fdt_subr.c revision 1.20 1 /* $NetBSD: fdt_subr.c,v 1.20 2017/12/10 21:38:27 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: fdt_subr.c,v 1.20 2017/12/10 21:38:27 skrll Exp $");
31
32 #include <sys/param.h>
33 #include <sys/bus.h>
34
35 #include <libfdt.h>
36 #include <dev/fdt/fdtvar.h>
37
38 static const void *fdt_data;
39
40 static struct fdt_conslist fdt_console_list =
41 TAILQ_HEAD_INITIALIZER(fdt_console_list);
42
43 bool
44 fdtbus_set_data(const void *data)
45 {
46 KASSERT(fdt_data == NULL);
47 if (fdt_check_header(data) != 0) {
48 return false;
49 }
50 fdt_data = data;
51 return true;
52 }
53
54 const void *
55 fdtbus_get_data(void)
56 {
57 return fdt_data;
58 }
59
60 int
61 fdtbus_offset2phandle(int offset)
62 {
63 if (offset < 0)
64 return 0;
65
66 return offset + fdt_off_dt_struct(fdt_data);
67 }
68
69 int
70 fdtbus_phandle2offset(int phandle)
71 {
72 const int dtoff = fdt_off_dt_struct(fdt_data);
73
74 if (phandle == -1)
75 phandle = dtoff;
76
77 if (phandle < dtoff)
78 return -1;
79
80 return phandle - dtoff;
81 }
82
83 static bool fdtbus_decoderegprop = true;
84
85 void
86 fdtbus_set_decoderegprop(bool decode)
87 {
88 fdtbus_decoderegprop = decode;
89 }
90
91 static int
92 fdtbus_get_addr_cells(int phandle)
93 {
94 uint32_t addr_cells;
95
96 if (of_getprop_uint32(phandle, "#address-cells", &addr_cells))
97 addr_cells = 2;
98
99 return addr_cells;
100 }
101
102 static int
103 fdtbus_get_size_cells(int phandle)
104 {
105 uint32_t size_cells;
106
107 if (of_getprop_uint32(phandle, "#size-cells", &size_cells))
108 size_cells = 0;
109
110 return size_cells;
111 }
112
113 int
114 fdtbus_get_phandle(int phandle, const char *prop)
115 {
116 u_int phandle_ref;
117 const u_int *buf;
118 int len;
119
120 buf = fdt_getprop(fdtbus_get_data(),
121 fdtbus_phandle2offset(phandle), prop, &len);
122 if (buf == NULL || len < sizeof(phandle_ref))
123 return -1;
124
125 phandle_ref = be32dec(buf);
126
127 return fdtbus_get_phandle_from_native(phandle_ref);
128 }
129
130 int
131 fdtbus_get_phandle_from_native(int phandle)
132 {
133 const int off = fdt_node_offset_by_phandle(fdt_data, phandle);
134 if (off < 0) {
135 return -1;
136 }
137 return fdtbus_offset2phandle(off);
138 }
139
140 bool
141 fdtbus_get_path(int phandle, char *buf, size_t buflen)
142 {
143 const int off = fdtbus_phandle2offset(phandle);
144 if (off < 0) {
145 return false;
146 }
147 if (fdt_get_path(fdt_data, off, buf, (int)buflen) != 0) {
148 return false;
149 }
150 return true;
151 }
152
153 static uint64_t
154 fdtbus_get_cells(const uint8_t *buf, int cells)
155 {
156 switch (cells) {
157 case 0: return 0;
158 case 1: return be32dec(buf);
159 case 2: return be64dec(buf);
160 default: panic("fdtbus_get_cells: bad cells val %d\n", cells);
161 }
162 }
163
164 static uint64_t
165 fdtbus_decode_range(int phandle, uint64_t paddr)
166 {
167 const int parent = OF_parent(phandle);
168 if (parent == -1)
169 return paddr;
170
171 if (!fdtbus_decoderegprop)
172 return paddr;
173
174 const uint8_t *buf;
175 int len;
176
177 buf = fdt_getprop(fdtbus_get_data(),
178 fdtbus_phandle2offset(phandle), "ranges", &len);
179 if (buf == NULL)
180 return paddr;
181
182 if (len == 0) {
183 /* pass through to parent */
184 return fdtbus_decode_range(parent, paddr);
185 }
186
187 const int addr_cells = fdtbus_get_addr_cells(phandle);
188 const int size_cells = fdtbus_get_size_cells(phandle);
189 const int paddr_cells = fdtbus_get_addr_cells(OF_parent(parent));
