linux/drivers/soc/qcom/mdt_loader.c
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   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
  28static 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 */
  48ssize_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}
  75EXPORT_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 */
  89int 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_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;
 186                        }
 187
 188                        release_firmware(seg_fw);
 189                }
 190
 191                if (phdr->p_memsz > phdr->p_filesz)
 192                        memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
 193        }
 194
 195out:
 196        kfree(fw_name);
 197
 198        return ret;
 199}
 200EXPORT_SYMBOL_GPL(qcom_mdt_load);
 201
 202MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
 203MODULE_LICENSE("GPL v2");
 204