drivers/remoteproc/qcom_pil_info.c

Source file repositories/reference/linux-study-clean/drivers/remoteproc/qcom_pil_info.c

File Facts

System
Linux kernel
Corpus path
drivers/remoteproc/qcom_pil_info.c
Extension
.c
Size
3097 bytes
Lines
130
Domain
Driver Families
Bucket
drivers/remoteproc
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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);

Annotation

Implementation Notes