summaryrefslogtreecommitdiffstats
path: root/kernel/arch/arm/mach-omap2/omap-hotplug.c
diff options
context:
space:
mode:
authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm/mach-omap2/omap-hotplug.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm/mach-omap2/omap-hotplug.c')
-rw-r--r--kernel/arch/arm/mach-omap2/omap-hotplug.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-omap2/omap-hotplug.c b/kernel/arch/arm/mach-omap2/omap-hotplug.c
new file mode 100644
index 000000000..971791fe9
--- /dev/null
+++ b/kernel/arch/arm/mach-omap2/omap-hotplug.c
@@ -0,0 +1,66 @@
+/*
+ * 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/io.h>
+
+#include "omap-wakeupgen.h"
+#include "common.h"
+#include "powerdomain.h"
+
+/*
+ * platform-specific code to shutdown a CPU
+ * Called with IRQs disabled
+ */
+void __ref omap4_cpu_die(unsigned int cpu)
+{
+ unsigned int boot_cpu = 0;
+ void __iomem *base = omap_get_wakeupgen_base();
+
+ /*
+ * we're ready for shutdown now, so do it
+ */
+ if (omap_secure_apis_support()) {
+ if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
+ pr_err("Secure clear status failed\n");
+ } else {
+ writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0);
+ }
+
+
+ for (;;) {
+ /*
+ * Enter into low power state
+ */
+ omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
+
+ if (omap_secure_apis_support())
+ boot_cpu = omap_read_auxcoreboot0();
+ else
+ boot_cpu =
+ readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5;
+
+ if (boot_cpu == smp_processor_id()) {
+ /*
+ * OK, proper wakeup, we're done
+ */
+ break;
+ }
+ pr_debug("CPU%u: spurious wakeup call\n", cpu);
+ }
+}