c18f65816e
Adds functions to read and write IXP4xx "feature" (aka "fuse") bits, containing information about available/enabled CPU features. The uncompress.h included by boot/compressed/misc.c resides in a different space than rest of the kernel and thus can't use asm/hardware.h (including asm/arch/cpu.h - which, in turn, may use EXPORTed symbol "processor_id"). Posted to linux-arm-kernel on 2 Dec 2007 and revised. Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* include/asm-arm/arch-ixp4xx/cpu.h
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*
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* IXP4XX cpu type detection
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*
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* Copyright (C) 2007 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __ASM_ARCH_CPU_H__
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#define __ASM_ARCH_CPU_H__
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extern unsigned int processor_id;
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/* Processor id value in CP15 Register 0 */
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#define IXP425_PROCESSOR_ID_VALUE 0x690541c0
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#define IXP435_PROCESSOR_ID_VALUE 0x69054040
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#define IXP465_PROCESSOR_ID_VALUE 0x69054200
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#define IXP4XX_PROCESSOR_ID_MASK 0xfffffff0
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#define cpu_is_ixp42x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
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IXP425_PROCESSOR_ID_VALUE)
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#define cpu_is_ixp43x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
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IXP435_PROCESSOR_ID_VALUE)
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#define cpu_is_ixp46x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
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IXP465_PROCESSOR_ID_VALUE)
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static inline u32 ixp4xx_read_feature_bits(void)
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{
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unsigned int val = ~*IXP4XX_EXP_CFG2;
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val &= ~IXP4XX_FEATURE_RESERVED;
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if (!cpu_is_ixp46x())
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val &= ~IXP4XX_FEATURE_IXP46X_ONLY;
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return val;
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}
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static inline void ixp4xx_write_feature_bits(u32 value)
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{
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*IXP4XX_EXP_CFG2 = ~value;
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}
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#endif /* _ASM_ARCH_CPU_H */
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