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