arch/mips/include/asm/mach-cavium-octeon/cpu-feature-overrides.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2004 Cavium Networks
   7  */
   8 #ifndef __ASM_MACH_CAVIUM_OCTEON_CPU_FEATURE_OVERRIDES_H
   9 #define __ASM_MACH_CAVIUM_OCTEON_CPU_FEATURE_OVERRIDES_H
  10
  11 #include <linux/types.h>
  12 #include <asm/mipsregs.h>
  13
  14 /*
  15  * Cavium Octeons are MIPS64v2 processors
  16  */
  17 #define cpu_dcache_line_size()  128
  18 #define cpu_icache_line_size()  128
  19
  20
  21 #define cpu_has_4kex            1
  22 #define cpu_has_3k_cache        0
  23 #define cpu_has_4k_cache        0
  24 #define cpu_has_tx39_cache      0
  25 #define cpu_has_fpu             0
  26 #define cpu_has_counter         1
  27 #define cpu_has_watch           1
  28 #define cpu_has_divec           1
  29 #define cpu_has_vce             0
  30 #define cpu_has_cache_cdex_p    0
  31 #define cpu_has_cache_cdex_s    0
  32 #define cpu_has_prefetch        1
  33
  34 #define cpu_has_llsc            1
  35 /*
  36  * We Disable LL/SC on non SMP systems as it is faster to disable
  37  * interrupts for atomic access than a LL/SC.
  38  */
  39 #ifdef CONFIG_SMP
  40 # define kernel_uses_llsc       1
  41 #else
  42 # define kernel_uses_llsc       0
  43 #endif
  44 #define cpu_has_vtag_icache     1
  45 #define cpu_has_dc_aliases      0
  46 #define cpu_has_ic_fills_f_dc   0
  47 #define cpu_has_64bits          1
  48 #define cpu_has_octeon_cache    1
  49 #define cpu_has_saa             octeon_has_saa()
  50 #define cpu_has_mips32r1        0
  51 #define cpu_has_mips32r2        0
  52 #define cpu_has_mips64r1        0
  53 #define cpu_has_mips64r2        1
  54 #define cpu_has_mips_r2_exec_hazard 0
  55 #define cpu_has_dsp             0
  56 #define cpu_has_mipsmt          0
  57 #define cpu_has_vint            0
  58 #define cpu_has_veic            0
  59 #define cpu_hwrena_impl_bits    0xc0000000
  60
  61 #define kernel_uses_smartmips_rixi (cpu_data[0].cputype != CPU_CAVIUM_OCTEON)
  62
  63 #define ARCH_HAS_IRQ_PER_CPU    1
  64 #define ARCH_HAS_SPINLOCK_PREFETCH 1
  65 #define spin_lock_prefetch(x) prefetch(x)
  66 #define PREFETCH_STRIDE 128
  67
  68 #ifdef __OCTEON__
  69 /*
  70  * All gcc versions that have OCTEON support define __OCTEON__ and have the
  71  *  __builtin_popcount support.
  72  */
  73 #define ARCH_HAS_USABLE_BUILTIN_POPCOUNT 1
  74 #endif
  75
  76 static inline int octeon_has_saa(void)
  77 {
  78         int id;
  79         asm volatile ("mfc0 %0, $15,0" : "=r" (id));
  80         return id >= 0x000d0300;
  81 }
  82
  83 /*
  84  * The last 256MB are reserved for device to device mappings and the
  85  * BAR1 hole.
  86  */
  87 #define MAX_DMA32_PFN (((1ULL << 32) - (1ULL << 28)) >> PAGE_SHIFT)
  88
  89 #endif