drivers/irqchip/irq-atmel-aic-common.c

Source file repositories/reference/linux-study-clean/drivers/irqchip/irq-atmel-aic-common.c

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-atmel-aic-common.c
Extension
.c
Size
5966 bytes
Lines
265
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 aic_chip_data {
	u32 ext_irqs;
};

static void aic_common_shutdown(struct irq_data *d)
{
	struct irq_chip_type *ct = irq_data_get_chip_type(d);

	ct->chip.irq_mask(d);
}

int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct aic_chip_data *aic = gc->private;
	unsigned aic_type;

	switch (type) {
	case IRQ_TYPE_LEVEL_HIGH:
		aic_type = AT91_AIC_SRCTYPE_HIGH;
		break;
	case IRQ_TYPE_EDGE_RISING:
		aic_type = AT91_AIC_SRCTYPE_RISING;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		if (!(d->mask & aic->ext_irqs))
			return -EINVAL;

		aic_type = AT91_AIC_SRCTYPE_LOW;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		if (!(d->mask & aic->ext_irqs))
			return -EINVAL;

		aic_type = AT91_AIC_SRCTYPE_FALLING;
		break;
	default:
		return -EINVAL;
	}

	*val &= ~AT91_AIC_SRCTYPE;
	*val |= aic_type;

	return 0;
}

void aic_common_set_priority(int priority, unsigned *val)
{
	*val &= ~AT91_AIC_PRIOR;
	*val |= priority;
}

int aic_common_irq_domain_xlate(struct irq_domain *d,
				struct device_node *ctrlr,
				const u32 *intspec,
				unsigned int intsize,
				irq_hw_number_t *out_hwirq,
				unsigned int *out_type)
{
	if (WARN_ON(intsize < 3))
		return -EINVAL;

	if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
		    (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
		return -EINVAL;

	*out_hwirq = intspec[0];
	*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;

	return 0;
}

static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
{
	struct device_node *node = irq_domain_get_of_node(domain);
	struct irq_chip_generic *gc;
	struct aic_chip_data *aic;
	u32 hwirq;

	gc = irq_get_domain_generic_chip(domain, 0);

	aic = gc->private;
	aic->ext_irqs |= 1;

	of_property_for_each_u32(node, "atmel,external-irqs", hwirq) {
		gc = irq_get_domain_generic_chip(domain, hwirq);
		if (!gc) {
			pr_warn("AIC: external irq %d >= %d skip it\n",
				hwirq, domain->revmap_size);
			continue;

Annotation

Implementation Notes