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ARM: vexpress: Select multi-cluster SMP operation if required

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Signed-off-by: Jon Medhurst <[email protected]>
Signed-off-by: Nicolas Pitre <[email protected]>
Reviewed-by: Santosh Shilimkar <[email protected]>
Acked-by: Pawel Moll <[email protected]>
This commit is contained in:
Jon Medhurst 2013-01-30 09:12:55 +00:00 • committed by Nicolas Pitre
commit 033a899c9b
3 changed files with 23 additions and 0 deletions
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2
arch/arm/mach-vexpress/core.h
View file

@ -6,6 +6,8 @@
void vexpress_dt_smp_map_io(void);
bool vexpress_smp_init_ops(void);
extern struct smp_operations vexpress_smp_ops;
extern void vexpress_cpu_die(unsigned int cpu);

20
arch/arm/mach-vexpress/platsmp.c
View file

@ -12,9 +12,11 @@
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/vexpress.h>
#include <asm/mcpm.h>
#include <asm/smp_scu.h>
#include <asm/mach/map.h>
@ -203,3 +205,21 @@ struct smp_operations __initdata vexpress_smp_ops = {
.cpu_die = vexpress_cpu_die,
#endif
};
bool __init vexpress_smp_init_ops(void)
{
#ifdef CONFIG_MCPM
/*
* The best way to detect a multi-cluster configuration at the moment
* is to look for the presence of a CCI in the system.
* Override the default vexpress_smp_ops if so.
*/
struct device_node *node;
node = of_find_compatible_node(NULL, NULL, "arm,cci-400");
if (node && of_device_is_available(node)) {
mcpm_smp_set_ops();
return true;
}
#endif
return false;
}

1
arch/arm/mach-vexpress/v2m.c
View file

@ -456,6 +456,7 @@ static const char * const v2m_dt_match[] __initconst = {
DT_MACHINE_START(VEXPRESS_DT, "ARM-Versatile Express")
.dt_compat = v2m_dt_match,
.smp = smp_ops(vexpress_smp_ops),
.smp_init = smp_init_ops(vexpress_smp_init_ops),
.map_io = v2m_dt_map_io,
.init_early = v2m_dt_init_early,
.init_irq = irqchip_init,