2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2009-2010 The FreeBSD Foundation
6 * This software was developed by Semihalf under sponsorship from
7 * the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/ctype.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/systm.h>
40 #include <contrib/libfdt/libfdt.h>
42 #include <machine/stdarg.h>
44 #include <dev/fdt/fdt_common.h>
45 #include <dev/ofw/ofwvar.h>
46 #include <dev/ofw/openfirm.h>
47 #include <dev/ofw/ofw_bus_subr.h>
52 #define debugf(fmt, args...) do { printf("%s(): ", __func__); \
53 printf(fmt,##args); } while (0)
55 #define debugf(fmt, args...)
59 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) || \
60 defined(SOC_MV_DISCOVERY) || defined(SOC_MV_DOVE) || \
61 defined(SOC_MV_FREY) || defined(SOC_MV_KIRKWOOD) || \
62 defined(SOC_MV_LOKIPLUS) || defined(SOC_MV_ORION)
67 static int ofw_fdt_init(ofw_t, void *);
68 static phandle_t ofw_fdt_peer(ofw_t, phandle_t);
69 static phandle_t ofw_fdt_child(ofw_t, phandle_t);
70 static phandle_t ofw_fdt_parent(ofw_t, phandle_t);
71 static phandle_t ofw_fdt_instance_to_package(ofw_t, ihandle_t);
72 static ssize_t ofw_fdt_getproplen(ofw_t, phandle_t, const char *);
73 static ssize_t ofw_fdt_getprop(ofw_t, phandle_t, const char *, void *, size_t);
74 static int ofw_fdt_nextprop(ofw_t, phandle_t, const char *, char *, size_t);
75 static int ofw_fdt_setprop(ofw_t, phandle_t, const char *, const void *,
77 static ssize_t ofw_fdt_canon(ofw_t, const char *, char *, size_t);
78 static phandle_t ofw_fdt_finddevice(ofw_t, const char *);
79 static ssize_t ofw_fdt_instance_to_path(ofw_t, ihandle_t, char *, size_t);
80 static ssize_t ofw_fdt_package_to_path(ofw_t, phandle_t, char *, size_t);
81 static int ofw_fdt_interpret(ofw_t, const char *, int, cell_t *);
83 static ofw_method_t ofw_fdt_methods[] = {
84 OFWMETHOD(ofw_init, ofw_fdt_init),
85 OFWMETHOD(ofw_peer, ofw_fdt_peer),
86 OFWMETHOD(ofw_child, ofw_fdt_child),
87 OFWMETHOD(ofw_parent, ofw_fdt_parent),
88 OFWMETHOD(ofw_instance_to_package, ofw_fdt_instance_to_package),
89 OFWMETHOD(ofw_getproplen, ofw_fdt_getproplen),
90 OFWMETHOD(ofw_getprop, ofw_fdt_getprop),
91 OFWMETHOD(ofw_nextprop, ofw_fdt_nextprop),
92 OFWMETHOD(ofw_setprop, ofw_fdt_setprop),
93 OFWMETHOD(ofw_canon, ofw_fdt_canon),
94 OFWMETHOD(ofw_finddevice, ofw_fdt_finddevice),
95 OFWMETHOD(ofw_instance_to_path, ofw_fdt_instance_to_path),
96 OFWMETHOD(ofw_package_to_path, ofw_fdt_package_to_path),
97 OFWMETHOD(ofw_interpret, ofw_fdt_interpret),
101 static ofw_def_t ofw_fdt = {
108 #define FDT_FBSDVER_LEN 16
109 #define FDT_MODEL_LEN 80
110 #define FDT_COMPAT_LEN 255
111 #define FDT_SERIAL_LEN 32
113 static void *fdtp = NULL;
114 static char fdt_model[FDT_MODEL_LEN];
115 static char fdt_compatible[FDT_COMPAT_LEN];
116 static char fdt_fbsd_version[FDT_FBSDVER_LEN];
117 static char fdt_serial[FDT_SERIAL_LEN];
120 sysctl_handle_dtb(SYSCTL_HANDLER_ARGS)
123 return (sysctl_handle_opaque(oidp, fdtp, fdt_totalsize(fdtp), req));
127 sysctl_register_fdt_oid(void *arg)
130 /* If there is no FDT registered, skip adding the sysctl */
134 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb",
135 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
136 sysctl_handle_dtb, "", "Device Tree Blob");
137 if (fdt_model[0] != '\0')
138 SYSCTL_ADD_STRING(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt),
139 OID_AUTO, "model", CTLFLAG_RD, fdt_model,
140 FDT_MODEL_LEN, "System board model");
141 if (fdt_compatible[0] != '\0')
142 SYSCTL_ADD_STRING(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt),
143 OID_AUTO, "compatible", CTLFLAG_RD, fdt_compatible,
144 FDT_COMPAT_LEN, "Compatible platforms");
145 if (fdt_fbsd_version[0] != '\0')
146 SYSCTL_ADD_STRING(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt),
147 OID_AUTO, "freebsd-version", CTLFLAG_RD, fdt_fbsd_version,
148 FDT_FBSDVER_LEN, "FreeBSD DTS branding version");
