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[ARM] smp: separate SCU support code from realview 

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2009-05-16 11:51:14 +01:00 committed by Russell King
parent 49613d4d9a
commit a8cbcd92bd
5 changed files with 56 additions and 32 deletions
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7
arch/arm/Kconfig
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@ -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

10
arch/arm/include/asm/smp_scu.h
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@ -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

1
arch/arm/kernel/Makefile
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@ -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

41
arch/arm/kernel/smp_scu.c Normal file
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@ -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);
}

29
arch/arm/mach-realview/platsmp.c
View File

@ -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();
}
}