROM_V2: |
259 | case PROM_V3: |
260 | fd = *romvec->pv_v2bootargs.fd_stdout; |
261 | |
262 | spin_lock_irqsave(&prom_lock, flags); |
263 | node = (*romvec->pv_v2devops.v2_inst2pkg)(fd); |
264 | restore_current(); |
265 | spin_unlock_irqrestore(lock: &prom_lock, flags); |
266 | |
267 | if (!node) { |
268 | prom_printf("Cannot resolve stdout node from " |
269 | "instance %08x.\n" , fd); |
270 | prom_halt(); |
271 | } |
272 | dp = of_find_node_by_phandle(handle: node); |
273 | |
274 | if (!of_node_is_type(np: dp, type: "display" ) && |
275 | !of_node_is_type(np: dp, type: "serial" )) { |
276 | prom_printf("Console device_type is neither display " |
277 | "nor serial.\n" ); |
278 | prom_halt(); |
279 | } |
280 | |
281 | of_console_device = dp; |
282 | |
283 | if (prom_vers == PROM_V2) { |
284 | sprintf(buf: of_console_path, fmt: "%pOF" , dp); |
285 | switch (*romvec->pv_stdout) { |
286 | case PROMDEV_TTYA: |
287 | strcat(p: of_console_path, q: ":a" ); |
288 | break; |
289 | case PROMDEV_TTYB: |
290 | strcat(p: of_console_path, q: ":b" ); |
291 | break; |
292 | } |
293 | } else { |
294 | const char *path; |
295 | |
296 | dp = of_find_node_by_path(path: "/" ); |
297 | path = of_get_property(node: dp, name: "stdout-path" , NULL); |
298 | if (!path) { |
299 | prom_printf("No stdout-path in root node.\n" ); |
300 | prom_halt(); |
301 | } |
302 | strcpy(p: of_console_path, q: path); |
303 | } |
304 | break; |
305 | } |
306 | |
307 | of_console_options = strrchr(of_console_path, ':'); |
308 | if (of_console_options) { |
309 | of_console_options++; |
310 | if (*of_console_options == '\0') |
311 | of_console_options = NULL; |
312 | } |
313 | |
314 | printk(msg, of_console_path); |
315 | } |
316 | |
317 | void __init of_fill_in_cpu_data(void) |
318 | { |
319 | } |
320 | |
321 | void __init irq_trans_init(struct device_node *dp) |
322 | { |
323 | } |
324 | |