ARM: socfpga: Enable SMP for socfpga
Enable SMP for the SOCFPGA platform.
Signed-off-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Reviewed-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/arch/arm/mach-socfpga/platsmp.c b/arch/arm/mach-socfpga/platsmp.c
new file mode 100644
index 0000000..68dd1b6
--- /dev/null
+++ b/arch/arm/mach-socfpga/platsmp.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2010-2011 Calxeda, Inc.
+ * Copyright 2012 Pavel Machek <pavel@denx.de>
+ * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
+ * Copyright (C) 2012 Altera Corporation
+ *
+ * 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/delay.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/cacheflush.h>
+#include <asm/hardware/gic.h>
+#include <asm/smp_scu.h>
+#include <asm/smp_plat.h>
+
+#include "core.h"
+
+extern void __iomem *sys_manager_base_addr;
+extern void __iomem *rst_manager_base_addr;
+
+static void __cpuinit socfpga_secondary_init(unsigned int cpu)
+{
+ /*
+ * if any interrupts are already enabled for the primary
+ * core (e.g. timer irq), then they will not have been enabled
+ * for us: do so
+ */
+ gic_secondary_init(0);
+}
+
+static int __cpuinit socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
+
+ memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
+
+ __raw_writel(virt_to_phys(secondary_startup), (sys_manager_base_addr+0x10));
+
+ flush_cache_all();
+ smp_wmb();
+ outer_clean_range(0, trampoline_size);
+
+ /* This will release CPU #1 out of reset.*/
+ __raw_writel(0, rst_manager_base_addr + 0x10);
+
+ return 0;
+}
+
+/*
+ * Initialise the CPU possible map early - this describes the CPUs
+ * which may be present or become present in the system.
+ */
+static void __init socfpga_smp_init_cpus(void)
+{
+ unsigned int i, ncores;
+
+ ncores = scu_get_core_count(socfpga_scu_base_addr);
+
+ for (i = 0; i < ncores; i++)
+ set_cpu_possible(i, true);
+
+ /* sanity check */
+ if (ncores > num_possible_cpus()) {
+ pr_warn("socfpga: no. of cores (%d) greater than configured"
+ "maximum of %d - clipping\n", ncores, num_possible_cpus());
+ ncores = num_possible_cpus();
+ }
+
+ for (i = 0; i < ncores; i++)
+ set_cpu_possible(i, true);
+
+ set_smp_cross_call(gic_raise_softirq);
+}
+
+static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
+{
+ scu_enable(socfpga_scu_base_addr);
+}
+
+/*
+ * platform-specific code to shutdown a CPU
+ *
+ * Called with IRQs disabled
+ */
+static void socfpga_cpu_die(unsigned int cpu)
+{
+ cpu_do_idle();
+
+ /* We should have never returned from idle */
+ panic("cpu %d unexpectedly exit from shutdown\n", cpu);
+}
+
+struct smp_operations socfpga_smp_ops __initdata = {
+ .smp_init_cpus = socfpga_smp_init_cpus,
+ .smp_prepare_cpus = socfpga_smp_prepare_cpus,
+ .smp_secondary_init = socfpga_secondary_init,
+ .smp_boot_secondary = socfpga_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = socfpga_cpu_die,
+#endif
+};