2 * Copyright (c) 2009-2010 The FreeBSD Foundation
5 * This software was developed by Semihalf under sponsorship from
6 * the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/systm.h>
38 #include <contrib/libfdt/libfdt.h>
40 #include <machine/stdarg.h>
42 #include <dev/fdt/fdt_common.h>
43 #include <dev/ofw/ofwvar.h>
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_bus_subr.h>
50 #define debugf(fmt, args...) do { printf("%s(): ", __func__); \
51 printf(fmt,##args); } while (0)
53 #define debugf(fmt, args...)
57 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) || \
58 defined(SOC_MV_DISCOVERY) || defined(SOC_MV_DOVE) || \
59 defined(SOC_MV_FREY) || defined(SOC_MV_KIRKWOOD) || \
60 defined(SOC_MV_LOKIPLUS) || defined(SOC_MV_ORION)
65 static int ofw_fdt_init(ofw_t, void *);
66 static phandle_t ofw_fdt_peer(ofw_t, phandle_t);
67 static phandle_t ofw_fdt_child(ofw_t, phandle_t);
68 static phandle_t ofw_fdt_parent(ofw_t, phandle_t);
69 static phandle_t ofw_fdt_instance_to_package(ofw_t, ihandle_t);
70 static ssize_t ofw_fdt_getproplen(ofw_t, phandle_t, const char *);
71 static ssize_t ofw_fdt_getprop(ofw_t, phandle_t, const char *, void *, size_t);
72 static int ofw_fdt_nextprop(ofw_t, phandle_t, const char *, char *, size_t);
73 static int ofw_fdt_setprop(ofw_t, phandle_t, const char *, const void *,
75 static ssize_t ofw_fdt_canon(ofw_t, const char *, char *, size_t);
76 static phandle_t ofw_fdt_finddevice(ofw_t, const char *);
77 static ssize_t ofw_fdt_instance_to_path(ofw_t, ihandle_t, char *, size_t);
78 static ssize_t ofw_fdt_package_to_path(ofw_t, phandle_t, char *, size_t);
79 static int ofw_fdt_interpret(ofw_t, const char *, int, cell_t *);
81 static ofw_method_t ofw_fdt_methods[] = {
82 OFWMETHOD(ofw_init, ofw_fdt_init),
83 OFWMETHOD(ofw_peer, ofw_fdt_peer),
84 OFWMETHOD(ofw_child, ofw_fdt_child),
85 OFWMETHOD(ofw_parent, ofw_fdt_parent),
86 OFWMETHOD(ofw_instance_to_package, ofw_fdt_instance_to_package),
87 OFWMETHOD(ofw_getproplen, ofw_fdt_getproplen),
88 OFWMETHOD(ofw_getprop, ofw_fdt_getprop),
89 OFWMETHOD(ofw_nextprop, ofw_fdt_nextprop),
90 OFWMETHOD(ofw_setprop, ofw_fdt_setprop),
91 OFWMETHOD(ofw_canon, ofw_fdt_canon),
92 OFWMETHOD(ofw_finddevice, ofw_fdt_finddevice),
93 OFWMETHOD(ofw_instance_to_path, ofw_fdt_instance_to_path),
94 OFWMETHOD(ofw_package_to_path, ofw_fdt_package_to_path),
95 OFWMETHOD(ofw_interpret, ofw_fdt_interpret),
99 static ofw_def_t ofw_fdt = {
106 static void *fdtp = NULL;
109 sysctl_handle_dtb(SYSCTL_HANDLER_ARGS)
112 return (sysctl_handle_opaque(oidp, fdtp, fdt_totalsize(fdtp), req));
116 sysctl_register_fdt_oid(void *arg)
119 /* If there is no FDT registered, skip adding the sysctl */
123 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb",
124 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, sysctl_handle_dtb, "",
127 SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, 0);
130 ofw_fdt_init(ofw_t ofw, void *data)
134 /* Check FDT blob integrity */
135 if ((err = fdt_check_header(data)) != 0)
143 * Device tree functions.
145 * We use the offset from fdtp to the node as the 'phandle' in OF interface.
147 * phandle is a u32 value, therefore we cannot use the pointer to node as
148 * phandle in 64 bit. We also do not use the usual fdt offset as phandle,
149 * as it can be 0, and the OF interface has special meaning for phandle 0.
