drivers/irqchip/irq-sp7021-intc.c

Source file repositories/reference/linux-study-clean/drivers/irqchip/irq-sp7021-intc.c

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-sp7021-intc.c
Extension
.c
Size
7099 bytes
Lines
279
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

if (unlikely(IS_GPIO_INT(hwirq) && TEST_STATE(hwirq, _IS_ACTIVE))) { // WORKAROUND
			ASSIGN_STATE(hwirq, _IS_ACTIVE, false);
			sp_intc_assign_bit(hwirq, REG_INTR_POLARITY, TEST_STATE(hwirq, _IS_LOW));
		} else {
			generic_handle_domain_irq(sp_intc.domain, hwirq);
		}
	}

	chained_irq_exit(chip, desc);
}

static struct irq_chip sp_intc_chip = {
	.name = "sp_intc",
	.irq_ack = sp_intc_ack_irq,
	.irq_mask = sp_intc_mask_irq,
	.irq_unmask = sp_intc_unmask_irq,
	.irq_set_type = sp_intc_set_type,
};

static int sp_intc_irq_domain_map(struct irq_domain *domain,
				  unsigned int irq, irq_hw_number_t hwirq)
{
	irq_set_chip_and_handler(irq, &sp_intc_chip, handle_level_irq);
	irq_set_chip_data(irq, &sp_intc_chip);
	irq_set_noprobe(irq);

	return 0;
}

static const struct irq_domain_ops sp_intc_dm_ops = {
	.xlate = irq_domain_xlate_twocell,
	.map = sp_intc_irq_domain_map,
};

static int sp_intc_irq_map(struct device_node *node, int i)
{
	unsigned int irq;

	irq = irq_of_parse_and_map(node, i);
	if (!irq)
		return -ENOENT;

	irq_set_chained_handler_and_data(irq, sp_intc_handle_ext_cascaded, (void *)(uintptr_t)i);

	return 0;
}

static int __init sp_intc_init_dt(struct device_node *node, struct device_node *parent)
{
	int i, ret;

	sp_intc.g0 = of_iomap(node, 0);
	if (!sp_intc.g0)
		return -ENXIO;

	sp_intc.g1 = of_iomap(node, 1);
	if (!sp_intc.g1) {
		ret = -ENXIO;
		goto out_unmap0;
	}

	ret = sp_intc_irq_map(node, 0); // EXT_INT0
	if (ret)
		goto out_unmap1;

	ret = sp_intc_irq_map(node, 1); // EXT_INT1
	if (ret)
		goto out_unmap1;

	/* initial regs */
	for (i = 0; i < SP_INTC_NR_GROUPS; i++) {
		/* all mask */
		writel_relaxed(0, REG_INTR_MASK + i * 4);
		/* all edge */
		writel_relaxed(~0, REG_INTR_TYPE + i * 4);
		/* all high-active */
		writel_relaxed(0, REG_INTR_POLARITY + i * 4);
		/* all EXT_INT0 */
		writel_relaxed(~0, REG_INTR_PRIORITY + i * 4);
		/* all clear */
		writel_relaxed(~0, REG_INTR_CLEAR + i * 4);
	}

	sp_intc.domain = irq_domain_create_linear(of_fwnode_handle(node), SP_INTC_NR_IRQS,
						  &sp_intc_dm_ops, &sp_intc);
	if (!sp_intc.domain) {
		ret = -ENOMEM;
		goto out_unmap1;
	}

Annotation

Implementation Notes