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>
49 #define debugf(fmt, args...) do { printf("%s(): ", __func__); \
50 printf(fmt,##args); } while (0)
52 #define debugf(fmt, args...)
56 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) || \
57 defined(SOC_MV_DISCOVERY) || defined(SOC_MV_DOVE) || \
58 defined(SOC_MV_FREY) || defined(SOC_MV_KIRKWOOD) || \
59 defined(SOC_MV_LOKIPLUS) || defined(SOC_MV_ORION)
64 static int ofw_fdt_init(ofw_t, void *);
65 static phandle_t ofw_fdt_peer(ofw_t, phandle_t);
66 static phandle_t ofw_fdt_child(ofw_t, phandle_t);
67 static phandle_t ofw_fdt_parent(ofw_t, phandle_t);
68 static phandle_t ofw_fdt_instance_to_package(ofw_t, ihandle_t);
69 static ssize_t ofw_fdt_getproplen(ofw_t, phandle_t, const char *);
70 static ssize_t ofw_fdt_getprop(ofw_t, phandle_t, const char *, void *, size_t);
71 static int ofw_fdt_nextprop(ofw_t, phandle_t, const char *, char *, size_t);
72 static int ofw_fdt_setprop(ofw_t, phandle_t, const char *, const void *,
74 static ssize_t ofw_fdt_canon(ofw_t, const char *, char *, size_t);
75 static phandle_t ofw_fdt_finddevice(ofw_t, const char *);
76 static ssize_t ofw_fdt_instance_to_path(ofw_t, ihandle_t, char *, size_t);
77 static ssize_t ofw_fdt_package_to_path(ofw_t, phandle_t, char *, size_t);
78 static int ofw_fdt_interpret(ofw_t, const char *, int, cell_t *);
80 static ofw_method_t ofw_fdt_methods[] = {
81 OFWMETHOD(ofw_init, ofw_fdt_init),
82 OFWMETHOD(ofw_peer, ofw_fdt_peer),
83 OFWMETHOD(ofw_child, ofw_fdt_child),
84 OFWMETHOD(ofw_parent, ofw_fdt_parent),
85 OFWMETHOD(ofw_instance_to_package, ofw_fdt_instance_to_package),
86 OFWMETHOD(ofw_getproplen, ofw_fdt_getproplen),
87 OFWMETHOD(ofw_getprop, ofw_fdt_getprop),
88 OFWMETHOD(ofw_nextprop, ofw_fdt_nextprop),
89 OFWMETHOD(ofw_setprop, ofw_fdt_setprop),
90 OFWMETHOD(ofw_canon, ofw_fdt_canon),
91 OFWMETHOD(ofw_finddevice, ofw_fdt_finddevice),
92 OFWMETHOD(ofw_instance_to_path, ofw_fdt_instance_to_path),
93 OFWMETHOD(ofw_package_to_path, ofw_fdt_package_to_path),
94 OFWMETHOD(ofw_interpret, ofw_fdt_interpret),
98 static ofw_def_t ofw_fdt = {
105 static void *fdtp = NULL;
108 sysctl_handle_dtb(SYSCTL_HANDLER_ARGS)
111 return (sysctl_handle_opaque(oidp, fdtp, fdt_totalsize(fdtp), req));
115 sysctl_register_fdt_oid(void *arg)
118 /* If there is no FDT registered, skip adding the sysctl */
122 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_fdt), OID_AUTO, "dtb",
123 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, sysctl_handle_dtb, "",
126 SYSINIT(dtb_oid, SI_SUB_KMEM, SI_ORDER_ANY, sysctl_register_fdt_oid, 0);
129 ofw_fdt_init(ofw_t ofw, void *data)
133 /* Check FDT blob integrity */
134 if ((err = fdt_check_header(data)) != 0)
142 * Device tree functions.
144 * We use the offset from fdtp to the node as the 'phandle' in OF interface.
146 * phandle is a u32 value, therefore we cannot use the pointer to node as
147 * phandle in 64 bit. We also do not use the usual fdt offset as phandle,
148 * as it can be 0, and the OF interface has special meaning for phandle 0.
