1 /* 2 * linux/arch/arm/kernel/smp_scu.c 3 * 4 * Copyright (C) 2002 ARM Ltd. 5 * All Rights Reserved 6 * 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. 10 */ 11 #include <linux/init.h> 12 #include <linux/io.h> 13 14 #include <asm/smp_scu.h> 15 #include <asm/cacheflush.h> 16 17 #define SCU_CTRL 0x00 18 #define SCU_CONFIG 0x04 19 #define SCU_CPU_STATUS 0x08 20 #define SCU_INVALIDATE 0x0c 21 #define SCU_FPGA_REVISION 0x10 22 23 /* 24 * Get the number of CPU cores from the SCU configuration 25 */ 26 unsigned int __init scu_get_core_count(void __iomem *scu_base) 27 { 28 unsigned int ncores = __raw_readl(scu_base + SCU_CONFIG); 29 return (ncores & 0x03) + 1; 30 } 31 32 /* 33 * Enable the SCU 34 */ 35 void __init scu_enable(void __iomem *scu_base) 36 { 37 u32 scu_ctrl; 38 39 scu_ctrl = __raw_readl(scu_base + SCU_CTRL); 40 scu_ctrl |= 1; 41 __raw_writel(scu_ctrl, scu_base + SCU_CTRL); 42 43 /* 44 * Ensure that the data accessed by CPU0 before the SCU was 45 * initialised is visible to the other CPUs. 46 */ 47 flush_cache_all(); 48 } 49