kernel/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 <linux/io.h>
  18 #include <asm/cputype.h>
  19
  20 /* Processor id value in CP15 Register 0 */
  21 #define IXP42X_PROCESSOR_ID_VALUE       0x690541c0 /* including unused 0x690541Ex */
  22 #define IXP42X_PROCESSOR_ID_MASK        0xffffffc0
  23
  24 #define IXP43X_PROCESSOR_ID_VALUE       0x69054040
  25 #define IXP43X_PROCESSOR_ID_MASK        0xfffffff0
  26
  27 #define IXP46X_PROCESSOR_ID_VALUE       0x69054200 /* including IXP455 */
  28 #define IXP46X_PROCESSOR_ID_MASK        0xfffffff0
  29
  30 #define cpu_is_ixp42x_rev_a0() ((read_cpuid_id() & (IXP42X_PROCESSOR_ID_MASK | 0xF)) == \
  31                                 IXP42X_PROCESSOR_ID_VALUE)
  32 #define cpu_is_ixp42x() ((read_cpuid_id() & IXP42X_PROCESSOR_ID_MASK) == \
  33                          IXP42X_PROCESSOR_ID_VALUE)
  34 #define cpu_is_ixp43x() ((read_cpuid_id() & IXP43X_PROCESSOR_ID_MASK) == \
  35                          IXP43X_PROCESSOR_ID_VALUE)
  36 #define cpu_is_ixp46x() ((read_cpuid_id() & IXP46X_PROCESSOR_ID_MASK) == \
  37                          IXP46X_PROCESSOR_ID_VALUE)
  38
  39 static inline u32 ixp4xx_read_feature_bits(void)
  40 {
  41         u32 val = ~__raw_readl(IXP4XX_EXP_CFG2);
  42
  43         if (cpu_is_ixp42x_rev_a0())
  44                 return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP |
  45                                                IXP4XX_FEATURE_AES);
  46         if (cpu_is_ixp42x())
  47                 return val & IXP42X_FEATURE_MASK;
  48         if (cpu_is_ixp43x())
  49                 return val & IXP43X_FEATURE_MASK;
  50         return val & IXP46X_FEATURE_MASK;
  51 }
  52
  53 static inline void ixp4xx_write_feature_bits(u32 value)
  54 {
  55         __raw_writel(~value, IXP4XX_EXP_CFG2);
  56 }
  57
  58 #endif  /* _ASM_ARCH_CPU_H */