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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
parent49613d4d9ae759193915823e67de546fca58c951 (diff)
[ARM] smp: separate SCU support code from realview
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/Kconfig7
-rw-r--r--arch/arm/include/asm/smp_scu.h10
-rw-r--r--arch/arm/kernel/Makefile1
-rw-r--r--arch/arm/kernel/smp_scu.c41
-rw-r--r--arch/arm/mach-realview/platsmp.c29
5 files changed, 56 insertions, 32 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ef4f860d504..f19a9519a72 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 d55802d645a..2376835015d 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 11a5197a221..90ffbaf23b4 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 00000000000..7f24ee9d733
--- /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 c567d3e2444..c862ce19587 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();
}
}