drivers/irqchip/irq-mvebu-odmi.c

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

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-mvebu-odmi.c
Extension
.c
Size
5788 bytes
Lines
230
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 odmi_data {
	struct resource res;
	void __iomem *base;
	unsigned int spi_base;
};

static struct odmi_data *odmis;
static unsigned long *odmis_bm;
static unsigned int odmis_count;

/* Protects odmis_bm */
static DEFINE_SPINLOCK(odmis_bm_lock);

static void odmi_compose_msi_msg(struct irq_data *d, struct msi_msg *msg)
{
	struct odmi_data *odmi;
	phys_addr_t addr;
	unsigned int odmin;

	if (WARN_ON(d->hwirq >= odmis_count * NODMIS_PER_FRAME))
		return;

	odmi = &odmis[d->hwirq >> NODMIS_SHIFT];
	odmin = d->hwirq & NODMIS_MASK;

	addr = odmi->res.start + GICP_ODMIN_SET;

	msg->address_hi = upper_32_bits(addr);
	msg->address_lo = lower_32_bits(addr);
	msg->data = odmin << GICP_ODMI_INT_NUM_SHIFT;
}

static struct irq_chip odmi_irq_chip = {
	.name			= "ODMI",
	.irq_mask		= irq_chip_mask_parent,
	.irq_unmask		= irq_chip_unmask_parent,
	.irq_eoi		= irq_chip_eoi_parent,
	.irq_set_affinity	= irq_chip_set_affinity_parent,
	.irq_compose_msi_msg	= odmi_compose_msi_msg,
};

static int odmi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
				 unsigned int nr_irqs, void *args)
{
	struct odmi_data *odmi = NULL;
	struct irq_fwspec fwspec;
	struct irq_data *d;
	unsigned int hwirq, odmin;
	int ret;

	spin_lock(&odmis_bm_lock);
	hwirq = find_first_zero_bit(odmis_bm, NODMIS_PER_FRAME * odmis_count);
	if (hwirq >= NODMIS_PER_FRAME * odmis_count) {
		spin_unlock(&odmis_bm_lock);
		return -ENOSPC;
	}

	__set_bit(hwirq, odmis_bm);
	spin_unlock(&odmis_bm_lock);

	odmi = &odmis[hwirq >> NODMIS_SHIFT];
	odmin = hwirq & NODMIS_MASK;

	fwspec.fwnode = domain->parent->fwnode;
	fwspec.param_count = 3;
	fwspec.param[0] = GIC_SPI;
	fwspec.param[1] = odmi->spi_base - 32 + odmin;
	fwspec.param[2] = IRQ_TYPE_EDGE_RISING;

	ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
	if (ret) {
		pr_err("Cannot allocate parent IRQ\n");
		spin_lock(&odmis_bm_lock);
		__clear_bit(odmin, odmis_bm);
		spin_unlock(&odmis_bm_lock);
		return ret;
	}

	/* Configure the interrupt line to be edge */
	d = irq_domain_get_irq_data(domain->parent, virq);
	d->chip->irq_set_type(d, IRQ_TYPE_EDGE_RISING);

	irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
				      &odmi_irq_chip, NULL);

	return 0;
}

static void odmi_irq_domain_free(struct irq_domain *domain,
				 unsigned int virq, unsigned int nr_irqs)

Annotation

Implementation Notes