152 fdt_offset_phandle(int offset)
156 return ((phandle_t)offset + fdt_off_dt_struct(fdtp));
160 fdt_phandle_offset(phandle_t p)
163 int dtoff = fdt_off_dt_struct(fdtp);
167 return (pint - dtoff);
170 /* Return the next sibling of this node or 0. */
172 ofw_fdt_peer(ofw_t ofw, phandle_t node)
178 offset = fdt_path_offset(fdtp, "/");
180 return (fdt_offset_phandle(offset));
183 offset = fdt_phandle_offset(node);
187 for (depth = 1, offset = fdt_next_node(fdtp, offset, &depth);
189 offset = fdt_next_node(fdtp, offset, &depth)) {
193 return (fdt_offset_phandle(offset));
199 /* Return the first child of this node or 0. */
201 ofw_fdt_child(ofw_t ofw, phandle_t node)
205 offset = fdt_phandle_offset(node);
209 for (depth = 0, offset = fdt_next_node(fdtp, offset, &depth);
210 (offset >= 0) && (depth > 0);
211 offset = fdt_next_node(fdtp, offset, &depth)) {
215 return (fdt_offset_phandle(offset));
221 /* Return the parent of this node or 0. */
223 ofw_fdt_parent(ofw_t ofw, phandle_t node)
225 int offset, paroffset;
227 offset = fdt_phandle_offset(node);
231 paroffset = fdt_parent_offset(fdtp, offset);
232 return (fdt_offset_phandle(paroffset));
235 /* Return the package handle that corresponds to an instance handle. */
237 ofw_fdt_instance_to_package(ofw_t ofw, ihandle_t instance)
240 /* Where real OF uses ihandles in the tree, FDT uses xref phandles */
241 return (OF_node_from_xref(instance));
244 /* Get the length of a property of a package. */
246 ofw_fdt_getproplen(ofw_t ofw, phandle_t package, const char *propname)
248 const struct fdt_property *prop;
251 offset = fdt_phandle_offset(package);
256 prop = fdt_get_property(fdtp, offset, propname, &len);
258 if (prop == NULL && strcmp(propname, "name") == 0) {
259 /* Emulate the 'name' property */
260 fdt_get_name(fdtp, offset, &len);
264 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
265 if (strcmp(propname, "fdtbootcpu") == 0)
266 return (sizeof(cell_t));
267 if (strcmp(propname, "fdtmemreserv") == 0)
268 return (sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp));
277 /* Get the value of a property of a package. */
279 ofw_fdt_getprop(ofw_t ofw, phandle_t package, const char *propname, void *buf,
287 offset = fdt_phandle_offset(package);
291 prop = fdt_getprop(fdtp, offset, propname, &len);
293 if (prop == NULL && strcmp(propname, "name") == 0) {
294 /* Emulate the 'name' property */
295 name = fdt_get_name(fdtp, offset, &len);
296 strncpy(buf, name, buflen);
297 if (len + 1 > buflen)
302 if (prop == NULL && offset == fdt_path_offset(fdtp, "/chosen")) {
303 if (strcmp(propname, "fdtbootcpu") == 0) {
304 cpuid = cpu_to_fdt32(fdt_boot_cpuid_phys(fdtp));
308 if (strcmp(propname, "fdtmemreserv") == 0) {
309 prop = (char *)fdtp + fdt_off_mem_rsvmap(fdtp);
310 len = sizeof(uint64_t)*2*fdt_num_mem_rsv(fdtp);
319 bcopy(prop, buf, len);
324 * Get the next property of a package. Return values:
325 * -1: package or previous property does not exist
326 * 0: no more properties
330 ofw_fdt_nextprop(ofw_t ofw, phandle_t package, const char *previous, char *buf,
333 const struct fdt_property *prop;
337 offset = fdt_phandle_offset(package);
341 /* Find the first prop in the node */
342 offset = fdt_first_property_offset(fdtp, offset);
344 return (0); /* No properties */
346 if (previous != NULL) {
347 while (offset >= 0) {
348 prop = fdt_get_property_by_offset(fdtp, offset, NULL);
350 return (-1); /* Internal error */
352 offset = fdt_next_property_offset(fdtp, offset);
354 return (0); /* No more properties */
356 /* Check if the last one was the one we wanted */
357 name = fdt_string(fdtp, fdt32_to_cpu(prop->nameoff));
358 if (strcmp(name, previous) == 0)
363 prop = fdt_get_property_by_offset(fdtp, offset, &offset);
365 return (-1); /* Internal error */
367 strncpy(buf, fdt_string(fdtp, fdt32_to_cpu(prop->nameoff)), size);
372 /* Set the value of a property of a package. */
374 ofw_fdt_setprop(ofw_t ofw, phandle_t package, const char *propname,
375 const void *buf, size_t len)
379 offset = fdt_phandle_offset(package);
383 return (fdt_setprop_inplace(fdtp, offset, propname, buf, len));
386 /* Convert a device specifier to a fully qualified pathname. */
388 ofw_fdt_canon(ofw_t ofw, const char *device, char *buf, size_t len)
394 /* Return a package handle for the specified device. */
396 ofw_fdt_finddevice(ofw_t ofw, const char *device)
400 offset = fdt_path_offset(fdtp, device);
403 return (fdt_offset_phandle(offset));
406 /* Return the fully qualified pathname corresponding to an instance. */
408 ofw_fdt_instance_to_path(ofw_t ofw, ihandle_t instance, char *buf, size_t len)
412 phandle = OF_instance_to_package(instance);
416 return (OF_package_to_path(phandle, buf, len));
419 /* Return the fully qualified pathname corresponding to a package. */
421 ofw_fdt_package_to_path(ofw_t ofw, phandle_t package, char *buf, size_t len)
427 #if defined(FDT_MARVELL) || defined(__powerpc__)
429 ofw_fdt_fixup(ofw_t ofw)
431 #define FDT_MODEL_LEN 80
432 char model[FDT_MODEL_LEN];
437 if ((root = ofw_fdt_finddevice(ofw, "/")) == -1)
440 if ((len = ofw_fdt_getproplen(ofw, root, "model")) <= 0)
443 bzero(model, FDT_MODEL_LEN);
444 if (ofw_fdt_getprop(ofw, root, "model", model, FDT_MODEL_LEN) <= 0)
448 * Search fixup table and call handler if appropriate.
450 for (i = 0; fdt_fixup_table[i].model != NULL; i++) {
451 if (strncmp(model, fdt_fixup_table[i].model,
455 if (fdt_fixup_table[i].handler != NULL)
456 (*fdt_fixup_table[i].handler)(root);
464 ofw_fdt_interpret(ofw_t ofw, const char *cmd, int nret, cell_t *retvals)
466 #if defined(FDT_MARVELL) || defined(__powerpc__)
470 * Note: FDT does not have the possibility to 'interpret' commands,
471 * but we abuse the interface a bit to use it for doing non-standard
472 * operations on the device tree blob.
474 * Currently the only supported 'command' is to trigger performing
477 if (strncmp("perform-fixup", cmd, 13) != 0)
480 rv = ofw_fdt_fixup(ofw);