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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/arm/kernel/smp_scu.c
2 * linux/arch/arm/kernel/smp_scu.c
4 * Copyright (C) 2002 ARM Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/init.h>
14 #include <asm/smp_scu.h>
15 #include <asm/cacheflush.h>
18 #define SCU_CONFIG 0x04
19 #define SCU_CPU_STATUS 0x08
20 #define SCU_INVALIDATE 0x0c
21 #define SCU_FPGA_REVISION 0x10
24 * Get the number of CPU cores from the SCU configuration
26 unsigned int __init
scu_get_core_count(void __iomem
*scu_base
)
28 unsigned int ncores
= __raw_readl(scu_base
+ SCU_CONFIG
);
29 return (ncores
& 0x03) + 1;
35 void __init
scu_enable(void __iomem
*scu_base
)
39 scu_ctrl
= __raw_readl(scu_base
+ SCU_CTRL
);
40 /* already enabled? */
45 __raw_writel(scu_ctrl
, scu_base
+ SCU_CTRL
);
48 * Ensure that the data accessed by CPU0 before the SCU was
49 * initialised is visible to the other CPUs.