[ARM] smp: separate SCU support code from realview

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

2 files changed, 42 insertions, 0 deletions

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 11a5197a221f..90ffbaf23b4e 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 000000000000..7f24ee9d7330
--- /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);
+}