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_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 * @reloc_base: adjusted physical address after relocation 87 * 88 * Returns 0 on success, negative errno otherwise. 89 */ 90 int qcom_mdt_load(struct device *dev, const struct firmware *fw, 91 const char *firmware, int pas_id, void *mem_region, 92 phys_addr_t mem_phys, size_t mem_size, 93 phys_addr_t *reloc_base) 94 { 95 const struct elf32_phdr *phdrs; 96 const struct elf32_phdr *phdr; 97 const struct elf32_hdr *ehdr; 98 const struct firmware *seg_fw; 99 phys_addr_t mem_reloc; 100 phys_addr_t min_addr = PHYS_ADDR_MAX; 101 phys_addr_t max_addr = 0; 102 size_t fw_name_len; 103 ssize_t offset; 104 char *fw_name; 105 bool relocate = false; 106 void *ptr; 107 int ret; 108 int i; 109 110 if (!fw || !mem_region || !mem_phys || !mem_size) 111 return -EINVAL; 112 113 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; 123 124 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 } 129 130 for (i = 0; i < ehdr->e_phnum; i++) { 131 phdr = &phdrs[i]; 132 133 if (!mdt_phdr_valid(phdr)) 134 continue; 135 136 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)) 170 continue; 171 172 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"); 175 ret = -EINVAL; 176 break; 177 } 178 179 ptr = mem_region + offset; 180 181 if (phdr->p_filesz) { 182 sprintf(fw_name + fw_name_len - 3, "b%02d", i); 183 ret = request_firmware_into_buf(&seg_fw, fw_name, dev, 184 ptr, phdr->p_filesz); 185 if (ret) { 186 dev_err(dev, "failed to load %s\n", fw_name); 187 break; 188 } 189 190 release_firmware(seg_fw); 191 } 192 193 if (phdr->p_memsz > phdr->p_filesz) 194 memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz); 195 } 196 197 if (reloc_base) 198 *reloc_base = mem_reloc; 199 200 out: 201 kfree(fw_name); 202 203 return ret; 204 } 205 EXPORT_SYMBOL_GPL(qcom_mdt_load); 206 207 MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format"); 208 MODULE_LICENSE("GPL v2"); 209