drivers/irqchip/irq-keystone.c

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

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-keystone.c
Extension
.c
Size
5495 bytes
Lines
221
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 keystone_irq_device {
	struct device		*dev;
	struct irq_chip		 chip;
	u32			 mask;
	int			 irq;
	struct irq_domain	*irqd;
	struct regmap		*devctrl_regs;
	u32			devctrl_offset;
	raw_spinlock_t		wa_lock;
};

static inline u32 keystone_irq_readl(struct keystone_irq_device *kirq)
{
	int ret;
	u32 val = 0;

	ret = regmap_read(kirq->devctrl_regs, kirq->devctrl_offset, &val);
	if (ret < 0)
		dev_dbg(kirq->dev, "irq read failed ret(%d)\n", ret);
	return val;
}

static inline void
keystone_irq_writel(struct keystone_irq_device *kirq, u32 value)
{
	int ret;

	ret = regmap_write(kirq->devctrl_regs, kirq->devctrl_offset, value);
	if (ret < 0)
		dev_dbg(kirq->dev, "irq write failed ret(%d)\n", ret);
}

static void keystone_irq_setmask(struct irq_data *d)
{
	struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d);

	kirq->mask |= BIT(d->hwirq);
	dev_dbg(kirq->dev, "mask %lu [%x]\n", d->hwirq, kirq->mask);
}

static void keystone_irq_unmask(struct irq_data *d)
{
	struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d);

	kirq->mask &= ~BIT(d->hwirq);
	dev_dbg(kirq->dev, "unmask %lu [%x]\n", d->hwirq, kirq->mask);
}

static void keystone_irq_ack(struct irq_data *d)
{
	/* nothing to do here */
}

static irqreturn_t keystone_irq_handler(int irq, void *keystone_irq)
{
	struct keystone_irq_device *kirq = keystone_irq;
	unsigned long wa_lock_flags;
	unsigned long pending;
	int src, err;

	dev_dbg(kirq->dev, "start irq %d\n", irq);

	pending = keystone_irq_readl(kirq);
	keystone_irq_writel(kirq, pending);

	dev_dbg(kirq->dev, "pending 0x%lx, mask 0x%x\n", pending, kirq->mask);

	pending = (pending >> BIT_OFS) & ~kirq->mask;

	dev_dbg(kirq->dev, "pending after mask 0x%lx\n", pending);

	for (src = 0; src < KEYSTONE_N_IRQ; src++) {
		if (BIT(src) & pending) {
			raw_spin_lock_irqsave(&kirq->wa_lock, wa_lock_flags);
			err = generic_handle_domain_irq(kirq->irqd, src);
			raw_spin_unlock_irqrestore(&kirq->wa_lock,
						   wa_lock_flags);

			if (err)
				dev_warn_ratelimited(kirq->dev, "spurious irq detected hwirq %d\n",
						     src);
		}
	}

	dev_dbg(kirq->dev, "end irq %d\n", irq);
	return IRQ_HANDLED;
}

static int keystone_irq_map(struct irq_domain *h, unsigned int virq,
				irq_hw_number_t hw)

Annotation

Implementation Notes