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ARM: msm: platsmp: determine number of CPU cores at boot time 

Previously we just assumed there were CONFIG_NR_CPUS cpus present in
the system. Instead, figure out the number of cpus from the MIDR
register.

Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
[arnd: clarified patch title]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Jeff Ohlstein 2011-04-07 17:41:09 -07:00 committed by Arnd Bergmann
parent 620917de59
commit 41ff445cdb
1 changed files with 9 additions and 2 deletions
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11
arch/arm/mach-msm/platsmp.c
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@ -18,6 +18,7 @@
#include <asm/hardware/gic.h>
#include <asm/cacheflush.h>
#include <asm/cputype.h>
#include <asm/mach-types.h>
#include <mach/msm_iomap.h>
@ -40,6 +41,12 @@ volatile int pen_release = -1;
static DEFINE_SPINLOCK(boot_lock);
static inline int get_core_count(void)
{
/* 1 + the PART[1:0] field of MIDR */
return ((read_cpuid_id() >> 4) & 3) + 1;
}
void __cpuinit platform_secondary_init(unsigned int cpu)
{
/* Configure edge-triggered PPIs */
@ -147,9 +154,9 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
*/
void __init smp_init_cpus(void)
{
unsigned int i;
unsigned int i, ncores = get_core_count();
for (i = 0; i < NR_CPUS; i++)
for (i = 0; i < ncores; i++)
set_cpu_possible(i, true);
set_smp_cross_call(gic_raise_softirq);