drivers/irqchip/irq-renesas-intc-irqpin.c

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

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-renesas-intc-irqpin.c
Extension
.c
Size
16282 bytes
Lines
609
Domain
Driver Families
Bucket
drivers/irqchip
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 intc_irqpin_iomem {
	void __iomem *iomem;
	unsigned long (*read)(void __iomem *iomem);
	void (*write)(void __iomem *iomem, unsigned long data);
	int width;
};

struct intc_irqpin_irq {
	int hw_irq;
	int requested_irq;
	int domain_irq;
	struct intc_irqpin_priv *p;
};

struct intc_irqpin_priv {
	struct intc_irqpin_iomem iomem[INTC_IRQPIN_REG_NR];
	struct intc_irqpin_irq irq[INTC_IRQPIN_MAX];
	unsigned int sense_bitfield_width;
	struct platform_device *pdev;
	struct irq_chip irq_chip;
	struct irq_domain *irq_domain;
	atomic_t wakeup_path;
	unsigned shared_irqs:1;
	u8 shared_irq_mask;
};

struct intc_irqpin_config {
	int irlm_bit;		/* -1 if non-existent */
};

static unsigned long intc_irqpin_read32(void __iomem *iomem)
{
	return ioread32(iomem);
}

static unsigned long intc_irqpin_read8(void __iomem *iomem)
{
	return ioread8(iomem);
}

static void intc_irqpin_write32(void __iomem *iomem, unsigned long data)
{
	iowrite32(data, iomem);
}

static void intc_irqpin_write8(void __iomem *iomem, unsigned long data)
{
	iowrite8(data, iomem);
}

static inline unsigned long intc_irqpin_read(struct intc_irqpin_priv *p,
					     int reg)
{
	struct intc_irqpin_iomem *i = &p->iomem[reg];

	return i->read(i->iomem);
}

static inline void intc_irqpin_write(struct intc_irqpin_priv *p,
				     int reg, unsigned long data)
{
	struct intc_irqpin_iomem *i = &p->iomem[reg];

	i->write(i->iomem, data);
}

static inline unsigned long intc_irqpin_hwirq_mask(struct intc_irqpin_priv *p,
						   int reg, int hw_irq)
{
	return BIT((p->iomem[reg].width - 1) - hw_irq);
}

static inline void intc_irqpin_irq_write_hwirq(struct intc_irqpin_priv *p,
					       int reg, int hw_irq)
{
	intc_irqpin_write(p, reg, intc_irqpin_hwirq_mask(p, reg, hw_irq));
}

static DEFINE_RAW_SPINLOCK(intc_irqpin_lock); /* only used by slow path */

static void intc_irqpin_read_modify_write(struct intc_irqpin_priv *p,
					  int reg, int shift,
					  int width, int value)
{
	unsigned long flags;
	unsigned long tmp;

	raw_spin_lock_irqsave(&intc_irqpin_lock, flags);

	tmp = intc_irqpin_read(p, reg);

Annotation

Implementation Notes