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Message-ID: <1343092165-9470-23-git-send-email-cyril@ti.com>
Date: Mon, 23 Jul 2012 21:09:24 -0400
From: Cyril Chemparathy <cyril@...com>
To: <linux-arm-kernel@...ts.infradead.org>
CC: <linux-kernel@...r.kernel.org>, <nico@...aro.org>,
<will.deacon@....com>, <catalin.marinas@....com>,
Cyril Chemparathy <cyril@...com>,
Vitaly Andrianov <vitalya@...com>
Subject: [RFC 22/23] ARM: keystone: enable SMP on Keystone machines
This patch adds basic SMP support for Keystone machines. Nothing very fancy
here, just enough to get 4 CPUs booted up. This does not include support for
hotplug, etc.
Signed-off-by: Vitaly Andrianov <vitalya@...com>
Signed-off-by: Cyril Chemparathy <cyril@...com>
---
arch/arm/Kconfig | 1 +
arch/arm/configs/keystone_defconfig | 2 +
arch/arm/mach-keystone/Makefile | 1 +
arch/arm/mach-keystone/keystone.c | 3 ++
arch/arm/mach-keystone/platsmp.c | 73 +++++++++++++++++++++++++++++++++++
5 files changed, 80 insertions(+)
create mode 100644 arch/arm/mach-keystone/platsmp.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 04c846b..5b82879 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -372,6 +372,7 @@ config ARCH_KEYSTONE
select SPARSE_IRQ
select NEED_MACH_MEMORY_H
select HAVE_SCHED_CLOCK
+ select HAVE_SMP
help
Support for boards based on the Texas Instruments Keystone family of
SoCs.
diff --git a/arch/arm/configs/keystone_defconfig b/arch/arm/configs/keystone_defconfig
index 7f2a04b..5f71e66 100644
--- a/arch/arm/configs/keystone_defconfig
+++ b/arch/arm/configs/keystone_defconfig
@@ -1,7 +1,9 @@
CONFIG_EXPERIMENTAL=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_ARCH_KEYSTONE=y
+CONFIG_SMP=y
CONFIG_ARM_ARCH_TIMER=y
+CONFIG_NR_CPUS=4
CONFIG_AEABI=y
CONFIG_HIGHMEM=y
CONFIG_VFP=y
diff --git a/arch/arm/mach-keystone/Makefile b/arch/arm/mach-keystone/Makefile
index d4671d5..3f6b8ab 100644
--- a/arch/arm/mach-keystone/Makefile
+++ b/arch/arm/mach-keystone/Makefile
@@ -1 +1,2 @@
obj-y := keystone.o
+obj-$(CONFIG_SMP) += platsmp.o
diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index 9583dc4..650e202 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -26,6 +26,8 @@
#include <asm/mach/time.h>
#include <asm/hardware/gic.h>
+extern struct smp_ops keystone_smp_ops;
+
static struct map_desc io_desc[] = {
{
.virtual = 0xfe800000UL,
@@ -73,6 +75,7 @@ static const char *keystone_match[] __initconst = {
};
DT_MACHINE_START(KEYSTONE, "Keystone")
+ smp_ops(keystone_smp_ops)
.map_io = keystone_map_io,
.init_irq = keystone_init_irq,
.timer = &keystone_timer,
diff --git a/arch/arm/mach-keystone/platsmp.c b/arch/arm/mach-keystone/platsmp.c
new file mode 100644
index 0000000..437659a
--- /dev/null
+++ b/arch/arm/mach-keystone/platsmp.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2012 Texas Instruments, Inc.
+ *
+ * Based on platsmp.c, Copyright 2010-2011 Calxeda, Inc.
+ * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+
+#include <asm/smp_plat.h>
+#include <asm/smp_ops.h>
+#include <asm/hardware/gic.h>
+#include <asm/cacheflush.h>
+#include <asm/memory.h>
+
+extern void secondary_startup(void);
+
+static void __init keystone_smp_init_cpus(void)
+{
+ unsigned int i, ncores;
+
+ ncores = 4;
+
+ /* sanity check */
+ if (ncores > NR_CPUS) {
+ pr_warn("restricted to %d cpus\n", NR_CPUS);
+ ncores = NR_CPUS;
+ }
+
+ for (i = 0; i < ncores; i++)
+ set_cpu_possible(i, true);
+
+ set_smp_cross_call(gic_raise_softirq);
+}
+
+static void __init keystone_smp_prepare_cpus(unsigned int max_cpus)
+{
+ /* nothing for now */
+}
+
+static void __cpuinit keystone_secondary_init(unsigned int cpu)
+{
+ gic_secondary_init(0);
+}
+
+static int __cpuinit
+keystone_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ unsigned long *jump_ptr = phys_to_virt(0x800001f0);
+
+ jump_ptr[cpu] = virt_to_idmap(&secondary_startup);
+ __cpuc_flush_dcache_area(jump_ptr, sizeof(jump_ptr) * 4);
+
+ return 0;
+}
+
+struct smp_ops keystone_smp_ops __initdata = {
+ smp_init_ops(keystone)
+ smp_secondary_ops(keystone)
+};
--
1.7.9.5
--
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