drivers/net/dsa/mv88e6xxx/global2.c

Source file repositories/reference/linux-study-clean/drivers/net/dsa/mv88e6xxx/global2.c

File Facts

System
Linux kernel
Corpus path
drivers/net/dsa/mv88e6xxx/global2.c
Extension
.c
Size
28922 bytes
Lines
1218
Domain
Driver Families
Bucket
drivers/net
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

if (reg & (1 << n)) {
			sub_irq = irq_find_mapping(chip->g2_irq.domain, n);
			handle_nested_irq(sub_irq);
			++nhandled;
		}
	}
out:
	return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE);
}

static void mv88e6xxx_g2_irq_bus_lock(struct irq_data *d)
{
	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);

	mv88e6xxx_reg_lock(chip);
}

static void mv88e6xxx_g2_irq_bus_sync_unlock(struct irq_data *d)
{
	struct mv88e6xxx_chip *chip = irq_data_get_irq_chip_data(d);
	int err;

	err = mv88e6xxx_g2_int_mask(chip, ~chip->g2_irq.masked);
	if (err)
		dev_err(chip->dev, "failed to mask interrupts\n");

	mv88e6xxx_reg_unlock(chip);
}

static const struct irq_chip mv88e6xxx_g2_irq_chip = {
	.name			= "mv88e6xxx-g2",
	.irq_mask		= mv88e6xxx_g2_irq_mask,
	.irq_unmask		= mv88e6xxx_g2_irq_unmask,
	.irq_bus_lock		= mv88e6xxx_g2_irq_bus_lock,
	.irq_bus_sync_unlock	= mv88e6xxx_g2_irq_bus_sync_unlock,
};

static int mv88e6xxx_g2_irq_domain_map(struct irq_domain *d,
				       unsigned int irq,
				       irq_hw_number_t hwirq)
{
	struct mv88e6xxx_chip *chip = d->host_data;

	irq_set_chip_data(irq, d->host_data);
	irq_set_chip_and_handler(irq, &chip->g2_irq.chip, handle_level_irq);
	irq_set_noprobe(irq);

	return 0;
}

static const struct irq_domain_ops mv88e6xxx_g2_irq_domain_ops = {
	.map	= mv88e6xxx_g2_irq_domain_map,
	.xlate	= irq_domain_xlate_twocell,
};

void mv88e6xxx_g2_irq_free(struct mv88e6xxx_chip *chip)
{
	int irq, virq;

	mv88e6xxx_g2_watchdog_free(chip);

	free_irq(chip->device_irq, chip);
	irq_dispose_mapping(chip->device_irq);

	for (irq = 0; irq < 16; irq++) {
		virq = irq_find_mapping(chip->g2_irq.domain, irq);
		irq_dispose_mapping(virq);
	}

	irq_domain_remove(chip->g2_irq.domain);
}

int mv88e6xxx_g2_irq_setup(struct mv88e6xxx_chip *chip)
{
	int err, irq, virq;

	chip->g2_irq.masked = ~0;
	mv88e6xxx_reg_lock(chip);
	err = mv88e6xxx_g2_int_mask(chip, ~chip->g2_irq.masked);
	mv88e6xxx_reg_unlock(chip);
	if (err)
		return err;

	chip->g2_irq.domain = irq_domain_create_simple(dev_fwnode(chip->dev), 16, 0,
						       &mv88e6xxx_g2_irq_domain_ops, chip);
	if (!chip->g2_irq.domain)
		return -ENOMEM;

	for (irq = 0; irq < 16; irq++)
		irq_create_mapping(chip->g2_irq.domain, irq);

Annotation

Implementation Notes