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Bjorn Andersson051fb702016-06-20 14:28:41 -07001/*
2 * Qualcomm Peripheral Image Loader
3 *
4 * Copyright (C) 2016 Linaro Ltd
5 * Copyright (C) 2015 Sony Mobile Communications Inc
6 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080018#include <linux/device.h>
Bjorn Andersson051fb702016-06-20 14:28:41 -070019#include <linux/elf.h>
20#include <linux/firmware.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080023#include <linux/qcom_scm.h>
Stanimir Varbanove67af182016-11-22 19:02:17 +020024#include <linux/sizes.h>
Bjorn Andersson051fb702016-06-20 14:28:41 -070025#include <linux/slab.h>
Bjorn Andersson2aad40d2017-01-27 03:12:57 -080026#include <linux/soc/qcom/mdt_loader.h>
Bjorn Andersson051fb702016-06-20 14:28:41 -070027
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080028static bool mdt_phdr_valid(const struct elf32_phdr *phdr)
29{
30 if (phdr->p_type != PT_LOAD)
31 return false;
32
33 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
34 return false;
35
36 if (!phdr->p_memsz)
37 return false;
38
39 return true;
40}
41
Bjorn Andersson051fb702016-06-20 14:28:41 -070042/**
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080043 * qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
44 * @fw: firmware object for the mdt file
Bjorn Andersson051fb702016-06-20 14:28:41 -070045 *
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080046 * Returns size of the loaded firmware blob, or -EINVAL on failure.
Bjorn Andersson051fb702016-06-20 14:28:41 -070047 */
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080048ssize_t qcom_mdt_get_size(const struct firmware *fw)
Bjorn Andersson051fb702016-06-20 14:28:41 -070049{
50 const struct elf32_phdr *phdrs;
51 const struct elf32_phdr *phdr;
52 const struct elf32_hdr *ehdr;
Stefan Agnerd7dc8992018-06-14 15:28:02 -070053 phys_addr_t min_addr = PHYS_ADDR_MAX;
Bjorn Andersson051fb702016-06-20 14:28:41 -070054 phys_addr_t max_addr = 0;
Bjorn Andersson051fb702016-06-20 14:28:41 -070055 int i;
56
57 ehdr = (struct elf32_hdr *)fw->data;
58 phdrs = (struct elf32_phdr *)(ehdr + 1);
59
60 for (i = 0; i < ehdr->e_phnum; i++) {
61 phdr = &phdrs[i];
62
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080063 if (!mdt_phdr_valid(phdr))
Bjorn Andersson051fb702016-06-20 14:28:41 -070064 continue;
65
Bjorn Andersson051fb702016-06-20 14:28:41 -070066 if (phdr->p_paddr < min_addr)
67 min_addr = phdr->p_paddr;
68
69 if (phdr->p_paddr + phdr->p_memsz > max_addr)
70 max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
71 }
72
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080073 return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
Bjorn Andersson051fb702016-06-20 14:28:41 -070074}
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080075EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
Bjorn Andersson051fb702016-06-20 14:28:41 -070076
77/**
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080078 * qcom_mdt_load() - load the firmware which header is loaded as fw
79 * @dev: device handle to associate resources with
80 * @fw: firmware object for the mdt file
81 * @firmware: name of the firmware, for construction of segment file names
82 * @pas_id: PAS identifier
83 * @mem_region: allocated memory region to load firmware into
84 * @mem_phys: physical address of allocated memory region
85 * @mem_size: size of the allocated memory region
Bjorn Andersson4dd27f52018-01-05 16:04:19 -080086 * @reloc_base: adjusted physical address after relocation
Bjorn Andersson051fb702016-06-20 14:28:41 -070087 *
88 * Returns 0 on success, negative errno otherwise.