149 if (fdt_serial[0] != '\0')
150 SYSCTL_ADD_STRING(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt),
151 OID_AUTO, "serial-number", CTLFLAG_RD, fdt_serial,
152 FDT_SERIAL_LEN, "Serial number");
154 SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, NULL);
157 ofw_fdt_init(ofw_t ofw, void *data)
164 /* Check FDT blob integrity */
165 if ((err = fdt_check_header(data)) != 0)
169 root = ofw_fdt_finddevice(NULL, "/");
170 len = ofw_fdt_getproplen(NULL, root, "model");
171 if (len > 0 && len <= FDT_MODEL_LEN) {
172 bzero(fdt_model, FDT_MODEL_LEN);
173 ofw_fdt_getprop(NULL, root, "model", fdt_model, FDT_MODEL_LEN);
175 len = ofw_fdt_getproplen(NULL, root, "compatible");
176 if (len > 0 && len <= FDT_COMPAT_LEN) {
177 bzero(fdt_compatible, FDT_COMPAT_LEN);
178 ofw_fdt_getprop(NULL, root, "compatible", fdt_compatible,
180 /* Replace the middle '\0' with ' ' */
181 for (i = 0; i < len - 1; i++)
182 if (fdt_compatible[i] == '\0')
183 fdt_compatible[i] = ' ';
185 len = ofw_fdt_getproplen(NULL, root, "freebsd,dts-version");
186 if (len > 0 && len <= FDT_FBSDVER_LEN) {
187 bzero(fdt_fbsd_version, FDT_FBSDVER_LEN);
188 ofw_fdt_getprop(NULL, root, "freebsd,dts-version",
189 fdt_fbsd_version, FDT_FBSDVER_LEN);
191 len = ofw_fdt_getproplen(NULL, root, "serial-number");
192 if (len > 0 && len <= FDT_SERIAL_LEN) {
193 bzero(fdt_serial, FDT_SERIAL_LEN);
194 ofw_fdt_getprop(NULL, root, "serial-number",
195 fdt_serial, FDT_SERIAL_LEN);
197 * Non-standard property; check for NUL-terminated
200 for (i = 0; i < len - 1; i++) {
201 if (!isprint(fdt_serial[i])) {
202 fdt_serial[0] = '\0';
206 if (fdt_serial[len - 1] != '\0')
207 fdt_serial[0] = '\0';
213 * Device tree functions.
215 * We use the offset from fdtp to the node as the 'phandle' in OF interface.
217 * phandle is a u32 value, therefore we cannot use the pointer to node as
218 * phandle in 64 bit. We also do not use the usual fdt offset as phandle,
219 * as it can be 0, and the OF interface has special meaning for phandle 0.
223 fdt_offset_phandle(int offset)
227 return ((phandle_t)offset + fdt_off_dt_struct(fdtp));
231 fdt_phandle_offset(phandle_t p)
234 int dtoff = fdt_off_dt_struct(fdtp);
238 return (pint - dtoff);
241 /* Return the next sibling of this node or 0. */
243 ofw_fdt_peer(ofw_t ofw, phandle_t node)
249 offset = fdt_path_offset(fdtp, "/");
251 return (fdt_offset_phandle(offset));
254 offset = fdt_phandle_offset(node);
257 offset = fdt_next_subnode(fdtp, offset);
258 return (fdt_offset_phandle(offset));
261 /* Return the first child of this node or 0. */
263 ofw_fdt_child(ofw_t ofw, phandle_t node)
267 offset = fdt_phandle_offset(node);
270 offset = fdt_first_subnode(fdtp, offset);
271 return (fdt_offset_phandle(offset));
274 /* Return the parent of this node or 0. */
276 ofw_fdt_parent(ofw_t ofw, phandle_t node)
278 int offset, paroffset;
280 offset = fdt_phandle_offset(node);
284 paroffset = fdt_parent_offset(fdtp, offset);
285 return (fdt_offset_phandle(paroffset));
288 /* Return the package handle that corresponds to an instance handle. */
290 ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance)
293 /* Where real OF uses ihandles in the tree, FDT uses xref phandles */
294 return (OF_node_from_xref(instance));
297 /* Get the length of a property of a package. */
299 ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname)
304 offset = fdt_phandle_offset(package);
309 prop = fdt_getprop(fdtp, offset, propname, &len);
311 if (prop == NULL && strcmp(propname, "name") == 0) {
312 /* Emulate the 'name' property */
313 fdt_get_name(fdtp, offset, &len);
317 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
318 if (strcmp(propname, "fdtbootcpu") == 0)
319 return (sizeof(cell_t));
320 if (strcmp(propname, "fdtmemreserv") == 0)
321 return (sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp));
330 /* Get the value of a property of a package. */
