From a8cbcd92bd4bf893085eddf7f58e63ea98503d94 Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Sat, 16 May 2009 11:51:14 +0100
Subject: [ARM] smp: separate SCU support code from realview

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ef4f860..f19a951 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -861,6 +861,7 @@ config SMP
 	depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP)
 	depends on GENERIC_CLOCKEVENTS
 	select USE_GENERIC_SMP_HELPERS
+	select HAVE_ARM_SCU if ARCH_REALVIEW
 	help
 	  This enables support for systems with more than one CPU. If you have
 	  a system with only one CPU, like most personal computers, say N. If
@@ -878,6 +879,12 @@ config SMP
 
 	  If you don't know what to do here, say N.
 
+config HAVE_ARM_SCU
+	bool
+	depends on SMP
+	help
+	  This option enables support for the ARM system coherency unit
+
 choice
 	prompt "Memory split"
 	default VMSPLIT_3G
diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h
index d55802d..2376835 100644
--- a/arch/arm/include/asm/smp_scu.h
+++ b/arch/arm/include/asm/smp_scu.h
@@ -1,13 +1,7 @@
 #ifndef __ASMARM_ARCH_SCU_H
 #define __ASMARM_ARCH_SCU_H
 
-/*
- * SCU registers
- */
-#define SCU_CTRL		0x00
-#define SCU_CONFIG		0x04
-#define SCU_CPU_STATUS		0x08
-#define SCU_INVALIDATE		0x0c
-#define SCU_FPGA_REVISION	0x10
+unsigned int scu_get_core_count(void __iomem *);
+void scu_enable(void __iomem *);
 
 #endif
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 11a5197..90ffbaf 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_ARTHUR)		+= arthur.o
 obj-$(CONFIG_ISA_DMA)		+= dma-isa.o
 obj-$(CONFIG_PCI)		+= bios32.o isa.o
 obj-$(CONFIG_SMP)		+= smp.o
+obj-$(CONFIG_HAVE_ARM_SCU)	+= smp_scu.o
 obj-$(CONFIG_DYNAMIC_FTRACE)	+= ftrace.o
 obj-$(CONFIG_KEXEC)		+= machine_kexec.o relocate_kernel.o
 obj-$(CONFIG_KPROBES)		+= kprobes.o kprobes-decode.o
diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c
new file mode 100644
index 0000000..7f24ee9
--- /dev/null
+++ b/arch/arm/kernel/smp_scu.c
@@ -0,0 +1,41 @@
+/*
+ *  linux/arch/arm/kernel/smp_scu.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/io.h>
+
+#include <asm/smp_scu.h>
+
+#define SCU_CTRL		0x00
+#define SCU_CONFIG		0x04
+#define SCU_CPU_STATUS		0x08
+#define SCU_INVALIDATE		0x0c
+#define SCU_FPGA_REVISION	0x10
+
+/*
+ * Get the number of CPU cores from the SCU configuration
+ */
+unsigned int __init scu_get_core_count(void __iomem *scu_base)
+{
+	unsigned int ncores = __raw_readl(scu_base + SCU_CONFIG);
+	return (ncores & 0x03) + 1;
+}
+
+/*
+ * Enable the SCU
+ */
+void __init scu_enable(void __iomem *scu_base)
+{
+	u32 scu_ctrl;
+
+	scu_ctrl = __raw_readl(scu_base + SCU_CTRL);
+	scu_ctrl |= 1;
+	__raw_writel(scu_ctrl, scu_base + SCU_CTRL);
+}
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index c567d3e..c862ce1 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -45,31 +45,12 @@ static void __iomem *scu_base_addr(void)
 		return (void __iomem *)0;
 }
 
-static unsigned int __init get_core_count(void)
+static inline unsigned int get_core_count(void)
 {
-	unsigned int ncores;
 	void __iomem *scu_base = scu_base_addr();
-
-	if (scu_base) {
-		ncores = __raw_readl(scu_base + SCU_CONFIG);
-		ncores = (ncores & 0x03) + 1;
-	} else
-		ncores = 1;
-
-	return ncores;
-}
-
-/*
- * Setup the SCU
- */
-static void scu_enable(void)
-{
-	u32 scu_ctrl;
-	void __iomem *scu_base = scu_base_addr();
-
-	scu_ctrl = __raw_readl(scu_base + SCU_CTRL);
-	scu_ctrl |= 1;
-	__raw_writel(scu_ctrl, scu_base + SCU_CTRL);
+	if (scu_base)
+		return scu_get_core_count(scu_base);
+	return 1;
 }
 
 static DEFINE_SPINLOCK(boot_lock);
@@ -239,7 +220,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 		 */
 		percpu_timer_setup();
 
-		scu_enable();
+		scu_enable(scu_base_addr());
 		poke_milo();
 	}
 }
-- 
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