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 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
  38 static 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
  52 static inline void ixp4xx_write_feature_bits(u32 value)
  53 {
  54         *IXP4XX_EXP_CFG2 = ~value;
  55 }
  56
  57 #endif  /* _ASM_ARCH_CPU_H */