drivers/clocksource/timer-econet-en751221.c

Source file repositories/reference/linux-study-clean/drivers/clocksource/timer-econet-en751221.c

File Facts

System
Linux kernel
Corpus path
drivers/clocksource/timer-econet-en751221.c
Extension
.c
Size
5174 bytes
Lines
217
Domain
Driver Families
Bucket
drivers/clocksource
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

if (!econet_timer.membase[i]) {
			pr_err("%pOFn: failed to map register [%d]\n", np, i);
			return -ENXIO;
		}
	}

	/* For clocksource purposes always read clock zero, whatever the CPU */
	ret = clocksource_mmio_init(reg_count(0), np->name,
				    econet_timer.freq_hz, 301, ECONET_BITS,
				    clocksource_mmio_readl_up);
	if (ret) {
		pr_err("%pOFn: clocksource_mmio_init failed: %d", np, ret);
		return ret;
	}

	ret = cevt_init(np);
	if (ret < 0)
		return ret;

	sched_clock_register(sched_clock_read, ECONET_BITS,
			     econet_timer.freq_hz);

	pr_info("%pOFn: using %u.%03u MHz high precision timer\n", np,
		econet_timer.freq_hz / 1000000,
		(econet_timer.freq_hz / 1000) % 1000);

	return 0;
}

TIMER_OF_DECLARE(econet_timer_hpt, "econet,en751221-timer", timer_init);

Annotation

Implementation Notes