drivers/soc/samsung/exynos-chipid.c

Source file repositories/reference/linux-study-clean/drivers/soc/samsung/exynos-chipid.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/samsung/exynos-chipid.c
Extension
.c
Size
7603 bytes
Lines
270
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: implementation source
Status
source 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 exynos_chipid_variant {
	unsigned int main_rev_reg;	/* main revision register offset */
	unsigned int sub_rev_reg;	/* sub revision register offset */
	unsigned int main_rev_shift;	/* main revision offset in rev_reg */
	unsigned int sub_rev_shift;	/* sub revision offset in rev_reg */
	bool efuse;
};

struct exynos_chipid_info {
	u32 product_id;
	u32 revision;
};

static const struct exynos_soc_id {
	const char *name;
	unsigned int id;
} soc_ids[] = {
	/* List ordered by SoC name */
	/* Compatible with: samsung,exynos4210-chipid */
	{ "EXYNOS3250", 0xE3472000 },
	{ "EXYNOS4210", 0x43200000 },	/* EVT0 revision */
	{ "EXYNOS4210", 0x43210000 },
	{ "EXYNOS4212", 0x43220000 },
	{ "EXYNOS4412", 0xE4412000 },
	{ "EXYNOS5250", 0x43520000 },
	{ "EXYNOS5260", 0xE5260000 },
	{ "EXYNOS5410", 0xE5410000 },
	{ "EXYNOS5420", 0xE5420000 },
	{ "EXYNOS5433", 0xE5433000 },
	{ "EXYNOS5440", 0xE5440000 },
	{ "EXYNOS5800", 0xE5422000 },
	{ "EXYNOS7420", 0xE7420000 },
	{ "EXYNOS7870", 0xE7870000 },
	{ "EXYNOS8890", 0xE8890000 },
	/* Compatible with: samsung,exynos850-chipid */
	{ "EXYNOS2200", 0xE9925000 },
	{ "EXYNOS7885", 0xE7885000 },
	{ "EXYNOS850", 0xE3830000 },
	{ "EXYNOS8895", 0xE8895000 },
	{ "EXYNOS9610", 0xE9610000 },
	{ "EXYNOS9810", 0xE9810000 },
	{ "EXYNOS990", 0xE9830000 },
	{ "EXYNOSAUTOV9", 0xAAA80000 },
	{ "EXYNOSAUTOV920", 0x0A920000 },
	/* Compatible with: google,gs101-otp */
	{ "GS101", 0x9845000 },
};

static const char *exynos_product_id_to_name(unsigned int product_id)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(soc_ids); i++)
		if (product_id == soc_ids[i].id)
			return soc_ids[i].name;
	return NULL;
}

static int exynos_chipid_get_chipid_info(struct device *dev,
		struct regmap *regmap, const struct exynos_chipid_variant *data,
		struct exynos_chipid_info *soc_info)
{
	int ret;
	unsigned int val, main_rev, sub_rev;

	ret = regmap_read(regmap, EXYNOS_CHIPID_REG_PRO_ID, &val);
	if (ret < 0)
		return dev_err_probe(dev, ret, "failed to read Product ID\n");
	soc_info->product_id = val & EXYNOS_MASK;

	if (data->sub_rev_reg == EXYNOS_CHIPID_REG_PRO_ID) {
		/* exynos4210 case */
		main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
		sub_rev = (val >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;
	} else {
		unsigned int val2;

		ret = regmap_read(regmap, data->sub_rev_reg, &val2);
		if (ret < 0)
			return dev_err_probe(dev, ret,
					     "failed to read revision\n");

		if (data->main_rev_reg == EXYNOS_CHIPID_REG_PRO_ID)
			/* gs101 case */
			main_rev = (val >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;
		else
			/* exynos850 case */
			main_rev = (val2 >> data->main_rev_shift) & EXYNOS_REV_PART_MASK;

		sub_rev = (val2 >> data->sub_rev_shift) & EXYNOS_REV_PART_MASK;

Annotation

Implementation Notes