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 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 */ 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 */ 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