arch/arm64/include/asm/cputype.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_CPUTYPE_H
  17 #define __ASM_CPUTYPE_H
  18
  19 #define INVALID_HWID            ULONG_MAX
  20
  21 #define MPIDR_HWID_BITMASK      0xff00ffffff
  22
  23 #define MPIDR_LEVEL_BITS_SHIFT  3
  24 #define MPIDR_LEVEL_BITS        (1 << MPIDR_LEVEL_BITS_SHIFT)
  25 #define MPIDR_LEVEL_MASK        ((1 << MPIDR_LEVEL_BITS) - 1)
  26
  27 #define MPIDR_LEVEL_SHIFT(level) \
  28         (((1 << level) >> 1) << MPIDR_LEVEL_BITS_SHIFT)
  29
  30 #define MPIDR_AFFINITY_LEVEL(mpidr, level) \
  31         ((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK)
  32
  33 #define read_cpuid(reg) ({                                              \
  34         u64 __val;                                                      \
  35         asm("mrs        %0, " #reg : "=r" (__val));                     \
  36         __val;                                                          \
  37 })
  38
  39 #define ARM_CPU_IMP_ARM         0x41
  40 #define ARM_CPU_IMP_APM         0x50
  41
  42 #define ARM_CPU_PART_AEM_V8     0xD0F0
  43 #define ARM_CPU_PART_FOUNDATION 0xD000
  44 #define ARM_CPU_PART_CORTEX_A53 0xD030
  45 #define ARM_CPU_PART_CORTEX_A57 0xD070
  46
  47 #define APM_CPU_PART_POTENZA    0x0000
  48
  49 #ifndef __ASSEMBLY__
  50
  51 /*
  52  * The CPU ID never changes at run time, so we might as well tell the
  53  * compiler that it's constant.  Use this function to read the CPU ID
  54  * rather than directly reading processor_id or read_cpuid() directly.
  55  */
  56 static inline u32 __attribute_const__ read_cpuid_id(void)
  57 {
  58         return read_cpuid(MIDR_EL1);
  59 }
  60
  61 static inline u64 __attribute_const__ read_cpuid_mpidr(void)
  62 {
  63         return read_cpuid(MPIDR_EL1);
  64 }
  65
  66 static inline unsigned int __attribute_const__ read_cpuid_implementor(void)
  67 {
  68         return (read_cpuid_id() & 0xFF000000) >> 24;
  69 }
  70
  71 static inline unsigned int __attribute_const__ read_cpuid_part_number(void)
  72 {
  73         return (read_cpuid_id() & 0xFFF0);
  74 }
  75
  76 static inline u32 __attribute_const__ read_cpuid_cachetype(void)
  77 {
  78         return read_cpuid(CTR_EL0);
  79 }
  80
  81 #endif /* __ASSEMBLY__ */
  82
  83 #endif