qcom_mdt_loader.c
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/*
* Qualcomm Peripheral Image Loader
*
* Copyright (C) 2016 Linaro Ltd
* Copyright (C) 2015 Sony Mobile Communications Inc
* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/elf.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/remoteproc.h>
#include <linux/slab.h>
#include "remoteproc_internal.h"
#include "qcom_mdt_loader.h"
/**
* qcom_mdt_find_rsc_table() - provide dummy resource table for remoteproc
* @rproc: remoteproc handle
* @fw: firmware header
* @tablesz: outgoing size of the table
*
* Returns a dummy table.
*/
struct resource_table *qcom_mdt_find_rsc_table(struct rproc *rproc,
const struct firmware *fw,
int *tablesz)
{
static struct resource_table table = { .ver = 1, };
*tablesz = sizeof(table);
return &table;
}
EXPORT_SYMBOL_GPL(qcom_mdt_find_rsc_table);
/**
* qcom_mdt_parse() - extract useful parameters from the mdt header
* @fw: firmware handle
* @fw_addr: optional reference for base of the firmware's memory region
* @fw_size: optional reference for size of the firmware's memory region
* @fw_relocate: optional reference for flagging if the firmware is relocatable
*
* Returns 0 on success, negative errno otherwise.
*/
int qcom_mdt_parse(const struct firmware *fw, phys_addr_t *fw_addr,
size_t *fw_size, bool *fw_relocate)
{
const struct elf32_phdr *phdrs;
const struct elf32_phdr *phdr;
const struct elf32_hdr *ehdr;
phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
phys_addr_t max_addr = 0;
bool relocate = false;
int i;
ehdr = (struct elf32_hdr *)fw->data;
phdrs = (struct elf32_phdr *)(ehdr + 1);
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (phdr->p_type != PT_LOAD)
continue;
if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
continue;
if (!phdr->p_memsz)
continue;
if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
relocate = true;
if (phdr->p_paddr < min_addr)
min_addr = phdr->p_paddr;
if (phdr->p_paddr + phdr->p_memsz > max_addr)
max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
}
if (fw_addr)
*fw_addr = min_addr;
if (fw_size)
*fw_size = max_addr - min_addr;
if (fw_relocate)
*fw_relocate = relocate;
return 0;
}
EXPORT_SYMBOL_GPL(qcom_mdt_parse);
/**
* qcom_mdt_load() - load the firmware which header is defined in fw
* @rproc: rproc handle
* @fw: frimware object for the header
* @firmware: filename of the firmware, for building .bXX names
*
* Returns 0 on success, negative errno otherwise.
*/
int qcom_mdt_load(struct rproc *rproc,
const struct firmware *fw,
const char *firmware)
{
const struct elf32_phdr *phdrs;
const struct elf32_phdr *phdr;
const struct elf32_hdr *ehdr;
size_t fw_name_len;
char *fw_name;
void *ptr;
int ret;
int i;
ehdr = (struct elf32_hdr *)fw->data;
phdrs = (struct elf32_phdr *)(ehdr + 1);
fw_name_len = strlen(firmware);
if (fw_name_len <= 4)
return -EINVAL;
fw_name = kstrdup(firmware, GFP_KERNEL);
if (!fw_name)
return -ENOMEM;
for (i = 0; i < ehdr->e_phnum; i++) {
phdr = &phdrs[i];
if (phdr->p_type != PT_LOAD)
continue;
if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
continue;
if (!phdr->p_memsz)
continue;
ptr = rproc_da_to_va(rproc, phdr->p_paddr, phdr->p_memsz);
if (!ptr) {
dev_err(&rproc->dev, "segment outside memory range\n");
ret = -EINVAL;
break;
}
if (phdr->p_filesz) {
sprintf(fw_name + fw_name_len - 3, "b%02d", i);
ret = request_firmware(&fw, fw_name, &rproc->dev);
if (ret) {
dev_err(&rproc->dev, "failed to load %s\n",
fw_name);
break;
}
memcpy(ptr, fw->data, fw->size);
release_firmware(fw);
}
if (phdr->p_memsz > phdr->p_filesz)
memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
}
kfree(fw_name);
return ret;
}
EXPORT_SYMBOL_GPL(qcom_mdt_load);
MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
MODULE_LICENSE("GPL v2");