ofwfdt.c revision 279799 
1/*-
2 * Copyright (C) 2014-2015 Nathan Whitehorn
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: head/sys/boot/powerpc/ofw/ofwfdt.c 279799 2015-03-09 02:57:34Z nwhitehorn $");
28
29#include <stand.h>
30#include <sys/param.h>
31#include <fdt_platform.h>
32#include <openfirm.h>
33#include <libfdt.h>
34#include "bootstrap.h"
35
36static int
37OF_hasprop(phandle_t node, const char *prop)
38{
39	return (OF_getproplen(node, prop) > 0);
40}
41
42static void
43add_node_to_fdt(void *buffer, phandle_t node, int fdt_offset)
44{
45        int i, child_offset, error;
46        char name[2048], *lastprop, *subname;
47	void *propbuf;
48	size_t proplen;
49
50	lastprop = NULL;
51	while (OF_nextprop(node, lastprop, name) > 0) {
52		proplen = OF_getproplen(node, name);
53		propbuf = malloc(proplen);
54		OF_getprop(node, name, propbuf, proplen);
55		error = fdt_setprop(buffer, fdt_offset, name, propbuf, proplen);
56		free(propbuf);
57		lastprop = name;
58		if (error)
59			printf("Error %d adding property %s to "
60			    "node %d\n", error, name, fdt_offset);
61	}
62
63	if (!OF_hasprop(node, "phandle") && !OF_hasprop(node, "linux,phandle")
64	    && !OF_hasprop(node, "ibm,phandle"))
65		fdt_setprop(buffer, fdt_offset, "phandle", &node, sizeof(node));
66
67        for (node = OF_child(node); node > 0; node = OF_peer(node)) {
68		OF_package_to_path(node, name, sizeof(name));
69		subname = strrchr(name, '/');
70		subname++;
71		child_offset = fdt_add_subnode(buffer, fdt_offset, subname);
72		if (child_offset < 0) {
73			printf("Error %d adding node %s (%s), skipping\n",
74			    child_offset, name, subname);
75			continue;
76		}
77
78                add_node_to_fdt(buffer, node, child_offset);
79        }
80}
81
82static void
83ofwfdt_fixups(void *fdtp)
84{
85	int offset, len, i;
86	phandle_t node;
87	ihandle_t rtas;
88	const void *prop;
89
90	/*
91	 * Instantiate and add reservations for RTAS state if present
92	 */
93
94	offset = fdt_path_offset(fdtp, "/rtas");
95	if (offset > 0) {
96		uint32_t base;
97		void *rtasmem;
98		char path[255];
99
100		node = OF_finddevice("/rtas");
101		OF_package_to_path(node, path, sizeof(path));
102		OF_getprop(node, "rtas-size", &len, sizeof(len));
103
104		/* Allocate memory */
105		rtasmem = OF_claim(0, len, 4096);
106
107		/* Instantiate RTAS */
108		rtas = OF_open(path);
109		base = 0;
110		OF_call_method("instantiate-rtas", rtas, 1, 1, (cell_t)rtas,
111		    &base);
112
113		/* Store info to FDT using Linux convention */
114		base = cpu_to_fdt32(base);
115		fdt_setprop(fdtp, offset, "linux,rtas-entry", &base,
116		    sizeof(base));
117		base = cpu_to_fdt32((uint32_t)rtasmem);
118		offset = fdt_path_offset(fdtp, "/rtas");
119		fdt_setprop(fdtp, offset, "linux,rtas-base", &base,
120		    sizeof(base));
121
122		/* Mark RTAS private data area reserved */
123		fdt_add_mem_rsv(fdtp, base, len);
124	} else {
125		/*
126		 * Remove /memory/available properties, which reflect long-gone OF
127		 * state. Note that this doesn't work if we need RTAS still, since
128		 * that's part of the firmware.
129		 */
130
131		offset = fdt_path_offset(fdtp, "/memory@0");
132		if (offset > 0)
133			fdt_delprop(fdtp, offset, "available");
134	}
135
136	/*
137
138	/*
139	 * Convert stored ihandles under /chosen to xref phandles
140	 */
141	offset = fdt_path_offset(fdtp, "/chosen");
142	if (offset > 0) {
143		const char *chosenprops[] = {"stdout", "stdin", "mmu", "cpu",
144		    NULL};
145		const uint32_t *ihand;
146		for (i = 0; chosenprops[i] != NULL; i++) {
147			ihand = fdt_getprop(fdtp, offset, chosenprops[i], &len);
148			if (ihand != NULL && len == sizeof(*ihand)) {
149				node = OF_instance_to_package(
150				    fdt32_to_cpu(*ihand));
151				if (OF_hasprop(node, "phandle"))
152					OF_getprop(node, "phandle", &node,
153					    sizeof(node));
154				else if (OF_hasprop(node, "linux,phandle"))
155					OF_getprop(node, "linux,phandle", &node,
156					    sizeof(node));
157				else if (OF_hasprop(node, "ibm,phandle"))
158					OF_getprop(node, "ibm,phandle", &node,
159					    sizeof(node));
160				node = cpu_to_fdt32(node);
161				fdt_setprop(fdtp, offset, chosenprops[i], &node,				    sizeof(node));
162			}
163
164			/* Refind node in case it moved */
165			offset = fdt_path_offset(fdtp, "/chosen");
166		}
167	}
168}
169
170int
171fdt_platform_load_dtb(void)
172{
173        void *buffer;
174        size_t buflen = 409600;
175
176        buffer = malloc(buflen);
177        fdt_create_empty_tree(buffer, buflen);
178        add_node_to_fdt(buffer, OF_peer(0), fdt_path_offset(buffer, "/"));
179        ofwfdt_fixups(buffer);
180        fdt_pack(buffer);
181
182        fdt_load_dtb_addr(buffer);
183        free(buffer);
184
185        return (0);
186}
187
188void
189fdt_platform_fixups(void)
190{
191
192}
193
194static int
195command_fdt(int argc, char *argv[])
196{
197
198	return (command_fdt_internal(argc, argv));
199}
200
201COMMAND_SET(fdt, "fdt", "flattened device tree handling", command_fdt);
202
203