arch/arm/mach-ixp4xx/include/mach/cpu.h

   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 IXP425_PROCESSOR_ID_VALUE       0x690541c0
  21 #define IXP435_PROCESSOR_ID_VALUE       0x69054040
  22 #define IXP465_PROCESSOR_ID_VALUE       0x69054200
  23 #define IXP4XX_PROCESSOR_ID_MASK        0xfffffff0
  24
  25 #define cpu_is_ixp42x() ((read_cpuid_id() & IXP4XX_PROCESSOR_ID_MASK) == \
  26                           IXP425_PROCESSOR_ID_VALUE)
  27 #define cpu_is_ixp43x() ((read_cpuid_id() & IXP4XX_PROCESSOR_ID_MASK) == \
  28                           IXP435_PROCESSOR_ID_VALUE)
  29 #define cpu_is_ixp46x() ((read_cpuid_id() & IXP4XX_PROCESSOR_ID_MASK) == \
  30                           IXP465_PROCESSOR_ID_VALUE)
  31
  32 static inline u32 ixp4xx_read_feature_bits(void)
  33 {
  34         unsigned int val = ~*IXP4XX_EXP_CFG2;
  35         val &= ~IXP4XX_FEATURE_RESERVED;
  36         if (!cpu_is_ixp46x())
  37                 val &= ~IXP4XX_FEATURE_IXP46X_ONLY;
  38
  39         return val;
  40 }
  41
  42 static inline void ixp4xx_write_feature_bits(u32 value)
  43 {
  44         *IXP4XX_EXP_CFG2 = ~value;
  45 }
  46
  47 #endif  /* _ASM_ARCH_CPU_H */