Merge tag 'riscv-for-linus-4.15-rc2_cleanups' of git://git.kernel.org/pub/scm/linux...
[linux/fpc-iii.git] / drivers / soc / qcom / mdt_loader.c
blob08bd8549242a9d2445ac7aca845f716a97b54ac8
1 /*
2 * Qualcomm Peripheral Image Loader
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.
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.
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.
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>
28 static bool mdt_phdr_valid(const struct elf32_phdr *phdr)
30 if (phdr->p_type != PT_LOAD)
31 return false;
33 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
34 return false;
36 if (!phdr->p_memsz)
37 return false;
39 return true;
42 /**
43 * qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
44 * @fw: firmware object for the mdt file
46 * Returns size of the loaded firmware blob, or -EINVAL on failure.
48 ssize_t qcom_mdt_get_size(const struct firmware *fw)
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_t)ULLONG_MAX;
54 phys_addr_t max_addr = 0;
55 int i;
57 ehdr = (struct elf32_hdr *)fw->data;
58 phdrs = (struct elf32_phdr *)(ehdr + 1);
60 for (i = 0; i < ehdr->e_phnum; i++) {
61 phdr = &phdrs[i];
63 if (!mdt_phdr_valid(phdr))
64 continue;
66 if (phdr->p_paddr < min_addr)
67 min_addr = phdr->p_paddr;
69 if (phdr->p_paddr + phdr->p_memsz > max_addr)
70 max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
73 return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
75 EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
77 /**
78 * 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
87 * Returns 0 on success, negative errno otherwise.
89 int qcom_mdt_load(struct device *dev, const struct firmware *fw,
90 const char *firmware, int pas_id, void *mem_region,
91 phys_addr_t mem_phys, size_t mem_size)
93 const struct elf32_phdr *phdrs;
94 const struct elf32_phdr *phdr;
95 const struct elf32_hdr *ehdr;
96 const struct firmware *seg_fw;
97 phys_addr_t mem_reloc;
98 phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
99 phys_addr_t max_addr = 0;
100 size_t fw_name_len;
101 ssize_t offset;
102 char *fw_name;
103 bool relocate = false;
104 void *ptr;
105 int ret;
106 int i;
108 if (!fw || !mem_region || !mem_phys || !mem_size)
109 return -EINVAL;
111 ehdr = (struct elf32_hdr *)fw->data;
112 phdrs = (struct elf32_phdr *)(ehdr + 1);
114 fw_name_len = strlen(firmware);
115 if (fw_name_len <= 4)
116 return -EINVAL;
118 fw_name = kstrdup(firmware, GFP_KERNEL);
119 if (!fw_name)
120 return -ENOMEM;
122 ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
123 if (ret) {
124 dev_err(dev, "invalid firmware metadata\n");
125 goto out;
128 for (i = 0; i < ehdr->e_phnum; i++) {
129 phdr = &phdrs[i];
131 if (!mdt_phdr_valid(phdr))
132 continue;
134 if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
135 relocate = true;
137 if (phdr->p_paddr < min_addr)
138 min_addr = phdr->p_paddr;
140 if (phdr->p_paddr + phdr->p_memsz > max_addr)
141 max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
144 if (relocate) {
145 ret = qcom_scm_pas_mem_setup(pas_id, mem_phys, max_addr - min_addr);
146 if (ret) {
147 dev_err(dev, "unable to setup relocation\n");
148 goto out;
152 * The image is relocatable, so offset each segment based on
153 * the lowest segment address.
155 mem_reloc = min_addr;
156 } else {
158 * Image is not relocatable, so offset each segment based on
159 * the allocated physical chunk of memory.
161 mem_reloc = mem_phys;
164 for (i = 0; i < ehdr->e_phnum; i++) {
165 phdr = &phdrs[i];
167 if (!mdt_phdr_valid(phdr))
168 continue;
170 offset = phdr->p_paddr - mem_reloc;
171 if (offset < 0 || offset + phdr->p_memsz > mem_size) {
172 dev_err(dev, "segment outside memory range\n");
173 ret = -EINVAL;
174 break;
177 ptr = mem_region + offset;
179 if (phdr->p_filesz) {
180 sprintf(fw_name + fw_name_len - 3, "b%02d", i);
181 ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
182 ptr, phdr->p_filesz);
183 if (ret) {
184 dev_err(dev, "failed to load %s\n", fw_name);
185 break;
188 release_firmware(seg_fw);
191 if (phdr->p_memsz > phdr->p_filesz)
192 memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
195 out:
196 kfree(fw_name);
198 return ret;
200 EXPORT_SYMBOL_GPL(qcom_mdt_load);
202 MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
203 MODULE_LICENSE("GPL v2");