Merge branch 'smp' into misc

Conflicts:
	arch/arm/kernel/entry-armv.S
	arch/arm/mm/ioremap.c

3 files changed, 25 insertions, 64 deletions

diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c
index 8e7f115..a5cb1ce 100644
--- a/arch/arm/mach-tegra/hotplug.c
+++ b/arch/arm/mach-tegra/hotplug.c
@@ -11,12 +11,9 @@
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/smp.h>
-#include <linux/completion.h>
 
 #include <asm/cacheflush.h>
 
-static DECLARE_COMPLETION(cpu_killed);
-
 static inline void cpu_enter_lowpower(void)
 {
 	unsigned int v;
@@ -29,13 +26,13 @@ static inline void cpu_enter_lowpower(void)
 	 * Turn off coherency
 	 */
 	"	mrc	p15, 0, %0, c1, c0, 1\n"
-	"	bic	%0, %0, #0x20\n"
+	"	bic	%0, %0, %2\n"
 	"	mcr	p15, 0, %0, c1, c0, 1\n"
 	"	mrc	p15, 0, %0, c1, c0, 0\n"
 	"	bic	%0, %0, #0x04\n"
 	"	mcr	p15, 0, %0, c1, c0, 0\n"
 	  : "=&r" (v)
-	  : "r" (0)
+	  : "r" (0), "Ir" (CR_C)
 	  : "cc");
 }
 
@@ -45,17 +42,17 @@ static inline void cpu_leave_lowpower(void)
 
 	asm volatile(
 	"mrc	p15, 0, %0, c1, c0, 0\n"
-	"	orr	%0, %0, #0x04\n"
+	"	orr	%0, %0, %1\n"
 	"	mcr	p15, 0, %0, c1, c0, 0\n"
 	"	mrc	p15, 0, %0, c1, c0, 1\n"
 	"	orr	%0, %0, #0x20\n"
 	"	mcr	p15, 0, %0, c1, c0, 1\n"
 	  : "=&r" (v)
-	  :
+	  : "Ir" (CR_C)
 	  : "cc");
 }
 
-static inline void platform_do_lowpower(unsigned int cpu)
+static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
 {
 	/*
 	 * there is no power-control hardware on this platform, so all
@@ -79,22 +76,19 @@ static inline void platform_do_lowpower(unsigned int cpu)
 		/*}*/
 
 		/*
-		 * getting here, means that we have come out of WFI without
+		 * Getting here, means that we have come out of WFI without
 		 * having been woken up - this shouldn't happen
 		 *
-		 * The trouble is, letting people know about this is not really
-		 * possible, since we are currently running incoherently, and
-		 * therefore cannot safely call printk() or anything else
+		 * Just note it happening - when we're woken, we can report
+		 * its occurrence.
 		 */
-#ifdef DEBUG
-		printk(KERN_WARN "CPU%u: spurious wakeup call\n", cpu);
-#endif
+		(*spurious)++;
 	}
 }
 
 int platform_cpu_kill(unsigned int cpu)
 {
-	return wait_for_completion_timeout(&cpu_killed, 5000);
+	return 1;
 }
 
 /*
@@ -104,30 +98,22 @@ int platform_cpu_kill(unsigned int cpu)
  */
 void platform_cpu_die(unsigned int cpu)
 {
-#ifdef DEBUG
-	unsigned int this_cpu = hard_smp_processor_id();
-
-	if (cpu != this_cpu) {
-		printk(KERN_CRIT "Eek! platform_cpu_die running on %u, should be %u\n",
-			   this_cpu, cpu);
-		BUG();
-	}
-#endif
-
-	printk(KERN_NOTICE "CPU%u: shutdown\n", cpu);
-	complete(&cpu_killed);
+	int spurious = 0;
 
 	/*
 	 * we're ready for shutdown now, so do it
 	 */
 	cpu_enter_lowpower();
-	platform_do_lowpower(cpu);
+	platform_do_lowpower(cpu, &spurious);
 
 	/*
 	 * bring this CPU back into the world of cache
 	 * coherency, and then restore interrupts
 	 */
 	cpu_leave_lowpower();
+
+	if (spurious)
+		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
 }
 
 int platform_cpu_disable(unsigned int cpu)
diff --git a/arch/arm/mach-tegra/include/mach/smp.h b/arch/arm/mach-tegra/include/mach/smp.h
index e4a34a3..c8221b3 100644
--- a/arch/arm/mach-tegra/include/mach/smp.h
+++ b/arch/arm/mach-tegra/include/mach/smp.h
@@ -2,21 +2,13 @@
 #define ASMARM_ARCH_SMP_H
 
 #include <asm/hardware/gic.h>
-#include <asm/smp_mpidr.h>
 
 /*
  * We use IRQ1 as the IPI
  */
-static inline void smp_cross_call(const struct cpumask *mask)
-{
-	gic_raise_softirq(mask, 1);
-}
-
-/*
- * Do nothing on MPcore.
- */
-static inline void smp_cross_call_done(cpumask_t callmap)
+static inline void smp_cross_call(const struct cpumask *mask, int ipi)
 {
+	gic_raise_softirq(mask, ipi);
 }
 
 #endif
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index 1c0fd92..c729cd7 100644
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -22,7 +22,6 @@
 #include <asm/cacheflush.h>
 #include <mach/hardware.h>
 #include <asm/mach-types.h>
-#include <asm/localtimer.h>
 #include <asm/smp_scu.h>
 
 #include <mach/iomap.h>
@@ -41,8 +40,6 @@ static void __iomem *scu_base = IO_ADDRESS(TEGRA_ARM_PERIF_BASE);
 
 void __cpuinit platform_secondary_init(unsigned int cpu)
 {
-	trace_hardirqs_off();
-
 	/*
 	 * if any interrupts are already enabled for the primary
 	 * core (e.g. timer irq), then they will not have been enabled
@@ -117,24 +114,20 @@ void __init smp_init_cpus(void)
 {
 	unsigned int i, ncores = scu_get_core_count(scu_base);
 
+	if (ncores > NR_CPUS) {
+		printk(KERN_ERR "Tegra: no. of cores (%u) greater than configured (%u), clipping\n",
+			ncores, NR_CPUS);
+		ncores = NR_CPUS;
+	}
+
 	for (i = 0; i < ncores; i++)
 		cpu_set(i, cpu_possible_map);
 }
 
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
 {
-	unsigned int ncores = scu_get_core_count(scu_base);
-	unsigned int cpu = smp_processor_id();
 	int i;
 
-	smp_store_cpu_info(cpu);
-
-	/*
-	 * are we trying to boot more cores than exist?
-	 */
-	if (max_cpus > ncores)
-		max_cpus = ncores;
-
 	/*
 	 * Initialise the present map, which describes the set of CPUs
 	 * actually populated at the present time.
@@ -142,15 +135,5 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 	for (i = 0; i < max_cpus; i++)
 		set_cpu_present(i, true);
 
-	/*
-	 * Initialise the SCU if there are more than one CPU and let
-	 * them know where to start. Note that, on modern versions of
-	 * MILO, the "poke" doesn't actually do anything until each
-	 * individual core is sent a soft interrupt to get it out of
-	 * WFI
-	 */
-	if (max_cpus > 1) {
-		percpu_timer_setup();
-		scu_enable(scu_base);
-	}
+	scu_enable(scu_base);
 }