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Diffstat (limited to 'arch/arm/kernel/smp_scu.c')
-rw-r--r--arch/arm/kernel/smp_scu.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp_scu.c b/arch/arm/kernel/smp_scu.c
new file mode 100644
index 00000000000..d3831f616ee
--- /dev/null
+++ b/arch/arm/kernel/smp_scu.c
@@ -0,0 +1,48 @@
+/*
+ * 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>
+#include <asm/cacheflush.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);
+
+ /*
+ * Ensure that the data accessed by CPU0 before the SCU was
+ * initialised is visible to the other CPUs.
+ */
+ flush_cache_all();
+}