static irqreturn_t isr()

in ptp_pch.c [342:387]

• 41 lines of code
• 7 McCabe index (conditional complexity)

static irqreturn_t isr(int irq, void *priv)
{
	struct pch_dev *pch_dev = priv;
	struct pch_ts_regs __iomem *regs = pch_dev->regs;
	struct ptp_clock_event event;
	u32 ack = 0, lo, hi, val;

	val = ioread32(&regs->event);

	if (val & PCH_TSE_SNS) {
		ack |= PCH_TSE_SNS;
		if (pch_dev->exts0_enabled) {
			hi = ioread32(&regs->asms_hi);
			lo = ioread32(&regs->asms_lo);
			event.type = PTP_CLOCK_EXTTS;
			event.index = 0;
			event.timestamp = ((u64) hi) << 32;
			event.timestamp |= lo;
			event.timestamp <<= TICKS_NS_SHIFT;
			ptp_clock_event(pch_dev->ptp_clock, &event);
		}
	}

	if (val & PCH_TSE_SNM) {
		ack |= PCH_TSE_SNM;
		if (pch_dev->exts1_enabled) {
			hi = ioread32(&regs->amms_hi);
			lo = ioread32(&regs->amms_lo);
			event.type = PTP_CLOCK_EXTTS;
			event.index = 1;
			event.timestamp = ((u64) hi) << 32;
			event.timestamp |= lo;
			event.timestamp <<= TICKS_NS_SHIFT;
			ptp_clock_event(pch_dev->ptp_clock, &event);
		}
	}

	if (val & PCH_TSE_TTIPEND)
		ack |= PCH_TSE_TTIPEND; /* this bit seems to be always set */

	if (ack) {
		iowrite32(ack, &regs->event);
		return IRQ_HANDLED;
	} else
		return IRQ_NONE;
}