drivers/reset/reset-intel-gw.c

Source file repositories/reference/linux-study-clean/drivers/reset/reset-intel-gw.c

File Facts

System
Linux kernel
Corpus path
drivers/reset/reset-intel-gw.c
Extension
.c
Size
6376 bytes
Lines
257
Domain
Driver Families
Bucket
drivers/reset
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 intel_reset_soc {
	bool legacy;
	u32 reset_cell_count;
};

struct intel_reset_data {
	struct reset_controller_dev rcdev;
	const struct intel_reset_soc *soc_data;
	struct regmap *regmap;
	struct device *dev;
	u32 reboot_id;
};

static const struct regmap_config intel_rcu_regmap_config = {
	.name =		"intel-reset",
	.reg_bits =	32,
	.reg_stride =	4,
	.val_bits =	32,
};

/*
 * Reset status register offset relative to
 * the reset control register(X) is X + 4
 */
static u32 id_to_reg_and_bit_offsets(struct intel_reset_data *data,
				     unsigned long id, u32 *rst_req,
				     u32 *req_bit, u32 *stat_bit)
{
	*rst_req = FIELD_GET(REG_OFFSET_MASK, id);
	*req_bit = FIELD_GET(BIT_OFFSET_MASK, id);

	if (data->soc_data->legacy)
		*stat_bit = FIELD_GET(STAT_BIT_OFFSET_MASK, id);
	else
		*stat_bit = *req_bit;

	if (data->soc_data->legacy && *rst_req == RCU_RST_REQ)
		return RCU_RST_STAT;
	else
		return *rst_req + 0x4;
}

static int intel_set_clr_bits(struct intel_reset_data *data, unsigned long id,
			      bool set)
{
	u32 rst_req, req_bit, rst_stat, stat_bit, val;
	int ret;

	rst_stat = id_to_reg_and_bit_offsets(data, id, &rst_req,
					     &req_bit, &stat_bit);

	val = set ? BIT(req_bit) : 0;
	ret = regmap_update_bits(data->regmap, rst_req,  BIT(req_bit), val);
	if (ret)
		return ret;

	return regmap_read_poll_timeout(data->regmap, rst_stat, val,
					set == !!(val & BIT(stat_bit)), 20,
					200);
}

static int intel_assert_device(struct reset_controller_dev *rcdev,
			       unsigned long id)
{
	struct intel_reset_data *data = to_reset_data(rcdev);
	int ret;

	ret = intel_set_clr_bits(data, id, true);
	if (ret)
		dev_err(data->dev, "Reset assert failed %d\n", ret);

	return ret;
}

static int intel_deassert_device(struct reset_controller_dev *rcdev,
				 unsigned long id)
{
	struct intel_reset_data *data = to_reset_data(rcdev);
	int ret;

	ret = intel_set_clr_bits(data, id, false);
	if (ret)
		dev_err(data->dev, "Reset deassert failed %d\n", ret);

	return ret;
}

static int intel_reset_status(struct reset_controller_dev *rcdev,
			      unsigned long id)
{

Annotation

Implementation Notes