drivers/irqchip/irq-vf610-mscm-ir.c

Source file repositories/reference/linux-study-clean/drivers/irqchip/irq-vf610-mscm-ir.c

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-vf610-mscm-ir.c
Extension
.c
Size
6396 bytes
Lines
235
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 vf610_mscm_ir_chip_data {
	void __iomem *mscm_ir_base;
	u16 cpu_mask;
	u16 saved_irsprc[MSCM_IRSPRC_NUM];
	bool is_nvic;
};

static struct vf610_mscm_ir_chip_data *mscm_ir_data;

static inline void vf610_mscm_ir_save(struct vf610_mscm_ir_chip_data *data)
{
	int i;

	for (i = 0; i < MSCM_IRSPRC_NUM; i++)
		data->saved_irsprc[i] = readw_relaxed(data->mscm_ir_base + MSCM_IRSPRC(i));
}

static inline void vf610_mscm_ir_restore(struct vf610_mscm_ir_chip_data *data)
{
	int i;

	for (i = 0; i < MSCM_IRSPRC_NUM; i++)
		writew_relaxed(data->saved_irsprc[i], data->mscm_ir_base + MSCM_IRSPRC(i));
}

static int vf610_mscm_ir_notifier(struct notifier_block *self,
				  unsigned long cmd, void *v)
{
	switch (cmd) {
	case CPU_CLUSTER_PM_ENTER:
		vf610_mscm_ir_save(mscm_ir_data);
		break;
	case CPU_CLUSTER_PM_ENTER_FAILED:
	case CPU_CLUSTER_PM_EXIT:
		vf610_mscm_ir_restore(mscm_ir_data);
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block mscm_ir_notifier_block = {
	.notifier_call = vf610_mscm_ir_notifier,
};

static void vf610_mscm_ir_enable(struct irq_data *data)
{
	irq_hw_number_t hwirq = data->hwirq;
	struct vf610_mscm_ir_chip_data *chip_data = data->chip_data;
	u16 irsprc;

	irsprc = readw_relaxed(chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));
	irsprc &= MSCM_IRSPRC_CPEN_MASK;

	WARN_ON(irsprc & ~chip_data->cpu_mask);

	writew_relaxed(chip_data->cpu_mask,
		       chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));

	irq_chip_enable_parent(data);
}

static void vf610_mscm_ir_disable(struct irq_data *data)
{
	irq_hw_number_t hwirq = data->hwirq;
	struct vf610_mscm_ir_chip_data *chip_data = data->chip_data;

	writew_relaxed(0x0, chip_data->mscm_ir_base + MSCM_IRSPRC(hwirq));

	irq_chip_disable_parent(data);
}

static struct irq_chip vf610_mscm_ir_irq_chip = {
	.name			= "mscm-ir",
	.irq_mask		= irq_chip_mask_parent,
	.irq_unmask		= irq_chip_unmask_parent,
	.irq_eoi		= irq_chip_eoi_parent,
	.irq_enable		= vf610_mscm_ir_enable,
	.irq_disable		= vf610_mscm_ir_disable,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_set_affinity	= irq_chip_set_affinity_parent,
};

static int vf610_mscm_ir_domain_alloc(struct irq_domain *domain, unsigned int virq,
				      unsigned int nr_irqs, void *arg)
{
	int i;
	irq_hw_number_t hwirq;
	struct irq_fwspec *fwspec = arg;
	struct irq_fwspec parent_fwspec;

Annotation

Implementation Notes