190 if (addr_cells == -1 || size_cells == -1 || paddr_cells == -1)
191 return paddr;
192
193 while (len > 0) {
194 uint64_t cba, pba, cl;
195 cba = fdtbus_get_cells(buf, addr_cells);
196 buf += addr_cells * 4;
197 pba = fdtbus_get_cells(buf, paddr_cells);
198 buf += paddr_cells * 4;
199 cl = fdtbus_get_cells(buf, size_cells);
200 buf += size_cells * 4;
201
202 if (paddr >= cba && paddr < cba + cl)
203 return fdtbus_decode_range(parent, pba) + (paddr - cba);
204
205 len -= (addr_cells + paddr_cells + size_cells) * 4;
206 }
207
208 /* No mapping found */
209 return paddr;
210 }
211
212 int
213 fdtbus_get_reg_byname(int phandle, const char *name, bus_addr_t *paddr,
214 bus_size_t *psize)
215 {
216 const char *reg_names, *p;
217 u_int index;
218 int len, resid;
219 int error = ENOENT;
220
221 reg_names = fdtbus_get_prop(phandle, "reg-names", &len);
222 if (len <= 0)
223 return error;
224
225 p = reg_names;
226 for (index = 0, resid = len; resid > 0; index++) {
227 if (strcmp(p, name) == 0) {
228 error = fdtbus_get_reg(phandle, index, paddr, psize);
229 break;
230 }
231 resid -= strlen(p);
232 p += strlen(p) + 1;
233 }
234
235 return error;
236 }
237
238 int
239 fdtbus_get_reg(int phandle, u_int index, bus_addr_t *paddr, bus_size_t *psize)
240 {
241 uint64_t addr, size;
242 int error;
243
244 error = fdtbus_get_reg64(phandle, index, &addr, &size);
245 if (error)
246 return error;
247
248 if (sizeof(bus_addr_t) == 4 && (addr + size) > 0x100000000)
249 return ERANGE;
250
251 if (paddr)
252 *paddr = (bus_addr_t)addr;
253 if (psize)
254 *psize = (bus_size_t)size;
255
256 return 0;
257 }
258
259 int
260 fdtbus_get_reg64(int phandle, u_int index, uint64_t *paddr, uint64_t *psize)
261 {
262 uint64_t addr, size;
263 const uint8_t *buf;
264 int len;
265
266 const int addr_cells = fdtbus_get_addr_cells(OF_parent(phandle));
267 const int size_cells = fdtbus_get_size_cells(OF_parent(phandle));
268 if (addr_cells == -1 || size_cells == -1)
269 return EINVAL;
270
271 buf = fdt_getprop(fdtbus_get_data(),
272 fdtbus_phandle2offset(phandle), "reg", &len);
273 if (buf == NULL || len <= 0)
274 return EINVAL;
275
276 const u_int reglen = size_cells * 4 + addr_cells * 4;
277 if (reglen == 0)
278 return EINVAL;
279
280 if (index >= len / reglen)
281 return ENXIO;
282
283 buf += index * reglen;
284 addr = fdtbus_get_cells(buf, addr_cells);
285 buf += addr_cells * 4;
286 size = fdtbus_get_cells(buf, size_cells);
287
288 if (paddr) {
289 *paddr = fdtbus_decode_range(OF_parent(phandle), addr);
290 const char *name = fdt_get_name(fdtbus_get_data(),
291 fdtbus_phandle2offset(phandle), NULL);
292 aprint_debug("fdt: [%s] decoded addr #%u: %llx -> %llx\n",
293 name, index, addr, *paddr);
294 }
295 if (psize)
296 *psize = size;
297
298 return 0;
299 }
300
301 const struct fdt_console *
302 fdtbus_get_console(void)
303 {
304 static const struct fdt_console_info *booted_console = NULL;
305
306 if (booted_console == NULL) {
307 __link_set_decl(fdt_consoles, struct fdt_console_info);
308 struct fdt_console_info * const *info;
309 const struct fdt_console_info *best_info = NULL;
310 const int phandle = fdtbus_get_stdout_phandle();
311 int best_match = 0;
312
313 __link_set_foreach(info, fdt_consoles) {
314 const int match = (*info)->ops->match(phandle);
315 if (match > best_match) {
316 best_match = match;
317 best_info = *info;
318 }
319 }
320
321 booted_console = best_info;
322 }
323
324 return booted_console == NULL ? NULL : booted_console->ops;