332 ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
340 offset = fdt_phandle_offset(package);
344 prop = fdt_getprop(fdtp, offset, propname, &len);
346 if (prop == NULL && strcmp(propname, "name") == 0) {
347 /* Emulate the 'name' property */
348 name = fdt_get_name(fdtp, offset, &len);
349 strncpy(buf, name, buflen);
353 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
354 if (strcmp(propname, "fdtbootcpu") == 0) {
355 cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp));
359 if (strcmp(propname, "fdtmemreserv") == 0) {
360 prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp);
361 len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp);
368 bcopy(prop, buf, min(len, buflen));
374 * Get the next property of a package. Return values:
375 * -1: package or previous property does not exist
376 * 0: no more properties
380 ofw_fdt_nextprop(ofw_t ofw, phandle_t package, const char *previous, char *buf,
387 offset = fdt_phandle_offset(package);
391 if (previous == NULL)
392 /* Find the first prop in the node */
393 offset = fdt_first_property_offset(fdtp, offset);
395 fdt_for_each_property_offset(offset, fdtp, offset) {
396 prop = fdt_getprop_by_offset(fdtp, offset, &name, NULL);
398 return (-1); /* Internal error */
399 /* Skip until we find 'previous', then bail out */
400 if (strcmp(name, previous) != 0)
402 offset = fdt_next_property_offset(fdtp, offset);
408 return (0); /* No properties */
410 prop = fdt_getprop_by_offset(fdtp, offset, &name, &offset);
412 return (-1); /* Internal error */
414 strncpy(buf, name, size);
419 /* Set the value of a property of a package. */
421 ofw_fdt_setprop(ofw_t ofw, phandle_t package, const char *propname,
422 const void *buf, size_t len)
426 offset = fdt_phandle_offset(package);
430 if (fdt_setprop_inplace(fdtp, offset, propname, buf, len) != 0)
431 /* Try to add property, when setting value inplace failed */
432 return (fdt_setprop(fdtp, offset, propname, buf, len));
437 /* Convert a device specifier to a fully qualified pathname. */
439 ofw_fdt_canon(ofw_t ofw, const char *device, char *buf, size_t len)
445 /* Return a package handle for the specified device. */
447 ofw_fdt_finddevice(ofw_t ofw, const char *device)
451 offset = fdt_path_offset(fdtp, device);
454 return (fdt_offset_phandle(offset));
457 /* Return the fully qualified pathname corresponding to an instance. */
459 ofw_fdt_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len)
463 phandle = OF_instance_to_package(instance);
467 return (OF_package_to_path(phandle, buf, len));
470 /* Return the fully qualified pathname corresponding to a package. */
472 ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
478 #if defined(FDT_MARVELL)
480 ofw_fdt_fixup(ofw_t ofw)
482 char model[FDT_MODEL_LEN];
487 if ((root = ofw_fdt_finddevice(ofw, "/")) == -1)
490 if ((len = ofw_fdt_getproplen(ofw, root, "model")) <= 0)
493 bzero(model, FDT_MODEL_LEN);
494 if (ofw_fdt_getprop(ofw, root, "model", model, FDT_MODEL_LEN) <= 0)
498 * Search fixup table and call handler if appropriate.
500 for (i = 0; fdt_fixup_table[i].model != NULL; i++) {
501 if (strncmp(model, fdt_fixup_table[i].model,
504 * Sometimes it's convenient to provide one
505 * fixup entry that refers to many boards.
506 * To handle this case, simply check if model
507 * is compatible parameter
509 if(!ofw_bus_node_is_compatible(root,
510 fdt_fixup_table[i].model))
513 if (fdt_fixup_table[i].handler != NULL)
514 (*fdt_fixup_table[i].handler)(root);
522 ofw_fdt_interpret(ofw_t ofw, const char *cmd, int nret, cell_t *retvals)
524 #if defined(FDT_MARVELL)
528 * Note: FDT does not have the possibility to 'interpret' commands,
529 * but we abuse the interface a bit to use it for doing non-standard
530 * operations on the device tree blob.
532 * Currently the only supported 'command' is to trigger performing
535 if (strncmp("perform-fixup", cmd, 13) != 0)
538 rv = ofw_fdt_fixup(ofw);