static int chipco_pctl_clockfreqlimit()

in driver_chipcommon.c [150:209]

• 57 lines of code
• 14 McCabe index (conditional complexity)

static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
{
	int limit;
	enum ssb_clksrc clocksrc;
	int divisor = 1;
	u32 tmp;

	clocksrc = chipco_pctl_get_slowclksrc(cc);
	if (cc->dev->id.revision < 6) {
		switch (clocksrc) {
		case SSB_CHIPCO_CLKSRC_PCI:
			divisor = 64;
			break;
		case SSB_CHIPCO_CLKSRC_XTALOS:
			divisor = 32;
			break;
		default:
			WARN_ON(1);
		}
	} else if (cc->dev->id.revision < 10) {
		switch (clocksrc) {
		case SSB_CHIPCO_CLKSRC_LOPWROS:
			break;
		case SSB_CHIPCO_CLKSRC_XTALOS:
		case SSB_CHIPCO_CLKSRC_PCI:
			tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
			divisor = (tmp >> 16) + 1;
			divisor *= 4;
			break;
		}
	} else {
		tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
		divisor = (tmp >> 16) + 1;
		divisor *= 4;
	}

	switch (clocksrc) {
	case SSB_CHIPCO_CLKSRC_LOPWROS:
		if (get_max)
			limit = 43000;
		else
			limit = 25000;
		break;
	case SSB_CHIPCO_CLKSRC_XTALOS:
		if (get_max)
			limit = 20200000;
		else
			limit = 19800000;
		break;
	case SSB_CHIPCO_CLKSRC_PCI:
		if (get_max)
			limit = 34000000;
		else
			limit = 25000000;
		break;
	}
	limit /= divisor;

	return limit;
}