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ARM: mvebu: add a coherency_available() call 

This commit extends the coherency fabric code to provide a
coherency_available()function that the SoC code can call to be told
whether coherency support is available or not. On Armada 370/XP,
coherency support is available as soon as the relevant DT node is
present. On some upcoming SoCs, the DT node needs to be present *and*
the system running with CONFIG_SMP enabled.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483228-25625-3-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Thomas Petazzoni 2014-04-14 15:47:00 +02:00 committed by Jason Cooper
parent 924d38f404
commit 501f928e00
2 changed files with 24 additions and 9 deletions
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32
arch/arm/mach-mvebu/coherency.c
View File

@ -39,6 +39,7 @@ static void __iomem *coherency_cpu_base;
#define IO_SYNC_BARRIER_CTL_OFFSET 0x0
enum {
COHERENCY_FABRIC_TYPE_NONE,
COHERENCY_FABRIC_TYPE_ARMADA_370_XP,
};
@ -144,7 +145,7 @@ static void __init armada_370_coherency_init(struct device_node *np)
set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
}
int __init coherency_init(void)
static int coherency_type(void)
{
struct device_node *np;
@ -155,27 +156,40 @@ int __init coherency_init(void)
int type;
type = (int) match->data;
pr_info("Initializing Coherency fabric\n");
/* Armada 370/XP coherency works in both UP and SMP */
if (type == COHERENCY_FABRIC_TYPE_ARMADA_370_XP)
armada_370_coherency_init(np);
return type;
of_node_put(np);
}
return COHERENCY_FABRIC_TYPE_NONE;
}
int coherency_available(void)
{
return coherency_type() != COHERENCY_FABRIC_TYPE_NONE;
}
int __init coherency_init(void)
{
int type = coherency_type();
struct device_node *np;
np = of_find_matching_node(NULL, of_coherency_table);
if (type == COHERENCY_FABRIC_TYPE_ARMADA_370_XP)
armada_370_coherency_init(np);
return 0;
}
static int __init coherency_late_init(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, of_coherency_table);
if (np) {
if (coherency_available())
bus_register_notifier(&platform_bus_type,
&mvebu_hwcc_platform_nb);
of_node_put(np);
}
return 0;
}

1
arch/arm/mach-mvebu/coherency.h
View File

@ -18,5 +18,6 @@ extern unsigned long coherency_phys_base;
int set_cpu_coherent(unsigned int cpu_id, int smp_group_id);
int coherency_init(void);
int coherency_available(void);
#endif /* __MACH_370_XP_COHERENCY_H */