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Commit eea98334 authored by Pavel Tatashin's avatar Pavel Tatashin Committed by David S. Miller
Browse files

sparc64: broken %tick frequency on spitfire cpus 



After early boot time stamps project the %tick frequency is detected
incorrectly on spittfire cpus.

We must use cpuid of boot cpu to find corresponding cpu node in OpenBoot,
and extract clock-frequency property from there.

Signed-off-by: default avatarPavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fca4afe4

arch/sparc/kernel/time_64.c

+26 −1
Original line number Diff line number Diff line
@@ -162,9 +162,34 @@ static unsigned long tick_add_tick(unsigned long adj) 
	return new_tick;

}



/* Searches for cpu clock frequency with given cpuid in OpenBoot tree */

static unsigned long cpuid_to_freq(phandle node, int cpuid)

{

	bool is_cpu_node = false;

	unsigned long freq = 0;

	char type[128];



	if (!node)

		return freq;



	if (prom_getproperty(node, "device_type", type, sizeof(type)) != -1)

		is_cpu_node = (strcmp(type, "cpu") == 0);



	/* try upa-portis then cpuid to get cpuid, see prom_64.c */

	if (is_cpu_node && (prom_getint(node, "upa-portis") == cpuid ||

			    prom_getint(node, "cpuid") == cpuid))

		freq = prom_getintdefault(node, "clock-frequency", 0);

	if (!freq)

		freq = cpuid_to_freq(prom_getchild(node), cpuid);

	if (!freq)

		freq = cpuid_to_freq(prom_getsibling(node), cpuid);



	return freq;

}



static unsigned long tick_get_frequency(void)

{

	return local_cpu_data().clock_tick;

	return cpuid_to_freq(prom_root_node, hard_smp_processor_id());

}



static struct sparc64_tick_ops tick_operations __cacheline_aligned = {