drivers/remoteproc/qcom_mdt_loader.c

   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/elf.h>
  19 #include <linux/firmware.h>
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/remoteproc.h>
  23 #include <linux/slab.h>
  24
  25 #include "remoteproc_internal.h"
  26 #include "qcom_mdt_loader.h"
  27
  28 /**
  29  * qcom_mdt_find_rsc_table() - provide dummy resource table for remoteproc
  30  * @rproc:      remoteproc handle
  31  * @fw:         firmware header
  32  * @tablesz:    outgoing size of the table
  33  *
  34  * Returns a dummy table.
  35  */
  36 struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc,
  37                                                const struct firmware *fw,
  38                                                int *tablesz)
  39 {
  40         static struct resource_table table = { .ver = 1, };
  41
  42         *tablesz = sizeof(table);
  43         return &table;
  44 }
  45 EXPORT_SYMBOL_GPL(qcom_mdt_find_rsc_table);
  46
  47 /**
  48  * qcom_mdt_parse() - extract useful parameters from the mdt header
  49  * @fw:         firmware handle
  50  * @fw_addr:    optional reference for base of the firmware's memory region
  51  * @fw_size:    optional reference for size of the firmware's memory region
  52  * @fw_relocate: optional reference for flagging if the firmware is relocatable
  53  *
  54  * Returns 0 on success, negative errno otherwise.
  55  */
  56 int qcom_mdt_parse(const struct firmware *fw, phys_addr_t *fw_addr,
  57                    size_t *fw_size, bool *fw_relocate)
  58 {
  59         const struct elf32_phdr *phdrs;
  60         const struct elf32_phdr *phdr;
  61         const struct elf32_hdr *ehdr;
  62         phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
  63         phys_addr_t max_addr = 0;
  64         bool relocate = false;
  65         int i;
  66
  67         ehdr = (struct elf32_hdr *)fw->data;
  68         phdrs = (struct elf32_phdr *)(ehdr + 1);
  69
  70         for (i = 0; i < ehdr->e_phnum; i++) {
  71                 phdr = &phdrs[i];
  72
  73                 if (phdr->p_type != PT_LOAD)
  74                         continue;
  75
  76                 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
  77                         continue;
  78
  79                 if (!phdr->p_memsz)
  80                         continue;
  81
  82                 if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
  83                         relocate = true;
  84
  85                 if (phdr->p_paddr < min_addr)
  86                         min_addr = phdr->p_paddr;
  87
  88                 if (phdr->p_paddr + phdr->p_memsz > max_addr)
  89                         max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
  90         }
  91
  92         if (fw_addr)
  93                 *fw_addr = min_addr;
  94         if (fw_size)
  95                 *fw_size = max_addr - min_addr;
  96         if (fw_relocate)
  97                 *fw_relocate = relocate;
  98
  99         return 0;
 100 }
 101 EXPORT_SYMBOL_GPL(qcom_mdt_parse);
 102
 103 /**
 104  * qcom_mdt_load() - load the firmware which header is defined in fw
 105  * @rproc:      rproc handle
 106  * @fw:         frimware object for the header
 107  * @firmware:   filename of the firmware, for building .bXX names
 108  *
 109  * Returns 0 on success, negative errno otherwise.
 110  */
 111 int qcom_mdt_load(struct rproc *rproc,
 112                   const struct firmware *fw,
 113                   const char *firmware)
 114 {
 115         const struct elf32_phdr *phdrs;
 116         const struct elf32_phdr *phdr;
 117         const struct elf32_hdr *ehdr;
 118         size_t fw_name_len;
 119         char *fw_name;
 120         void *ptr;
 121         int ret;
 122         int i;
 123
 124         ehdr = (struct elf32_hdr *)fw->data;
 125         phdrs = (struct elf32_phdr *)(ehdr + 1);
 126
 127         fw_name_len = strlen(firmware);
 128         if (fw_name_len <= 4)
 129                 return -EINVAL;
 130
 131         fw_name = kstrdup(firmware, GFP_KERNEL);
 132         if (!fw_name)
 133                 return -ENOMEM;
 134
 135         for (i = 0; i < ehdr->e_phnum; i++) {
 136                 phdr = &phdrs[i];
 137
 138                 if (phdr->p_type != PT_LOAD)
 139                         continue;
 140
 141                 if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
 142                         continue;
 143
 144                 if (!phdr->p_memsz)
 145                         continue;
 146
 147                 ptr = rproc_da_to_va(rproc, phdr->p_paddr, phdr->p_memsz);
 148                 if (!ptr) {
 149                         dev_err(&rproc->dev, "segment outside memory range\n");
 150                         ret = -EINVAL;
 151                         break;
 152                 }
 153
 154                 if (phdr->p_filesz) {
 155                         sprintf(fw_name + fw_name_len - 3, "b%02d", i);
 156                         ret = request_firmware(&fw, fw_name, &rproc->dev);
 157                         if (ret) {
 158                                 dev_err(&rproc->dev, "failed to load %s\n",
 159                                         fw_name);
 160                                 break;
 161                         }
 162
 163                         memcpy(ptr, fw->data, fw->size);
 164
 165                         release_firmware(fw);
 166                 }
 167
 168                 if (phdr->p_memsz > phdr->p_filesz)
 169                         memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
 170         }
 171
 172         kfree(fw_name);
 173
 174         return ret;
 175 }
 176 EXPORT_SYMBOL_GPL(qcom_mdt_load);
 177
 178 MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
 179 MODULE_LICENSE("GPL v2");