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