@@ -22,6 +22,7 @@ obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
# SMP support ONLY available for OMAP4
obj-$(CONFIG_SMP) += omap-smp.o omap-headsmp.o
obj-$(CONFIG_LOCAL_TIMERS) += timer-mpu.o
+obj-$(CONFIG_HOTPLUG_CPU) += omap-hotplug.o
obj-$(CONFIG_ARCH_OMAP4) += omap44xx-smc.o omap4-common.o
AFLAGS_omap44xx-smc.o :=-Wa,-march=armv7-a
@@ -13,6 +13,13 @@
#ifndef OMAP_ARCH_OMAP4_COMMON_H
#define OMAP_ARCH_OMAP4_COMMON_H
+/*
+ * wfi used in low power code. Directly opcode is used instead
+ * of instruction to avoid mulit-omap build break
+ */
+#define do_wfi() \
+ __asm__ __volatile__ (".word 0xe320f003" : : : "memory")
+
#ifdef CONFIG_CACHE_L2X0
extern void __iomem *l2cache_base;
#endif
new file mode 100644
@@ -0,0 +1,79 @@
+/*
+ * OMAP4 SMP cpu-hotplug support
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Author:
+ * Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Platform file needed for the OMAP4 SMP. This file is based on arm
+ * realview smp platform.
+ * Copyright (c) 2002 ARM Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+#include <linux/completion.h>
+
+#include <asm/cacheflush.h>
+#include <mach/omap4-common.h>
+
+static DECLARE_COMPLETION(cpu_killed);
+
+int platform_cpu_kill(unsigned int cpu)
+{
+ return wait_for_completion_timeout(&cpu_killed, 5000);
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ * Called with IRQs disabled
+ */
+void platform_cpu_die(unsigned int cpu)
+{
+ unsigned int this_cpu = hard_smp_processor_id();
+
+ if (cpu != this_cpu) {
+ pr_crit("platform_cpu_die running on %u, should be %u\n",
+ this_cpu, cpu);
+ BUG();
+ }
+ pr_notice("CPU%u: shutdown\n", cpu);
+ complete(&cpu_killed);
+ flush_cache_all();
+ dsb();
+
+ /*
+ * we're ready for shutdown now, so do it
+ */
+ if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
+ printk(KERN_CRIT "Secure clear status failed\n");
+
+ for (;;) {
+ /*
+ * Execute WFI
+ */
+ do_wfi();
+
+ if (omap_read_auxcoreboot0() == cpu) {
+ /*
+ * OK, proper wakeup, we're done
+ */
+ break;
+ }
+ pr_debug("CPU%u: spurious wakeup call\n", cpu);
+ }
+}
+
+int platform_cpu_disable(unsigned int cpu)
+{
+ /*
+ * we don't allow CPU 0 to be shutdown (it is still too special
+ * e.g. clock tick interrupts)
+ */
+ return cpu == 0 ? -EPERM : 0;
+}
@@ -73,9 +73,10 @@ int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
* the AuxCoreBoot1 register is updated with cpu state
* A barrier is added to ensure that write buffer is drained
*/
- omap_modify_auxcoreboot0(0x200, 0x0);
+ omap_modify_auxcoreboot0(0x200, 0xfffffdff);
flush_cache_all();
smp_wmb();
+ smp_cross_call(cpumask_of(cpu));
/*
* Now the secondary core is starting up let it run its