ARM: highbank: add SMP support

This enables SMP support on highbank processor.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Shawn Guo <shawn.guo@linaro.org>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 887b818..b02e85b 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1416,7 +1416,7 @@ config SMP
        depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
                 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
                 ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \
-                ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE
+                ARCH_MSM_SCORPIONMP || ARCH_SHMOBILE || ARCH_HIGHBANK
        select USE_GENERIC_SMP_HELPERS
        select HAVE_ARM_SCU if !ARCH_MSM_SCORPIONMP
        help

diff --git a/arch/arm/mach-highbank/Makefile b/arch/arm/mach-highbank/Makefile
index da7f81a..89c736f 100644 (file)
--- a/arch/arm/mach-highbank/Makefile
+++ b/arch/arm/mach-highbank/Makefile
@@ -1,2 +1,4 @@
 obj-y                                  := clock.o highbank.o system.o
 obj-$(CONFIG_DEBUG_HIGHBANK_UART)      += lluart.o
+obj-$(CONFIG_SMP)                      += platsmp.o
+obj-$(CONFIG_LOCAL_TIMERS)             += localtimer.o

diff --git a/arch/arm/mach-highbank/localtimer.c b/arch/arm/mach-highbank/localtimer.c
new file mode 100644 (file)
index 0000000..5a00e79
--- /dev/null
+++ b/arch/arm/mach-highbank/localtimer.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2011 Calxeda, Inc.
+ * Based on localtimer.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/clockchips.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#include <asm/smp_twd.h>
+
+/*
+ * Setup the local clock events for a CPU.
+ */
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
+{
+       struct device_node *np;
+
+       np = of_find_compatible_node(NULL, NULL, "arm,smp-twd");
+       if (!twd_base) {
+               twd_base = of_iomap(np, 0);
+               WARN_ON(!twd_base);
+       }
+       evt->irq = irq_of_parse_and_map(np, 0);
+       twd_timer_setup(evt);
+       return 0;
+}

diff --git a/arch/arm/mach-highbank/platsmp.c b/arch/arm/mach-highbank/platsmp.c
new file mode 100644 (file)
index 0000000..d01364c
--- /dev/null
+++ b/arch/arm/mach-highbank/platsmp.c
@@ -0,0 +1,78 @@
+/*
+ * 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_scu.h>
+#include <asm/hardware/gic.h>
+
+#include "core.h"
+
+extern void secondary_startup(void);
+
+void __cpuinit platform_secondary_init(unsigned int cpu)
+{
+       gic_secondary_init(0);
+}
+
+int __cpuinit boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+       gic_raise_softirq(cpumask_of(cpu), 0);
+       return 0;
+}
+
+/*
+ * Initialise the CPU possible map early - this describes the CPUs
+ * which may be present or become present in the system.
+ */
+void __init smp_init_cpus(void)
+{
+       unsigned int i, ncores;
+
+       ncores = scu_get_core_count(scu_base_addr);
+
+       /* sanity check */
+       if (ncores > NR_CPUS) {
+               printk(KERN_WARNING
+                      "highbank: no. of cores (%d) greater than configured "
+                      "maximum of %d - clipping\n",
+                      ncores, NR_CPUS);
+               ncores = NR_CPUS;
+       }
+
+       for (i = 0; i < ncores; i++)
+               set_cpu_possible(i, true);
+
+       set_smp_cross_call(gic_raise_softirq);
+}
+
+void __init platform_smp_prepare_cpus(unsigned int max_cpus)
+{
+       int i;
+
+       scu_enable(scu_base_addr);
+
+       /*
+        * Write the address of secondary startup into the jump table
+        * The cores are in wfi and wait until they receive a soft interrupt
+        * and a non-zero value to jump to. Then the secondary CPU branches
+        * to this address.
+        */
+       for (i = 1; i < max_cpus; i++)
+               highbank_set_cpu_jump(i, secondary_startup);
+}