[PATCH] ARM SMP: Add basic support Integrator/CP platform

Add basic SMP support for the Integrator/CP platform.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 23 insertions, 2 deletions

diff --git a/arch/arm/mach-integrator/Makefile b/arch/arm/mach-integrator/Makefile
index 158daaf9e3b0..ebb255bdce8a 100644
--- a/arch/arm/mach-integrator/Makefile
+++ b/arch/arm/mach-integrator/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_LEDS)			+= leds.o
 obj-$(CONFIG_PCI)                       += pci_v3.o pci.o
 obj-$(CONFIG_CPU_FREQ_INTEGRATOR)       += cpu.o
 obj-$(CONFIG_INTEGRATOR_IMPD1)          += impd1.o
+obj-$(CONFIG_SMP)                       += platsmp.o headsmp.o
diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c
index bd17b5154311..d302f0405fd2 100644
--- a/arch/arm/mach-integrator/core.c
+++ b/arch/arm/mach-integrator/core.c
@@ -14,6 +14,7 @@
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
 #include <linux/sched.h>
+#include <linux/smp.h>
 
 #include <asm/hardware.h>
 #include <asm/irq.h>
@@ -221,7 +222,24 @@ integrator_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
          */
         timer1->TimerClear = 1;
 
-        timer_tick(regs);
+        /*
+         * the clock tick routines are only processed on the
+         * primary CPU
+         */
+        if (hard_smp_processor_id() == 0) {
+                nmi_tick();
+                timer_tick(regs);
+#ifdef CONFIG_SMP
+                smp_send_timer();
+#endif
+        }
+
+#ifdef CONFIG_SMP
+        /*
+         * this is the ARM equivalent of the APIC timer interrupt
+         */
+        update_process_times(user_mode(regs));
+#endif /* CONFIG_SMP */
 
         write_sequnlock(&xtime_lock);
 
diff --git a/arch/arm/mach-integrator/leds.c b/arch/arm/mach-integrator/leds.c
index d2c0ab21150c..f1436e683b49 100644
--- a/arch/arm/mach-integrator/leds.c
+++ b/arch/arm/mach-integrator/leds.c
@@ -22,6 +22,8 @@
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
 
 #include <asm/hardware.h>
 #include <asm/io.h>
@@ -85,4 +87,4 @@ static int __init leds_init(void)
         return 0;
 }
 
-__initcall(leds_init);
+core_initcall(leds_init);