1/* 2 * arch/arm/mach-ixp4xx/include/mach/cpu.h 3 * 4 * IXP4XX cpu type detection 5 * 6 * Copyright (C) 2007 MontaVista Software, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 */ 13 14#ifndef __ASM_ARCH_CPU_H__ 15#define __ASM_ARCH_CPU_H__ 16 17#include <asm/cputype.h> 18 19/* Processor id value in CP15 Register 0 */ 20#define IXP42X_PROCESSOR_ID_VALUE 0x690541c0 /* including unused 0x690541Ex */ 21#define IXP42X_PROCESSOR_ID_MASK 0xffffffc0 22 23#define IXP43X_PROCESSOR_ID_VALUE 0x69054040 24#define IXP43X_PROCESSOR_ID_MASK 0xfffffff0 25 26#define IXP46X_PROCESSOR_ID_VALUE 0x69054200 /* including IXP455 */ 27#define IXP46X_PROCESSOR_ID_MASK 0xfffffff0 28 29#define cpu_is_ixp42x_rev_a0() ((read_cpuid_id() & (IXP42X_PROCESSOR_ID_MASK | 0xF)) == \ 30 IXP42X_PROCESSOR_ID_VALUE) 31#define cpu_is_ixp42x() ((read_cpuid_id() & IXP42X_PROCESSOR_ID_MASK) == \ 32 IXP42X_PROCESSOR_ID_VALUE) 33#define cpu_is_ixp43x() ((read_cpuid_id() & IXP43X_PROCESSOR_ID_MASK) == \ 34 IXP43X_PROCESSOR_ID_VALUE) 35#define cpu_is_ixp46x() ((read_cpuid_id() & IXP46X_PROCESSOR_ID_MASK) == \ 36 IXP46X_PROCESSOR_ID_VALUE) 37 38static inline u32 ixp4xx_read_feature_bits(void) 39{ 40 u32 val = ~*IXP4XX_EXP_CFG2; 41 42 if (cpu_is_ixp42x_rev_a0()) 43 return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP | 44 IXP4XX_FEATURE_AES); 45 if (cpu_is_ixp42x()) 46 return val & IXP42X_FEATURE_MASK; 47 if (cpu_is_ixp43x()) 48 return val & IXP43X_FEATURE_MASK; 49 return val & IXP46X_FEATURE_MASK; 50} 51 52static inline void ixp4xx_write_feature_bits(u32 value) 53{ 54 *IXP4XX_EXP_CFG2 = ~value; 55} 56 57#endif /* _ASM_ARCH_CPU_H */ 58