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 #define CACHE_LINE_MASK         (~(L1_CACHE_BYTES - 1))
  21
  22 /*
  23  * ARC700 doesn't cache any access in top 256M.
  24  * Ideal for wiring memory mapped peripherals as we don't need to do
  25  * explicit uncached accesses (LD.di/ST.di) hence more portable drivers
  26  */
  27 #define ARC_UNCACHED_ADDR_SPACE 0xc0000000
  28
  29 #ifndef __ASSEMBLY__
  30
  31 /* Uncached access macros */
  32 #define arc_read_uncached_32(ptr)       \
  33 ({                                      \
  34         unsigned int __ret;             \
  35         __asm__ __volatile__(           \
  36         "       ld.di %0, [%1]  \n"     \
  37         : "=r"(__ret)                   \
  38         : "r"(ptr));                    \
  39         __ret;                          \
  40 })
  41
  42 #define arc_write_uncached_32(ptr, data)\
  43 ({                                      \
  44         __asm__ __volatile__(           \
  45         "       st.di %0, [%1]  \n"     \
  46         :                               \
  47         : "r"(data), "r"(ptr));         \
  48 })
  49
  50 #define ARCH_DMA_MINALIGN      L1_CACHE_BYTES
  51
  52 extern void arc_cache_init(void);
  53 extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
  54 extern void read_decode_cache_bcr(void);
  55
  56 #endif  /* !__ASSEMBLY__ */
  57
  58 #endif /* _ASM_CACHE_H */