246 lines
6.4 KiB
C
246 lines
6.4 KiB
C
/*
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* Qualcomm Peripheral Image Loader
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*
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* Copyright (C) 2016 Linaro Ltd
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* Copyright (C) 2015 Sony Mobile Communications Inc
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/elf.h>
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#include <linux/firmware.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/qcom_scm.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/soc/qcom/mdt_loader.h>
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static bool mdt_phdr_valid(const struct elf32_phdr *phdr)
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{
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if (phdr->p_type != PT_LOAD)
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return false;
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if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
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return false;
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if (!phdr->p_memsz)
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return false;
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return true;
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}
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/**
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* qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
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* @fw: firmware object for the mdt file
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*
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* Returns size of the loaded firmware blob, or -EINVAL on failure.
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*/
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ssize_t qcom_mdt_get_size(const struct firmware *fw)
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{
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const struct elf32_phdr *phdrs;
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const struct elf32_phdr *phdr;
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const struct elf32_hdr *ehdr;
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phys_addr_t min_addr = PHYS_ADDR_MAX;
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phys_addr_t max_addr = 0;
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int i;
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ehdr = (struct elf32_hdr *)fw->data;
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phdrs = (struct elf32_phdr *)(ehdr + 1);
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for (i = 0; i < ehdr->e_phnum; i++) {
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phdr = &phdrs[i];
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if (!mdt_phdr_valid(phdr))
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continue;
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if (phdr->p_paddr < min_addr)
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min_addr = phdr->p_paddr;
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if (phdr->p_paddr + phdr->p_memsz > max_addr)
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max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
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}
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return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
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}
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EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
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static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
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const char *firmware, int pas_id, void *mem_region,
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phys_addr_t mem_phys, size_t mem_size,
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phys_addr_t *reloc_base, bool pas_init)
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{
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const struct elf32_phdr *phdrs;
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const struct elf32_phdr *phdr;
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const struct elf32_hdr *ehdr;
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const struct firmware *seg_fw;
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phys_addr_t mem_reloc;
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phys_addr_t min_addr = PHYS_ADDR_MAX;
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phys_addr_t max_addr = 0;
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size_t fw_name_len;
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ssize_t offset;
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char *fw_name;
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bool relocate = false;
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void *ptr;
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int ret;
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int i;
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if (!fw || !mem_region || !mem_phys || !mem_size)
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return -EINVAL;
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ehdr = (struct elf32_hdr *)fw->data;
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phdrs = (struct elf32_phdr *)(ehdr + 1);
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fw_name_len = strlen(firmware);
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if (fw_name_len <= 4)
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return -EINVAL;
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fw_name = kstrdup(firmware, GFP_KERNEL);
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if (!fw_name)
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return -ENOMEM;
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if (pas_init) {
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ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
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if (ret) {
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dev_err(dev, "invalid firmware metadata\n");
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goto out;
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}
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}
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for (i = 0; i < ehdr->e_phnum; i++) {
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phdr = &phdrs[i];
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if (!mdt_phdr_valid(phdr))
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continue;
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if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
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relocate = true;
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if (phdr->p_paddr < min_addr)
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min_addr = phdr->p_paddr;
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if (phdr->p_paddr + phdr->p_memsz > max_addr)
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max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
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}
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if (relocate) {
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if (pas_init) {
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ret = qcom_scm_pas_mem_setup(pas_id, mem_phys,
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max_addr - min_addr);
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if (ret) {
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dev_err(dev, "unable to setup relocation\n");
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goto out;
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}
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}
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/*
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* The image is relocatable, so offset each segment based on
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* the lowest segment address.
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*/
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mem_reloc = min_addr;
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} else {
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/*
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* Image is not relocatable, so offset each segment based on
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* the allocated physical chunk of memory.
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*/
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mem_reloc = mem_phys;
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}
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for (i = 0; i < ehdr->e_phnum; i++) {
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phdr = &phdrs[i];
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if (!mdt_phdr_valid(phdr))
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continue;
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offset = phdr->p_paddr - mem_reloc;
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if (offset < 0 || offset + phdr->p_memsz > mem_size) {
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dev_err(dev, "segment outside memory range\n");
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ret = -EINVAL;
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break;
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}
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ptr = mem_region + offset;
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if (phdr->p_filesz) {
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sprintf(fw_name + fw_name_len - 3, "b%02d", i);
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ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
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ptr, phdr->p_filesz);
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if (ret) {
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dev_err(dev, "failed to load %s\n", fw_name);
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break;
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}
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release_firmware(seg_fw);
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}
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if (phdr->p_memsz > phdr->p_filesz)
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memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
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}
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if (reloc_base)
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*reloc_base = mem_reloc;
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out:
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kfree(fw_name);
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return ret;
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}
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/**
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* qcom_mdt_load() - load the firmware which header is loaded as fw
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* @dev: device handle to associate resources with
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* @fw: firmware object for the mdt file
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* @firmware: name of the firmware, for construction of segment file names
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* @pas_id: PAS identifier
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* @mem_region: allocated memory region to load firmware into
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* @mem_phys: physical address of allocated memory region
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* @mem_size: size of the allocated memory region
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* @reloc_base: adjusted physical address after relocation
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*
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* Returns 0 on success, negative errno otherwise.
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*/
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int qcom_mdt_load(struct device *dev, const struct firmware *fw,
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const char *firmware, int pas_id, void *mem_region,
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phys_addr_t mem_phys, size_t mem_size,
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phys_addr_t *reloc_base)
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{
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return __qcom_mdt_load(dev, fw, firmware, pas_id, mem_region, mem_phys,
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mem_size, reloc_base, true);
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}
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EXPORT_SYMBOL_GPL(qcom_mdt_load);
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/**
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* qcom_mdt_load_no_init() - load the firmware which header is loaded as fw
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* @dev: device handle to associate resources with
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* @fw: firmware object for the mdt file
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* @firmware: name of the firmware, for construction of segment file names
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* @pas_id: PAS identifier
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* @mem_region: allocated memory region to load firmware into
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* @mem_phys: physical address of allocated memory region
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* @mem_size: size of the allocated memory region
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* @reloc_base: adjusted physical address after relocation
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*
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* Returns 0 on success, negative errno otherwise.
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*/
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int qcom_mdt_load_no_init(struct device *dev, const struct firmware *fw,
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const char *firmware, int pas_id,
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void *mem_region, phys_addr_t mem_phys,
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size_t mem_size, phys_addr_t *reloc_base)
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{
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return __qcom_mdt_load(dev, fw, firmware, pas_id, mem_region, mem_phys,
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mem_size, reloc_base, false);
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}
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EXPORT_SYMBOL_GPL(qcom_mdt_load_no_init);
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MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
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MODULE_LICENSE("GPL v2");
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