arch/arc/include/asm/cache.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   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
   9 #ifndef __ARC_ASM_CACHE_H
  10 #define __ARC_ASM_CACHE_H
  11
  12 /* In case $$ not config, setup a dummy number for rest of kernel */
  13 #ifndef CONFIG_ARC_CACHE_LINE_SHIFT
  14 #define L1_CACHE_SHIFT          6
  15 #else
  16 #define L1_CACHE_SHIFT          CONFIG_ARC_CACHE_LINE_SHIFT
  17 #endif
  18
  19 #define L1_CACHE_BYTES          (1 << L1_CACHE_SHIFT)
  20
  21 #define ARC_ICACHE_WAYS 2
  22 #define ARC_DCACHE_WAYS 4
  23
  24 /* Helpers */
  25 #define ARC_ICACHE_LINE_LEN     L1_CACHE_BYTES
  26 #define ARC_DCACHE_LINE_LEN     L1_CACHE_BYTES
  27
  28 #define ICACHE_LINE_MASK        (~(ARC_ICACHE_LINE_LEN - 1))
  29 #define DCACHE_LINE_MASK        (~(ARC_DCACHE_LINE_LEN - 1))
  30
  31 #if ARC_ICACHE_LINE_LEN != ARC_DCACHE_LINE_LEN
  32 #error "Need to fix some code as I/D cache lines not same"
  33 #else
  34 #define is_not_cache_aligned(p) ((unsigned long)p & (~DCACHE_LINE_MASK))
  35 #endif
  36
  37 /*
  38  * ARC700 doesn't cache any access in top 256M.
  39  * Ideal for wiring memory mapped peripherals as we don't need to do
  40  * explicit uncached accesses (LD.di/ST.di) hence more portable drivers
  41  */
  42 #define ARC_UNCACHED_ADDR_SPACE 0xc0000000
  43
  44 #ifndef __ASSEMBLY__
  45
  46 /* Uncached access macros */
  47 #define arc_read_uncached_32(ptr)       \
  48 ({                                      \
  49         unsigned int __ret;             \
  50         __asm__ __volatile__(           \
  51         "       ld.di %0, [%1]  \n"     \
  52         : "=r"(__ret)                   \
  53         : "r"(ptr));                    \
  54         __ret;                          \
  55 })
  56
  57 #define arc_write_uncached_32(ptr, data)\
  58 ({                                      \
  59         __asm__ __volatile__(           \
  60         "       st.di %0, [%1]  \n"     \
  61         :                               \
  62         : "r"(data), "r"(ptr));         \
  63 })
  64
  65 #define ARCH_DMA_MINALIGN      L1_CACHE_BYTES
  66
  67 extern void arc_cache_init(void);
  68 extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
  69 extern void __init read_decode_cache_bcr(void);
  70
  71 #endif  /* !__ASSEMBLY__ */
  72
  73 #endif /* _ASM_CACHE_H */