diff options
Diffstat (limited to 'drivers/remoteproc/qcom_mdt_loader.c')
| -rw-r--r-- | drivers/remoteproc/qcom_mdt_loader.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/remoteproc/qcom_mdt_loader.c b/drivers/remoteproc/qcom_mdt_loader.c new file mode 100644 index 000000000000..114e8e4cef67 --- /dev/null +++ b/drivers/remoteproc/qcom_mdt_loader.c @@ -0,0 +1,179 @@ +/* + * 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"); |