summaryrefslogtreecommitdiffstats
path: root/common/state/backend_format_dtb.c
blob: 48f30db1f5f9e0ea0959c097ff4898f729c45c4e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*
 * Copyright (C) 2012-2014 Pengutronix, Jan Luebbe <j.luebbe@pengutronix.de>
 * Copyright (C) 2013-2014 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
 * Copyright (C) 2015 Pengutronix, Marc Kleine-Budde <mkl@pengutronix.de>
 * Copyright (C) 2016 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <common.h>
#include <of.h>
#include <linux/kernel.h>
#include <malloc.h>

#include "state.h"

struct state_backend_format_dtb {
	struct state_backend_format format;

	struct device_node *root;

	/* For outputs */
	struct device_d *dev;
};

static inline struct state_backend_format_dtb *get_format_dtb(struct
							      state_backend_format
							      *format)
{
	return container_of(format, struct state_backend_format_dtb, format);
}

static int state_backend_format_dtb_verify(struct state_backend_format *format,
					   uint32_t magic, const void * buf,
					   ssize_t *lenp, enum state_flags flags)
{
	struct state_backend_format_dtb *fdtb = get_format_dtb(format);
	struct device_node *root;
	struct fdt_header *fdt = (struct fdt_header *)buf;
	size_t dtb_len = fdt32_to_cpu(fdt->totalsize);
	size_t len = *lenp;

	if (dtb_len > len) {
		dev_err(fdtb->dev, "Error, stored DTB length (%zd) longer than read buffer (%zd)\n",
			dtb_len, len);
		return -EINVAL;
	}

	if (fdtb->root) {
		of_delete_node(fdtb->root);
		fdtb->root = NULL;
	}

	root = of_unflatten_dtb(buf);
	if (IS_ERR(root)) {
		dev_err(fdtb->dev, "Failed to unflatten dtb from buffer with length %zd, %ld\n",
			len, PTR_ERR(root));
		return PTR_ERR(root);
	}

	fdtb->root = root;

	*lenp = be32_to_cpu(fdt->totalsize);

	return 0;
}

static int state_backend_format_dtb_unpack(struct state_backend_format *format,
					   struct state *state,
					   const void * buf, ssize_t len)
{
	struct state_backend_format_dtb *fdtb = get_format_dtb(format);
	int ret;

	if (!fdtb->root) {
		state_backend_format_dtb_verify(format, 0, buf, &len, 0);
	}

	ret = state_from_node(state, fdtb->root, 0);
	of_delete_node(fdtb->root);
	fdtb->root = NULL;

	return ret;
}

static int state_backend_format_dtb_pack(struct state_backend_format *format,
					 struct state *state, void ** buf,
					 ssize_t * len)
{
	struct state_backend_format_dtb *fdtb = get_format_dtb(format);
	struct device_node *root;
	struct fdt_header *fdt;

	root = state_to_node(state, NULL, STATE_CONVERT_TO_NODE);
	if (IS_ERR(root)) {
		dev_err(fdtb->dev, "Failed to convert state to device node, %ld\n",
			PTR_ERR(root));
		return PTR_ERR(root);
	}

	fdt = of_flatten_dtb(root);
	if (!fdt) {
		dev_err(fdtb->dev, "Failed to create flattened dtb\n");
		of_delete_node(root);
		return -EINVAL;
	}

	*buf = (uint8_t *) fdt;
	*len = fdt32_to_cpu(fdt->totalsize);

	if (fdtb->root)
		of_delete_node(fdtb->root);
	fdtb->root = root;

	return 0;
}

static void state_backend_format_dtb_free(struct state_backend_format *format)
{
	struct state_backend_format_dtb *fdtb = get_format_dtb(format);

	free(fdtb);
}

int backend_format_dtb_create(struct state_backend_format **format,
			      struct device_d *dev)
{
	struct state_backend_format_dtb *dtb;

	dtb = xzalloc(sizeof(*dtb));

	dtb->dev = dev;
	dtb->format.pack = state_backend_format_dtb_pack;
	dtb->format.unpack = state_backend_format_dtb_unpack;
	dtb->format.verify = state_backend_format_dtb_verify;
	dtb->format.free = state_backend_format_dtb_free;
	dtb->format.name = "dtb";
	*format = &dtb->format;

	return 0;
}