summaryrefslogtreecommitdiffstats
path: root/drivers/remoteproc/qcom_mdt_loader.c
blob: 114e8e4cef67adabc9bc7dd9fddde23bedd214df (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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
 * Qualcomm Peripheral Image Loader
 *
 * Copyright (C) 2016 Linaro Ltd
 * Copyright (C) 2015 Sony Mobile Communications Inc
 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
 *
 * 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 <linux/elf.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/remoteproc.h>
#include <linux/slab.h>

#include "remoteproc_internal.h"
#include "qcom_mdt_loader.h"

/**
 * qcom_mdt_find_rsc_table() - provide dummy resource table for remoteproc
 * @rproc:	remoteproc handle
 * @fw:		firmware header
 * @tablesz:	outgoing size of the table
 *
 * Returns a dummy table.
 */
struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc,
					       const struct firmware *fw,
					       int *tablesz)
{
	static struct resource_table table = { .ver = 1, };

	*tablesz = sizeof(table);
	return &table;
}
EXPORT_SYMBOL_GPL(qcom_mdt_find_rsc_table);

/**
 * qcom_mdt_parse() - extract useful parameters from the mdt header
 * @fw:		firmware handle
 * @fw_addr:	optional reference for base of the firmware's memory region
 * @fw_size:	optional reference for size of the firmware's memory region
 * @fw_relocate: optional reference for flagging if the firmware is relocatable
 *
 * Returns 0 on success, negative errno otherwise.
 */
int qcom_mdt_parse(const struct firmware *fw, phys_addr_t *fw_addr,
		   size_t *fw_size, bool *fw_relocate)
{
	const struct elf32_phdr *phdrs;
	const struct elf32_phdr *phdr;
	const struct elf32_hdr *ehdr;
	phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
	phys_addr_t max_addr = 0;
	bool relocate = false;
	int i;

	ehdr = (struct elf32_hdr *)fw->data;
	phdrs = (struct elf32_phdr *)(ehdr + 1);

	for (i = 0; i < ehdr->e_phnum; i++) {
		phdr = &phdrs[i];

		if (phdr->p_type != PT_LOAD)
			continue;

		if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
			continue;

		if (!phdr->p_memsz)
			continue;

		if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
			relocate = true;

		if (phdr->p_paddr < min_addr)
			min_addr = phdr->p_paddr;

		if (phdr->p_paddr + phdr->p_memsz > max_addr)
			max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
	}

	if (fw_addr)
		*fw_addr = min_addr;
	if (fw_size)
		*fw_size = max_addr - min_addr;
	if (fw_relocate)
		*fw_relocate = relocate;

	return 0;
}
EXPORT_SYMBOL_GPL(qcom_mdt_parse);

/**
 * qcom_mdt_load() - load the firmware which header is defined in fw
 * @rproc:	rproc handle
 * @fw:		frimware object for the header
 * @firmware:	filename of the firmware, for building .bXX names
 *
 * Returns 0 on success, negative errno otherwise.
 */
int qcom_mdt_load(struct rproc *rproc,
		  const struct firmware *fw,
		  const char *firmware)
{
	const struct elf32_phdr *phdrs;
	const struct elf32_phdr *phdr;
	const struct elf32_hdr *ehdr;
	size_t fw_name_len;
	char *fw_name;
	void *ptr;
	int ret;
	int i;

	ehdr = (struct elf32_hdr *)fw->data;
	phdrs = (struct elf32_phdr *)(ehdr + 1);

	fw_name_len = strlen(firmware);
	if (fw_name_len <= 4)
		return -EINVAL;

	fw_name = kstrdup(firmware, GFP_KERNEL);
	if (!fw_name)
		return -ENOMEM;

	for (i = 0; i < ehdr->e_phnum; i++) {
		phdr = &phdrs[i];

		if (phdr->p_type != PT_LOAD)
			continue;

		if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
			continue;

		if (!phdr->p_memsz)
			continue;

		ptr = rproc_da_to_va(rproc, phdr->p_paddr, phdr->p_memsz);
		if (!ptr) {
			dev_err(&rproc->dev, "segment outside memory range\n");
			ret = -EINVAL;
			break;
		}

		if (phdr->p_filesz) {
			sprintf(fw_name + fw_name_len - 3, "b%02d", i);
			ret = request_firmware(&fw, fw_name, &rproc->dev);
			if (ret) {
				dev_err(&rproc->dev, "failed to load %s\n",
					fw_name);
				break;
			}

			memcpy(ptr, fw->data, fw->size);

			release_firmware(fw);
		}

		if (phdr->p_memsz > phdr->p_filesz)
			memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
	}

	kfree(fw_name);

	return ret;
}
EXPORT_SYMBOL_GPL(qcom_mdt_load);

MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud