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>
16 #include <asm/cputype.h>
19 #define SCU_CONFIG 0x04
20 #define SCU_CPU_STATUS 0x08
21 #define SCU_INVALIDATE 0x0c
22 #define SCU_FPGA_REVISION 0x10
25 * Get the number of CPU cores from the SCU configuration
27 unsigned int __init scu_get_core_count(void __iomem *scu_base)
29 unsigned int ncores = __raw_readl(scu_base + SCU_CONFIG);
30 return (ncores & 0x03) + 1;
36 void __init scu_enable(void __iomem *scu_base)
40 #ifdef CONFIG_ARM_ERRATA_764369
42 if ((read_cpuid(CPUID_ID) & 0xff0ffff0) == 0x410fc090) {
43 scu_ctrl = __raw_readl(scu_base + 0x30);
45 __raw_writel(scu_ctrl | 0x1, scu_base + 0x30);
49 scu_ctrl = __raw_readl(scu_base + SCU_CTRL);
50 /* already enabled? */
55 __raw_writel(scu_ctrl, scu_base + SCU_CTRL);
58 * Ensure that the data accessed by CPU0 before the SCU was
59 * initialised is visible to the other CPUs.