153 fdt_offset_phandle(int offset)
157 return ((phandle_t)offset + fdt_off_dt_struct(fdtp));
161 fdt_phandle_offset(phandle_t p)
164 int dtoff = fdt_off_dt_struct(fdtp);
168 return (pint - dtoff);
171 /* Return the next sibling of this node or 0. */
173 ofw_fdt_peer(ofw_t ofw, phandle_t node)
179 offset = fdt_path_offset(fdtp, "/");
181 return (fdt_offset_phandle(offset));
184 offset = fdt_phandle_offset(node);
188 for (depth = 1, offset = fdt_next_node(fdtp, offset, &depth);
190 offset = fdt_next_node(fdtp, offset, &depth)) {
194 return (fdt_offset_phandle(offset));
200 /* Return the first child of this node or 0. */
202 ofw_fdt_child(ofw_t ofw, phandle_t node)
206 offset = fdt_phandle_offset(node);
210 for (depth = 0, offset = fdt_next_node(fdtp, offset, &depth);
211 (offset >= 0) && (depth > 0);
212 offset = fdt_next_node(fdtp, offset, &depth)) {
216 return (fdt_offset_phandle(offset));
222 /* Return the parent of this node or 0. */
224 ofw_fdt_parent(ofw_t ofw, phandle_t node)
226 int offset, paroffset;
228 offset = fdt_phandle_offset(node);
232 paroffset = fdt_parent_offset(fdtp, offset);
233 return (fdt_offset_phandle(paroffset));
236 /* Return the package handle that corresponds to an instance handle. */
238 ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance)
241 /* Where real OF uses ihandles in the tree, FDT uses xref phandles */
242 return (OF_node_from_xref(instance));
245 /* Get the length of a property of a package. */
247 ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname)
249 const struct fdt_property *prop;
252 offset = fdt_phandle_offset(package);
257 prop = fdt_get_property(fdtp, offset, propname, &len);
259 if (prop == NULL && strcmp(propname, "name") == 0) {
260 /* Emulate the 'name' property */
261 fdt_get_name(fdtp, offset, &len);
265 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
266 if (strcmp(propname, "fdtbootcpu") == 0)
267 return (sizeof(cell_t));
268 if (strcmp(propname, "fdtmemreserv") == 0)
269 return (sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp));
278 /* Get the value of a property of a package. */
280 ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
288 offset = fdt_phandle_offset(package);
292 prop = fdt_getprop(fdtp, offset, propname, &len);
294 if (prop == NULL && strcmp(propname, "name") == 0) {
295 /* Emulate the 'name' property */
296 name = fdt_get_name(fdtp, offset, &len);
297 strncpy(buf, name, buflen);
298 if (len + 1 > buflen)
303 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
304 if (strcmp(propname, "fdtbootcpu") == 0) {
305 cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp));
309 if (strcmp(propname, "fdtmemreserv") == 0) {
310 prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp);
311 len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp);
320 bcopy(prop, buf, len);
325 * Get the next property of a package. Return values:
326 * -1: package or previous property does not exist
327 * 0: no more properties
331 ofw_fdt_nextprop(ofw_t ofw, phandle_t package, const char *previous, char *buf,
334 const struct fdt_property *prop;
338 offset = fdt_phandle_offset(package);
342 /* Find the first prop in the node */
343 offset = fdt_first_property_offset(fdtp, offset);
345 return (0); /* No properties */
347 if (previous != NULL) {
348 while (offset >= 0) {
349 prop = fdt_get_property_by_offset(fdtp, offset, NULL);
351 return (-1); /* Internal error */
353 offset = fdt_next_property_offset(fdtp, offset);
355 return (0); /* No more properties */
357 /* Check if the last one was the one we wanted */
358 name = fdt_string(fdtp, fdt32_to_cpu(prop->nameoff));
359 if (strcmp(name, previous) == 0)
364 prop = fdt_get_property_by_offset(fdtp, offset, &offset);
366 return (-1); /* Internal error */
368 strncpy(buf, fdt_string(fdtp, fdt32_to_cpu(prop->nameoff)), size);
373 /* Set the value of a property of a package. */
375 ofw_fdt_setprop(ofw_t ofw, phandle_t package, const char *propname,
376 const void *buf, size_t len)
380 offset = fdt_phandle_offset(package);
384 if (fdt_setprop_inplace(fdtp, offset, propname, buf, len) != 0)
385 /* Try to add property, when setting value inplace failed */
386 return (fdt_setprop(fdtp, offset, propname, buf, len));
391 /* Convert a device specifier to a fully qualified pathname. */
393 ofw_fdt_canon(ofw_t ofw, const char *device, char *buf, size_t len)
399 /* Return a package handle for the specified device. */
401 ofw_fdt_finddevice(ofw_t ofw, const char *device)
405 offset = fdt_path_offset(fdtp, device);
408 return (fdt_offset_phandle(offset));
411 /* Return the fully qualified pathname corresponding to an instance. */
413 ofw_fdt_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len)
417 phandle = OF_instance_to_package(instance);
421 return (OF_package_to_path(phandle, buf, len));
424 /* Return the fully qualified pathname corresponding to a package. */
426 ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
432 #if defined(FDT_MARVELL) || defined(__powerpc__)
434 ofw_fdt_fixup(ofw_t ofw)
436 #define FDT_MODEL_LEN 80
437 char model[FDT_MODEL_LEN];
442 if ((root = ofw_fdt_finddevice(ofw, "/")) == -1)
445 if ((len = ofw_fdt_getproplen(ofw, root, "model")) <= 0)
448 bzero(model, FDT_MODEL_LEN);
449 if (ofw_fdt_getprop(ofw, root, "model", model, FDT_MODEL_LEN) <= 0)
453 * Search fixup table and call handler if appropriate.
455 for (i = 0; fdt_fixup_table[i].model != NULL; i++) {
456 if (strncmp(model, fdt_fixup_table[i].model,
459 * Sometimes it's convenient to provide one
460 * fixup entry that refers to many boards.
461 * To handle this case, simply check if model
462 * is compatible parameter
464 if(!ofw_bus_node_is_compatible(root,
465 fdt_fixup_table[i].model))
468 if (fdt_fixup_table[i].handler != NULL)
469 (*fdt_fixup_table[i].handler)(root);
477 ofw_fdt_interpret(ofw_t ofw, const char *cmd, int nret, cell_t *retvals)
479 #if defined(FDT_MARVELL) || defined(__powerpc__)
483 * Note: FDT does not have the possibility to 'interpret' commands,
484 * but we abuse the interface a bit to use it for doing non-standard
485 * operations on the device tree blob.
487 * Currently the only supported 'command' is to trigger performing
490 if (strncmp("perform-fixup", cmd, 13) != 0)
493 rv = ofw_fdt_fixup(ofw);