drivers/irqchip/irq-loongson-htvec.c

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

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-loongson-htvec.c
Extension
.c
Size
7556 bytes
Lines
330
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 htvec {
	int			num_parents;
	void __iomem		*base;
	struct irq_domain	*htvec_domain;
	raw_spinlock_t		htvec_lock;
	u32			saved_vec_en[HTVEC_MAX_PARENT_IRQ];
};

static struct htvec *htvec_priv;

static void htvec_irq_dispatch(struct irq_desc *desc)
{
	int i;
	u32 pending;
	bool handled = false;
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct htvec *priv = irq_desc_get_handler_data(desc);

	chained_irq_enter(chip, desc);

	for (i = 0; i < priv->num_parents; i++) {
		pending = readl(priv->base + 4 * i);
		while (pending) {
			int bit = __ffs(pending);

			generic_handle_domain_irq(priv->htvec_domain,
						  bit + VEC_COUNT_PER_REG * i);
			pending &= ~BIT(bit);
			handled = true;
		}
	}

	if (!handled)
		spurious_interrupt();

	chained_irq_exit(chip, desc);
}

static void htvec_ack_irq(struct irq_data *d)
{
	struct htvec *priv = irq_data_get_irq_chip_data(d);

	writel(BIT(VEC_REG_BIT(d->hwirq)),
	       priv->base + VEC_REG_IDX(d->hwirq) * 4);
}

static void htvec_mask_irq(struct irq_data *d)
{
	u32 reg;
	void __iomem *addr;
	struct htvec *priv = irq_data_get_irq_chip_data(d);

	raw_spin_lock(&priv->htvec_lock);
	addr = priv->base + HTVEC_EN_OFF;
	addr += VEC_REG_IDX(d->hwirq) * 4;
	reg = readl(addr);
	reg &= ~BIT(VEC_REG_BIT(d->hwirq));
	writel(reg, addr);
	raw_spin_unlock(&priv->htvec_lock);
}

static void htvec_unmask_irq(struct irq_data *d)
{
	u32 reg;
	void __iomem *addr;
	struct htvec *priv = irq_data_get_irq_chip_data(d);

	raw_spin_lock(&priv->htvec_lock);
	addr = priv->base + HTVEC_EN_OFF;
	addr += VEC_REG_IDX(d->hwirq) * 4;
	reg = readl(addr);
	reg |= BIT(VEC_REG_BIT(d->hwirq));
	writel(reg, addr);
	raw_spin_unlock(&priv->htvec_lock);
}

static struct irq_chip htvec_irq_chip = {
	.name			= "LOONGSON_HTVEC",
	.irq_mask		= htvec_mask_irq,
	.irq_unmask		= htvec_unmask_irq,
	.irq_ack		= htvec_ack_irq,
};

static int htvec_domain_alloc(struct irq_domain *domain, unsigned int virq,
			      unsigned int nr_irqs, void *arg)
{
	int ret;
	unsigned long hwirq;
	unsigned int type, i;
	struct htvec *priv = domain->host_data;

Annotation

Implementation Notes