209 lines
5.1 KiB
C
209 lines
5.1 KiB
C
/*
|
|
* 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/device.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/firmware.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/qcom_scm.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/soc/qcom/mdt_loader.h>
|
|
|
|
static bool mdt_phdr_valid(const struct elf32_phdr *phdr)
|
|
{
|
|
if (phdr->p_type != PT_LOAD)
|
|
return false;
|
|
|
|
if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
|
|
return false;
|
|
|
|
if (!phdr->p_memsz)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
|
|
* @fw: firmware object for the mdt file
|
|
*
|
|
* Returns size of the loaded firmware blob, or -EINVAL on failure.
|
|
*/
|
|
ssize_t qcom_mdt_get_size(const struct firmware *fw)
|
|
{
|
|
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;
|
|
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 (!mdt_phdr_valid(phdr))
|
|
continue;
|
|
|
|
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);
|
|
}
|
|
|
|
return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
|
|
|
|
/**
|
|
* qcom_mdt_load() - load the firmware which header is loaded as fw
|
|
* @dev: device handle to associate resources with
|
|
* @fw: firmware object for the mdt file
|
|
* @firmware: name of the firmware, for construction of segment file names
|
|
* @pas_id: PAS identifier
|
|
* @mem_region: allocated memory region to load firmware into
|
|
* @mem_phys: physical address of allocated memory region
|
|
* @mem_size: size of the allocated memory region
|
|
* @reloc_base: adjusted physical address after relocation
|
|
*
|
|
* Returns 0 on success, negative errno otherwise.
|
|
*/
|
|
int qcom_mdt_load(struct device *dev, const struct firmware *fw,
|
|
const char *firmware, int pas_id, void *mem_region,
|
|
phys_addr_t mem_phys, size_t mem_size,
|
|
phys_addr_t *reloc_base)
|
|
{
|
|
const struct elf32_phdr *phdrs;
|
|
const struct elf32_phdr *phdr;
|
|
const struct elf32_hdr *ehdr;
|
|
const struct firmware *seg_fw;
|
|
phys_addr_t mem_reloc;
|
|
phys_addr_t min_addr = (phys_addr_t)ULLONG_MAX;
|
|
phys_addr_t max_addr = 0;
|
|
size_t fw_name_len;
|
|
ssize_t offset;
|
|
char *fw_name;
|
|
bool relocate = false;
|
|
void *ptr;
|
|
int ret;
|
|
int i;
|
|
|
|
if (!fw || !mem_region || !mem_phys || !mem_size)
|
|
return -EINVAL;
|
|
|
|
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;
|
|
|
|
ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
|
|
if (ret) {
|
|
dev_err(dev, "invalid firmware metadata\n");
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < ehdr->e_phnum; i++) {
|
|
phdr = &phdrs[i];
|
|
|
|
if (!mdt_phdr_valid(phdr))
|
|
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 (relocate) {
|
|
ret = qcom_scm_pas_mem_setup(pas_id, mem_phys, max_addr - min_addr);
|
|
if (ret) {
|
|
dev_err(dev, "unable to setup relocation\n");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The image is relocatable, so offset each segment based on
|
|
* the lowest segment address.
|
|
*/
|
|
mem_reloc = min_addr;
|
|
} else {
|
|
/*
|
|
* Image is not relocatable, so offset each segment based on
|
|
* the allocated physical chunk of memory.
|
|
*/
|
|
mem_reloc = mem_phys;
|
|
}
|
|
|
|
for (i = 0; i < ehdr->e_phnum; i++) {
|
|
phdr = &phdrs[i];
|
|
|
|
if (!mdt_phdr_valid(phdr))
|
|
continue;
|
|
|
|
offset = phdr->p_paddr - mem_reloc;
|
|
if (offset < 0 || offset + phdr->p_memsz > mem_size) {
|
|
dev_err(dev, "segment outside memory range\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
ptr = mem_region + offset;
|
|
|
|
if (phdr->p_filesz) {
|
|
sprintf(fw_name + fw_name_len - 3, "b%02d", i);
|
|
ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
|
|
ptr, phdr->p_filesz);
|
|
if (ret) {
|
|
dev_err(dev, "failed to load %s\n", fw_name);
|
|
break;
|
|
}
|
|
|
|
release_firmware(seg_fw);
|
|
}
|
|
|
|
if (phdr->p_memsz > phdr->p_filesz)
|
|
memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
|
|
}
|
|
|
|
if (reloc_base)
|
|
*reloc_base = mem_reloc;
|
|
|
|
out:
|
|
kfree(fw_name);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(qcom_mdt_load);
|
|
|
|
MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
|
|
MODULE_LICENSE("GPL v2");
|