89 */
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080090int qcom_mdt_load(struct device *dev, const struct firmware *fw,
91 const char *firmware, int pas_id, void *mem_region,
Bjorn Andersson4dd27f52018-01-05 16:04:19 -080092 phys_addr_t mem_phys, size_t mem_size,
93 phys_addr_t *reloc_base)
Bjorn Andersson051fb702016-06-20 14:28:41 -070094{
95 const struct elf32_phdr *phdrs;
96 const struct elf32_phdr *phdr;
97 const struct elf32_hdr *ehdr;
Bjorn Andersson3e8b5712017-01-27 02:06:36 -080098 const struct firmware *seg_fw;
Bjorn Andersson7f0dd072017-01-27 02:17:23 -080099 phys_addr_t mem_reloc;
Stefan Agnerd7dc8992018-06-14 15:28:02 -0700100 phys_addr_t min_addr = PHYS_ADDR_MAX;
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800101 phys_addr_t max_addr = 0;
Bjorn Andersson051fb702016-06-20 14:28:41 -0700102 size_t fw_name_len;
Bjorn Andersson01625cc52017-02-15 14:00:41 -0800103 ssize_t offset;
Bjorn Andersson051fb702016-06-20 14:28:41 -0700104 char *fw_name;
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800105 bool relocate = false;
Bjorn Andersson051fb702016-06-20 14:28:41 -0700106 void *ptr;
107 int ret;
108 int i;
109
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800110 if (!fw || !mem_region || !mem_phys || !mem_size)
111 return -EINVAL;
112
Bjorn Andersson051fb702016-06-20 14:28:41 -0700113 ehdr = (struct elf32_hdr *)fw->data;
114 phdrs = (struct elf32_phdr *)(ehdr + 1);
115
116 fw_name_len = strlen(firmware);
117 if (fw_name_len <= 4)
118 return -EINVAL;
119
120 fw_name = kstrdup(firmware, GFP_KERNEL);
121 if (!fw_name)
122 return -ENOMEM;
123
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800124 ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
125 if (ret) {
126 dev_err(dev, "invalid firmware metadata\n");
127 goto out;
128 }
129
Bjorn Andersson051fb702016-06-20 14:28:41 -0700130 for (i = 0; i < ehdr->e_phnum; i++) {
131 phdr = &phdrs[i];
132
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800133 if (!mdt_phdr_valid(phdr))
Bjorn Andersson051fb702016-06-20 14:28:41 -0700134 continue;
135
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800136 if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
137 relocate = true;
138
139 if (phdr->p_paddr < min_addr)
140 min_addr = phdr->p_paddr;
141
142 if (phdr->p_paddr + phdr->p_memsz > max_addr)
143 max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
144 }
145
146 if (relocate) {
147 ret = qcom_scm_pas_mem_setup(pas_id, mem_phys, max_addr - min_addr);
148 if (ret) {
149 dev_err(dev, "unable to setup relocation\n");
150 goto out;
151 }
152
153 /*
154 * The image is relocatable, so offset each segment based on
155 * the lowest segment address.
156 */
157 mem_reloc = min_addr;
158 } else {
159 /*
160 * Image is not relocatable, so offset each segment based on
161 * the allocated physical chunk of memory.
162 */
163 mem_reloc = mem_phys;
164 }
165
166 for (i = 0; i < ehdr->e_phnum; i++) {
167 phdr = &phdrs[i];
168
169 if (!mdt_phdr_valid(phdr))
Bjorn Andersson051fb702016-06-20 14:28:41 -0700170 continue;
171
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800172 offset = phdr->p_paddr - mem_reloc;
173 if (offset < 0 || offset + phdr->p_memsz > mem_size) {
174 dev_err(dev, "segment outside memory range\n");
Bjorn Andersson051fb702016-06-20 14:28:41 -0700175 ret = -EINVAL;
176 break;
177 }
178
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800179 ptr = mem_region + offset;
180
Bjorn Andersson051fb702016-06-20 14:28:41 -0700181 if (phdr->p_filesz) {
182 sprintf(fw_name + fw_name_len - 3, "b%02d", i);
Bjorn Andersson445c2412017-06-26 13:36:59 -0700183 ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
184 ptr, phdr->p_filesz);
Bjorn Andersson051fb702016-06-20 14:28:41 -0700185 if (ret) {
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800186 dev_err(dev, "failed to load %s\n", fw_name);
Bjorn Andersson051fb702016-06-20 14:28:41 -0700187 break;
188 }
189
Bjorn Andersson3e8b5712017-01-27 02:06:36 -0800190 release_firmware(seg_fw);
Bjorn Andersson051fb702016-06-20 14:28:41 -0700191 }
192
193 if (phdr->p_memsz > phdr->p_filesz)
194 memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
195 }
196
Bjorn Andersson4dd27f52018-01-05 16:04:19 -0800197 if (reloc_base)
198 *reloc_base = mem_reloc;
199
Bjorn Andersson7f0dd072017-01-27 02:17:23 -0800200out:
Bjorn Andersson051fb702016-06-20 14:28:41 -0700201 kfree(fw_name);
202
203 return ret;
204}
205EXPORT_SYMBOL_GPL(qcom_mdt_load);
206
207MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
208MODULE_LICENSE("GPL v2");