linux/include/asm-arm/arch-ixp4xx/cpu.h
Krzysztof Halasa c18f65816e [ARM] 4712/2: Adds functions to read and write IXP4xx "feature" bits
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>
2008-02-04 13:15:25 +00:00

47 lines
1.2 KiB
C

/*
* include/asm-arm/arch-ixp4xx/cpu.h
*
* IXP4XX cpu type detection
*
* Copyright (C) 2007 MontaVista Software, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef __ASM_ARCH_CPU_H__
#define __ASM_ARCH_CPU_H__
extern unsigned int processor_id;
/* Processor id value in CP15 Register 0 */
#define IXP425_PROCESSOR_ID_VALUE 0x690541c0
#define IXP435_PROCESSOR_ID_VALUE 0x69054040
#define IXP465_PROCESSOR_ID_VALUE 0x69054200
#define IXP4XX_PROCESSOR_ID_MASK 0xfffffff0
#define cpu_is_ixp42x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
IXP425_PROCESSOR_ID_VALUE)
#define cpu_is_ixp43x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
IXP435_PROCESSOR_ID_VALUE)
#define cpu_is_ixp46x() ((processor_id & IXP4XX_PROCESSOR_ID_MASK) == \
IXP465_PROCESSOR_ID_VALUE)
static inline u32 ixp4xx_read_feature_bits(void)
{
unsigned int val = ~*IXP4XX_EXP_CFG2;
val &= ~IXP4XX_FEATURE_RESERVED;
if (!cpu_is_ixp46x())
val &= ~IXP4XX_FEATURE_IXP46X_ONLY;
return val;
}
static inline void ixp4xx_write_feature_bits(u32 value)
{
*IXP4XX_EXP_CFG2 = ~value;
}
#endif /* _ASM_ARCH_CPU_H */