uboot_fdt.c revision 283409 
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/10/sys/boot/uboot/fdt/uboot_fdt.c 283409 2015-05-24 15:29:56Z ian $");
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
42int
43fdt_platform_load_dtb(void)
44{
45	struct fdt_header *hdr;
46	const char *s;
47	char *p;
48
49	/*
50	 * If the U-boot environment contains a variable giving the address of a
51	 * valid blob in memory, use it.  The U-boot README says the right
52	 * variable for fdt data loaded into ram is fdt_addr_r, so try that
53	 * first.  Board vendors also use both fdtaddr and fdt_addr names.
54	 */
55	s = ub_env_get("fdt_addr_r");
56	if (s == NULL)
57		s = ub_env_get("fdtaddr");
58	if (s == NULL)
59		s = ub_env_get("fdt_addr");
60	if (s != NULL && *s != '\0') {
61		hdr = (struct fdt_header *)strtoul(s, &p, 16);
62		if (*p == '\0') {
63			if (fdt_load_dtb_addr(hdr) == 0) {
64				printf("Using DTB provided by U-Boot at "
65				    "address %p.\n", hdr);
66				return (0);
67			}
68		}
69	}
70
71	/*
72	 * If the U-boot environment contains a variable giving the name of a
73	 * file, use it if we can load and validate it.
74	 */
75	s = ub_env_get("fdtfile");
76	if (s == NULL)
77		s = ub_env_get("fdt_file");
78	if (s != NULL && *s != '\0') {
79		if (fdt_load_dtb_file(s) == 0) {
80			printf("Loaded DTB from file '%s'.\n", s);
81			return (0);
82		}
83	}
84
85	return (1);
86}
87
88void
89fdt_platform_fixups(void)
90{
91	static struct fdt_mem_region regions[UB_MAX_MR];
92	const char *env, *str;
93	char *end, *ethstr;
94	int eth_no, i, len, n;
95	struct sys_info *si;
96
97	env = NULL;
98	eth_no = 0;
99	ethstr = NULL;
100
101	/* Acquire sys_info */
102	si = ub_get_sys_info();
103
104	while ((env = ub_env_enum(env)) != NULL) {
105		if (strncmp(env, "eth", 3) == 0 &&
106		    strncmp(env + (strlen(env) - 4), "addr", 4) == 0) {
107			/*
108			 * Handle Ethernet addrs: parse uboot env eth%daddr
109			 */
110
111			if (!eth_no) {
112				/*
113				 * Check how many chars we will need to store
114				 * maximal eth iface number.
115				 */
116				len = strlen(STRINGIFY(TMP_MAX_ETH)) +
117				    strlen("ethernet") + 1;
118
119				/*
120				 * Reserve mem for string "ethernet" and len
121				 * chars for iface no.
122				 */
123				ethstr = (char *)malloc(len * sizeof(char));
124				bzero(ethstr, len * sizeof(char));
125				strcpy(ethstr, "ethernet0");
126			}
127
128			/* Extract interface number */
129			i = strtol(env + 3, &end, 10);
130			if (end == (env + 3))
131				/* 'ethaddr' means interface 0 address */
132				n = 0;
133			else
134				n = i;
135
136			if (n > TMP_MAX_ETH)
137				continue;
138
139			str = ub_env_get(env);
140
141			if (n != 0) {
142				/*
143				 * Find the lenght of the interface id by
144				 * taking in to account the first 3 and
145				 * last 4 characters.
146				 */
147				i = strlen(env) - 7;
148				strncpy(ethstr + 8, env + 3, i);
149			}
150
151			/* Modify blob */
152			fdt_fixup_ethernet(str, ethstr, len);
153
154			/* Clear ethernet..XXXX.. string */
155			bzero(ethstr + 8, len - 8);
156
157			if (n + 1 > eth_no)
158				eth_no = n + 1;
159		} else if (strcmp(env, "consoledev") == 0) {
160			str = ub_env_get(env);
161			fdt_fixup_stdout(str);
162		}
163	}
164
165	/* Modify cpu(s) and bus clock frequenties in /cpus node [Hz] */
166	fdt_fixup_cpubusfreqs(si->clk_cpu, si->clk_bus);
167
168	/* Extract the DRAM regions into fdt_mem_region format. */
169	for (i = 0, n = 0; i < si->mr_no && n < nitems(regions); i++) {
170		if (si->mr[i].flags == MR_ATTR_DRAM) {
171			regions[n].start = si->mr[i].start;
172			regions[n].size = si->mr[i].size;
173			n++;
174		}
175	}
176
177	/* Fixup memory regions */
178	fdt_fixup_memory(regions, n);
179}
180