drivers/irqchip/irq-mvebu-pic.c

Source file repositories/reference/linux-study-clean/drivers/irqchip/irq-mvebu-pic.c

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-mvebu-pic.c
Extension
.c
Size
4988 bytes
Lines
198
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 mvebu_pic {
	void __iomem *base;
	u32 parent_irq;
	struct irq_domain *domain;
	struct platform_device *pdev;
};

static void mvebu_pic_reset(struct mvebu_pic *pic)
{
	/* ACK and mask all interrupts */
	writel(0, pic->base + PIC_MASK);
	writel(PIC_MAX_IRQ_MASK, pic->base + PIC_CAUSE);
}

static void mvebu_pic_eoi_irq(struct irq_data *d)
{
	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);

	writel(1 << d->hwirq, pic->base + PIC_CAUSE);
}

static void mvebu_pic_mask_irq(struct irq_data *d)
{
	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);
	u32 reg;

	reg =  readl(pic->base + PIC_MASK);
	reg |= (1 << d->hwirq);
	writel(reg, pic->base + PIC_MASK);
}

static void mvebu_pic_unmask_irq(struct irq_data *d)
{
	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);
	u32 reg;

	reg = readl(pic->base + PIC_MASK);
	reg &= ~(1 << d->hwirq);
	writel(reg, pic->base + PIC_MASK);
}

static void mvebu_pic_print_chip(struct irq_data *d, struct seq_file *p)
{
	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);

	seq_puts(p, dev_name(&pic->pdev->dev));
}

static const struct irq_chip mvebu_pic_chip = {
	.irq_mask	= mvebu_pic_mask_irq,
	.irq_unmask	= mvebu_pic_unmask_irq,
	.irq_eoi	= mvebu_pic_eoi_irq,
	.irq_print_chip	= mvebu_pic_print_chip,
};

static int mvebu_pic_irq_map(struct irq_domain *domain, unsigned int virq,
			     irq_hw_number_t hwirq)
{
	struct mvebu_pic *pic = domain->host_data;

	irq_set_percpu_devid(virq);
	irq_set_chip_data(virq, pic);
	irq_set_chip_and_handler(virq, &mvebu_pic_chip, handle_percpu_devid_irq);
	irq_set_status_flags(virq, IRQ_LEVEL);
	irq_set_probe(virq);

	return 0;
}

static const struct irq_domain_ops mvebu_pic_domain_ops = {
	.map = mvebu_pic_irq_map,
	.xlate = irq_domain_xlate_onecell,
};

static void mvebu_pic_handle_cascade_irq(struct irq_desc *desc)
{
	struct mvebu_pic *pic = irq_desc_get_handler_data(desc);
	struct irq_chip *chip = irq_desc_get_chip(desc);
	unsigned long irqmap, irqn;

	irqmap = readl_relaxed(pic->base + PIC_CAUSE);
	chained_irq_enter(chip, desc);

	for_each_set_bit(irqn, &irqmap, BITS_PER_LONG)
		generic_handle_domain_irq(pic->domain, irqn);

	chained_irq_exit(chip, desc);
}

static void mvebu_pic_enable_percpu_irq(void *data)

Annotation

Implementation Notes