drivers/irqchip/irq-mbigen.c

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

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-mbigen.c
Extension
.c
Size
9172 bytes
Lines
373
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 mbigen_device {
	struct platform_device	*pdev;
	void __iomem		*base;
};

static inline unsigned int get_mbigen_node_offset(unsigned int nid)
{
	unsigned int offset = nid * MBIGEN_NODE_OFFSET;

	/*
	 * To avoid touched clear register in unexpected way, we need to directly
	 * skip clear register when access to more than 10 mbigen nodes.
	 */
	if (nid >= (REG_MBIGEN_CLEAR_OFFSET / MBIGEN_NODE_OFFSET))
		offset += MBIGEN_NODE_OFFSET;

	return offset;
}

static inline unsigned int get_mbigen_vec_reg(irq_hw_number_t hwirq)
{
	unsigned int nid, pin;

	hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
	nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
	pin = hwirq % IRQS_PER_MBIGEN_NODE;

	return pin * 4 + get_mbigen_node_offset(nid) + REG_MBIGEN_VEC_OFFSET;
}

static inline void get_mbigen_type_reg(irq_hw_number_t hwirq,
					u32 *mask, u32 *addr)
{
	unsigned int nid, irq_ofst, ofst;

	hwirq -= RESERVED_IRQ_PER_MBIGEN_CHIP;
	nid = hwirq / IRQS_PER_MBIGEN_NODE + 1;
	irq_ofst = hwirq % IRQS_PER_MBIGEN_NODE;

	*mask = 1 << (irq_ofst % 32);
	ofst = irq_ofst / 32 * 4;

	*addr = ofst + get_mbigen_node_offset(nid) + REG_MBIGEN_TYPE_OFFSET;
}

static inline void get_mbigen_clear_reg(irq_hw_number_t hwirq,
					u32 *mask, u32 *addr)
{
	unsigned int ofst = (hwirq / 32) * 4;

	*mask = 1 << (hwirq % 32);
	*addr = ofst + REG_MBIGEN_CLEAR_OFFSET;
}

static void mbigen_eoi_irq(struct irq_data *data)
{
	void __iomem *base = data->chip_data;
	u32 mask, addr;

	get_mbigen_clear_reg(data->hwirq, &mask, &addr);

	writel_relaxed(mask, base + addr);

	irq_chip_eoi_parent(data);
}

static int mbigen_set_type(struct irq_data *data, unsigned int type)
{
	void __iomem *base = data->chip_data;
	u32 mask, addr, val;

	if (type != IRQ_TYPE_LEVEL_HIGH && type != IRQ_TYPE_EDGE_RISING)
		return -EINVAL;

	get_mbigen_type_reg(data->hwirq, &mask, &addr);

	val = readl_relaxed(base + addr);

	if (type == IRQ_TYPE_LEVEL_HIGH)
		val |= mask;
	else
		val &= ~mask;

	writel_relaxed(val, base + addr);

	return 0;
}

static void mbigen_write_msi_msg(struct irq_data *d, struct msi_msg *msg)
{

Annotation

Implementation Notes