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 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 */ 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_t)ULLONG_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 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 86 * 87 * Returns 0 on success, negative errno otherwise. 88 */ 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) 92 { 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; 107 108 if (!fw || !mem_region || !mem_phys || !mem_size) 109 return -EINVAL; 110 111 ehdr = (struct elf32_hdr *)fw->data; 112 phdrs = (struct elf32_phdr *)(ehdr + 1); 113 114 fw_name_len = strlen(firmware); 115 if (fw_name_len <= 4) 116 return -EINVAL; 117 118 fw_name = kstrdup(firmware, GFP_KERNEL); 119 if (!fw_name) 120 return -ENOMEM; 121 122 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; 126 } 127 128 for (i = 0; i < ehdr->e_phnum; i++) { 129 phdr = &phdrs[i]; 130 131 if (!mdt_phdr_valid(phdr)) 132 continue; 133 134 if (phdr->p_flags & QCOM_MDT_RELOCATABLE) 135 relocate = true; 136 137 if (phdr->p_paddr < min_addr) 138 min_addr = phdr->p_paddr; 139 140 if (phdr->p_paddr + phdr->p_memsz > max_addr) 141 max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K); 142 } 143 144 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; 149 } 150 151 /* 152 * The image is relocatable, so offset each segment based on 153 * the lowest segment address. 154 */ 155 mem_reloc = min_addr; 156 } else { 157 /* 158 * Image is not relocatable, so offset each segment based on 159 * the allocated physical chunk of memory. 160 */ 161 mem_reloc = mem_phys; 162 } 163 164 for (i = 0; i < ehdr->e_phnum; i++) { 165 phdr = &phdrs[i]; 166 167 if (!mdt_phdr_valid(phdr)) 168 continue; 169 170 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; 175 } 176 177 ptr = mem_region + offset; 178 179 if (phdr->p_filesz) { 180 sprintf(fw_name + fw_name_len - 3, "b%02d", i); 181 ret = request_firmware(&seg_fw, fw_name, dev); 182 if (ret) { 183 dev_err(dev, "failed to load %s\n", fw_name); 184 break; 185 } 186 187 memcpy(ptr, seg_fw->data, seg_fw->size); 188 189 release_firmware(seg_fw); 190 } 191 192 if (phdr->p_memsz > phdr->p_filesz) 193 memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz); 194 } 195 196 out: 197 kfree(fw_name); 198 199 return ret; 200 } 201 EXPORT_SYMBOL_GPL(qcom_mdt_load); 202 203 MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format"); 204 MODULE_LICENSE("GPL v2"); 205