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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2009-05-16 11:51:14 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-05-17 19:00:37 +0100
commita8cbcd92bd4bf893085eddf7f58e63ea98503d94 (patch)
tree7798cd1487362208793632f4ff0b4a6f579eb0ec /arch/arm/kernel/smp_scu.c
parent49613d4d9ae759193915823e67de546fca58c951 (diff)
downloadlinux-a8cbcd92bd4bf893085eddf7f58e63ea98503d94.tar.bz2
[ARM] smp: separate SCU support code from realview
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/smp_scu.c')
-rw-r--r--arch/arm/kernel/smp_scu.c41
1 files changed, 41 insertions, 0 deletions
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);
+}