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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2019-2020 Linaro Ltd.
- */
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/mutex.h>
- #include <linux/of_address.h>
- #include "qcom_pil_info.h"
- /*
- * The PIL relocation information region is used to communicate memory regions
- * occupied by co-processor firmware for post mortem crash analysis.
- *
- * It consists of an array of entries with an 8 byte textual identifier of the
- * region followed by a 64 bit base address and 32 bit size, both little
- * endian.
- */
- #define PIL_RELOC_NAME_LEN 8
- #define PIL_RELOC_ENTRY_SIZE (PIL_RELOC_NAME_LEN + sizeof(__le64) + sizeof(__le32))
- struct pil_reloc {
- void __iomem *base;
- size_t num_entries;
- };
- static struct pil_reloc _reloc __read_mostly;
- static DEFINE_MUTEX(pil_reloc_lock);
- static int qcom_pil_info_init(void)
- {
- struct device_node *np;
- struct resource imem;
- void __iomem *base;
- int ret;
- /* Already initialized? */
- if (_reloc.base)
- return 0;
- np = of_find_compatible_node(NULL, NULL, "qcom,pil-reloc-info");
- if (!np)
- return -ENOENT;
- ret = of_address_to_resource(np, 0, &imem);
- of_node_put(np);
- if (ret < 0)
- return ret;
- base = ioremap(imem.start, resource_size(&imem));
- if (!base) {
- pr_err("failed to map PIL relocation info region\n");
- return -ENOMEM;
- }
- memset_io(base, 0, resource_size(&imem));
- _reloc.base = base;
- _reloc.num_entries = (u32)resource_size(&imem) / PIL_RELOC_ENTRY_SIZE;
- return 0;
- }
- /**
- * qcom_pil_info_store() - store PIL information of image in IMEM
- * @image: name of the image
- * @base: base address of the loaded image
- * @size: size of the loaded image
- *
- * Return: 0 on success, negative errno on failure
- */
- int qcom_pil_info_store(const char *image, phys_addr_t base, size_t size)
- {
- char buf[PIL_RELOC_NAME_LEN];
- void __iomem *entry;
- int ret;
- int i;
- mutex_lock(&pil_reloc_lock);
- ret = qcom_pil_info_init();
- if (ret < 0) {
- mutex_unlock(&pil_reloc_lock);
- return ret;
- }
- for (i = 0; i < _reloc.num_entries; i++) {
- entry = _reloc.base + i * PIL_RELOC_ENTRY_SIZE;
- memcpy_fromio(buf, entry, PIL_RELOC_NAME_LEN);
- /*
- * An empty record means we didn't find it, given that the
- * records are packed.
- */
- if (!buf[0])
- goto found_unused;
- if (!strncmp(buf, image, PIL_RELOC_NAME_LEN))
- goto found_existing;
- }
- pr_warn("insufficient PIL info slots\n");
- mutex_unlock(&pil_reloc_lock);
- return -ENOMEM;
- found_unused:
- memcpy_toio(entry, image, strnlen(image, PIL_RELOC_NAME_LEN));
- found_existing:
- /* Use two writel() as base is only aligned to 4 bytes on odd entries */
- writel(base, entry + PIL_RELOC_NAME_LEN);
- writel((u64)base >> 32, entry + PIL_RELOC_NAME_LEN + 4);
- writel(size, entry + PIL_RELOC_NAME_LEN + sizeof(__le64));
- mutex_unlock(&pil_reloc_lock);
- return 0;
- }
- EXPORT_SYMBOL_GPL(qcom_pil_info_store);
- static void __exit pil_reloc_exit(void)
- {
- mutex_lock(&pil_reloc_lock);
- iounmap(_reloc.base);
- _reloc.base = NULL;
- mutex_unlock(&pil_reloc_lock);
- }
- module_exit(pil_reloc_exit);
- MODULE_DESCRIPTION("Qualcomm PIL relocation info");
- MODULE_LICENSE("GPL v2");
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