uboot_fdt.c revision 346302 
1/*-
2 * Copyright (c) 2009-2010 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Semihalf under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: stable/11/stand/uboot/fdt/uboot_fdt.c 346302 2019-04-16 21:01:07Z kevans $");
32
33#include <sys/param.h>
34#include <stand.h>
35#include <fdt_platform.h>
36
37#include "glue.h"
38
39#define STR(number) #number
40#define STRINGIFY(number) STR(number)
41
42static int
43fdt_platform_load_from_ubenv(const char *var)
44{
45	struct fdt_header *hdr;
46	const char *s;
47	char *p;
48
49	s = ub_env_get(var);
50	if (s == NULL || *s == '\0')
51		return (1);
52
53	hdr = (struct fdt_header *)strtoul(s, &p, 16);
54	if (*p != '\0')
55		return (1);
56
57	if (fdt_load_dtb_addr(hdr) == 0) {
58		printf("Using DTB provided by U-Boot at "
59		    "address %p.\n", hdr);
60		return (0);
61	}
62
63	return (1);
64}
65
66int
67fdt_platform_load_dtb(void)
68{
69	struct fdt_header *hdr;
70	const char *s;
71	char *p;
72	int rv;
73
74	/*
75	 * If the U-boot environment contains a variable giving the address of a
76	 * valid blob in memory, use it.  The U-boot README says the right
77	 * variable for fdt data loaded into ram is fdt_addr_r, so try that
78	 * first.  Board vendors also use both fdtaddr and fdt_addr names.
79	 */
80	if ((rv = fdt_platform_load_from_ubenv("fdt_addr_r")) == 0)
81		goto exit;
82	if ((rv = fdt_platform_load_from_ubenv("fdt_addr")) == 0)
83		goto exit;
84	if ((rv = fdt_platform_load_from_ubenv("fdtaddr")) == 0)
85		goto exit;
86
87	rv = 1;
88
89	/*
90	 * Try to get FDT filename first from loader env and then from u-boot env
91	 */
92	s = getenv("fdt_file");
93	if (s == NULL)
94		s = ub_env_get("fdtfile");
95	if (s == NULL)
96		s = ub_env_get("fdt_file");
97	if (s != NULL && *s != '\0') {
98		if (fdt_load_dtb_file(s) == 0) {
99			printf("Loaded DTB from file '%s'.\n", s);
100			rv = 0;
101			goto exit;
102		}
103	}
104
105exit:
106	return (rv);
107}
108
109void
110fdt_platform_load_overlays(void)
111{
112
113	fdt_load_dtb_overlays(ub_env_get("fdt_overlays"));
114}
115
116void
117fdt_platform_fixups(void)
118{
119	static struct fdt_mem_region regions[UB_MAX_MR];
120	const char *env, *str;
121	char *end, *ethstr;
122	int eth_no, i, len, n;
123	struct sys_info *si;
124
125	env = NULL;
126	eth_no = 0;
127	ethstr = NULL;
128
129	/* Apply overlays before anything else */
130	fdt_apply_overlays();
131
132	/* Acquire sys_info */
133	si = ub_get_sys_info();
134
135	while ((env = ub_env_enum(env)) != NULL) {
136		if (strncmp(env, "eth", 3) == 0 &&
137		    strncmp(env + (strlen(env) - 4), "addr", 4) == 0) {
138			/*
139			 * Handle Ethernet addrs: parse uboot env eth%daddr
140			 */
141
142			if (!eth_no) {
143				/*
144				 * Check how many chars we will need to store
145				 * maximal eth iface number.
146				 */
147				len = strlen(STRINGIFY(TMP_MAX_ETH)) +
148				    strlen("ethernet") + 1;
149
150				/*
151				 * Reserve mem for string "ethernet" and len
152				 * chars for iface no.
153				 */
154				ethstr = (char *)malloc(len * sizeof(char));
155				bzero(ethstr, len * sizeof(char));
156				strcpy(ethstr, "ethernet0");
157			}
158
159			/* Extract interface number */
160			i = strtol(env + 3, &end, 10);
161			if (end == (env + 3))
162				/* 'ethaddr' means interface 0 address */
163				n = 0;
164			else
165				n = i;
166
167			if (n > TMP_MAX_ETH)
168				continue;
169
170			str = ub_env_get(env);
171
172			if (n != 0) {
173				/*
174				 * Find the length of the interface id by
175				 * taking in to account the first 3 and
176				 * last 4 characters.
177				 */
178				i = strlen(env) - 7;
179				strncpy(ethstr + 8, env + 3, i);
180			}
181
182			/* Modify blob */
183			fdt_fixup_ethernet(str, ethstr, len);
184
185			/* Clear ethernet..XXXX.. string */
186			bzero(ethstr + 8, len - 8);
187
188			if (n + 1 > eth_no)
189				eth_no = n + 1;
190		} else if (strcmp(env, "consoledev") == 0) {
191			str = ub_env_get(env);
192			fdt_fixup_stdout(str);
193		}
194	}
195
196	/* Modify cpu(s) and bus clock frequenties in /cpus node [Hz] */
197	fdt_fixup_cpubusfreqs(si->clk_cpu, si->clk_bus);
198
199	/* Extract the DRAM regions into fdt_mem_region format. */
200	for (i = 0, n = 0; i < si->mr_no && n < nitems(regions); i++) {
201		if (si->mr[i].flags == MR_ATTR_DRAM) {
202			regions[n].start = si->mr[i].start;
203			regions[n].size = si->mr[i].size;
204			n++;
205		}
206	}
207
208	/* Fixup memory regions */
209	fdt_fixup_memory(regions, n);
210}
211