1 /*
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
18 #include <linux/device.h>
19 #include <linux/elf.h>
20 #include <linux/firmware.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/qcom_scm.h>
24 #include <linux/sizes.h>
25 #include <linux/slab.h>
26 #include <linux/soc/qcom/mdt_loader.h>
27
mdt_phdr_valid(const struct elf32_phdr * phdr)28 static 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
42 /**
43 * qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
44 * @fw: firmware object for the mdt file
45 *
46 * Returns size of the loaded firmware blob, or -EINVAL on failure.
47 */
qcom_mdt_get_size(const struct firmware * fw)48 ssize_t qcom_mdt_get_size(const struct firmware *fw)
49 {
50 const struct elf32_phdr *phdrs;
51 const struct elf32_phdr *phdr;
52 const struct elf32_hdr *ehdr;
53 phys_addr_t min_addr = PHYS_ADDR_MAX;
54 phys_addr_t max_addr = 0;
55 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
63 if (!mdt_phdr_valid(phdr))
64 continue;
65
66 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
73 return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
74 }
75 EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
76
__qcom_mdt_load(struct device * dev,const struct firmware * fw,const char * firmware,int pas_id,void * mem_region,phys_addr_t mem_phys,size_t mem_size,phys_addr_t * reloc_base,bool pas_init)77 static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
78 const char *firmware, int pas_id, void *mem_region,
79 phys_addr_t mem_phys, size_t mem_size,
80 phys_addr_t *reloc_base, bool pas_init)
81 {
82 const struct elf32_phdr *phdrs;
83 const struct elf32_phdr *phdr;
84 const struct elf32_hdr *ehdr;
85 const struct firmware *seg_fw;
86 phys_addr_t mem_reloc;
87 phys_addr_t min_addr = PHYS_ADDR_MAX;
88 phys_addr_t max_addr = 0;
89 size_t fw_name_len;
90 ssize_t offset;
91 char *fw_name;
92 bool relocate = false;
93 void *ptr;
94 int ret;
95 int i;
96
97 if (!fw || !mem_region || !mem_phys || !mem_size)
98 return -EINVAL;
99
100 ehdr = (struct elf32_hdr *)fw->data;
101 phdrs = (struct elf32_phdr *)(ehdr + 1);
102
103 fw_name_len = strlen(firmware);
104 if (fw_name_len <= 4)
105 return -EINVAL;
106
107 fw_name = kstrdup(firmware, GFP_KERNEL);
108 if (!fw_name)
109 return -ENOMEM;
110
111 if (pas_init) {
112 ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
113 if (ret) {
114 dev_err(dev, "invalid firmware metadata\n");
115 goto out;
116 }
117 }
118
119 for (i = 0; i < ehdr->e_phnum; i++) {
120 phdr = &phdrs[i];
121
122 if (!mdt_phdr_valid(phdr))
123 continue;
124
125 if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
126 relocate = true;
127
128 if (phdr->p_paddr < min_addr)
129 min_addr = phdr->p_paddr;
130
131 if (phdr->p_paddr + phdr->p_memsz > max_addr)
132 max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
133 }
134
135 if (relocate) {
136 if (pas_init) {
137 ret = qcom_scm_pas_mem_setup(pas_id, mem_phys,
138 max_addr - min_addr);
139 if (ret) {
140 dev_err(dev, "unable to setup relocation\n");
141 goto out;
142 }
143 }
144
145 /*
146 * The image is relocatable, so offset each segment based on
147 * the lowest segment address.
148 */
149 mem_reloc = min_addr;
150 } else {
151 /*
152 * Image is not relocatable, so offset each segment based on
153 * the allocated physical chunk of memory.
154 */
155 mem_reloc = mem_phys;
156 }
157
158 for (i = 0; i < ehdr->e_phnum; i++) {
159 phdr = &phdrs[i];
160
161 if (!mdt_phdr_valid(phdr))
162 continue;
163
164 offset = phdr->p_paddr - mem_reloc;
165 if (offset < 0 || offset + phdr->p_memsz > mem_size) {
166 dev_err(dev, "segment outside memory range\n");
167 ret = -EINVAL;
168 break;
169 }
170
171 ptr = mem_region + offset;
172
173 if (phdr->p_filesz) {
174 sprintf(fw_name + fw_name_len - 3, "b%02d", i);
175 ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
176 ptr, phdr->p_filesz);
177 if (ret) {
178 dev_err(dev, "failed to load %s\n", fw_name);
179 break;
180 }
181
182 release_firmware(seg_fw);
183 }
184
185 if (phdr->p_memsz > phdr->p_filesz)
186 memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
187 }
188
189 if (reloc_base)
190 *reloc_base = mem_reloc;
191
192 out:
193 kfree(fw_name);
194
195 return ret;
196 }
197
198 /**
199 * qcom_mdt_load() - load the firmware which header is loaded as fw
200 * @dev: device handle to associate resources with
201 * @fw: firmware object for the mdt file
202 * @firmware: name of the firmware, for construction of segment file names
203 * @pas_id: PAS identifier
204 * @mem_region: allocated memory region to load firmware into
205 * @mem_phys: physical address of allocated memory region
206 * @mem_size: size of the allocated memory region
207 * @reloc_base: adjusted physical address after relocation
208 *
209 * Returns 0 on success, negative errno otherwise.
210 */
qcom_mdt_load(struct device * dev,const struct firmware * fw,const char * firmware,int pas_id,void * mem_region,phys_addr_t mem_phys,size_t mem_size,phys_addr_t * reloc_base)211 int qcom_mdt_load(struct device *dev, const struct firmware *fw,
212 const char *firmware, int pas_id, void *mem_region,
213 phys_addr_t mem_phys, size_t mem_size,
214 phys_addr_t *reloc_base)
215 {
216 return __qcom_mdt_load(dev, fw, firmware, pas_id, mem_region, mem_phys,
217 mem_size, reloc_base, true);
218 }
219 EXPORT_SYMBOL_GPL(qcom_mdt_load);
220
221 /**
222 * qcom_mdt_load_no_init() - load the firmware which header is loaded as fw
223 * @dev: device handle to associate resources with
224 * @fw: firmware object for the mdt file
225 * @firmware: name of the firmware, for construction of segment file names
226 * @pas_id: PAS identifier
227 * @mem_region: allocated memory region to load firmware into
228 * @mem_phys: physical address of allocated memory region
229 * @mem_size: size of the allocated memory region
230 * @reloc_base: adjusted physical address after relocation
231 *
232 * Returns 0 on success, negative errno otherwise.
233 */
qcom_mdt_load_no_init(struct device * dev,const struct firmware * fw,const char * firmware,int pas_id,void * mem_region,phys_addr_t mem_phys,size_t mem_size,phys_addr_t * reloc_base)234 int qcom_mdt_load_no_init(struct device *dev, const struct firmware *fw,
235 const char *firmware, int pas_id,
236 void *mem_region, phys_addr_t mem_phys,
237 size_t mem_size, phys_addr_t *reloc_base)
238 {
239 return __qcom_mdt_load(dev, fw, firmware, pas_id, mem_region, mem_phys,
240 mem_size, reloc_base, false);
241 }
242 EXPORT_SYMBOL_GPL(qcom_mdt_load_no_init);
243
244 MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
245 MODULE_LICENSE("GPL v2");
246
