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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-mvebu/platsmp-a9.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-mvebu/platsmp-a9.c')
-rw-r--r--kernel/arch/arm/mach-mvebu/platsmp-a9.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-mvebu/platsmp-a9.c b/kernel/arch/arm/mach-mvebu/platsmp-a9.c
new file mode 100644
index 000000000..df0a9cc5d
--- /dev/null
+++ b/kernel/arch/arm/mach-mvebu/platsmp-a9.c
@@ -0,0 +1,114 @@
+/*
+ * Symmetric Multi Processing (SMP) support for Marvell EBU Cortex-A9
+ * based SOCs (Armada 375/38x).
+ *
+ * Copyright (C) 2014 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/smp.h>
+#include <linux/mbus.h>
+#include <asm/smp_scu.h>
+#include <asm/smp_plat.h>
+#include "common.h"
+#include "pmsu.h"
+
+extern void mvebu_cortex_a9_secondary_startup(void);
+
+static int __cpuinit mvebu_cortex_a9_boot_secondary(unsigned int cpu,
+ struct task_struct *idle)
+{
+ int ret, hw_cpu;
+
+ pr_info("Booting CPU %d\n", cpu);
+
+ /*
+ * Write the address of secondary startup into the system-wide
+ * flags register. The boot monitor waits until it receives a
+ * soft interrupt, and then the secondary CPU branches to this
+ * address.
+ */
+ hw_cpu = cpu_logical_map(cpu);
+ if (of_machine_is_compatible("marvell,armada375"))
+ mvebu_system_controller_set_cpu_boot_addr(mvebu_cortex_a9_secondary_startup);
+ else
+ mvebu_pmsu_set_cpu_boot_addr(hw_cpu, mvebu_cortex_a9_secondary_startup);
+ smp_wmb();
+
+ /*
+ * Doing this before deasserting the CPUs is needed to wake up CPUs
+ * in the offline state after using CPU hotplug.
+ */
+ arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+ ret = mvebu_cpu_reset_deassert(hw_cpu);
+ if (ret) {
+ pr_err("Could not start the secondary CPU: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+/*
+ * When a CPU is brought back online, either through CPU hotplug, or
+ * because of the boot of a kexec'ed kernel, the PMSU configuration
+ * for this CPU might be in the deep idle state, preventing this CPU
+ * from receiving interrupts. Here, we therefore take out the current
+ * CPU from this state, which was entered by armada_38x_cpu_die()
+ * below.
+ */
+static void armada_38x_secondary_init(unsigned int cpu)
+{
+ mvebu_v7_pmsu_idle_exit();
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void armada_38x_cpu_die(unsigned int cpu)
+{
+ /*
+ * CPU hotplug is implemented by putting offline CPUs into the
+ * deep idle sleep state.
+ */
+ armada_38x_do_cpu_suspend(true);
+}
+
+/*
+ * We need a dummy function, so that platform_can_cpu_hotplug() knows
+ * we support CPU hotplug. However, the function does not need to do
+ * anything, because CPUs going offline can enter the deep idle state
+ * by themselves, without any help from a still alive CPU.
+ */
+static int armada_38x_cpu_kill(unsigned int cpu)
+{
+ return 1;
+}
+#endif
+
+static struct smp_operations mvebu_cortex_a9_smp_ops __initdata = {
+ .smp_boot_secondary = mvebu_cortex_a9_boot_secondary,
+};
+
+static struct smp_operations armada_38x_smp_ops __initdata = {
+ .smp_boot_secondary = mvebu_cortex_a9_boot_secondary,
+ .smp_secondary_init = armada_38x_secondary_init,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = armada_38x_cpu_die,
+ .cpu_kill = armada_38x_cpu_kill,
+#endif
+};
+
+CPU_METHOD_OF_DECLARE(mvebu_armada_375_smp, "marvell,armada-375-smp",
+ &mvebu_cortex_a9_smp_ops);
+CPU_METHOD_OF_DECLARE(mvebu_armada_380_smp, "marvell,armada-380-smp",
+ &armada_38x_smp_ops);
+CPU_METHOD_OF_DECLARE(mvebu_armada_390_smp, "marvell,armada-390-smp",
+ &armada_38x_smp_ops);