drivers/irqchip/irq-gic-pm.c

Source file repositories/reference/linux-study-clean/drivers/irqchip/irq-gic-pm.c

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-gic-pm.c
Extension
.c
Size
3547 bytes
Lines
161
Domain
Driver Families
Bucket
drivers/irqchip
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 gic_clk_data {
	unsigned int num_clocks;
	const char *const *clocks;
};

struct gic_chip_pm {
	struct gic_chip_data *chip_data;
	const struct gic_clk_data *clk_data;
	struct clk_bulk_data *clks;
};

static int gic_runtime_resume(struct device *dev)
{
	struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
	struct gic_chip_data *gic = chip_pm->chip_data;
	const struct gic_clk_data *data = chip_pm->clk_data;
	int ret;

	ret = clk_bulk_prepare_enable(data->num_clocks, chip_pm->clks);
	if (ret)
		return ret;

	/*
	 * On the very first resume, the pointer to chip_pm->chip_data
	 * will be NULL and this is intentional, because we do not
	 * want to restore the GIC on the very first resume. So if
	 * the pointer is not valid just return.
	 */
	if (!gic)
		return 0;

	gic_dist_restore(gic);
	gic_cpu_restore(gic);

	return 0;
}

static int gic_runtime_suspend(struct device *dev)
{
	struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
	struct gic_chip_data *gic = chip_pm->chip_data;
	const struct gic_clk_data *data = chip_pm->clk_data;

	gic_dist_save(gic);
	gic_cpu_save(gic);

	clk_bulk_disable_unprepare(data->num_clocks, chip_pm->clks);

	return 0;
}

static int gic_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct gic_clk_data *data;
	struct gic_chip_pm *chip_pm;
	int ret, irq, i;

	data = of_device_get_match_data(&pdev->dev);
	if (!data) {
		dev_err(&pdev->dev, "no device match found\n");
		return -ENODEV;
	}

	chip_pm = devm_kzalloc(dev, sizeof(*chip_pm), GFP_KERNEL);
	if (!chip_pm)
		return -ENOMEM;

	irq = irq_of_parse_and_map(dev->of_node, 0);
	if (!irq) {
		dev_err(dev, "no parent interrupt found!\n");
		return -EINVAL;
	}

	chip_pm->clks = devm_kcalloc(dev, data->num_clocks,
				     sizeof(*chip_pm->clks), GFP_KERNEL);
	if (!chip_pm->clks)
		return -ENOMEM;

	for (i = 0; i < data->num_clocks; i++)
		chip_pm->clks[i].id = data->clocks[i];

	ret = devm_clk_bulk_get(dev, data->num_clocks, chip_pm->clks);
	if (ret)
		goto irq_dispose;

	chip_pm->clk_data = data;
	dev_set_drvdata(dev, chip_pm);

	pm_runtime_enable(dev);

Annotation

Implementation Notes