From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001
From: root <root@artemis.panaceas.org>
Date: Fri, 25 Dec 2015 04:40:36 +0000
Subject: initial_commit

---
 arch/arm/mach-realview/platsmp.c | 90 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 arch/arm/mach-realview/platsmp.c

(limited to 'arch/arm/mach-realview/platsmp.c')

diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
new file mode 100644
index 00000000..963bf0d8
--- /dev/null
+++ b/arch/arm/mach-realview/platsmp.c
@@ -0,0 +1,90 @@
+/*
+ *  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/hardware/gic.h>
+#include <asm/mach-types.h>
+#include <asm/smp_scu.h>
+#include <asm/unified.h>
+
+#include <mach/board-eb.h>
+#include <mach/board-pb11mp.h>
+#include <mach/board-pbx.h>
+
+#include "core.h"
+
+extern void versatile_secondary_startup(void);
+
+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.
+ */
+void __init 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_CPUS) {
+		printk(KERN_WARNING
+		       "Realview: 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;
+
+	/*
+	 * Initialise the present map, which describes the set of CPUs
+	 * actually populated at the present time.
+	 */
+	for (i = 0; i < max_cpus; i++)
+		set_cpu_present(i, true);
+
+	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(BSYM(virt_to_phys(versatile_secondary_startup)),
+		     __io_address(REALVIEW_SYS_FLAGSSET));
+}
-- 
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