drivers/irqchip/irq-ftintc010.c

Source file repositories/reference/linux-study-clean/drivers/irqchip/irq-ftintc010.c

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-ftintc010.c
Extension
.c
Size
5531 bytes
Lines
196
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 ft010_irq_data {
	void __iomem *base;
	struct irq_chip chip;
	struct irq_domain *domain;
};

static void ft010_irq_mask(struct irq_data *d)
{
	struct ft010_irq_data *f = irq_data_get_irq_chip_data(d);
	unsigned int mask;

	mask = readl(FT010_IRQ_MASK(f->base));
	mask &= ~BIT(irqd_to_hwirq(d));
	writel(mask, FT010_IRQ_MASK(f->base));
}

static void ft010_irq_unmask(struct irq_data *d)
{
	struct ft010_irq_data *f = irq_data_get_irq_chip_data(d);
	unsigned int mask;

	mask = readl(FT010_IRQ_MASK(f->base));
	mask |= BIT(irqd_to_hwirq(d));
	writel(mask, FT010_IRQ_MASK(f->base));
}

static void ft010_irq_ack(struct irq_data *d)
{
	struct ft010_irq_data *f = irq_data_get_irq_chip_data(d);

	writel(BIT(irqd_to_hwirq(d)), FT010_IRQ_CLEAR(f->base));
}

static int ft010_irq_set_type(struct irq_data *d, unsigned int trigger)
{
	struct ft010_irq_data *f = irq_data_get_irq_chip_data(d);
	int offset = irqd_to_hwirq(d);
	u32 mode, polarity;

	mode = readl(FT010_IRQ_MODE(f->base));
	polarity = readl(FT010_IRQ_POLARITY(f->base));

	if (trigger & (IRQ_TYPE_LEVEL_LOW)) {
		irq_set_handler_locked(d, handle_level_irq);
		mode &= ~BIT(offset);
		polarity |= BIT(offset);
	} else if (trigger & (IRQ_TYPE_LEVEL_HIGH)) {
		irq_set_handler_locked(d, handle_level_irq);
		mode &= ~BIT(offset);
		polarity &= ~BIT(offset);
	} else if (trigger & IRQ_TYPE_EDGE_FALLING) {
		irq_set_handler_locked(d, handle_edge_irq);
		mode |= BIT(offset);
		polarity |= BIT(offset);
	} else if (trigger & IRQ_TYPE_EDGE_RISING) {
		irq_set_handler_locked(d, handle_edge_irq);
		mode |= BIT(offset);
		polarity &= ~BIT(offset);
	} else {
		irq_set_handler_locked(d, handle_bad_irq);
		pr_warn("Faraday IRQ: no supported trigger selected for line %d\n",
			offset);
	}

	writel(mode, FT010_IRQ_MODE(f->base));
	writel(polarity, FT010_IRQ_POLARITY(f->base));

	return 0;
}

static struct irq_chip ft010_irq_chip = {
	.name		= "FTINTC010",
	.irq_ack	= ft010_irq_ack,
	.irq_mask	= ft010_irq_mask,
	.irq_unmask	= ft010_irq_unmask,
	.irq_set_type	= ft010_irq_set_type,
};

/* Local static for the IRQ entry call */
static struct ft010_irq_data firq;

static void __exception_irq_entry ft010_irqchip_handle_irq(struct pt_regs *regs)
{
	struct ft010_irq_data *f = &firq;
	int irq;
	u32 status;

	while ((status = readl(FT010_IRQ_STATUS(f->base)))) {
		irq = ffs(status) - 1;
		generic_handle_domain_irq(f->domain, irq);

Annotation

Implementation Notes