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-rw-r--r--kernel/arch/arm/mach-realview/platsmp.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-realview/platsmp.c b/kernel/arch/arm/mach-realview/platsmp.c
new file mode 100644
index 000000000..98e3052b7
--- /dev/null
+++ b/kernel/arch/arm/mach-realview/platsmp.c
@@ -0,0 +1,86 @@
+/*
+ * linux/arch/arm/mach-realview/platsmp.c
+ *
+ * Copyright (C) 2002 ARM Ltd.
+ * All Rights Reserved
+ *
+ * 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/init.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <asm/mach-types.h>
+#include <asm/smp_scu.h>
+
+#include <mach/board-eb.h>
+#include <mach/board-pb11mp.h>
+#include <mach/board-pbx.h>
+
+#include <plat/platsmp.h>
+
+#include "core.h"
+
+static void __iomem *scu_base_addr(void)
+{
+ if (machine_is_realview_eb_mp())
+ return __io_address(REALVIEW_EB11MP_SCU_BASE);
+ else if (machine_is_realview_pb11mp())
+ return __io_address(REALVIEW_TC11MP_SCU_BASE);
+ else if (machine_is_realview_pbx() &&
+ (core_tile_pbx11mp() || core_tile_pbxa9mp()))
+ return __io_address(REALVIEW_PBX_TILE_SCU_BASE);
+ else
+ return (void __iomem *)0;
+}
+
+/*
+ * Initialise the CPU possible map early - this describes the CPUs
+ * which may be present or become present in the system.
+ */
+static void __init realview_smp_init_cpus(void)
+{
+ void __iomem *scu_base = scu_base_addr();
+ unsigned int i, ncores;
+
+ ncores = scu_base ? scu_get_core_count(scu_base) : 1;
+
+ /* sanity check */
+ if (ncores > nr_cpu_ids) {
+ pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
+ ncores, nr_cpu_ids);
+ ncores = nr_cpu_ids;
+ }
+
+ for (i = 0; i < ncores; i++)
+ set_cpu_possible(i, true);
+}
+
+static void __init realview_smp_prepare_cpus(unsigned int max_cpus)
+{
+
+ scu_enable(scu_base_addr());
+
+ /*
+ * Write the address of secondary startup into the
+ * system-wide flags register. The BootMonitor waits
+ * until it receives a soft interrupt, and then the
+ * secondary CPU branches to this address.
+ */
+ __raw_writel(virt_to_phys(versatile_secondary_startup),
+ __io_address(REALVIEW_SYS_FLAGSSET));
+}
+
+struct smp_operations realview_smp_ops __initdata = {
+ .smp_init_cpus = realview_smp_init_cpus,
+ .smp_prepare_cpus = realview_smp_prepare_cpus,
+ .smp_secondary_init = versatile_secondary_init,
+ .smp_boot_secondary = versatile_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = realview_cpu_die,
+#endif
+};