325 }
326
327 const char *
328 fdtbus_get_stdout_path(void)
329 {
330 const char *prop;
331
332 const int off = fdt_path_offset(fdtbus_get_data(), "/chosen");
333 if (off < 0)
334 return NULL;
335
336 prop = fdt_getprop(fdtbus_get_data(), off, "stdout-path", NULL);
337 if (prop != NULL)
338 return prop;
339
340 /* If the stdout-path property is not found, assume serial0 */
341 return "serial0:115200n8";
342 }
343
344 int
345 fdtbus_get_stdout_phandle(void)
346 {
347 const char *prop, *p;
348 int off, len;
349
350 prop = fdtbus_get_stdout_path();
351 if (prop == NULL)
352 return -1;
353
354 p = strchr(prop, ':');
355 len = p == NULL ? strlen(prop) : (p - prop);
356 if (*prop != '/') {
357 /* Alias */
358 prop = fdt_get_alias_namelen(fdtbus_get_data(), prop, len);
359 if (prop == NULL)
360 return -1;
361 len = strlen(prop);
362 }
363 off = fdt_path_offset_namelen(fdtbus_get_data(), prop, len);
364 if (off < 0)
365 return -1;
366
367 return fdtbus_offset2phandle(off);
368 }
369
370 int
371 fdtbus_get_stdout_speed(void)
372 {
373 const char *prop, *p;
374
375 prop = fdtbus_get_stdout_path();
376 if (prop == NULL)
377 return -1;
378
379 p = strchr(prop, ':');
380 if (p == NULL)
381 return -1;
382
383 return (int)strtoul(p + 1, NULL, 10);
384 }
385
386 tcflag_t
387 fdtbus_get_stdout_flags(void)
388 {
389 const char *prop, *p;
390 tcflag_t flags = TTYDEF_CFLAG;
391 char *ep;
392
393 prop = fdtbus_get_stdout_path();
394 if (prop == NULL)
395 return flags;
396
397 p = strchr(prop, ':');
398 if (p == NULL)
399 return flags;
400
401 ep = NULL;
402 (void)strtoul(p + 1, &ep, 10);
403 if (ep == NULL)
404 return flags;
405
406 /* <baud>{<parity>{<bits>{<flow>}}} */
407 while (*ep) {
408 switch (*ep) {
409 /* parity */
410 case 'n': flags &= ~(PARENB|PARODD); break;
411 case 'e': flags &= ~PARODD; flags |= PARENB; break;
412 case 'o': flags |= (PARENB|PARODD); break;
413 /* bits */
414 case '5': flags &= ~CSIZE; flags |= CS5; break;
415 case '6': flags &= ~CSIZE; flags |= CS6; break;
416 case '7': flags &= ~CSIZE; flags |= CS7; break;
417 case '8': flags &= ~CSIZE; flags |= CS8; break;
418 /* flow */
419 case 'r': flags |= CRTSCTS; break;
420 }
421 ep++;
422 }
423
424 return flags;
425 }
426
427 bool
428 fdtbus_status_okay(int phandle)
429 {
430 const int off = fdtbus_phandle2offset(phandle);
431
432 const char *prop = fdt_getprop(fdtbus_get_data(), off, "status", NULL);
433 if (prop == NULL)
434 return true;
435
436 return strncmp(prop, "ok", 2) == 0;
437 }
438
439 const void *
440 fdtbus_get_prop(int phandle, const char *prop, int *plen)
441 {
442 const int off = fdtbus_phandle2offset(phandle);
443
444 return fdt_getprop(fdtbus_get_data(), off, prop, plen);
445 }
446
447 const char *
448 fdtbus_get_string(int phandle, const char *prop)
449 {
450 const int off = fdtbus_phandle2offset(phandle);
451
452 if (strcmp(prop, "name") == 0)
453 return fdt_get_name(fdtbus_get_data(), off, NULL);
454 else
455 return fdt_getprop(fdtbus_get_data(), off, prop, NULL);
456 }
457
458 const char *
459 fdtbus_get_string_index(int phandle, const char *prop, u_int index)
460 {
461 const char *names, *name;
462 int len, cur;
463
464 if ((len = OF_getproplen(phandle, prop)) < 0)
465 return NULL;
466
467 names = fdtbus_get_string(phandle, prop);
468
469 for (name = names, cur = 0; len > 0;
470 name += strlen(name) + 1, cur++) {
471 if (index == cur)
472 return name;
473 }
474
475 return NULL;
476 }
477